Preparation method of blending modified CPET sheet for high-temperature-resistant oven

The invention discloses the technical field of high polymer materials, and provides a preparation method of a blending modified CPET sheet for a high-temperature-resistant oven, and the blending modified CPET sheet for the high-temperature-resistant oven is composed of the following components, by weight: 100 parts of PET, 5-50 parts of a modified material, 1-6 parts of a phosphate dispersing agent and 1-5 parts of an organic chemical foaming agent. The uniformity index and the mechanical property of a sheet product are effectively improved, inorganic particles or fiber materials are subjectedto ultrasonic dispersion, and the dispersion property of the inorganic particles or fiber materials is improved; meanwhile, when the inorganic particles or fiber materials are blended with PET, the inorganic particles or fiber materials can be rapidly adsorbed to the surface of PET due to the small size and the large specific surface area of PET. Therefore, the prepared sheet product is uniform in mechanical strength, th