改性TiO2纳米材料的制备及防晒化妆品的应用性能分析

Preparation of modified TiO2 nanomaterials and application performance analysis of sunscreen cosmetics

通过超声水解法制备了SiO2包覆的SiO2/TiO2纳米材料,研究了不同热处理温度对SiO2/TiO2纳米材料性能的影响,测试发现SiO2/TiO2纳米材料结构未发生变化,均为金红石型TiO2,SiO2包覆后通过物理包覆作用与TiO2发生了结合。微观测试发现SiO2/TiO2材料均为球形颗粒,直径为1.5~2μm,随着热处理温度的增加,尺寸轻微增大。亲水亲油测试表明SiO2/TiO2纳米材料具有较强的亲油性。其对亚甲基蓝的褪色率低于纯TiO2,随着热处理温度的增加,褪色率先降低后升高,550℃处理的SiO2/TiO2纳米材料对亚甲基蓝的褪色率最低为18.7%。将SiO2/TiO2纳米材料自制成防晒乳液,其对于紫外光屏蔽效果优于纯TiO2,热处理温度为550℃时,复合材料的透射率最低,对紫外光的屏蔽效果最佳。综合来看,SiO2包覆后的SiO2/TiO2复合材料在防晒化妆品的应用中具有较高的潜力。

SiO2-coated SiO2/TiO2 nanomaterials were prepared by ultrasonic hydrolysis.The effects of different heat treatment temperatures on the properties of SiO2/TiO2 nanomaterials were studied.It was found that the structure of SiO2/TiO2 nanomaterials did not change,and they were all rutile-type TiO2.SiO2 was combined with TiO2 by bonding after SiO2 coating.The results of microscopic test showed that the SiO2/TiO2 materials were spherical particles with diameter of 1.5-2μm,and the size was slightly increased with the increase of heat treatment temperature.Hydrophilic and lipophilic tests showed that the SiO2/TiO2 nanomaterials had strong lipophilicity.The fading rate of methylene blue by SiO2/TiO2 nanomaterials was lower than that of pure TiO2.With the increase of heat treatment temperature,the fading rate first decreased and then increased.The fading rate of methylene blue by SiO2/TiO2 nanomaterials treated at 550℃was the lowest(18.7%).The SiO2/TiO2 nanomaterials were introduced into sunscreen lotions,indicative of better UV shielding effect than pure TiO2.When the heat treatment temperature was 550℃,the transmittance of the composite material was the lowest and the UV shielding effect was the best.Overall,the SiO2/TiO2 composites coated with SiO2 had high potential of application in sunscreen cosmetics.