A kind of chestnut shell airgel and its preparation method and application

A technology of chestnut shell and aerogel

Active Publication Date: 2022-05-24
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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  • A kind of chestnut shell airgel and its preparation method and application

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Experimental program
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Effect test

Embodiment 1

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

[0032] (2) Chestnut shell cellulose and 1-propyl-3-methylimidazolium chloride in a mass ratio of 1:15, swell at 120 ° C for 2 hours, add a sulfuric acid solution with a volume fraction of 10% of the ionic liquid mass, React at 90°C for 3h, centrifuge at 5000r / min for 10min, dialyze it 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 hydrogen peroxide with a mixed liquid fraction of 0.8% as an initiator, r...

Embodiment 2

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

[0039] (2) The mass ratio of chestnut shell cellulose and 1-propyl-3-methylimidazolium chloride is 1:20, swelling at 120 °C for 2 h, adding 3 times the mass of ionic liquid with a volume fraction of 10% sulfuric acid solution. React at 90°C for 3h, centrifuge at 10000r / min for 10min, dialyze in distilled water for 48h (molecular weight cut-off 5000Da) to obtain a nanocellulose suspension; fully mix it with 30% lauric acid ethanol solution of 3 times its volume, and then Add 1.5% hydrogen peroxide in the mixed liquid as an i...

Embodiment 3

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

[0046] (2) The mass ratio of chestnut shell cellulose and 1-propyl-3-methylimidazolium chloride is 1:18, swelling at 110°C for 2.5h, adding 9% sulfuric acid solution with twice the mass of ionic liquid, React at 80°C for 4h, centrifuge at 8000r / min for 20min, dialyze it in distilled water for 36h (molecular weight cut-off 4000Da) to obtain a nanocellulose suspension; fully mix it with 20% 20% lauric acid ethanol solution with twice its volume, Then add hydrogen peroxide with a fraction of 1.0% of the mixed liquid as an initiator, react at 50 °C for 1...

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Abstract

The invention discloses a chestnut shell airgel, a preparation method and application thereof, and belongs to the technical field of cosmetics. The airgel extracts cellulose from chestnut shells to make nanocellulose and hydrophobically modify it to prepare a composite airgel of modified cellulose carrying nano-zinc oxide, Lycium barbarum polysaccharide and almond polypeptide, and then compatible Hyaluronic acid, squalane, ferulic acid, vitamin C, silica, glycerin, butylene glycol, essential oil, sucrose ester, and deionized mixture were mixed and homogenized to prepare chestnut shell airgel sunscreen. It can be added to sunscreen cosmetics, which has the effects of lowering body surface temperature, increasing sun protection index, enhancing moisturizing and anti-aging skin.

Description

technical field [0001] The invention belongs to the field of cosmetics, and in particular relates to a chestnut shell aerogel sunscreen, a preparation method thereof, and 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 is highly penetrating, and more than 98% can penetrate the ozone layer to reach the surface of the earth, destroying the dermis and elastic fibers of the skin, resulting in tanning. Injuries, pigmentation and skin aging (such as fine lines, wrinkles, sagging skin, etc.); and 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 tan Skin or redness and peeling of the skin. In the distribution of ultraviolet energy, UVA is 15 times that of UVB, so preventing skin aging is far more important tha...

Claims

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Application Information

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Patent Type & Authority Patents(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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