Thermoplastic Polymer Colouring With Aluminium–Silicon Limits
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Solution Overview
Problem
Existing coloured thermoplastic polymers, particularly those using monoazo dyes with heteroaromatic moieties, suffer from insufficient thermal stability, leading to the formation of undesired dark particles during processing at elevated temperatures and shearing forces, which affects optical properties and colour uniformity.
Innovation Solution
A process for manufacturing coloured moulding compositions by using colouring preparations with limited aluminium and silicon content (less than 100 ppm and 300 ppm, respectively) to prevent the formation of insoluble chemical complexes, ensuring complete dissolution and uniform distribution of monoazo dyes, thereby maintaining thermal stability and optical clarity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If monoazo dyes with heteroaromatic moieties are used for colouring thermoplastic polymers, then colour brightness and weathering stability are improved, but thermal stability deteriorates leading to formation of dark particles during processing
Solution Approach 1:
The invention changes the chemical composition parameters of the colouring preparation by strictly limiting the content of aluminium compounds (<100 ppm) and silicon compounds (<300 ppm). This parameter change prevents the formation of insoluble chemical complexes between the monoazo dye and these compounds, thereby maintaining thermal stability while preserving colour brightness and weathering stability.
Solution Approach 2:
The invention extracts and removes the harmful components (aluminium and silicon compounds) from the colouring preparation formulation. By taking out these problematic substances that cause dark particle formation, the invention allows the monoazo dye to maintain its thermal stability without forming insoluble complexes during processing.
2Ease of manufacture
If colouring preparations with conventional aluminium and silicon content are used, then ease of manufacture is improved, but formation of dark particles occurs during processing at elevated temperatures
Solution Approach 1:
The invention implements specific parameter changes in the colouring preparation composition by defining maximum limits for aluminium compounds (<100 ppm) and silicon compounds (<300 ppm). These parameter adjustments eliminate the harmful effect of dark particle formation while maintaining ease of manufacture through straightforward compositional control.
3Illumination intensity
If monoazo dyes are used to achieve uniform colour distribution, then optical appearance is improved, but thermal stability deteriorates under increased temperatures and shearing forces
Solution Approach 1:
The invention changes the chemical composition parameters by limiting aluminium and silicon content, which prevents thermal degradation of the monoazo dye during processing. This allows the dye to maintain uniform distribution and excellent optical appearance (low haze) while achieving high thermal stability under elevated temperatures and shearing forces.
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 process results in coloured moulding compositions with high thermal stability and low haze, free from undesired dark particles, even under increased temperatures and shearing forces, maintaining excellent optical properties.
Implementation Method 1
adding to the thermoplastic polymer from step a) a colouring preparation or an liquid composition or a masterbatch comprising said colouring preparation, wherein the colouring preparation comprises a monoazo dye comprising at least one heteroaromatic moiety
Implementation Method 2
using colouring preparations with limited aluminium and silicon content (less than 100 ppm and 300 ppm, respectively) to prevent the formation of insoluble chemical complexes
Data Source
AI summary
A process can be used for manufacturing a coloured moulding composition with an improved optical appearance and a particularly high thermal stability. The process involves providing a thermoplastic polymer and adding a colouring preparation, or a liquid composition or a master batch containing the colouring preparation. Injection moulded parts and extruded parts can be composed of the coloured moulding composition.