超疏水银与疏水涂层的制备及其性能研究

发布时间：2018-02-07 17:23

本文关键词： 超疏水银树枝状微-纳结构涂层　出处：《天津理工大学》2017年硕士论文　论文类型：学位论文

【摘要】：近年来,根据自然界里动物和植物存在的特殊现象,受到启发制备的超疏水材料得到广泛应用,这类材料在表面自清洁、防腐蚀、运输、抗结冰等领域有广泛的应用。超疏水银具有良好的热稳定性、耐酸碱性、抗结冰性及其它性质。由于传统制备超疏水材料的方法需要固定基底具有局限性,因此本文探讨了以不固定基底制备出超疏水粉体,随后对其性能以及应用做了进一步探讨。1、用铜粉和硝酸银溶液反应制备出树枝状银,通过调节硝酸银的浓度控制制备出的银的形貌,制备出的银经十六烷基三甲氧基硅烷修饰后得到超疏水银。实验结果表明制备出的银的形貌与反应的硝酸银的浓度有关系,制备出的银的形貌直接影响其疏水效果。当使用的硅烷偶联剂的量为银的质量分数的3%时,其疏水效果达到最好。制备的超疏水银在不同pH的溶液中和温度下依然保持良好的疏水性能,表现出良好的耐腐蚀性和热稳定性;制备的超疏水银同时具有较好的抗菌性。2、以锌粉和硝酸银溶液反应制备出树枝状银,同样调节参加反应的硝酸银的浓度制备出不同形貌的银,经硅烷偶联剂修饰后也达到超疏水银。疏水性与反应的硝酸银的浓度有关。由于其树枝状结构以及表面被修饰剂修饰过,电阻率有明显提高。将涂有超疏水银一面的物体放置在水中与在水中未涂有超疏水银的物体相比有明显的减阻效果。随着固体表面水滴体积逐渐增大,水滴在超疏水银表面的接触角逐渐减小。同时,超疏水银表面也具有较好的抗结冰性。3、将玻璃胶加入无水乙醇中搅拌使其成为均匀的玻璃胶体,随后将制备的银粉加入其中搅拌分散均匀,加入十六烷基三甲氧基硅烷修饰后使其成为超疏水银涂料,当加入的十六烷基三甲氧基硅烷的量为银粉质量的3%时涂料的疏水性能达到最好,将修饰后的涂料涂在不锈钢网上有良好的疏水性能。同时制备的超疏水银涂层具有良好的疏水稳定性以及抗水蒸气性。将聚乙烯醇先涂在基底上,在其表面再涂一层超疏水银涂层可以显著增强涂层与基底的结合力。
[Abstract]:In recent years, superhydrophobic materials, inspired by the existence of special phenomena in animals and plants in nature, have been widely used in self-cleaning, corrosion prevention, transportation, Superhydrophobic silver has good thermal stability, acid and alkali resistance, ice resistance and other properties. In this paper, the superhydrophobic powder was prepared on an unfixed substrate. The properties and applications of superhydrophobic powder were further discussed. The dendritic silver was prepared by the reaction of copper powder with silver nitrate solution. By adjusting the concentration of silver nitrate to control the morphology of silver prepared, the silver prepared by cetyltrimethoxy silane was modified to obtain superhydrophobic silver. The experimental results show that the morphology of silver prepared is related to the concentration of silver nitrate. The morphology of the prepared silver directly affects its hydrophobic effect. When the amount of silane coupling agent used is 3% of the mass fraction of silver, The hydrophobic effect of the prepared superhydrophobic silver is the best. The prepared superhydrophobic silver still maintains good hydrophobicity and good corrosion resistance and thermal stability under different pH solution neutralization temperature. The prepared superhydrophobic silver also has good antibacterial properties. Dendritic silver was prepared by the reaction of zinc powder with silver nitrate solution, and silver with different morphologies was prepared by adjusting the concentration of silver nitrate participating in the reaction. The hydrophobicity is related to the concentration of silver nitrate. Because of its dendritic structure and surface modified by modifier, The resistivity is obviously improved. The drag reduction effect of the objects coated with superhydrophobic silver side in water is obvious compared with that of those without superhydrophobic silver in water. As the volume of water droplets increases on the solid surface, The contact angle of water droplets on the surface of superhydrophobic silver decreases gradually. At the same time, the surface of superhydrophobic silver also has a good anti-icing property .3. the glass glue is added into anhydrous ethanol to make it a uniform glass colloid. The silver powder was then mixed and dispersed evenly, and then modified with cetyltrimethoxy silane to form a superhydrophobic silver coating. When the amount of cetyltrimethoxysilane added is 3% of the silver powder mass, the hydrophobicity of the coating is the best. The modified coating has good hydrophobic properties on stainless steel mesh, and the superhydrophobic silver coating has good hydrophobic stability and water vapor resistance. A superhydrophobic silver coating on the surface can significantly enhance the adhesion between the coating and the substrate.
【学位授予单位】：天津理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TB34

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