Solid polyester modified silicon resin for heat-resisting powder paints and preparation method thereof

The invention discloses a solid polyester modified silicon resin for heat-resisting powder paints and a preparation method thereof. The solid polyester modified silicon resin for the heat-resisting powder paints is obtained through reaction of a polyester prepolymer and a silicon intermediate, wherein the polyester prepolymer is prepared from trimethylolpropane, neopentyl glycol, phthalic anhydride, trimellitic anhydride and pentaerythritol; the silicon intermediate is prepared from methyltrichlorosilane, dimethyldichlorosilane, phenyltrichlorosilicane, diphenyl dichlorosilane and propylene glycol methyl ether acetate. The solid polyester modified silicon resin for the heat-resisting powder paints is prepared from the optimal raw material composition and ratio obtained by a large number of experiments; by optimizing synthesizing processes, the entire preparation process is reasonable in design and high in operability and synthesizing efficiency; the softening point of the prepared solid polyester modified sil