Type selection and 4 performance descriptions of c

2022-07-22
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Tasani advanced curtain wall structural adhesive 9000 can be used for structural assembly and sealing of large dot type, full hidden frame, semi hidden frame curtain wall, aluminum-plastic and stone curtain wall. There are high requirements in product formula, technology, construction, etc.

type selection of curtain wall structural adhesive and four performance instructions

curtain wall structural adhesive is no stranger to many used for home decoration bonding, joint filling and sealing, It is mainly used for the connection between the glass panel of the hidden frame curtain wall and the metal frame, which is completely bonded by the structural adhesive. The crosslinked and solidified elastic adhesive is like a continuous spring to "hang" the glass into the building facade

tasani advanced curtain wall structural adhesive 9000 can be used for structural assembly and sealing of large dot type, full hidden frame, semi hidden frame curtain wall, aluminum-plastic, stone curtain wall. It has high requirements in product formula, technology, construction, etc. at the same time, the product has high-quality properties such as strong bonding performance, long shelf life, weather resistance, water resistance, cold resistance, etc. at the same time, the price of the product is relatively high, which is mainly used in engineering

I. type selection:

in JGJ 102-2003 technical code for glass curtain wall engineering, 3.1.4 clearly stipulates: "neutral silicone structural sealant must be used for the bonding of glass and aluminum profiles of hidden frame and semi hidden frame glass curtain walls; when coated glass is used for full glass curtain walls and point support curtain walls, acidic silicone structural sealant should not be used for bonding." Why structural adhesives must be silicone type is determined by the molecular structure of silicone structural adhesives. 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 the coating surface of aluminum profile and coated glass cannot use acid glue

when using curtain wall structural sealant, the standard implemented 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 current national standard silicone structural sealant for building GB 16776", and gb-16776 is a mandatory national standard

the earliest relevant foreign standard is ASTM C 1184, which was first issued in 1991. At present, the new standard jg/t 475 silicone structural sealant for building curtain walls has been issued and will be officially implemented on April 1st, 2016. The European standard Etag 002 is quoted in this standard, which clearly requires that the service life of silicone structural sealant products for building curtain walls should not be less than 25 years, which is more scientific and strict than the previous relevant domestic and foreign standards, so as to provide safety guarantee for building curtain walls

two, four performance descriptions:

1. Adhesion

is defined as the adhesion of sealant on a given substrate. Bonding depends on physical adsorption at the interface, chemical bond generation and mechanical occlusion to achieve connection. Good adhesion is the basis to ensure the sealant to achieve its function. It is clearly stipulated in the requirements of 5.3 of GB 16776-2005 that the adhesion test must be carried out between silicone structural adhesive and the substrate for actual engineering

2. Compatibility is defined as the performance that the contact surface between sealant and other materials does not produce adverse physical and chemical reactions with each other. Other materials generally refer to backing materials such as foam rods, double-sided adhesive tapes, and rubber strips. Qualified compatibility is the basis to ensure that the sealant maintains its own performance. It is clearly stipulated in the requirements of 5.3 of GB 16776-2005 that the compatibility test must be carried out between silicone structural adhesive and accessories for structural assembly system

3. Aging resistance

is defined as the time from the time when the sealant is embedded in the joint to its functional failure. In GB 16776-2005 standard, it is directly related to the tensile bonding performance after high and low temperature, immersion and water UV irradiation. In the standard, only the minimum value is specified for the judgment of the tensile bond strength of sealant after curing for a specified time under each aging condition. However, according to relevant experience and the judgment method of European standard, the ratio of the strength after aging to the strength under standard conditions, that is, the strength retention rate, should be calculated, and the greater the better

4. Displacement bearing capacity

the gluing width and thickness of silicone structural adhesive in the actual construction process are calculated by relevant specifications. In JGJ 102-2003 technical code for glass curtain wall engineering, the calculation formula for the bonding thickness ts of silicone structural adhesive is given, which has a parameter, namely δ Value, δ It represents the displacement bearing capacity of silicone structural sealant, which is made by different manufacturers δ Values are different. And the 102 specification also gives two restrictions. The thickness must be greater than or equal to half of the width and less than or equal to the width, and the thickness must be between 6 and 12mm. In the new jgj102 specification, this formula has also been changed. Regardless of the old and new specification formulas, the greater the displacement bearing capacity value of silicone structural sealant, the smaller the thickness calculation result, and the more cost-effective; In other words, when the thickness value is fixed, the larger the displacement bearing capacity value provided by the structural adhesive manufacturer, the safer the design is. However, according to experience, the best value range of displacement bearing capacity is 8% - 12%. At present, most products of structural adhesive manufacturers are less than 8%, generally between 5% - 8%. Then why can't the maximum displacement tolerance exceed 12? If it is too large, it means that the structural glue is subject to a little wind and grass, which will produce a large displacement, and the curtain wall will also have a great risk

the above is shared by lejun chemical tasani glass adhesive. I hope that users can select products to meet their own needs while referring to the two major categories of standards for curtain wall structural adhesive and the four major properties. If they do not know the performance before use, they can conduct compatibility tests to minimize the impact value

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