GUANGZHOU BAIYUN TECHNOLOGY CO., LTD.

[BAIYUN Online] Explaining Drip Pollution on Curtain Walls

In the previous article "Explaining Seepage Pollution on Curtain Walls", Bai Xiaoyun introduced the manifestations, causes, prevention, and solutions for seepage pollution on curtain walls. But seepage isn't the only kind of stain. There's another common issue called drip stains (or runoff pollution). Let's dive into what that's all about!   1. What Do Drip pollution Look Like? Imagine dust and dirt building up on the sealant joints, ledges, or sloped parts of a building. Then, when it rains, that dirty water washes down the face of the curtain wall panels, leaving streaks behind. Ever look up at a tall building after rain and see those ugly "tear tracks" or streaks on the walls? That's drip staining. Drip pollution occurs above and below sealant joints. It appears not only on stone curtain walls and aluminum panel curtain walls but can also be observed on other curtain walls like glass curtain walls. This phenomenon is especially noticeable on light-colored stone and aluminum panel curtain walls, significantly impacting the overall aesthetics of the facade. Drip pollution on an aluminum panel curtain wall   Drip pollution on a stone curtain wall   Drip pollution on a glass curtain wall   2. Causes of Drip Pollution   01 Dust and Dirt Accumulation on Silicone Sealant Surfaces: The silicone sealant used in the joints has a surface that naturally attracts dust and dirt. Because it's also somewhat water-repellent, rain doesn't wash it clean very well. So, dirt builds up right there in the joint. When heavy rain comes, it washes this dirty sludge down the wall, leaving those tell-tale streaks. Drip pollution from this cause is significantly affected by air quality. In cities with poor air quality, curtain walls require more frequent cleaning. After severe weather events like sandstorms or haze, many curtain walls need cleaning. Schematic diagram of drip pollution     02 Inappropriate Architectural Design: Some curtain wall ledges or sloped surfaces are poorly designed, allowing dust to accumulate easily. Combined with inadequate drainage, rainwater washes this dust down, easily contaminating the curtain wall panels below.   Pollution caused by dust accumulation on a podium ledge affecting panels below Pollution caused by dust accumulation on a sloped surface affecting panels below   3,Prevention and Solutions for Drip Pollution 01 Regular Cleaning Unlike seepage pollution, drip pollution can be removed by cleaning the curtain wall surface. However, cleaning is time-consuming and labor-intensive, especially on high-rise, super high-rise, uniquely shaped, or complexly designed curtain walls. Cleaning curtain wall panels can be difficult, costly, and involves safety hazards for high-altitude work.   After cleaning drip pollution, the curtain wall's clean appearance is only maintained for a certain period, requiring cleaning again after some time. If relatively severe weather occurs, curtain walls may need frequent cleaning.   02 Optimize Curtain Wall Design During design, efforts should be made to avoid rainwater washing directly from dust-collecting ledges or sloped surfaces onto the curtain wall. Reasonable drainage measures should be designed, or appropriate rain-shedding features should be incorporated to minimize rainwater accumulation on the curtain wall.   03 Use Silicone Stain-Resistant Weather Proofing Sealant Silicone Stain-Resistant Weather Proofing Sealant uses silicone polymer as its main raw material, possessing the excellent aging resistance of silicone sealants. Through special formulation design, it avoids causing seepage pollution on porous materials like stone or coated materials. It also minimizes drip pollution near horizontal joints on curtain walls made of glass, metal, and stone, making it the currently recommended product for preventing drip pollution. Current products in this category from BAIYUN Technology include BAIYUN SS818/SS518 Silicone Stain-Resistant Weather Proofing Sealant   BAIYUN SS818/SS518 Silicone Stain-Resistant Weather Proofing Sealant is specifically designed for anti-pollution weatherproof sealing of various curtain walls. It causes no seepage pollution on porous materials like stone or coated decorative materials like aluminum panels and aluminum composite panels. Simultaneously, the Stain-Resistant Weather Proofing Sealant minimizes drip pollution on curtain walls, reducing cleaning frequency and lowering maintenance costs.   SS518 sealant even won a Polar Star Product Award!   Since its launch, BAIYUN SS818/SS518 Silicone Stain-Resistant Weather Proofing Sealant has been successfully applied in numerous domestic and international projects, including the Dubai Waterfront project, Philippines ATG Diamond project, Philippines Park Central Towers project, and the Guangzhou Baiyun International Convention Center Phase II Renovation project. Philippines ATG Diamond Project Guangzhou Baiyun International Convention Center Project   Guangzhou Baiyun International Convention Center Project To solve curtain wall pollution, start at the source:Use Silicone Stain-Resistant Weather Proofing Sealant to prevent seepage issues. Pair this with smart design that minimizes dirt traps. This dual approach will minimize drip pollution on curtain walls, reduce cleaning frequency, and lower maintenance costs.   BAIYUN firmly believes that through continuous technological innovation, widespread application, and the joint efforts of industry colleagues, we can lead the curtain wall industry towards a greener, more sustainable development path.   Let us join hands to safeguard every facade of our cities, making them an indispensable part of the urban landscape, and contribute to building a better living environment.

