Composite UV-Blocking Powder to Minimize White Cast and Fine Dust
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Solution Overview
Problem
Existing cosmetic products using titanium dioxide and zinc oxide as sunscreens cause a severe white cast phenomenon and poor user experience due to small particle size, and they do not effectively block UV rays beyond the UVB region or protect against fine dust.
Innovation Solution
A composite powder is developed with a UV-blocking coating layer containing ZnO on a sheet-like TiO2 substrate, treated with silane or silica compounds to block UV rays in UVA and UVB regions and repel fine dust particles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If titanium dioxide or zinc oxide is used as sunscreen with small particle size, then UV protection is improved, but white cast phenomenon and poor user experience occur
Solution Approach 1:
The patent divides the sunscreen function into two separate components: TiO2 particles for UVB protection and ZnO particles for UVA protection. This segmentation allows each component to be optimized for its specific function while using larger particle sizes (1-150 μm) that reduce white cast and improve user experience compared to traditional small particle sunscreens
Solution Approach 2:
The patent creates a composite powder system combining TiO2 and ZnO particles with specific size ranges (TiO2: 1-150 μm, ZnO: 1-10 μm). This composite material approach enables broad-spectrum UV protection (UVA and UVB) while the controlled particle sizes minimize the white cast phenomenon and improve cosmetic appearance and user experience
2Reliability
If conventional sunscreens are used, then UVB protection is achieved, but UVA protection and fine dust blocking are insufficient
Solution Approach 1:
The patent enhances the versatility of the sunscreen composition by adding silane compounds or silica compounds to the TiO2/ZnO composite. These additional components provide fine dust blocking capability alongside UV protection, allowing the single composition to serve multiple functions: UVB blocking (TiO2), UVA blocking (ZnO), and fine dust blocking (silane/silica compounds), thereby eliminating the need for separate products
3Reliability
If small particle size sunscreen is used, then UV protection is enhanced, but adhesion and user experience deteriorate due to stiffness
Solution Approach 1:
The patent optimizes the particle size parameters of both TiO2 (1-150 μm) and ZnO (1-10 μm) to achieve a balance between UV protection and user experience. The larger particle sizes improve adhesion and reduce the stiff feeling on skin compared to conventional small particle sunscreens, while still maintaining effective UV blocking capability. The specific size ranges are carefully selected to minimize white cast while preserving protective function
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 composite powder provides effective UV protection in both UVA and UVB regions, blocks fine dust, improves adhesion and user experience by minimizing white cast and stickiness, and enhances cosmetic product quality.
Implementation Method 1
a UV-blocking coating layer which is formed on the surface of the sheet-like substrate and contains ZnO... protect UV rays in the UVA and UVB regions
Implementation Method 2
subjected to treatment with a silane compound or silica compound to block the infiltration of fine dust into the skin through the repulsion force against charged particles in the fine dust
Data Source
AI summary
A composite powder according to an embodiment of the present disclosure has excellent UV blocking effect. The composite powder includes an ultraviolet ray-blocking coating layer containing ZnO on the surface of the plate-shaped substrate containing TiO2, thereby enabling the blocking of ultraviolet rays in the UVA and UVB regions, and is also expected to block fine dust through treatment with a silane compound or a silica compound.