为提高微米TiO-2的分散性，采用偶联剂（KH570）法、无机包覆（铝包覆）法、超声法、非离子表面活性剂（PEG）法、阴离子表面活性剂（月桂酸钠）法,分别对微米TiO-2进行表面改性。分析了改性前后微米TiO-2的亲油化度、表面形态以及粒径大小。结果表明：超声法（功率90 W、时间15 min、温度40 ℃、分散剂质量分数0.5%）和阴离子表面活性剂法（pH为5、月桂酸钠浓度0.050 mol/L、时间30 min）改性微米TiO-2的效果比较显著，更有利于改善其分散性。

Surface modification of micron titanium dioxide was carried out using coupling agent (KH570) method, inorganic coating (aluminum coating) method, ultrasonic method, nonionic surfactant (PEG) method, and anionic surfactant (sodium laurate) method to improve dispersion of micron titanium dioxide. The lipophilic degree, surface morphology and particle size of micron titanium dioxide before and after modification were analyzed. The result showed that ultrasonic method (power 90 W, time 15 min, temperature 40 ℃, mass fraction of dispersant 0.5%) and anionic surfactant method (pH 5, concentration of sodium laurate 0.050 mol/L, time 30 min) are better than the other three methods; they are effective to improve the dispersion of micron titanium dioxide.