A SEMI-AROMATIC POLYAMIDE AND THE PROCESS WITH LOW AMOUNT OF WASTE WATER DISCHARGE FOR PREPARING THE SAME

摘要

A semi-aromatic polyamide and the process with low amount of waste water discharge for preparing the same. The semi-aromatic polyamide is obtained as follows: adding aromatic dicarboxylic acid, aliphatic diamine with 4 to 14 carbon atoms and waste water formed from the last prepolymerization to an autoclave to prepolymerize; and subjecting the resulted prepolymer to further polymerization.