▎ 摘　　要

NOVELTY - Preparing high temperature resistant polyester involves forming graphene dispersant, graphene, ethylene glycol is not more than 1:100, performing shear emulsification to obtain graphene dispersant. The terephthalic acid, ethylene glycol, graphene dispersant, isosorbide, 1,4-cyclohexanedimethanol and additives are added, and then introduced into esterification kettle for esterification, esterification temperature is 230-260 degrees C, pressure is 0.05-0.15 megapascal. The ratio of terephthalic acid, ethylene glycol, isosorbide, 1,4 cyclohexanedimethanol is 4.5-6.0, 3.0-4.0, 1.0-2.0, 0.5-1.5 respectively and includes ethylene glycol in graphene dispersant. The content of the graphene is 0.008-0.01 wt.% of the total mass of ethylene glycol. The assistant is mixture of esterification catalyst, polycondensation catalyst, antioxidant, heat stabilizer and water-carrying agent. The content of each assistant is 0.01-0.1 wt.% of the total mass of the reactants. USE - Method for preparing high temperature resistant polyester. ADVANTAGE - The method enables to prepare high temperature resistant polyester that has simple preparation method. DETAILED DESCRIPTION - Preparing high temperature resistant polyester involves forming graphene dispersant, graphene, ethylene glycol is not more than 1:100, performing shear emulsification to obtain graphene dispersant. The terephthalic acid, ethylene glycol, graphene dispersant, isosorbide, 1,4-cyclohexanedimethanol and additives are added, and then introduced into esterification kettle for esterification, esterification temperature is 230-260 degrees C, pressure is 0.05-0.15 megapascal. The ratio of terephthalic acid, ethylene glycol, isosorbide, 1,4 cyclohexanedimethanol is 4.5-6.0, 3.0-4.0, 1.0-2.0, 0.5-1.5 respectively and includes ethylene glycol in graphene dispersant. The content of the graphene is 0.008-0.01 wt.% of the total mass of ethylene glycol. The assistant is mixture of esterification catalyst, polycondensation catalyst, antioxidant, heat stabilizer and water-carrying agent. The content of each assistant is 0.01-0.1 wt.% of the total mass of the reactants. The above-mentioned esterified product is polycondensed under condition that vacuum degree is not greater than 100 pascal and temperature is 260-290 degrees C to obtain high temperature resistant polyester.