Polyamide Elastomer Metal Bonding for Humidity Resistance
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Solution Overview
Problem
The existing methods for bonding thermoplastic resin with metal materials face challenges in achieving strong and durable bonds, especially when exposed to water or high humidity, leading to reduced bonding strength and potential peeling of the resin from the metal.
Innovation Solution
The use of a polyamide elastomer as the thermoplastic resin, either alone or in combination with an inorganic filler such as metal hydroxide, to form a composite body that exhibits excellent bonding strength with metal, even in wet or humid conditions, through contact bonding techniques like injection molding or hot pressing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional thermoplastic resin is used for bonding with metal, then the component achieves lighter weight and lower cost, but the bonding strength is insufficient and the component has inadequate resistance to chemical substances and high temperatures
Solution Approach 1:
The patent uses a composite material system consisting of thermoplastic resin and metal, where the resin provides lightweight and cost-effective properties while the metal provides strength and chemical resistance. The composite structure allows each material to contribute its advantageous properties to the final component performance.
Solution Approach 2:
The patent optimizes bonding parameters including surface treatment of metal, resin composition formulation, and bonding process conditions (temperature, pressure, time) to achieve strong and reliable bonds that maintain performance under chemical and thermal exposure.
2Reliability
If metal and resin are compositing or multi-layering to improve surface texture and corrosion resistance, then surface properties are enhanced, but the bonding strength of the component decreases due to poor bonding between metal and resin
Solution Approach 1:
The patent introduces surface treatment layers or coupling agents as intermediaries between the metal and resin. These intermediaries improve the interfacial adhesion and chemical bonding between the dissimilar materials, ensuring strong bonding while maintaining the protective and aesthetic surface properties of the composite structure.
Solution Approach 2:
The patent creates a multi-layer composite structure with optimized interfaces between metal and resin layers. The composite design includes intermediate layers or surface treatments that enhance interfacial bonding while preserving the individual functional properties of each material layer.
3Strength
If water-absorbing resin such as Nylon is firmly bonded with metal through injection molding, then initial bonding strength is high, but the bonding strength decreases when exposed to water or high humidity due to water absorption of the resin
Solution Approach 1:
The patent addresses the harmful effect of water absorption by incorporating hydrophobic additives, surface treatments, or cross-linking agents that convert the resin's natural water-absorbing tendency into a beneficial property. These modifications allow the resin to maintain its water-absorbing capacity for desired functions while resisting water-induced bonding degradation through protected interfaces or modified polymer structure.
Solution Approach 2:
The patent applies surface treatments to the metal substrate before bonding, or incorporates water-resistant additives into the resin formulation in advance. These preliminary actions create a protective barrier or modify the material properties beforehand, preventing water from compromising the bond strength when the component is later exposed to humid or wet environments.
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 composite body achieves high bonding strength between the resin and metal, maintaining integrity even when exposed to water or high humidity, thereby enhancing the reliability and durability of the composite material.
Implementation Method 1
bonding strength between the resin and the metal
Implementation Method 2
water absorption of the resin
Data Source
Figure 1
AI summary
Provided is a composite body in which a resin and a metal are contact-bonded with excellent adhesive force. Also provided is a composite body which is suppressed in decrease of bonding strength between a resin and a metal due to water absorption of the resin even if the composite body is left in rain or water, or is left in a high humidity environment or the like for a long period of time. The present invention relates to a composite body which is obtained by contact-bonding a thermoplastic resin (A) and a metal (B), and which is characterized in that the thermoplastic resin (A) is a polyamide elastomer (1A) or a thermoplastic resin composition (2A) that contains a water absorbent thermoplastic resin (2a) and a metal hydroxide (2b).