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Viscosity reduction type polycarboxylate superplasticizer with branched side chain and preparation method of viscosity reduction type polycarboxylate superplasticizer
The invention discloses a viscosity reduction type polycarboxylic acid water reducing agent with branched side chains and a preparation method thereof. The water reducing agent is obtained through random copolymerization of a novel comb-shaped macromonomer C and an unsaturated carboxylic acid monomer D according to the mass ratio of 1: (1-6); the novel comb-shaped macromonomer C is prepared by the following steps: firstly copolymerizing a carboxylic acid vinyl ester monomer A and a methoxy-terminated polyoxyethylene ether monomer B to obtain a copolymer, then introducing a reactive hydroxyl group at the tail end of the copolymer through a mercapto alcohol chain transfer agent, and finally carrying out nucleophilic substitution reaction on the hydroxyl group and halogenated olefin. A hydrophobic ester bond structure is introduced into a side chain, so that the HLB (Hydrophile-Lipophile Balance) value of the synthesized polycarboxylate superplasticizer is effectively reduced, and the plastic viscosity of cement paste is favorably reduced; and the multi-branched structure has larger steric hindrance than a single side chain of a conventional polycarboxylate superplasticizer, so that the effects of strong dispersion and high water reduction are achieved.
本发明公开了一种具有支化侧链的降粘型聚羧酸减水剂及其制备方法本发明所述减水剂由新型梳形大单体C与不饱和羧酸单体D按物质的量比为1:1~6通过无规共聚得到；所述新型梳形大单体C首先采用羧酸乙烯酯类单体A与甲氧基封端的聚氧乙烯醚单体B共聚得到共聚物，之后通过巯基醇类链转移剂在共聚物末端引入反应性羟基，最后该羟基与卤代烯烃发生亲核取代反应制备得到。本发明通过在侧链中引入疏水性酯键结构，有效降低了合成的聚羧酸减水剂的HLB值，有利于降低水泥浆体塑性粘度；且多支化结构远比常规聚羧酸减水剂的单根侧链有着更大的空间位阻，从而起到强分散、高减水的作用。
Viscosity reduction type polycarboxylate superplasticizer with branched side chain and preparation method of viscosity reduction type polycarboxylate superplasticizer
The invention discloses a viscosity reduction type polycarboxylic acid water reducing agent with branched side chains and a preparation method thereof. The water reducing agent is obtained through random copolymerization of a novel comb-shaped macromonomer C and an unsaturated carboxylic acid monomer D according to the mass ratio of 1: (1-6); the novel comb-shaped macromonomer C is prepared by the following steps: firstly copolymerizing a carboxylic acid vinyl ester monomer A and a methoxy-terminated polyoxyethylene ether monomer B to obtain a copolymer, then introducing a reactive hydroxyl group at the tail end of the copolymer through a mercapto alcohol chain transfer agent, and finally carrying out nucleophilic substitution reaction on the hydroxyl group and halogenated olefin. A hydrophobic ester bond structure is introduced into a side chain, so that the HLB (Hydrophile-Lipophile Balance) value of the synthesized polycarboxylate superplasticizer is effectively reduced, and the plastic viscosity of cement paste is favorably reduced; and the multi-branched structure has larger steric hindrance than a single side chain of a conventional polycarboxylate superplasticizer, so that the effects of strong dispersion and high water reduction are achieved.
本发明公开了一种具有支化侧链的降粘型聚羧酸减水剂及其制备方法本发明所述减水剂由新型梳形大单体C与不饱和羧酸单体D按物质的量比为1:1~6通过无规共聚得到；所述新型梳形大单体C首先采用羧酸乙烯酯类单体A与甲氧基封端的聚氧乙烯醚单体B共聚得到共聚物，之后通过巯基醇类链转移剂在共聚物末端引入反应性羟基，最后该羟基与卤代烯烃发生亲核取代反应制备得到。本发明通过在侧链中引入疏水性酯键结构，有效降低了合成的聚羧酸减水剂的HLB值，有利于降低水泥浆体塑性粘度；且多支化结构远比常规聚羧酸减水剂的单根侧链有着更大的空间位阻，从而起到强分散、高减水的作用。
Viscosity reduction type polycarboxylate superplasticizer with branched side chain and preparation method of viscosity reduction type polycarboxylate superplasticizer
一种具有支化侧链的降粘型聚羧酸减水剂及其制备方法
HU CONG (author) / YANG YONG (author) / ZHOU DONGLIANG (author) / SHU XIN (author) / HONG JINXIANG (author) / LI SHENZHEN (author) / ZHANG QIANQIAN (author) / LU JIAYUE (author)
2023-07-25
Patent
Electronic Resource
Chinese
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