1. Silicone structural sealant, as the only connection and load transfer "member" between curtain wall glass and aluminum alloy frame backing, must have quite high tensile and shear strength, resistance to repeated tensile, compression and peel bond strength. It is also necessary to have a high elastic modulus, in the case of high positive and negative stress can still maintain the basic shape of its adhesive layer, to prevent the glass from breaking due to excessive deformation.
2, resistance of silicone sealant is used for hidden frame glass curtain wall of glass or other material seams of a kind of glue, in addition to resist the invasion of the wind and rain, must also adapt to the curtain wall between glass pieces produced by the temperature difference between climate change and heat bilges cold shrink, firm bonding of joint width change is still can, general scaling degree should be allowed to achieve joint width of 25 mm.
Three. Structural sealant for insulating glass is a special adhesive for hidden frame glass curtain wall. It is generally used for insulating glass with aluminum alloy glass curtain wall. Polysulfide glue is used for one-time sealing on the outside of insulating glass. The insulating glass is embedded in the aluminum alloy frame around, and generally does not condense for five years. However, polysulfide adhesive has low bonding strength and is not resistant to ultraviolet light from the sunlight through the glass. There is no aluminum alloy frame shading in the hidden frame curtain wall. The weight and load of the outer glass of insulating glass should be transmitted to the inner glass by insulating glass glue. Therefore, the role of insulating glass silicone structural sealant can not be replaced by polysulfide glue, otherwise, under the effect of negative wind pressure, the outer glass has the danger of falling, so it is impossible to use general glue to replace insulating glass silicone structural sealant.
Four, silicone structure sealant is divided into one component, two components, acid curing adhesive and neutral curing adhesive.