Urethane Adhesive Composition Heat-Resistant Resin Bonding
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Solution Overview
Problem
The existing urethane adhesive compositions fail to provide sufficient heat-resistant adhesion to resin materials after storage, which is crucial for safety and performance in automotive applications.
Innovation Solution
A urethane adhesive composition incorporating a vinyl silane coupling agent, a urethane prepolymer with an isocyanate group, an isocyanurate compound with an isocyanurate ring, and a terpene compound with active hydrogen, specifically formulated to enhance adhesion to olefin resin materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional urethane adhesive composition is used, then the adhesive can bond to resin materials, but the heat-resistant adhesion after storage is insufficient
Solution Approach 1:
The patent changes the chemical parameters of the adhesive composition by introducing a specific vinyl silane coupling agent with a defined molecular structure (Formula A) containing specific hydrocarbon groups and vinyl moieties. This parameter change in chemical composition enables the adhesive to achieve both strong initial adhesion and maintained heat-resistant adhesion after storage, resolving the contradiction between reliability and strength.
Solution Approach 2:
The patent creates a composite adhesive system combining urethane prepolymer, isocyanurate compound, terpene compound, and vinyl silane coupling agent. This composite material approach allows the adhesive to simultaneously achieve good adhesion strength and heat-resistant performance after storage, as each component contributes specific properties that work synergistically.
2Strength
If the adhesive composition is formulated for strong initial adhesion, then bonding strength is improved, but heat-resistant adhesion after storage deteriorates
Solution Approach 1:
The vinyl silane coupling agent performs preliminary chemical bonding to the resin surface before the main urethane adhesive cures. This preliminary action creates a stable interface that maintains adhesion strength over time and under heat conditions, preventing the deterioration that would otherwise occur during storage and service.
Solution Approach 2:
The vinyl silane coupling agent acts as an intermediary between the urethane adhesive and the resin substrate. It forms a chemical bridge that maintains strong adhesion both initially and after storage, preventing the strength-durability contradiction by mediating the bond between the adhesive and resin throughout the service life.
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 heat-resistant adhesion after storage, improving the bonding strength and durability of the adhesive to resin materials, even under low wetting conditions.
Implementation Method 1
a vinyl silane coupling agent represented by Formula (A) below: (where in Formula (A), R1 and R3 each independently represent a monovalent hydrocarbon group, R2 represents a (n+1) valent hydrocarbon group, Vi represents —CH═CH2, m1 is from 1 to 3, m2 is from 1 to 3, m3 is from 0 to 2, m1+m2+m3 is 4, and n is 1 or greater)
Implementation Method 2
a urethane prepolymer having an isocyanate group; a terpene compound having active hydrogen
Implementation Method 3
a vinyl silane coupling agent represented by Formula (A) below... excellent heat-resistant adhesion after storage... even under low wetting conditions
Data Source
AI summary
The present invention is to provide a urethane adhesive composition which exhibits excellent heat-resistant adhesion after storage to resin. The present invention relates to a urethane adhesive composition including: a urethane prepolymer having an isocyanate group; an isocyanurate compound having an isocyanurate ring; a terpene compound having active hydrogen; and a vinyl silane coupling agent represented by Formula (A) below: (where in Formula (A), R1 and R3 each independently represent a monovalent hydrocarbon group, R2 represents a (n+1) valent hydrocarbon group, Vi represents —CH═CH2, m1 is from 1 to 3, m2 is from 1 to 3, m3 is from 0 to 2, m1+m2+m3 is 4, and n is 1 or greater).