Phase-inversion sunscreen composition and preparation method thereof

Abstract

The invention discloses a phase-inversion sunscreen composition and a preparation method thereof. The composition comprises the following components by weight percentage: 50%-70% of water, 3%-15% of polyol, 0.03%-2% of moisturizing agent, 0.1%-1% of thickener, and 15% of organic sunscreen ‑35%, inorganic sunscreen 1‑15%, dispersant 5‑18%, film former 1‑6%, skin feel regulator 1‑6%, preservative 0.1‑3%, emulsifier 1.0‑6%. The composition contains ethylhexyl methoxycinnamate, octocrylene, ethylhexyl salicylate, homosalate, their combination, more preferably contains benzophenone-3, benzophenone- 4. One or more combinations of avobenzone. The invention adopts the phase inversion technology and the technology of reducing stickiness and oily feeling to prepare a kind of skin that has a moist and refreshing feeling when it touches the skin. sunscreen composition.

Description

technical field [0001] The invention belongs to the field of daily chemicals, and relates to a sunscreen cosmetic. By using phase inversion technology and skin feel adjustment technology, the sunscreen composition has a moisturizing and refreshing feeling when it contacts the skin. It has high sun protection value, high waterproof and anti-perspiration effect. Background technique [0002] Sunscreen products are a large category of products in cosmetics. They have the functions of isolating, blocking, and transforming most of the damage caused by ultraviolet rays in sunlight to the skin, and are loved by the majority of people. [0003] Ultraviolet radiation in sunlight can be divided into three bands according to their wavelengths: UV-A (315-400nm), UV-B (280-315nm) and UV-C (below 280nm). Since the atmospheric ozone layer has little absorption of UV-A, the change of UV-A radiation has basically nothing to do with the change of the ozone layer; while UV-C is completely opp...

AI Technical Summary

Problems solved by technology

Water-in-oil cosmetic sunscreen has the characteristics of high organic sunscreen content, stickiness and non-volatility, etc. It has the advantages of high sun protection index, strong water resistance, and is not easy to fall off, but it gives the skin greasy, sticky, difficult to apply and other disadvantages.

For example, patent CN104780894A Yongli invented water-in-oil emulsified sunscreen cosmetics by Buzi, etc. The advantage of this invention is that it has high UV protection ability, and the sticky feeling brought by organic sunscreens can be reduced by adding a large amount of low-viscosity silicone oil, but this oil The water-in-type emulsion contains high oil content (up to 43%) but has no components that reduce viscosity and oily feeling. Not only the oily feeling is obvious but also the drying is slow, which reduces the feeling of use and makes users feel greasy.

[0007] Compared with water-in-oil cosmetic sunscreen, oil-in-water cosmetic sunscreen has a refreshing skin feel, easy to apply on the skin surface, and less greasy feeling, but its water resistance is poor, and it is easy to be washed away by sweat and cannot last long. Sunscreen function; such as the sunscreen oil-in-water emulsified cosmetics invented by Taiichi Harada in the patent CN103298446A. The advantage of this invention is that zinc oxide can be evenly dispersed in the oil phase through the hydrophobic modification of zinc oxide, so that the entire emulsification system is stable, but This kind of oil-in-water emulsion has no water resistance, and it is easy to be washed off by water when the skin sweats or enters water, so it cannot achieve the effect of long-lasting sun protection

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