GUANGZHOU BAIYUN TECHNOLOGY CO., LTD. Company News

      The outer protection structure of modern buildings generally no longer uses traditional brick walls and block bricks, but uses architectural curtain walls. Building curtain walls include glass curtain walls, stone curtain walls, aluminum curtain walls, ceramic board curtain walls, clay board curtain walls, metal board curtain walls, fiber cement board curtain walls and other board curtain walls. Building curtain walls have many advantages such as beautiful appearance, energy saving, and easy maintenance. The joints between the panels need to be sealed with silicone weathering sealants. Silicone weathering sealant needs to withstand the displacement of the joint width caused by the external environment (thermal expansion and contraction of the plate material, displacement of the main structure, etc.) caused by the external environment of the building joint during the application process. This requires the silicone weather-resistant sealant to have a good ability to withstand joint displacement, and to withstand long-term joint width changes without cracking. The displacement ability of silicone weathering sealant is generally 20, 25, 35, 50, 100/-50, etc. For example, level 35 is able to withstand changes in the width of the sealant gap between ±35%. When the silicone weathering sealant is directly exposed outdoors, it must be able to ensure the air-tightness and water-tightness of the curtain wall for a long time. It has very high requirements for its key technical indicators such as elasticity (displacement capacity) and aging resistance.     In the context of the current price increase of raw materials, a considerable number of oil-extended silicone weather-resistant sealant products have appeared on the market, attracting users at low prices. After 5000 hours of UV aging and 70°C, 14 days of heat aging, the oil-extended sealant exhibits a decrease in elasticity and an increase in hardness. The performance decline is very obvious. It cannot meet the corresponding standard requirements of sealants and will directly cause serious quality problems and even safety to users. Hidden danger!     In today's article, we will give you a detailed introduction to the hazards of oil-extended silicone weathering sealants, and share the "film method" of identifying oil-extended adhesives and the performance of oil-extended silicone weathering sealants on the film. 1. The harm of oil-filled silicone weatherproofing sealant     The oil-filling of silicone weather-resistant sealant will cause cracking, chalking, hardening, and oil flow problems of the weather-resistant sealant, leading to premature failure of the sealant, resulting in water leakage and air leakage in the curtain wall, increased energy consumption, and affecting normal use. The oil-filled silicone weather-resistant sealant appears cracking, hardening, or even chalking, which will harm the curtain wall, as shown in the figure below. figure 1 Cracking and hardening of oil-filled weather-resistant adhesive on aluminum curtain wall of a building                                                     figure 2 Cracking and hardening of oil-filled weather-resistant adhesive on aluminum curtain wall of a building     Oil-filled silicone weather-resistant sealant can also cause penetration pollution to stone and aluminum plates. This kind of pollution is different from vertical flow pollution, it is irreversible and cannot be removed by cleaning. figure 3 Stone curtain wall pollution caused by oil-filled silicone weathering sealant in a building                                                         figure 4 A building's aluminum curtain wall pollution caused by oil-filled silicone weather-resistant sealant     When the oil-filled silicone weather-resistant sealant is in contact with the insulating glass for a long time, the filled industrial white oil will gradually migrate and penetrate into the insulating glass, causing a sealing butyl sealant of the insulating glass to be dissolved and the phenomenon of oil flow and rainbow will appear, destroying the original insulating glass. Some functions such as energy saving, heat preservation, light transmission and heat insulation. figure 5 Cracking of oil-filled silicone weather-resistant sealant and oil flow and rainbow phenomenon in insulating glass Identification method of oil-extended sealant 2.21 Thin film method The film method is to apply sealant on the PE plastic film (with a thickness of 10-12 silk is more appropriate), and observe whether the surface of the film is flat. If the plastic film is not flat, the probability of adding mineral oil is very high. The sealant that has been applied and cured can also be qualitatively identified by this method within a period of time after the sealant is applied. （1） For the unopened sealant, hit it on a flat plastic film into a "mouth" shape, and scrape it evenly to the thickness of about 1-3mm, and observe the flatness of the film after 24 hours.               figure 6 Film test comparison between oil-filled (left) and non-oil-filled sealant (right)     Looking at the results the next day, the surface of the film on the left is not flat, and the probability of adding mineral oil to the sealant in contact with it is very high. On the contrary, the film on the right side remains flat, and the sealant in contact with it is not filled with oil. The more oil-filled, the more obvious the film shrinks.     Collected 6 different brands of silicone weather-resistant sealant samples from the market, and tested them with the film method. It was found that 3 brands of sealant samples could cause film shrinkage, and the detection rate was as high as 50%, as shown in the figure below: Figure 7 A certain brand of white silicone weather-resistant sealant                                             figure 8 A certain brand of black silicone weather-resistant sealant     When testing with the film method, it is found that when the plastic film shrinks and wrinkles, the probability of filling with mineral oil is very high. If further confirmation is required, it can be sent to the corresponding testing agency to use the national standard testing method for further identification.     Through sample collection and testing, the author found that some silicone sealant manufacturers on the market have adopted extremely irresponsible practices by mixing weather-resistant sealants with a considerable amount of cheap mineral oil instead of expensive organic silicon raw materials. To achieve the purpose of reducing production costs and obtaining market price advantages, it does not consider the serious quality problems and safety hazards caused by the decline in product quality. The user must be careful to identify during the selection process, and do not use these oil-extended sealants to cause losses.  

