Condensed one component liquid silicone rubber
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Condensed single-component liquid silicone rubber is made of hydroxy-terminated polydimethylsiloxane (viscosity 3000-100000 Mpa.s) as basic polymer (commonly known as base glue) and crosslinking agent, catalyst, filler and other characteristics of additives in the isolation of moisture in the mixer mixed evenly, packaged in a sealed cylinder or hose, pressure extrusion when used, Contact with the moisture in the air vulcanized into an elastomer, neither endothermic nor exothermic in the process. The curing time depends on the temperature, humidity and thickness of silica gel.
Condensed one component liquid silicone rubber is widely used as adhesive, sealant and coating material because of its adhesive property. As a adhesive used as one component liquid silicone rubber, vulcanized performance should be in contact with the base material has good adhesion, no corrosion, at the same time has good physical and mechanical properties, electrical properties, so it is best to choose non-corrosive dealcohol-based or deacetone single component silicone rubber. And when choosing one-component silicone sealant, main consideration completely after vulcanization modulus of size, to contact with the substrate adhesion, dynamic durability, surface weather resistance, corrosion of substrate, on the perimeter of the polluting factors, such as, modulus is characterization of sealant mobility parameters, with sealant stretch stress is measured, and sealant grades, The characteristics of typical varieties are described as follows:
(1) One component high modulus type: is the most widely used variety, its curing system has deacetic acid type, deketoxime type, dealcohol-type;
(2) one component low modulus type: adhesion is worse than the above varieties, the use must be in contact with the substrate surface for bottom coating treatment;
(3) plastic sealant: dealcohol-based curing system, used for transparent plastic plate instead of inorganic glass filling joint sealing;
(4) structural sealant: used for the bonding of glass curtain wall of high-rise buildings, its adhesion, durability, fatigue resistance, curing speed and so on have very high requirements, in order to adapt to the wind pressure resistance of components, earthquake resistance and prevent the danger of glass damage or falling in extreme circumstances.