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How to choose silicone structural adhesive

Most silicone structural adhesives are named according to the application site, use the site selection of the corresponding products.

Silicone sealant is a one-component, neutral cure designed for structural bond assembly in building curtain walls. Can be easily extruded under a wide range of temperature conditions, relying on moisture in the air to cure into excellent, durable high modulus, high elasticity silicone rubber.

1 structure assembly site. The sealant used between the curtain wall panel and its support structure needs to withstand a variety of loads and to ensure long-term adhesiveness, and does not allow the sealant to fall off. It must meet the requirements of the national mandatory standard "Silicone Sealant for Buildings" (GB16776) . Especially in the high and super high-rise curtain wall, Dah Sing glass curtain wall, the use of insulating glass curtain wall, 9-degree earthquake-proof walls in the area, and even combinations of these situations, but also the need to use high performance silicone structure Sealant. Tensile strength and elongation at break are high, with the same bond width to withstand greater loads.

2 curtain wall construction joints. Expansion joints between the curtain wall panel and the panel need glue to fill, then you should use silicone weather sealant. It needs to withstand the displacement caused by wind load, dynamic load, deformation caused by thermal expansion and contraction of the substrate. In the case of stretching or compression, the adhesion will not be destroyed, and also has a good elastic recovery rate. Panel displacement disappears, can return to its original state. Can refer to the standard "seams glass curtain wall sealant."

3 stone panel parts. Stone panel components must use a special stone silicone sealant. Because the stone itself is a porous material, susceptible to pollution, and difficult to remove after pollution. General sealant containing plasticizers and other non-reactive low-molecular material, will migrate from the interior of the stone to the stone, the oil surface in the stone and vacuum, resulting in stone pollution. This glue is divided into two categories. First, the use of plastic stone joints, for the sealing of the joints between the stone plates. Second, dry hanging stone with plastic, stone and metal for the bond between the hook. In the past often rigid epoxy-based stone dry hanging plastic, building vibration, it will also pass the stress to the stone panels, stone easily shattered. With Silicon Bao's "flexible plastic materials," you can solve this problem.

4 lighting top position. Skylights have large and complicated displacements due to their own weight, snow load, wind load, asymmetric load and thermal expansion and contraction of materials. They not only have horizontal displacement but also shear displacement. In particular, the use of polycarbonate panels, due to its high coefficient of thermal expansion and contraction, is six or seven times the glass. This requires sealant with low modulus, high displacement ability, with good flexibility with the material, can be freely scalable, the best use of 50LM (50 low modulus) silicone sealant. Its displacement capacity of plus or minus 50 %%. Daylighting glue also requires good transparency, nice.

5 parts between windows and doors. Colored aluminum alloy doors and windows of the gap between the glass and the use of room temperature curing sealant filled. After fully cured, the glass and aluminum alloy form a whole. In the past with polyacrylate, neoprene, polyurethane filled, or easily damaged by external adhesion, or volatile gases. Silicone sealant is no such drawbacks, can play a long-term seal, waterproof.