通过十二氟庚基丙基三甲氧基硅烷对ZnO粒子进行改性，使ZnO表面由亲水性变为疏水性，然后将改性ZnO粒子与低表面能的热塑性树脂聚苯乙烯杂合，于160°C下烘烤25 min，在钢片上制得改性ZnO/聚苯乙烯复合超疏水涂层。采用红外光谱、扫描电镜和接触角分析仪对涂层表面结构和疏水性进行了研究。结果表明，改性后的 ZnO 粒子表面引入了疏水性的─CH3和─CF2─，形成微/纳米双重粗糙结构。当改性ZnO和聚苯乙烯的质量比为7∶3时，所得复合涂层表面与水的静态接触角为156°，滚动角8°，与钢片的附着力为2级，硬度B~H，冲击强度大于50 kg?cm，吸水率为7.3%，具有良好的应用前景。
ZnO particles were modified by dodecafluoro-heptyl-propyl-trimethoxysilane for making their surface from hydrophilic to hydrophobic, and then blended with polystyrene (a low-surface-energy thermoplastic resin) and baked at 160 °C for 25 min to prepare a modified-ZnO/polystyrene superhydrophobic composite coating on the surface of steel sheet. The surface structure and hydrophobicity of the coating was studied by infrared spectroscopy, scanning electron microscopy, and contact angle analyzer. The results showed that─CH3 and ─CF2─groups are introduced on the surfaces of ZnO particles after modification, leading to a micro- and nano-meter double rough structure. The composite coating obtained at mass ratio of modified ZnO to polystyrene 7:3 has a static contact angle of 156° and a rolling angle of 8° against water, and features the follows performances: 2nd-grade adhesion to steel substrate, B-H hardness, impact strength >50 kg·cm, and water absorption rate of 7.3%. The modified ZnO/polystyrene superhydrophobic composite coating has good application prospect.
steel substrate, B-H hardness, impact strength >50 kg·cm, and water absorption rate of 7.3%. The modified ZnO/polystyrene superhydrophobic composite coating has good application prospect.
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