1, silicone based polymer

Silicone base polymer, the basic component of liquid silicone rubber, mainly contains two or more silicon-vinyl polydiorganic siloxane. Usually a linear silicone polymer with one vinyl at each end of the polymer chain, or with a small number of silicon-vinyl links in the middle of the polymer chain. The typical base polymer in most use is α,ω -divinylpolydimethylsiloxane, or simply vinylsilicone oil. Vinyl silicone oil is widely used as the base of liquid gel and silicone gel.

2, cross-linking agent

The basic component of liquid silicone rubber is crosslinking agent, which contains three or more silico-hydrogen bonds of organosiloxane oligomers, that is, methyl hydrogen silicone oil with low viscosity.

3. Catalyst

Although there are a variety of catalysts that can trigger the hydrosilylation reaction, the catalysts that can be used to add liquid silicone rubber are only group ⅷ transition metal elements and their compounds or complexes, among which platinum catalysts have the highest catalytic efficiency. The sulfurization reaction of silicone rubber can be catalyzed by using platinum catalyst directly at room temperature. Platinum catalyst for medium temperature vulcanization reaction can be prepared by adding some inhibitors to platinum catalyst.


4. Filling and reinforcing materials

In order to improve the mechanical strength of silicone rubber, it is necessary to add reinforcing filler in the silicone rubber system. The most commonly used filler is the gas phase silica, precipitation silica, quartz powder; If you want to get colorless and transparent silicone rubber, you need to use methyl vinyl MQ silicone resin as transparent reinforcing filler.