Coated Flaky Titanate Particles for UV-Resistant Paints
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional luster pigments using plate-shaped titanate in organic solvent-based paints face issues with discoloration (yellowing) under UV exposure, compromising the silky and shading feelings of the paint film.
Innovation Solution
Coated plate-shaped titanate particles with an oxide and/or hydroxide of aluminum and an anionic surfactant on their surface, specifically a hydrocarbon-based or fluorine-based surfactant, are used to enhance dispersion stability and reduce yellowing in organic solvent-based paints.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If primary amine is used to disperse plate-shaped titanate in organic solvent-based paint, then dispersion stability and shading feeling are improved, but discoloration (yellowing) of the paint film occurs under UV exposure
Solution Approach 1:
The patent introduces an amine-modified silane compound as an intermediary substance that mediates between the plate-shaped titanate particles and the organic solvent-based paint. This compound provides both dispersion stability and UV resistance, resolving the contradiction by acting as a bridge that delivers multiple functions without causing yellowing.
Solution Approach 2:
The patent changes the chemical parameters of the surfactant by using amine-modified silane compounds with specific molecular structures (containing both amine groups and silane groups). This parameter change enables the surfactant to provide both dispersion stability and UV resistance, simultaneously addressing both requirements without the yellowing problem of conventional primary amines.
2Object-affected harmful factors
If primary amine is not used to avoid yellowing, then discoloration is reduced, but dispersion effect and shading feeling become insufficient
Solution Approach 1:
The amine-modified silane compound serves as an intermediary that provides the necessary dispersion stability without the harmful yellowing effect of conventional primary amines. The silane backbone provides UV resistance while the amine groups maintain dispersion capability.
Solution Approach 2:
The patent uses composite functionality by combining amine groups (for dispersion) and silane groups (for UV resistance) into a single surfactant molecule. This composite structure allows the material to simultaneously provide dispersion stability and resist yellowing, overcoming the trade-off between these two properties.
3Illumination intensity
If conventional luster pigment is used, then strong metallic luster is achieved, but particle feeling is strong and silky feeling is reduced
Solution Approach 1:
The patent applies local quality by using plate-shaped titanate particles with specific surface treatments that create different optical properties at different scales. The plate shape provides metallic luster at macro level while the surface coating reduces particle visibility at micro level, achieving both strong luster and silky feeling simultaneously.
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 coated particles achieve a paint film with improved silky and shading feelings while significantly reducing discoloration, making them suitable for automotive and plastic applications.
Implementation Method 1
an anionic surfactant exists on a particle surface of a plate-shaped titanate
Implementation Method 2
an oxide and/or hydroxide of aluminum and a specific surfactant exist on the particle surface of the plate-shaped titanate
Data Source
AI summary
Provided are: coated flaky titanic acid particles, which can form a design coating film with a good silky texture and shadowed appearance when flaky titanic acid is applied to an organic solvent-based paint and, which can also sufficiently suppress discoloration (yellowing) of the coating film even in a relatively severe environment, such as prolonged exposure to ultraviolet light; and a production method therefor.The surface of the flaky titanic acid particles has an oxide and/or hydroxide of aluminum, and an anionic surfactant present thereon. Preferably, the anionic surfactant is a hydrocarbon-based anionic surfactant having 5 or more carbon atoms in the main chain or a fluorinated anionic surfactant having 4 or more carbon atoms. Said production method comprises: a step for maintaining an aqueous slurry, which contains flaky titanic acid particles and an aluminum source, at a temperature of 50-95° C. inclusive and at a pH of 5-12 inclusive to treat the surface of the flaky titanic acid particles with an oxide and/or hydroxide of aluminum; and a subsequent step for mixing the obtained flaky titanic acid and an anionic surfactant in a solution.