纳米二氧化钛/氟树脂超疏水涂层的制备及性能

以金红石型纳米TiO2及自制的氟树脂制备了氟碳涂料,采用刷涂法于铁片表面构筑了超疏水涂层。考察了纳米TiO2与氟树脂用量、热处理温度等对涂层疏水性的影响,并分别用扫描电镜(SEM)、接触角测量仪观察和测试了涂层表面的微观结构及疏水性。结果表明,涂层表面的水接触角随着氟树脂用量的增加而增大,随纳米TiO2用量的增加呈先增后减的趋势。涂层的吸水率随着氟树脂用量的增加而减少,随纳米TiO2用量的增加呈先减后增的趋势。随着热处理温度的升高,涂层的水接触角先增后减,吸水率先减后增。最佳工艺条件是TiO2及氟树脂的质量分数分别为12%与40%,热处理温度170℃。此条件下得到的涂层表面具有微/纳二元粗糙结构,对水静态接触角达152°,为超疏水涂层,并具有优异的耐水、耐酸碱、耐洗刷、耐沾污及自清洁性能。

Preparation and properties of superhydrophobic coating based on nano-titania and fluorine resin

A superhydrophobic coating was fabricated on iron sheet via brush painting method and using fluorocarbon paint,which was prepared with rutile-type nano-TiO 2 and home-made fluorine resin.The effects of the dosages of nano-TiO 2 and fluorine resin as well as the heat treatment temperature on hydrophobicity of the coating were studied.The surface microstructure and hydrophobicity of the coating were characterized by scanning electron microscope (SEM) and contact angle meter.The results showed that the water contact angle is increased with increasing dosage of fluorine resin,but increased initially and then decreased with increasing dosage of nano-TiO 2.The water absorption is decreased with increasing dosage of fluorine resin,but decreased initially and then increased with increasing dosage of nano-TiO 2.With the rising of heat treatment temperature,the water contact angle is increased initially and then decreased,but the water absorption is decreased initially and then increased.The optimal process conditions are nano-TiO 2 12wt%,fluorine resin 40wt%,and heat treating temperature 170℃.The surface of the coating prepared thereby has micro- and nano-structures.The coating has excellent resistance to water,acid,and alkali,as well as anti-scrubbing,anti-fouling,and self-cleaning properties.The static water contact angle of the coating is 152°,presenting a superhydrophobicity.