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缓释型聚羧酸保坍剂的合成与性能研究
作者：叶天驹
（厦门市建筑科学研究院集团股份有限公司，福建 厦门 361004）
摘要：以常规聚醚单体TPEG、丙烯酸（AA）为主要原料，引入新型不饱和小单体甲基丙烯酰氧乙基琥珀酸单酯（MS），在双氧水（HP）-维生素C（Vc）引发体系下，采用常温自由基溶液聚合反应制备缓释型聚羧酸保坍剂PC-1。研究MS、AA、Vc和巯基丙酸（T1）等用量对PC-1性能的影响，并采用红外光谱对合成的PC-1进行结构表征。结果表明，PC-1具有预期的化学结构，PC-1的最佳制备工艺为：m（TPEG）∶m（AA）∶m（MS）＝100∶5∶6，Vc、T1用量分别为大单体质量的0.2%、1.0%。掺PC-1的C30混凝土初始和60、120、180 min坍落度保持性均明显优于同类聚羧酸保坍剂。
关键词：缓释型；聚羧酸保坍剂；琥珀酸酯；性能
中图分类号：TU528.042 文献标识码：A 文章编号：1001-702X（2019）01-0116-04
Research on the synthesis and performance of a sustain-released polycarboxylate slump retaining agent
YE Tianju
（Xiamen Academy of Building Research Group Co. Ltd.，Xiamen 361004，China）
Abstract：Sustain-released polycarboxylate slump retaining agent PC-1 are prepared by free radical solution polymerization at room temperature under the hydrogen peroxide （HP）-vitamin C（Vc） initiation system，while using conventional polyether monomer （TPEG） and acrylic acid（AA） as main raw materials and introducing a new unsaturated small monomer 2-Methacryloyloxyethyl succinate. The effects of the dosage of MS，AA，Vc and T1 on PC-1 performance were discussed. The synthetic polymers are characterized by IR. It shows that the sample of the sustain-released polycarboxylate slump retaining agent has the expected chemical structure. The results show that sustain-released polycarboxylate slump retaining agent had a optimized preparation condition at the mass ratio of TPEG∶AA∶MS=100∶5∶6，Vc and mercaptopropanoic acid was 0.2% and 1% of total mass respectively. The results of C30 concrete test show that slump keeping capacity of PC-1 in initial，60 min，120 min and 180 min are obviously better than those of the same kind of polycarboxylate retaining-agents.
Key words：sustain-released，polycarboxylate slump retaining agent，succinate，performance