Solvent-Based Adhesive Composition for Chemical Aging Resistance
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Solution Overview
Problem
Solvent-based laminates exhibit poor adhesion after chemical aging and high temperature testing, leading to defects such as bubbling and delamination, making them unsuitable for applications like food packaging and deep-drawn cans that require sustained adhesion.
Innovation Solution
A two-component solvent-based adhesive composition is developed, comprising a reaction product of an isocyanate component, a polyol component containing a polyester-polycarbonate polyol and a phosphate-terminated polyol, and a solvent, which is formed by reacting these components to enhance adhesion under heat and chemical exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If solvent-based adhesives are used for laminate formation, then ease of application and initial adhesion are improved, but adhesion strength deteriorates after chemical aging and high temperature exposure
Solution Approach 1:
The patent modifies the chemical composition parameters of the adhesive by incorporating specific polyesters with controlled molecular weights, hydroxyl numbers, and acid numbers. These parameter changes enable the adhesive to maintain both ease of application and reliability after chemical aging and heat exposure
Solution Approach 2:
The invention creates a composite adhesive system combining solvent-based formulation with specific polyester modifiers and controlled molecular weight distributions. This composite approach allows the adhesive to exhibit both good application properties and enhanced durability after environmental stress
2Ease of manufacture
If conventional solvent-based adhesives are used, then manufacturing simplicity is maintained, but laminate quality deteriorates due to bubbling and delamination defects
Solution Approach 1:
The patent specifies precise parameter ranges for polyester molecular weight (500-5000 g/mol), hydroxyl number (50-200 mg KOH/g), and acid number (0.1-2.0 mg KOH/g). These controlled parameters prevent defects like bubbling and delamination while maintaining straightforward manufacturing processes
Solution Approach 2:
The invention introduces specific functional components (polyesters with particular molecular weights and hydroxyl numbers) at controlled concentrations (0.1-10% and 1-20% by weight) to locally enhance adhesion properties without compromising overall manufacturing simplicity
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 adhesive composition maintains strong adhesion after chemical aging and boil-in-bag testing, preventing defects like bubbling and delamination, and is suitable for demanding applications like food packaging and deep-drawn cans.
Implementation Method 1
The two-component solvent-based adhesive composition contains the reaction product of (A) an isocyanate component; (B) a polyol component containing (i) a polyester-polycarbonate polyol and (ii) a phosphate-terminated polyol
Data Source
AI summary
The present disclosure provides a two-component solvent-based adhesive composition. The two-component solvent-based adhesive composition contains the reaction product of (A) an isocyanate component; (B) a polyol component containing (i) a polyester-polycarbonate polyol and (ii) a phosphate-terminated polyol; and (iii) a solvent. The present disclosure also provides a method of forming a two-component solvent-based adhesive composition.