Polyamide Resin Molded Article Surface Molecular Weight Stabilization
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Solution Overview
Problem
Existing methods for producing fiber-reinforced resin molded articles, particularly those using polyamide resin and carbon fibers, face challenges in maintaining molecular weight and appearance when subjected to high temperature and oxygen environments during cold press molding, leading to poor durability and moldability.
Innovation Solution
A method involving a resin composition with polyamide resin, copper iodide, potassium iodide, and carbon fibers, where the copper iodide content is 0.1 parts by mass or more relative to the polyamide resin, and the mass ratio of potassium iodide to copper iodide is between 0 and 3.0, with cold pressing and the presence of copper and potassium halide in the surface layer, helps maintain molecular weight and improve moldability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If cold press molding is used to achieve short tact time and excellent moldability, then productivity is improved, but molecular weight on the surface decreases due to direct oxygen contact in high temperature environment
Solution Approach 1:
A copper-based stabilizer acts as an intermediary substance between the polyamide resin and oxygen during high-temperature preheating. The stabilizer preferentially reacts with oxygen or inhibits oxygen attack on the resin, protecting the molecular weight while allowing the preheating process to proceed for rapid molding
Solution Approach 2:
The invention changes the chemical composition parameters of the resin system by adding copper-based stabilizer (0.1-5.0 parts by mass relative to 100 parts by mass of polyamide resin) and controlling the ratio of copper compound to potassium halide (0.1-10.0 by mass). This parameter change enables the material to withstand high-temperature preheating without molecular weight degradation
2Ease of manufacture
If high temperature preheating is applied to improve moldability in cold press molding, then ease of manufacture is improved, but appearance deteriorates due to molecular weight decrease on surface
Solution Approach 1:
The copper-based stabilizer serves as a protective intermediary during high-temperature preheating, allowing the process to proceed for improved moldability while preventing surface degradation that would harm appearance
Solution Approach 2:
The invention converts the potentially harmful high-temperature oxygen environment into a beneficial process by using the copper stabilizer to control and direct the thermal processing, transforming what would be a damaging condition into a useful preheating step that improves moldability without sacrificing appearance
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 effectively suppresses molecular weight decrease on the surface of the molded article, ensuring excellent appearance and durability, even under severe heating conditions, while maintaining excellent moldability and weather resistance.
Implementation Method 1
the decrease of a molecular weight on the surface of a molded article generated by directly contacting oxygen in high temperature environment during preheating
Data Source
AI summary
The present invention provides a method for producing a molded article by pressing a composite material containing a resin composition and carbon fibers, wherein the resin composition contains a polyamide resin, a copper compound and potassium halide, and (1) the copper compound content is 0.1 parts by mass or more relative to 100 parts by mass of the polyamide resin.