金红石型纳米TiO_2及改性聚丙烯的紫外-可见光谱特性研究

Study on Ultraviolet Visible Light Spectrum Characteristic of Nano-TiO_2 and Modified Polypropylene

采用荧光紫外灯对金红石型纳米TiO2改性聚丙烯材料进行了加速老化试验,并用紫外-可见分光光度计分析了金红石型纳米TiO2、纳米TiO2改性聚丙烯等材料的紫外-可见光谱特性。结果表明金红石型纳米TiO2在紫外光区有很强的屏蔽特性,添加0.5%就能够将聚丙烯的紫外线屏蔽性能提高2倍;当与受阻胺光稳定剂(HALS)复合使用时能够产生协同作用,将聚丙烯的紫外线屏蔽性能提高9倍,人工加速老化14 d后的紫外屏蔽性能未发生改变,从而能够赋予聚丙烯长效的抗紫外光老化性能。

The polypropylene modified by rutile type nano - TiO2 was degraded by accelerated aging test with high pressure mercury - arc lamp. The ultraviolet and visible light spectra of some samples were analyzed with ultraviolet and visible light spectrophotometer, such as nano - TiO2, nano - TiO2/polypropylene composites and so on. It was noted that rutile type nano - TiO2 had excellent ultraviolet shielding function. The capacity of shielding ultraviolet was increased by 2 times when the polypropylene was filled with 0.5wt% nano - TiO2. The shielding ultraviolet capacity of polypropylene was increased by 9 times when modified by nano- TiO2 cooperating with hinderd amine light stabilizer （HALS）. And the capacity of shielding ultraviolet had not any loss after 14 days artificial weathering, according which can endue excellent aging resistance function to modified ,polypropylene for long time.