纳米杂化有机硅溶胶在金属防腐中的应用

Application of the nanometer hybrid organic silica sol to metal corrosion protection

以四乙氧基硅烷与一些有机硅氟烷为原料,通过溶胶-凝胶法,在催化剂和加热条件下制备出醇基纳米杂化有机硅溶胶。研究了它们的水接触角。结果发现,当n(MTES)∶n(TEOS)=4∶1时,涂膜的疏水性最好。以疏水性强的前驱体DMDES、OTES和12FHPTMS对该纳米杂化有机硅溶胶进行改性,所得涂膜的疏水性能明显增强。采用IR对涂膜进行了表征。电镜照片显示,硅溶胶颗粒粒径为60～100nm。研究了涂膜的理化性能。结果表明,涂膜的疏水性强,硬度9H,附着力1级,冲击强度达500N·cm以上。其中,成本最低的涂膜,也具有较好的耐蚀、耐污和抗洗刷性。

An alcohol-soluble nanometer hybrid organic silica sol was prepared by sol-gel reaction, with tetraethoxy- silane and some organic fluoro-alkyl silanes as material, in condition of catalyst and heating. Film＇s water contact angles were studied. Results show that film＇s hydrophobicity is good whenn （MTES） ： n （TEOS） = 4：1. And the hydrophobicity is strengthened obviously when the nanometer hybrid organic silica sol was modified by precursors of DMDES, OTES and 12FHPTMS which have strong hydrophobicity. The film was characterized by IR. Electronic microscope photo shows that the particle diameter of silica sol is 60-100 nm. Researches were made on film＇s physical and chemical performance. Results show that the film has good hydro＇ phobicity, with hardness of 9 H, adhesion grade 1, impact strength over 500 N.cm. The film with the lowest cost has good resistance to corrosion, pollution and washing.