Flame-Treated Crystalline Thermoplastic Adhesion Without Primer
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Solution Overview
Problem
The existing methods for manufacturing multilayer members using crystalline thermoplastic resins in automobiles do not provide sufficient adhesiveness without the use of a primer, which is a challenge in meeting the increasing demands for safety and fuel economy.
Innovation Solution
A method involving dry treatment of the first member containing a crystalline thermoplastic resin with a reducing flame, followed by the application of an adhesive layer without a primer, and subsequent adherence of a second member, ensuring excellent adhesiveness through surface hydrophilization and crystal structure anchoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a primer composition is used to improve adhesiveness, then adhesiveness is improved, but process complexity and cost increase
Solution Approach 1:
The invention extracts and eliminates the primer composition step from the traditional multilayer manufacturing process. By directly treating the crystalline thermoplastic resin surface and applying adhesive without a primer, the process complexity is reduced while maintaining or improving adhesiveness through optimized surface treatment and adhesive formulation.
Solution Approach 2:
The invention performs preliminary surface treatment on the crystalline thermoplastic resin member before adhesive application. This preliminary action modifies the surface properties (such as introducing polar groups or increasing surface energy) to enhance direct adhesive bonding, eliminating the need for a primer while ensuring sufficient adhesiveness.
2Device complexity
If dry treatment is performed to improve adhesiveness without primer, then process simplification is achieved, but adhesiveness is insufficient
Solution Approach 1:
The invention changes the parameters of the surface treatment process, specifically using flame treatment or plasma treatment at controlled conditions to sufficiently modify the crystalline thermoplastic resin surface. This parameter optimization ensures that the surface gains adequate bonding activity for direct adhesive application without requiring a primer, thus maintaining both process simplification and sufficient adhesiveness.
Solution Approach 2:
The invention uses composite adhesive formulations that are specifically designed to bond with flame-treated or plasma-treated crystalline thermoplastic resin surfaces. These composite adhesives contain functional groups that interact with the treated surface, enabling strong bonding without a primer while maintaining process simplicity.
3Reliability
If flame treatment with reducing flame is applied, then surface hydrophilization is achieved for better adhesion, but manufacturing precision requirements increase
Solution Approach 1:
The flame treatment process is designed to be self-regulating, where the reducing flame automatically creates the appropriate surface modification on the crystalline thermoplastic resin. The process parameters (flame temperature, exposure time, distance) are optimized so that the treatment achieves sufficient surface hydrophilization without requiring extremely tight control, thus balancing adhesion improvement with manufacturing feasibility.
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
This method achieves excellent adhesiveness between the multilayer members without the use of a primer, enhancing the structural integrity and performance of automotive components.
Implementation Method 1
The dry treatment of the first member is flame treatment, and in the flame treatment, the surface of the first member is subjected to a reducing flame of a flame
Implementation Method 2
ensuring excellent adhesiveness through surface hydrophilization and crystal structure anchoring
Implementation Method 3
an adhesive application step of forming an adhesive layer in a surface subjected to the dry treatment of the first member by applying an adhesive to the surface subjected to the dry treatment of the first member
Data Source
AI summary
A method for manufacturing a multilayer member that provides excellent adhesiveness without using a primer. An embodiment of the present invention provides a method for manufacturing a multilayer member including a first member containing a crystalline thermoplastic resin, an adhesion layer, and a second member in this order, the method including a surface treatment step of performing dry treatment on a surface of the first member containing a crystalline thermoplastic resin, satisfying the following condition A, an adhesive application step of forming an adhesive layer in a surface subjected to the dry treatment of the first member by applying an adhesive to the surface subjected to the dry treatment of the first member without interposing a primer composition, and an adhering step of making the second member adhere onto the adhesive layer.