Zinc Oxide Composite Particles with Polysilsesquioxane Coating
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Solution Overview
Problem
Current zinc oxide-containing composite particles lack sufficient acid resistance, which affects their performance in cosmetic and ultraviolet-shielding applications.
Innovation Solution
A zinc oxide-containing composite particle is developed, comprising a porous silica particle with zinc oxide particles enclosed within and a polysilsesquioxane coating layer, which enhances acid resistance and prevents zinc ion dissolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If zinc oxide is incorporated in cosmetics for UV-A shielding, then UV-A shielding property is improved, but zinc ion dissolution occurs which impairs product properties
Solution Approach 1:
The patent introduces an intermediary substance (coating material such as silica, alumina, or polymer coatings) that mediates between zinc oxide and the cosmetic environment. This coating layer acts as a barrier that prevents direct contact between zinc ions and the cosmetic formulation, thereby eliminating the harmful dissolution effect while preserving the UV-A shielding function of zinc oxide.
Solution Approach 2:
The patent employs composite material structures where zinc oxide is combined with coating materials to form a core-shell or composite particle system. The composite structure integrates the UV-blocking capability of zinc oxide with the protective and stabilizing properties of the coating material, achieving both function preservation and harm elimination.
2Object-generated harmful factors
If conventional coating methods are used on zinc oxide particles, then zinc ion dissolution is inhibited, but acid resistance remains insufficient
Solution Approach 1:
The patent applies parameter changes by modifying the chemical composition and structural properties of the coating layer. Specifically, the coating materials are selected and formulated to have high acid resistance parameters, and the coating thickness and cross-linking density are optimized to enhance protective performance in acidic cosmetic environments while maintaining inhibition of zinc ion dissolution.
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 particle exhibits high acid resistance, allowing for uniform dispersion in acidic solutions and maintaining UV-A shielding properties over time, even in aqueous cosmetics.
Implementation Method 1
a coating layer covering the porous silica particle, the coating layer containing a polysilsesquioxane
Implementation Method 2
zinc oxide particles enclosed within the porous silica particle
Data Source
Figure 1
AI summary
A zinc oxide-containing composite particle (1) according to the present invention includes a porous silica particle (10), zinc oxide particles (20), and a coating layer (30). The zinc oxide particles (20) are enclosed within the porous silica particle (10). The coating layer (30) covers the porous silica particle (10) and contains a polysilsesquioxane. The zinc oxide-containing composite particle (1) can thus be provided as a particle having high acid resistance.