Title:
METHOD FOR SYNTHESIZING HYDROLYZED POLYMALEIC ANHYDRIDE
Document Type and Number:
WIPO Patent Application WO/2021/088455
Kind Code:
A1
Abstract:
Disclosed in the present invention is a method for synthesizing hydrolyzed polymaleic anhydride. Specifically, at a temperature of 55-80°C, maleic anhydride is polymerized in an aqueous solution or a molten state by using a single system or a complex system containing an azo water-soluble initiator, so as to synthesize hydrolyzed polymaleic anhydride having a molecular weight of 1000 to 3000. The azo water-soluble initiator can be 2,2'-azobisisobutamidine dihydrochloride, 2,2'-azobis(2-methyl-N-(1,1-dimethylol-2-hydroxyethyl)propionamide), or a complex system thereof with a reducing substance. In the method, a water-soluble azo substance is used as an initiator for initiating double bond polymerization of maleic anhydride at a low temperature, the initiation efficiency is high, the molecular weight of the product is relatively high, the water solubility is good, few by-products are produced, and the yield can reach 95%; and in the method, water is used as a solvent, the reaction conditions are mild, and the decomposition rate of the reaction monomers is low, facilitating industrial production.
Inventors:
CHENG ZHONGFA (CN)
LU JIUTIAN (CN)
WANG YANPING (CN)
SHEN YICHI (CN)
WANG NINGNING (CN)
YANG SHANGWEN (CN)
LU JIUTIAN (CN)
WANG YANPING (CN)
SHEN YICHI (CN)
WANG NINGNING (CN)
YANG SHANGWEN (CN)
Application Number:
PCT/CN2020/109678
Publication Date:
May 14, 2021
Filing Date:
August 18, 2020
Export Citation:
Assignee:
SHANDONG TAIHE WATER TREAT TECH CO LTD (CN)
International Classes:
C08F122/06; C08F2/10; C08F4/04
Domestic Patent References:
| WO2017063188A1 | 2017-04-20 |
Foreign References:
| CN110790851A | 2020-02-14 | |||
| CN1796425A | 2006-07-05 | |||
| CN109293812A | 2019-02-01 | |||
| CN102414132A | 2012-04-11 | |||
| CN102304196A | 2012-01-04 | |||
| CA1274249A | 1990-09-18 |
Attorney, Agent or Firm:
JINAN SPRINGS PATENT&TRADEMARK OFFICE (CN)
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