去屑香波中吡啶硫酮锌的沉积机理研究

Study for deposition of zinc pyrithione in anti-dandruff shampoo

通过测试去屑香波的絮胶形态、皮肤上吡啶硫酮锌(ZPT)的沉积量及漂白头发的梳理性,对比不同阳离子聚合物和硅油粒径大小对ZPT的覆盖均匀程度和沉积量的作用效果。研究发现:体系中由于同时存在小粒径硅油(SPS)和ZPT的过度积聚,大部分阳离子聚合物不适用于SPS去屑香波中,而改性瓜儿胶由于其特殊的表面处理,不会形成过度絮胶,适用于SPS去屑香波,保证ZPT有效沉积并提供优越调理性;而含大粒径硅油(LPS)的去屑香波中ZPT有效沉积与阳离子聚合物的电荷密度和分子量成正比。

Morphological properties of flocculation in anti - dandruff shampoo, deposition of zinc pyrithione （ZPT） on human skin as well as combing performance of human hair were examined. Effect of various cationic polymers and particle size of silicones with respect to uniformity of ZPT covering and deposition were compared. The results showed that since the co - existence of small particle size silicone （SPS） in the system and over - floeculation of ZPT, most of cationic polymers are not suitable to be used in anti - dandruff shampoo ; while surface modified cationic guar which helps to avoid formation of over - flocculation, can provide better conditioning performance and deliver high effective deposition of ZPT in SPS anti - dandruff shampoo. For anti - dandruff shampoo with large particle size silicone （ LPS）, the deposition effect of ZPT is direct proportional to the charge density and molecular weight of cationic polymer in the shampoo.