What is the performance of glass curtain wall sealant after 25 years? How many years can curtain wall sealant be used safely?     BAIYUN responds with practical actions, and takes the lead in pioneering the industry in the research of natural exposure and aging. As early as 1997, a 50-year-old glass curtain wall was built in the company square, and the aging resistance performance data of the curtain wall sealant was regularly obtained from it. The glass curtain wall sealant is made of Baiyun brand SS621 silicone structural sealant and SS611 silicone weather-resistant sealant. It has passed the three-property test with a safety inspection wind pressure of 6000Pa taken by the Guangdong Provincial Construction Engineering Quality and Safety Supervision and Inspection Station, reaching the national first-class level. . Up to now, the curtain wall has been exposed to the natural environment for 25 years (1997-2022).     So, 25 years later, what is the performance of this glass curtain wall sealant? Recently, BAIYUN commissioned a third-party testing agency to select a unit panel for the curtain wall to conduct systematic testing. Next, let us take a closer look at the process of dismantling, sampling, testing and installation of this 25-year-old curtain wall: 01 Select a single unit and cut the weather-resistant sealant around the glass panel 02 Remove the fastening screws and pressing blocks of the attached frame and the main beam, and remove the assembly of the glass and the sub-frame. 03 Cut 5 pieces of 5cm long attached frames for pull test. 04 Cut a 50cm length of structural sealant as a sample for the rebonding method. 05 Bond the attachment frame back to the glass with epoxy glue, structural sealant, and U-shaped aluminum strips. 06 Install the glass and sub-frame assembly back on the curtain wall, and apply weather-resistant sealant around it. 07 Keep records and labels.     During the test of the existing curtain wall sealant, the re-bonding method and the pull-out test method were adopted for the silicone structural sealant, and the maximum strength was obtained through the two test methods, which can be used to comprehensively evaluate the performance of the structural sealant; For the silicone weather-resistant sealant, the Shore hardness test method and the hand-pulled 100% elastic recovery rate peel test were adopted to evaluate the performance of the weather-resistant sealant. Final test result: After 25 years of natural aging, the performance of Baiyun Chemical Curtain Wall Sealant can still fully meet the requirements of relevant national standards.

Application of polyurethane potting sealant in PCB industry     With the development of industry, the application of electronic components is more and more extensive. At the same time, the application of potting compounds, which play a key role in protecting electronic components, is becoming more and more common. Potting sealant can be found in various industries such as automotive electronics, military aviation, medical equipment, household appliances, power supplies, and new energy.     Due to the existence of a large amount of moisture, oxygen, dust and mold in the external environment, electronic components exposed to air or some special acid-base environments for a long time are prone to oxidation and corrosion. Potting sealant can largely isolate the influence of the external environment on electronic circuits, thereby greatly extending the service life of electronic components.     From the application side, the potting compound usually used for electronic components needs to have single or multiple functions such as sealing, potting, bonding, coating, and heat dissipation. There are many types of potting adhesives on the market. The mainstream products are mainly silicone potting adhesives, polyurethane potting adhesives, epoxy potting adhesives, UV potting adhesives, etc. The potting adhesives of different materials have different characteristics and uses. In this issue, let us delve into the "rules of use" of one of the most widely used potting compounds, polyurethane potting compounds. Features of Polyurethane Encapsulant     Polyurethane encapsulant is a two-component AB sealant consisting of a curing agent or prepolymer with isocyanate groups, a hydroxyl polyol or prepolymer containing active hydrogen, and some functional additives and fillers. The mass ratio is usually 1-5:1. Since the molecular structure of the polyurethane itself contains both flexible and rigid segments, it can be adjusted in a wide range, so the hardness of the polyurethane potting compound can be as low as 5 Shore A, or as high as 70-80 Shore D. At the same time, the corresponding bulk tensile strength can be in the range of 0.5-15.0 MPa. The mechanical properties of polyurethane encapsulant are between silicone and epoxy, with moderate hardness, excellent waterproof performance and electrical insulation.     In addition, the temperature range of polyurethane encapsulant is generally between -60 ℃ to 120 ℃, the high temperature resistance is not as good as that of silicone and epoxy, and the low temperature resistance is comparable to that of silicone, which is better than epoxy. Polyurethane potting adhesives have outstanding bonding properties and have good bonding effects on most substrates. Its bonding strength is higher than that of silicone, and it is not as strong as epoxy sealant and not easy to rework. Therefore, polyurethane encapsulants can be given priority to applications where adhesive performance is the main requirement. However, polyurethane encapsulant also has the disadvantage of excessive air bubbles. It is easy to generate bubbles during the two-component mixing process. Unlike silicone oil, which has a defoaming function, its own viscosity causes the bubbles to rise to the surface for a long time. Especially, the high-viscosity polyurethane encapsulant needs to be vacuumed to achieve defoaming. Points for attention in the use of polyurethane potting sealant     Due to the composition of the polyurethane potting compound, the isocyanate group in the curing agent is easily reacted with water vapor to generate CO2, so that gas remains in the colloid after curing. Bake to remove moisture. When mixing, it should be fully mixed according to the proportion recommended in the product specification. Otherwise, too many curing agent components will cause excess isocyanate groups to react with the infiltrated water vapor and generate CO2 gas, making the cured There are bubbles in the colloid, and if the curing agent component is too small, there will be insufficient curing or even no curing.     It should also be noted that once the packaging material is opened, it is recommended that users use it up at one time or as soon as possible. Because the main agent is easy to absorb water, and the curing agent is easy to form skin after contact with water, both of which will cause problems such as foaming or adhesion and deterioration of waterproof performance of the cured adhesive.     BAIYUN, who has been deeply involved in the sealant industry for 37 years, has developed high-quality two-component polyurethane products in the fields of power batteries, automobiles, electronic appliances, lighting, rail transit, etc. Adhesive solutions offer infinite possibilities for every customer who pursues perfection.     At present, the precision of industrial manufacturing is constantly improving, and the performance requirements of adhesives in the industrial field are also getting higher and higher. BAIYUN will continue to develop and innovate in the field of polyurethane adhesives, assisting the high-quality development of Chinese manufacturing, and empowering beauty!

