Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
PREPARATION METHOD OF POLYISOCYANATE
Document Type and Number:
WIPO Patent Application WO/2020/097950
Kind Code:
A1
Abstract:
Disclosed is a method for preparing polyisocyanate. A self-polymerization reaction of isocyanate is carried out using a fluorine-containing catalyst as a catalyst. After the reaction is completed, a fluorine-containing terminator is added to terminate the reaction and to obtain a reaction solution. The reaction solution of the terminated reaction is cooled to -30°C to 30°C and is subjected to an adsorption or filtration treatment using a fluorine-containing material. Unreacted isocyanate monomers are removed to obtain polyisocyanate. The fluorine content in the polyisocyanate is controlled to be no greater than 80 ppm. This method controls the fluorine content in the product and avoids turbidity when the product is stored at low temperature.

Inventors:
LIU WEI (CN)
SHI BIN (CN)
SHANG YONGHUA (CN)
WANG MINGYONG (CN)
ZHU ZHICHENG (CN)
XIN GUANGZHEN (CN)
XUE YONGYONG (CN)
CHEN JIE (CN)
SUN YE (CN)
LI YUAN (CN)
Application Number:
PCT/CN2018/116362
Publication Date:
May 22, 2020
Filing Date:
November 20, 2018
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
WANHUA CHEMICAL GROUP CO LTD (CN)
WANHUA CHEMICAL NINGBO CO LTD (CN)
International Classes:
C08G18/79; C07D251/34; C07D273/04; C08G18/02
Foreign References:
CN103987750A2014-08-13
CN103987750A2014-08-13
CN105566239A2016-05-11
CN105566239A2016-05-11
CN102964566A2013-03-13
CN1757639A2006-04-12
CN1243124A2000-02-02
Attorney, Agent or Firm:
BOSS & YOUNG PATENT AND TRADEMARK LAW OFFICE (CN)
Download PDF: