Thermally Conductive Curable Composition for Low Viscosity Pot Life
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Solution Overview
Problem
Existing curable compositions used in battery assemblies for electric vehicles have high viscosity and limited pot life, making them unsuitable for fast curing and extended use.
Innovation Solution
A curable composition comprising an epoxy resin, a thermally conductive filler, an amine compound with two or more amino groups, and a polyfunctional acrylate compound, with specific ratios and properties to achieve low viscosity and fast curability, extending pot life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a large amount of polyamide is used in the curable composition, then green strength after curing is improved, but viscosity before curing increases and pot life cannot be extended
Solution Approach 1:
The patent changes the chemical composition parameters by replacing polyamide with a polyol compound having specific functional groups (carboxyl, hydroxyl, or amino groups) in controlled amounts (0.1-10 mass%). This parameter change allows maintaining green strength while controlling viscosity and extending pot life, resolving the contradiction between strength improvement and viscosity control.
2Loss of time
If the curable composition is designed for fast curability at room temperature, then curing time is reduced, but it becomes difficult to maintain low compressive load for extended periods
Solution Approach 1:
The patent uses a polyol compound with specific functional groups (carboxyl, hydroxyl, or amino groups) in controlled amounts to modify the curing kinetics. This allows the composition to cure quickly at room temperature while maintaining low compressive load for extended periods, achieving both fast curability and extended pot life simultaneously.
Solution Approach 2:
The patent creates a composite curing system combining epoxy resin with polyol compounds having specific functional groups. This composite approach enables dual functionality: fast initial curing for reduced cycle time and sustained low compressive load for extended pot life, resolving the time-related contradiction.
3Ease of operation
If the viscosity of the curable composition is reduced for improved workability and dispensing, then filling and application become easier, but curability and adhesive force may be compromised
Solution Approach 1:
The patent adjusts the composition parameters by incorporating polyol compounds with specific functional groups in optimized amounts (0.1-10 mass%). This parameter optimization reduces viscosity for improved dispensing and filling workability while maintaining adequate curability and adhesive force through the synergistic interaction of the functional groups with epoxy resin.
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 low viscosity, fast curability, and extended pot life, enhancing productivity and workability in battery assembly processes.
Implementation Method 1
a curable composition including an epoxy resin, a thermally conductive filler, an amine compound (X) having two or more amino groups, and a polyfunctional acrylate compound
Implementation Method 2
a polyfunctional acrylate compound
Data Source
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AI summary
A curable composition comprising an epoxy resin, a thermally conductive filler, an amine compound (X) having two or more amino groups, and a polyfunctional acrylate compound, the amine compound (X) having a viscosity of 20 Pa·s or less measured at 25°C and 10 rpm using an E-type viscometer or having an oxyalkylene structure, a content of the amine compound (X) with respect to a total amount of resin components being 15 mass% or more and 55 mass% or less.