Catechol Lignosulfonate Microcapsules for Sunscreen
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Solution Overview
Problem
Existing lignin-based sunscreen creams face issues with skin penetration due to small particle size and poor bio-adhesion, and lignosulfonate's limited UV absorption and stability, leading to inadequate protection and application challenges.
Innovation Solution
A method to modify lignosulfonate through sulfidation to increase phenolic hydroxyl groups, forming catechol lignosulfonate microcapsules with improved bio-adhesion and stability, using a mild reaction process to encapsulate sunscreen agents, enhancing UV protection and skin compatibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If lignin-based sunscreen creams are used, then UV protection is provided, but skin penetration occurs due to small particle size and poor bio-adhesion
Solution Approach 1:
The patent modifies the chemical structure of lignin by introducing catechol groups through sulfidation reaction, changing the functional groups from methoxy to phenolic hydroxyl. This parameter change enhances bio-adhesion to skin while maintaining UV protection capability, preventing skin penetration without compromising protective function
Solution Approach 2:
The patent creates a composite structure by combining modified lignin (catechol lignin) with sunscreen agents to form microcapsules. This composite material integrates the UV protection of lignin with the protective encapsulation of microcapsules, achieving both UV blocking and prevention of skin penetration
2Reliability
If lignosulfonate is used as sunscreen agent, then chemical sunscreen protection is provided, but UV absorption and stability are limited
Solution Approach 1:
The patent chemically modifies lignosulfonate by performing sulfidation reaction to convert methoxy groups into phenolic hydroxyl groups (catechol structure). This parameter change significantly enhances UV absorption capability and oxidative stability, transforming the limited performance of ordinary lignosulfonate into an effective sunscreen agent
Solution Approach 2:
The patent utilizes the phenolic hydroxyl groups introduced through sulfidation to enhance antioxidant activity. The catechol structure acts as a strong antioxidant that can scavenge free radicals and protect against oxidative damage, thereby improving the stability and UV absorption properties of the sunscreen formulation
Data Source
AI summary
Disclosed in the present invention are a light-colored catechol lignosulfonate sunscreen microcapsule, and a preparation therefor and the use thereof. According to the present invention, lignosulfonate is modified by using a vulcanization method to prepare catechol lignosulfonate, and the catechol lignosulfonate, a sunscreen agent and a surfactant are then subjected to ultrasonic cavitation to prepare a catechol lignosulfonate/chemical sunscreen agent microcapsule emulsion, The preparation process of the lignin/chemical sunscreen agent microcapsule of the present invention is environmentally friendly, has low costs and an excellent ultraviolet absorption performance, has a lighter color compared to other lignin-based sunscreen agents, and has a good biological adhesion and penetration resistance, which solves the problems of poor water resistance, greater pollution caused by the preparation process, easy penetration into the skin to harm the human body, etc. of conventional sunscreen agents.