基于抑制粘土负作用效果的聚羧酸减水剂的设计合成及机理

doi:10.11896/j.issn.1005-023X.2018.22.008

材料导报

2018, Vol. 32

Issue (22): 3880-3884 https://doi.org/10.11896/j.issn.1005-023X.2018.22.008

无机非金属及其复合材料

基于抑制粘土负作用效果的聚羧酸减水剂的设计合成及机理

刘晓, 赖光洪, 许谦, 管佳男, 王子明, 崔素萍, 兰明章

北京工业大学材料科学与工程学院,北京 100124

Synthesis and Mechanism of Polycarboxylate Superplasticizer Based on the Inhibition of Negative Effects of Clay

LIU Xiao, LAI Guanghong, XU Qian, GUAN Jianan, WANG Ziming, CUI Suping, LAN Mingzhang

College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124

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摘要混凝土原材料附带的粘土具有劣化作用,给高性能混凝土的推广与应用带来了新的难题。本研究首次报道了基于粘土和聚羧酸分子尺寸计算自主设计合成的聚羧酸减水剂(PCE)对粘土负作用的改善效果,并结合吸附量、热重(TG)分析和X射线衍射(XRD)分析揭示了其对粘土负作用的抑制机理。计算结果表明,粘土层间吸附的不是整个PCE分子而是其功能性的聚醚侧链。因此针对性地合成了一种立体大尺寸分子结构的PCE,并由核磁氢谱(¹H NMR)和凝胶渗透色谱(GPC)证明了预期结构的存在及其分子量特性。性能评价结果表明,该PCE可在含粘土条件下提高22.2%—35.7%的水泥净浆流动度,并且在高粘土掺量下对混凝土1 h坍落度也有明显改善。这归因于其大尺寸的立体结构能够产生显著的空间位阻效应,避免大分子上的聚醚侧链被全部吸入粘土层间,从而保障优良的减水分散功效,表现出抑制粘土负作用的效果。

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关键词: 粘土负作用聚羧酸减水剂分子结构设计吸附

Abstract: Clay attached in concrete has deterioration effect on the application of high-performance concrete. In this paper, the improvement of polycarboxylate superplasticizer (PCE) synthesized based on the molecular calculation on the negative effect of clay was investigated, and the mechanism was revealed by adsorption, thermal gravimetric (TG) and X-ray diffraction (XRD) measurements. The adsorbed substance between interlayers of clay was side chains rather than the whole PCE, and thus a spatial PCE with large dimension was synthesized followed by ¹H nuclear magnetic resonance (¹H NMR) and gel permeation chromatography (GPC) characterizations. The results showed that in existence of clay, the fluidities of cement pastes containing this PCE increased by 22.2%—35.7%, but also for the 1 h slump of concrete. This is ascribed to its large-sized structure which can generate steric hindrance effect, and thus its side chains can be prevented from being adsorbed in between interlayers of clay to ensure good dispersing effectiveness, presenting an inhibition of negative effect of clay.

Key words: clay negative effect polycarboxylate superplasticizer molecular structure design adsorption

出版日期: 2018-11-25 发布日期: 2018-12-21

ZTFLH:

TU528

基金资助: 国家自然科学基金面上项目(51578025);北京市属高校高水平教师队伍建设支持计划青年拔尖人才培育计划项目(CIT&TCD201804008);北京市自然科学基金(2162007)

作者简介: 刘晓:男,1983年生,博士,副教授,博士研究生导师,主要从事高性能聚合物的分子结构设计合成、高性能混凝土化学外加剂界面吸附化学等研究 E-mail:liux@bjut.edu.cn

引用本文:

刘晓, 赖光洪, 许谦, 管佳男, 王子明, 崔素萍, 兰明章. 基于抑制粘土负作用效果的聚羧酸减水剂的设计合成及机理[J]. 材料导报, 2018, 32(22): 3880-3884.
LIU Xiao, LAI Guanghong, XU Qian, GUAN Jianan, WANG Ziming, CUI Suping, LAN Mingzhang. Synthesis and Mechanism of Polycarboxylate Superplasticizer Based on the Inhibition of Negative Effects of Clay. Materials Reports, 2018, 32(22): 3880-3884.

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http://www.mater-rep.com/CN/10.11896/j.issn.1005-023X.2018.22.008 或 http://www.mater-rep.com/CN/Y2018/V32/I22/3880

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