    After 51 days and nights of hard work, the Central Aid Hong Kong Emergency Hospital and the Lok Ma Chau shelter facility have been fully completed recently, and the completion and delivery ceremony was officially held.     More than 20,000 people fought day and night, turning a deserted beach into a "Continent of Life"!         China's infrastructure has once again exerted its strength and created a new miracle again. This miracle belongs to every sweaty builder, every hard-working engineer, and, of course, every enterprise who has given his best during this period...     As a leading company in the domestic sealant industry, BAIYUN has participated in the construction of the Central Aided Hong Kong Emergency Hospital and Lok Ma Chau shelter facilities, and has worked hand in hand with various enterprises to provide mature and professional solutions for more than 90% of the project's bonding and sealing needs. , meticulous solutions, and make every effort to ensure the completion of the project on time.     When the project was completed, BAIYUN received letters of thanks from various cooperative enterprises.         The aided construction project located in the Lok Ma Chau Loop area of Hong Kong includes three parts: the Central Aid Hong Kong Emergency Hospital, the Central Aid Hong Kong Lok Ma Chau Shelter Facility, and Living Supporting Facilities, with a total land area of about 500,000 square meters and a total construction area of about 283,100 square meters Meter.     The Central Aid Hong Kong Emergency Hospital is a respiratory infectious disease specialist hospital approved by the Party Central Committee at the request of the Hong Kong Special Administrative Region Government. It can provide 1,000 negative pressure beds (including 100 ICU beds), 3 operating rooms and a radiology department. Laboratory, central supply room, blood transfusion and other medical and technical facilities, as well as supporting facilities such as drug storehouse, air compressor room, oxygen station, washing workshop, temporary garbage storage room, negative pressure traction pump room, and sewage treatment station.     The central aided Hong Kong Lok Ma Chau shelter isolation facility has a construction area of 112,100 square meters, can provide 10,056 beds, and includes an admission building, a discharge building, a sanitary passage area, an inspection center and CT room, a warehouse and a pharmacy, and a sub-control center convergence computer room , medical waste station, sewage treatment station and other supporting facilities.     The construction of the Central Aid Hong Kong Emergency Hospital started on March 6, 2022, and was completed and accepted on April 20. The construction of the Lok Ma Chau shelter facility started on March 22 and was completed and accepted on April 25. The two projects lasted 51 days, once again demonstrating the strong strength of China's infrastructure.     Previously, BAIYUN assisted in the construction of additional isolation facilities in Hong Kong Penny's Bay, Hong Kong Kai Tak additional isolation facilities, Shenzhen Baguang Isolation Hotel, Shenzhen Changda International Hotel (Shajing Street New Coronary Pneumonia Epidemic Prevention and Control Isolation Hotel) and Guangzhou International Health Station We have accumulated a lot of experience in epidemic prevention projects. During the construction of this project, BAIYUN gave full play to its technical advantages and speed advantages, measured the needs of the project immediately, and provided adhesive solutions for multi-field sealing systems including curtain walls, doors and windows, roofs, and interior decoration for the project construction. Program.     In response to the problems of many details and nodes, large volume, tight construction period, and heavy tasks in the project, BAIYUN communicated with the construction team many times to ensure smooth product transportation lines and ensure the orderly supply of products on the project at the first time. During the application period, with stable product quality and thoughtful whole-process service, BAIYUN brand products have passed the pre-construction adhesion test and compatibility test at one time. In the construction stage, one-time glue application is ensured, no rework is required, and the time is minimized. Run for life.

