Laminate Adhesive Rapid Curing via Polyisocyanate Derivatives
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Solution Overview
Problem
The production of laminate films is hindered by the need for laminate adhesives that require aging for 4 days or more, leading to longer production times.
Innovation Solution
A laminate adhesive comprising a polyisocyanate component and a polyol component, where the polyol component includes polyurethane polyol derived from a reaction with a polyisocyanate derivative having an average functional group of more than 2, specifically araliphatic or alicyclic diisocyanate derivatives.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional two-component curable polyurethane adhesive is used, then adhesive strength can be achieved, but aging time of 4 days or more is required leading to long production time
Solution Approach 1:
The invention changes the chemical parameters of the adhesive system by using specific polyisocyanate derivatives (araliphatic or alicyclic diisocyanate derivatives with average functional group of more than 2) and controlling the NCO/OH ratio to achieve rapid curing within 1-3 days while maintaining adhesive strength, thereby reducing the aging time from 4 days to 1-3 days
Solution Approach 2:
The invention creates a composite adhesive system combining polyisocyanate component and polyol component with specific molecular structures and functional group ratios, where the polyisocyanate derivative has an average functional group of more than 2, creating a crosslinked network structure that achieves both rapid curing and strong adhesion
2Productivity
If aging time is reduced for faster production, then productivity improves, but delamination during heating may occur reducing reliability
Solution Approach 1:
The invention optimizes the NCO/OH ratio to 0.8-1.2 and uses polyisocyanate derivatives with average functional group of more than 2 to achieve rapid crosslinking that forms a heat-resistant network structure, allowing the adhesive to reach sufficient curing in 1-3 days while maintaining delamination resistance during heating
Solution Approach 2:
The invention uses a short-lived intermediate state (partially cured adhesive) that rapidly transitions to a stable final state, where the initial rapid curing provides temporary protection against delamination during the shortened aging period, and the final crosslinked structure provides long-term heat resistance
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
This adhesive suppresses delamination during heating even with short aging times, maintaining excellent adhesive strength and heat seal properties.
Implementation Method 1
polyurethane polyol of a reaction product of polyol and a polyisocyanate derivative with an average functional group of more than 2
Data Source
AI summary
The laminate adhesive contains a polyisocyanate component and a polyol component. The polyol component contains polyurethane polyol of a reaction product of polyol and a polyisocyanate derivative with an average functional group of more than 2. The polyisocyanate derivative is an araliphatic diisocyanate derivative and/or alicyclic diisocyanate derivative.