UV Protective Effect and Properties According to the surface status, shape and size of silica
551
Presented by: Hyun Dae CHO
Introduction:
Pigments are colorant ingredients in cosmetic fields that is defined as insoluble substances under the hydrophobic and phydrophilic condition. Mica, kaolin, and silica are representative example of pigments. Among these pigments, the extender pigments have important roles in the cosmetic folmulation as ingredients. Silica is one of the most typical extender pigments that improves texture and spreadability of the cosmetics and absorbs sweat or sebum on the skin. Not only that, for the make up products, silica helps long-lasting functions and powdery texture. Therefore, we can easily find the silica not only skin-care products but, make-up and sun care products as well.
Silica shows different chracteristics such as malleability, spreadability according to shape of particles, surface state and it’s particle size. Recently, various shape of porous and hollow types silica have been developed briskly and introduced to cosmetic chemists. Because of the structural features, these silica may improves protective effect from ultra-violet rays(UV) by multiple diffraction or resonance effects of light through the surface and pores. However, The relationship with the UV protection factor according to the characteristics of silica has not been significantly confirmed. Therefore, in this study, the change of the UV protection factor according to the particle size and surface state of silica was evaluated. Furthermore, the UV protection factor was maximized by applying the new porous and hollw type silica in the sunscreens.
Methods:
First, specific gravity, pH, oil absorpstion and coefficient friction of silica was evaluated for identifying properties by the particle size and surface state of silica. pH of silica was dectected by 10% silica aqueous dispersion. Oil absorption of silica was evaluated using castor oil. And friction coefficient was determined using Touch Meter of Heidon Inc for evaluation of texture.
Next, in order to confirm the correlation between silica and the UV protection factor, silica was applied to the O/W type and the W/O type sunscreens for each particle size and surface condition.
Finally, for evalutating UV protection factor, we applied 28.6mg of samples on the Helio plates HD6. After 30 minutes, UV protection factor was measured by SPF-290AS of Solar Ligh Inc.
Results:
First, properties of silica was identifyed by the particle size and surface state of silica. Through these results, there were significant differences in oil absorption and specific gravity depending on the particle size and surface state. Also, SPF and PA increased when silica was added in sunscreens. Among the silica, novel hollow type silica show increase of SPF and PA dramatically.
Discussion and Conclusion:
Silica ,one of the constitutional pigments, was applied to the sunscreen according to particle shape and size to determine the UV protective values according to each characteristic. Most of all, novel silica applied sunscreen had the highest values of SPF and PA. These materials had excellent oil absorption that could give long-lasting effect for sunscreens. And may diminish UV rays by by multiple diffraction or resonance effects of light on the surface, pores and hollow of silica.
Therefore, the sunscreen applied with silica has improved spreadability and glossiness as well as long-lasting UV blocking effect.
In conclusion, The purpose of this study is to suggest the possibility of developing advanced cosmetic materials in the future by confirming the shape and surface of the ideal silica that helps protect UV rays.
Pigments are colorant ingredients in cosmetic fields that is defined as insoluble substances under the hydrophobic and phydrophilic condition. Mica, kaolin, and silica are representative example of pigments. Among these pigments, the extender pigments have important roles in the cosmetic folmulation as ingredients. Silica is one of the most typical extender pigments that improves texture and spreadability of the cosmetics and absorbs sweat or sebum on the skin. Not only that, for the make up products, silica helps long-lasting functions and powdery texture. Therefore, we can easily find the silica not only skin-care products but, make-up and sun care products as well.
Silica shows different chracteristics such as malleability, spreadability according to shape of particles, surface state and it’s particle size. Recently, various shape of porous and hollow types silica have been developed briskly and introduced to cosmetic chemists. Because of the structural features, these silica may improves protective effect from ultra-violet rays(UV) by multiple diffraction or resonance effects of light through the surface and pores. However, The relationship with the UV protection factor according to the characteristics of silica has not been significantly confirmed. Therefore, in this study, the change of the UV protection factor according to the particle size and surface state of silica was evaluated. Furthermore, the UV protection factor was maximized by applying the new porous and hollw type silica in the sunscreens.
Methods:
First, specific gravity, pH, oil absorpstion and coefficient friction of silica was evaluated for identifying properties by the particle size and surface state of silica. pH of silica was dectected by 10% silica aqueous dispersion. Oil absorption of silica was evaluated using castor oil. And friction coefficient was determined using Touch Meter of Heidon Inc for evaluation of texture.
Next, in order to confirm the correlation between silica and the UV protection factor, silica was applied to the O/W type and the W/O type sunscreens for each particle size and surface condition.
Finally, for evalutating UV protection factor, we applied 28.6mg of samples on the Helio plates HD6. After 30 minutes, UV protection factor was measured by SPF-290AS of Solar Ligh Inc.
Results:
First, properties of silica was identifyed by the particle size and surface state of silica. Through these results, there were significant differences in oil absorption and specific gravity depending on the particle size and surface state. Also, SPF and PA increased when silica was added in sunscreens. Among the silica, novel hollow type silica show increase of SPF and PA dramatically.
Discussion and Conclusion:
Silica ,one of the constitutional pigments, was applied to the sunscreen according to particle shape and size to determine the UV protective values according to each characteristic. Most of all, novel silica applied sunscreen had the highest values of SPF and PA. These materials had excellent oil absorption that could give long-lasting effect for sunscreens. And may diminish UV rays by by multiple diffraction or resonance effects of light on the surface, pores and hollow of silica.
Therefore, the sunscreen applied with silica has improved spreadability and glossiness as well as long-lasting UV blocking effect.
In conclusion, The purpose of this study is to suggest the possibility of developing advanced cosmetic materials in the future by confirming the shape and surface of the ideal silica that helps protect UV rays.