Nylon Copolymer Powder for Laser Sintering Temperature Window
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Solution Overview
Problem
Most polymers lack a suitable processing window between melt and crystallization onset temperatures, making them unsuitable for laser sintering, a 3D printing technique that requires a specific temperature range for effective polymer powder processing.
Innovation Solution
Development of a polymer powder composition comprising nylon copolymers with specific aromatic and aliphatic components, such as isophthalic and terephthalic acids, and unreacted cyclic monomers, which provide a broader temperature window suitable for laser sintering, allowing for enhanced thermal stability and recyclability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional polymers are used for laser sintering, then the processing is straightforward, but the polymers lack a suitable temperature window between melt and crystallization onset, making them unsuitable for laser sintering
Solution Approach 1:
The patent modifies the polymer's thermal parameters by copolymerizing nylon 6 or nylon 12 with aromatic diacids (isophthalic acid and/or terephthalic acid). This chemical modification changes the crystallization and melting behavior of the polymer, creating a sufficient temperature window between crystallization onset and melting onset temperatures, thereby enabling laser sintering processing
Solution Approach 2:
The invention creates a copolymer composite material combining aliphatic nylon components (nylon 6 or nylon 12) with aromatic components (isophthalic acid and/or terephthalic acid). This composite structure at the molecular level provides both the thermal stability needed for laser sintering and the necessary processing temperature window
2Temperature
If nylon copolymers with aromatic components are synthesized, then a suitable processing window is achieved, but the complexity of polymer synthesis increases
Solution Approach 1:
The patent controls the composition parameters of the copolymer by varying the molar ratios of isophthalic acid and terephthalic acid (typically 1:4 to 4:1 ratios). This parameter optimization achieves the desired balance between processing window and synthesis feasibility, using commercially available monomers and standard polycondensation processes
3Productivity
If the polymer powder bed is kept at temperature between melt and crystallization temperatures, then fast processing with good surface quality is achieved, but most polymers cannot maintain this temperature range due to overlapping transitions
Solution Approach 1:
The copolymerization with aromatic diacids fundamentally changes the thermal transition parameters of the nylon, separating the crystallization onset temperature from the melting onset temperature by a sufficient margin. This creates a stable thermal processing window where the powder bed can be maintained at optimal temperature for fast laser sintering with excellent surface quality
Solution Approach 2:
The molecular-level composite structure of aliphatic and aromatic segments in the copolymer chain provides enhanced thermal stability. The aromatic segments act as structural reinforcements that raise crystallization temperature and broaden the processing window, while the aliphatic segments maintain processability
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 polymer powder composition achieves improved mechanical strength, chemical resistance, and recyclability, enabling the production of parts with comparable or superior strength profiles to injection-molded parts, while allowing for customization and additive incorporation without compromising thermal stability.
Implementation Method 1
a high powered laser to melt and fuse particles
Implementation Method 2
Laser sintering is an additive manufacturing or 3D printing method which builds parts layer by layer using a high powered laser to melt and fuse particles
Implementation Method 3
the sintered parts are removed from the bed of unfused polymer powder after the polymer bed is cooled
Data Source
AI summary
Powder compositions for laser sintering. Nylon copolymer compositions are described which provide enhanced performance in processing and finished products when used in 3D laser sintering processes.