Irregular Silica Particles for Resin Adhesion
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Solution Overview
Problem
Silica particles used in various applications face challenges in maintaining flowability and durability due to their shape and size, as they tend to become spherical and lose adhesiveness when small, or become fragile and easily damaged when large, making it difficult to enhance the strength and flowability of attachment targets.
Innovation Solution
Silica particles with a volume average size of 100 nm to 500 nm, an average circularity degree of 0.5 to 0.85, and a ratio of circle equivalent diameters to maximum heights of 1.5 to 1.9 are developed, providing an irregular shape that maintains flowability and durability by resisting mechanical loads and attachment to surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If silica particles are made small to enhance flowability, then flowability is improved, but adhesiveness is lost
Solution Approach 1:
The patent applies parameter changes by precisely controlling the particle size within 100-500 nm range and circularity degree within 0.5-0.85, transforming the silica particle properties to achieve both good flowability and adhesiveness simultaneously. This resolves the contradiction by finding an optimal parameter range where both requirements are satisfied.
Solution Approach 2:
The patent introduces the aspect ratio (Da/H ratio of 1.5-1.9) as an additional dimensional parameter to control particle morphology. By controlling not just size but also shape dimensions, the invention achieves particles that maintain flowability while enhancing adhesiveness through controlled irregularity.
2Strength
If silica particles are made large to enhance strength, then strength is improved, but durability deteriorates due to increased fragility
Solution Approach 1:
The patent resolves this contradiction by optimizing the particle size parameter within 100-500 nm and circularity degree within 0.5-0.85, achieving a balance where particles have sufficient strength while maintaining durability through controlled morphology that resists mechanical damage.
Solution Approach 2:
The patent applies asymmetry by controlling the circularity degree to be 0.5-0.85, creating particles with controlled irregular shapes rather than perfect spheres. This asymmetric morphology enhances both strength and durability by distributing mechanical stresses more effectively.
3Ease of manufacture
If silica particles become spherical to simplify shape, then manufacturing is easier, but adhesiveness is reduced
Solution Approach 1:
The patent resolves this contradiction by precisely controlling the circularity degree parameter within 0.5-0.85, creating particles with controlled irregularity that maintain manufacturing feasibility while significantly improving adhesiveness compared to perfectly spherical particles.
Data Source
AI summary
Disclosed are silica particles having a volume average particle size of from about 100 nm to about 500 nm, an average circularity degree of from about 0.5 to about 0.85, and an average value of the ratios of circle equivalent diameters Da of the silica particles obtained by a flat image analysis to maximum heights H of the silica particles obtained by a stereoscopic image analysis of more than 1.5 and less than 1.9.