Abstract
Nail polish, in particular gel nail polish, is the most used cosmetic product. The components of the gel polish, which determine both toxicity and consumer color properties, are pigments. Zn-Al layered double hydroxides intercalated with anionic food dyes are promising pigments for use in gel polish. The parameters of the samples of Orange Yellow S-intercalated Zn-Al (Zn:Al=4:1 and Zn:Al=2:1) hydroxides synthesized at pH=8 and pH=11 were studied. The crystal structure of the samples was studied by X-ray phase analysis and thermogravimetry, and the pigment properties – by the method of measuring and calculating color characteristics in the CIELab and XYZ systems. The color characteristics of gel nail polish samples prepared using synthesized pigments were studied in a similar way.X-ray phase analysis and thermogravimetry showed that Zn-Al-Orange Yellow S pigments synthesized at both Zn:Al ratios and pH were layered double hydroxides with the α-Zn(OH)2 structure. The phenomenon of the decomposition of Zn-Al LDH to ZnO during the synthesis was revealed. As a result, all Zn-Al-Orange Yellow S pigment samples contained both layered double hydroxide and zinc oxide. It was shown that all samples of the Zn-Al-Orange Yellow S pigment obtained at pH 8 and 11 and the ratios Zn:Al=4:1 and Zn:Al=2:1 had high pigment characteristics and are promising for use in gel polish. The samples of gel nail polish with synthesized pigments have a red-orange color (сolor tone 595–604 nm) with high monochromaticity (color purity 63–75 %) and color saturation (48.7–58.3)
Highlights
One of the cosmetic products that mankind has been using since ancient times is nail polish
X-ray phase analysis and thermogravimetry showed that Zn-Al-Orange Yellow S pigments synthesized at both Zn:Al ratios and pH were layered double hydroxides with the α-Zn(OH)2 structure
The aim of the work is to determine the possibility of using Zn-Al layered double hydroxide intercalated with Orange Yellow S, synthesized under various conditions, as an effective pigment for nail polish
Summary
One of the cosmetic products that mankind has been using since ancient times is nail polish. It is the pigments that give the nail polish its color. Cosmetic pigments of gel nail polish can be both natural and synthetic. Inorganic pigments are characterized by high color stability but at the same time, they have a limited range of colors. Organic pigments have a wide range of colors but are characterized by low light stability. Among the pigments of this type, the most promising are layered double hydroxides (LDH) [8] intercalated with dye anions [9, 10]. The combination of various metal cations and anionic dyes of various colors in the composition of LDH will significantly expand the color palette of cosmetic pigments. The synthesis of cosmetic pigments based on LDH intercalated with food dyes of various colors is relevant
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