Epoxy Adhesive Curing Agent for High Humidity Bond Strength
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Solution Overview
Problem
Conventional epoxy resin adhesives fail to maintain sufficient bond strength under high humidity conditions, which is critical for ensuring product reliability in applications like automobiles and industrial machinery.
Innovation Solution
A curing agent comprising reactive terminated polydiene, reactive polyamine, and amidine, specifically designed to enhance adhesiveness and moisture resistance, is used in combination with an epoxy resin to form an adhesive that maintains bond strength even under high humidity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional epoxy resin adhesive is used, then good initial bond strength is achieved, but bond strength cannot be maintained under high humidity conditions
Solution Approach 1:
The patent modifies the chemical composition parameters of the curing agent by incorporating specific ratios of polyether polyamine (30-70 wt%), non-polyether polyamine (10-50 wt%), and amidine (1-20 wt%). This parameter change in the curing agent composition enables the adhesive to maintain bond strength under high humidity conditions while achieving good initial bonding performance
Solution Approach 2:
The patent creates a composite curing agent system by combining multiple types of amines (polyether polyamine, non-polyether polyamine) with amidine compounds. This composite approach synergistically improves both initial bond strength and moisture resistance, resolving the contradiction between initial performance and humidity resistance
2Strength
If amine-terminated rubber and polyether are used as curing agents, then mechanical strength and collision resistance are improved, but bond strength deteriorates under high temperature and high humidity
Solution Approach 1:
The patent optimizes the compositional parameters of the curing agent by specifying precise weight percentage ranges for each component. The inclusion of amidine in 1-20 wt% range and the balanced ratio between polyether and non-polyether polyamines create a formulation that maintains both mechanical strength and humidity resistance
Solution Approach 2:
The patent introduces amidine compounds as an intermediary substance that mediates between the epoxy resin and the amine components. This intermediary role of amidine enhances the overall performance of the adhesive system, particularly improving resistance to high temperature and humidity while maintaining mechanical properties
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 adhesive achieves good bond strength and moisture resistance, ensuring durability and reliability of bonded products even after storage under high humidity.
Implementation Method 1
A curing agent (B) for an epoxy resin, comprising: a reactive terminated polydiene (B1); a reactive polyamine (B2); and an amidine (B3).
Implementation Method 2
An adhesive, comprising: an epoxy resin (A); and a curing agent (B), wherein the curing agent (B) comprises a reactive terminated polydiene (B1), a reactive polyamine (B2), and an amidine (B3).
Data Source
AI summary
Excellent adhesive strength can be maintained to improve product reliability, even after storage under high humidity, by a curing agent (B) for an epoxy resin, the curing agent (B) containing a reactive terminated polydiene (B1), a reactive polyamine (B2), and an amidine (B3).