纳米SiO2改性水性聚氨酯涂料的制备及其对混凝土抗渗性能的影响

龙庆, 黄锦圳, 韦江雄, 余其俊, 胡捷

doi:10.16577/j.issn.1001-1560.2022.0272

材料保护 >

2022 , Vol. 55 >Issue 10: 31 - 36

DOI: https://doi.org/10.16577/j.issn.1001-1560.2022.0272

试验研究

纳米SiO₂改性水性聚氨酯涂料的制备及其对混凝土抗渗性能的影响

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(1.广汽埃安新能源汽车有限公司技术中心，广东广州 510641；2.华南理工大学材料科学与工程学院，广东广州 510641)

胡捷(1980-)，博士，教授，博士生导师，主要从事腐蚀电化学、钢筋混凝土腐蚀与防护和混凝土耐久性方面的研究工作，电话：020-87114137，E-mail：msjiehu@scut.edu.cn

收稿日期: 2022-04-28

修回日期: 2022-05-24

录用日期: 2022-06-21

网络出版日期: 2023-12-23

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Preparation of Nano - SiO₂ Modified Waterborne Polyurethane Coatings and Its Influence on the Anti - Permeability of Concrete

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(1.Technology Department,Gac Aion New Energy Automobile Co.,Ltd.,Guangzhou 510641,China;2.Institute of Materials Science and Engineering,South China University of Technology,Guangzhou 510641,China)

Received date: 2022-04-28

Revised date: 2022-05-24

Accepted date: 2022-06-21

Online published: 2023-12-23

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摘要

为提升水性聚氨酯涂料对混凝土的抗渗性能，首先利用硅烷偶联剂对纳米SiO2进行表面改性,以降低纳米颗粒团聚程度，后将制得的分散性较好的纳米SiO2掺入到水性聚氨酯涂料中。采用热分析(TG)、红外光谱(FT-IR)和动态光散射(DLS)等测试方法分析硅烷偶联剂对纳米SiO2的改性效果，并阐述了纳米SiO2对水性聚氨酯涂料形貌及组成的影响，最后研究了纳米SiO2改性水性聚氨酯涂料对混凝土抗渗性能的影响。结果表明：经硅烷偶联剂改性后的纳米SiO2表面-OH数量减少，团聚程度变小。与刷涂未掺和掺未改性纳米SiO2的聚氨酯涂料的混凝土试件相比，刷涂掺有改性纳米SiO2的聚氨酯涂料的混凝土试件涂层与混凝土之间的附着力提高，试件的单位面积毛细吸水量与氯离子渗透深度降低，混凝土的抗渗性能变好。

关键词： 改性纳米二氧化硅; 硅烷偶联剂; 水性聚氨酯涂料; 混凝土; 抗渗性

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龙庆, 黄锦圳, 韦江雄, 余其俊, 胡捷 . 纳米SiO₂改性水性聚氨酯涂料的制备及其对混凝土抗渗性能的影响[J]. 材料保护, 2022 , 55(10) : 31 -36 . DOI: 10.16577/j.issn.1001-1560.2022.0272

Abstract

For improving the anti-permeability of waterborne polyurethane coatings to concrete,the silane coupling agent was applied to modify the surface of nano-SiO2 to reduce the reunion degree of nanoparticles,and then the modified nano-SiO2 with better dispersibility was added into the waterborne polyurethane coatings.The modification effect of silane coupling agent on nano-SiO2 was analyzed by thermal analysis (TG),infrared spectroscopy (FT-IR) and dynamic light scattering (DLS),and the effect of nano-SiO2 on the morphology and composition of waterborne polyurethane coatings was also expounded.Furthermore,the influence of nano-SiO2 modified waterborne polyurethane coatings on the anti-permeability of concrete was analyzed.Results showed that the nano-SiO2 modified by silane coupling agent possessed less-OH on the surface and a lower reunion degree.Comparing with the concrete specimens painted with the polyurethane coatings containing no SiO2 or unmodified nano-SiO2,the concrete specimen painted with polyurethane coating containing modified nano-SiO2 had stronger adhesion between the coating and the concrete.The capillary water absorption per unit area of the specimen and the penetration depth of chloride ions were reduced,and the permeability resistance of the concrete was improved.

Key words： modified nano-SiO2; silane coupling agent; waterborne polyurethane coating; concrete; permeability resistance

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