    Photovoltaic storage integration, as the name suggests, is the combination of photovoltaic power generation and energy storage battery parts. Compared with the original photovoltaic system, the addition of the energy storage system can store the redundant power of photovoltaic power generation during the day, and then discharge it through the energy storage system at night to reduce the influence of factors such as the duration of sunshine, and smooth the operation. The output of photovoltaic power is not only conducive to improving the utility rate and penetration rate of photovoltaics, promoting the rapid opening of the space for the energy storage business model on the new energy side, but also helping to reduce the power consumption of the power grid during the night peak period and maintain the stability of the entire power system. .     According to different application types, solar energy storage systems can be divided into photovoltaic off-grid energy storage systems, photovoltaic grid-connected energy storage systems, and photovoltaic off-grid energy storage systems. Photovoltaic off-grid energy storage system     Photovoltaic off-grid energy storage system converts solar energy into electrical energy to supply loads through photovoltaic modules, and stores excess energy in the energy storage system. The existence of the energy storage system improves the photovoltaic utilization rate. This type of system does not depend on the power grid and operates independently, forming a closed internal loop of the system, so it is mostly used in areas such as communication base stations and islands that are far away from the power grid and require self-sufficient power generation. Since the power generation cost of photovoltaic off-grid energy storage system is lower than the cost of fuel power generation, the application of this type of system is relatively common at present. Photovoltaic grid-connected energy storage system     The photovoltaic on-grid and off-grid energy storage system is an organic combination of the above two, but in any case, the solar energy storage system basically includes photovoltaic modules, batteries, inverters and other components. As its essential bonding and sealing material, sealant needs to provide excellent bonding and sealing solutions for special aluminum materials, tempered glass, TPT/TPE composite backing materials, junction box PPO, etc. in components. At the same time, since the designed service life of solar photovoltaic systems is generally more than 20 years, good corrosion resistance, weathering resistance, and high and low temperature resistance are also one of the indicators to measure the sealant for photovoltaic modules.   BAIYUN Photovoltaic Module Bonding and Sealing Solutions Main use: It can be used for bonding and sealing of photovoltaic module frame and junction box: Product features: excellent adhesive properties, good adhesion to aluminum, tempered glass, composite backing, junction box PPO materials; moisture resistance, shock resistance, corrosion resistance, yellowing resistance, low water vapor transmission rate. BAIYUN Double Glass Module Structural Bonding and Sealing Solution Main application: used for bonding and sealing of photovoltaic double-glass modules and photovoltaic curtain wall structures; Product features: It has excellent structural bonding performance and weathering resistance, and has excellent high and low temperature resistance. BAIYUN PV module junction box, inverter potting solution Main use: used for junction box, inverter potting protection; Product features: It has a wide range of bonding substrates, and has the characteristics of fast curing speed, easy flow, yellowing resistance, waterproof and moisture-proof, etc. It has excellent thermal conductivity and insulation performance, and its flame retardant performance reaches UL94V-0 level, which is in line with EU RoHS environmental protection standards. BAIYUN Photovoltaic Energy Storage Cell Structural Bonding Solution Main application: used for power battery cell structure bonding, aluminum honeycomb panel structure bonding. Product features: two-component polyurethane material, excellent bonding performance, suitable for bonding and fixing of various substrates, with fast curing speed, good thixotropy, high strength, waterproof and moisture-proof, etc. excellent electrical insulation, flame retardant performance V-0 grade, in line with RoHS and REACH environmental protection standards.     At present, the "dual carbon" plan has penetrated into all walks of life, and the medium and long-term goal of "carbon peaking and carbon neutrality" will surely accelerate the leap-forward development of renewable energy. High green energy is one of the most efficient and effective aids to realize the " dual carbon " plan. As a leading company in the sealant industry, BAIYUN has always adhered to the corporate mission of "Dedicated to provide the best products for people ", and has continuously provided more perfect system sealant solutions for optical storage integration and other fields.

