二步法合成聚羧酸盐高效减水剂的研究

化工论文编号:HG195  论文字数:11802,页数:25

目录
中文摘要 Ⅰ
英文摘要 Ⅱ
目录 III
1 绪 言 1
1.1 选题的背景与意义 1
1.2  文献综述 2
1.2.1 减水剂的发展及研究概况 2
1.2.2分子结构设计及其优点 3
1.2.3二步法合成聚羧酸盐高效减水剂的作用机理 4
1.2.4 二步法合成聚羧酸盐高效减水剂和水泥的相容性 5
2 实验部分 6
2.1试验材料 6
2.1.1 合成减水剂原料和试剂 6
2.1.2 水泥净浆试验材料 6
2.2  实验设备 6
2.3  合成工艺流程 7
2.4 二步法合成聚羧酸高效减水剂的合成方法 7
2.4.1 第一步:大单体的合成 7
2.4.2 第二步:减水剂的合成 7
2.4.3 减水剂含固量的测定 8
2.4.4 水泥净浆流动度的测试 8
3  结果与讨论 9
3.1 不同厂家生产的MPEG对减水剂性能的影响 9
3.2引发剂用量的影响 9
3.3混合聚醚为原料制备的减水剂的性能比较 11
3.4引入PPG对水泥净浆流动度的影响 12
3.5 MAn替代部分MAA的影响 12
3.6不同减水剂产品的性能对比 13
3.7与萘系减水剂性能比较 15
3.7.1二步法合成聚羧酸盐高效减水剂与萘系减水剂性能比较 15
3.7.2二步法合成聚羧酸盐高效减水剂与萘系减水剂混凝土对比实验 15
4 总结与展望 17
4.1 总结 17
4.2 未来展望 17
致  谢 19
参考文献 20

摘要：本文简要的叙述了研究二步法合成聚羧酸盐高效减水剂这个课题的内容及其意义，介绍了近年来国内外二步法合成聚羧酸盐高效减水剂发展现状、从本质上分析了二步法合成聚羧酸盐高效减水剂的作用机理等。简单的描述了二步法合成聚羧酸盐高效减水剂合成方法、工艺方案及实验检测方法，并对实验从实验原料的选择，引发剂对减水剂性能的影响，比较了混合聚醚为原料制备的减水剂的性能，引入PPG后能否起到消泡功能，寻求MAA的替代品及与国内外同系列产品比较、与萘系减水剂之间的比较及混凝土实验等这几个方面进行了数据整理、比较及分析。然后针对实验数据，作出了一些结论性的分析。最后对全文进行总结，并提出今后研究的方向及对二步法合成聚羧酸盐高效减水剂一些展望。
关键词：二步法合成；聚羧酸；减水剂；MPEG；水泥净浆流动度

Abstract：This paper described the research of two-step synthesis of polycarboxylic superplasticizer, the contents of the subject and its significance briefly，and introduced the development of two-step synthesis of polycarboxylic superplasticizer in recent years at home and abroad ,and analyzed the mechanism of superplasticizer in essence. Moreover, it described the synthesis methods, techniques and experimental characterizaton method of two-step synthesis of polycarboxylic superplasticizer. Some data processing, comparison and analysis through the experimental materials from the choice experiment were made. The effect of initiator dosage, preparation from  different mixed polyoxyethylenes for cement fluidity , PPG introduced after they played an antifoaming function , MAA seeking alternatives were investigated. The comparison among the aphthalene superplasticizer, polycarboxylic superplasticize with two-steps synthesis and a series of comparative products at home and abroad was made through concrete experiment. Then, some concluding analysis from experimental data was made. Finally，the paper was summarized, and some prospects of future research directions to two-step synthesis of polycarboxylic superplasticizer was proposed.
Keywords: two-step synthesis; polycarboxylic; superplasticizer; MPEG; cement fluidity