中文摘要：

以超声波法将不同比例的纳米TiO2分散在环氧树脂乳液中，增韧环氧树脂表面施胶剂，提高环氧树脂表面施胶剂的韧性和机械强度。研究了影响纳米TiO2在环氧树脂乳液中均匀分散的因素，并对改性后环氧树脂涂膜进行检测。结果表明改性环氧树脂的条件为：超声时间30min、环氧树脂温度50℃、超声功率100％、环氧树脂质量分数60％、纳米TiO2添加量3％。此条件下改性环氧树脂乳液粒径为1．69μm，改性环氧树脂的不透明度、储能模量与损耗因子明显提高，玻璃化温度略有降低。将改性环氧树脂用于表面施胶，纸张纵向抗张强度、表面结合强度、耐折度有明显提高，挺度略有下降。

英文摘要：

The toughness and mechanical strength of epoxy resin surface size were improved by adding some nano-TiO2 to epoxy resin emulsion dispersed with ultrasonic method. Process parameters were varied systematically with the aim of achieving an optimum dispersion process. The results showed that an optimum dispersion with epoxy resin particle size of 1.69 μm was achieved when the dispersion time was 30 min, the temperature of epoxy resin was 50 ℃, the ultrasonic amplitude was 100 % , the mass fraction of epoxy resin was 60% , and 3% nano-TiO2 was incorporated. And the opacity, storage modulus and loss factor of modified epoxy resin increased obviously while tend decreased slightly. Compared with unmodified epoxy resin, modified epoxy resin surface sizing agent had a clear positive effect on CD tensile strength, pickstrength and folding strength, where as a little negative influence on stiffness.