    With the deepening of urbanization, outdoor lighting has become an indispensable part of the city, and lamps, as the main force of urban outdoor lighting, have also ushered in new development opportunities.     According to relevant statistics, my country's existing outdoor lighting market has reached 500 billion, maintaining a stable and upward development trend. Among them, LED, as a high-quality lighting fixture with more energy saving, more environmental protection, longer life and smaller volume, is also widely used in various display, indication, decoration, backlight, lighting and urban lighting projects. With the continuous deepening of the national 14th Five-Year Plan to promote rural construction and new urbanization strategic actions, the new demand for outdoor garden lights, 5G smart street light poles, landscape lighting, commercial lighting and other products in towns will also gradually expand, which is highly beneficial to LEDs. industry growth. 01 Outdoor Lighting Waterproofing Points - Choose a high-quality sealant!     At present, outdoor LED lighting mainly includes LED street lights, garden lights, wall washers, buried lights, landscape lights, stage lights, underwater lights, light strips, light bars, etc. Due to the influence of natural conditions such as sand, dust and chemical gases, it has extremely high requirements on the service life and waterproof function of lamps. Especially in China, where the latitude spans a great deal, outdoor LED lighting needs to face extreme climates such as thunderstorms, rain, high temperature and humidity, and cold and snowy areas. As an indispensable sealing and waterproof material for outdoor LED lighting, the quality of sealant， It can be said that it determines the service life of the lamp. The case of water ingress of lamps caused by improper use of sealant      Buried lights flooded                                                           Park wall washer light enters water       At present, silicone sealant has become the mainstream choice for sealing and bonding of outdoor lighting fixtures. High-quality silicone sealant products not only have good product waterproofness and air tightness, but also have excellent aging resistance and high and low temperature resistance, which can escort the safety of lamps for a long time and illuminate the deep night of every city. 02 Outdoor lighting sealant, choose BAIYUN, just right!     Demand is ever-changing, beyond demand. As a leading enterprise of silicone sealant in China, BAIYUN has been committed to the research and development of silicone sealant for LED lighting. At present, BAIYUN has formed a series of innovative and high-quality LED lighting adhesive solutions covering shell bonding, chip packaging, driver potting, interface thermal conductivity, etc., which are suitable for various types of lamps and lanterns. Advantages of BAIYUN Lighting Silicone Sealing and Bonding Solution:     It has good yellowing resistance, low volatility, neutrality, no corrosion, no halogen and no sulfur, wide adhesion, good adhesion durability, and excellent overall performance.     Compared with the traditional silicone sealant, the new Baiyun brand silicone sealant has a faster curing speed, is resistant to yellowing, and enhances the breadth and durability of bonding. It is used for the bonding of LED lighting products. Sealing reliability provides a strong guarantee.

    Shenzhen has grown from a small fishing village to the present, but it has been more than 40 years, and the current urbanization has reached 100%, which is the best result of my country's urbanization development. As a leading company in China's sealant industry, BAIYUN has deeply participated in the process of Shenzhen's urbanization development, helping Shenzhen to build a large number of super high-rise buildings and landmark buildings, and helping Shenzhen to bloom. Among them, the world's tallest twin towers, the West Tower of Shenzhen Xinghe Yabao WORLD Building, which will be completed in 2023, is another masterpiece of BAIYUN's contribution to Shenzhen's urbanization.   Project Name: Shenzhen Xinghe Yabao WORLD Building West Tower Project height: 369 meters Project floor: 74th floor BAIYUN assist field: curtain wall     The Xinghe Yabao WORLD Park, which belongs to the West Tower of Shenzhen Xinghe Yabao WORLD Building, is located in Longban District, Shenzhen. It occupies the central axis of Shenzhen and enjoys the dual strategic advantages of the urban core area and the world-class electronic industry cluster carrying area, integrating the economy, commerce and culture of the Greater Bay Area. Resource strength, connect Hong Kong, undertake Futian, and radiate the Guangdong-Hong Kong-Macao Greater Bay Area.     As the final piece of the Xinghe Yabao WORLD Park, the Shenzhen Xinghe Yabao WORLD Building topped the list of domestic twin towers with a height of 369 meters. After completion, it will become a new city landmark in Shenzhen North. During the period, BAIYUN, as the only provider of sealing adhesive solutions for the curtain wall part of the Xinghe Yabao West Tower project, presented a complete sealing and bonding solution for the curtain wall system for the project.      Project Highlights - First height - The twin towers of about 369 meters are the tallest twin towers in China. - Responsible for the facade - The first office building in the Greater Bay Area with "wind" as its design concept, creating a unique image of the "Gate of Two Towers in the Bay Area". - Green Building - Shenzhen's first low-carbon building complex designed according to the LEED-ND standard, and has obtained the ELL-Core platinum certification to build a sustainable green and healthy building.     In order to ensure the long-term safety of Shenzhen Xinghe Yabao WORLD Building, a super high-rise building, BAIYUN not only provides high-quality sealant products with a 25-year warranty for the project, but also visits the site several times to provide technology for project design and construction units. System solutions for sealing problems such as research and development, sealant joint design, construction training, etc. With the excellent performance parameters and perfect whole-process service of the product, BAIYUN has been unanimously recognized by the designer, the constructor and the owner, and has successfully provided a complete set of curtain wall systems from glass curtain wall to aluminum panel curtain wall for the whole project. Program.     At present, the curtain wall laying of the west tower of Shenzhen Xinghe Yabao WORLD Building is in full swing. After completion, Shenzhen Xinghe Yabao WORLD Building will become another scenic line in Shenzhen together with other projects that BAIYUN helps Shenzhen to help Shenzhen city. further development.

