One-Part Moisture-Curable Urethane Adhesion to Coated Plates
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Solution Overview
Problem
Conventional one-part moisture-curable polyurethane compositions often exhibit poor adhesion to adherends, limiting their effectiveness in sealing and adhesive applications.
Innovation Solution
A one-part moisture-curable polyurethane composition is developed by mixing a urethane prepolymer, an aliphatic isocyanate, an aminosilane compound, and a catalyst, specifically using polypropylene glycol with diphenylmethane diisocyanate, aliphatic isocyanate-modified products, and an aminosilane with an alkoxysilyl group and nitrogen atom, along with organotin catalysts and dimorpholinodiethyl ether, to enhance adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional one-part moisture-curable polyurethane compositions are used, then ease of handling is improved, but adhesion to adherend deteriorates
Solution Approach 1:
The patent combines multiple components (polyol, polyisocyanate, silane compound, amino compound) into a composite one-part composition that achieves both ease of handling and excellent adhesion. The composite nature allows synergistic effects where the interaction between components provides both the desired handling properties and superior bonding to adherends, resolving the contradiction between convenience and performance.
Solution Approach 2:
The patent optimizes specific parameters including the NCO:OH ratio (1.05-2.0), silane compound content (0.1-5 parts by mass per 100 parts polyol), and amino compound content (0.1-5 parts by mass per 100 parts polyol) to achieve the optimal balance between ease of handling and adhesion strength. By precisely controlling these compositional parameters, the invention resolves the contradiction between the two opposing requirements.
2Ease of manufacture
If conventional one-part moisture-curable polyurethane compositions are used, then simplicity of application is improved, but adhesion performance deteriorates
Solution Approach 1:
The patent incorporates silane compounds and amino compounds into the one-part composition in advance, so that when the composition is applied, the adhesion-promoting components are already present and ready to react with the adherend surface. This preliminary incorporation eliminates the need for separate adhesion promotion steps while ensuring reliable adhesion performance, thus resolving the contradiction between application simplicity and adhesion reliability.
Solution Approach 2:
The silane compounds and amino compounds act as intermediary substances that mediate between the polyurethane matrix and the adherend surface. These intermediaries provide chemical bonding sites that enhance adhesion without complicating the application process, as they are already integrated into the composition. This resolves the contradiction by providing a mechanical-chemical bridge that improves reliability while maintaining 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 composition achieves excellent adhesion to coated plates, demonstrating improved adhesion strength, storage stability, and curability, even at low temperatures and in high-humidity conditions, without the need for a primer.
Implementation Method 1
one-part moisture-curable urethane composition, which cures by moisture in the air
Implementation Method 2
a silane compound containing an average of at least 1.5 NCO groups and an average of at least 1.5 hydrolyzable alkoxy groups in each molecule
Implementation Method 3
a catalyst
Implementation Method 4
a preliminary composition obtained by mixing a urethane prepolymer, an aliphatic isocyanate A, and an aminosilane compound B
Implementation Method 5
the catalyst contains at least one type selected from the group consisting of products formed by reacting 1,3-diacetoxy-1,1,3,3-tetrabutyl-distannoxane with ethyl silicate
Data Source
AI summary
The present technology is to provide a one-part moisture-curable polyurethane composition having excellent adhesion to an adherend (coated plate), and a method for producing such a composition. The present technology is a one-part moisture-curable urethane composition including a preliminary composition obtained by mixing a urethane prepolymer, an aliphatic isocyanate A, and an aminosilane compound B, and a catalyst; and a method for producing such a composition.