二氧化钛的疏水改性及其表征

在水相体系中，以二氧化钛为原料，用十六烷基三甲基溴化铵（CTAB）对其进行湿法表面改性。以疏水度为主要考察指标，通过单因素条件实验及正交实验，研究了体系pH值、改性剂用量、改性温度、改性时间等因素对改性效果的影响。结果表明：当体系pH值8、改性剂用量（占二氧化钛总质量的分数）5％、改性时间2．5h、改性温度65℃时，二氧化钛疏水度由13．87％提高至59．89％。

Hydrophobic modification and characterization of titanium dioxide

In aqueous system, titanium dioxide powder is modified using cetyl trimethyl ammonium bromide （ CTAB ） as modifier via wet surface modification. Using hydrophobic degree as the main index, the modification conditions, such as pH value of the modi- fied system, amount of modifier, modification temperature and modification time are investigated by single-factor and orthogonal experi- ments. The optimum conditions are obtained as following： the system pH is 8, the amount of modifier is 5% , the modification time is 2. 5 h and the modification temperature is 65 ℃. Titanium dioxide hydrophobic degree can be increased from 13.87% to 59.89% un- der the optimum conditions.