| 摘要: | 紫外線會造成皮膚的曬傷、變黑和老化，甚至會造成皮膚癌。防曬產品已是必需品，不僅要有適合的SPF值，更需要耐水，於流汗、游泳後仍保有SPF值。本研究主要改變油溶性乳化劑(Span 20)、成膜劑Polyvinyl pyrrolidone(PVP)、化學性防曬劑(OMC、PARSOL 1789)與物理性防曬劑(TiO2)比例，探討其對防曬乳SPF值、耐水性、紫外線穩定性與流變性的影響。實驗結果顯示：(1) Span 20添加量越高，SPF值越低，kd值略微提升，耐水性下降。觸變回復率越高，LVE值越小，屈服值越低。(2) PVP K-30添加量越高，SPF值越高，kd值越小，耐水性上升。觸變回復率越高，LVE值越大，屈服值越高。(3) OMC添加量越高，SPF值越高，kd值越小，耐水性上升。觸變回復率變低，LVE值越小，屈服值越低。(4) PARSOL 1789添加量越高，SPF值越高，kd值越小，耐水性上升。觸變回復率變低，LVE值越小，屈服值越低。(5) TiO2添加量越高，SPF值越高，kd值越小，耐水性上升。觸變回復率變低，LVE值越小，屈服值越低。
Sun's ultraviolet radiation can cause skin sunburn, darkening and aging, the most serious and even will cause skin cancer. Sunscreen products are necessities,SPF value not only appropriate, but also need to be water resistant, can still retains SPF value after sweating or swimming. In this study, changes the ratio of Span 20, Polyvinyl pyrrolidone (PVP), OMC, PARSOL 1789 and TiO2, proportional to explore their sunscreen SPF value, water resistance, UV stability and rheology.Experimental results show as following:(1) The higher rate of Span 20, SPF is lower, kd is slightly increased, and water resistance decreases. Thixotropic response rate will be higher, LVE lower, and smaller yield value. (2) The higher rate of PVP K-30, SPF is higher, kd will be lower, and water resistance increase. Thixotropic response rate will higher, LVE higher, and higher yield value. (3) The higher rate of OMC, SPF is higher, kd will be lower, and water resistance increase. Thixotropic response rate will lower, LVE lower, and lower yield value. (4) The higher rate of PARSOL 1789, SPF is higher, kd will be lower, and water resistance increase. Thixotropic response rate will lower, LVE lower, and lower yield value. (5) The higher rate of TiO2, SPF is higher, kd will be lower, and water resistance increase. Thixotropic response rate will lower, the LVE lower, and lower yield value. |
