Sol-Gel Preparation of Organic Colorant-Doped Silica Gel and its Properties.

概要

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Organic colorants used for coloring of cosmetics must have vivid tones and a rich variety of hues. However, some organic colorants suffer discoloration and deterioration due to light and heat.The authors tried to develop organic colorant-doped silica gels to improve stability and optical properties of organic colorants. We prepared the organic colorant-doped silica gel by a sol-gel reaction at low temperature (room temperature to 80°C) from homogeneous starting solution, which consisted of tetraethoxysilane (TEOS), ethanol, water, and carminic acid in the presence of catalytic acid.We evaluated the optical properties, elution resistance, and heat resistance of the products, and the doped carminic acid in the resultant silica gel were proved to be more stable than noncomplexed carminic acid or Carmine (commercial lakes).These results confirmed that doping of organic colorants into the three-dimensional network structure formed by silica gel is a promising technique to expand functionality and improve stability of organic colorants, and it may open a promenade to the creation of new color additives.
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