利用有机硅对单分散性 Si O 2纳米球疏水改性,通过浸涂提拉法和加热固化交联制得超疏水涂层。研究了单分散性纳米 Si O 2溶胶球尺寸大小和有机硅含量对接触角的影响。探讨了涂层在高温与酸碱盐条件下超疏水性能的变化。结果表明,当溶胶 Si O 2纳米球粒径增加到130 nm,无需继续添加气相SiO2纳米粒子含量就能达到微纳米结构,从而实现超疏水性。随着有机硅含量增加,其接触角会先增加到极大值(151°)而后会下降。此外涂层可耐450℃的高温,在不同的pH 值溶液和盐溶液中可保持其超疏水性能。扫描电镜照片表明涂层具有微纳米二维尺度粗糙结构。
The superhydrophobic coatings were prepared using dip-coating and withdrawal method,in which the monodisperse nano-particles silica spheres was modified with hydroxyl silicone resin,and the coatings were cross-linked by heat curing.The research studied the effect of the size of the sol nano SiO2 particles and content of the silicone resin on the hydrophobic performance,the variation of superhydrophobic properties of the coat-ings after high temperature and acid,alkaline and salt solution were discussed.The results showed that the size of the sol nano SiO2 particles increased to 130 nm,the superhydrophobicity of coating could be obtained without adding fumed nano SiO2 further.The contact angle of the coating increased to the maximum value (151°)first, and then decreased with the concentration of organosilicone resin increasing.In addition,the coatings can keep superhydrophobicity under the 450 ℃ and at different pH aqueous solution and saline solution.The micro-nano hierarchical rough morphology were observed by scanning electron microscopy (SEM).
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