Die-Cast Metal-Polymer Composite Bonding for Airtight Strength
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Solution Overview
Problem
Existing methods for preparing metal-polymer resin composites fail to achieve sufficient tensile strength and airtightness when applied to zinc or magnesium alloys used in die-casting, due to the presence of impurities and smut, leading to increased thickness, curing time, and low bonding strength.
Innovation Solution
A method involving degreasing, etching, desmutting, ultrasonic cleaning, and electrolyzing using specific electrolytes containing hydroxides, phosphates, sulfates, and silicates to remove impurities and form nanopores, followed by direct injection molding of the polymer resin.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If typical aluminum bonding methods are applied to zinc or magnesium alloys, then the process can be simplified, but tensile strength and airtightness are insufficient
Solution Approach 1:
The patent modifies the electrolyte composition parameters by incorporating specific compounds (sodium carbonate, sodium hydroxide, phosphoric acid, sulfuric acid, oxalic acid, citric acid, hydrogen peroxide, ammonia, zinc sulfate, magnesium sulfate) in optimized concentrations to achieve effective pore formation and bonding on zinc/magnesium alloys, resolving the incompatibility of standard aluminum processes with die-casting materials
Solution Approach 2:
The patent performs preliminary surface treatment steps including degreasing, etching, and electrolyzing before polymer injection to prepare the metal surface, ensuring optimal bonding conditions are established in advance and eliminating the need for additional adhesive layers
2Strength
If double-sided tape or glue is used to bond die-casting parts, then bonding can be achieved, but thickness increases and curing time extends
Solution Approach 1:
The patent extracts and eliminates the adhesive layer (double-sided tape or glue) from the bonding system, achieving direct polymer-to-metal bonding through surface preparation and electrolyzing, thereby removing the curing time requirement and reducing overall thickness
Solution Approach 2:
The patent introduces an intermediary electrolyte treatment process that facilitates direct bonding between the metal surface and polymer resin, acting as a chemical bridge that eliminates the need for mechanical adhesives and reduces bonding time
3Stability of the object's composition
If impurities and smut are present on the metal surface, then the material composition is maintained, but bonding strength and airtightness deteriorate
Solution Approach 1:
The patent performs preliminary surface cleaning and etching operations before electrolyzing to remove impurities and smut, ensuring the metal surface is properly prepared for bonding while maintaining the base material composition
Solution Approach 2:
The patent changes the surface chemistry parameters through electrolyzing in specific electrolyte solutions, transforming the surface properties to enhance bonding while preserving the bulk material composition of the zinc or magnesium alloy
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 method results in a metal-polymer resin composite with high bonding strength and airtightness, suitable for commercial applications, eliminating the need for additional adhesives and allowing for thin, three-dimensional shapes.
Implementation Method 1
electrolyzing to form micropores in aluminum and an oxide film on a surface thereof
Implementation Method 2
etching, and subsequently electrolyzing to form micropores in aluminum and an oxide film on a surface thereof
Implementation Method 3
a polymer resin is bonded to aluminum through injection, thereby preparing an aluminum-resin composite
Data Source
AI summary
The present invention relates to a metal-polymer resin composite in which a polymer resin is directly injection-molded to a zinc alloy, a magnesium alloy, or a die-casting part thereof, and thus an injection product is directly bonded to a metal surface, wherein in the case of a hard polymer resin, a tensile strength of the metal and the polymer resin is 30 MPa or greater, and in the case of a soft polymer resin, a tensile strength of the metal and the polymer resin is 20 MPa or greater, and an average helium leakage after 10 times of measurement is 10−8 Pa·m3/s or less, and a novel method for preparing the same.