Laminating Adhesive With Phosphoric Acid Promoter
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Solution Overview
Problem
Existing urethane adhesive systems lack an effective adhesion promoter to enhance bond strength, especially in the presence of moisture, and existing solutions like polyester-polyphosphoric acid copolymers require complex multi-step preparations and are not used in urethane adhesive systems.
Innovation Solution
A two-component bonding agent composition comprising an isocyanate-terminated prepolymer, a polyol component with triglycerides, and an adhesion promoter that includes phosphoric acid and hydroxy-terminated polyester, which is added to either the isocyanate or polyol component to improve adhesion, with specific weight percentages and molecular weight ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If an adhesion promoter is added to improve bond strength in the presence of moisture, then bond strength is improved, but the complexity of the adhesive system increases
Solution Approach 1:
The patent introduces phosphoric acid and hydroxy-terminated polyester as intermediary substances (adhesion promoters) that mediate between the urethane adhesive and the substrate surface. These promoters chemically interact with both the adhesive components and the substrate, creating enhanced bonding interfaces that improve bond strength particularly in moist environments without requiring fundamental changes to the base adhesive system.
Solution Approach 2:
The adhesive system becomes a composite by incorporating phosphoric acid and hydroxy-terminated polyester into the urethane adhesive matrix. This creates a multi-component system where each component contributes specific properties: the urethane provides base adhesion, phosphoric acid enhances chemical bonding to substrates, and the polyester modifies the adhesive matrix properties, resulting in a composite material with superior overall performance.
2Reliability
If phosphoric acid and hydroxy-terminated polyester are used as adhesion promoters, then adhesion and moisture resistance are enhanced, but the manufacturing process becomes more complex
Solution Approach 1:
The adhesion promoters (phosphoric acid and hydroxy-terminated polyester) are pre-formulated and prepared in advance as separate components before being integrated into the final adhesive system. This preliminary preparation allows for optimized formulations and simplifies the final manufacturing process, as the promoters are ready-to-use additives rather than substances requiring complex in-process synthesis.
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 provides improved bond strength and durability, maintaining performance even after exposure to water, suitable for laminating various substrates including plastic and metal films, with enhanced adhesion and resistance to moisture.
Implementation Method 1
Laminating adhesive... improve bond strength... adhesion promoter
Data Source
AI summary
A two-component bonding agent composition. The composition contains: (a) an isocyanate component comprising a difunctional isocyanate-terminated prepolymer having polymerized residues of at least one difunctional aromatic isocyanate and at least one difunctional polymer of ethylene oxide, propylene oxide or a combination thereof; (b) a polyol component comprising a triglyceride having hydroxyl functional groups; and (c) an adhesion promoter.