How to choose building glue correctly?

Silicone structural sealant is used more and more widely in the building, most of the silicone structural sealant is named according to the application part, and the corresponding products should be selected according to the part when using. Strength requirements, bearing force will need structural adhesive; And sealant to play a sealing role, mainly airtight, watertight, do not need to bear force. In simple terms, structural adhesive force, sealant sealing effect. Therefore, structural adhesive can replace sealant in some conditions, but sealant must not replace structural adhesive. So where should we use sealant?

1. the structure assembly part

The sealant used between the curtain wall panel and its supporting structure needs to bear a variety of loads, and ensure long-term cohesiency, is not allowed to fall off, and must meet the requirements of the national compulsory standard "Building silicone structural sealant" (GB16776). Especially in the high-rise and super high-rise curtain wall, large partition glass curtain wall, the use of laminated hollow glass curtain wall, seismic curtain wall of 9 degrees of fortification area, or even in the combination of these situations, the use of high performance silicone structural sealant. The adhesive has high tensile strength and elongation at break, and can withstand larger loads with the same bond width.

2. Joint parts of building curtain wall panel

The expansion joint between the building curtain wall panel and panel needs to be filled with glue, and silicone weatherproof sealant should be used at this time. It needs to bear the displacement caused by wind load, dynamic load, deformation caused by thermal expansion and contraction of the base material, in the case of tensile or compression, the bond will not be destroyed, but also have a good elastic recovery rate, after the displacement of the panel disappeared, can return to the original state.

3. stone panel parts

Stone panel parts must be made of special stone silicone sealant. Because stone itself is a kind of porous material, easy to be polluted, and it is difficult to clear after pollution. General sealant contains plasticizer and other non-reactive low molecular substances, will migrate from the inside of the rubber to the inside of the stone, oil and dust on the surface of the stone, resulting in stone pollution. This glue is divided into two categories. One is stone sealant, used for sealing between stone plates. The second is dry hanging stone glue, used for bonding between stone and metal hook. In the past, rigid epoxy tree stone dry hanging glue was commonly used. When the building shook, the stress was also transferred to the stone panel, and the stone was easy to be cracked.

4. Lighting top position

Due to its own weight load, snow load, wind load, asymmetric load and material expansion and contraction caused by large and complex displacement, not only horizontal displacement, but also shear displacement. Especially when using polycarbonate board, because of its high coefficient of expansion and contraction, it is six or seven times that of glass. This requires that the sealant has low modulus, high displacement capacity, good with the material, can freely expand, it is best to use 50LM(50 low modulus of magnitude) silicone sealant. Its displacement capacity is plus or minus 50%. Daylighting ceiling glue still asks diaphaneity is good, beautiful and easy.

5.the part between doors and Windows

The gap between the aluminum alloy of doors and Windows and the glass should be filled with a sealant that can be cured at room temperature. After complete curing, the glass and aluminum alloy form a whole. In the past, polyacrylate, neoprene, polyurethane and other filling, or by external force after the bond is easy to damage, or volatile harmful gas. Silicone sealant has no such drawbacks, can play a long-term sealing and waterproof role.