On the afternoon of March 31, the signing ceremony of the "Baiyun Chemical Fund" donation agreement was held at the School of Materials Science and Engineering, South China University of Technology. Miao Mingsong, General Manager of Guangzhou Baiyun Chemical Industry Co., Ltd., Chen Jianjun, Manager of Science and Technology Development Department, Zhou Futian, Manager of Administration Department, Wu Miaoxian, Executive Deputy Secretary of the Party Committee, School of Materials Science and Engineering, South China University of Technology, Peng Shuli, Deputy Party Secretary, Professor Zeng Xingrong, Mai Qipeng Teachers, Wang Haotong and representatives of polymer graduates attended the ceremony. Wu Miaoxian, Executive Deputy Secretary of the Party Committee, School of Materials, South China University of Technology make a speech In her speech, Ms. Wu first expressed her heartfelt thanks to Baiyun Chemical on behalf of the school, and said that Baiyun Chemical's corporate core values of "taking responsibility, creating value, and sharing results" are highly consistent with the college's philosophy. She hopes to further promote cooperation with Baiyun Chemical in the future. The cooperative relationship between schools and enterprises will jointly create higher social value, cultivate more outstanding talents, and work together to realize the vision of "making the world a better place". Miao Mingsong, general manager of Guangzhou Baiyun Chemical Industry Co., Ltd., delivered a speech In his speech, Mr. Miao said that the School of Materials and Baiyun Chemical has cooperated for 24 years and has achieved fruitful results. This excellent transcript comes from the unremitting efforts of South China University of Technology and Baiyun to work together and work together. At present, the world is undergoing major changes unseen in a century. The industrial chain, supply chain and value chain are continuously being reconstructed. As a strategic and pillar industry of the national economy, new materials are the cornerstone of modern manufacturing. It is hoped that the two parties will work together and that more students from the School of Materials will join Baiyun and contribute to the new material industry. In the silicon-based era, the future has come, let's go to the future together! Later, at the signing ceremony, Miao Mingsong, the representative of the company, and Wu Miaoxian, the representative of the school, jointly signed the donation agreement, and issued a donation certificate to the donor Guangzhou Baiyun Chemical Industry Company. The road of school-enterprise collaborative education between Baiyun Chemical and South China University of Technology will continue to move forward. I also wish the students a bright future and write an excellent chapter of life! In the future, Baiyun Chemical will continue to practice the core values of "taking responsibility, creating value, and sharing results" with practical actions, adhere to the industry to serve the country, adhere to long-termism, and work together to build a great enterprise!

The Hong Kong Center for Health Protection held a press conference on March 21 to report that from 0:00 to 24:00 on the 20th, there were 14,068 new confirmed cases of new coronary pneumonia in Hong Kong. So far, there are more than 280,000 confirmed cases in Hong Kong. The mainland-aided community isolation and treatment facilities at Hong Kong's Penny's Bay and Kai Tak Wharf belong to the permanent buildings in this central-aided construction plan for Hong Kong's emergency isolation facilities. The construction model is assembled and constructed, and a total of about 10,000 new isolation units will be built. The additional quarantine facility in Penny's Bay, Hong Kong covers an area of more than 450,000 square meters and a building area of more than 260,000 square meters. It is 2 floors high and is divided into 6 areas. It consists of 69 quarantine buildings and their supporting facilities (command center, medical center, etc. ), which will provide more than 6,500 isolation units for Hong Kong after completion, making it the largest isolation point in Hong Kong. The additional isolation facility in Kai Tak, Hong Kong covers an area of ​​more than 80,000 square meters, with a construction area of ​​more than 140,000 square meters. It is 4 stories high and divided into 3 areas. After completion, it will provide more than 3,000. In this aided construction project, both projects have problems such as many detailed nodes, large volume, tight construction period, and heavy tasks. At the same time, as permanent isolation facilities, the two projects also have a very high impact on the quality of the project. It is a great challenge to the resource mobilization efficiency and product quality of participating enterprises. Aid to Hong Kong to fight the epidemic As a leading company in the domestic sealant industry, BAIYUN participated in the construction of two aided community isolation treatment facilities in Hong Kong. With high-quality environmental protection products and professional application technology, BAIYUN has provided a high-scoring answer sheet with efficient assistance. Since the start of the project, BAIYUN has provided most of the system sealing solutions for roof bonding, building fire protection, and all door and window bonding for the project site. Other classic projects of BAIYUN's assistance: Guangzhou International Health Station: The first international health station in China Shenzhen Baguang Prevention and Control Isolation Hotel: a key project of Shenzhen Construction and Public Works Administration in 2021 Shenzhen "Xiaotangshan" Hospital (Phase II of Shenzhen Third People's Hospital), Shanghai "Xiaotangshan" Hospital (a temporary medical housing project for emergency treatment of Shanghai Public Health Clinical Center), Nanchang "Xiaotangshan" Hospital (Xianghu Branch Project of the First Affiliated Hospital of Nanchang University), Nantong Sixth People's Hospital Isolation Ward Expansion Project… We believe that the strength of unity will inevitably lead us to win this battle. We believe that the power of quality will provide the most reliable guarantee for our victory. BAIYUN, Aid to wonderful life!  

