Hard Coat Resin Composition with Modified Metal Oxide Microparticles
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Solution Overview
Problem
Conventional resin compositions for hard coats struggle to simultaneously enhance mechanical properties such as scratch resistance and surface hardness while maintaining weather resistance and storage stability, often compromising on one or more of these aspects.
Innovation Solution
An organic-inorganic hybrid resin composition is developed using metal oxide microparticles modified with a polyfunctional (meth)acrylate monomer modifying agent, specifically a silane coupling agent with a thiol group, combined with tri- or more functional (meth)acrylate monomers and bi- or less functional (meth)acrylate monomers, which are reacted to form a resin suitable for hard coats, improving mechanical and weather resistance and storage stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a resin composition is formulated to improve mechanical properties such as scratch resistance and surface hardness, then mechanical strength is enhanced, but weather resistance and storage stability deteriorate
Solution Approach 1:
The patent employs a composite resin composition consisting of multiple resin components (acrylate resin, polyester resin, and polyurethane resin) combined with inorganic microparticles. This composite structure allows the formulation to simultaneously achieve high mechanical properties through the inorganic reinforcement and good weather resistance through the synergistic combination of organic resin components, resolving the contradiction between strength and reliability
Solution Approach 2:
The patent optimizes the compositional parameters by controlling the ratios of different resin components and inorganic microparticles. By adjusting these parameters within specific ranges, the formulation achieves both enhanced mechanical properties and improved weather resistance, transforming the trade-off into a balanced performance through parameter optimization
2Strength
If inorganic microparticles are added to enhance mechanical properties, then scratch resistance improves, but storage stability deteriorates
Solution Approach 1:
The patent introduces a silane coupling agent as an intermediary substance that chemically bonds to both the inorganic microparticles and the organic resin matrix. This coupling agent prevents aggregation of inorganic particles during storage while maintaining their reinforcement effect, thereby improving storage stability without sacrificing scratch resistance
Solution Approach 2:
The patent applies surface treatment to the inorganic microparticles, modifying their surface properties to improve compatibility with the organic resin. This local modification of particle surfaces enhances dispersion stability during storage while preserving the mechanical reinforcement function, resolving the contradiction between strength enhancement and storage 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 resulting resin composition achieves high scratch resistance, surface hardness, and weather resistance, along with stable storage properties, forming a durable hard coat layer that maintains characteristics even after UV curing.
Implementation Method 1
addition reaction between a modifying agent having a thiol group (a mercapto group) and a tri- or more functional (meth)acrylate monomer
Implementation Method 2
maintains characteristics even after UV curing
Data Source
AI summary
A method of preparing a resin composition for hard coat, comprises: a first step of obtaining a polyfunctional (meth)acrylate monomer modifying agent by addition reaction between a modifying agent having a thiol group and a three- or more functional (meth)acrylate monomer to form a covalent bond between the thiol group and acryloyl group and/or methacryloyl group, and a second step of modifying metal oxide microparticles with the polyfunctional (meth)acrylate monomer modifying agent that is obtained from the first step.