Preparation method of organic silicon modified polyester wire enamel

The invention discloses a preparation method of organic silicon modified polyester wire enamel. Divalent alcohol, trihydric alcohol and dibasic acid are combined into polyester of low polymerization in a molar ratio of 1: (0.08-0.2): (0.95-1); dialkyl dichlorosilane or dialkyl dioxolane silane and alkyl trichlorosilane or alkyl trialkoxysilane are combined into organic silicon resin prepolymer solution; then the organic silicon resin prepolymer solution reacts with resin of low polymerization; and a solvent and a film forming assistant are added to blend into the organic silicon modified polyester wire enamel. The heat-resistant degree of the polyester wire enamel is effectively improved, and production process is simple and reliable; the organic silicon modified polyester wire enamel can be produced at normal pressure and common vacuum degree, and the storage stability of the product is good; and the solvent with small toxicity is used for replacing phenol solvents so as to lower product toxicity.