How to choose curtain wall structural sealant?

01-03-2022

The connection between the glass panel of the hidden frame curtain wall and the metal frame completely depends on the bonding of the structural adhesive, and the crosslinked and solidified elastic structural silicone sealant is like a continuous spring to "hang" the glass into the building facade. The application of this technology is far less mature than the traditional mechanical connection. The building code must consider the risks of owners and pedestrians, system aging and adhesive attenuation, unforeseen and uncontrolled factors in the project and the risk of falling curtain wall glass. Therefore, the correct selection of curtain wall structural silicone is particularly important.

Type selection of curtain wall structural sealant

structural silicone sealant

In JGJ 102-2003 technical code for glass curtain wall engineering, 3.1.4 clearly stipulates: "neutral silicone structural sealant must be used for bonding the glass and aluminum profile of hidden frame and semi hidden frame glass curtain wall; when coated glass is used for all glass curtain wall and point support curtain wall, acid silicone structural sealant shall not be used for bonding." Why structural adhesive must be silicone type is determined by the molecular structure of silicone structural adhesive. The molecular structure of silicone structural adhesive is mainly Si-O chemical bond, and its chemical bond energy (108kcal / mol) is greater than that of ultraviolet light. Therefore, silicone structural adhesive has excellent properties such as weather resistance, water resistance, ozone resistance, ultraviolet resistance, heat resistance and cold resistance. In addition, acid glue will corrode some metal materials, so acid glue cannot be used on the coating surface of aluminum profile and coated glass.

Standard for silicone structural adhesive

In JGJ 102-2003 technical code for glass curtain wall engineering, 3.6.1 clearly stipulates: "the performance of neutral silicone structural sealant and acid silicone structural sealant for curtain wall shall comply with the provisions of the current national standard silicone structural sealant for building GB 16776." Gb-16776 is a mandatory national standard.

The earliest relevant foreign standard is ASTM C 1184, which was first promulgated in 1991. At present, the new standard JG / T 475 silicone structural sealant for building curtain wall in China's construction industry has been released and will be officially implemented on April 1, 2016. This standard refers to the European standard Etag 002, which clearly requires that the service life of silicone structural sealant for building curtain wall shall not be less than 25 years. Compared with the previous relevant standards at home and abroad, the requirements are more scientific and strict to provide safety guarantee for building curtain wall.


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