Two-component addition molding room temperature vulcanized silicone rubber has elastic silicone gel and silicone rubber. The former has lower strength and the latter has higher strength. Their vulcanization mechanism is based on the addition reaction (hydrosilication reaction) of the vinyl group (or propylene group) on the silicone rubber end group and the hydrosilyl group on the crosslinker molecule.

In this reaction, a hydride-functional polysiloxane is used as a cross-linking agent (vulcanizing agent) chloroplatinic acid or other soluble platinum compound is used as a catalyst. The vulcanization reaction proceeds at room temperature. Does not emit by-products. Since no low-molecular matter is released during the cross-linking process, the addition molding room temperature vulcanized silicone rubber does not shrink during the vulcanization process. This type of vulcanizate is non-toxic, high mechanical strength, excellent resistance to hydrolysis (even under high pressure steam), good low compression deformation, low flammability, deep vulcanization, and the speed of vulcanization can be controlled by temperature, etc. Advantages, so it is a class of silicone rubber vigorously developed at home and abroad.

The packaging method of the addition room temperature vulcanized silicone rubber is generally divided into two components: M and N. The catalyst and the vinyl polymer containing a silicone polymer are used as one component. The hydrogen-containing polysiloxane is used as a component. Chaining agents are another component.

The high-strength room temperature vulcanized silicone rubber with high strength is a good material for molding because of its low linear shrinkage and low molecular weight when vulcanized. In the machinery industry, it has been widely used to make molds to cast epoxy resin, polyester resin, polyurethane, polystyrene, vinyl plastic, paraffin, low-melting alloy, coagulation, etc. Utilizing the characteristics of high simulation, non-corrosion, simple molding process and easy demolding, it is suitable for copying cultural relics and fine arts and crafts.