Liquid silicone rubber is a type of organic silicone rubber compared to mixed semi-solid silicone rubber and common room temperature vulcanized one-component silicone rubber. It is a liquid rubber. This type of rubber has good sulfur mobility, fast vulcanization, and can be cast and injected. forming. Liquid silicone rubber is divided into addition type liquid silicone and condensation type liquid silicone.

     1. Addition liquid silicone rubber: Addition liquid silicone rubber uses vinyl-containing polysiloxane as the base polymer. The viscosity of the rubber compound before vulcanization is low, making it easy to pour and does not release heat during vulcanization. No low molecular by-products are released, the shrinkage rate is small, it can be deeply vulcanized, and the operation is simple. After vulcanization, it becomes a soft, transparent or translucent elastomer, which can maintain elasticity for a long time in the temperature range of -50°C to 200°C. Addition-type liquid silicone is a higher-grade variety of silicone rubber. It has the advantages of vulcanization, and its sealing performance at high temperatures is better than that of the condensation type. It has excellent electrical properties and chemical stability, water resistance, ozone resistance, radiation resistance, weather aging resistance, hydrophobic, moisture-proof, shockproof, good low compression deformation, low flammability; physiologically inert, non-toxic, odorless, and vulcanized The speed can be smoothly controlled using temperature, among other advantages.

   2. Condensation liquid silica gel: The vulcanization reaction of condensation liquid silica gel needs to meet two conditions. It requires moisture in the air and a catalyst to promote the reaction. Usually, the rubber compound and catalyst are packaged separately as one component. Curing begins to occur only when the two components are completely mixed together. The vulcanization time of two-component condensation room temperature vulcanized silica gel mainly depends on the type, dosage and temperature of the catalyst. The more catalyst used, the faster the sulfurization will be, and the shorter the storage time will be. Condensation liquid silicone can be cured at room temperature (25°C) and can become an elastomer after 8 to 24 hours. In order to speed up the process, the amount of curing agent can be increased. The addition or subtraction of curing agent as well as temperature and temperature are all factors that affect the speed of cure.