Organopolysiloxane Plasma Polymer Adhesive Structure Against Aging
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Solution Overview
Problem
Existing structural adhesives in automobiles suffer from aging deterioration phenomena, leading to a decrease in adhesive strength over time, which affects vehicle performance, and existing organic film countermeasures are costly or limit press working processes.
Innovation Solution
Incorporating plasma polymer layers containing organopolysiloxane as a main component with a thickness between 10 nm to 100 nm between adherends and adhesive layers, forming covalent bonds at interfaces to prevent water molecule adsorption and maintain bonding force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an organic film is applied to prevent aging deterioration of adhesive strength, then adhesive strength is maintained over time, but manufacturing cost increases and press working processes are limited
Solution Approach 1:
A plasma polymer layer containing organopolysiloxane is introduced as an intermediary between the adherend and the adhesive layer. This plasma polymer layer prevents water molecules from reaching the adhesive-adherend interface, thereby maintaining adhesive strength over time without requiring expensive organic films or limiting press working processes
Solution Approach 2:
The invention changes the protective layer from conventional organic films to a plasma polymer layer with specific thickness parameters (10 nm to 100 nm). This parameter change enables effective prevention of aging deterioration while being compatible with press working processes and reducing manufacturing costs
2Reliability
If an organic film is applied to prevent aging deterioration of adhesive strength, then adhesive strength is maintained over time, but press working processes are limited
Solution Approach 1:
The plasma polymer layer serves as a mediator that is compatible with press working processes. Unlike organic films that may decompose or limit processing, the plasma polymer layer withstands press working conditions while continuing to protect the adhesive interface from water molecules
Solution Approach 2:
By changing from organic film protection to plasma polymer layer protection with controlled thickness (10-100 nm), the system becomes adaptable to press working processes while maintaining adhesive strength, thus resolving the contradiction between reliability and adaptability
3Object-affected harmful factors
If the plasma polymer layer thickness is increased to improve protection, then water barrier performance improves, but the layer becomes brittle and destroys easily
Solution Approach 1:
The invention optimizes the thickness parameter of the plasma polymer layer to a specific range (10 nm to 100 nm). Within this range, the layer provides sufficient water barrier performance while maintaining flexibility and resistance to destruction. Thicknesses above 100 nm cause brittleness and easy destruction
4Ease of manufacture
If the plasma polymer layer thickness is decreased to reduce cost, then manufacturing cost decreases, but water barrier performance becomes insufficient
Solution Approach 1:
The invention establishes a minimum thickness parameter of 10 nm for the plasma polymer layer. At this threshold thickness, the layer provides sufficient water barrier performance to prevent aging deterioration while keeping manufacturing costs low. Thicknesses below 10 nm result in insufficient protection
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 structure effectively suppresses aging deterioration, maintaining adhesive strength over time and avoiding the drawbacks of organic film treatments, while being cost-effective and compatible with press working conditions.
Implementation Method 1
forming the first plasma polymer layer on the first adherend by a plasma polymer coating apparatus
Implementation Method 2
forming covalent bonds at interfaces to prevent water molecule adsorption
Data Source
AI summary
An adhesive structure includes a first adherend, a first plasma polymer layer, an adhesive layer, a second plasma polymer layer, and a second adherend in this order. Each of the first plasma polymer layer and the second plasma polymer layer contains an organopolysiloxane as a main component. A thickness of each of the first plasma polymer layer and the second plasma polymer layer is in a range of 10 nm to 100 nm.