Acrylic-Urethane Adhesive Composition for Heat-Resistant Lamination
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Solution Overview
Problem
Existing water-based acrylic latex systems used as laminating adhesives lack performance characteristics for a broader range of substrates, including plastic films and metal foils, and there is a need for improved heat, moisture, and chemical resistance.
Innovation Solution
A two-component aqueous adhesive composition comprising a first component with a copolymer of styrene, hydrophobic acrylic monomers, and limited hydroxy functional monomers, blended with a water dispersible polyol, and a second component of water dispersible polyisocyanate, forming a hybrid system with a 1:1 to 8:1 NCO/NCO-reactive group molar ratio for enhanced crosslinking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If water-based acrylic latex systems are used as laminating adhesives, then ease of handling and reduced chemical solvent emissions are improved, but performance characteristics for broader substrates and heat/moisture resistance deteriorate
Solution Approach 1:
The patent creates a hybrid adhesive system combining acrylic latex polymer with polyol and polyisocyanate components. This composite formulation integrates the water-based ease of handling of acrylic latex with the crosslinked urethane network's heat and moisture resistance, resolving the contradiction between operational ease and environmental resistance
Solution Approach 2:
The patent modifies the chemical composition parameters by incorporating polyol (0.1-10% of solid content) and polyisocyanate (1:1 to 8:1 NCO/NCO-reactive group molar ratio) into the acrylic latex system. These parameter changes enable crosslinking that enhances heat and moisture resistance while maintaining water-based handling characteristics
2Object-generated harmful factors
If water-based acrylic latex systems are used as laminating adhesives, then reduced chemical solvent emissions are achieved, but adhesion performance on plastic films and metal foils deteriorates
Solution Approach 1:
The hybrid adhesive combines acrylic latex with polyol-polyisocyanate crosslinking system to create a composite material that maintains water-based low emissions while gaining enhanced adhesion to diverse substrates including plastic films and metal foils through the crosslinked network structure
Solution Approach 2:
The patent adjusts compositional parameters by incorporating specific amounts of polyol (0.1-10% of solid content) and controlling polyisocyanate ratio (1:1 to 8:1 NCO/NCO-reactive group molar ratio) to optimize adhesion performance across different substrate types while maintaining water-based formulation benefits
3Reliability
If crosslinking is performed with water-dispersible polyisocyanate, then heat and moisture resistance is improved, but device complexity and formulation difficulty increase
Solution Approach 1:
The patent establishes specific parameter ranges for polyol content (0.1-10% of solid content) and polyisocyanate ratio (1:1 to 8:1 NCO/NCO-reactive group molar ratio) to optimize crosslinking performance while maintaining manageable formulation complexity and ease of use
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 exhibits excellent heat, chemical, and environmental resistance, with a long pot life and ease of handling, achieving strong adhesion over a wide temperature and humidity range, comparable to solvent-based systems.
Implementation Method 1
The polyol in the latex preferably cures with the polyisocyanate to form a hybrid system of an acrylic copolymer and a urethane
Data Source
AI summary
A two-component bonding agent composition of an aqueous component having a polyol and an acrylic-styrene polymer, and an isocyanate component having a water dispersible polyisocyanate.