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Preparation method of high-solid-content ester polycarboxylic acid water reducing agent
The invention discloses a preparation method of a high-solid-content ester polycarboxylic acid water reducing agent, which comprises the following steps: (1) mixing polyethyleneglycol monomethyl ether, amino-terminated polyoxypropylene ether, methacrylic acid, a catalyst and a mixed polymerization inhibitor to react to obtain a first mixture; (2) adding unsaturated carboxylate, a cationic monomer and a chain-transfer agent into 70-75 parts of the first mixture, and uniformly mixing to obtain a second mixture; mixing an initiator and acrylic acid to obtain a third mixture; dropwisely adding the third mixture and second mixture into 80-85 parts of the 45-80-DEG C first mixture within 1.5-2 hours, keeping the temperature at 45-80 DEG C to react for 1-1.5 hours, and after the reaction finishes, adding water to regulate the concentration of the system to 80-85%; and (3) adding sodium hydroxide into the material obtained in the step (2) for neutralization to obtain the high-solid-content ester polycarboxylic acid water reducing agent. The method has the advantages of high production efficiency and environment friendliness. The prepared product has excellent properties, and is convenient for storage and line haul.
Preparation method of high-solid-content ester polycarboxylic acid water reducing agent
The invention discloses a preparation method of a high-solid-content ester polycarboxylic acid water reducing agent, which comprises the following steps: (1) mixing polyethyleneglycol monomethyl ether, amino-terminated polyoxypropylene ether, methacrylic acid, a catalyst and a mixed polymerization inhibitor to react to obtain a first mixture; (2) adding unsaturated carboxylate, a cationic monomer and a chain-transfer agent into 70-75 parts of the first mixture, and uniformly mixing to obtain a second mixture; mixing an initiator and acrylic acid to obtain a third mixture; dropwisely adding the third mixture and second mixture into 80-85 parts of the 45-80-DEG C first mixture within 1.5-2 hours, keeping the temperature at 45-80 DEG C to react for 1-1.5 hours, and after the reaction finishes, adding water to regulate the concentration of the system to 80-85%; and (3) adding sodium hydroxide into the material obtained in the step (2) for neutralization to obtain the high-solid-content ester polycarboxylic acid water reducing agent. The method has the advantages of high production efficiency and environment friendliness. The prepared product has excellent properties, and is convenient for storage and line haul.
Preparation method of high-solid-content ester polycarboxylic acid water reducing agent
ZHANG XIAOFANG (author) / FANG YUNHUI (author) / KE YULIANG (author) / ZENG XIANHUA (author) / WU YINCAI (author) / LI GELI (author) / LIN QIAN (author)
2015-11-11
Patent
Electronic Resource
English
SOLID POLYCARBOXYLIC ACID WATER REDUCING AGENT AND PREPARATION METHOD THEREFOR
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