萘系高效减水剂添加剂的合成及作用机理研究

为提高萘系高效减水剂的分散稳定性，进行了以顺丁烯二酸聚乙二醇(400，1000)单酯、烯丙基磺酸钠等烯类单体为原料，经共聚合反应合成的聚羧酸型高分子表面活性剂，作为萘系高效减水剂的分散稳定剂的研究。研究了共聚物分子结构中单体种类、相对分子量及侧链长度对水泥净浆分散性及分散稳定性的影响，合成产物对水泥净浆基本无缓凝作用又可使砂浆减水率有所提高、砂浆扩展度保持值亦明显改善；对作用机理进行探讨，认为，掺加了所合成的聚羧酸共聚物的萘系高效减水剂，保留了萘系减水剂对水泥较高的分散性，又赋予水泥颗粒较好的分散稳定性，这是静电斥力与立体效应综合作用的结果。

Synthesis and working mechanism of the additive for beatnaphaline sulfonated-Base supper plasticizer

The study was carried out of carboxylic acid-based copolymer synthesized by vinyl monomers like mono- polyetheylene glycol(400, 1000) and sodium allysulfonate etc. acting as dispersion stability agent for betanaphaline sulfonated based superplastizer for the purpose of improving its dispersion stability. The influence of the chemical structure including types of co-monomers, relative molecular weight and the length of side chain on dispersion ability was investigated, and the obtained copolymer is with minimal setting retardation while maintaining segregation resistance. The mechanism was also discussed in this paper. It showed that the effects of retained high desperating ability and maintaining segregation resistance are the comprehensive results of steric repulsion and electrostatic repulsion.