Basic polymer
The basic polymers used for addition molding liquid silicone rubber mainly include the following two linear polysiloxane containing vinyl. Their molecular weight distribution is wide, generally from thousands to 100000 ~ 200000. The most commonly used basic polymer for addition molded liquid silicone rubber is α,ω- Divinylpolydimethylsiloxane. It is found that the molecular weight and vinyl content of the basic polymer can change the properties of liquid silicone rubber.

crosslinking agent
The crosslinking agent used for addition liquid silicone rubber is organic polysiloxane containing more than three Si-H bonds in the molecule, such as linear methyl hydrogen polysiloxane containing Si-H group, cyclic methyl hydrogen polysiloxane and MQ resin containing Si-H group. The most widely used are linear methyl hydrogen polysiloxanes with the following structures. It is found that the mechanical properties of silicone rubber can be changed by changing the hydrogen content or structure of crosslinking agent. Li Zhichao compared the effects of crosslinking agent (hydrogen containing silicone oil) with different structure and content on the properties of addition liquid silicone rubber. It was found that the hydrogen content of crosslinking agent was proportional to the tensile strength and hardness of silicone rubber. Gu zhuojiang et al. Changed the synthetic process and formula to prepare hydrogen containing silicone oil with different structure, molecular weight and hydrogen content, and used it as crosslinking agent to synthesize addition liquid silicone rubber.

catalyzer
In order to improve the catalytic efficiency of the catalyst, platinum vinyl siloxane complexes, platinum alkynyl complexes and nitrogen-containing compounds modified platinum complexes were prepared. In addition to the type of catalyst, its dosage will also affect the performance of liquid silicone rubber products. Yan and nianping studied the mechanism of the effect of the amount of platinum catalyst on the properties of silicone rubber. They found that increasing the concentration of platinum catalyst can promote the cross-linking reaction between methyl groups and inhibit the decomposition of the main chain.
Reaction inhibitor
It was found that the mass ratio of alkynol inhibitor to platinum catalyst would affect the non isothermal vulcanization kinetic behavior of addition liquid silicone rubber system. The higher the mass ratio of alkynol inhibitor to platinum catalyst, the higher the vulcanization characteristic temperature of addition liquid silicone rubber system. Liu Jin et al. Prepared alkoxysilylated alkyne hydrosilylation inhibitors, which can not only prolong the scorching time of addition liquid silicone rubber, but also make the surface of sulfide smoother. Lei Weihua et al. Found that the liquid addition silicone rubber has the effects of prolonging the inhibition time, shortening the curing time, significantly increasing the torque and faster vulcanization speed.