Polyamide Composition Stabilized with Copper Oxide and KBr
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Solution Overview
Problem
Polyamide compositions face instability and mechanical property loss when exposed to heat and light, particularly in applications like the automotive sector, where existing stabilization methods are not sufficient or cost-effective.
Innovation Solution
A polyamide composition stabilized with copper oxide (Cu2O) and potassium bromide (KBr), optionally combined with other stabilizing agents like KI, hindered phenolic compounds, or phosphorus stabilizers, to maintain mechanical properties and color integrity under heat and light exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional stabilizing agents (copper iodide, potassium iodide, HALS, phosphorus stabilizers) are used to improve heat and light stability of polyamide, then stabilization effectiveness is improved, but manufacturing cost increases
Solution Approach 1:
The patent changes the chemical composition parameters of the stabilization system by replacing copper iodide with copper oxide and potassium iodide with potassium bromide. This substitution maintains the stabilizing functionality while reducing manufacturing cost, as copper oxide and potassium bromide are more economical than the conventional copper iodide and potassium iodide combination.
Solution Approach 2:
The patent employs a cost-effective stabilization system using inexpensive copper oxide and potassium bromide compounds. These materials provide effective heat and light stability at lower cost compared to expensive conventional stabilizers like HALS (hindered amine light stabilizers) and complex phosphorus stabilizers, making the solution economically viable for mass production.
2Strength
If polyamide is exposed to heat and light in automotive applications, then mechanical properties are maintained initially, but deterioration occurs over time leading to loss of mechanical properties and color changes
Solution Approach 1:
The patent applies a preliminary stabilization treatment by incorporating copper oxide and potassium bromide into the polyamide composition before exposure to heat and light. This preventive measure creates a protective system that actively scavenges free radicals and decomposes peroxides formed during exposure, thereby maintaining mechanical properties and preventing deterioration over extended periods.
Solution Approach 2:
The stabilization system provides continuous protection against heat and light degradation throughout the service life of the polyamide component. The copper oxide and potassium bromide work continuously to neutralize harmful radicals and peroxides formed during exposure, ensuring sustained mechanical property retention and color stability over long durations in harsh automotive 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 composition effectively retains mechanical properties and initial color after long exposure to heat and light, offering improved stability at a lower cost compared to existing solutions.
Implementation Method 1
a copper oxide and KBr, as defined in claim 1... stabilized against heat and light comprising a stabilization system comprising copper oxide and KBr
Implementation Method 2
improve the stability of polyamides against heat and/or light... excellent maintenance of mechanical properties after exposure to heat or in the light
Data Source
AI summary
The invention relates to a heat- and light-stabilised polyamide composition including a stabilisation system that comprises copper oxide and KBr, and having an excellent conservation of the mechanical properties after exposure to heat or light. The invention also relates to a method for making these compositions, and more particularly to the use of said compositions for making articles for the automotive industry.