Organic UV blocker-supported silica aerogel composite

A technology of silica and hydrophobic silica, which is applied in the direction of cosmetics, aerosol delivery, cosmetic preparations, etc., can solve problems such as the inability to reduce skin irritation, and achieve excellent ultraviolet blocking effect and excellent blocking effect

Inactive Publication Date: 2019-05-21
阿斯汀株式会社
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this composite pigment can only be used in dry powder formulations, and when used in water-in-oil (W / O) or oil-in-water (O / W) emulsion formulations, the organic UV blocking agent is easy to escape from the support, so that it cannot Ensures the effect of reducing skin irritation

Method used

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  • Organic UV blocker-supported silica aerogel composite
  • Organic UV blocker-supported silica aerogel composite
  • Organic UV blocker-supported silica aerogel composite

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0075] Preparation Example 1: Preparation of Silica Airgel Composite

[0076] (1) Preparation of surface-modified hydrophobic silica airgel

[0077] The surface of powder-type hydrophobic silica airgel (RAGEL-P, average particle diameter 50 μm) manufactured by REM Tech. was modified to be hydrophilic using the following method.

[0078] Hydrophobic silica airgel (20 g) was added to a mixed solvent of distilled water (100 g) and ethanol (50 g) and mixed. The mixture was poured into a SUS plate and introduced into a furnace, followed by heating at 350 °C for 2 hours to modify the surface of the hydrophobic silica airgel to be hydrophilic.

[0079] figure 1 It is a photograph comparing (a) dispersing airgel in distilled water before surface modification and (b) dispersing airgel in distilled water after surface modification. It can be confirmed that the hydrophobic silica airgel after surface modification is uniformly dispersed in water, while the hydrophobic silica airgel bef...

experiment example 1

[0084] Experimental example 1: Measurement of loading amount of organic ultraviolet blocking agent

[0085] In order to determine the loading amount of the organic UV blocking agent in the silica airgel composite prepared in Preparation Example 1, a thermogravimetric analysis (TGA) was carried out using a thermal analyzer (Mettler-Toledo TGA / DSC 1), and the results Such as figure 2 shown.

[0086] refer to figure 2 , it can be confirmed that the silica airgel (a) before loading the organic ultraviolet blocking agent has no weight change, but the silica airgel composite (b) carrying the organic ultraviolet blocking agent has 66% mass loss. From this, it can be confirmed that the silica airgel composite of Preparation Example 1 carried the organic ultraviolet blocking agent therein, and the content was 66% by weight of the total weight of the composite.

preparation example 2

[0087] Preparation Example 2: Preparation of Cosmetic Composition for UV-blocking

[0088] (1) Preparation of Examples 1 to 3

[0089] The compositions (unit: weight %) in Table 1 below were used to prepare the ultraviolet blocking cosmetic compositions of Examples 1 to 3.

[0090] [Table 1]

[0091]

[0092] The water phase ingredients of A were mixed and heated at 80° C., and the thickener of B was introduced therein to prepare the water phase part. The oil phase ingredients of C were mixed and heated at 80°C to prepare an oil phase part. The oil phase part was added to the water phase part, and the resultant was stirred at 3000 rpm for 5 minutes using a homogenizer to prepare an oil-in-water type ultraviolet blocking cosmetic composition.

[0093] (2) Preparation of Comparative Examples 1 to 6

[0094] The composition (unit: weight %) of the following Tables 2 and 3 while only changing the type of ultraviolet blocking agent, the preparation method of Examples 1 to 3 ...

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Abstract

The present invention relates to a silica aerogel composite comprising a hydrophilically surface-modified hydrophobic silica aerogel and an organic UV blocker supported in pores of the silica aerogel.The silica aerogel composite of the present invention causes no skin irritation since the organic UV blocker inducing skin irritation is stably supported inside the silica aerogel to minimize the contact with the skin. Also, the silica aerogel composite is high in the organic UV blocker content per unit weight, and exhibits an excellent blocking effect against both UVA and UVB compared with conventional UV blockers.

Description

technical field [0001] The present invention relates to a silica airgel composite comprising a hydrophilic surface-modified hydrophobic silica airgel and an organic UV blocking agent supported in the pores of the silica airgel. Background technique [0002] Sunlight is roughly divided into visible light, infrared light, and ultraviolet light according to the length of the wavelength. Among them, ultraviolet light is light shorter than violet light of visible light, is called ultraviolet light (UV), and is divided into three regions. UVA is the main cause of skin darkening, and causes wrinkles and accelerates aging by penetrating into the dermis of the skin and inhibiting the regenerative function of the skin. UVB has a shorter wavelength than UVA and does not penetrate the dermis, but causes erythema and burns, thickens the stratum corneum, dries the skin and roughens the skin surface, and produces melanin to cause discoloration, freckles, and age spots, etc. To protect th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61K8/25A61K8/37A61K8/368A61K8/04A61Q17/04A61Q19/00
CPCA61K8/04A61K8/25A61K8/368A61K8/37A61Q17/04A61Q19/00A61K8/0279A61K8/35A61K2800/412A61K8/496A61K8/4966A61K8/042A61K2800/41A61K8/345A61K8/347A61K8/362A61K8/44A61K9/12
Inventor 金哲焕朴娟周金慧玟李滋恩
Owner 阿斯汀株式会社
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