Insulating glass special sealant has two-component polysulfide sealant , two-component silicone sealant , polyurethane sealant and silicone structural adhesive.
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Use outside the hollow insulating glass sealant as a sealant, as compared with the hollow insulating glass sealants, many shorter life, so to increase the service life of the insulating glass, more attention is necessary in the choice of sealant.
Surrounding glass sealant is to choose a strong bond, more flexible, low water vapor permeability sealant products. For example Jinan Zhono hollow sealant. Promise good sealant hollow glass can be increased structural stability, it fails to extend the cycle, the hollow glass really play a role in energy conservation. Poor hollow insulating glass sealant products cause premature failure of the sealing system, even as leak, water can not be used. Such insulating glass loses both thermal insulation properties and basic performance, and increases replacement costs, resulting in waste of energy and resources.
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The outer sealant of insulating glass must have the following properties: strong adhesion and mechanical strength to inhibit the damage of the sealing system caused by shear displacement; good elastic recovery ability, because the gas in the insulating glass spacer layer will follow If the ambient temperature changes and expands or shrinks, the edge of the glass will be stressed due to deformation. The sealant should have a certain elasticity to avoid glass bursting. At the same time, it must have good elastic recovery ability to maintain the stability of the colloid; Anti-ultraviolet aging ability to extend the life of the insulating glass; should not contain volatile substances that can migrate into the insulating glass spacer layer and chemically attack the butyl rubber and the spacer strip.
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At present, the sealant products used in China's insulating glass mainly include two-component silicone sealant , two-component polysulfide sealant and polyurethane sealant . Silicone sealant has increased its market share in recent years, accounting for about 50% of all sealant usage. Polysulfide sealant accounts for about 25 percent. Polyurethane sealant is small. Other market shares are occupied by products such as composite strips and hot-melt glass glue.
Xingda polysulfide sealant is used in China for many years, more traditional insulating glass sealing products heretics, but the manufacturing cost is higher than silicone gel, market share has declined in recent years.
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