微交联降粘型聚羧酸减水剂的合成及其在低水胶比体系中的作用

doi:10.11896/cldb.20090167

材料导报

2022, Vol. 36

Issue (9): 20090167-8 https://doi.org/10.11896/cldb.20090167

高分子与聚合物基复合材料

微交联降粘型聚羧酸减水剂的合成及其在低水胶比体系中的作用

陈景¹, 杨长辉^1,*, 高育欣², 杨文², 王福涛², 刘明², 曾超²

1 重庆大学材料科学与工程学院,重庆 400045
2 中建西部建设建材科学研究院有限公司,成都 610000

Synthesis of Slightly Cross-linked Viscosity-reducing Polycarboxylate Superplasticizer and Its Influence on Cement Paste with Low Water-Binder Ratio

CHEN Jing¹, YANG Changhui^1,*, GAO Yuxin², YANG Wen², WANG Futao², LIU Ming², ZENG Chao²

1 College of Materials Science and Engineering, Chongqing University, Chongqing 400045, China
2 China West Construction Academy of Building Materials Co.,Ltd., Chengdu 610000, China

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摘要根据分子结构设计原理,以过硫酸铵为引发剂,以异戊烯醇聚氧乙烯醚、丙烯酸、马来酸酐、甲基丙烯酸二甲氨乙酯、不饱和酯和交联剂为主要原料,合成了一系列的微交联聚羧酸减水剂(WJN)。通过红外光谱仪、核磁氢谱、凝胶色谱仪和动态光散射对其结构进行表征,对比研究了梳型和微交联型聚羧酸减水剂的表面张力、分散性能、Marsh时间、流变行为、水膜层厚度、吸附行为以及新拌混凝土工作性能等。结果表明,当水胶比(w/c)为0.20时,相同流动度下,相比梳型(PCE-1)聚羧酸减水剂,WJN的掺量和Marsh时间分别降低20%和40%以上,浆体屈服应力和同转速下的剪切粘度分别降低45%和50%以上。混凝土实验表明,与PCE-1相比,掺入WJN后,混凝土掺量、倒坍时间和T500分别降低10%、65%和55%以上,即带有支化结构的聚羧酸减水剂具有优异的降粘性能。

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	陈景
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	曾超

关键词: 孔隙液粘度降粘型聚羧酸减水剂水膜层厚度分散性能流变行为

Abstract: Asuperplasticizer was synthesized by isobutyl alcohol polyoxyethylene ether, acrylic acid, maleic anhydride, 2-(dimethylamino)ethyl methacrylate, unsaturated ester, crosslinking agent and potassium persulfate according to the molecular structure design principle. The molecular structure of superplasticizer was determined by Fourier infrared spectroscopy,¹H nuclear magnetic resonance, gel permeation chromatography and dynamic light scattering, respectively. The surface tension, dispersion performance, Marsh time, rheological behavior, water film thickness, adsorption behavior and application performance of fresh concrete of comb-type and micro-crosslinked superplasticizer were comparatively stu-died. Compared with the dosage and Marsh time of PCE-1, those of WJN were reduced by more than 20% and 40%, with the yield stress of the cement paste and the shear viscosity reduced by 45% and 50%, respectively, at the water-binder ratio (w/c) of 0.20 under the same fluidity. The concrete results show that the dosage, slump time and T500 were reduced by more than 10%, 65% and 55%, respectively. Therefore, the superplasticizer of branched structure has good viscosity-reducing effect.

Key words: pore solution viscosity viscosity-reducing polycarboxylate superplasticizer water film thickness dispersion performance rheological behavior

出版日期: 2022-05-10 发布日期: 2022-05-09

ZTFLH:

TU528.042

基金资助: 国家自然科学基金(51878102);十三五国家重点研发计划(2017YFB0309905);重庆市自然科学基金(cstc2018jcyjAX0403)

通讯作者: ychh@cqu.edu.cn

作者简介: 陈景,重庆大学博士研究生,主要从事高性能混凝土、混凝土外加剂、混凝土耐久性及相关材料的研究与开发工程。
杨长辉,重庆大学教授,博士研究生导师,主要从事碱性胶凝材料及其混凝土、固体废渣处置和利用及建筑节能等方面的研究。先后主持和参加国家、省部级项目27项,横向科研项目50余项;发表学术论文100余篇,被SCI、EI和ISTP检索30余篇;主持和参编国家、行业和地方标准7部;获省部级科技进步奖3项。

引用本文:

陈景, 杨长辉, 高育欣, 杨文, 王福涛, 刘明, 曾超. 微交联降粘型聚羧酸减水剂的合成及其在低水胶比体系中的作用[J]. 材料导报, 2022, 36(9): 20090167-8.
CHEN Jing, YANG Changhui, GAO Yuxin, YANG Wen, WANG Futao, LIU Ming, ZENG Chao. Synthesis of Slightly Cross-linked Viscosity-reducing Polycarboxylate Superplasticizer and Its Influence on Cement Paste with Low Water-Binder Ratio. Materials Reports, 2022, 36(9): 20090167-8.

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http://www.mater-rep.com/CN/10.11896/cldb.20090167 或 http://www.mater-rep.com/CN/Y2022/V36/I9/20090167

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