Urethane Adhesive Composition for Olefin Resin Bonding
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Solution Overview
Problem
Urethane adhesive compositions applied to olefin resin materials without primer treatment often fail to meet the required adhesion durability standards, affecting the safety and performance of automotive and similar applications.
Innovation Solution
A urethane adhesive composition incorporating a urethane prepolymer with an isocyanate group, an isocyanurate compound of pentamethylene diisocyanate and/or hexamethylene diisocyanate, a secondary aminosilane compound, a terpene compound with a phenolic derivative, and an isocyanate silane compound, which provides enhanced adhesion durability through dual curing systems and improved wetting properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional urethane adhesive composition is applied to olefin resin without primer treatment, then the application process is simplified, but the adhesion durability does not meet required standards
Solution Approach 1:
The invention changes the chemical composition parameters of the adhesive by incorporating specific silane compounds (isocyanate silane and secondary aminosilane) and isocyanurate compounds. These parameter changes enable the adhesive to achieve durable bonding to olefin resin without requiring primer treatment, thus maintaining application simplicity while improving adhesion durability
Solution Approach 2:
The invention creates a composite adhesive system by combining urethane prepolymer, isocyanurate compound, silane compound, and terpene compound. This composite formulation provides both the simplicity of direct application and the durability needed for automotive applications, resolving the contradiction between ease of manufacture and reliability
2Reliability
If a primer treatment is applied to olefin resin before adhesive bonding, then adhesion durability is improved, but the manufacturing process becomes more complex
Solution Approach 1:
The invention extracts and eliminates the primer treatment step from the manufacturing process. By formulating the urethane adhesive with specific silane and isocyanurate compounds, the adhesive itself gains the ability to bond durably to olefin resin without requiring the separate primer layer, thus removing the source of process complexity while maintaining adhesion durability
3Strength
If the adhesive composition is formulated for high adhesion to olefin resin, then bonding strength is improved, but the formulation becomes more complex
Solution Approach 1:
The silane compounds and isocyanurate compounds in the formulation serve multiple functions: they provide adhesion promotion to olefin resin, enable crosslinking for enhanced strength, and contribute to moisture curing. This multi-functionality allows the formulation to achieve high bonding strength without proportionally increasing complexity, as the same components address multiple performance requirements
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 exhibits excellent adhesion durability and initial adhesiveness to olefin resin materials, even without primer treatment, ensuring robust bonding and performance under various environmental conditions.
Implementation Method 1
a secondary aminosilane compound; a terpene compound, wherein the terpene compound comprises a phenolic derivative of a terpene; and an isocyanate silane compound
Implementation Method 2
silane crosslinked structures formed by the secondary aminosilane compound and the isocyanate silane compound
Implementation Method 3
a urethane prepolymer having an isocyanate group... a compound (D) having two or more active hydrogen groups per molecule
Implementation Method 4
improved wetting properties... excellent adhesion durability and initial adhesiveness to olefin resin materials
Data Source
AI summary
An object of the present invention is to provide a urethane adhesive composition excellent in adhesion durability for an olefin resin. The present invention is a urethane adhesive composition containing a urethane prepolymer having an isocyanate group, an isocyanurate compound of pentamethylene diisocyanate and/or hexamethylene diisocyanate, and a secondary aminosilane compound.