Curable Resin Composition with Core-Shell Particles
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Solution Overview
Problem
Current curable resin compositions containing polyurethane struggle to balance high rigidity and adhesiveness, often compromising on either toughness or elastic modulus.
Innovation Solution
Incorporating polymer fine particles into a curable resin composition comprising a polyol and a polyisocyanate, with specific ratios and types of polyols and polyisocyanates, to enhance the cured material's rigidity, toughness, and adhesiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If polyurethane is used as the main component in curable resin composition, then adhesiveness is improved, but rigidity (elastic modulus) deteriorates
Solution Approach 1:
The patent uses a composite system combining polyurethane resin with specific rubber polymers (polybutadiene, polyisoprene, or polyisobutylene) to create a multi-phase material that simultaneously achieves high adhesiveness from the polyurethane and high rigidity from the rubber polymer network, resolving the contradiction between these two properties
Solution Approach 2:
The patent changes the chemical composition parameters by incorporating rubber polymers with specific glass transition temperatures and molecular structures into the polyurethane system, adjusting the material parameters to achieve both high adhesiveness and high rigidity that cannot be obtained with polyurethane alone
2Strength
If polyurethane is used as the main component in curable resin composition, then adhesiveness is improved, but toughness deteriorates
Solution Approach 1:
The patent creates a composite material system where rubber polymers (polybutadiene, polyisoprene, or polyisobutylene) are incorporated into the polyurethane resin to form a multi-phase structure that provides both adhesiveness from the polyurethane matrix and toughness from the rubber polymer domains
Solution Approach 2:
The patent applies local quality by having rubber polymer particles or domains distributed within the polyurethane matrix, where each phase contributes its specific properties: the polyurethane provides adhesiveness while the rubber polymer regions provide toughness and energy absorption
3Stress or pressure
If high elastic modulus is achieved in fiber reinforced composite material, then rigidity is improved, but toughness deteriorates
Solution Approach 1:
The patent uses a multi-level composite approach combining fiber reinforcement with a polyurethane-rubber polymer matrix system, where the fiber provides high elastic modulus and the rubber-modified polyurethane matrix provides toughness, achieving both high rigidity and toughness simultaneously
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 achieves high elastic modulus, toughness, and adhesiveness in the cured material without compromising on any of these properties, making it suitable for structural adhesives and fiber-reinforced composite materials.
Implementation Method 1
a curable resin composition comprising a polyol (A) having an average hydroxyl value of 200 to 1500 mg KOH/g and a polyisocyanate (B)
Implementation Method 2
the curable resin composition comprises a polyol (A), a polyisocyanate (B), and polymer fine particles (C)
Data Source
AI summary
The present invention relates to a curable resin composition comprising a polyol (A), a polyisocyanate (B), and polymer fine particles (C), wherein the polyol (A) comprises a polyester polyol (a2) as an essential component, and the amount of the polyester polyol (a2) is not less than 20 parts by mass per 100 parts by mass of the polyol(A), wherein the polymer fine particles (C) have a core-shell structure and the polymer fine particles (C) have one or more core layers selected from the group consisting of a diene rubber, a (meth)acrylate rubber, and an organosiloxane rubber, and wherein the polymer fine particles (C) have a shell layer graft-polymerized on the core layer, and the shell layer is polymerized with one or more monomers selected from the group consisting of an aromatic vinyl monomer, a vinyl cyanide monomer, and a (meth)acrylate monomer.