Copolyamide Powder for Selective Laser Sintering
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Solution Overview
Problem
Current powder bed fusion technologies face limitations in achieving a wide range of mechanical and physical properties similar to conventional PP and PA11 systems, particularly in reducing operating temperatures, increasing recyclability, and maintaining impact strength, while also being cost-effective and allowing for dry color mixing without bleeding.
Innovation Solution
A copolyamide powder composed of laurolactam and caprolactam with specific end group concentrations and a grinding process to achieve suitable particle size distribution, enabling selective melting and sintering with reduced shrinkage and enhanced additivity, including the possibility of adding flame retardants without compromising properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional polymer powders (PA11, PA12, PP) are used for selective laser sintering, then the process can be performed with established materials, but the mechanical and physical properties cannot match the wide range of conventional PP and PA11 systems
Solution Approach 1:
The patent uses copolymer systems combining different polyamide components (PA6, PA12, PA1010) with specific ratios to achieve tailored mechanical and physical properties. The composite nature of the copolymer allows accessing a wide property range similar to conventional materials while maintaining consistent performance through controlled composition.
2Temperature
If conventional polyamide powders are used, then the material has established properties, but the operating temperatures cannot be reduced
Solution Approach 1:
The patent modifies the chemical composition parameters of the polyamide by incorporating different lactam units (epsilon-caprolactam, laurolactam, decalactam) in specific ratios. This changes the material's thermal properties to enable lower operating temperatures while maintaining impact strength through the synergistic effect of the copolymer structure.
3Loss of substance
If conventional powders are used for selective laser sintering, then the process is straightforward, but recyclability cannot be increased
Solution Approach 1:
The patent enables powder recycling by designing a copolymer system that maintains its sintering properties after multiple use cycles. The specific copolymer composition allows for recovery and reuse of unsintered powder while maintaining manufacturing quality, reducing material loss without significantly increasing process complexity.
4Ease of manufacture
If conventional polyamide powders are used, then the material has standard properties, but color mixing causes bleeding issues
Solution Approach 1:
The patent enables dry color mixing by creating a copolymer system where colorants can be locally distributed within the powder particles without causing bleeding during sintering. The specific copolymer structure provides localized stability that prevents color migration while allowing mixed-color formulations.
5Object-affected harmful factors
If flame retardants are added to conventional powders, then fire safety is improved, but material properties are compromised
Solution Approach 1:
The patent extracts the harmful effect of flame retardant degradation on mechanical properties by using a copolymer base that inherently provides better thermal stability. This allows flame retardant addition for fire safety while the copolymer structure prevents the property compromise that occurs with conventional homopolymers.
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 copolyamide powder provides a broad range of mechanical properties, reduced production costs, increased recyclability, and the ability to print fully colored parts without color bleeding, while maintaining impact strength and allowing for the addition of flame retardants, thus improving the additive manufacturing process.
Implementation Method 1
selective irradiation from above with a laser, which irradiates only the areas to be solidified and causes this solidification by melting the material
Implementation Method 2
input of electromagnetic energy (typically by a controlled laser)
Implementation Method 3
areas of a powdered layer are selectively melted
Implementation Method 4
the melt solidifies when it falls below the solidification temperature of the polymer
Implementation Method 5
the block is slowly cooled, and the melt solidifies
Implementation Method 6
polymerization of at least one majority monomer with at least one different minority comonomer
Implementation Method 7
reduction of the crystallization temperature and the melting temperature
Data Source
AI summary
Powder for the production of mouldings in a layer-by-layer process in which areas of a powdered layer are selectively melted, sintered, fused, or solidified, wherein the powder is a thermoplastic polyamide powder in which the polyamide consists of laurolactam and caprolactam, wherein the molar proportion of caprolactam is greater than 61% of the lactams used.