摘要
从光敏反应机理出发 ,用色差方法评估了各类化妆品用二氧化钛的光活性。结果表明 ,颜料级二氧化钛光活性不明显 ,而超细二氧化钛因其对UV线的吸收 ,有明显的光活性 ;通过对各种超细二氧化钛的防晒因子 (SPF)值的测定 ,证明SPF值与光活性之间无顺变关系 ,即高防晒性并不意味着高光活性 。
The photo-activities of different type of TiO 2 for cosmetics use had been measured by colorimetric method on the base of the mechanism of their photo-reaction.The result indicated that the pigment grade TiO 2 aimost has no obvious photo-activity,in contrast,the ultra-fine TiO 2 has obvious photo-activity because of its high absorption of UV radiation.The measuring SPF of various ultra-fine TiO 2 by SPF290 indicated the sun-protecting ability has independent of its photo-activity,so the high sun-protecting ability doesn't mean high activity or unsafe because the photo-activity is effected by the surface properties of powders and the surrounding conditions. Its possible to diminish or eliminate photo-reaction of TiO 2 while ensuring high sun-protecting ability.
出处
《日用化学工业》
CAS
CSCD
北大核心
2002年第1期72-74,共3页
China Surfactant Detergent & Cosmetics
