Polyamide Resin Metal Composite High Temperature Bonding
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Solution Overview
Problem
The bonding strength of polyamide-based resin and metal composite structures is insufficient, particularly at high temperatures, due to inadequate fluidity of the resin during injection molding, which prevents sufficient permeation into the metal's fine uneven surface.
Innovation Solution
A metal/resin composite structure is developed using a polyamide-based resin with specific DSC heat characteristics, including a glass transition temperature between 85°C and 140°C, and a crystallization temperature between 250°C and 292°C, along with the inclusion of inorganic fillers and metal soaps, to enhance bonding strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If surface-roughened metal member is used for injection bonding, then bonding area is increased, but bonding strength is insufficient due to inadequate resin fluidity
Solution Approach 1:
The patent changes the thermal parameters of the polyamide-based resin by controlling its glass transition temperature (Tg) to 85-140°C and crystallization temperature (Tc) to 250-292°C. This parameter optimization ensures the resin maintains appropriate fluidity during injection molding to充分 permeate the metal surface recesses, while achieving sufficient bonding strength and high-temperature reliability in the final composite structure.
Solution Approach 2:
The patent uses a composite resin system consisting of polyamide-based resin combined with inorganic fillers and metal soaps. This composite material formulation enhances the resin's bonding characteristics and thermal performance, enabling it to maintain adequate fluidity during processing while achieving superior bonding strength and high-temperature reliability.
2Ease of manufacture
If polyamide-based resin with standard properties is used, then processing is simplified, but bonding strength at high temperature is insufficient
Solution Approach 1:
The patent optimizes the thermal parameters of the polyamide-based resin, specifically setting the glass transition temperature (Tg) to 85-140°C and crystallization temperature (Tc) to 250-292°C. These parameter changes enable the resin to maintain appropriate fluidity during injection molding for easy processing, while ensuring sufficient bonding strength and high-temperature performance in the final product.
Solution Approach 2:
The patent adds inorganic fillers and metal soaps to the polyamide-based resin to create localized functional enhancements. The metal soaps specifically improve bonding to the metal surface, while inorganic fillers enhance thermal stability, allowing the resin to maintain both ease of manufacture and high-temperature bonding strength.
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 solution significantly improves the bonding strength between the polyamide-based resin and metal, ensuring strong adhesion even at high temperatures, suitable for applications like engine mount brackets.
Implementation Method 1
sufficient fluidity so that a polyamide-based resin composition can sufficiently permeate recesses of a fine uneven structure formed on a surface of the metal member during the injection molding
Implementation Method 2
designing resin quality of a polyamide-based resin component so as realize retarded recrystallization of the resin member during the injection
Implementation Method 3
a glass transition temperature (Tg) observed by a differential scanning calorimeter (DSC) is equal to or higher than 85°C and equal to or lower than 140°C
Data Source
AI summary
A metal/resin composite structure includes: a metal member (M) having a fine uneven surface; and a polyamide-based resin member (A) bonded to the metal member (M), and the polyamide-based resin member (A) satisfies the following condition [A1] and condition [A2]:[A1] a glass transition temperature (Tg) observed by a differential scanning calorimeter (DSC) is equal to or higher than 85° C. and equal to or lower than 140° C.; and[A2] a crystallization temperature (Tc) observed by a differential scanning calorimeter (DSC) is equal to or higher than 250° C. and equal to or lower than 292° C.