| abstract |
The invention discloses a method for recovering waste polyethylene glycol terephthalate, comprising the following steps: heating the waste polyethylene glycol terephthalate to molten state, adding polylol and alcoholysis catalyst to a microwave with 400-800W of power for alcoholysis reaction, thus obtaining a alcoholysis product; heating the alcoholysis product to molten state, adding polylol and alcoholysis catalyst to the microwave with 400-800W of power for esterification reaction, thus obtaining an esterification product. The method is simple in operation and low in cost, the esterification product can be directly used for preparing polyester-epoxide power coating; the method can obtain esterification products with different properties by changing the species and matching of polybasic acid to satisfy different needs. |