纳米SiO_2/有机硅聚丙烯酸复合防冰涂层的制备及性能研究

Fabrication and Performance of Nano-silica/Silicone-modified Polyacrylic Acid Anti-icing Coating

以有机硅聚丙烯酸为成膜物质,经γ-(甲基丙烯酰氧)丙基三甲氧基硅烷(KH-570)表面化学改性后的纳米SiO_2粒子(经甲苯-2,4-二异氰酸酯活化)为无机填料,制备纳米SiO_2/有机硅聚丙烯酸复合防冰涂层。利用红外测试(FT-IR)、热失重(TGA)、扫描电镜(SEM)等研究了纳米SiO_2表面化学改性的机制,探讨了纳米SiO_2用量对涂层表面形貌、浸润性及涂层与冰层之间粘附性能的影响。结果表明,KH-570化学改性提高了纳米SiO_2在涂层中的分散性并有效地提高了涂层表面的疏水性能,当KH-570化学改性后的纳米SiO_2用量为8%时,涂层表面水的接触角为150°,呈现超疏水特性;涂层与冰层之间粘附力随纳米SiO_2用量增加呈现下降趋势,当纳米SiO_2用量为8%时,涂层与冰层之间的粘附力仅为树脂涂膜的30%左右。KH-570化学改性后的纳米SiO_2与低表面能有机硅聚丙烯酸树脂的协同效应使涂层具有了良好的疏水防冰性能。

The anti-icing coatings were prepared by incorporating-,/-（methacryloxypropyl） trimethoxy silane （KH-570） function- alized nano-silica （SiO2 ） into silicone-modified polyacrylic acid. The surface functionalization was confirmed by Fourier trans- form infrared spectrometry （FT-IR）, thermal weight loss （TGA） and scanning electron microscope （SEM）. The results showed that SiO2 was coated with KH-570 during the process of chemical group exchange, resulting in the improved hydrophobicity of the coating and the dispersibility of the SiO2 in the coating. It was also found that the amount of funetionalized SiO2 played an important role in the wettability and adhesive strength property of the coating. When the content of functionalized SiO2 was 8%, the coating exhibited superhydrophobie property when the water contact angle was 150° ; in addition, the increase of functional- ized Si02 content could contribute to low adhesion to the ice ,and when the content of functionalized SiO2 was 8%, the adhesive force to the ice of the superhydrophbic coating was only 30% of that of the polyaerylie acid paint film. These findings suggest that synergistic effect of KH-570 functionalized SiO2 and silicone-modified polyacrylic acid contributes to the hydrophobicity and anti-icing property of the coating.