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Preparation method of amine-ester slow-setting polycarboxylic acid type water-reducer
The invention discloses a preparation method of an amine-ester slow-setting polycarboxylic acid type water-reducer. The preparation method comprises the following concrete steps: 1) a unsaturated acid monomer and a hydroxyl-containing unsaturated monomer are subjected to a normal temperature oxidation-reduction free radical polymerization reaction under the action of an initiator, a reducing agent and a chain transfer agent to obtain a hydroxyl-containing copolymerization product; 2) excessive diisocyanate is added into methoxypolyethylene glycol to react under the action of a catalyst so as to obtain methoxypolyethylene glycol monoisocyanate; and 3) the hydroxyl-containing copolymerization product obtained in the step 1) is added into the methoxypolyethylene glycol monoisocyanate obtained in the step 2) to react, and then pH value is adjusted by alkali neutralization so as to obtain the amine-ester slow-setting polycarboxylic acid type water-reducer. According to the method, product performance is adjusted by controlling molecular structure/molecular weight of the hydroxyl-containing copolymerization product and molecular weight of methoxy polyethylene glycol/type of diisocyanate. Reaction efficiency is greatly raised, and reaction time is shortened. In addition, no organic solvent is used; the water-reducer is nontoxic and pollution-free; and operation is simple. The product performance is stable.
Preparation method of amine-ester slow-setting polycarboxylic acid type water-reducer
The invention discloses a preparation method of an amine-ester slow-setting polycarboxylic acid type water-reducer. The preparation method comprises the following concrete steps: 1) a unsaturated acid monomer and a hydroxyl-containing unsaturated monomer are subjected to a normal temperature oxidation-reduction free radical polymerization reaction under the action of an initiator, a reducing agent and a chain transfer agent to obtain a hydroxyl-containing copolymerization product; 2) excessive diisocyanate is added into methoxypolyethylene glycol to react under the action of a catalyst so as to obtain methoxypolyethylene glycol monoisocyanate; and 3) the hydroxyl-containing copolymerization product obtained in the step 1) is added into the methoxypolyethylene glycol monoisocyanate obtained in the step 2) to react, and then pH value is adjusted by alkali neutralization so as to obtain the amine-ester slow-setting polycarboxylic acid type water-reducer. According to the method, product performance is adjusted by controlling molecular structure/molecular weight of the hydroxyl-containing copolymerization product and molecular weight of methoxy polyethylene glycol/type of diisocyanate. Reaction efficiency is greatly raised, and reaction time is shortened. In addition, no organic solvent is used; the water-reducer is nontoxic and pollution-free; and operation is simple. The product performance is stable.
Preparation method of amine-ester slow-setting 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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