Two-Part Curable Adhesive Composition for Oleic Acid Resistance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Structural adhesives used in handheld electronic devices lack chemical resistance, particularly against oleic acid, which can deteriorate their properties when exposed to human skin chemicals.
Innovation Solution
A two-part curable adhesive composition comprising Part A with alkyl (meth)acrylate monomer, acrylonitrile-butadiene rubber with less than 45% acrylonitrile content, and a flexibilizing agent, and Part B with a catalyst, which together form a laminate with improved chemical resistance and mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional structural adhesives are used in handheld electronic devices, then fast curing speed and high impact resistance are achieved, but chemical resistance against oleic acid and skin chemicals deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters by incorporating acrylonitrile-butadiene rubber with specifically controlled acrylonitrile content (10-40%) and adding oleic acid as a key component (5-50% by weight). This parameter modification enables the adhesive to achieve chemical resistance against oleic acid while maintaining fast curing speed and adhesion strength
Solution Approach 2:
The invention creates a composite adhesive system combining acrylonitrile-butadiene rubber, oleic acid, and various functional additives (curing agents, catalysts, rheology modifiers). This composite formulation synergistically provides chemical resistance, mechanical strength, and resistance to deterioration from skin chemicals
2Reliability
If the adhesive composition is modified to improve chemical resistance, then oleic acid resistance is enhanced, but mechanical properties and dispensability may be compromised
Solution Approach 1:
The patent optimizes the acrylonitrile content parameter within a specific range (10-40%) and controls the oleic acid content (5-50% by weight) to achieve the right balance. This parameter optimization ensures chemical resistance is enhanced while mechanical properties such as tensile strength and elongation are maintained at acceptable levels
Solution Approach 2:
The adhesive formulation uses different components with specialized functions: acrylonitrile-butadiene rubber provides chemical resistance, oleic acid enhances adhesion and flexibility, while curing agents and catalysts maintain mechanical strength. Each component contributes locally to specific properties, achieving overall balance
3Reliability
If the adhesive formulation is changed to enhance chemical resistance, then resistance to oleic acid is improved, but dispensability and ease of application may deteriorate
Solution Approach 1:
The patent incorporates rheology modifiers and controls the molecular weight and viscosity of the adhesive components to maintain proper flow characteristics. This allows the chemically resistant adhesive to remain easily dispensable and applicable to various substrates without compromising chemical resistance
Solution Approach 2:
The formulation separates functional responsibilities: acrylonitrile-butadiene rubber and oleic acid provide chemical resistance, while rheology modifiers and appropriate monomer selection ensure proper viscosity and dispensability. This functional separation allows both chemical resistance and ease of application to coexist
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 composition exhibits excellent chemical resistance to oleic acid while maintaining mechanical properties and dispensability, making it suitable for use in electronic devices.
Implementation Method 1
This catalyst is a free-radical polymer initiator, in particular based on peroxide
Data Source
AI summary
The present invention provides a two-part curable adhesive composition consisting of: Part A comprising: (a) at least one alkyl (meth)acrylate monomer, (b) at least one acrylonitrile-butadiene rubber having an acrylonitrile content of less than 45% by weight, based on the total weight of the acrylonitrile-butadiene rubber, and (c) at least one flexibilizing agent selected from polyester-based urethane (meth)acrylate oligomer and/or (meth)acrylate terminated acrylonitrile-butadiene oligomer; and Part B comprising at least one catalyst.