Renewable Epoxy Adhesive with CTBN Toughening
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Solution Overview
Problem
Developing adhesive compositions that demonstrate high Wedge Impact Peel resistance and toughness over a wide temperature range, while maintaining stability and being cost-effective, is challenging due to rising raw material costs and the need for environmentally friendly alternatives.
Innovation Solution
A curable, one-package adhesive composition comprising a resin component with polyepoxide and carboxy-terminated butadiene acrylonitrile polymer, a polyamine with primary, secondary, and ketimine functional groups, and a curing component with dicyandiamide and an accelerator made from renewable resources, such as a reaction product of a polyol, diisocyanate, and dialkyl monoamine.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If adhesive compositions are developed to achieve high Wedge Impact Peel resistance and toughness over a wide temperature range, then performance at extreme temperatures is improved, but raw material costs increase and shelf life stability becomes more difficult to maintain
Solution Approach 1:
The patent incorporates a pre-reacted polyepoxide-carboxy-terminated butadiene acrylonitrile polymer adduct as a key component. This preliminary chemical reaction between the polyepoxide and CTBN creates a modified polymer structure that provides both low-temperature toughness and thermal stability, allowing the adhesive to maintain performance across wide temperature ranges while improving shelf life stability.
Solution Approach 2:
The adhesive composition uses a composite resin system combining polyepoxide with carboxy-terminated butadiene acrylonitrile polymer (CTBN). This composite material approach creates a synergistic effect where the polyepoxide provides base adhesive properties and CTBN contributes low-temperature flexibility and toughness, achieving high Wedge Impact Peel resistance while maintaining composition stability.
2Ease of manufacture
If renewable resources are used to replace petrochemical raw materials, then environmental friendliness and cost-effectiveness are improved, but performance consistency across wide temperature ranges becomes more challenging
Solution Approach 1:
The patent utilizes renewable resources such as soybean oil-derived polyols and other bio-based chemicals to create the adhesive composition. By carefully controlling the chemical parameters and reaction conditions during formulation, the invention achieves performance consistency across wide temperature ranges while using environmentally friendly, cost-effective renewable materials.
Solution Approach 2:
The invention employs renewable resources that are more cost-effective and environmentally friendly than traditional petrochemical materials. The use of bio-based polyols and other renewable chemicals provides economical raw materials that can be sustainably produced, reducing dependence on volatile oil prices while maintaining adhesive performance.
3Strength
If the adhesive composition is designed for low-temperature performance at -40°C, then Wedge Impact Peel resistance is improved, but viscosity control and shelf life stability become more difficult
Solution Approach 1:
The patent incorporates a pre-reacted polyepoxide-carboxy-terminated butadiene acrylonitrile polymer adduct as a key component. This preliminary chemical reaction between the polyepoxide and CTBN creates a modified polymer structure that provides both low-temperature toughness and thermal stability, allowing the adhesive to maintain performance across wide temperature ranges while improving shelf life stability.
Solution Approach 2:
The invention carefully controls the molecular weight, functionality, and reaction parameters of the polyepoxide and CTBN components to achieve optimal balance between low-temperature performance and viscosity stability. The carboxy-terminated CTBN reacts with polyepoxide to form a crosslinked structure that maintains flexibility at -40°C while controlling overall composition viscosity for stable shelf 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 provides stable adhesion and resistance across extreme temperatures, including -40°C, with improved shelf life and cost-effectiveness through the use of renewable materials, maintaining viscosity within acceptable limits even after 8 weeks of aging.
Implementation Method 1
At least a portion of the polyepoxide in the resin component (a) is reacted with carboxy-terminated butadiene acrylonitrile polymer
Implementation Method 2
a curing component comprising dicyandiamide and an accelerator
Implementation Method 3
maintaining viscosity within acceptable limits even after 8 weeks of aging
Data Source
AI summary
Curable, one-package, stable adhesive compositions are provided comprising:(a) a resin component comprising a polyepoxide,(b) a polyamine having at least two primary amine, secondary amine, and/or ketimine functional groups; and(c) a curing component comprising dicyandiamide and an accelerator. At least a portion of the polyepoxide in the resin component is reacted with carboxy-terminated butadiene acrylonitrile polymer. The accelerator comprises a reaction product comprising a renewable polyol, a diisocyanate, and a dialkyl monoamine containing alkyl groups with at least two carbon atoms each. The compositions are suitable for use as adhesive compositions over a wide temperature range.