Oil-Based Solid Sunscreen Composition for Water Resistance
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Solution Overview
Problem
Existing sunscreen compositions struggle to maintain ultraviolet protection under conditions of sweat or water exposure, and there is a demand for non-chemical, highly water-resistant formulations.
Innovation Solution
An oil-based solid cosmetic comprising a gelling agent, a silicone-based surfactant, and an ultraviolet scattering agent, with specific ratios and properties, enhances water resistance and sunscreen efficacy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If emulsified compositions containing ultraviolet absorbers are used, then ultraviolet protection effects are achieved, but water resistance is poor and the composition is removed by sweat or water
Solution Approach 1:
The patent changes the physical state parameter from emulsified (liquid) to solid cosmetic form, and adjusts the chemical composition by replacing ultraviolet absorbers with ultraviolet scattering agents, while optimizing the ratio of silicone-based surfactant to ultraviolet scattering agent to achieve both UV protection and water resistance
Solution Approach 2:
The patent replaces the chemical absorption mechanism (ultraviolet absorbers) with a physical scattering mechanism (ultraviolet scattering agents), achieving non-chemical UV protection that is more resistant to water and sweat
2Object-affected harmful factors
If non-chemical type sunscreen compositions with ultraviolet scattering agents are used, then skin irritation is suppressed, but water resistance is insufficient
Solution Approach 1:
The patent creates a composite solid cosmetic formulation combining silicone-based surfactants with ultraviolet scattering agents in specific ratios, where the silicone-based surfactant forms a water-resistant matrix that maintains the scattering agent's UV protection function while providing excellent water and sweat resistance
Solution Approach 2:
The patent optimizes the HLB value and concentration ratio of the silicone-based surfactant to achieve the right balance between non-chemical UV protection and water resistance, creating a solid cosmetic that resists water and sweat while maintaining skin compatibility
3Stability of the object's composition
If stick-type sunscreen compositions are used, then water resistance is improved, but the formulation is complex and manufacturing is difficult
Solution Approach 1:
The patent extracts and eliminates the need for complex emulsification systems and multiple surfactant combinations by using a single type of silicone-based surfactant in a solid cosmetic formulation, simplifying the manufacturing process while maintaining water resistance
Solution Approach 2:
The patent simplifies the formulation by changing from liquid emulsified compositions to solid cosmetic form, reducing the number of components and simplifying manufacturing while achieving superior water resistance through the solid state and optimized surfactant-to-scattering-agent ratio
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 cosmetic achieves excellent water resistance and sunscreen protection, maintaining its effectiveness even when exposed to sweat or water.
Implementation Method 1
sunscreen compositions contain ultraviolet absorbers and ultraviolet scattering agents, which block the penetration of UVA and UVB into the skin
Implementation Method 2
a silicone-based surfactant (B)... a ratio B/C of a content of the component (B) to a content of the component (C) contained in the oil-based solid cosmetic is 0.01 to 0.5
Implementation Method 3
a gelling agent (A)... a content of the component (A) is 3 to 30 mass %
Data Source
AI summary
provided is an oil-based solid cosmetic for sunscreen use that exhibits excellent water resistance. An oil-based solid cosmetic including a gelling agent (A), a silicone-based surfactant (B) that functions as a water resistance improving agent, and an ultraviolet scattering agent (C). Here, a ratio B/C of the content of the component (B) to the content of the component (C) contained in the oil-based solid cosmetic is 0.01 to 0.5.