This is the third time that China has hosted an Olympic Games after the 2008 Beijing Olympics and the 2014 Nanjing Youth Olympics, becoming the ninth country to host both the Summer Olympics and the Winter Olympics. “The City of that hosted two Olympics". After China won the right to host the 2022 Winter Olympics in 2015, the Winter Olympics work has been carried out in full swing in the competition area. As for the most eye-catching scenery, of course, the Winter Olympics supporting projects are indispensable! Support the Winter Olympics, let us shine! As the Winter Olympics mainly held on ice and snow, most of its sports venues are mainly outdoor, and only a few events are held in indoor venues. For the Beijing Winter Olympics, we adhered to the concept of green and thrifty throughout the preparation process, and did not engage in repeated construction, especially in the construction of venues. Eleven of the 13 venues in the Beijing Division are the legacy of the Summer Olympics, and the "Double Olympics venues" have become the highlight of the Beijing Winter Olympics. Therefore, the construction of the Beijing Winter Olympics construction project is mainly based on supporting high-speed rail stations, reception hotels at all levels, talent apartments, and leisure and entertainment facilities. As a leading enterprise in China's silicone sealant industry, BAIYUN, after assisting the construction of many Summer Olympic venues in 2008, once again supported many Winter Olympic supporting projects with high-quality products and professional technical services—— 01 Taizi Cheng High Speed Railway Station The world's first high-speed rail station connected to the Olympic Village is the main external transportation gateway for the core area of the Winter Olympics in Taizi Cheng, Chongli District. 02 Shougang Park Shangri-La Hotel Project Shangri-La Hotel is located in the center of Shougang Park, adjacent to the Winter Olympics ski jumping platform and the national team's winter training center. 03 Chongli District Taizi Cheng Town Prince City Project One of the important supporting projects for the Winter Olympics in Chongli District, will undertake the supporting functions of the core area of the Winter Olympics during the competition, and provide services such as Winter Olympics awards, VIP reception, transportation, and entertainment. 04 winter Olympics State Guest Villa Project One of the important supporting projects for the Winter Olympics in Chongli District, it covers an area of 62 hectares and consists of several single-family guesthouse buildings. It is positioned as a high-standard VIP reception hotel for the Winter Olympics. 05 Zhangjiakou Winter Olympic Village The supporting facilities of the Zhangjiakou Division of the 2022 Winter Olympics will be the main residence of athletes, coaches and delegation members of various countries and regions during the competition. Different buildings carry different functions. As important supporting projects for the Winter Olympics, they will become another window for the world to look at China, showing the world the true beauty of modern China. Support for the Winter Olympics! In the process of serving these projects, BAIYUN not only provides high-quality sealants for the projects, but also provides system solutions for project design and construction units such as technology research and development, sealant joint design, construction training and other sealing problems. Previously, BAIYUN assisted a large number of classic Olympic projects in many large-scale competitions such as the 2008 Beijing Olympic Games and the 2014 Nanjing Youth Olympic Games.   Bird's Nest (National Stadium) Water Cube (National Aquatics Center) Beijing Olympic Traffic Command Center Laoshan Velodrome Olympic Village China Agricultural University Gymnasium Urumqi Olympic Sports Center; ...

In 2021, thanks to the boost of the "dual-carbon strategy", the new energy vehicle track will be completely on current. This year is also known as the year of the rise of new energy vehicles. In the past year, the strong rise of new energy has rewritten the pattern of the auto industry, and the new energy track has also become the main direction sought after by all car companies. More and more car companies and technology companies have joined the ranks of new energy vehicles. Among them, various new technologies continue to emerge. Among them, sealant, as an important material for bonding and sealing solutions in the automotive field, is also favored in the field of new energy vehicles. Taking the electronic control system as an example, with the miniaturization, integration, and intelligence of the design of the components of the motor, electronic control, and battery system, and the application environment becomes more complex, the technical requirements are becoming more and more stringent. The requirements for sealants are also getting higher and higher, and the market is looking for more professional and representative specifications to endorse various accessories. Among them, IATF16949, as a technical specification for international automotive quality, has also been adopted by the new energy vehicle industry and has become one of the important specifications. IATF16949 Quality Management System The IATF16949 quality management system is formulated by the IATF organization. It is based on the ISO9000 standard but is a more professional quality management system standard for the automotive industry. The IATF16949 quality management system is based on the theory and method of total quality management, absorbs and draws on the practice and opinions of world-renowned quality experts, and evolves into a set of quality-centered, comprehensive and comprehensive management methods and management concepts. Today, the IATF16949 quality management system has become the entry threshold for high-quality automotive industry chain enterprises and is deeply trusted by the industry. As early as 2011, BAIYUN has obtained TS16949 (predecessor of IATF16949) certification, and responded to the ISO9001:2015 quality management system, and updated the standard to IATF16949:2016 in 2016, which has been up to 11 years. In the past 11 years, BAIYUN has established a solid cooperative relationship with many large car companies with professional products and high-quality services, contributing to the fields of cars on traditional tracks, rail locomotives and new energy vehicles on emerging tracks. From the traditional automotive field to the emerging automotive field, the "small material, big effect" sealant is shining brightly. With the development of the new energy vehicle industry entering the fast lane, sealants will inevitably play a greater role in this new field. As a leader in the sealant industry, BAIYUN has always focused on the sealant industry, adhering to the corporate mission of dedicating the best products to human beings, providing users with a variety of products and professional solutions for sealing systems - BAIYUN, Aid to Beautiful life!

