One-Part Water-Based Adhesive Silane Crosslinking
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Solution Overview
Problem
Existing water-based adhesive compositions face challenges such as complexity in industrial production, mixing failures, and environmental concerns due to the need for special equipment and two-part compositions, while also suffering from yellowing, lack of adhesiveness, and durability.
Innovation Solution
A one-part water-based adhesive composition is developed, comprising an aqueous dispersion of polyurethane resin and a silane compound obtained by reacting an epoxysilane with an aminosilane, within specific molar ratios and temperature ranges, eliminating the need for organic solvents and phthalic acid-based plasticizers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a two-part adhesive composition is used to improve water resistance and durability, then adhesiveness and durability are improved, but mixing failure occurs and operation becomes complicated
Solution Approach 1:
The patent combines the main agent and curing agent into a single one-part water-based adhesive composition. The silane-modified polyurethane resin contains both the adhesive components and the silane coupling agent that acts as the curing mechanism, eliminating the need for separate mixing operations while maintaining water resistance and durability through the silane cross-linking reaction that occurs upon contact with moisture.
2Strength
If solvent-type adhesive agents are used to achieve good adhesiveness, then adhesiveness is improved, but environmental concerns and occupational safety issues arise
Solution Approach 1:
The patent changes the solvent parameter from organic solvents to water as the continuous phase. The adhesive uses a water-based system where the polyurethane resin and silane compounds are dispersed or dissolved in water, maintaining effective adhesive performance through the resin-silane-adherend interactions while eliminating the harmful effects of volatile organic compounds.
3Object-affected harmful factors
If conventional water-based adhesive compositions are used to reduce environmental impact, then environmental safety is improved, but yellowing occurs and adhesiveness deteriorates
Solution Approach 1:
The patent creates a composite system combining polyurethane resin with silane coupling agents. The silane modification introduces cross-linking capability to the polyurethane matrix, forming a more stable and durable adhesive film that resists yellowing and maintains adhesiveness. The composite structure of silane-grafted polyurethane chains provides both the environmental benefits of water-based formulation and the performance characteristics of cross-linked polymers.
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 adhesiveness, durability, and environmental safety by preventing yellowing, simplifying industrial production, and offering wide-ranging applications without mixing failures or environmental concerns.
Implementation Method 1
a silane compound obtained by reacting an epoxysilane compound with an aminosilane compound
Implementation Method 2
an aqueous dispersion of a polyurethane resin
Data Source
AI summary
Provided is a one-part water-based adhesive composition which suffers no yellowing and is excellent in adhesiveness and durability. The one-part water-based adhesive composition includes (A) an aqueous dispersion of a polyurethane resin and (B) a silane compound obtained by reacting a specific epoxysilane compound with an aminosilane compound represented by the following Formula (2), the amount of the epoxysilane compound being in the range of 1.5 to 10 mol per 1 mol of the aminosilane compound, at a reaction temperature of 40 to 100° C.(In Formula (2), R7 to R12 are each a hydrogen atom or an alkyl group, R13 is a monovalent hydrocarbon group, R14 is an alkyl group, and b is 0 or 1.)