The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 16, 2013
Filed:
Jul. 11, 2008
Min Cao, Guangzhou, CN;
Shiyong Xia, Guangzhou, CN;
Xianbo Huang, Guangzhou, CN;
Tongmin Cai, Guangzhou, CN;
Xiangbin Zeng, Guangzhou, CN;
Min Cao, Guangzhou, CN;
Shiyong Xia, Guangzhou, CN;
Xianbo Huang, Guangzhou, CN;
Tongmin Cai, Guangzhou, CN;
Xiangbin Zeng, Guangzhou, CN;
Kingfa Science & Technology Co., Ltd, Guangzhou, CN;
Shanghai Kingfa Science & Technology Co., Ltd, Shanghai, CN;
Abstract
The present invention relates to a semi-aromatic polyamide and a method for preparing it with low wastewater discharge. The semi-aromatic polyamide for the present invention is obtained by introducing aromatic dicarboxylic acid, aliphatic diamine containing 4˜14 carbon atoms and the wastewater generated during the previous prepolymerization into an autoclave for prepolymerization reaction and then further polymerizing the prepolymer. In this preparation method, the wastewater generated during polymerization is recycled, thus greatly reducing the wastewater discharge; the raw materials in the wastewater are effectively recycled, thus improving the utilization rate of raw materials; meanwhile, the diamine in the wastewater compensates that lost along with water discharge during prepolymerization, thus ensuring the Mole ratio balance between dicarboxylic acid monomer and diamine monomer.