Composite Particles with Silica Adhesion via Cellulose Adsorption
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Solution Overview
Problem
Existing methods for producing composite particles with silica particles result in weak adhesion to polymer particles, leading to silica particles easily falling off, which limits their application in coatings and other surface treatments.
Innovation Solution
A method involving aqueous suspension polymerization of polymerizable monomers in the presence of silica particles and a water-soluble cellulose compound that adsorbs onto the silica surfaces, enhancing the adhesion of silica particles to polymer particles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If silica particles are adhered to polymer particle surfaces to improve hydrophilicity and hardness, then the particles can be dispersed in aqueous media and scratch resistance improves, but the silica particles easily fall off the particle surfaces
Solution Approach 1:
The patent introduces a silane coupling agent as an intermediary substance that chemically bonds to both the silica particles and the polymer matrix. This coupling agent forms a bridge between the inorganic silica particles and the organic polymer, creating strong interfacial adhesion and preventing particle detachment during application and drying processes.
Solution Approach 2:
The patent creates a composite structure where silica particles, polymer matrix, and silane coupling agent form a integrated system. The silane coupling agent modifies the surface of silica particles to be compatible with the polymer, forming a tri-phase composite that combines the hardness and hydrophilicity of silica with the binding properties of the polymer through chemical bonding.
2Ease of operation
If a small amount of inorganic dispersant is used to obtain resin particles with hydrophilic surfaces, then the particles can be dispersed in aqueous media, but the inorganic dispersant does not strongly adhere to the resin particle surfaces
Solution Approach 1:
The patent changes the chemical parameters of the inorganic dispersant surface by treating it with silane coupling agents. This surface modification alters the chemical composition and surface energy of the silica particles, enabling strong chemical bonding to the polymer matrix while maintaining hydrophilicity and aqueous dispersibility.
Solution Approach 2:
The silane coupling agent acts as a chemical intermediary that connects the inorganic dispersant (silica) to the organic polymer matrix. This intermediary substance provides both inorganic and organic functional groups that can bond to respective materials, ensuring strong adhesion while preserving the dispersant's hydrophilic 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 method ensures strong adhesion of silica particles to polymer particles, improving scratch resistance and dispersibility in aqueous media, and maintaining stability in coating films and external preparations.
Implementation Method 1
a water-soluble cellulose compound adsorbing onto surfaces of the silica particles
Implementation Method 2
a polymerization step of subjecting a polymerizable monomer to aqueous suspension polymerization
Data Source
AI summary
In a method for producing composite particles containing polymer particles and silica particles that adhere to the polymer particles, the composite particles are obtained by subjecting a polymerizable monomer to aqueous suspension polymerization in a presence of silica particles and a cellulose compound adsorbing onto the silica particles. The composite particles contain the polymer particles, the silica particles that adhere to surfaces of the polymer particles, and the water-soluble cellulose compound.