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Preparation method of novel polycarboxylic acid type water-reducer
The invention discloses a preparation method of a novel polycarboxylic acid type water-reducer. The novel polycarboxylic acid type water-reducer is prepared by the following steps: 1) a unsaturated acid monomer and an amine unsaturated monomer react under the action of a chain transfer agent, an initiator and a reducing agent to obtain a copolymer containing an amino group; 2) excessive diisocyanate is dropwise added into methoxy polyethylene glycol to react under the action of a catalyst so as to obtain methoxypolyethylene glycol mono-isocyanate; 3) the copolymer containing the amino group is added into the methoxypolyethylene glycol mono-isocyanate to react and then pH value is adjusted so as to obtain a novel polycarboxylic acid water-reducer. According to the method, product performance is adjusted by controlling molecular structure/molecular weight of the amine copolymer and molecular weight of methoxy polyethylene glycol. Reactions are fast and efficiency is high. In addition, no organic solvent is used; the water-reducer is nontoxic and pollution-free; and operation is simple. The polycarboxylic acid type water-reducer prepared by the method is a functional polycarboxylic acid type high-efficiency water-reducer, and product performance is stable.
Preparation method of novel polycarboxylic acid type water-reducer
The invention discloses a preparation method of a novel polycarboxylic acid type water-reducer. The novel polycarboxylic acid type water-reducer is prepared by the following steps: 1) a unsaturated acid monomer and an amine unsaturated monomer react under the action of a chain transfer agent, an initiator and a reducing agent to obtain a copolymer containing an amino group; 2) excessive diisocyanate is dropwise added into methoxy polyethylene glycol to react under the action of a catalyst so as to obtain methoxypolyethylene glycol mono-isocyanate; 3) the copolymer containing the amino group is added into the methoxypolyethylene glycol mono-isocyanate to react and then pH value is adjusted so as to obtain a novel polycarboxylic acid water-reducer. According to the method, product performance is adjusted by controlling molecular structure/molecular weight of the amine copolymer and molecular weight of methoxy polyethylene glycol. Reactions are fast and efficiency is high. In addition, no organic solvent is used; the water-reducer is nontoxic and pollution-free; and operation is simple. The polycarboxylic acid type water-reducer prepared by the method is a functional polycarboxylic acid type high-efficiency water-reducer, and product performance is stable.
Preparation method of novel polycarboxylic acid type water-reducer
QIAN SHANSHAN (author) / SHI YU (author) / DING BEI (author) / WANG YI (author) / JIANG HAIDONG (author) / ZHENG CHUNYANG (author)
2015-09-30
Patent
Electronic Resource
English
IPC:
C08G
MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
,
Makromolekulare Verbindungen, anders erhalten als durch Reaktionen, an denen nur ungesättigte Kohlenstoff-Kohlenstoff-Bindungen beteiligt sind
/
C04B
Kalk
,
LIME
/
C08F
MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
,
Makromolekulare Verbindungen, erhalten durch Reaktionen, an denen nur ungesättigte Kohlenstoff-Kohlenstoff-Bindungen beteiligt sind
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