Two-Part Urethane Adhesive Primer Elimination via Acrylamide
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Solution Overview
Problem
The use of primers in adhesive applications for resin materials, such as olefin-based resins, often results in environmental concerns due to solvent content and can deteriorate adhesion when curing agents are applied to accelerate curing speed, leading to suboptimal initial and hot water-resistant adhesion.
Innovation Solution
A two-part urethane-based adhesive composition comprising a urethane prepolymer with isocyanate groups and a curing agent containing active hydrogen-containing compounds, including a (meth)acrylamide compound, which eliminates the need for a primer and enhances adhesion without compromising curing speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a primer containing solvent is used for adhesion of resin materials, then adhesion to base materials is improved, but environmental harm increases due to solvent content
Solution Approach 1:
The invention extracts and eliminates the solvent component from the primer system. The adhesive composition is formulated as a solvent-free or low-solvent two-part urethane-based system that achieves adhesion without requiring traditional solvent-based primers, thereby resolving the environmental harm issue while maintaining bonding strength.
Solution Approach 2:
The invention changes the chemical composition parameters of the adhesive system by incorporating specific components (urethane prepolymer, polyol, (meth)acrylamide compound, catalyst) and controlling their ratios. This parameter optimization enables the adhesive to achieve effective adhesion to resin materials without relying on solvent-based primers, thus reducing environmental impact.
2Productivity
If a curing agent is applied to accelerate curing speed, then productivity is improved, but adhesion to base material deteriorates
Solution Approach 1:
The invention optimizes the curing system by selecting specific catalysts (metal chelate compounds or amines) and controlling the curing agent-to-adhesive ratio. This parameter control enables accelerated curing through the curing agent while maintaining adhesion performance by preventing excessive crosslinking density that would compromise bonding to base materials.
Solution Approach 2:
The invention introduces a catalyst as an intermediary substance that mediates between the curing agent and the adhesive components. The catalyst (metal chelate compound or amine) facilitates the curing reaction at controlled rates, enabling speed enhancement without the harsh effects that would deteriorate adhesion, thus acting as a buffer between curing acceleration and bond preservation.
3Object-affected harmful factors
If a primer is used to achieve adhesion without solvent, then environmental harm is reduced, but adhesion performance deteriorates
Solution Approach 1:
The invention creates a composite adhesive system combining multiple components (urethane prepolymer, polyol, (meth)acrylamide compound, catalyst, and optional fillers). This composite formulation achieves adhesion to base materials without requiring traditional primers, eliminating the need for solvent-based intermediate layers while maintaining bonding performance through synergistic component interactions.
Solution Approach 2:
The adhesive composition is designed with multi-functionality, serving both as the primary adhesive and as a primer substitute. The formulation includes components that provide both bonding capability and surface compatibility with resin materials, eliminating the need for separate primer applications and achieving environmental benefits without sacrificing adhesion.
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 two-part urethane-based adhesive composition achieves excellent adhesion to resin base materials, including olefin resins, with improved initial and hot water-resistant properties without the use of a primer, maintaining high shear strength and storage stability.
Implementation Method 1
a main agent containing a urethane prepolymer having an isocyanate group; and a curing agent containing a compound having two or more active hydrogen-containing groups in each molecule
Implementation Method 2
one or both of the main agent and the curing agent containing a (meth)acrylamide compound
Data Source
AI summary
An object of the present invention is to provide a two-part urethane-based adhesive composition that exhibits excellent adhesion to a base material without using a primer. A two-part urethane-based adhesive composition according to the present invention contains: a main agent that contains a urethane prepolymer having an isocyanate group; and a curing agent that contains a compound having two or more active hydrogen-containing groups in each molecule. One or both of the main agent and the curing agent contain a (meth)acrylamide compound.