Halogen-Free Polyamide Composite for Glow Wire Resistant Connectors
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Solution Overview
Problem
Existing polyamide compositions used in electrical connectors face challenges in meeting IEC glow wire standards without halogen-based flame retardants, while maintaining good mechanical properties and insulation performance.
Innovation Solution
A polyamide composition comprising polyamide, inorganic fibers, metal phosphinate, and a nitrogen-containing synergist, such as melam or melem, achieves high Glow Wire Ignition Temperature, V0 rating, and comparative tracking index without halogen-based flame retardants, maintaining mechanical properties like impact strength and tensile strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If halogen-based flame retardants are added to polyamide composition, then ignition resistance is improved, but environmental safety deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters by replacing halogen-based flame retardants with a halogen-free system consisting of metal phosphinate and nitrogen-containing synergist. This parameter substitution maintains the flame retardant function while eliminating environmental harm, achieving GWIT of 775°C or more without halogens.
Solution Approach 2:
The patent creates a composite flame retardant system by combining metal phosphinate with nitrogen-containing synergists (melam, melem, or mixtures thereof). This composite approach achieves synergistic effects that provide effective flame resistance without halogens, resolving the contradiction between reliability and environmental safety.
2Object-affected harmful factors
If halogen-free flame retardants are used in polyamide resin, then environmental safety is improved, but mechanical properties deteriorate
Solution Approach 1:
The patent optimizes the concentration parameters of the flame retardant system, using metal phosphinate at 5-30 wt% and nitrogen-containing synergist at 1-30 wt%. This precise parameter control achieves the desired balance between environmental safety and mechanical property retention.
Solution Approach 2:
The nitrogen-containing synergist acts as an intermediary that enhances the effectiveness of metal phosphinate, allowing lower concentrations of flame retardant to be used while maintaining both environmental safety and mechanical properties. The synergist mediates between the flame retardant function and mechanical property preservation.
3Reliability
If flame retardant system is added to polyamide composition, then ignition resistance is improved, but manufacturing complexity increases
Solution Approach 1:
The patent merges the flame retardant function into a integrated system where metal phosphinate and nitrogen-containing synergist work together as a unified composition. This combining approach simplifies the overall system by using a coordinated pair of additives rather than multiple separate components, achieving GWIT of 775°C or more with a manageable composition structure.
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 a Glow Wire Ignition Temperature of 775°C or more, V0 rating, and a comparative tracking index of 550 volts or more, while maintaining good mechanical properties like Charpy impact strength and tensile strength, thus meeting safety and performance standards.
Implementation Method 1
the nitrogen-containing synergist is comprised of a nitrogen compound that displays less than 1% weight loss under a nitrogen atmosphere at a temperature of from 200° C. to 300° C., such as from 200° C. to 400° C.
Implementation Method 2
a flame retardant system comprising a metal phosphinate and a nitrogen-containing synergist
Implementation Method 3
a flame retardant system comprising a metal phosphinate and a nitrogen-containing synergist
Data Source
AI summary
A polyamide composition comprising a polyamide; a plurality of inorganic fibers; and a flame retardant system is disclosed. At a thickness of 0.8 mm, the composition exhibits a Glow Wire Ignition Temperature of about 775° C. or more as determined in accordance with IEC-60695-2-13:2010.