For hydrosilane addition reaction, in addition to hydrosilane compounds and unsaturated compounds, the catalyst is an indispensable component, which plays a role in speeding up the reaction speed, shortening the reaction time and reducing the reaction temperature. The catalyst of hydrosilane addition reaction is mainly the compounds and complexes of Group B transition metal elements platinum, palladium, nickel and rhodium in the periodic table, among which platinum catalyst has the highest catalytic activity and is the most widely used.

The platinum catalysts used to catalyze the hydrosilane addition reaction are mainly divided into homogeneous catalysts and heterogeneous catalysts. Among them, the homogeneous catalyst and the reactant are in the same phase, and there is no phase interface. In the reaction of hydrosilane addition, the homogeneous catalyst generally refers to the liquid catalyst.

There are three main homogeneous platinum catalysts: the first is to dissolve chloroplatinic acid (H2PtCl6▪6H2O) into ethanol, isopropyl alcohol and tetrahydrofuran and other organic solvents, so that they interact to form complexes, called "Speier catalyst", this catalyst is simple, quick and easy to use; The second type of platinum catalyst is the complex of platinum and vinyl double head, called Karstedt's catalyst, which has high reactivity, stable storage, and good compatibility with various types of polysiloxanes, and is the most widely used catalyst in the additive silicone release agent; The third type of platinum catalyst is chloroplatinic acid in addition to some other unsaturated compounds to form complexes, but also with ketones, cyclopentadienes, esters, alcohols, crown ethers, heteroatomic crown ethers and polysiloxanes to form complexes as catalysts.


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