Polyurethane Dispersion for Adhesion and Gas Barrier Balance
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Solution Overview
Problem
Current anchor coat agents for gas barrier films lack a balance between adhesion and gas barrier properties, failing to effectively improve both adhesion and gas barrier performance simultaneously.
Innovation Solution
A polyurethane dispersion is developed by reacting isocyanate group-terminated urethane prepolymers with chain extenders, combining adhesive and gas-barrier prepolymers to create a resin with balanced adhesion and gas barrier properties, suitable for use as an anchor coat agent in laminating and bonding inorganic deposited films to thermoplastic resin films.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a conventional anchor coat agent is used to improve adhesion, then adhesion between base film and deposited film is improved, but gas barrier properties are insufficient
Solution Approach 1:
The invention uses a composite polyurethane dispersion containing both adhesive resin (with high-molecular-weight polyol) and gas-barrier resin (with low-molecular-weight polyol) in specific ratios. This composite structure allows the coating to simultaneously provide adhesion promotion and gas barrier properties, resolving the contradiction between these two functions that existed in conventional single-component anchor coat agents.
Solution Approach 2:
The invention assigns different functional qualities to different components within the polyurethane dispersion: the adhesive resin component (containing high-molecular-weight polyol) provides adhesion properties, while the gas-barrier resin component (containing low-molecular-weight polyol) provides gas barrier properties. This local differentiation of functional qualities within a single coating system allows both requirements to be satisfied simultaneously.
2Strength
If adhesive resin with high-molecular-weight polyol is used, then adhesion is improved, but gas barrier properties deteriorate
Solution Approach 1:
The invention merges two previously conflicting resin systems (adhesive resin with high-molecular-weight polyol and gas-barrier resin with low-molecular-weight polyol) into a single polyurethane dispersion coating. By combining both components in appropriate ratios, the coating achieves both adhesion and gas barrier properties that neither component could provide alone, eliminating the need to choose one over the other.
Solution Approach 2:
The invention changes the molecular weight parameter of the polyol component by incorporating both high-molecular-weight and low-molecular-weight polyols in specific proportions. This parameter manipulation allows the coating to exhibit dual functionality: the high-molecular-weight polyol contributes to adhesion while the low-molecular-weight polyol contributes to gas barrier properties, thus resolving the contradiction through controlled parameter variation.
3Object-affected harmful factors
If gas-barrier resin with low-molecular-weight polyol is used, then gas barrier properties are improved, but adhesion deteriorates
Solution Approach 1:
The invention combines gas-barrier resin (with low-molecular-weight polyol) and adhesive resin (with high-molecular-weight polyol) into a unified polyurethane dispersion system. This merging allows the coating to inherit gas barrier properties from the low-molecular-weight component while simultaneously gaining adhesion properties from the high-molecular-weight component, eliminating the trade-off between these properties.
Solution Approach 2:
The invention manipulates the molecular weight parameter of the polyol by using a blend of high-molecular-weight and low-molecular-weight polyols in controlled ratios. This parameter control enables the coating to achieve both gas barrier properties (from low-molecular-weight polyol) and adhesion properties (from high-molecular-weight polyol), resolving the contradiction through deliberate parameter adjustment.
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 polyurethane dispersion achieves both strong adhesion and effective gas barrier properties, enhancing the performance of gas barrier laminated films by ensuring reliable bonding and barrier integrity.
Implementation Method 1
aqueous polyurethane resin obtained by reaction of an isocyanate group-terminated urethane prepolymer with a chain extender
Implementation Method 2
obtained by aqueously dispersing an aqueous polyurethane resin
Data Source
AI summary
A polyurethane dispersion is obtained by aqueously dispersing an aqueous polyurethane resin obtained by reaction of an isocyanate group-terminated urethane prepolymer with a chain extender. The isocyanate group-terminated urethane prepolymer contains an adhesive urethane prepolymer for imparting adhesion and a gas-barrier urethane prepolymer for imparting gas barrier properties.