METHOD FOR IMPROVE THE HANDLING HEAT RESISTANCE OF THE ETHYLENE-VINYL ALCOHOL COPOLYMER

摘要

The present invention relates to a method for improve the heat resistance of the ethylene-vinyl alcohol copolymer(EVOH), characterized in that during the preparation of the EVOH, an aqueous solution of a mixture of acetic acid, magnesium dihydrogen phosphate and potassium dihydrogen phosphate can be added in the step of acid treatment after wash to treat the EVOH product, the handling heat resistance of the treated EVOH is improved, and without yellowing due to the high temperature during handling. Further, because the additives can be uniformly dispersed in the EVOH, the heat resistance of the EVOH is also uniform.