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A light-colored catechol lignosulfonate sunscreen microcapsules and its preparation and application

A technology of lignosulfonate and catechol, applied in the field of fine chemicals, can solve the problems of poor free radical scavenging ability, limited application in the field of sunscreen, poor stability of sunscreen agents, etc., and achieves good biocompatibility, Improve the anti-photolysis performance and solve the effect of poor water resistance

Active Publication Date: 2022-06-14
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The preparation of existing lignin-based sunscreens mainly uses alkali lignin and enzymatic lignin as raw materials. The color of these two types of lignin is relatively dark. It has a lighter color than enzymatic lignin, but because lignin sulfonate itself is easy to cause demulsification of the cream body, the stability of the prepared sunscreen is worse than that of general lignin sunscreen, thus limiting its use. Application in the field of sun protection
In addition, lignosulfonate itself has a low phenolic hydroxyl content, so the free radical scavenging ability is poor, and the absorption ability in the ultraviolet region is limited.

Method used

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  • A light-colored catechol lignosulfonate sunscreen microcapsules and its preparation and application
  • A light-colored catechol lignosulfonate sunscreen microcapsules and its preparation and application
  • A light-colored catechol lignosulfonate sunscreen microcapsules and its preparation and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] (1) 10g of sodium lignosulfonate and 1.5g of sodium sulfite dissolved in 30ml, 10wt% NaOH solution, 90 °C for condensation reflux reaction for 1 hour, cooled to room temperature after the end of the reaction, the reaction liquid in pure water for dialysis purification treatment, after dialysis the sample solution was concentrated and dried to obtain a phthalol lignosulfonate solid powder.

[0053](2) 0.21g of catechol lignosulfonate dissolved in 6.79g of ultrapure water, prepared to obtain a solution of 5wt%, added 3g of ethylhexyl methoxycinnamate and avobenzone (mass ratio of 4:1) mixture and 0.7g Tween, ultrasonic cavitation of 400W state for 3min, to obtain a bioadhesive microencapsulant emulsion of catechol lignosulfonate / chemical sunscreen, 10000r / min centrifugation for 30min, to obtain phthalcinol lignosulfonate / Bioadhesive microcapsules of chemical sunscreens. The microcapsules were mixed with blank creams without sunscreen active ingredients (Nivea Deep Moist...

Embodiment 2

[0060] (1) 10g of magnesium lignosulfonate and 2g of sodium sulfite were dissolved in 30mL of 15wt% NaOH solution, condensed reflux reaction at 120 °C for 1 hour, cooled to room temperature after the end of the reaction, the reaction liquid was purified by dialysis in pure water, and the sample solution was concentrated and dried after dialysis to obtain a solid calcium of catechol lignosulfonate.

[0061](2) 0.21g of catechol lignosulfonate dissolved in 6.79g of ultrapure water, prepared to obtain a solution of 3wt%, added 4g of humolefin and avobenzone (mass ratio of 4:1) mixture and 1g Tween, ultrasonic cavitation of 5min in the state of ultrasonic power of 600W, centrifugation of 30min, 8000r / min to obtain a bioadhesive microcapsules of phthalcin lignosulfonate / chemical sunscreen. The microcapsules were mixed with blank creams without sunscreen active ingredients (Nivea Deep Moisturizing Hand Cream, Nivea (Shanghai) Co., Ltd.) to produce a bio-adhering microcapsule of catech...

Embodiment 3

[0064] (1) 10g of sodium lignosulfonate and 0.7g of sodium metabisulfite were dissolved in 40mL of 5wt% NaOH solution, condensed reflux reaction at 70 °C for 2.5 hours, cooled to room temperature after the reaction, the reaction liquid was purified in pure water for dialysis, and the sample solution was concentrated and dried after dialysis to obtain a solid calcium of lignosulfonate.

[0065] (2) 0.6g of catechol lignosulfonate dissolved in 6.4g of ultrapure water, prepared to obtain a solution of 3wt%, added 3g of ethylhexyl methoxycinnamate and avobenzone (mass ratio of 4:1) mixture and 0.3g of sucrose ester, ultrasonic cavitation of 3min in the state of ultrasonic power of 400W, centrifugation of 5000r / min for 40min, to obtain a bioadhesive microcapsules of catechol lignosulfonate / chemical sunscreen. The microcapsules were mixed with blank creams without sunscreen active ingredients (Nivea Deep Moisturizing Hand Cream, Nivea (Shanghai) Co., Ltd.) to produce a bio-adhering mi...

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Abstract

The invention discloses a light-colored catechol lignosulfonate sunscreen microcapsule and its preparation and application. The invention adopts vulcanization method to modify lignosulfonate to prepare catechol lignosulfonate, and then carries out ultrasonic cavitation to catechol lignosulfonate, sunscreen agent and surfactant to prepare catechol lignosulfonate Diphenol lignosulfonate / chemical sunscreen microencapsulated emulsion. The preparation process of the lignin / chemical sunscreen microcapsules in the present invention is green and environmentally friendly, with low cost and excellent ultraviolet absorption performance. Traditional sunscreens have problems such as poor water resistance, high pollution in the preparation process, and easy penetration into the skin to harm the human body.

Description

Technical field [0001] The present invention belongs to the field of fine chemicals, specifically relates to a light-colored catechol lignosulfonate sunscreen microcapsulfonate and its preparation and application. Background [0002] Internationally, the light radiation with a wavelength between 10 and 400 nm is called ultraviolet radiation. According to international practice, ultraviolet radiation can be divided into UVA band (320~400nm), UVB band (290~320nm), UVC band (200~290nm), EUV (10-100nm). Prolonged exposure to UV radiation can cause skin sunburn, aging and even skin cancer. EUV and UVC have been absorbed by the ozone layer at high altitudes, while 1% to 10% of UVB and about 90% or more of UVA can still pass through the atmosphere to reach the Earth's surface. The penetration performance of ultraviolet rays in the UVB band is weak, and when it is irradiated to the human body, most of them are absorbed by the epidermal cells of the human body, but due to the relatively h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61K8/72A61K8/11A61K8/37A61P17/04C08H7/00
CPCA61K8/72A61K8/37A61K8/11A61P17/04C08H6/00A61K2800/592
Inventor 钱勇张艾程邱学青杨东杰杨换仙楼宏铭
Owner SOUTH CHINA UNIV OF TECH
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