含氟纳米杂合涂层的制备及其超疏水与防覆冰性能

发布时间：2018-04-06 00:37

  本文选题：低表面能　切入点：超疏水　出处：《浙江大学》2015年硕士论文

【摘要】：超疏水表面是指材料表面稳定的水接触角要大于150°,滚动接触角小于10°。超疏水表面的形成是纳微复合型的粗糙结构和疏水型化学基团共同作用的结果。由于具有特殊的表面润湿性能,超疏水材料被广泛应用于防污涂料、抗菌涂层、海洋涂料、织物“三防”整理剂、生物相容性材料、自清洁材料等各种领域。如何高效构建超疏水表面,并拓展其在一些新兴领域的应用成为研究者们关注的焦点。本文采用工艺简单的溶胶凝胶法,以纳米硅溶胶、甲基三乙氧基硅烷(MTES)以及全氟己基磺酰氨丙基三乙氧基硅烷(HFTES)为原料,通过共水解缩合反应,制备了含氟纳米杂合涂层材料,研究了其超疏水/疏油自清洁性能及低温超疏水防覆冰性能。通过SEM, AFM及XPS等手段对纳米杂合涂层进行分析,发现含氟基团在涂层表面具有明显的富集现象,随着硅溶胶含量的增加,涂层表面呈现不同尺度的粗糙结构。随着HFTES含量的增加,表面具有不同的化学组成。进一步通过接触角测试,研究了表面粗糙度和HFTES含量对涂层润湿性能的影响,发现当硅溶胶含量为达到30 wt%以上时,可形成纳微复合粗糙结构,此时若HFTES含量高于6 wt%,所制备的含氟纳米杂合涂层的水静态接触角达到166°,接触角滞后和滚动角均小于5°,具有超疏水性能。当HFTES含量继续增加至30 wt%时,涂层对水、乙二醇、正十六烷、二碘甲烷的静态接触角分别为166°,143°,102°,136°,该涂层还表现出优异的油下超疏水性能和明显的抗血液与蛋清粘附性能,表现出优异的多重疏液性能。对制备的纳米杂合涂层进一步开展了低温超疏水与防覆冰性能的研究,发现较高的氟含量下涂层可表现出优异的低温超疏水性能,HFTES含量为30 wt%和40 wt%的涂层在-20℃的低温环境下,对水的静态接触角大于160°,且滚动角小于10°,表现出优异的低温超疏水性能,而HFTES含量为6 wt%和10 wt%的杂合涂层则会在此温度下则丧失超疏水性能。在-20℃的低温环境下,当HFTES的含量在30 wt%和40 wt%时,制备的超疏水涂层可以有效延长结冰时间达到1760s以上,具有较优异的低温防覆冰性能。
[Abstract]:The superhydrophobic surface means that the stable water contact angle is greater than 150 掳and the rolling contact angle is less than 10 掳.The formation of superhydrophobic surface is the result of the interaction between the rough structure of nanocomposite and hydrophobic chemical groups.Because of its special surface wettability, superhydrophobic materials are widely used in antifouling coatings, antimicrobial coatings, marine coatings, fabric "three prevention" finishing agents, biocompatibility materials, self-cleaning materials and other fields.How to efficiently construct superhydrophobic surface and expand its application in some new fields has become the focus of researchers.In this paper, fluorine-containing nano-hybrid coating materials were prepared by a simple sol-gel method using nano-silica sol, methyl triethoxy silane (MTESs) and perfluorohexyl sulfonyl propyl triethoxysilane (HFTES) as raw materials through co-hydrolysis condensation reaction.The superhydrophobic / oil-free self-cleaning properties and low-temperature super-hydrophobic anti-icing properties were studied.By means of SEM, AFM and XPS, it was found that fluorine-containing groups had obvious enrichment on the coating surface. With the increase of silica sol content, the surface of the coating presented rough structure of different scales.With the increase of HFTES content, the surface has different chemical composition.The effects of surface roughness and HFTES content on the wettability of the coating were studied by contact angle measurement. It was found that the nano-composite rough structure could be formed when the content of silica sol was over 30 wt%.When the content of HFTES is higher than 6 wt, the water static contact angle, contact angle lag and rolling angle of the fluorine-containing nano-hybrid coating are up to 166o, and the contact angle is less than 5 掳, so it has super hydrophobic property.The static contact angle of the coating to water, ethylene glycol, hexadecane and diiodomethane was 166 掳/ 143 掳/ 102 掳/ L ~ (136 掳), respectively, when the HFTES content continued to increase to 30 wt%. The coating also showed excellent oil superhydrophobic property and obvious anti-blood adhesion to egg white.It shows excellent performance of multifold liquid thinning.Further studies on the low-temperature ultra-hydrophobic and ice-resistant properties of the nano-hybrid coatings were carried out.It was found that the coatings with excellent low temperature super hydrophobicity and HFTES content of 30 wt% and 40 wt% could be obtained at a low temperature of -20 鈩，

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