[Baiyun Online] How to Choose Sealant for Doors and Windows

Today, “Baiyun Online” is back again to share insights with you. Today’s topic: How to Choose Sealant for Doors and Windows   As channels of connection between indoor and outdoor environments, doors and windows are also the bridges of sunshine, air, and energy exchange, realizing the society’s concept of energy saving and emission reduction in modern life. High-quality doors and windows are essential for a high-quality life.   During the production of manufacturing these essential bridges, sealants, auxiliary materials in petty proportion though they are, play a crucial role in forming their performance, especially in terms of water, air, warm, sound insulation. If the sealant is of poor quality, it may cause issues such as water and air leakage, which seriously affect the air and water tightness of the doors and windows. So, what kind of sealant should be used for high-quality doors and windows? Today’s Baiyun Online will explore this with you.   01 Choose Products with the appropriate Movement Capability   Currently, the main standards for door and window sealants in China include GB/T 14683–2017 “Silicone and Modified Silicone Sealants for Construction” and JC/T 881–2017 “Sealants for Concrete Building Joints”. Both standards refer to ISO 11600 for classification methods and requirements. According to GB/T 14683, sealants are classified based on movement capability into levels of ±50%, ±35%, ±25%, and ±20%. JC/T 881 further includes ±12.5% and ±7.5% levels. Since door and window joints generally experience only small movement, they do not require sealants with high movement capabilities. Therefore, most sealants on the market are rated at ±12.5% or ±20%. However, high-movement-capability sealants offer better performance of joint movement, so when it comes to applications with larger joint displacement, the use of sealants with high movement ability is recommended as the preferred choice.   02 Choose Excellent Weatherproofing Sealants Among various types of sealants, silicone-based sealants have the best weather resistance. However, the quality of silicone sealants on the market varies. Some manufacturers significantly reduce the content of silicone base polymer in order to cut costs and instead use large amounts of cheap mineral oils and powder fillers. These are commonly known as “oil-filled sealants,” which pose serious quality risks. Although such sealants may initially appear to function well, over time, the mineral oil migrates, leading to the sealant’s hardening, chalking, and cracking. If these oil-filled sealants are in contact with insulated glass units (IGUs), the mineral oil can penetrate into the IGU, leading to oil infiltration or “rainbow effects,” ultimately compromising the seal and functionality of the glass unit.   Mineral oils belong to the alkane class of plasticizers. The national standard GB/T 14683-2017, implemented in 2018, strictly limits the use of alkane plasticizers in silicone sealants. It explicitly states that GW-class products must not contain detectable alkane plasticizers. Therefore, it is recommended to choose GW-class compliant silicone sealants. To determine whether a sealant is oil-filled, refer to GB/T 31851-2015 “Detection Methods for Alkane Plasticizers in Silicone Structural Sealants”. This standard outlines methods such as thermogravimetric analysis, weight loss on heating, and infrared spectroscopy to quantitatively or qualitatively detect alkanes (mineral oils). While accurate, these methods require advanced lab equipment. Our company, Baiyun Technology, led the development of the group standard TFSI 088-2022 “Rapid Detection Method for Alkane Plasticizers in Silicone Sealants,” which offers a quick identification method when you are in offices, factories, and construction sites: Apply the sealant onto a 12-micron thick, smooth PE film and observe after 24 hours.   The principle is simple—mineral oil in the sealant migrates and penetrates the film, causing it to become uneven. The more oil present, the quicker and more obvious the deformation. Non-oil-filled silicone sealants will keep the film flat no matter how long they are left.

