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How to choose silicone structural adhesive

2021-09-07  From: Shandong Lechao New Material Technology Co., LTD Browsing times:33

Most silicone structural adhesives are named according to the application part, and the corresponding products should also be selected according to the part.

Silicone sealant is a kind of one component, neutral curing and structural bonding assembly in building curtain wall. It can be easily extruded under a wide temperature condition, and can be cured into a relatively good and durable silicone rubber with high modulus and high elasticity by relying on the moisture in the air.

1. Structural assembly position. The sealant used between the curtain wall panel and its supporting structure needs to bear a variety of loads and ensure long-term adhesion. It is not allowed to fall off. It needs to meet the requirements of the mandatory standard silicone structural sealant for building (gb16776). It is necessary to use silicone structural sealant with high performance on high-rise and super high-rise curtain walls, large lattice glass curtain walls, curtain walls using laminated insulating glass, curtain walls in seismic fortification areas of 9 degrees, and even in the combination of these situations. This adhesive has high tensile strength and elongation at break, and can bear relatively large load with the same bonding width.

2. Construction curtain panel joints. The expansion joint between the building curtain wall panel and the panel needs to be filled with glue. At this time, silicone weather resistant sealant should be used. It needs to bear the displacement caused by the deformation caused by wind load, dynamic load and thermal expansion and cold contraction of the substrate. In the case of tension or compression, the adhesion will not be damaged, and it also has a good elastic recovery rate. After the displacement of the panel disappears, it can return to the original state. Refer to the standard joint sealant for curtain wall glass.

3. Stone panel. Stone panel components need to use stone silicone sealant. Because the stone itself is a porous material, it is easy to be polluted, and it is difficult to remove after pollution. The general sealant contains non reactive low molecular substances such as plasticizer, which will migrate from the interior of the sealant to the interior of the stone, and there will be oil dirt on the stone surface and dust collection, resulting in stone pollution. This glue is divided into two categories. One is the glue for stone joint filling, which is used for joint filling and sealing between stone plates. The second is dry hanging stone glue, which is used for bonding between stone and metal hook. In the past, rigid epoxy tree stone was commonly used for dry hanging glue. When the building vibrates, the stress is also transmitted to the stone panel, and the stone is easy to crack. This problem can be solved by using the "elastic stone dry hanging glue" of Sibao company.

4. Lighting roof. The displacement of daylighting roof caused by its own weight load, snow load, wind load, asymmetric load and material thermal expansion and cold contraction is large and complex, including not only horizontal displacement, but also shear displacement. Especially when polycarbonate plate is used, its coefficient of thermal expansion and cold contraction is very high, which is 60% or 70% of that of glass. This requires the sealant to have low modulus, high displacement capacity, good adaptability to materials, free expansion and contraction, and it is better to use 50lm (50 low mold level) silicone sealant. Its displacement capacity is plus or minus 50%. The daylighting ceiling glue also requires good transparency and elegant appearance.

5 parts between doors and windows. The gap between aluminum alloy and glass of color aluminum alloy doors and windows shall be filled with room temperature curable sealant. After curing, the glass and aluminum alloy form a whole. In the past, filling with polyacrylate, neoprene, polyurethane, etc. was easy to damage after external force, or volatilized harmful gas. Silicone sealant has no such disadvantages and can play a sealing and waterproof role.

Keywords: How to choose silicone structural adhesive