范文编号:CL029 范文字数:10856,页数:22 摘 要:本范文介绍了国内外聚羧酸系混凝土高性能减水剂的研究发展现状,性能特点作用机理及合成方法,对于聚羧酸系高效减水剂的不同合成技术进行了分析。重点通过不同减水剂的合成工艺步骤等分析了减水剂性能的影响因素。如随着烯丙基单体量的减少,减水剂的粘度上升,净浆流动度的保持性也下降,为提高减水剂的性能作为链转移剂的烯丙基单体的量应该越多越好。马来酸酐会使水泥的净浆流动度的保持性下降,并且随着MAn量的增加,减水剂的粘度下降。加入交联剂使减水剂交联,粘度增加,丧失流动性。引入丙烯腈后,随着丙烯腈用量的增加,水泥的初始净浆流动度下降,减水剂的粘度增加。实验制的的减水剂与市售减水剂对比,性能良好,且相对南方水泥而言,对海螺水泥更加适合。 关键词:聚羧酸;高效;减水剂 Abstract: This article describes the system of polycarboxylate superplasticizer concrete's researchs and development status, performance characteristics of the mechanism and synthetic methods, and analyzed polycarboxylate superplasticizer's different synthesis techniques at home and abroad . through different process steps analyzed the synthesis of superplasticizer's affecting factors.such as with the reduction of allyl monomers, the viscosity of superplasticizer increased and the paste fluidity retention also fell, so to enhance the performance of superplasticizer the amount of allyl monomers which as a chain transfer should be the more the better. Maleic anhydride will make the Retention of cement paste fluidity decreased, and with the amount of MAn increase ,the viscosity of superplasticizer decreased. Adding cross-linking agent to cross-linked superplasticizer,it's viscosity will increased, as well as the liquidity losed. After the introduction of acrylonitrile, with the increase of acrylonitrile ,cement's initial paste fluidity dropped ,and the viscosity of superplasticizer increases. Keywords:polycarboxylate ,superplasticizer, synthesis 目 录 混凝土聚羧酸高效减水剂的合成相关范文 |
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