Effect of silane modified styrene-acrylic emulsion on the waterproof properties of flue gas desulfurization gypsum

被引：51
作者：
Wu, Qisheng [1 ]
Ma, Hongen [2 ]
Chen, Qiujing [2 ]
Gu, Bin [3 ]
Li, Shuiping [1 ]
Zhu, Huajun [1 ]
机构：
[1] Yancheng Inst Technol, Sch Mat Engn, Yancheng 224051, Peoples R China
[2] Jiangsu Univ, Sch Mat Sci & Engn, Zhenjiang 212013, Jiangsu, Peoples R China
[3] Anhui Univ Sci & Technol, Sch Mat Sci & Engn, Huainan 232001, Peoples R China
来源：
CONSTRUCTION AND BUILDING MATERIALS | 2019年 / 197卷
基金：
中国国家自然科学基金;
关键词：
Flue gas desulfurization gypsum; Waterproofing agent; Silane modification; Styrene-acrylic emulsion; Softening coefficient;
D O I：
10.1016/j.conbuildmat.2018.11.185
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
Silane-modified styrene-acrylic emulsion was prepared with isobutyl acrylate, styrene, methyl methacrylate, vinyltriethoxysilane and long-chain trimethoxysilane. It was used as a waterproofing agent, its effect on the waterproof properties of flue gas desulfurization (FGD) gypsum was studied and the underlying mechanism was analyzed. The results show that when the silane-modified styrene-acrylic emulsion was added at 0.1% by mass, the FGD gypsum had a softening coefficient of 0.72, compressive strength of 9.0 MPa and water absorption rate of 36%. Compared with those of blank sample, the softening coefficient and compressive strength of this FGD gypsum increased by 148% and 18%, respectively, and the water absorption rate decreased by 33%. The waterproofing mechanism of silane-modified styrene-acrylic emulsion was studied by IR, XRD and SEM. It was found that the silane-modified styrene-acrylic emulsion formed a strong hydrophobic film on the surface of the FGD gypsum crystals. This film could inhibit the growth of FGD gypsum crystals, increase the effective overlap between crystals, and increase the water resistance of FGD gypsum. (C) 2018 Elsevier Ltd. All rights reserved.
引用
收藏
页码：506 / 512
页数：7
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