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:
Feb. 14, 2017
Filed:
Oct. 29, 2013
Zhejiang Nhu Special Materials Co., Ltd., Shangyu, Zhejiang Province, CN;
Zhejiang University, Hangzhou, Zhejiang Province, CN;
Shangyu Nhu Biological Chemical Co., Ltd., Shangyu, Zhejiang Province, CN;
Zhejiang Nhu Company Ltd., Shaoxing, Zhejiang Province, CN;
Zhirong Chen, Hangzhou, CN;
Woyuan Li, Shangyu, CN;
Haoran Li, Hangzhou, CN;
Ming Lian, Shangyu, CN;
Hong Yin, Hangzhou, CN;
Guiyang Zhou, Shangyu, CN;
Xinfeng Zheng, Shangyu, CN;
ZHEJIANG NHU SPECIAL MATERIALS CO., LTD., Shangyu, CN;
ZHEJIANG UNIVERSITY, Hangzhou, CN;
SHANGYU NHU BIOLOGICAL CHEMICAL CO., LTD., Shangyu, CN;
ZHEJIANG NHU COMPANY LTD., Shaoxing, CN;
Abstract
The present invention discloses a fiber-grade polyphenylene sulfide resin synthesis method, taking sodium bisulfide and p-dichlorobenzene as raw materials, N-methyl pyrrolidone as the solvent and C5-C6 fatty acid salt formed through dehydration to C5-C6 fatty acid and sodium hydroxide as the polymerization additive for synthesis through polymerization. White polyphenylene sulfide resin is obtained through acidification and washing of reaction slurry. In view of the fact that MFR is below 125 g/10 min, weight-average molecular weight as measured by GPC is over 4.2×10, and whiteness is over 90, it can satisfy requirements for fiber polyphenylene sulfide resin. C5-C6 fatty acid salt according to the method of the present invention has a higher solubility in NMP, which can better promote polymerization. It is to be fully diverted into the filtrate after filter prior to conversion into free fatty acid again through acidification with hydrochloric acid. C5-C6 fatty acid is available for azeotropy with water, which has a limited solubility in water. Therefore, it is applicable to recycle C5-C6 fatty acid from the filtrate through azeotropy with water, and thereby solve the problem with separation of additive and sodium chloride that are soluble in water.