Fine Titanate Compound Powder for Moisture-Resistant Dispersion
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Solution Overview
Problem
Existing titanate compound particle powders face issues with moisture adsorption, aggregation, and re-aggregation, leading to instability in dispersion, especially when used in smaller electronic components and high refractive index materials, and current surface treatment methods do not adequately address these issues.
Innovation Solution
A fine titanate compound particle powder with an average primary particle size of 10 to 70 nm, specific surface area of 30 m²/g or less, and treated with a polymer-type dispersant having an acid value of 10 or more, produced through a method involving a solvent that forms an azeotropic mixture with water, reducing moisture adsorption and promoting stable dispersion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the particle size is reduced to increase chemical activity, then the reactivity improves, but moisture adsorption increases causing composition change
Solution Approach 1:
A silane-based coupling agent is introduced as an intermediary substance between the fine titanate compound particles and moisture. The coupling agent forms a protective layer on the particle surface that prevents direct interaction between moisture and the particle surface, thereby reducing moisture adsorption while preserving the high chemical activity of fine particles.
Solution Approach 2:
The surface properties of the titanate compound particles are modified by changing the surface composition through silane treatment. This parameter change in surface chemistry reduces the affinity for moisture adsorption while maintaining the fine particle size and associated high reactivity.
2Adaptability or versatility
If fine particle powder is mixed with resin or solvent, then dispersibility is needed, but aggregation occurs due to moisture adsorption
Solution Approach 1:
The silane-based coupling agent serves as a mediator that prevents direct aggregation between fine titanate particles. By forming a protective surface layer, it reduces interparticle attraction forces caused by moisture, enabling better dispersion in resins and solvents without aggregation.
Solution Approach 2:
The surface of each particle is locally modified with silane treatment to create hydrophobic characteristics, while the bulk material maintains its original properties. This localized surface modification prevents aggregation at particle interfaces while preserving the overall material composition.
3Stability of the object's composition
If dispersant is added to maintain dispersion stability, then re-aggregation is prevented, but the amount of additive increases
Solution Approach 1:
The silane-based coupling agent acts as a built-in intermediary that provides long-term dispersion stability without requiring additional dispersants. The coupling agent's molecular structure includes both particle-affinity groups and solvent-compatible groups, creating steric and electrostatic barriers that prevent re-aggregation over time.
Solution Approach 2:
The silane-based coupling agent performs multiple functions simultaneously: it reduces moisture adsorption, prevents aggregation, and provides long-term dispersion stability. This multi-functionality eliminates the need for separate dispersant additives, reducing the total additive amount while maintaining dispersion stability.
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 solution results in a titanate compound powder with low moisture adsorption and re-aggregation, ensuring excellent dispersibility and stability in various solvents, suitable for applications in multilayer ceramic capacitors, anti-reflection films, and piezoelectric materials, with an efficient production method that reduces environmental impact.
Implementation Method 1
a titanate compound particle powder which has been surface-treated with a surface treatment agent
Implementation Method 2
moisture is adsorbed onto the particle surface
Data Source
AI summary
The present disclosure relates to a titanate compound particle powder that has been surface-treated using a surface treatment agent, and is characterized in that the titanate compound particle powder has an average primary particle size of 10 to 70 nm, a specific surface area of 30 m2/g or less, and an adsorption parameter of 15 or less as determined by water vapor adsorption measurement.