Thermoplastic Polyamide Powder for 3D Printing
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Solution Overview
Problem
Current powder bed fusion technologies face challenges in achieving high mechanical performance, printability, recyclability, and stability of 3D printed parts, particularly in terms of minimizing cracks, warpage, curling, and ensuring smooth surfaces, while also allowing for color mixing and subsequent coloring without bleeding.
Innovation Solution
A thermoplastic polyamide powder with aliphatic dicarboxylic acid building blocks of 16-22 carbon atoms is used, which can be mixed with other materials to enhance mechanical properties and printability, and can be recycled, allowing for stable mechanical properties and higher translucency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If common polymer powders (PA 11, PA 12, PA 6) are used in powder bed fusion processes, then the process is well-established and easy to operate, but the mechanical performance and stability of printed parts are insufficient
Solution Approach 1:
The patent modifies the chemical composition parameters of polyamide powders by incorporating specific comonomers (cyclic carbonates, cyclic carboxonates, cyclic carbonic acid esters) with controlled amounts (0.1-20 mol%). This changes the molecular structure and thermal properties of the polymer, resulting in improved mechanical performance and dimensional stability while maintaining printability
Solution Approach 2:
The patent creates composite polyamide systems by combining base polyamide polymers with specific comonomer units that have different chemical properties. This composite approach allows the material to exhibit both the processability of common polyamides and the enhanced mechanical properties needed for high-performance applications
2Strength
If laser sintering parameters are increased to improve mechanical properties, then strength increases, but defects like cracks, warpage, and curling worsen
Solution Approach 1:
The patent modifies the material's thermal parameters (melting point, crystallization behavior) through comonomer incorporation, allowing optimization of laser sintering parameters. The modified polyamides exhibit broader processing windows and reduced thermal shrinkage, enabling high mechanical properties to be achieved without excessive warpage or cracking
Solution Approach 2:
The patent addresses the inherent problem of rapid cooling causing cracks and warpage by incorporating comonomers that modify crystallization kinetics. The modified materials exhibit more controlled phase transformation behavior, converting the potentially harmful rapid solidification into a controlled process that maintains dimensional stability while achieving high strength
3Productivity
If powder recycling is implemented to improve sustainability, then material utilization increases, but printability and mechanical performance deteriorate
Solution Approach 1:
The patent modifies powder properties through comonomer incorporation to enhance flowability and sintering characteristics. These parameter changes ensure that even after multiple recycling cycles, the modified powders maintain consistent printability and mechanical properties, unlike conventional polyamides that degrade with recycling
Solution Approach 2:
The patent enables continuous recycling and reuse of powder material while maintaining consistent quality. The modified polyamide composition preserves its functional properties through multiple cycles, allowing the process to continue with recycled material without degradation in printability or part quality
4Manufacturing precision
If surface smoothness is improved by optimizing sintering parameters, then surface finish quality increases, but translucency and color mixing capabilities are reduced
Solution Approach 1:
The patent modifies the optical and surface properties of polyamide powders through comonomer incorporation. The modified materials exhibit altered surface tension, melting behavior, and crystallization characteristics that enable simultaneous achievement of smooth surfaces and controlled translucency, as well as improved color mixing properties
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 solution results in 3D printed parts with improved mechanical properties, reduced defects like cracks and warpage, and increased recyclability, while maintaining stability and enabling effective color mixing and coloring, with enhanced surface smoothness and translucency.
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
areas of each powder layer are selectively melted by introducing electromagnetic energy
Implementation Method 3
causes this solidification by melting the material
Implementation Method 4
the melt solidifies when it falls below the solidification temperature of the polymer
Implementation Method 5
the released heat of solidification keeps the moulded body inside at exactly at the solidification temperature until the phase transformation is completed
Data Source
AI summary
Use of a powder in a in a layer-by-layer process in which areas of a powdered layer are selectively melted, sintered, fused, or solidified, preferably by focused or non-focused input of electromagnetic energy, wherein the powder comprises or consists of a thermoplastic polyamide powder comprising aliphatic dicarboxylic acid building blocks with 16-22 carbon atoms.