Persistent Odors After Renovation? Baiyun Online Reveals the Truth!

Silicone sealant is an indispensable sealing material in home renovation, used for gap filling, waterproof sealing, and more. However, many homeowners face a common post-construction issue: Why does silicone sealant emit a pungent odor? This unpleasant smell is not only irritating but may also pose health risks. In reality, the odor is closely related to low-molecular-weight substances released during the sealant's curing process. Different types of silicone sealants vary significantly in environmental performance. Today, we explore the reasons behind the persistent pungent odor after sealant application. First, we need to understand the classification of silicone sealants based on the low-molecular-weight substances released during curing: -Neutral alkoxy silicone sealant -Neutral oxime silicone sealant -Acetic silicone sealant Origin of the Pungent Odor: The Risks of Oxime and Acetic Silicone Sealant Oxime Sealants: During curing, these sealants release oxime compounds such as butanone oxime. These volatile compounds have a strong, pungent odor. Prolonged inhalation may irritate the respiratory tract, eyes, and skin. Especially in poorly ventilated indoor spaces, the irritating odor from oxime sealants lingers, negatively impacting occupants' quality of life and health. This conflicts with modern green and healthy living concepts. Acetic Silicone Sealant: The curing process releases acetic acid compounds, which are highly irritating to the respiratory tract and eyes. Furthermore, acetic acid reacts with alkaline components in building materials (like ceramics and marble) and can corrode metal substrates, compromising renovation quality. Consequently, Acetic Silicone Sealants are unsuitable for whole-house finishing and sealing applications. The Eco-Friendly Alternative: Advantages of Alkoxy Silicone Sealant Alkoxy silicone sealants cure through a reaction with atmospheric moisture, releasing alcohol compounds. Compared to the oxime compounds released by oxime sealants, alcohols are significantly more environmentally friendly and have a much milder odor. Alkoxy silicone sealants are free from harmful substances like formaldehyde and benzene, safeguarding indoor environmental health from the source. Whether in high-humidity areas like kitchens and bathrooms or air-quality-sensitive spaces like bedrooms and living rooms, alkoxy silicone sealants deliver excellent sealing performance while protecting your family's health. Building a High-Quality Life with Green Solutions High-quality living is intrinsically linked to the building materials we interact with daily. Choosing eco-friendly alkoxy silicone sealants eliminates the nuisance of pungent odors and creates a green, healthy living environment for your family. Baiyun alkoxy silicone sealants is the green sealing solution backed by 30+ years of alkoxy silicone sealants technology expertise. It is the quality choice aligned with the high-quality development philosophy of whole-house finishing and the ideal choice to empower green environmental protection and bond to a healthy life.

What should be paid attention to in the construction of silicone structural sealant in winter?

    As an important auxiliary material widely used in bonding and sealing in the fields of building curtain walls, doors and windows, interior decoration, etc., sealant plays a role in every subtlety, even in winter, it has never stopped working diligently to isolate the cold from the "barrier". Today, let's take a look at how to correctly apply silicone structural sealants in winter.     The ambient temperature is very low in winter, and the following problems may occur: (1) Under low temperature and low humidity conditions, the curing speed and bonding speed of silicone structural sealant are slower than normal, which will lead to longer curing time and affect construction. (2) When the temperature is too low, the wettability of the silicone structural sealant and the surface of the substrate is reduced, and there may be imperceptible fog or frost on the surface of the substrate, which affects the adhesion between the silicone structural sealant and the substrate. PART 01 Countermeasures for slowing down curing (1) Take appropriate heating measures; (2) The two-component sealant is first subjected to a pull-off test to determine the appropriate mixing ratio; (3) One-component sealants need to be tested for surface drying time to determine whether they can be cured in this environment; (4) It is recommended to extend the curing period after sizing to ensure that the sealant has sufficient curing and curing time. PART 02 Countermeasures against bond failures (1) The adhesion test should be done in advance before construction, and the construction should be carried out in strict accordance with the recommended method of the adhesion test. (2) If necessary, consider using xylene to clean and apply primer solution to promote the speed of bonding and reduce the risk of poor adhesion due to low temperatures. (3) After the completion of the silicone structure sealant injection, the curing process should be in a clean and ventilated environment, and when the temperature and humidity of the curing environment are low, the curing time should be appropriately extended. Among them, the curing of one-component structural adhesive sealant has an obvious relationship with the curing time. In the same environment, the longer the curing time, the higher the degree of curing.     If necessary, measures can be taken to increase the ambient temperature and humidity. In the end, the sealant tapping test should prevail, and the curing time of the finished single parts should be fully determined. After the finished sealant tapping test is qualified , it can be installed and handled.

