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二步法合成梳形混凝土超塑化剂的研究

论文编号:HG189 论文字数:12322,页数:24

摘 要:随着混凝土高性能化的不断深入发展,超塑化剂成为提高混凝土性能必不可少的组份,是对混凝土性能影响比较大的组份。超塑化剂是指在保持混凝土坍落度基本相同的条件下能大幅度减少拌和用水量的外加剂。聚丙烯酸超塑化剂具有强度高、耐热性、耐久性、耐候性等优异性能,正是由于聚丙烯酸超塑化剂的这些优良特性而使它成为世界性的研究热点。本文通过对聚羧酸型超塑化剂的制备合成及性能测试的研究,主要侧重于研究大单体的合成原料、塑化剂的合成方法、引发剂比例、MPEG的产地以及MPEG分子量不同等因素对塑化剂产品分散性能的影响。通过对比试验,比较聚羧酸系塑化剂和萘系塑化剂的性能,并对结果进行了讨论。综述了新型超塑化剂的研究现状,提出超塑化剂在研究与应用方面的发展方向。

关 键 词: 聚羧酸系超塑化剂;流动度; MPEG作用机理;分子结构设计;

Abstract: With the in-depth development of high-performance concrete superplasticizer become essential components to improve the performance of concrete. Superplasticizer refers to the chemical additive which can enhance the slump highly and maintain it for a long time while it can significantly reduce water consumption of mixing additives. Polyacrylic acid superplasticizer have such advantages as high strength, heat resistance, durability, antiweather ability, and other excellent performance. Because of these good characteristics of polyacrylic acid superplasticizer it becomes a global hotspot of superplasticizer field. Based on polycarboxylate type superplasticizer preparation and test of the product properties, this paper focused mainly on studying the effects of the macromonomer synthesis, superplasticizers synthesis method, MPEG origin, the MPEG molecular weight and molecular weight distribution and other factors on the product performances. By comparing the test results, the performances of polycarboxylic plasticizers and Naphthalene plasticizing agent are discussed. Summary of new superplasticizers with higher performances in the future research, and the direction to the development of them were proposed.

Keywords: polycarboxylic superplasticizer;fluidity;MPEG mechanism; molecular structure design.

目 录

中文摘要Ⅰ

英文摘要Ⅱ

目 录III

1. 绪论1

1.1 课题研究内容及意义1

1.2 文献综述2

1.2.1 塑化剂的发展概况2

1.2.2聚羧酸系超塑化剂的作用机理4

1.2.3 国内外聚羧酸系超塑化剂的研究进展5

1 聚羧酸系超塑化剂的研究概况5

2 聚羧酸系超塑化剂的分子结构设计6

3 聚羧酸系超塑化剂合成方法7

4 聚羧酸系超塑化剂研究中的几个问题8

2. 实验部分11

2.1 试验材料11

2.1.1 合成塑化剂原料和试剂:11

2.1.2 水泥净浆试验材料:11

2.2 实验设备11

2.3 合成工艺流程12

2.4 实验方法12

2.4.1 第一步 大单体的合成12

2.4.2 第二步 塑化剂的合成12

2.4.3 塑化剂含固量的测定13

2.4.4 水泥净浆流动度的测试13

3. 结果与讨论14

3.1不同分子量的MPEG对产物分散性能的影响14

3.2不同产地的MPEG对产物分散性能的影响14

3.3 不同的聚醚混合对产物分散性能的影响15

3.4 引发剂对产物分散性能的影响16

3.5 PPG对产物分散性能的影响17

3.6聚羧酸系超塑化剂与萘系塑化剂性能比较18

4.总结与展望19

4.1 总结19

4.2 展望19

致 谢20

参考文献:21

二步法合成梳形混凝土超塑化剂的研究......