A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
The invention discloses a high-viscosity-reduction type polycarboxylic acid slump retaining agent and a preparation method thereof. The polycarboxylic acid slump retaining agent is composed of the following components: 314-340 parts of a polyether macromonomer, 43-64 parts of alkyl acrylate, 4.5-6.0 parts of sodium hypophosphite, 3.0-5.0 parts of an adhesion promoter, 4.0-7.5 parts of potassium persulfate, 0.6-1.0 part of a reducing agent and the balance being water, wherein the total mass is 1000 parts, and the solid content is about 40%. According to the high-viscosity-reduction type polycarboxylic acid slump retaining agent, free water between a molecular chain and cement particles is discharged by utilizing the hydrophobic characteristic of an ester group structure of a short side chain, the content of the free water in a system is increased, and the viscosity of the system is reduced; the adhesion promoter is used as an anchoring group, the adsorption capacity of strong polar groups such as a phosphate group and a silane structure is higher, and the retention time of the fluidity of concrete is longer.
本发明公开了一种高降粘型聚羧酸保坍剂及其制备方法，所述的聚羧酸保坍剂由以下组分构成：314‑340份聚醚大单体、43‑64份丙烯酸烷基酯、4.5‑6.0份次亚磷酸钠、3.0‑5.0份附着力促进剂、4.0‑7.5份过硫酸钾、0.6‑1.0份还原剂、其余为水，总质量1000份，固含量为40％左右。本发明高降粘型聚羧酸保坍剂利用短侧链的酯基结构的疏水特性排出分子链与水泥颗粒之间的自由水，增加体系中自由水含量降低体系粘度；以附着力促进剂为锚固基团，其磷酸基团、硅烷结构等强极性基团吸附能力更强，混凝土流动度保持时间更久。
The invention discloses a high-viscosity-reduction type polycarboxylic acid slump retaining agent and a preparation method thereof. The polycarboxylic acid slump retaining agent is composed of the following components: 314-340 parts of a polyether macromonomer, 43-64 parts of alkyl acrylate, 4.5-6.0 parts of sodium hypophosphite, 3.0-5.0 parts of an adhesion promoter, 4.0-7.5 parts of potassium persulfate, 0.6-1.0 part of a reducing agent and the balance being water, wherein the total mass is 1000 parts, and the solid content is about 40%. According to the high-viscosity-reduction type polycarboxylic acid slump retaining agent, free water between a molecular chain and cement particles is discharged by utilizing the hydrophobic characteristic of an ester group structure of a short side chain, the content of the free water in a system is increased, and the viscosity of the system is reduced; the adhesion promoter is used as an anchoring group, the adsorption capacity of strong polar groups such as a phosphate group and a silane structure is higher, and the retention time of the fluidity of concrete is longer.
本发明公开了一种高降粘型聚羧酸保坍剂及其制备方法，所述的聚羧酸保坍剂由以下组分构成：314‑340份聚醚大单体、43‑64份丙烯酸烷基酯、4.5‑6.0份次亚磷酸钠、3.0‑5.0份附着力促进剂、4.0‑7.5份过硫酸钾、0.6‑1.0份还原剂、其余为水，总质量1000份，固含量为40％左右。本发明高降粘型聚羧酸保坍剂利用短侧链的酯基结构的疏水特性排出分子链与水泥颗粒之间的自由水，增加体系中自由水含量降低体系粘度；以附着力促进剂为锚固基团，其磷酸基团、硅烷结构等强极性基团吸附能力更强，混凝土流动度保持时间更久。
High-viscosity-reduction type polycarboxylic acid slump retaining agent and preparation method thereof
一种高降粘型聚羧酸保坍剂及其制备方法
2020-04-10
Patent
Electronic Resource
Chinese
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