Urethane Adhesive Composition with Terpene Curing Agent
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Solution Overview
Problem
The challenge is to achieve excellent adhesion of resin materials without using a primer, which is often necessary for flame-processed materials, while also addressing environmental concerns related to solvents in traditional primers.
Innovation Solution
A two-part curable urethane adhesive composition is developed, featuring a urethane prepolymer and a curing agent with a terpene compound, specifically monoterpenes, hydrogenated monoterpenes, or their modified forms, along with polybutadiene diol, which provides excellent adhesion to resin materials without the need for a primer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a primer containing solvent is used for adhesion of resin materials, then adhesion performance 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 while retaining the essential adhesion-promoting functions through the use of a two-component urethane adhesive system where Component A (urethane prepolymer) and Component B (polyol with active hydrogen groups) react to form the adhesive bond without requiring solvent-based primers
Solution Approach 2:
The invention changes the chemical composition parameters by using specific polyols with defined active hydrogen groups (such as polyester polyols, polyether polyols, or polycarbonate polyols) and controlling the NCO/OH ratio to achieve optimal adhesion without solvents, transforming the primer from a solvent-based system to a high-solids reactive system
2Strength
If flame processing is applied to resin materials to improve adhesion, then adhesion performance is improved, but process complexity increases
Solution Approach 1:
The invention performs preliminary chemical modification of the resin surface by incorporating adhesion promoters or plasma treatment agents in the adhesive formulation itself, eliminating the need for separate flame processing steps while achieving equivalent or superior adhesion readiness
Solution Approach 2:
The invention introduces intermediary substances such as silane coupling agents or titanate couplers in the adhesive formulation that act as chemical mediators between the resin substrate and the urethane adhesive, providing bridging functionality that replaces the physical activation effect of flame processing
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
This composition exhibits superior adhesion to resin materials, particularly olefin resins, without the use of a primer, while minimizing environmental impact by eliminating solvent-based primers, and maintains strong adhesion even after heat aging.
Implementation Method 1
a base agent containing a urethane prepolymer and a curing agent containing a compound having two or more active hydrogen groups in each molecule
Implementation Method 2
two-part curable urethane adhesive composition
Implementation Method 3
the curing agent containing at least one type of terpene compound selected from the group consisting of monoterpenes, hydrogenated monoterpenes, modified monoterpenes formed by modifying the monoterpenes or the hydrogenated monoterpenes with hydroxy groups
Data Source
AI summary
An object of the present invention is to provide a two-part curable urethane adhesive composition that exhibits excellent adhesion to a resin material without the use of a primer. The two-part curable urethane adhesive composition of the present invention contains a base agent containing a urethane prepolymer, and a curing agent containing a compound having two or more active hydrogen groups in each molecule. The curing agent contains at least one type of terpene compound selected from the group consisting of monoterpenes, hydrogenated monoterpenes, modified monoterpenes formed by modifying the monoterpenes or the hydrogenated monoterpenes with hydroxy groups, and oligomers having from 2 to 6 repeating units derived from the monoterpenes or the modified monoterpenes.