Core-shell polymer particles in epoxy resin for impact peel resistance
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Solution Overview
Problem
Cured epoxy resin products exhibit fragile properties with low fracture toughness, limiting their application due to inadequate impact peel-resistant adhesion, particularly in structural adhesives where improved resistance to dynamic peeling is required.
Innovation Solution
A curable resin composition combining epoxy resin with core-shell structured polymer fine particles containing diene rubber in the core layer and a hydroxyl group in the shell layer, along with blocked urethane as a strengthening agent, to enhance impact peel-resistant adhesion while maintaining low viscosity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If epoxy resin is used as the main component, then excellent mechanical strength and electrical insulation are achieved, but fracture toughness is low and impact peel-resistant adhesion is insufficient
Solution Approach 1:
The patent combines epoxy resin with core-shell structured polymer fine particles where the core contains diene rubber and the shell contains hydroxyl groups. This composite structure allows the epoxy resin to provide mechanical strength while the rubber core absorbs impact energy, improving fracture toughness and impact peel-resistant adhesion.
2Reliability
If polymer fine particles with hydroxyl group in shell layer are combined with blocked urethane, then impact peel-resistant adhesion is improved, but viscosity of the curable resin composition increases
Solution Approach 1:
The patent optimizes the hydroxyl group content in the shell layer to 0.01 to 0.8 mmol/g and controls the ratio of polymer fine particles to blocked urethane within 0.05 to 5 by mass. These parameter adjustments ensure sufficient chemical bonding for improved adhesion while preventing excessive viscosity increase that would hinder processing.
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 composition significantly improves impact peel-resistant adhesion of the cured product, preventing viscosity increase and ensuring excellent adhesion properties, making it suitable for structural applications.
Implementation Method 1
the shell layer contains at least a hydroxyl group, and the content of the hydroxyl group of the polymer fine particles (B) is 0.01 to 0.8 mmol/g
Implementation Method 2
a chemical bond of a functional group (hydroxyl group) of the shell layer of the core-shell polymer fine particles and a strengthening agent (blocked urethane) is utilized
Data Source
AI summary
The present invention relates to a curable resin composition containing 100 parts by mass of an epoxy resin (A), 1 to 100 parts by mass of polymer fine particles (B), and 1 to 100 parts by mass of a blocked urethane (C), wherein the polymer fine particles have a core-shell structure of a core layer and a shell layer, the core layer contains diene rubber, the shell layer contains at least a hydroxyl group, and the content of the hydroxyl group of the polymer fine particles (B) is 0.01 to 0.8 mmol/g.