纳米TiO2是高效光催化剂,具有抗菌能力强、低毒性、抗菌速度快、颜色稳定性好、有合适波段光照射、有氧气参与及抗菌谱广等特点,且价格低廉、资源丰富.经过处理的纳米TiO2在聚合物基体中具有良好的分散性,且可以起到杀菌的作用,具有抗菌长效性.研究了纳米TiO2在氢化苯乙烯-丁二烯嵌段共聚物(SEBS)医用塑料薄膜中的应用.利用吹塑成型方法制备医用膜,并且对吹塑成型过程中的各种影响因素进行了研究.主要得到以下结论:最佳吹膜温度为200℃,SEBS最佳充油比为2∶1；加入TiO2后,断裂伸长率几乎不变,拉伸强度下降；加入TiO2后,紫外光下SEBS薄膜的老化速度明显加快；TiO2处理与否及各组分含量的变化对薄膜老化速度的影响很小.%The nano-TiO2 was highly efficient photocatalyst, with the characteristics of a strong anti bacterial, low-toxicity, anti-bacterial speed, color stability, suitable band-rays, oxygen participation and a broad spectrum antimicrobial, low cost and resource-rich properties. The nano-TiO2 treated with surface treatment agent had good dispersion in polymer matrix, and it can play a bactericidal effect with a long-term nature of antimicrobial. For these reasons, the application of nano-Ti02 in the medical anti-bacterial medical SEBS films was studied. The blown molding method to prepare the medical SEBS films was employed; a variety of factors on the process of blown molding was investigated. The main results after a series of experiments were concluded as follows. The best film blowing temperature was 200℃. The best ratio of oil-filled of SEBS was 2:1. The use of nano-TiO2 made the elongation at break remain and the strength decreased. The use of nano-Ti02significantly speeded up the aging rate of SEBS films under the ultraviolet light. Whether the nano-TiO2 with or without treatment and the change of other components content had little effect on the aging of the film.
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