Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Amphoteric mud-resistant polycarboxylate superplasticizer
The invention discloses an amphoteric mud-resistant polycarboxylate superplasticizer. Unsaturated quaternary ammonium salt monomers are introduced to obtain the amphoteric mud-resistant polycarboxylate superplasticizer. The specific preparation process is as follows: under an oxidation-reduction initiation system, unsaturated carboxylic acid monomers, unsaturated polyether monomers and the unsaturated quaternary ammonium salt monomers are subjected to free radical polymerization reaction in a water phase to obtain the mud-resistant polycarboxylate superplasticizer. The preparation method is simple and easy to implement and stable in process, the cationic quaternary ammonium salt in the synthesized amphoteric mud-resistant polycarboxylate superplasticizer can effectively inhibit expansion of a clay layered structure, water absorbed by clay expansion can be reduced, and the intercalation effect of polyether side chains of the polycarboxylate superplasticizer in the clay layered structure can be reduced; and anionic carboxylic acid in the amphoteric mud-resistant polycarboxylate superplasticizer can form an electrostatic adsorption effect on the surfaces of cement particles, so that the effect of effectively dispersing concrete is achieved. Moreover, the dispersion retentivity and adaptability of the amphoteric mud-resistant polycarboxylate superplasticizer are improved, and the workability of concrete can be effectively improved.
本发明公开了一种两性抗泥型聚羧酸减水剂，通过引入不饱和季铵盐单体，得到两性抗泥型聚羧酸减水剂，具体制备过程如下：在氧化还原引发体系下，不饱和羧酸单体、不饱和聚醚单体、不饱和季铵盐单体在水相中进行自由基聚合反应得到抗泥型聚羧酸减水剂。该制备方法简单易行、工艺稳定，且合成的两性抗泥型聚羧酸减水剂中的阳离子季铵盐，可以有效抑制粘土层状结构的膨胀，既能减少粘土膨胀吸收的水，又能降低聚羧酸减水剂聚醚侧链在粘土层状结构中的插层作用；两性抗泥型聚羧酸减水剂中阴离子羧酸，能够在水泥颗粒表面形成静电吸附作用，达到有效分散混凝土的效果。而且两性抗泥型聚羧酸减水剂的分散保持性和适应性都有提高，能有效改善混凝土和易性。
Amphoteric mud-resistant polycarboxylate superplasticizer
The invention discloses an amphoteric mud-resistant polycarboxylate superplasticizer. Unsaturated quaternary ammonium salt monomers are introduced to obtain the amphoteric mud-resistant polycarboxylate superplasticizer. The specific preparation process is as follows: under an oxidation-reduction initiation system, unsaturated carboxylic acid monomers, unsaturated polyether monomers and the unsaturated quaternary ammonium salt monomers are subjected to free radical polymerization reaction in a water phase to obtain the mud-resistant polycarboxylate superplasticizer. The preparation method is simple and easy to implement and stable in process, the cationic quaternary ammonium salt in the synthesized amphoteric mud-resistant polycarboxylate superplasticizer can effectively inhibit expansion of a clay layered structure, water absorbed by clay expansion can be reduced, and the intercalation effect of polyether side chains of the polycarboxylate superplasticizer in the clay layered structure can be reduced; and anionic carboxylic acid in the amphoteric mud-resistant polycarboxylate superplasticizer can form an electrostatic adsorption effect on the surfaces of cement particles, so that the effect of effectively dispersing concrete is achieved. Moreover, the dispersion retentivity and adaptability of the amphoteric mud-resistant polycarboxylate superplasticizer are improved, and the workability of concrete can be effectively improved.
本发明公开了一种两性抗泥型聚羧酸减水剂，通过引入不饱和季铵盐单体，得到两性抗泥型聚羧酸减水剂，具体制备过程如下：在氧化还原引发体系下，不饱和羧酸单体、不饱和聚醚单体、不饱和季铵盐单体在水相中进行自由基聚合反应得到抗泥型聚羧酸减水剂。该制备方法简单易行、工艺稳定，且合成的两性抗泥型聚羧酸减水剂中的阳离子季铵盐，可以有效抑制粘土层状结构的膨胀，既能减少粘土膨胀吸收的水，又能降低聚羧酸减水剂聚醚侧链在粘土层状结构中的插层作用；两性抗泥型聚羧酸减水剂中阴离子羧酸，能够在水泥颗粒表面形成静电吸附作用，达到有效分散混凝土的效果。而且两性抗泥型聚羧酸减水剂的分散保持性和适应性都有提高，能有效改善混凝土和易性。
Amphoteric mud-resistant polycarboxylate superplasticizer
一种两性抗泥型聚羧酸减水剂
MAO YUCHENG (Autor:in) / FU LEFENG (Autor:in) / FENG ZHONGJUN (Autor:in)
07.12.2021
Patent
Elektronische Ressource
Chinesisch
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