     Hello everyone, in the first part of the last issue about the cause analysis and solution of the foaming problem during the use of sealants, we introduced three cases of foaming and their cause analysis and solutions, including random foaming, foaming from broken rods and blistering from chemical reactions. In this issue, we will continue to introduce the other three causes of blistering and their solutions, which are the blistering caused by the thermal expansion of the gas in the closed sealant joint, and the blistering caused by the moisture of the interface or accessory material. and blistering caused by construction under outdoor high temperature conditions (4) Foaming caused by thermal expansion of gas in closed sealant joints     This type of blistering occurs less frequently, and occasionally occurs in single components or doors and windows. This kind of foaming usually occurs in the sealant seam where the temperature of the sealant injection environment is relatively high and the sealant injection is relatively closed. Such blistering is not caused by the aforementioned breakage of the foam rod, and there is no problem with the foam rod, but after the sealant injection, there are local small blistering on the surface of a few sealant joints, or short strip-shaped blistering. As shown below Figure 1 Blistering in closed sealant joints     The reason for this type of foaming may be that in the entire closed sealant joint, the air sealed in the sealant joint after the sealant injection, when the temperature is high (generally higher than 15 ℃), expands in volume, causing the uncured air. Foaming on the surface of the sealant. The probability of such foaming is generally small, and it is obviously affected by temperature. The higher the temperature, the higher the probability of foaming, and the lower the temperature (below 15°C), the lower the probability of foaming.    The reason for this type of blistering can also be verified by field tests. In the same project, in the same unit plate with the same design size and material, different methods of filling foam rods and different sealants were used, and several field tests were carried out successively. The test results show that after excluding other influencing factors, the main cause of foaming is temperature. When the temperature is high, the probability of blistering is high; when the temperature is low, the probability of blistering is very small. Testing with different batches of sealant yields consistent results and is not directly related to sealant. Figure 2 Bubbling phenomenon in closed channel     Since this situation is caused by the expansion of the air sealed in the sealant seam, the most direct solution to this situation is to avoid complete sealing as much as possible. together. If the construction process needs to completely close the sealant joint, pay attention to the possible influence of high ambient temperature or large temperature difference during sealant injection. (5) Foaming caused by wet interface or accessory material     This kind of blistering phenomenon is because the interface or accessory material is wet, the moisture penetrates into the sealant seam, and the water vapor volatilizes, resulting in blistering on the surface of the sealant, as shown in the figure below. Figure 3 Blistering due to wet interface or accessory material     The probability of this kind of blistering problem is not very large, because there are more thunderstorms in summer, this kind of situation mostly occurs in summer. The solution is: do not construct in rainy days; after rainy days, make sure that the sealant joints and related accessories (such as foam sticks) are dry before construction. If necessary, remove the accessories and wait for the sealant joints to dry and refill before construction. (6) Foaming caused by construction under outdoor high temperature conditions     This kind of foaming phenomenon is caused by the construction under high temperature outdoor conditions. Under high temperature conditions, the temperature of the substrate in contact with the sealant is also relatively high, and the reaction is violent, and a large number of bubbles are released in a short time, resulting in the appearance of the sealant surface. blistering phenomenon Figure 4 Foaming caused by construction under outdoor high temperature conditions     The probability of such blistering problems is not very large. The solution is to suspend the construction under high temperature outdoor conditions, and wait for the temperature to drop before construction.     The above summarizes some of the causes of foaming. In actual engineering, the causes of sealant foaming may be more complex and diverse. It may be the combined effect of the above two reasons or multiple reasons, or other possible chemical reactions and gas release. , which needs to be further solved and improved in the continuous sealant application process.     The foaming mentioned in this article refers to the hollow inside of the sealant and the bulge on the surface of the sealant caused by various reasons, and does not include the phenomenon of “bulging” of the solid inside the sealant and the bulge on the surface of the sealant. The "bulging" phenomenon is the result of the combined effect of the weathering adhesive curing speed, ambient humidity, ambient temperature difference, and the width of the adhesive seam, panel material and size, etc. The inside of the sealant is solid, not hollow, and the phenomenon of foaming needs to be paid attention to. distinguish. Figure 5 The sealant joint of glass curtain wall is bulging (left) and the sealant seam of aluminum curtain wall is bulging (right)     The foaming of the sealant results in a hollow part in the colloid. In the foaming part, the actual thickness of the sealant is insufficient, the bonding area may decrease, and the bonding strength will decrease. This has an impact on the construction quality, not only the appearance, but also the waterproof and sealing properties of the sealant to a certain extent. The specific reasons for the foaming phenomenon of sealant are analyzed in the previous article, and most of the reasons are caused by improper construction. Therefore, the author recommends that in the actual construction of curtain wall doors and windows, the training of construction workers should be strengthened, the construction should be carried out in strict accordance with the construction process specifications, and attention should be paid to construction details, which can effectively avoid the occurrence of foaming problems and ensure the construction quality of the sealant.