Silicon Oxide Coated UV Particles with Functional Groups
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Solution Overview
Problem
Aqueous cosmetics using zinc oxide particles coated with silicon oxide struggle to achieve desired ultraviolet-shielding properties when forming a coated film.
Innovation Solution
Coating ultraviolet-shielding particles with a silicon oxide layer that includes functional groups such as alkyl, alkenyl, or cycloalkyl groups, with a content of 0.0001% to 0.30% by mass, to enhance the ultraviolet-shielding properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If zinc oxide particles coated with silicon oxide are used in aqueous cosmetics, then the cosmetic has a fresh sensation and non-sticky texture, but the ultraviolet-shielding property cannot be obtained when forming a coated film
Solution Approach 1:
The patent applies parameter changes by introducing functional groups (alkyl, alkenyl, or cycloalkyl groups) into the silicon oxide coating layer. This chemical modification changes the surface properties of the coating, enabling it to form a effective ultraviolet-shielding film while maintaining the aqueous cosmetic's fresh sensation and non-sticky texture. The functional groups modify the coating's ability to interact with both the aqueous medium and ultraviolet radiation.
Solution Approach 2:
The patent creates a composite material structure by combining zinc oxide particles with a silicon oxide coating that contains functional groups. This composite structure integrates the ultraviolet-shielding capability of zinc oxide with the film-forming and protective properties of the functionalized silicon oxide coating, achieving both good texture and reliable ultraviolet-shielding performance in aqueous cosmetics.
2Ease of manufacture
If a silicon oxide coating is applied to ultraviolet-shielding particles, then the particles can be mixed into aqueous cosmetics, but the coating does not form an effective ultraviolet-shielding film
Solution Approach 1:
The patent modifies the silicon oxide coating by introducing functional groups (alkyl, alkenyl, or cycloalkyl groups) with specific content ranges (0.0001-0.30% by mass). This parameter change enhances the coating's film-forming capability and ultraviolet-shielding effectiveness while maintaining its compatibility with aqueous cosmetic formulations, allowing the particles to be easily mixed in without compromising film formation.
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 approach results in excellent ultraviolet-shielding performance even in aqueous cosmetics and oil-in-water cosmetics, suppressing agglomeration and maintaining stability and effectiveness.
Implementation Method 1
an ultraviolet-shielding particle coated with silicon oxide formed by coating a surface of the ultraviolet-shielding particle with a silicon oxide coat
Data Source
AI summary
In an ultraviolet-shielding particle coated with silicon oxide of the present invention, a surface of the ultraviolet-shielding particle is coated with a silicon oxide coat, at least one functional group selected from the group consisting of an alkyl group, an alkenyl group, and a cycloalkyl group is present on a surface of the silicon oxide coat, and a content of the functional group is 0.0001% by mass or more and 0.30% by mass or less.