Participate in the construction of the world's largest single airport!

      Guangzhou Baiyun International Airport T3 terminal project has made new progress! At present, the overall progress of the project is more than 70%, and it is expected to be opened to traffic by the end of 2025. Baiyun Technology participates in the construction of the project throughout the process, and is committed to the deep integration of new technologies, new materials and new quality productivity. Provide system sealing adhesive solutions for the façade curtain wall and roof of Baiyun Airport T3 terminal, and help the world's largest single airport!     It is reported that the overall progress of the T3 project of Baiyun Airport is more than 70%, and more than 4,000 workers are currently fighting on the front line, interspersed with a variety of processes to ensure quality and quantity of sprint node tasks. It is planned to realize the terminal building with water and electricity by the end of this year, and reach the navigation conditions by the end of next year! The third phase expansion project of Guangzhou Baiyun International Airport is a key construction project of the Civil Aviation of China, Guangdong Province and Guangzhou City, mainly building the new T3 terminal, the two runways in the west 2nd and 3rd east, the GTC project, and the east 4th and west 4th corridors of the T2 terminal.Among them, the T3 terminal project is located on the southeast side of Baiyun International Airport, which consists of the main building, southeast corridor, southwest corridor, northeast corridor and northwest corridor. The terminal spans 970 meters from north to south and 592 meters from east to west. Its unique design is inspired by "flowers", 8 petals cleverly form the form of "flowers", when the sunlight shines through the glass dome like a "sea of colorful flowers", the fifth façade of the terminal building is like a blooming flower, forming a unique architectural image of "Yangcheng Corolla".     One of the difficulties in the construction of the T3 terminal project of Baiyun Airport lies in the severe test of the sealing material of its roofing system. Because the roof design of the terminal building contains large-size sealant joints, the sealant joints not only need to withstand fluctuations in external temperature and humidity, but also face strong direct sunlight and extreme weather for a long time, which can easily lead to material aging and cracking, which in turn affects the sealing and durability of metal roofs. Therefore, the selected sealant products must have excellent weather resistance, high and low temperature resistance to ensure that they can effectively prevent rainwater leakage and ensure building safety in complex and changeable natural environments.     Baiyun Technology's adhesive solutions for sealing systems can effectively cope with the difficult challenges of roof construction, with excellent weather aging resistance and high and low temperature resistance, as well as ultraviolet and water resistance, and can resist the impact of strong direct sunlight, large temperature differences and bad weather for a long time, escorting building safety. During the process of promoting the project, the whole process service team of Baiyun Technology also visited the site many times, gave detailed answers to the problems of glue used in the project, and guided the standard construction glue method.     

