Solvent-free silicone insulating impregnating varnish has a series of advantages such as excellent insulating properties,flow permeability,chemical corrosion resistance,etc.However,its adhesive strength,impact strength and tensile strength are relatively low.In this paper,the modified solvent-free silicone insulation impregnating varnish was obtained by mixing the multifunctional PUA prepolymer with solvent-free silicone insulation impregnating varnish.The influences of the amount of PUA prepolymer with different functional degree on the electrical and mechanical properties of the varnish films were discussed.The results show that the insulation properties of the solvent-free silicone insulating impregnating varnish film modified by PUA6 are the best.When the addition of PUA6 prepolymer is 10%,the mechanical properties of the varnish film are the best.
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