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以机械高速搅拌法制备了CaCO_3/SiO_2复合粒子,并用六甲基二硅氮烷(hexmethyldisilazane,HMDS)对其进行了表面修饰。结合扫描电镜、透射电镜、Fourier变换红外光谱和热重分析对复合粒子进行了分析表征。结果表明:SiO_2粒子成功地修饰在了CaCO_3的表面,形成了“草莓”结构。HMDS中的-Si(CH_3)_3也有效地接枝到了SiO_2的表面。通过粒子亲油性测定,发现复合粒子经HMDS处理后由亲水变成了疏水。由修饰后的复合粒子制备的涂层表现出良好的超疏水性能,静态水接触角为169°,滚动角仅为2°,同时也具有一定的防覆冰性能。
The CaCO_3 / SiO_2 composite particles were prepared by mechanical high-speed stirring method and were surface-modified with hexamethyldisilazane (HMDS). Combined with scanning electron microscopy, transmission electron microscopy, Fourier transform infrared spectroscopy and thermogravimetric analysis of the composite particles were characterized. The results showed that the SiO_2 particles were successfully modified on the surface of CaCO_3, forming a “strawberry” structure. -Si (CH_3) _3 in HMDS is also effectively grafted onto the surface of SiO_2. Through the determination of lipophilicity of the particles, the composite particles were found to be hydrophobic from hydrophilic to HMDS-treated. Coatings prepared from the modified composite particles show good superhydrophobic properties with a static water contact angle of 169 ° and a roll angle of only 2 °, as well as some anti-icing properties.