Method for preparing PET film from waste PET material

The invention belongs to the technical field of waste recycling, and particularly relates to a method for preparing a PET film from a waste PET material. According to the invention, waste PET is usedas a basic material; by mixing a solvent, on one hand, the material can be dissolved; on the other hand, impurities can be removed. Then, a primary reaction is carried out through the mixture; trace new PET is formed, and waste is combined; under the high-temperature and high-pressure action, degradation is performed and the molecular weight is reduced to form micromolecular PET; meanwhile, gas making is conducted by using an auxiliary agent to make new PET enter the waste; then, silane polymerization is performed to form a polymer, and the polymer is modifed to improve the performance; and finally through the use of a catalyst, macromolecular PET is formed to improve the performance. 本发明属于废弃物再利用技术领域，具体涉及一种利用废旧PET材料制备PET薄膜的方法。本发明以废弃PET作为基础原料，通过混合溶剂，一是可以将其进行溶剂，二是可以起到除杂，随后通过混合料进行初步反应，形成微量新的PET，与废弃进行结合，利用高温高压作用下，进行降解