混凝土聚羧酸高效减水剂的合成优化

论文编号:CL030  论文字数:10107,页数:21

 摘 要：本论文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。
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
中文摘要 I
英文摘要 II
目录 III
1. 绪论 1
 1.1 聚羧酸盐高效减水剂简介 1
 1.2 定义与分类 2
 1.3 性能特点 3
 1.4 聚羧酸系高性能减水剂的分子结构 3
 1.5 聚羧酸系减水剂的作用机理 4
      1.5.1 空间位阻作用 4
      1.5.2 静电斥力作用 5
      1.5.3 吸附层作用 5
      1.5.4 水化膜润滑作用 5
      1.5.5 引气隔离“滚珠”作用 6
      1.5.6 空位稳定理论 6
 1.6 聚羧酸系减水剂的合成 6
           1.6.1 可聚合单体直接共聚法 6
           1.6.2 聚合后功能化法 6
           1.6.3 原位聚合与接枝 7
2. 实验部分 8
 2.1 实验材料 8
 2.1.1 减水剂的合成材料 8
 2.2 实验设备与仪器 8
     2.2.1 合成步骤的设备与仪器 8
     2.2.2 测试步骤的设备与仪器 8
 2.3 实验工艺步骤 8
     2.3.1 减水剂的制备方法 8
     2.3.2 减水剂的测试方法 9
3. 结果与讨论 11
 3.1 聚醚型减水剂的合成 11
 3.1.1 不同量APEG50打底对减水剂性能的影响 11
 3.1.2 不同量AN对减水剂性能的影响 11
 3.1.3 不同量MAn对减水剂性能的影响 11
 3.1.4 阳离子单体量对减水剂性能的影响 12
 3.1.5 交联剂的影响 12
 3.2 聚酯型减水剂的合成 13
 3.2.1 不同单体的影响 13
 3.2.2 酯化液酸碱性对减水剂性能的影响 13
    3.3 不同减水剂的性能比较 13
4．总结与展望 15
 4.1 总结 15
 4.2 展望 15
致谢 16
参考文献 17