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Title:
PROCESS FOR PRODUCING WATER-REDUCING AND SLUMP-RETAINING TYPE POLYCARBOXYLIC ACID
Document Type and Number:
WIPO Patent Application WO/2022/036930
Kind Code:
A1
Abstract:
A process for producing a water-reducing and slump-retaining type polycarboxylic acid. The process comprises the following steps: S1: providing water and a polyether; S2: providing raw materials including three mixtures A, B and C, liquid caustic soda and a catalyst; S3: starting a stirring paddle, and controlling the temperature in a reaction kettle to be between 20ºC and 30ºC throughout the whole production process; S4: sequentially adding part of the mixture A and a certain amount of the liquid caustic soda, such that the pH value of the mixed solution is weakly acidic; S5: adding the catalyst, and simultaneously dropwise adding the remaining mixture A, all the mixture C and part of the mixture B; S6: after the mixture A and mixture C are completely dropwise added, dropwise adding the remaining amount of mixture B; and S7: after the mixture B is completely dropwise added, adding the remaining liquid caustic soda for neutralization until a specified pH value is reached. The present production process can improve the conversion rate so as to reduce the production cost.

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Inventors:
JIN JUNWEI (CN)
WANG MAOLING (CN)
FAN YINGANG (CN)
ZHOU YAO (CN)
XIA HAIYAN (CN)
JIN ZHEN (CN)
ZHU HAIFENG (CN)
Application Number:
PCT/CN2020/133594
Publication Date:
February 24, 2022
Filing Date:
December 03, 2020
Export Citation:
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Assignee:
JIASHAN HUAHAO BUILDING MAT CO (CN)
International Classes:
C04B24/26; C08F283/06; C08F220/06; C08F220/20
Foreign References:
CN109651568A2019-04-19
CN107759744A2018-03-06
CN108864379A2018-11-23
CN111925490A2020-11-13
CN103693881A2014-04-02
US20160130182A12016-05-12
Attorney, Agent or Firm:
BEIJING LINKAW PATENT ATTORNEY LAW FIRM (GENERAL PARTNERSHIP) (CN)
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