Assisting Bangladesh’s urban construction and lighting up landmark buildings

    In the northea.st of the Indian peninsula, Bangladesh is like a shining pearl, embedded in the embrace of the Ganges and Brahmaputra rivers. This ancient and vibrant land has witnessed the integration and prosperity of countless civilizations and is now welcoming the dawn of a new era.     As the morning sun in the east illuminates this hot land, a magnificent chapter of modernization is slowly opening. Baiyun Technology has crossed mountains and seas to provide safe and complete adhesive solutions for many landmark buildings in Bangladesh, helping Bangladesh and China to achieve win-win cooperation and work together on the road of modernization and globalization! Bangladesh-China Friendship Exhibition Center     The Bangladesh-China Friendship Exhibition Center is a landmark project of the "Belt and Road" jointly built by China and Bangladesh, and is also a vivid practice in response to the country's "Belt and Road" initiative. The project has a total construction area of ​​33,000 square meters, including exhibition halls with about 800 booths, public and technical supporting facilities. It is the largest exhibition center in Bangladesh. After completion, it will be of great help to Bangladesh in developing domestic and foreign trade, responding to the development of the "Belt and Road" and improving the national economy. Witness China's speed and bond China-Bangladesh friendship. 2025 is the 50th anniversary of the establishment of diplomatic relations between Bangladesh and China. In this milestone year, the Bangladesh-China Friendship Exhibition Center is not only a display of an architectural miracle, but also a symbol of the deep friendship and close cooperation between the two countries.     BAIYUN is honored to be the only designated glue supplier of the Bangladesh-China Friendship Exhibition Center with its excellent product quality and professional full-process service. In the project construction, BAIYUN provides not only high-quality sealant products, but also a support for the beautiful vision of cooperation between the two countries.   Glass House     Glass House is a high-profile high-end commercial and office building located on Gulshan Avenue in Dhaka, Bangladesh. The building has become a prominent landmark in Gulshan. Not only is it located in one of the most expensive locations in Dhaka, it also embodies luxury and high-end office standards, attracting many well-known companies to choose it as their headquarters or offices. place.   Shahjalal Bank            

Read silicone thermally conductive potting adhesive in one article!

   Read silicone thermally conductive potting adhesive in one article! Today, let's walk into the wonderful world of silicone thermally conductive potting adhesive and see how it shines on the stage of science and technology!        1. The composition of silicone thermally conductive potting compound     Silicone potting adhesive is a potting material composed of organic polysiloxane-based adhesive, crosslinker, catalyst, filler and other functional additives. It has the advantages of a wide range of operating temperatures, excellent thermal stability, good chemical stability, excellent electrical insulation properties, certain water resistance, weather resistance and UV resistance, easy molding and environmental protection. These advantages have led to a wide range of applications in silicone encapsulants. 2. Classification of silicone thermally conductive potting compounds     Depending on the composition of the encapsulant, silicone encapsulants can be divided into two categories: one-component and two-component. Among them, the main advantage of one-component potting compound is that it can be used directly, without deaeration, and is easy to operate; Two-component silicone encapsulants need to mix a liquid base adhesive with a catalyst or crosslinker, so they are generally used for insulating encapsulation materials or airtight shock-absorbing and waterproof materials. According to the different curing mechanisms, silicone encapsulants are divided into two systems: condensation type and addition molding system. Among them, the addition of silicone potting adhesive has many advantages, such as no by-products during curing, deep vulcanization, small shrinkage, and rapid curing at room temperature or heating, so it is widely used in the field of electronic potting. 3. Thermal conductivity: the "superpower" of silicone potting adhesive     Pure silicone encapsulants have poor thermal conductivity, which makes it difficult to meet the requirements of stability and heat dissipation for electrical appliances due to the densification and miniaturization of electronic components. Therefore, it is of great significance for the development of the modern electronics industry to endow the silicone encapsulant with a thermal conductive function. The easiest way to prepare silicone thermally conductive potting adhesives is to add some highly thermally conductive fillers to silicone-based adhesives. The type and properties of the thermal conductive filler have an impact on the thermal conductivity of the potting compound, but the thermal conductivity of the thermally conductive potting compound mainly depends on the interaction between the polymer matrix and the thermally conductive filler. The key to obtaining high thermal conductivity potting compound material is to form an effective thermal conductive network chain inside the material: after the filling content of thermal conductive filler reaches a certain critical value, a thermal conductivity path similar to a network structure will be formed inside the composite material, so that the thermal conductivity of the potting compound will be significantly improved. 4. there is a "mystery" of thermal conductive fillers    There are many types of thermal conductive fillers, mainly including metal powders, metal oxides and nitrides, carbon materials, etc. In general, filler filling with high thermal conductivity can produce composites with high thermal conductivity. At the same time, the use of fillers with different particle sizes can help the fillers to better form a thermal conductivity path with each other, and the small particle size fillers can fill the gaps between the large particle size fillers, so as to significantly improve the overall thermal conductivity.   The surface treatment and processing of the filler allows the silicone and the filler to be better bonded, reducing the thermal resistance between them, and making the silicone system less viscous and allowing more fillers to be added. In this way, the final silicone has good thermal conductivity and is easy to process. However, the key to achieving the best thermal conductivity and overall performance is to properly select and improve the filler and to mix it appropriately.

