Lignin Microcapsule UV Absorption and Skin Isolation
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Solution Overview
Problem
Chemical sun-screening agents face issues with photodegradation and skin irritation, and existing methods for encapsulating them often require additional additives that increase costs and potential harm.
Innovation Solution
A high-ultraviolet absorption lignin/chemical sun-screening agent microcapsule is developed using lignin as a wall material, prepared through a one-step emulsion crosslinking process with ultrasonic radiation, eliminating the need for emulsifiers and crosslinking agents, and enhancing UV absorption and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If chemical sun-screening agents are used, then UV absorption ability is improved, but photodegradation and skin irritation occur
Solution Approach 1:
The chemical sun-screening agent is segmented into microcapsules with lignin wall material, isolating the active ingredient from direct contact with skin while maintaining UV absorption functionality. The microcapsule structure divides the system into core (sun-screening agent) and shell (lignin wall), resolving the contradiction between effectiveness and harmful effects.
Solution Approach 2:
Lignin wall material acts as an intermediary between the chemical sun-screening agent and skin, preventing direct contact and subsequent harmful effects while allowing the agent to maintain its UV absorption function. The wall material mediates the interaction, eliminating skin irritation and photodegradation issues.
2Object-affected harmful factors
If existing encapsulation methods are used, then chemical sun-screening agents can be isolated from skin, but additional additives increase cost and potential harm
Solution Approach 1:
The method extracts and eliminates unnecessary additives (emulsifiers, crosslinking agents) from the encapsulation process, using only lignin wall material and water. This extraction of harmful components resolves the contradiction between achieving skin isolation and avoiding additive-related harm.
Solution Approach 2:
The system uses only naturally benign components (lignin and water) that serve the encapsulation function without requiring additional chemical additives. The lignin wall material self-assembles to form microcapsules, providing skin isolation without introducing harmful substances.
3Reliability
If physical sun-screening agents are used, then UV reflection is achieved, but skin comfort and affinity are poor
Solution Approach 1:
The invention changes the physical state and size parameters of the sun-screening system by creating microcapsules with specific size ranges (50-500 nm). This parameter change allows the chemical agent to behave more like physical agents in terms of skin penetration resistance, while maintaining chemical affinity and comfort properties.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The lignin/chemical sun-screening agent microcapsule exhibits improved UV absorption and stability, preventing photodegradation and skin irritation while maintaining the chemical sun-screening agent's effectiveness, with a simple and cost-effective preparation process.
Implementation Method 1
Lignin is a natural polymer compound widely present in the cell wall of plants. Many functional groups such as a benzene ring, a double bond, a carbonyl group and a phenolic hydroxyl group in the molecule of lignin determine that lignin can not only absorb ultraviolet rays
Implementation Method 2
combines a chemical sun-screening agent with a lignin solution, and prepares a lignin/chemical sun-screen microcapsule by one-step emulsion crosslinking by ultrasonic radiation
Implementation Method 3
The large number of phenolic hydroxyl groups present in the lignin molecule can form phenolic free radicals under ultrasonic radiation, which promote intermolecular cross-linking polymerization of lignin
Data Source
AI summary
The present invention, belonging to the technical field of chemical sun-screening agent preparation, discloses a high-ultraviolet absorption lignin/chemical sun-screening agent microcapsule using lignin as a wall material and a preparation method therefor. The method of the present invention comprises the following steps: (1) dissolving 1-20 parts by weight of lignin in 100-200 parts by weight of an aqueous solution with a pH of 12, adjusting the pH of the solution to 7-10, and then removing insoluble substances by filtration to obtain a lignin solution; and (2) mixing 10-50 parts by weight of the lignin solution in step (1) with 1-10 parts by weight of a chemical sun-screening agent, and performing ultrasonic radiation under a power of 200-1500 W for 10 s to 25 min to obtain a lignin/chemical sun-screening agent microcapsule emulsion. The lignin/chemical sun-screening agent microcapsule of the present invention has excellent ultraviolet absorption performance, can avoid photodegradation of the chemical sun-screening agent, and has good stability; and it effectively prevents the chemical sun-screening agent from directly contacting and hurting the skin, having great application prospects in the field of sun-screening skincare products.