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50-year limit test

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Sealant 50-year limit test why exposure in these two places?

Sealant 50-year limit test why exposure in these two places?

In 2012, Guangzhou Baiyun Chemical Industrial Co., Ltd. launched the "50-year limit test" durability study in cooperation with the Institute of Aging Research, Guangzhou Institute of Synthetic Materials, and created the first domestic limit test for structural sealants. This test is also the first in the world. Study on the ultimate anti-aging performance of the three-party participation.

The 50-year limit test natural exposure was selected to be conducted simultaneously in two natural exposure fields in Turpan and Guangzhou.
The researchers carefully selected,
Why are these two sites last?
Please listen to Bai Xiaobian in detail.
Silicone sealant has excellent cold resistance, heat resistance, weather resistance and other properties, mainly because the silicone rubber molecular backbone is -Si-O-bond inorganic structure, the side group is an organic group of elastomers, Due to the fact that they are semi-inorganic, saturated, hetero-chain, and non-polar elastomers, these structures effectively improve the weathering resistance and high- and low-temperature resistance of silicone adhesives (the term “silicone rubber” is provided by the Encyclopedia of Industry). performance. Therefore, silicone sealant has become the preferred adhesive sealing material for building curtain walls.
Although silicone rubber has excellent weathering resistance, it is also a polymer material and can also be aged. For polymer materials, there are many natural environmental factors that affect their aging: oxygen, ozone, heat, water vapor, ultraviolet light, salt spray, acid rain, etc. may all affect its durability. Among them, heat, Water and ultraviolet rays. To study the anti-aging properties of polymer materials, it is usually necessary to conduct tests under conditions of both hot and humid and dry heat, such as the two largest exposure test sites in the United States: the Arizona and Florida exposure test sites are typically dry and hot regions and typical Hot and humid areas. Therefore, in China, we chose to conduct atmospheric exposure tests on silicone structural adhesives in two typical hot and dry heat-exposed areas in Guangzhou and Turpan.
Below, Xiao Bian will introduce China's two test fields.
Turpan: typical continental arid desert climate, dry and hot, windy and rainless
Guangzhou: A typical southern subtropical hot and humid climate with warm, moist and abundant light and heat
Turpan Exposure Base, commonly known as the "Fire Exposure," is located at the foot of the famous Flaming Mountain, in a cold climate zone, a typical continental arid desert climate. The experimental center is about 15 kilometers away from Turpan City and covers an area of ​​133 hectares. It is the largest natural heat exposure and natural exposure test base in China and the largest in the world. It is also the world’s largest test site in addition to the Atlas Global Climate Services Group in Arizona. The second major dry heat test site.

Natural exposure solid curtain wall established in 2014

 

Guangzhou exposure base, located in Baiyun District, Guangzhou, a subtropical humid rural climate zone, is surrounded by a small area with a dense artificial lawn. Under the jurisdiction of Guangzhou Synthetic Materials Research Institute Co., Ltd./Chemical Industry Aging Quality Supervision and Inspection Center, it has a long history. It is a third-party testing company with a fair status through National Measurement Accreditation (CMA2006001687B) and China National Accreditation Committee for Laboratory Accreditation (CNAS L1135). The institution is also the only national institution specializing in the quality inspection of synthetic materials in China. The natural exposure testing site has reached the world's advanced level.

Test shots launched in 2012

 

The two exposure fields respectively have extreme weather characteristics with obvious contrasts. Using the natural climate characteristics of the two places, a comparative test on the aging resistance of silicone sealants will:

1. Provide a reliable basis for the design life of silicone sealant in various areas such as dry heat, cold, hot and humid, and large temperature difference.

2. Providing strong data support for R&D, innovation and guidance of product applications under different climatic and environmental conditions, enabling companies to provide users with silicone sealant products that are safer and have better aging resistance.

3. Provide more reliable, scientific and credible basis for the development of industry standards, national standards and even international standards!