Acrylic Adhesive Sheet for Automotive Electronics
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Solution Overview
Problem
Conventional adhesives used in the automobile industry, such as epoxy, urethane, polyisobutylene, and paraxylene, face limitations in high-temperature stability, thermal expansion stress absorption, humidity stability, solvent resistance, and cost, which restrict their application in electronic components of electric and hybrid cars.
Innovation Solution
An adhesive sheet with an acrylic resin composition containing alkyl (meth) acrylate, hydroxyl-containing monomers, aliphatic saturated hydrocarbon ring-containing monomers, UV absorbers, and photopolymerization initiators, which provides excellent adhesion, light resistance, and elastic modulus without the need for a separate primer layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If epoxy is used for adhesion, then wear resistance and chemical resistance are improved, but thermal expansion stress absorption deteriorates and high-temperature stability deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters by using acrylic resin instead of epoxy, and adjusts the molecular structure to achieve both wear resistance and thermal expansion stress absorption capabilities
Solution Approach 2:
The patent creates a composite adhesive system combining acrylic resin with specific additives and modifiers to achieve multiple functions including wear resistance, chemical resistance, and thermal expansion stress absorption simultaneously
2Strength
If urethane is used for adhesion, then adhesion to various substrates is improved, but humidity stability deteriorates
Solution Approach 1:
The patent changes the chemical composition from urethane to acrylic resin with modified molecular structure to achieve both broad substrate adhesion and high humidity stability
3Strength
If polyisobutylene is used for adhesion, then adhesion to various substrates is improved, but solvent and chemical resistance deteriorates
Solution Approach 1:
The patent changes the chemical composition from polyisobutylene to acrylic resin with enhanced molecular structure to achieve both broad substrate adhesion and improved solvent and chemical resistance
4Ease of manufacture
If conventional adhesives are used, then application simplicity is improved, but light resistance deteriorates
Solution Approach 1:
The patent changes the chemical composition to acrylic resin with UV absorbers and light stabilizers to achieve both application simplicity and excellent light resistance
Solution Approach 2:
The patent introduces UV absorbers and light stabilizers as intermediary substances that protect the adhesive from light degradation while maintaining application simplicity
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 sheet exhibits improved adhesion, durability, and reliability under various conditions, including high temperatures and humidity, with reduced stress from thermal expansion and excellent light resistance, making it suitable for electronic components in automobiles and other applications.
Implementation Method 1
a resin composition including: 100 parts by weight of an alkyl (meth) acrylate; 45 to 90 parts by weight of hydroxyl-containing monomers; 45 to 110 parts by weight of an aliphatic saturated hydrocarbon ring-containing monomer; 10 to 50 parts by weight of a UV absorber; and 5 parts by weight or less of a photopolymerization initiator
Data Source
AI summary
An adhesive sheet utilizes an acrylic resin composition without using a separate primer layer, thus providing excellent adhesion, high reliability due to its excellent light resistance under the sunlight exposure, and excellent elastic modulus, and can be easily used as an adhesive material in various fields such as building materials and automobiles.