Synthesis and application of similar quaternized chitosan sunscreen

A technology of quaternized chitosan and sunscreen, which is applied in the direction of cosmetics, cosmetic preparations, dressing preparations, etc., can solve the problems of poor solubility, affecting hair luster, difficult to form protective film, etc., and achieve the goal of improving water solubility Effect

Inactive Publication Date: 2011-09-28
JIANGNAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] People have realized the importance of sun protection for hair, but the development of sunscreens for hair needs to solve the following problems: (1) Most of the sunscreens currently used are skin sunscreens, which have poor affinity and film-forming properties for hair. It is not easy to form a uniform protective film; (2) it must have a large solubility in water; (3) it will not produce

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  • Synthesis and application of similar quaternized chitosan sunscreen
  • Synthesis and application of similar quaternized chitosan sunscreen
  • Synthesis and application of similar quaternized chitosan sunscreen

Examples

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Embodiment Construction

[0035] The following examples will further illustrate the present invention.

[0036] Synthesis of 2-hydroxypropyltrimethylammonium chitosan

[0037] Add 1g of chitosan, 4g of 3-chloro-2-hydroxypropyltrimethylammonium chloride and 50ml of deionized water into a 250mL three-necked flask, slowly add 20ml of 0.5mol / L NaOH dropwise to the reaction system, 90℃ magnetic force The reaction was stirred for 30 hours, and the flocculent precipitate was precipitated with 3 times the volume of acetone to obtain 2-hydroxypropyltrimethylammonium chitosan.

[0038] Synthesis of quaternized chitosan sunscreen

[0039] Add 1g of 2-hydroxypropyltrimethylammonium chitosan and 50mL of dimethylsulfoxide into a 100mL round-bottomed flask. After magnetic stirring is fully swelled, 0.012mol of acid chloride (sulfonyl chloride) and 0.012mol of tris Ethylamine, magnetically stirred at room temperature, reacted for 24h, the product was precipitated with absolute ethanol, and after suction filtration, it was ex...

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Abstract

The invention relates to a synthesis method of similar quaternized chitosan sunscreen and an application of the quaternized chitosan sunscreen as hair sunscreen, belonging to the technical field of functional cosmetic. The product in the invention is obtained through the following two reaction steps: first step, 2-hydroxypropyltrimethyl ammonium chloride chitosan is synthesized from 3-chloro-2-hydroypropyltrimethyl amino and chitosan under alkali condition; second step, 2-hydroxypropyltrimethyl ammonium chloride chitosan is dissolved in dimethyl sulfoxide, and acyl chloride (sulfonyl chloride) and bind acid agent triethylamine are added in the solution to synthesize the final product quaternized chitosan sunscreen. Wherein, the acyl chloride (sulfonyl chloride) group grafted in the second step has quite strong ultraviolet absorption performance; besides, grafting quaternary ammonium group on the chitosan not only improves the water solubility of the chitosan and enlarges the application scope, but also enables the product to adhere to hairs with negative electricity. Measurement of tryptophan content in hairs proves that the product has sun-screening effect for hairs to some extent.

Description

Technical field [0001] The invention relates to the synthesis and application of a type of quaternized chitosan sunscreen, in particular to the preparation of a chitosan derivative which can be adsorbed on the hair and has the effect of absorbing ultraviolet rays and a preparation method thereof, belonging to the technical field of functional cosmetics. Background technique [0002] The factors that damage hair are generally divided into three categories: mechanical factors; chemical factors; environmental factors. Ultraviolet rays are considered the most harmful of all environmental factors. When hair is exposed to ultraviolet radiation, melanin will fade due to oxidation. In addition, sunlight radiation will also cause photodegradation of cystine, tyrosine, tryptophan and other groups in keratin, which will break the link between amino acids. , The basic structure of the hair is destroyed, the hair becomes dry, fragile, dull, and poor combability. [0003] Currently, few sunscr...

Claims

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Application Information

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IPC IPC(8): A61Q5/02A61Q5/12A61K8/73C08B37/08A61Q5/06
Inventor 杨成王心灵孙培冬曹光群
Owner JIANGNAN UNIV
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