二氧化硅纳米颗粒/硅树脂复合超疏水功能涂层的制备和性能研究

Preparation and Properties of Superhydrophobic Composite Coatings of SiO_2 Nanoparticals/Silicone Resin

将二氧化硅纳米颗粒和硅树脂制成混合液,采用喷涂法(spray-coating)制备出了具备超疏水性的复合涂层.研究了二氧化硅、硅树脂不同含量配比对涂层疏水性能的影响,结果表明复合涂层的接触角随二氧化硅含量的增加而增加.在二氧化硅含量大于3%(质量分数)时,涂层显现超疏水性;当二氧化硅含量为3%(质量分数)、硅树脂含量为7%(质量分数)时,涂层与水的接触角达到151.6°,滚动角接近0°.通过扫描电子显微镜(SEM)观察涂层表面的微观结构,发现超疏水性的涂层具备微-纳复合阶层结构,类球状突起粒径在5μm左右,类球状突起上分布纳米团聚颗粒,直径约为50 nm.这种类似荷叶表面的微(纳复合阶层结构,结合硅树脂的低表面能,使得复合涂层具备了超疏水性能.

SiO2 nanoparticals/silicone resin composite coatings were prepared by spray-coating, which exhibit superhydrophobicity. Effects of the contents of SiO2 and silicone resin were investigated preliminarily on the hydrophobic properties of coatings. The results indicate that the water contact angle of composite coatings increases with increase of the content of SiO2. When the mass percentage of SiO2 is more than 3wt%, the composite coatings exhibit superhydrophobicity. Meanwhile the mass percentage of silicone resin is 7wt%, the composite coating has a high water contact angle of 151.6 and a small sliding angle of nearly 0 . The surface morphologies of coatings were observed by scanning electron microscopy （SEM）. It was found that the superhydrophobic composite coating has a rough micro-nanoscale hierarchical structure, with all near-spherical papillas （d ≈ 5 μm） covered by aggregated nanoparticles （d≈50 nm）. Such lotus leaf like micro-nano hierarchical structure in combination with the low surface energy of silicone resin renders the coating surface superhydrophobicity.