Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Low-sensitivity ester polycarboxylic acid water reducing agent as well as preparation method and application thereof
The invention relates to the technical field of concrete admixtures, in particular to a low-sensitivity ester polycarboxylic acid water reducer as well as a preparation method and application thereof. The preparation method of the low-sensitivity ester polycarboxylic acid water reducing agent comprises the following steps: carrying out esterification reaction on hydroxycinnamic acid and polyethylene glycol, and carrying out free radical polymerization reaction on an obtained esterification monomer, an unsaturated polyester monomer, an unsaturated carboxylic acid monomer and a carboxylic ester monomer. The preparation method is characterized in that an unsaturated polyester monomer, an unsaturated carboxylic acid monomer, an esterification monomer and a carboxylic ester monomer are copolymerized to be introduced into a polycarboxylic acid molecular chain at the same time, an esterification structural unit contains polyhydroxy phenyl and a polyethylene glycol chain segment, a carboxylic ester structural unit contains carboxyphenyl and optional ester groups and carboxylate, and the unsaturated carboxylic acid monomer, the esterification monomer and the carboxylate monomer are copolymerized to form a polycarboxylic acid copolymer. Therefore, the obtained low-sensitivity ester polycarboxylic acid water reducing agent is small in slump and expansion degree gradual loss, and corresponding concrete is free of bleeding and has good mud resistance and workability.
本发明涉及混凝土外加剂技术领域，涉及一种低敏感酯类聚羧酸减水剂及其制备方法和应用。所述低敏感酯类聚羧酸减水剂的制备方法包括以下步骤：将羟基苯丙烯酸与聚乙二醇进行酯化反应，将所得酯化单体与不饱和聚酯单体、不饱和羧酸单体以及羧酸酯单体进行自由基聚合反应。本发明的关键在于将不饱和聚酯单体、不饱和羧酸单体、酯化单体以及羧酸酯单体进行共聚以同时引入聚羧酸分子链上，其中，酯化结构单元既含有多羟基苯基又含有聚乙二醇链段，羧酸酯结构单元中含有羧苯基以及任选的酯基和羧酸盐，如此所得低敏感酯类聚羧酸减水剂不仅坍落度和扩展度经时损失小，而且对应的混凝土无泌水并具有良好抗泥性及和易性。
Low-sensitivity ester polycarboxylic acid water reducing agent as well as preparation method and application thereof
The invention relates to the technical field of concrete admixtures, in particular to a low-sensitivity ester polycarboxylic acid water reducer as well as a preparation method and application thereof. The preparation method of the low-sensitivity ester polycarboxylic acid water reducing agent comprises the following steps: carrying out esterification reaction on hydroxycinnamic acid and polyethylene glycol, and carrying out free radical polymerization reaction on an obtained esterification monomer, an unsaturated polyester monomer, an unsaturated carboxylic acid monomer and a carboxylic ester monomer. The preparation method is characterized in that an unsaturated polyester monomer, an unsaturated carboxylic acid monomer, an esterification monomer and a carboxylic ester monomer are copolymerized to be introduced into a polycarboxylic acid molecular chain at the same time, an esterification structural unit contains polyhydroxy phenyl and a polyethylene glycol chain segment, a carboxylic ester structural unit contains carboxyphenyl and optional ester groups and carboxylate, and the unsaturated carboxylic acid monomer, the esterification monomer and the carboxylate monomer are copolymerized to form a polycarboxylic acid copolymer. Therefore, the obtained low-sensitivity ester polycarboxylic acid water reducing agent is small in slump and expansion degree gradual loss, and corresponding concrete is free of bleeding and has good mud resistance and workability.
本发明涉及混凝土外加剂技术领域，涉及一种低敏感酯类聚羧酸减水剂及其制备方法和应用。所述低敏感酯类聚羧酸减水剂的制备方法包括以下步骤：将羟基苯丙烯酸与聚乙二醇进行酯化反应，将所得酯化单体与不饱和聚酯单体、不饱和羧酸单体以及羧酸酯单体进行自由基聚合反应。本发明的关键在于将不饱和聚酯单体、不饱和羧酸单体、酯化单体以及羧酸酯单体进行共聚以同时引入聚羧酸分子链上，其中，酯化结构单元既含有多羟基苯基又含有聚乙二醇链段，羧酸酯结构单元中含有羧苯基以及任选的酯基和羧酸盐，如此所得低敏感酯类聚羧酸减水剂不仅坍落度和扩展度经时损失小，而且对应的混凝土无泌水并具有良好抗泥性及和易性。
Low-sensitivity ester polycarboxylic acid water reducing agent as well as preparation method and application thereof
一种低敏感酯类聚羧酸减水剂及其制备方法和应用
KE YULIANG (Autor:in) / FANG YUNHUI (Autor:in) / GUO YUANQIANG (Autor:in) / HE CHONG (Autor:in) / ZHANG GENG (Autor:in)
02.04.2024
Patent
Elektronische Ressource
Chinesisch
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