金红石型纳米TiO2在HIPS塑料中的抗老化应用研究

采用金红石型纳米TiO2改性HIPS塑料,SEM及FTIR分析表明,通过表面改性可将低分子有机物接枝到纳米TiO2表面,并提高了无机纳米粒子在HIPS树脂中的相容性和分散性.金红石型纳米TiO2复合改性HIPS经过28d的氙灯气候加速老化后,其力学性能在较长时间内得到保持,抗色变能力大幅度提高,分子链断裂得到有效抑制.FTIR分析老化机理表明,由于纳米TiO2与光稳定剂的协同作用使改性HIPS的光老化速度得到有效抑制,其羰基和羟基吸收峰的振动特征在28 d的老化期间内均未发生明显变化.

Applied Study on Aging Resistance of Rutile Nano - TiO2 in HIPS Plastics

The polystyrene was filled and modified with roille nano - TiO2 as sati - aging additives. It was noted that low molecule organic substance was ingrafted onto nano- TiO2 after surface modification, consequently which upgrading its consistent and disperse property in HIPS resin. After 28 days exposed to xenon arc lamp, the mechanics of HIPS modified by nano - TiO2 kept for a long time. Furthermore, the ability of resisting color aberration was improved, and that rupture of molecule chain was restrained effectively. According to FTIR analysis, the aging mechanism revealed that the cooperating effect of nano - TiO2 in company with organic UV - absorbent could restrict aging rate of modified HIPS in effect. Moreover there was little change for absorbing characteristic of carbonyl and hydroxyl group in the 28 days accelerating aging period.