Two-Component Curable Adhesive Coating Uniformity
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Solution Overview
Problem
Existing two-component curable adhesives face challenges in achieving excellent adhesion force while preventing coating unevenness and residual solvent issues during high-speed coating processes.
Innovation Solution
A two-component curable adhesive is developed, comprising a polyol component with a specific combination of polyether urethane polyol and polyester polyol, and a polyisocyanate component, optimized to achieve excellent adhesion and prevent coating issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a polyester polyol with high affinity for diluent solvent is used as main resin, then adhesion force is improved, but residual solvent increases and appearance deteriorates during high speed coating
Solution Approach 1:
The patent changes the molecular weight parameter of the polyester polyol from conventional high values to specifically 500-3,000, and controls its content at 5-30% by mass based on total polyol. This parameter change reduces the polyester polyol's affinity for diluent solvent while maintaining adhesion force through the polyether urethane polyol, thereby reducing residual solvent and improving appearance during high speed coating.
Solution Approach 2:
The patent creates a composite polyol system combining polyether urethane polyol (70-95% by mass) and polyester polyol (5-30% by mass). This composite material leverages the excellent coating properties of polyether urethane polyol while incorporating the adhesion benefits of polyester polyol in controlled amounts, achieving both good adhesion force and reduced residual solvent.
2Strength
If polyester polyol and polyether urethane polyol are combined, then adhesion force is improved, but coating unevenness occurs due to reduced compatibility between different resin skeletons
Solution Approach 1:
The patent optimizes the molecular weight of polyester polyol to 500-3,000 (number average) and controls its content at 5-30% by mass relative to total polyol. These parameter changes ensure sufficient compatibility between polyester polyol and polyether urethane polyol, preventing coating unevenness while maintaining improved adhesion force.
3Strength
If polyester polyol with high solvent affinity is used, then adhesion force is improved, but coating appearance deteriorates due to poor solvent removability during high speed coating
Solution Approach 1:
The patent reduces the polyester polyol's solvent affinity by limiting its molecular weight to 500-3,000 and controlling its content at 5-30% by mass. This parameter change improves solvent removability during high speed coating, preventing appearance deterioration while maintaining adhesion force through the polyether urethane polyol component.
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 demonstrates excellent adhesion force, prevents coating unevenness, and reduces residual solvent levels during high-speed coating, resulting in a good appearance and reliable performance.
Implementation Method 1
two-component curable adhesive including a polyol component and a polyisocyanate component
Data Source
AI summary
Provided are a two-component curable adhesive that has excellent adhesion force, does not cause coating unevenness in high speed coating, and has a little residual solvent, and a laminate and a package that use the adhesive and have excellent adhesion force and a good appearance. The above problems are solved by a two-component curable adhesive including a polyol component and a polyisocyanate component, in which the polyol component includes a polyether urethane polyol (A) and a polyester polyol (B) having a number average molecular weight of 500 to 3,000, and the content of the polyester polyol (B) is 1.0 to 4.0 parts by mass based on 100 parts by mass of the polyether urethane polyol (A).