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微纳结构对混凝土PTFE超疏水涂层性能影响研究

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为了探究微纳米粗糙结构对水泥混凝土基聚四氟乙烯(PTFE)超疏水涂层性能的影响.研究考虑了混凝土表面的粗糙结构及微米级金刚石、碳化硅、刚玉粉末与纳米级疏水二氧化硅粉末构筑的微纳米粗糙结构.利用接触角测量仪和扫描电子电镜(SEM)对各种粗糙结构下PTFE涂层的湿润性和微观形貌进行了表征.同时,还评价了涂层抗滑性和耐磨耗性.结果表明:两步法制备工艺,先构筑微纳米粗糙结构再修饰PTFE涂层,能获得最强超疏水性能.微米级与纳米级粉末复配使用效果最佳,且随用量增加而增强,推荐比例1:1,粒径比控制在60~120倍间为宜.不同粗糙结构中,金刚石效果最佳,其次是碳化硅和刚玉,混凝土凿毛处理后其抗滑性均满足规范要求,采用湿轮磨耗仪在试件表面往复摩擦1 000次后也均可保持85%以上的疏水性.该研究深入揭示了微纳米粗糙结构对涂层性能的影响机制,可指导实用型高性能PTFE超疏水涂层的制备.
Study on the influence of micro-nanostructures on the performance of PTFE superhydrophobic coatings on cement concrete
In order to investigate the influence of micro-nano rough structures on the performance of polytet-rafluoroethylene(PTFE)superhydrophobic coatings on cement concrete-based substrates,this study considered the rough structures on the concrete surface and the micro-nano rough structures constructed using micrometer-level diamond,silicon carbide,alumina powder,and nanometer-level hydrophobic silica powder.Contact angle measurements and scanning electron microscopy(SEM)were used to characterize the wettability and micro-structure of PTFE coatings on various rough structures.Additionally,the slip resistance and wear resistance of the coatings were evaluated.The results showed that a two-step fabrication process,involving the construction of micro-nano rough structures followed by PTFE coating modification,achieved the highest superhydrophobic performance.The best results were obtained when micrometer-level and nanometer-level powders were com-bined,with the performance improving as the dosage increased,with a recommended ratio of 1:1 and a particle size ratio controlled within the range of 60-120 times.Among different rough structures,diamond showed the best performance,followed by silicon carbide and corundum.After concrete surface treatment with chiseling,all the coatings met the requirements for slip resistance,and after 1000 cycles of reciprocal friction on the test surface using a wet wheel abrasion tester,the superhydrophobicity remained above 85%.This study provides insights into the mechanisms by which micro-nano rough structures affect coating performance and can guide the preparation of practical,high-performance PTFE superhydrophobic coatings.

superhydrophobicmicro-nanoroughstructurespolytetrafluoroethylene(PTFE)fabrication processroad performance

索智、巩梦洋、胡佳恒、邓欣然、闫实

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北京建筑大学土木与交通工程学院,北京 100044

北京未来城市设计高精尖创新中心,北京 100044

北京城市交通基础设施建设工程技术研究中心,北京 100044

超疏水 微纳米粗糙结构 聚四氟乙烯 制备工艺 路用性能

国家重点研发计划

2021YFB2601200

2024

功能材料
重庆材料研究院 中国仪器仪表学会仪表材料学会

功能材料

CSTPCD北大核心
影响因子:0.918
ISSN:1001-9731
年,卷(期):2024.55(4)
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