Polymer Powder Spheroidization Using Ionic Liquids for 3D Printing
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Solution Overview
Problem
Existing methods struggle to spheroidize polymer powders with high melting or softening points, such as polyether ketone ketone, using polyethylene glycol as a dispersion medium due to insufficient heating capabilities.
Innovation Solution
Utilizing ionic liquids, specifically [BMIM][BF4], to disperse polymer powders, followed by energy exposure and reprocessing steps to achieve spheroidization, including segregation agents and energy types like microwave energy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If polyethylene glycol is used as dispersion medium for spheroidization, then low melting point polymers can be spheroidized, but high melting point polymers cannot be heated to sufficient temperatures
Solution Approach 1:
The patent changes the fundamental parameter of the dispersion medium from polyethylene glycol (limiting to 100°C) to ionic liquids (stable up to 400°C+), enabling temperature parameter adjustment to match high melting point polymer requirements while maintaining spheroidization capability across diverse polymer types
Solution Approach 2:
The patent introduces ionic liquids as an intermediary substance that mediates between the heating process and high melting point polymers, allowing efficient heat transfer to polymers that cannot be directly heated by conventional dispersion media like polyethylene glycol
2Manufacturing precision
If conventional spheroidization methods are used, then process simplicity is maintained, but spheroidization effectiveness for high melting point polymers is insufficient
Solution Approach 1:
The patent employs ionic liquids as a mediating substance that enables effective spheroidization of high melting point polymers through enhanced heat transfer and sustained high-temperature exposure, achieving manufacturing precision comparable to or exceeding conventional methods while managing increased process complexity through the unique properties of ionic liquids
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 method effectively produces spheroidized polymer powder particles with high sphericity, suitable for 3D printing processes like powder bed fusion and vat photopolymerization, overcoming the limitations of previous methods.
Implementation Method 1
the polymer powder particles are added to ionic liquids obtaining a polymer dispersion
Implementation Method 2
energy is exposed to the polymer dispersion... energy types like microwave energy
Implementation Method 3
subjected to microwave heating to realize rapid spheroidization
Implementation Method 4
selective melting and solidification... regions melted layer by layer beforehand
Implementation Method 5
After cooling and solidification of the regions melted layer by layer beforehand
Data Source
Figure 1~2
Figure 3~5
AI summary
The present invention relates to a method for spheroidizing polymer powder particles, especially for use in a powder bed fusion method, comprising the sequentially steps A) adding polymer powder particles to ionic liquids obtaining a polymer dispersion, B) exposure of energy to the polymer dispersion, and C) reprocessing of the polymer dispersion to obtain spheroidized polymer powder particles. The invention also relates to polymer powder particles obtainable by said method, to the use thereof, and to shaped bodies produced using the powder.