September 23, 2022
The surface of the highest 83 degrees set off a monstrous heat wave,
About 3000 hours of sunshine all year round evaporate every trace of water.
This is the Flaming Mountain in Xinjiang.
In 2012, BAIYUN launched the "50-year durability test of silicone sealant" in cooperation with the Aging Research Institute of Guangzhou Synthetic Materials Research Institute, and put silicone sealant samples in the exposure test field next to the Flaming Mountain in Turpan, Xinjiang. This is the first step in the 50-year durability test of natural exposure of silicone sealants in the world. In 2014, BAIYUN established a solid curtain wall at the Turpan exposure test site to investigate the performance change law of the silicone sealant on the solid curtain wall under stress.
After years of high temperature and exposure, how is the application of sealant on the BAIYUN physical exposure wall? Compared with other brands of sealants, what is the difference?
In 2022, on the occasion of the 10th anniversary of Xinjiang's 50-year durability test, BAIYUN will conduct a detailed inspection of the weather-resistant sealant and structural sealant of the glass curtain wall at the Xinjiang durability test base. In this issue, let us first walk into the actual application of weather-resistant sealants for glass curtain wall panels in Xinjiang, and explore together the durabilitys of weather-resistant sealants—
01
Sample situation
Project: Xinjiang Exposure Curtain Wall
Location: Flaming Mountain, Xinjiang
First sizing time: September 2014
Sampling plate: front view of the large curtain wall - the unit element in the lower right corner, the control wall
Sealant type: SS811, oil-filled sealant
▲The left (lower right of the large curtain wall) is the sampling area of BAIYUN weather-resistant sealant;
The right (middle of the small curtain wall) is the sampling area for oil-filled sealant.
02
Sample site observation
It can be seen from the on-site observation that the BAIYUN weather-resistant sealant has no cracking, chalking, brittleness and other phenomena, and the adhesion is good.
Comparing the insulating glass in contact with Baiyun weather-resistant sealant (left) and oil-filled weather-resistant sealant (right), it can be seen that the insulating glass in contact with Baiyun weather-resistant sealant did not change significantly, while the insulating glass in contact with oil-filled weather-resistant sealant did not change significantly. Insulating glass and butyl rubber are dissolved.
Baiyun brand weather-resistant sealant VS oil-filled weather-resistant sealant
This kind of problem occurs because the oil-filled sealant contains alkane plasticizers (also known as white oil). These alkane plasticizers will migrate and diffuse out, and lead to a sealant of the insulating glass through the second structural adhesive of the insulating glass. Butyl gum was dissolved. This usually leads to the destruction of the air tightness of the insulating glass. It is foreseeable that if this kind of oil-filled sealant is used in the building, it will inevitably lead to the complete failure of the insulating glass under long-term use, resulting in problems such as condensation, accumulation of water, and oxidation of the Low-E film, which will cause the insulating glass to lose its effectiveness. It should have the functions of energy saving and heat preservation, light transmission and heat insulation.
03
Sample test
Hardness Testing
Sample test description: According to "Test Method for Indentation Hardness of Vulcanized Rubber or Thermoplastic Rubber" GB/T 531-2009, use a Shore durometer to test the hardness of the sealant strip samples.
Sample test data:
Conclusion: The hardness of the normal weather-resistant sealant remains good. The initial hardness of SS811 is 35, and the current hardness is 41. After 8 years of aging, the hardness has increased to a certain extent, but the increase is not large, and it still has good elasticity, which can continue to escort the curtain wall. .
The hardness of the oil-filled sealant changes greatly, from the initial 30 to 65 in 2 years, and to 79 after 8 years. It has no elasticity and cannot play a sealing role.
Weathering Sealant Tensile Testing
Sample test instructions: Cut the weather-resistant sealant strip into a dumbbell-shaped test piece. The tensile test of dumbbell-shaped specimens is based on "Determination of Tensile Stress-Strain Properties of Vulcanized Rubber or Thermoplastic Rubber" GB/T 528-2009, made into dumbbell-shaped specimens, and tested on a tensile testing machine (the test environment temperature is 23 ℃ ).
Sample test data-
Tensile Data for SS811 Silicone Weather Resistant Sealant
Conclusion: The average tensile strength of SS811 silicone weather-resistant sealant is 2.25MPa, and the elongation at break is 665.5%. The sealant sample still has good elasticity.
Through on-site inspection and data comparison, it can be seen that BAIYUN brand silicone weatherproof sealant has been tested in extreme environments for many years, and still maintains good performance. The warranty period of sealant and door and window sealant is up to 25 years, providing real and effective reference data.
The world's first 50-year durability test for sealants
Seeing is believing, data is proof!
In order to study the natural aging change law of silicone sealants, obtain the actual service life of silicone sealants, and provide more data support for improving the warranty period of silicone sealants, in 1997, BAIYUN adhered to the sense of responsibility and established a solid curtain wall development. corresponding research;
In 2012, BAIYUN cooperated with a third party - Guangzhou Synthetic Materials Aging Research Institute, and successively put samples in Guangdong and Xinjiang Turpan exposure fields and established a solid curtain wall to conduct atmospheric aging natural exposure to silicone sealants. The test is the first of its kind in the world for the 50-year durability test of natural exposure of silicone sealants.
The exposure fields in the two places are the oceanic climate environment with high temperature and humidity and the desert climate environment with high temperature and dryness, which are quite representative.
The time span is as long as 25 years, and the space span is half the earth. After being tested in a variety of extreme environments such as high temperature, drought, and humidity, BAIYUN sealant still exhibits excellent strength, elasticity and adhesion. We promise to provide a solid endorsement, and also provide a reliable basis for calculating the design and service life of silicone sealants in various regions. In the formulation of industry standards, national standards, and even international standards, we provide scientific and credible data support to achieve. It is of great value to maintain the healthy development of the industry and the future safety of the city.