Baiyun Technology Attends the 49th Annual Meeting of the International Organization for Standardization Technical Committee on Building Sealants (ISO/TC59/SC8)

    In late October 2024, the 49th annual meeting of ISO/TC59/SC8 (International Organization for Standardization/Technical Committee on Building and Civil Engineering/Subcommittee on Sealant) will be held in Osaka, Japan. 21 experts from China, the United States, the United Kingdom, France, Germany, Belgium, the Netherlands, Japan, and South Korea attended the meeting. Zhang Guanqi, Technical Director of Guangzhou Baiyun Technology Co., Ltd. (referred to as "Baiyun Technology"), was invited to attend the meeting and give a keynote speech.     At the meeting, the attending experts introduced the progress of relevant work since the last annual meeting and discussed future work.     Zhang Guanqi, Technical Director of Baiyun Technology, as the convener of the WG10 "Aesthetic Issues" working group, introduced the progress stage of the ISO 19067 "Building sealants - Determination of color change after accelerated aging in the laboratory" standard that is currently being developed, the registration of experts in the working group, the voting situation of the WD (Working Group Draft) draft, and the results of the verification test. This project has entered the CD (Committee Draft) voting stage, and the voting will end at the end of October. The attending experts reviewed the CD draft, and the subsequent preparation team will make revisions to the CD draft based on the revision suggestions raised at the meeting and the opinions collected during the CD draft voting process, and form the DIS draft before the end of the year. The work of the WG1 "UV Effects" working group is to revise the ISO 11431:2002 standard "Building Structures - Jointing Products - Determination of Bonding Properties after Heat, Water, and Artificial Light Source Treatment through Glass". Currently, the standard has entered the DIS voting stage and will be revised based on feedback before entering the approval stage.     The WG25 "Mold proof Sealing Adhesive Specification" working group is a newly established working group in 2024, with the task of developing a standard for grading and requirements of mold proof sealing adhesive. The standard is currently in the draft stage of the WD working group, where experts discussed the classification principles and required items. The subsequent preparation team will continue to advance the writing work and vote on the WD draft as soon as possible. The preparatory work team for the coating ability of sealant introduced the preliminary research work and standard draft. Subsequently, the WG19 "Coating Ability and Compatibility with Coatings" working group will be restarted to promote the standard preparation work.     The preparatory work team for the coating ability of sealant introduced the preliminary research work and standard draft. Subsequently, the WG19 "Coating Ability and Compatibility with Coatings" working group will be restarted to promote the standard preparation work. In addition, the conference also conducted a review of standards such as ISO 11527, ISO 13640, ISO 16938-1, and ISO 16938-2.     Standardization work is crucial for the high-quality development of China's economy, and the government encourages enterprises to actively participate in domestic and international standardization work. As a national enterprise in the Chinese sealant industry, Baiyun Technology has spared no effort in participating in the formulation and revision of various sealant related standards at home and abroad. As of August 2024, Baiyun Technology has participated in the formulation and revision of over 240 standards, of which 189 have been successfully published.     International standardization and internationalization of standards are important directions for China's standardization work in the new era. Baiyun Technology has been actively supporting the revision of international standards in the sealant industry. Not only does it send experts to attend the ISO/TC59/SC8 annual meeting every year, but it also successfully co organized the 43rd ISO/TC59/SC8 annual meeting held in Guangzhou in 2018, becoming the only Chinese sealant enterprise to co organize the meeting. Over the years, experts from Baiyun Technology have participated in multiple ISO sealant standard working groups (WGs), including the leading ISO 13638:2021 standard. They have participated in the development, revision, and successful publication of over 10 ISO standards.     In the future, Baiyun Technology will continue to vigorously promote the revision of international standards for sealants, and represent China on the stage of international standards for sealants, contributing to the internationalization of Chinese standards, the internationalization of Chinese sealant brands, and their global presence.