高等学校化学学报 ›› 2001, Vol. 22 ›› Issue (1): 104.

• 研究论文 • 上一篇    下一篇

硅铝氧化物二元包覆钛白粉颗粒的有机改性

林玉兰, 王亭杰, 覃操, 杨俊, 金涌   

  1. 清华大学化学工程系, 北京 100084
  • 收稿日期:1999-12-24 出版日期:2001-01-24 发布日期:2001-01-24
  • 通讯作者: 王亭杰(1964年出生),男,博士,副教授,从事微细颗粒制备与改性研究.E-mail:wangtj@mai.ltsinghua.edu.cn E-mail:wangtj@mai.ltsinghua.edu.cn
  • 基金资助:

    国家自然科学基金(批准号:29906004);高等学校博士学科点专项科研基金(批准号:99000331)资助

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

LIN Yu-Lan, WANG Ting-Jie, QIN Cao, YANG Jun, JIN Yong   

  1. Department of Chemical Engineering, Tsinghua University, Beijing 100084, China
  • Received:1999-12-24 Online:2001-01-24 Published:2001-01-24

摘要: 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、季戊四醇对亚微米TiO2颗粒表面进行有机改性.考察了改性条件对颗粒表面改性结果的影响.通过疏水性试验和润湿性试验对改性前后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.分析了改性剂在颗粒表面的包覆状态与结构.

关键词: 表面改性, 分散, 二氧化钛, 超细粉, 疏水

Abstract: 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. Ahydrophobic 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.

Key words: Surface modification, Dispersion, Titanium dioxide, Ultrafine particles, Hydrophobicity

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