Aromatic Aliphatic Isocyanate Adhesive Composition
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Solution Overview
Problem
Current adhesives with isocyanate functional components face challenges in achieving rapid cure rates while maintaining sufficient green strength and longer tack free times, which limits their productivity and handling capabilities in industrial applications.
Innovation Solution
A composition comprising a combination of aromatic and aliphatic isocyanate functional components, along with fillers like clays and catalysts, is developed to optimize the ratio of isocyanate groups to reactive groups, enhancing cure speed and final strength, and incorporating low molecular weight compounds and polyoxyalkylene polyamines to improve adhesive properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If isocyanate functional components are used to achieve rapid cure rates, then productivity is improved, but green strength and tack free time are insufficient
Solution Approach 1:
The patent applies parameter changes by carefully controlling the ratio of aromatic isocyanate groups to isocyanate reactive groups (0.95-1.05) and total isocyanate groups to isocyanate reactive groups (1.10-1.30). This precise parameter optimization enables rapid cure rates while maintaining adequate green strength and tack free time, resolving the contradiction between productivity and strength development.
2Productivity
If isocyanate functional components are used to achieve rapid cure rates, then productivity is improved, but tack free time is reduced
Solution Approach 1:
The patent utilizes parameter changes by optimizing the ratio of aromatic isocyanate groups to isocyanate reactive groups within 0.95-1.05 and total isocyanate groups to isocyanate reactive groups within 1.10-1.30. This controlled parameter range achieves rapid cure rates while preserving sufficient tack free time for substrate handling, thereby resolving the contradiction between productivity and handling time.
3Productivity
If aromatic isocyanate functional groups are used to enhance cure speed, then productivity is improved, but adhesion to substrates may be compromised
Solution Approach 1:
The patent applies composite materials by combining aromatic isocyanate functional groups (for rapid cure) with aliphatic isocyanate functional groups (for adhesion). This composite approach creates a balanced adhesive system that achieves both rapid cure speed and reliable substrate adhesion, resolving the contradiction between productivity and reliability.
Solution Approach 2:
The patent uses parameter changes by controlling the ratio of aromatic isocyanate groups to isocyanate reactive groups (0.95-1.05) and total isocyanate groups to isocyanate reactive groups (1.10-1.30). This precise parameter control ensures that aromatic groups provide rapid cure while aliphatic groups maintain adhesion, resolving the contradiction between cure speed and adhesion reliability.
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 solution enables rapid cure rates with extended tack free times, providing strong bonding capabilities and improved handling characteristics, suitable for various substrates including glass and plastics, while maintaining cohesive and adhesive strengths over time.
Implementation Method 1
one or more catalysts which catalyze the reaction of isocyanate functional groups with isocyanate reactive groups
Data Source
Figure 1~2
AI summary
A composition comprising in Part 1 : a) one or more isocyanate functional components having aromatic isocyanate functional groups; and b) one or more isocyanate functional components having aliphatic isocyanate functional groups; and in Part 2 c) one or more compounds having more than one isocyanate reactive groups: wherein the ratio of aromatic isocyanate functional groups to isocyanate reactive groups is from 0.95 to 1.05 and the ratio of aromatic isocyanate functional groups and aliphatic isocyanate functional groups (total isocyanate groups) to isocyanate reactive groups is from 1.10 to 1.30.