Polyamide Moulding Composition for Low Fogging and High Heat Resistance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Polyamide moulding compositions for engineering and automotive applications face challenges in achieving high mechanical strength, reduced weight, and minimal fogging at high temperatures, particularly in electronic and lamp components.
Innovation Solution
A polyamide moulding composition comprising 45-75% partially crystalline polyamide with specific diamines and aromatic dicarboxylic acids, 5-20% fibrous reinforcing agents, 10-40% non-sized fillers, and 0-10% additives, optimized to achieve low condensable outgassing and high deflection temperature under load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If polyamide moulding compositions are reinforced by fillers to reduce weight and increase mechanical strength, then mechanical properties are improved, but fogging increases at high temperatures
Solution Approach 1:
The patent applies parameter changes by carefully controlling the composition ratios of diamines (4-18 carbon atoms) and aromatic dicarboxylic acids in the polyamide, and by optimizing the filler content (25-45 wt%) and type (non-sized fillers like glass beads, talc, or calcium carbonate). This specific parameter optimization reduces condensable outgassing while maintaining mechanical strength, achieving haze ≤10% at high temperatures.
Solution Approach 2:
The patent uses composite materials by combining polyamide with specific non-sized fillers (25-45 wt%) and fibrous reinforcing agents (5-20 wt%). This composite approach reduces weight while the non-sized fillers specifically suppress fogging by reducing condensable outgassing, achieving both improved mechanical properties and minimal haze at high temperatures.
2Reliability
If polyamide composition is optimized for high mechanical strength and low fogging, then performance at high temperatures is improved, but deflection temperature under load must be maintained at high levels
Solution Approach 1:
The patent achieves high deflection temperature (≥190°C) by optimizing the polyamide composition parameters, specifically using diamines with 4-18 carbon atoms and aromatic dicarboxylic acids in controlled ratios. This parameter optimization ensures both high-temperature performance stability and adequate deflection temperature for engineering applications.
3Strength
If fibrous reinforcing agents and fillers are added to polyamide, then mechanical properties and weight reduction are achieved, but the composition complexity increases
Solution Approach 1:
The patent manages composition complexity by using a standardized composite formulation: polyamide (45-75 wt%) combined with non-sized fillers (10-40 wt%) and fibrous reinforcing agents (5-20 wt%). This structured composite approach achieves weight reduction and improved mechanical properties while maintaining manageable composition complexity through defined component ranges and ratios.
Data Source
AI summary
The present invention refers to a polyamide moulding composition consisting of the following components: a) 45 to 75% by weight of at least one partially crystalline polyamide consisting of at least one diamine and at least one aromatic dicarboxylic acid, whereupon the at least one diamine has 4 to 18 carbon atoms and is selected from a group of diamines consisting of linear aliphatic diamines, branched aliphatic diamines and cycloaliphatic diamines, b) 5 to 20% by weight of at least one fibrous reinforcing agent, c) 10 to 40% by weight of at least one non-sized filler which is different from the fibrous reinforcing agent in b), d) 0 to 10% by weight of a at least one additive, with the proviso that the component b) and c) add up to 25 to 45% by weight and the entirety of components a) to d) add up to 100% by weight. Moreover, the present invention refers to a moulded article producible from this moulding composition.