聚硅氧烷表面改性二氧化钛粒子及超疏水性能

Modified titanium dioxide powder by fluorine-hydrovinyl polysiloxane and investigation on its superhydrophobic properties

摘要:

为了提高二氧化钛的疏水性，解决无机二氧化钛填料在有机溶剂中的分散性、相容性等问题，采用含氟含氢乙烯基聚硅氧烷（F-PMHS）对二氧化钛粉体进行表面改性，得到具有超疏水性能的改性二氧化钛。通过FT-IR、TGA、SEM、接触角测试、沉降实验等方法研究改性后二氧化钛粒子的结构，测试其超疏水性能，分析超疏水表面形成的机理。结果表明，F-PMHS相对二氧化钛粉体质量分数仅为8%时，改性后二氧化钛粉末涂层与水的静态接触角即可达152.4°，具有良好的超疏水性能，且二氧化钛粒子在有机溶剂中的分散性与相容性得到显著提高。

Abstract:

In order to improve the hydrophobicity property of titanium dioxide and solve the problems in its low dispersibility and compatibility in organic solvents, the surface of titanium dioxide powder was modified by using fluorine-hydrovinyl polysiloxane (F-PMHS). The structures and superhydrophobic properties of the modified TiO2 were studied by FT-IR, TGA, SEM, contact angle tests and sedimentation experiments. The formation mechanism of the superhydrophobic surface was also analyzed in detail. The results showed that when the mass fraction of F-PMHS relative to TiO2 is only 8%, the static contact angle between the modified TiO2 coating and water can reach 152.4 ° with good superhydrophobic properties, and the dispersion and compatibility of TiO2 in organic solvents are significantly improved.