混凝土高效减水剂的合成

论文编号:CL020 论文字数:11571,页数:22

摘要：本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,介绍了聚羧酸类高性能减水剂的分子结构特征及合成方法,对于聚羧酸系高效减水剂的不同合成技术的优缺点进行了分析.认为制备具有聚合活性的大单体的技术是聚羧酸高性能减水剂需要解决的紧迫问题。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MPEG2000系列增加反应过程中的固含量造成减水剂净浆流动度降低，增加了共聚物分子量，不利于聚羧酸系减水剂的性能；APEG25系列中，APEG25单体作打底比作滴加组分更有利于聚羧酸系减水剂的流动性。对于链转移剂量，MPEG2000说明了增加链转移量有利于减水剂的流动性。增加单体浓度对流动性有不利的影响；MPEG系列合适反应温度为65℃；APEG25系列比MPEG2000系列减水剂的流动性和保持性都要好。

关键词：聚羧酸;高效;减水剂

Abstract: TThis cluster of carboxylic acid introduced the research development present stuation, the introduction of carboxylic acid high-performance jianshuiji molecular structure feature and synthetic method for clustering of carboxylic acid and superplasticizer the advantages and disadvantages of different synthesis technology is analyzed. Think big preparation monomer activity has been high technology carboxylic acid water-reducing agent needs to solve urgent problems.the focus through the different steps Superplasticizer synthesis of water-reducing agent such as an analysis of the performance factor. If MPEG2000 series increase the reaction process of solid content slurry flow caused jianshuiji clean, reduce weight, which increased copolymer of clustering performance of carboxylic acid water-reducing agent, APEG25 series, APEG25 monomer as compared to add color to fasten carboxylic acid components together water-reducing agent liquidity. For that, MPEG2000 chain transfer dose volume increases water-reducing agent for the chain of liquidity. Add monomer concentration of liquidity has adverse effects, The MPEG series suitable for 65 ° c, reaction temperature, APEG25 than MPEG2000 series jianshuiji series of liquidity and stable.

Keywords: polycarboxylate, efficient and superplasticizerSynthesis of concrete water reducer

目 录

中文摘要……………………………………………………………………………Ⅰ

英文摘要……………………………………………………………………………Ⅱ

目录…………………………………………………………………………………Ⅲ

1 绪论 …………………………………………………………………………………1

1.1 研究应用的现状与意义………………………………………………………1

1.2 定义与分类……………………………………………………………………3

1.3 性能特点………………………………………………………………………3

1.4 聚羧酸系高性能减水剂的分子结构…………………………………………5

1.5 聚羧酸系减水剂的作用机理…………………………………………………6

1.5.1 空间位阻作用…………………………………………………………6

1.5.2 静电斥力作用…………………………………………………………6

1.5.3 吸附层作用……………………………………………………………6

1.6 聚羧酸系减水剂的合成………………………………………………………7

1.6.1 合成方法………………………………………………………………7

1.6.2 合成控制………………………………………………………………7

2 实验部分 …………………………………………………………………………9

2.1 实验材料………………………………………………………………………9

2.1.1 减水剂的合成材料……………………………………………………9

2.1.2 减水剂的测试材料……………………………………………………9

2.2 实验设备与仪器………………………………………………………………9

2.2.1 合成步骤的设备与仪器………………………………………………9

2.2.2 测试步骤的设备与仪器 ……………………………………………10

2.3 实验工艺 ……………………………………………………………………10

2.3.1 减水剂的制备方法 …………………………………………………10

2.3.2 减水剂的测试方法 …………………………………………………10

3 结果与讨论…………………………………………………………………………12

3.1APEG25系列……………………………………………………………………12

3.1.1MA单体对减水剂的影响………………………………………………12

3.1.2APEG25投料方式的影响………………………………………………12

3.1.3对苯乙烯磺酸钠的影响………………………………………………13

3.2 MPEG2000系列 ………………………………………………………………13

3.2.1反应温度对减水剂性能的影响………………………………………13

3.2.2聚合工艺对减水剂性能的影响………………………………………13

3.2.3链转移剂量的影响……………………………………………………14

3.2.4引发剂量的影响………………………………………………………14

3.2.5单体浓度的影响………………………………………………………14

4 总结与展望…………………………………………………………………………15

致 谢…………………………………………………………………………………16

参考文献………………………………………………………………………………17