Molded fluorosilicone liquid glue and its preparation method include: the raw material mixture after dehydration, adding vinyl end capping agent and amine glue catalyst for ring-opening polymerization reaction; The amine gel catalyst is then heated to crack to terminate the ring-opening polymerization reaction, wherein the raw material mixture is a mixture of fluorine-containing monomer and methyl cyclosiloxane, or a mixture of fluorine-containing monomer, methyl cyclosiloxane and vinyl methyl cyclosiloxane. The preparation method is easier to control the molecular weight of the liquid adhesive, and the viscosity of fluorine silicone liquid adhesive is in the range of 10--1000Pa. S, which can meet the demand of injection molding process. The catalyst selected in the preparation process can be directly through high temperature pyrolysis, the process is simple and the yield is high. The fluorosilicone rubber obtained by adding and curing the liquid fluorosilicone rubber provided by the invention has excellent physical properties and can be applied to the manufacture and production of seals and gaskets in aircraft and automobiles. The main chain of fluorosilicone rubber is alternately connected by silicon atoms and oxygen atoms, and the side chain contains trifluoropropyl and methyl. It has excellent high and low temperature resistance, weather resistance, oil resistance and solvent resistance.


Add molding fluorosilicone rubber is generally vinyl fluorosilicone oil as a carrier, containing hydrofluorosilicone oil as a crosslinking agent, gas phase method white carbon black as filler, in the presence of platinum catalyst vulcanized into fluorosilicone elastomer, as bonding, sealing, pouring, coating protection materials, can be used in electronics, automotive, aerospace and other fields. Because its base glue is liquid glue, the viscosity is small, easy to automate the production; Its addition vulcanization condition is controllable, can be room temperature, medium temperature, hot vulcanization, and does not release small molecules.


Hot vulcanized fluorosilicone rubber is usually in the action of peroxide, so that the vinyl in the fluorosilicone rubber and hydrogen on the methyl interaction and vulcanization, commonly used vulcanization agents include 2, 4-dichloroperoxybenzoyl (double two four) or 2, 5-dimethyl-2, 5-double (tert-butyl peroxy) hexane (double two five) and so on. The addition of fluorosilicone rubber requires the addition reaction of Si -- H active group and vinyl in the base adhesive and vulcanization. Common hydrofluorosilicone oil has poor compatibility with fluorosilicone base adhesive, so it is necessary to use hydrofluorosilicone oil as a crosslinking agent to improve its compatibility with the base adhesive.