溶胶-凝胶法超疏水含氟硅聚氨酯丙烯酸酯/SiO_2杂化涂层的制备

Preparation of Superhydrophobic FSiPUA /SiO_2 Hybrid Coatings via Sol-Gel Method

以正硅酸乙酯(TEOS)和甲基三乙氧基硅烷(MTES)为前驱体,在含氟硅聚氨酯丙烯酸酯(FSiPUA)复合乳液中采用溶胶-凝胶法制备了超疏水杂化涂层。考察了MTES/TEOS的摩尔比和FSiPUA复合乳液用量等对涂层表面粗糙度、疏水性、成膜性等表面性能的影响。通过扫描电镜和接触角仪表征了涂层的微观结构及疏水性,利用马尔文粒度分析仪和傅里叶红外光谱仪分析了二氧化硅(SiO2)的平均粒径和化学结构。结果表明,随着MTES/TEOS摩尔比增加,杂化涂层的表面粗糙度逐渐下降,疏水性先增大后减小;随着FSiPUA复合乳液用量增加,涂层的成膜性逐渐变好;当(TEOS+MTES)∶C2H5OH∶NH3·H2O∶AMP-95的摩尔比为1∶6.67∶1.83∶0.24,MTES/TEOS摩尔比值为5,FSiPUA复合乳液用量为20%时,涂层具有超疏水特性,其水接触角(WCA)和滚动角(SA)分别为161.5°和2.8°,涂层表面对水滴具有优异的不粘附性。

A novel superhydrophobic FSiPUA /SiO2 hybrid coating was synthesized in siloxane and fluorine containing-polyurethane-acrylate composite emulsion( FSiPUA) via sol-gel process using tetraethoxysilane( TEOS) and methyltriethoxysilane( MTES) as precursors. The effects of the mole ratio of MTES to TEOS( R) and the content of FSiPUA emulsion on the surface roughness,hydrophobicity and film-forming property of the hybrid coating were discussed. The microstructure and hydrophobic property of the hybrid coating were characterized by scanning electron microscopy( SEM) and contact angle( CA),respectively. The average particle size and chemical structure of the silica( SiO2) particles were analyzed by particle size analyzer and Fourier transform infrared spectroscopy( FT-IR),respectively. The results show that,with increase of the mole ratio of MTES to TEOS( R),the surface roughness of the hybrid coating declines and the hydrophobicity increases first and then decreases; the film-forming property of the coating is improved with increase of the FSiPUA emulsion content; and when the mole ratio of( TEOS + MTES) ∶ C2H5OH∶ NH3·H2O∶ AMP-95 is 1∶ 6. 67∶ 1. 83∶ 0. 24,R is 5,and the content of FSiPUA composite emulsion is 20%,the water contact angle( WCA) and sliding angle( SA) of the hybrid coating are 161.5° and 2.8°,respectively. Furthermore,the superhydrophobic coating reprents excellent non-sticking property to the water droplet.