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A platform for research: civil engineering, architecture and urbanism
Micro-crosslinking mud-resistant polycarboxylate water-reducer and preparation method thereof
The invention relates to a micro-crosslinking mud-resistant polycarboxylate water-reducer and preparation method thereof. The preparation method mainly comprises the following steps: complexing Ce < 4+ > in ceric ammonium nitrate with an unsaturated small monomer to form a complexing intermediate, and generating unsaturated small monomer free radicals and Ce < 3 + > from the complexing intermediate; and adopting the unsaturated small monomer free radicals to initiate unsaturated polyether macromonomer and the unsaturated small monomer to carry out aqueous solution free radical copolymerization. Therefore, after the ammonium ceric nitrate is introduced, the unsaturated small monomers not only provide target solid groups adsorbed on cement particles, but also form an initiation system together with the ammonium ceric nitrate, and meanwhile, part of the unsaturated small monomers participating in initiation form bifunctional groups to form cross-linking monomers, so that a micro-cross-linking structure is introduced; due to the added steric hindrance, the water reducer has the properties of high water reduction, good slump loss resistance, good mud resistance and the like. The unsaturated small monomer in the synthesized polycarboxylate water-reducer has a target fixing effect, an initiating effect and a crosslinking effect at the same time, and one monomer has multiple purposes,so that the industrial process is simpler and more controllable, and the cost is lower.
本发明涉及一种微交联抗泥型聚羧酸减水剂及其制备方法，主要是利用硝酸铈铵中Ce4+与不饱和小单体络合形成络合中间体，络合中间体生成不饱和小单体自由基和Ce3+，不饱和小单体自由基引发不饱和聚醚大单体和不饱和小单体进行水溶液自由基共聚。所以引入硝酸铈铵后，不饱和小单体不仅提供吸附于水泥颗粒的靶固基团，还与硝酸铈铵共同组成引发体系，同时部分参与引发的不饱和小单体形成双官能团成为交联单体，引入了微交联结构，其增加的空间位阻使减水剂具有减水高、保坍好、良好的抗泥性等性能。所合成的聚羧酸减水剂中的不饱和小单体同时具有靶固作用、引发作用、交联作用，一种单体多种用途，使工业化过程更简单可控，成本更低。
Micro-crosslinking mud-resistant polycarboxylate water-reducer and preparation method thereof
The invention relates to a micro-crosslinking mud-resistant polycarboxylate water-reducer and preparation method thereof. The preparation method mainly comprises the following steps: complexing Ce < 4+ > in ceric ammonium nitrate with an unsaturated small monomer to form a complexing intermediate, and generating unsaturated small monomer free radicals and Ce < 3 + > from the complexing intermediate; and adopting the unsaturated small monomer free radicals to initiate unsaturated polyether macromonomer and the unsaturated small monomer to carry out aqueous solution free radical copolymerization. Therefore, after the ammonium ceric nitrate is introduced, the unsaturated small monomers not only provide target solid groups adsorbed on cement particles, but also form an initiation system together with the ammonium ceric nitrate, and meanwhile, part of the unsaturated small monomers participating in initiation form bifunctional groups to form cross-linking monomers, so that a micro-cross-linking structure is introduced; due to the added steric hindrance, the water reducer has the properties of high water reduction, good slump loss resistance, good mud resistance and the like. The unsaturated small monomer in the synthesized polycarboxylate water-reducer has a target fixing effect, an initiating effect and a crosslinking effect at the same time, and one monomer has multiple purposes,so that the industrial process is simpler and more controllable, and the cost is lower.
本发明涉及一种微交联抗泥型聚羧酸减水剂及其制备方法，主要是利用硝酸铈铵中Ce4+与不饱和小单体络合形成络合中间体，络合中间体生成不饱和小单体自由基和Ce3+，不饱和小单体自由基引发不饱和聚醚大单体和不饱和小单体进行水溶液自由基共聚。所以引入硝酸铈铵后，不饱和小单体不仅提供吸附于水泥颗粒的靶固基团，还与硝酸铈铵共同组成引发体系，同时部分参与引发的不饱和小单体形成双官能团成为交联单体，引入了微交联结构，其增加的空间位阻使减水剂具有减水高、保坍好、良好的抗泥性等性能。所合成的聚羧酸减水剂中的不饱和小单体同时具有靶固作用、引发作用、交联作用，一种单体多种用途，使工业化过程更简单可控，成本更低。
Micro-crosslinking mud-resistant polycarboxylate water-reducer and preparation method thereof
一种微交联抗泥型聚羧酸减水剂及其制备方法
2020-12-11
Patent
Electronic Resource
Chinese
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