Organic Silicon Hydrogenation Method
Jun 19, 2023
Mix polydiphenylmethylhydrosiloxane with acrylic acid polymer with C=C at n (C=C): n (Si-H)=1:1, and then add 3-methyl-3-trimethylsiloxy-1-butanediol polymerization inhibitor. Hydrosilylation is carried out under pressure PtCl6 • 6H2O to obtain modified products with a solid content of up to 50%~70%. Dilute it with xylene to 80mPa • s (20 ° C) and add it to a stainless steel mold. After crosslinking and curing at 140 ° C for 30 minutes, the coating exhibits good corrosion resistance and durability. Dimethyldiphenylsiloxane, vinyl Trimethoxysilane and acrylic acid Glycidol were subjected to hydrosilylation Addition reaction reaction under the action of chlorolead acid to obtain a siloxane. Toluene and Isobutanol were used as mixed solvents to polymerize this siloxane with styrene Methyl methacrylate butyl acrylate methacrylic acid copolymer solution, and curing agent was added, The coating obtained after coating has good appearance and acid resistance characteristics. Guo Ming and others prepared stable silicone acrylic lotion in lotion through Addition reaction of hydrogen containing polydimethylsiloxane and acrylate monomer. The effects of two feeding methods, namely partial pre emulsified monomer dropping method and partial pure monomer dropping method, on the performance of lotion were systematically studied.
Silicon Hydrogen Addition Method
Hydrosilylation refers to the use of polysiloxane or polysiloxane oligomers containing active hydrogen Si-H bonds to undergo hydrosilylation with (methyl) acrylate and its copolymers containing unsaturated double bonds. Under the action of a catalyst, hydrosilylation is carried out, thereby introducing siloxane into (poly) acrylate molecules. The characteristics of the silicon hydrogen addition method are mild reaction conditions and high yield, and it is suitable to synthesize the desired target product through molecular design. It is widely used in the synthesis of organic silicon polymers. In the organosiloxane molecule, the Electronegativity of silicon is smaller than that of hydrogen, while the Electronegativity of carbon is larger than that of hydrogen, so the hydrogen atom connected to silicon has a negative charge, making the silicon hydrogen bond heat-resistant and quite active, and can undergo Addition reaction with unsaturated bonds in the presence of catalyst.
Several acrylic resins containing different methacryloxypropyl Trimethoxysilane were synthesized by free radical solution polymerization. A cyclic precursor (D1-VTM ()) was synthesized by double bond and hydrosilylation Addition reaction reaction. A new cross-linked plastic organic special mechanical hybrid coating was prepared by the sol gel reaction of the two. The coating has excellent performance.
The research on the Addition reaction of LCAA and PHMS shows that the hydrosilylation of acrylate is mainly carried out by β 1,2 addition becomes the main, followed by a-1,2 addition and 1,4-addition products (cis+trans).
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