【作者】 韩斌；

【导师】 朱艳吉； 陈劼；

【作者基本信息】 天津大学 ， 工程（专业学位）， 2021， 硕士

【摘要】 近年来,超疏水涂层由于其独特的润湿性能与巨大的应用潜力已经引起人们的广泛关注。受自然界中荷叶的启发,研究人员通过构建粗糙结构以及降低表面能已经能够制备具有超疏水性能的复合涂层。然而,这些涂层的耐久性较差,无法经受工作环境中遭遇的摩擦磨损,而且,涂层的表面结构疏松,容易加速腐蚀介质对金属基底的腐蚀。基于以上问题,本文以环氧树脂为基体树脂,添加功能改性后的填料,利用简单的喷涂技术制备了具有一定应用潜力的耐磨防腐多功能超疏水涂层。论文的主要内容可总结为以下几点:首先,以改性后的碳纳米管、二氧化硅为填料,利用固化温度对涂层表面形貌的影响,通过室温固化工艺制备了具有独特双层结构的超疏水复合涂层。韧性良好的碳纳米管明显改善了环氧树脂固化后的脆性问题,显著提高了涂层的耐磨性能、抗冲击能力等机械性能。由于室温固化形成的微孔结构促进了对空气的吸附储存,涂层在水流冲击下显示出优异的耐久性能。Tafel和EIS测试结果表明,制备的涂层相较于环氧树脂能够对金属基板起到更好的防腐效果。此外,涂层还具有良好的自清洁和自修复性能。然后,选用富含羟基的埃洛石为主要填料进行功能化改性,一方面利用溶胶凝胶和氟化改性在其表面原位生长疏水纳米二氧化硅,构建纳微结构,提高涂层的疏水性能;另一方面借助3-氨基丙基三乙氧基硅烷对其进行官能化处理,增强对锌阳离子的储存能力,提高涂层对金属基板的防腐效果。将两种改性后的埃洛石添加至环氧树脂基体后,通过喷涂技术,最终在铝板表面制得具有高粘附能力、强防腐效果的超疏水复合涂层。同时,涂层可以经受上千次的摩擦测试,对生活中常见的污染物也具有良好的排斥性。最后,以对环境友好的苯并三唑为腐蚀抑制剂,高孔隙率、高比表面积的多孔二氧化硅为负载容器,借助环氧树脂与埃洛石分别在铝板、钢板表面制备了防腐效果显著超疏水复合涂层。电化学测试表明,制得的超疏水涂层浸泡在3.5 wt.%Na Cl溶液后最低频率的阻抗模量比环氧树脂涂层高四个数量级,而且浸泡五个月后仍表现出优异的耐腐蚀性能。即使在严苛的盐雾环境中,该涂层也能够为底部的金属基板起到良好的防护效果。此外,涂层的机械性能稳定,能够经受严格的粘附强度和耐磨性能测试,还表现出良好的耐紫外性能和自清洁性能。更多还原

【Abstract】 In recent years,superhydrophobic coatings have attracted extensive attention due to their unique wetting performance and broad application prospects.Inspired by lotus leaves in nature,the researchers have prepared composite coatings with superhydrophobic properties by constructing rough structures and reducing surface energy.However,these coatings have poor durability and cannot withstand the friction and wear encountered in the working environment.Moreover,the surface structure of the coating is loose,which contributes to accelerate the corrosion of the corrosive medium to the metal substrate.Based on the above problems,this paper uses epoxy resin as the matrix resin,adds functional fillers and adopts spraying techniques to prepare wear-resistant and anti-corrosion multifunctional superhydrophobic coatings with certain application potential.The main contents can be summarized as follows:First,using modified carbon nanotubes and silica as fillers,according to the effect of curing temperature on the surface morphology,a superhydrophobic composite coating with bistratal structure is prepared by ambient curing process.Carbon nanotubes with outstanding toughness significantly ameliorate the brittleness of epoxy resin,and improve the wear resistance and impact resistance of the coating.Because the microporous structure formed by ambient curing promotes the adsorption and storage of air,the coating shows excellent durability under the impact of water flow.The test results of Tafel and EIS demonstrate that the prepared coating possesses a better anti-corrosion effect on the metal substrate than the epoxy resin.In addition,the coating also has obvious self-cleaning and self-healing capability.Then,select halloysite rich in hydroxyl groups as the main filler for functional modification.On the one hand,utilizing sol-gel and fluorinated modification to grow hydrophobic nano-silica on its surface in situ to construct micro-nano structures and improve the hydrophobic performance of the coating.On the other hand,it is functionalized with 3-aminopropyltriethoxysilane to enhance the storage capacity of zinc cations and improve the anti-corrosion effect of the coating on the metal substrate.After adding two modified halloysites to the epoxy resin,a superhydrophobic composite coating with high adhesion and brilliant anti-corrosion performance is finally prepared on the surface of the aluminum plate.At last,the environmentally friendly benzotriazole and porous silica with high porosity and high specific surface area are employed as corrosion inhibitor and load container,respectively.With the aid of epoxy resin and halloysite,the superhydrophobic composite coatings with significant anti-corrosion effects can be prepared on the surfaces of aluminum plate and steel plate.The electrochemical impedance spectroscopy shows that the lowest frequency impedance modulus of the prepared coating immersed in 3.5 wt.% Na Cl solution is four orders of magnitude higher than that of epoxy resin.Moreover,it still exhibits extraordinary corrosion resistance after being immersed for five months.Even in the harsh salt spray environment,the coating can also play an outstanding protective effect for the metal substrate.In addition,the coating not only has stable mechanical properties,can withstand strict adhesion strength and wear resistance tests,but also exhibits good UV resistance and self-cleaning property.更多还原