硅铝氧化物二元包覆钛白粉颗粒的有机改性

在二元包覆ＳiO2,AL2O3薄膜的基础上，用钛酸酯偶联剂、硅烷偶联剂及三乙醇胺、系戊四醇对亚微米ＴiO2颗粒表面进行有机改性，考察了改性条件对果粒表面改性结果的影响，通过疏水性试验和润湿试验对改性前后ＴiO２颗粒的表面特性进行了表征，高温裂解色谱、热重分析、Ｘ光电子能谱的测试结果表明，不同改性剂与颗粒表面存在不同程度的化学键合作用，分析了改性剂在粒表面的包覆状态与结构。

Organic Modification on the Sub-micron Particles of TiO2 Pre-coated with SiO2 and Al2O3

Five kinds of silane and titanate coupling,triethanolamne and pentaerythrite modification regents were used to modify the sub-micron particles of TiO2 pre-coated with SiO2 and Al2O3.The hydrophobic characteristics of samples at different modification temperatures,regent concentrations and time were investigated.A hydrophobie index and the relative contact angle in the hydrophobic and wetting experiments were employed to evaluating modification results.The titanate coupling regent(CH3)2CHOTi (OCOOR)2OP(O) (OR′)2 was found to be the best modification regent for the TiO2 particles pre-coated with SiO2 and Al2O3 from hydrophilicity to hydrophobicity.The checking results of pyrolytic gas chromatography,thermogravimetric analysis and the X-ray photoelectron spectra have shown that some modification regents were tightly coated on the particle surface.The chemical bond of Al－O－Ti is likely to form between the molecule of organic reagent (CH3)2CHOTi(OCOOR)2OP(O)(OR′)2 and the particle surface in the modification process.