Two-Component Polyurethane Adhesive with Epoxy Silane Metal Bonding
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Solution Overview
Problem
Traditional two-component solventless polyurethane-based laminating adhesives exhibit high initial viscosity, weak initial bonds, slow bond development, poor chemical resistance, especially in acidic conditions, and poor adhesion strength to metal or metal alloy substrates, with existing additives failing to provide satisfactory performance improvements.
Innovation Solution
A solventless polyurethane adhesive composition incorporating a polyether amine-epoxy silane adduct, along with phosphate ester polyol and/or epoxy-aromatic diisocyanate adduct, to enhance adhesion strength and chemical resistance, featuring a reaction between isocyanate and isocyanate-reactive components to form a polyurethane main chain with covalently attached residual moieties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If traditional two-component solventless polyurethane-based laminating adhesives are used, then the adhesive composition is environmentally friendly and free of organic solvent, but the adhesion strength to metal or metal alloy substrates is poor
Solution Approach 1:
The patent employs a composite adhesive system combining polyether amine-epoxy silane adduct with traditional polyurethane components. The epoxy silane component provides enhanced adhesion to metal substrates through chemical bonding mechanisms, while the polyether amine component maintains the solventless polyurethane matrix. This composite approach allows the adhesive to achieve both environmental friendliness and superior metal adhesion strength.
2Ease of manufacture
If traditional two-component solventless polyurethane-based laminating adhesives are used, then the adhesive composition is simple and easy to manufacture, but the chemical resistance especially in acidic conditions is poor
Solution Approach 1:
The patent modifies the chemical composition parameters by incorporating epoxy silane adduct with specific functional groups that provide acid resistance. The epoxy groups and silane moieties create a crosslinked network structure that resists chemical degradation. This parameter change in composition maintains the two-component system simplicity while dramatically improving chemical resistance to acidic conditions.
3Productivity
If traditional two-component solventless polyurethane-based laminating adhesives are used, then the adhesive can be applied at high line speed, but the initial bond strength is weak and bond development is slow
Solution Approach 1:
The epoxy silane adduct component performs preliminary bonding action upon contact with the metal substrate, forming strong initial adhesion through chemical interaction. This preliminary bonding mechanism allows the adhesive to achieve immediate tack and initial bond strength, enabling high line speed application while eliminating the slow bond development issue characteristic of traditional polyurethane adhesives.
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 improved adhesion strength and chemical resistance to metal or metal alloy substrates, addressing the limitations of traditional adhesives by providing enhanced bond development and stability under various conditions.
Implementation Method 1
a polyurethane main chain to which residual moiety of the polyether amine-epoxy silane adduct is covalently attached
Implementation Method 2
by reacting the isocyanate component (A) with the isocyanate-reactive component (B) and the polyether amine-epoxy silane adduct
Data Source
Figure 1
AI summary
A two-component adhesive composition is provided. The two-component adhesive composition comprises an isocyanate component, an isocyanate-reactive component and an polyether amine-epoxy silane adduct, and can achieve superior adhesion strength between the adhesive and a substrate like metal alloy substrate. A laminated article prepared with said composition, a method for preparing the article and the use of the polyether amine-epoxy silane adduct as adhesion promoter in a two-component polyurethane adhesive composition are also provided.