Core-Shell Inorganic Oxide Particles for Coating Stability
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Solution Overview
Problem
Titanium oxide fine particles with small diameters used in coating solutions for optical lenses suffer from degradation in weather resistance and light resistance, leading to issues like film separation, yellowing, or bluing.
Innovation Solution
A dispersion liquid containing core-shell type inorganic oxide particles, where titanium-containing core particles are treated with a hydrate or oxide of zirconium, tin, niobium, barium, lanthanum, strontium, cerium, or lithium, and then coated with a composite oxide of silicon and aluminum, zirconium, or antimony, enhancing their surface properties and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If titanium oxide fine particles with small particle diameter are used in coating solutions, then transparency of the coating film is improved, but weather resistance and light resistance are degraded
Solution Approach 1:
The patent applies composite materials by creating core-shell type inorganic oxide particles where a titanium-containing core is surrounded by a protective shell layer. The core provides high refractive index for transparency, while the shell layer composed of silicon oxide and zirconium oxide protects against weather and light degradation, resolving the contradiction between transparency and reliability.
Solution Approach 2:
The patent uses nested structure by placing one material inside another - the titanium-containing metal oxide core is nested within the silica-zirconia shell layer. This nested configuration allows the inner core to provide optical properties while the outer shell provides protective functions, simultaneously achieving transparency and weather/light resistance.
2Illumination intensity
If titanium oxide fine particles with small particle diameter are used in coating solutions, then transparency of the coating film is improved, but film separation occurs due to high activity
Solution Approach 1:
The patent creates composite core-shell particles where the titanium-containing core is combined with a stabilizing shell layer of silicon oxide and zirconium oxide. This composite structure reduces the high surface activity of small titanium oxide particles while maintaining their transparency benefits, preventing film separation.
Solution Approach 2:
The shell layer acts as an intermediary between the highly active titanium oxide core and the external environment. This intermediate layer moderates the surface activity of the core particles, reducing their tendency to cause film separation while allowing the core to maintain its optical 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 treated particles exhibit improved dispersion stability, light resistance, and weather resistance, preventing film degradation and maintaining transparency and adhesion, while also enhancing the refractive index of the coating film.
Implementation Method 1
treating the surfaces of (a) fine particles of titanium-containing metal oxide serving as core particles with a hydrate and/or an oxide of at least one metal element selected from zirconium, tin, niobium, barium, lanthanum, strontium, cerium, and lithium to provide surface-treated particles
Implementation Method 2
covering the surfaces of the surface-treated particles with a composite oxide of silicon and at least one metal element selected from aluminum, zirconium, and antimony
Implementation Method 3
A dispersion liquid according to the present invention contains fine particles of core-shell type inorganic oxide
Data Source
AI summary
A dispersion liquid contains fine particles of core-shell type inorganic oxide that have high dispersion stability and transparency and allow for excellent light resistance and weather resistance by being mixed in a coating film. The fine particles are produced by treating the surfaces of (a) fine particles of titanium-containing metal oxide serving as core particles with a hydrate and/or an oxide of a metal element such as zirconium to provide surface-treated particles or fine particles of titanium-containing metal oxide having (b) an intermediate layer and by covering the surfaces of the surface-treated particles to form (c) a shell layer with a composite oxide of silicon and at least one metal element selected from aluminum, zirconium, and antimony.