Chestnut shell aerogel as well as preparation method and application thereof

A technology of chestnut shell and airgel, which is applied in the direction of pharmaceutical formulations, cosmetic preparations, dressing preparations, etc., can solve problems such as poor quality, easy destruction of natural ingredients, blocking ultraviolet rays and sunscreen effects, and achieve body surface temperature The effect of falling, excellent sun protection performance, and strong absorption capacity

Active Publication Date: 2021-05-14
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Patent CN111228148A discloses a natural tea oil sunscreen, which consists of 7-15 parts of tea oil, 5-10 parts of aloe juice, 6-8 parts of calendula extract, 5-10 parts of cucumber juice, 1-3 parts of glycerin, Composed of 1-2 parts of seaweed and 1-2 parts of mint, it does not irritate the skin, but the natural ingredients are easily destroyed, and the effect of blocking ultraviolet rays and sunscreen is not good
[0005] The aerogels that form a network structure through natural ingredients to block ultraviolet rays and have good breathable and heat-insulating functions have not been reported in cosmetics such as sunscreens.

Method used

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  • Chestnut shell aerogel as well as preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0031] (1) Chestnut shell 1kg, add dilute nitric acid with a volume fraction of 8% and react at 90°C for 1 h, the solid-liquid ratio is 1:10 (g / mL), filter, wash with water until neutral, add 4% nitric acid to the obtained filter residue 10L of NaOH aqueous solution and 10L of 8% hydrogen peroxide aqueous solution were reacted at 60°C for 3h, filtered, washed with water until neutral, and dried at 50°C for 8h to obtain chestnut shell cellulose;

[0032] (2) The mass ratio of chestnut shell cellulose and 1-propyl-3-methylimidazolium chloride is 1:15, swell at 120° C. for 2 hours, add a 10% sulfuric acid solution with a volume fraction of 1 times the mass of the ionic liquid, React at 90°C for 3h, centrifuge at 5000r / min for 10min, and dialyze in distilled water for 24h (molecular weight cut-off 3000Da) to obtain a nanocellulose suspension; fully mix it with 15% lauric acid ethanol solution with a mass fraction of 1 times its volume, Then add 0.8% hydrogen peroxide in the mixed ...

Embodiment 2

[0038] (1) Chestnut shell 1kg, add dilute nitric acid with a volume fraction of 12% and react at 70°C for 3 hours, the solid-to-liquid ratio is 1:30 (g / mL), filter, wash with water until neutral, and add a mass fraction of 6% nitric acid to the obtained filter residue 30L of NaOH aqueous solution and 30L of 10% hydrogen peroxide aqueous solution were reacted at 60°C for 2h, filtered, washed with water until neutral, and dried at 60°C for 3h to obtain chestnut shell cellulose;

[0039] (2) The mass ratio of chestnut shell cellulose to 1-propyl-3-methylimidazolium chloride salt is 1:20, and it is swelled at 120° C. for 2 hours, and a 10% sulfuric acid solution with a volume fraction of 3 times the mass of the ionic liquid is added. Reaction at 90°C for 3h, centrifugation at 10000r / min for 10min, dialysis in distilled water for 48h (molecular weight cut-off 5000Da), to obtain a nanocellulose suspension; fully mix it with 30% lauric acid ethanol solution with a mass fraction 3 time...

Embodiment 3

[0045] (1) Chestnut shell 1kg, add dilute nitric acid with a volume fraction of 10% and react at 80°C for 2 hours, the solid-to-liquid ratio is 1:20 (g / mL), filter, wash with water until neutral, add 5% mass fraction of nitric acid to the obtained filter residue 20L of NaOH aqueous solution and 20L of 9% hydrogen peroxide aqueous solution were reacted at 50°C for 2.5h, filtered, washed with water until neutral, and dried at 55°C for 5h to obtain chestnut shell cellulose;

[0046] (2) The mass ratio of chestnut shell cellulose to 1-propyl-3-methylimidazolium chloride salt is 1:18, swell at 110°C for 2.5h, add 9% sulfuric acid solution with a volume fraction twice the mass of the ionic liquid, React at 80°C for 4h, centrifuge at 8000r / min for 20min, and dialyze in distilled water for 36h (molecular weight cut-off 4000Da) to obtain a nanocellulose suspension; fully mix it with a 20% lauric acid ethanol solution with a mass fraction twice its volume, Then add hydrogen peroxide wit...

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Abstract

The invention discloses chestnut shell aerogel as well as a preparation method and application thereof, belonging to the technical field of cosmetics. The aerogel is prepared by the following steps: extracting cellulose from chestnut shells, preparing nano-cellulose, performing hydrophobic modification on the nano-cellulose, preparing composite aerogel of modified cellulose carrying nanometer zinc oxide, lycium barbarum polysaccharide and almond polypeptide, then mixing the composite aerogel with hyaluronic acid, squalane, ferulic acid, vitamin C, silica, glycerol, butanediol, essential oil, sucrose ester and deionized water, and performing homogenization so as to prepare a chestnut shell aerogel sunscreen cream. The chestnut shell aerogel can be added into sunscreen cosmetics, and has the effects of reducing body surface temperature, improving a sunscreen index, enhancing moisture retention and resisting skin photoaging.

Description

technical field [0001] The invention belongs to the field of cosmetics, and in particular relates to a chestnut shell airgel sunscreen, a preparation method thereof and an application in sunscreen cosmetics. Background technique [0002] The ultraviolet rays emitted by the sun can be divided into three types: UVA, UVB, and UVC according to different wavelengths. Among them, UVA has strong penetrability, and more than 98% can reach the earth's surface through the ozone layer, destroying the skin's dermis and elastic fibers, resulting in sunburn. Injuries, pigmentation, and skin aging (such as fine lines, wrinkles, skin sagging, etc.); while most of UVB will be absorbed by the ozone layer, moderate exposure will promote human mineral metabolism and the formation of vitamin D, but excessive exposure will lead to tanning skin or make the skin red, swollen and peeling. In the distribution of ultraviolet energy, UVA is 15 times that of UVB, so anti-aging skin is far more importan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61K8/73A61K8/64A61K8/27A61K8/04A61Q17/04A61Q19/00A61Q19/08
CPCA61K8/731A61K8/73A61K8/645A61K8/27A61K8/042A61Q17/04A61Q19/00A61Q19/08A61K2800/413A61K2800/5922A61K2800/244
Inventor 叶勇唐小月
Owner SOUTH CHINA UNIV OF TECH
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