Title:
METHOD FOR PREPARATION OF POLYISOCYANATE BY PHOTOCHEMICAL REACTION AND METHOD FOR PREPARING WATERBORNE POLYURETHANE RESIN
Document Type and Number:
WIPO Patent Application WO/2021/042251
Kind Code:
A1
Abstract:
The present invention belongs to the technical field of waterborne polyurethane resins, and in particular relates to a method for preparation of a polyisocyanate by a photochemical reaction and a method for preparing a waterborne polyurethane resin. The method for preparation of a waterborne polyurethane resin comprises the following steps: subjecting raw materials including polyisocyanate, an oligomer polyol, a chain extender and a hydrophilic agent to a polymerization reaction to obtain the waterborne polyurethane resin, wherein the content of benzophenone impurities in the polyisocyanate is ≤ 0.045 wt%. By controlling the content of benzophenone impurities during the preparation process of the polyisocyanate, the present invention can effectively improve the resistance to yellowing of a product, and also decreases the harm of unqualified downstream products due to the existence of such impurities in the product.
Inventors:
YU YONG (CN)
SHANG YONGHUA (CN)
LI JIANFENG (CN)
GUO YAOYUN (CN)
WANG TENGFEI (CN)
LI WENBIN (CN)
SUN YE (CN)
WANG QIAO (CN)
LIU DEGANG (CN)
LI YUAN (CN)
SHANG YONGHUA (CN)
LI JIANFENG (CN)
GUO YAOYUN (CN)
WANG TENGFEI (CN)
LI WENBIN (CN)
SUN YE (CN)
WANG QIAO (CN)
LIU DEGANG (CN)
LI YUAN (CN)
Application Number:
PCT/CN2019/104074
Publication Date:
March 11, 2021
Filing Date:
September 02, 2019
Export Citation:
Assignee:
WANHUA CHEMICAL GROUP CO LTD (CN)
WANHUA CHEMICAL NINGBO CO LTD (CN)
WANHUA CHEMICAL NINGBO CO LTD (CN)
International Classes:
C07C263/10; C07C265/14; C08G18/75
Domestic Patent References:
| WO2009077795A1 | 2009-06-25 |
Foreign References:
| CN105218422A | 2016-01-06 | |||
| CN101805272A | 2010-08-18 | |||
| CN109761855A | 2019-05-17 | |||
| CN102070491A | 2011-05-25 | |||
| US5136087A | 1992-08-04 | |||
| CN101811018A | 2010-08-25 | |||
| CN101585903A | 2009-11-25 | |||
| CN103709361A | 2014-04-09 |
Attorney, Agent or Firm:
SINO-CREATIVITY INTELLECTUAL PROPERTY LAW FIRM (CN)
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