Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Solid four-arm star-shaped polycarboxylate superplasticizer and preparation method thereof
The invention discloses a solid four-arm star-shaped polycarboxylate superplasticizer and a preparation method thereof, and the solid four-arm star-shaped polycarboxylate superplasticizer is prepared by taking a compound containing dithioester at the tail ends of four arms as a chain transfer agent, adopting a reversible addition-fragmentation chain transfer (RAFT) polymerization method, adjusting the pH value after polymerization, and removing a solvent. The star-shaped polycarboxylate superplasticizer provided by the invention takes polypropyleneimine as a core and a polycarboxylate superplasticizer molecular chain with a comb-shaped structure as an arm, the molecular structure is regular and definite, the molecular weight distribution is narrow, the steric hindrance effect of the polycarboxylate superplasticizer in cement particles can be effectively improved, and the star-shaped polycarboxylate superplasticizer is good in dispersity, dispersion retentivity and slump loss resistance.
本发明公开了一种固体四臂星型聚羧酸减水剂及其制备方法，以四臂末端含二硫代酯的化合物作为链转移剂，采用可逆加成—断裂链转移（RAFT）聚合法，聚合后调节pH值，脱除溶剂后制得固体四臂星型聚羧酸减水剂；本发明提供的星型聚羧酸减水剂以聚丙烯亚胺为核，以梳型结构的聚羧酸减水剂分子链为臂，分子结构规整确定，分子量分布窄，能有效提高聚羧酸减水剂在水泥颗粒中的空间位阻作用，分散性和分散保持性良好，保坍性能好。
Solid four-arm star-shaped polycarboxylate superplasticizer and preparation method thereof
The invention discloses a solid four-arm star-shaped polycarboxylate superplasticizer and a preparation method thereof, and the solid four-arm star-shaped polycarboxylate superplasticizer is prepared by taking a compound containing dithioester at the tail ends of four arms as a chain transfer agent, adopting a reversible addition-fragmentation chain transfer (RAFT) polymerization method, adjusting the pH value after polymerization, and removing a solvent. The star-shaped polycarboxylate superplasticizer provided by the invention takes polypropyleneimine as a core and a polycarboxylate superplasticizer molecular chain with a comb-shaped structure as an arm, the molecular structure is regular and definite, the molecular weight distribution is narrow, the steric hindrance effect of the polycarboxylate superplasticizer in cement particles can be effectively improved, and the star-shaped polycarboxylate superplasticizer is good in dispersity, dispersion retentivity and slump loss resistance.
本发明公开了一种固体四臂星型聚羧酸减水剂及其制备方法，以四臂末端含二硫代酯的化合物作为链转移剂，采用可逆加成—断裂链转移（RAFT）聚合法，聚合后调节pH值，脱除溶剂后制得固体四臂星型聚羧酸减水剂；本发明提供的星型聚羧酸减水剂以聚丙烯亚胺为核，以梳型结构的聚羧酸减水剂分子链为臂，分子结构规整确定，分子量分布窄，能有效提高聚羧酸减水剂在水泥颗粒中的空间位阻作用，分散性和分散保持性良好，保坍性能好。
Solid four-arm star-shaped polycarboxylate superplasticizer and preparation method thereof
一种固体四臂星型聚羧酸减水剂及其制备方法
ZHANG YUANYUAN (Autor:in) / LI MINGDONG (Autor:in) / LIU ZHIPENG (Autor:in) / CHEN YANDAN (Autor:in) / LI JINLOU (Autor:in)
21.03.2023
Patent
Elektronische Ressource
Chinesisch
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