Curable Resin Composition Storage Stability and Curing Speed
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Solution Overview
Problem
Current curable resin compositions used in automotive applications face challenges with storage stability, low-temperature curability, and shear strength, particularly when used with resin materials or glass in moist environments or low-temperature conditions.
Innovation Solution
A curable resin composition comprising a urethane prepolymer with an isocyanate group, a coated amine with a solid amine having a melting point of 50°C or higher, and an isocyanate group-containing compound bonded to an aliphatic hydrocarbon group and hydrolyzable or (meth)acryloyl groups, along with a tertiary amine, which enhances storage stability and adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a one-component composition is used, then storage stability is improved, but curing speed deteriorates (curing is slow)
Solution Approach 1:
The composition is segmented into multiple functional components: (A) polyisocyanate compound or active terminal isocyanate group-containing urethane prepolymer, (B) fine powder coating amine with surface-fixed powder, (C) isocyanate group-containing compound with hydrolyzable silyl groups or (meth)acryloyl groups, and (D) tertiary amine compound. Each component serves a specific function, allowing the system to achieve both storage stability and fast curing through synergistic interaction rather than relying on a single component
2Stability of the object's composition
If a two-component composition is used, then storage stability is improved, but handleability deteriorates
Solution Approach 1:
Multiple amine components (fine powder coating amine and tertiary amine compound) and isocyanate-containing compounds are merged into a single composition formulation. This integration allows the system to maintain storage stability while improving handleability, as the combined components work synergistically to provide both stability during storage and ease of application during use
3Stability of the object's composition
If a composition containing urethane prepolymer and coating amine is used, then storage stability is improved, but curability in moist environment deteriorates (difficult to cure)
Solution Approach 1:
The composition uses a composite approach by combining multiple types of amine compounds (coating amine with filler and tertiary amine) and isocyanate-containing compounds with different functional groups (hydrolyzable silyl groups and (meth)acryloyl groups). This composite formulation ensures reliable curing in moist environments while maintaining storage stability, as the different components complement each other's strengths and compensate for weaknesses
4Stability of the object's composition
If a composition containing urethane prepolymer and coating amine is used, then storage stability is improved, but shear strength after curing deteriorates (poor shear strength)
Solution Approach 1:
The invention changes key parameters of the composition by introducing isocyanate group-containing compounds with hydrolyzable silyl groups or (meth)acryloyl groups, and combining multiple amine types. These parameter changes in chemical composition and structure result in improved shear strength after curing while maintaining storage stability, as the modified components create stronger crosslinked networks and better adhesion
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 exhibits excellent storage stability, easy curing by moisture or low-temperature heating, and high shear strength after curing, addressing the limitations of existing compositions.
Implementation Method 1
an isocyanate group-containing compound having an isocyanate group bonded to an aliphatic hydrocarbon group and at least one type selected from the group consisting of hydrolyzable silyl groups and (meth)acryloyl groups
Implementation Method 2
a coated amine in which a solid amine having a melting point of 50° C. or higher is coated with a filler
Implementation Method 3
a tertiary amine compound
Data Source
AI summary
The present technology provides a curable resin composition that contains a urethane prepolymer having an isocyanate group, a coated amine formed by using a filler to coat solid amine having a melting point of 50° C. or higher, an isocyanate group-containing compound having an isocyanate group bonded to an aliphatic hydrocarbon group and having a hydrolyzable silyl group or (meth)acryloyl group, and a tertiary amine compound.