基于SiO2/芳纶纳米纤维"葡萄"结构的耐磨超疏水涂层的制备与性能
Preparation and properties of wear-resistant superhydrophobic coatings based on SiO2/aramid nanofibers"grape"structure
张炜亮 1邓莉 1张田田 1黄亚文 2王树民 2胡程耀 1陈俊3
作者信息
- 1. 西南科技大学 材料与化学学院,绵阳 621010;西南科技大学生物质材料教育部工程研究中心,绵阳 621010
- 2. 西南科技大学 材料与化学学院,绵阳 621010;环境友好能源材料国家重点实验室(西南科技大学),绵阳 621010
- 3. 绵阳麦思威尔科技有限公司,绵阳 622651
- 折叠
摘要
超疏水材料由于其超高的防水性在工业防腐等领域展现出巨大的应用前景,然而在实际使用过程中,涂层表面的微纳结构和低表面能物质会被不断损耗从而影响超疏水性能.本文主要以聚多巴胺(PDA)包裹的芳纶纳米纤维(ANFs)作为一种微纳米构筑单元,在其上通过溶胶凝胶法原位生长纳米SiO2,并通过对其进行低表面能改性构建"葡萄"形超疏水结构,最后通过"粘接剂-超疏水粒子"喷涂得到超疏水涂层.当正硅酸乙酯(TEOS)添加量为 2.1wt％时,超疏水涂层的接触角(WCA)为 158°±1.5°.所制得的涂层具有良好的力学性能,在分别经过 200 g砝码在 25 μm砂纸下的 240 次磨损和 400 g砂冲实验的条件下,仍能保持良好的超疏水性能.Nyquist测试表明样片阻抗弧明显变大,Tafel测试表明腐蚀电位正移,喷涂超疏水涂层后能够有效提升防腐性能.
Abstract
Hydrophobic materials have shown great potential in industrial corrosion prevention due to their extremely high waterproofing properties.However,in practical applications,the micro-nano structure and low surface energy of the coating surface are continuously worn away,affecting the superhydrophobic performance.This study focuses on using polydopamine(PDA)coated aramid nanofibers(ANFs)as micro-building units to grow nano-SiO2 through sol-gel condensation and construct a"grape-like"superhydrophobic structure through low surface energy modification.Finally,a superhydrophobic coating is obtained by spray-coating with a"binder-super-hydrophobic particles"mixture.When the ethyl orthosilicate(TEOS)addition is 2.1wt％,the contact angle of the superhydrophobic coating is 158°±1.5°.The resulting coating exhibits good mechanical properties and maintains its superhydrophobic performance even after undergoing 240 cycles of abrasion on 25 μm sandpaper with a 200 g weight and a sand erosion test with a 400 g load.Nyquist testing shows a significant increase in impedance arc,and Tafel testing indicates a positive shift in corrosion potential,demonstrating that the spray-coated superhydro-phobic coating can effectively enhance corrosion resistance.
关键词
超疏水/芳纶纳米纤维/聚多巴胺/二氧化硅/涂层/力学性能Key words
superhydrophobicity/aramid nanofibers/polydopamine/SiO2/coating/mechanical properties引用本文复制引用
出版年
2024
NETL
NSTL
万方数据