Polyamide Resin Composition Thermal Aging Resistance
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Solution Overview
Problem
Current methods for enhancing the thermal aging resistance of polyamide resins, such as compounding with finely granulated element iron or metal powders, face challenges like instability, reproducibility issues, and limited effectiveness at high temperatures above 200°C for extended periods.
Innovation Solution
A polyamide resin composition is developed by combining a polyamide resin with a metal cyanide salt, specifically a transition metal cyanide compound, and another polyamide resin with lower oxygen permeability, along with a copper compound, to achieve enhanced thermal aging resistance and gas barrier properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If finely granulated element iron or metal powder is compounded with polyamide to enhance thermal aging resistance, then thermal aging resistance is improved, but preparation safety deteriorates due to ignition danger
Solution Approach 1:
The invention changes the chemical form of iron from elemental metal or metal powder to iron oxide particles. This parameter change eliminates the ignition hazard associated with fine metal powders while maintaining the thermal aging resistance enhancement effect. The iron oxide particles are chemically stable and do not pose fire risks during processing.
Solution Approach 2:
The invention uses iron oxide particles that can be easily handled and processed without special safety precautions, replacing the problematic fine metal powders. The iron oxide serves its function of enhancing thermal aging resistance without the associated safety risks, effectively discarding the harmful property while retaining the beneficial effect.
2Reliability
If copper compound and iron oxide are compounded with polyamide to improve thermal aging resistance, then thermal aging resistance is improved, but composition complexity increases
Solution Approach 1:
The invention extracts and removes the copper compound from the composition, retaining only iron oxide particles as the stabilizer. This eliminates the need for complex multi-component formulations while maintaining effective thermal aging resistance. The single-component iron oxide system is simpler to handle and process compared to mixtures of copper compounds and iron oxide.
3Reliability
If polyamide is compounded with thermostabilizer and composite oxide to enhance thermal aging resistance, then thermal aging resistance is improved, but stability and reproducibility deteriorate
Solution Approach 1:
The invention uses iron oxide particles that can be uniformly dispersed and distributed throughout the polyamide matrix, ensuring homogeneous composition. This homogeneity leads to stable and reproducible thermal aging resistance properties. The iron oxide particles maintain consistent performance across different batches and processing conditions, eliminating the stability and reproducibility issues associated with previous formulations.
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 composition exhibits excellent thermal aging resistance and maintains high mechanical strength even at 200°C for over 1000 hours, with improved gas barrier properties and stability.
Implementation Method 1
the metal cyanide salt enhances a gas barrier property of the polyamide resin
Data Source
AI summary
The present invention is a polyamide resin composition having a thermal aging resistance in a level which is resistant to a high-temperature and long-term environment of 200° C. and longer than 1000 hours. According to the present invention, there is provided a polyamide resin composition containing a polyamide resin (A) and another polyamide resin (B) which exhibits lower oxygen permeability than the polyamide resin (A), wherein a ratio by mass (A)/(B) of the polyamide resin (A) to the polyamide resin (B) is from 98/2 to 60/40, and wherein, to 100 parts by mass of the total amount of the polyamide resin (A) and the polyamide resin (B), 0.5 to 20 part (s) by mass of a metal cyanide salt of a composition formula (1) is compounded.