超憎水SiO2/FEVE复合涂层的制备

目的制备超憎水SiO_2/FEVE复合涂层。方法使用物理混合方式将SiO_2填料加入到成膜物FEVE树脂中,制得超憎水涂料,并通过雾化喷涂在玻璃片上形成超憎水涂层。通过指触法测量了涂层的表干时间,利用接触角测量仪、扫描电镜以及原子力显微镜检测了超憎水SiO_2/FEVE复合涂层的憎水性能与微观形貌,并利用划格法评价了涂层的附着力。结果根据溶解度参数相近以及环保性原则选用了乙酸乙酯与乙酸丁酯的混合溶剂,最终得出超憎水SiO_2/FEVE复合涂料的配方为:100 g FEVE树脂、135 g乙酸乙酯、90 g乙酸丁酯、25 g D-SiO_2、10.5 g HDI。涂料配制完成后,采用大雾化量与大流量结合的喷涂工艺便可完成SiO_2/FEVE超憎水涂层的制备。涂层形成了含有内嵌孔洞的珊瑚状结构,表面呈现为规律交替分布的突起和凹陷区构成的粗糙结构,接触角可达152.8°,滚动角为8°。结论调整溶剂种类与固化剂加入量并未对涂层的结合力或成膜性有所改善,填料比例是影响涂层成膜性与憎水性能的关键工艺参数。涂层表面有序分布的微纳米级凹凸结构形成了超憎水表面所需有效的表面微观粗糙结构,这是涂层具有优良憎水性能的主要原因。

Preparation of Superhydrophobic SiO2/FEVE Composite Coating

The work aims to prepare superhydrophobic SiO2/FEVE composite coating. SiO2 filler was added into FEVE resin by physical mixing to obtain the superhydrophobic painting and then the superhydrophobic coating was formed on the glass sheet by atomized spraying. Surface drying time of the coating was measured by finger contact method and the hydrophobicity and micro-morphology of superhydrophobic SiO2/FEVE composite coatings were detected by contact angle meter, scanning electron microscopy (SEM) and atomic force microscopy (AFM). In addition, the adhesion of the coating was evaluated through scratch adhesion testing. The mixed solvent of ethyl acetate and butyl acetate was chosen based on the principle of similar solubility parameters and environmental protection. The optimal formulation of superhydrophobic SiO2/FEVE composite coating was composed of 100 g FEVE resin, 135 g ethyl acetate, 90 g butyl acetate, 25 g D-SiO2 and 10.5 g HDI. Spraying process combined with large atomization quality and high flow was adopted to prepare the superhydrophobic SiO2/FEVE composite coating. Coral-like micro-structures were formed in the coating and the coating surface appeared as rough microstructures constructed by alternative distribution of protuberance and concave filed. Water contact angle and sliding angle of the superhydrophobic SiO2/FEVE coating could reach 152.8° and 8° respectively. The bonding force and film-forming ability can not be improved by adjusting the solvents and curing agent proportion, but the filler proportion is the key parameter affecting the film-forming ability and superhydrophilicity. Superior hydrophobicity of the coating is attributed to surface micro-rough structure formed by orderly distribution of micro-nano concave-convex structure.