纳米TiO_2表面改性及在PUA复合涂层中的应用

以硬脂酸和钛酸酯偶联剂为复合改性剂对纳米TiO2进行表面改性,并通过原位分散和光固化方法制备了改性纳米TiO2/聚氨酯丙烯酸酯(PUA)复合涂层。讨论了纳米TiO2的改性条件及改性效果,并通过SEM、DSC和力学性能测试等手段考察了改性纳米TiO2对PUA性能的影响。结果表明,当钛酸酯为0.00234 mol/L、硬脂酸为0.0352 mol/L、温度45℃、时间1.5 h时,纳米TiO2的表面改性效果较好;改性后的纳米TiO2在PUA中的分散稳定性得到提高,且改性纳米TiO2/PUA复合涂层的力学性能,尤其是耐冲击力和拉伸强度得到了提高。

The Surface Modification of Nano-TiO2 and Its Application in Polyurethane Acrylate Coating

The surface of nano-TiO2 particles was modified by stearic acid and titanium coupling agent as complex agents. The polyurethane acrylate coating was prepared by in-situ dispersion and light curing method. The research included the modified conditions and effects of nano-TiO2. The properties of the polyurethane acryate coating on SEM, DSC and the mechanical properties was tested. The results showed that the effect of surface modification was the best when the content of titanium coupling agent was 0. 00234 mol/L, stearic acid was 0.0352 mol/L, reaction temperature was 45 ℃ and reaction time was 1.5 h. The dispersion stability of modified nano-TiO2 in polyurethane acrylate was improved, and the performance of nano-TiO2/polyurethane acrylate coating, especially impact-resistant and tensile strength were also improved.