Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Preparation method of slump-retaining polycarboxylic acid type water-reducer
The invention discloses a preparation method of a slump-retaining polycarboxylic acid type water-reducer. The preparation method comprises the following steps: 1) a hydroxyl-containing unsaturated monomer, an amine unsaturated monomer, an initiator, a reducing agent and a chain transfer agent are subjected to an oxidation-reduction free radical polymerization reaction to obtain a copolymerization product containing an amino group; 2) excessive sodium hydride is added into methoxypolyethylene glycol to react, epoxy chloropropane is added after the reaction, and desalination is carried out after stirring and reacting so as to obtain epoxy methoxy polyethylene glycol; 3) the copolymerization product containing an amino group is added into the epoxy methoxy polyethylene glycol to react, and pH value is adjusted by alkaline neutralization after the reaction so as to prepare the slump-retaining polycarboxylic acid type water-reducer. According to the method, product performance is adjusted by controlling molecular structure/molecular weight of the copolymerization product containing an amino group and molecular weight of methoxy polyethylene glycol. Reaction is 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 prepared polycarboxylic acid type water-reducer is a slump-retaining polycarboxylic acid type water-reducer, has stable product performance and especially has a good slump-retaining effect on a mud sandy stone material.
Preparation method of slump-retaining polycarboxylic acid type water-reducer
The invention discloses a preparation method of a slump-retaining polycarboxylic acid type water-reducer. The preparation method comprises the following steps: 1) a hydroxyl-containing unsaturated monomer, an amine unsaturated monomer, an initiator, a reducing agent and a chain transfer agent are subjected to an oxidation-reduction free radical polymerization reaction to obtain a copolymerization product containing an amino group; 2) excessive sodium hydride is added into methoxypolyethylene glycol to react, epoxy chloropropane is added after the reaction, and desalination is carried out after stirring and reacting so as to obtain epoxy methoxy polyethylene glycol; 3) the copolymerization product containing an amino group is added into the epoxy methoxy polyethylene glycol to react, and pH value is adjusted by alkaline neutralization after the reaction so as to prepare the slump-retaining polycarboxylic acid type water-reducer. According to the method, product performance is adjusted by controlling molecular structure/molecular weight of the copolymerization product containing an amino group and molecular weight of methoxy polyethylene glycol. Reaction is 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 prepared polycarboxylic acid type water-reducer is a slump-retaining polycarboxylic acid type water-reducer, has stable product performance and especially has a good slump-retaining effect on a mud sandy stone material.
Preparation method of slump-retaining polycarboxylic acid type water-reducer
QIAN SHANSHAN (Autor:in) / SHI YU (Autor:in) / DING BEI (Autor:in) / WANG YI (Autor:in) / JIANG HAIDONG (Autor:in) / ZHENG CHUNYANG (Autor:in)
30.09.2015
Patent
Elektronische Ressource
Englisch
IPC:
C04B
Kalk
,
LIME
Synthetic technology of slump-retaining polycarboxylic type water reducer
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