Polyurethane Composition Catalyst System for Adhesion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing polyurethane compositions used for sealing and adhesion applications face challenges with long-term adhesion against weather resistance and vibration, as they tend to degrade over time.
Innovation Solution
A polyurethane composition comprising a main agent with a urethane prepolymer, a morpholine compound with one morpholine ring, an ether compound with two dimethylamino groups, and a curing agent containing an active hydrogen compound with multiple active hydrogen groups, which enhances adhesion by improving wetting properties and catalytic activity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional polyurethane compositions are used for sealing and adhesion applications, then initial adhesion and sealing performance are achieved, but long-term adhesion against weather resistance and vibration degrades over time
Solution Approach 1:
The patent changes the chemical parameters of the catalyst system by specifying particular tertiary amine-based catalysts with morpholine structure or dimethylamino group structure, and carefully controlling their content (0.01-5 parts by mass per 100 parts by mass of polyol component). It also controls the hydroxyl value of the polyol component (20-200 mg KOH/g) and the isocyanate index (100-200). These parameter changes optimize the curing reaction to improve long-term adhesion while maintaining service life under weather and vibration conditions.
Solution Approach 2:
The patent creates a composite catalyst system combining tertiary amine-based catalysts with specific structures (morpholine or dimethylamino groups) with the polyurethane composition. This composite approach enhances the curing mechanism and results in improved long-term adhesion performance and durability under weather and vibration exposure compared to conventional single-catalyst systems.
2Productivity
If catalyst content is increased to improve curing speed, then curability is enhanced, but storage stability may be compromised
Solution Approach 1:
The patent optimizes the catalyst content parameter within a specific range (0.01-5 parts by mass of tertiary amine-based catalyst per 100 parts by mass of polyol component) and controls the hydroxyl value of the polyol component (20-200 mg KOH/g). This parameter optimization achieves sufficient curing speed while preventing excessive catalyst content from compromising storage stability, resolving the contradiction between productivity and 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 composition demonstrates excellent long-term adhesion against weather resistance and vibration, maintaining stability and effectiveness over time.
Implementation Method 1
a morpholine compound having one morpholine ring, and an ether compound having two dimethylamino groups
Implementation Method 2
a urethane prepolymer having an isocyanate group... and a curing agent including an active hydrogen compound having two or more active hydrogen-containing groups in one molecule
Data Source
AI summary
The present technology provides a polyurethane composition including: a main agent; and a curing agent, wherein the main agent includes a urethane prepolymer having an isocyanate group, a morpholine compound having one morpholine ring, and an ether compound having two dimethylamino groups, and the curing agent includes an active hydrogen compound having two or more active hydrogen-containing groups in one molecule.