Sulfonate-Modified Thermoplastic Powder for 3D Printing
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Solution Overview
Problem
Thermoplastic polymer powders used in 3D sintering processes, such as Selective Laser Sintering (SLS) and Multi-Jet Fusion (MJF), face issues with thermo-oxidative degradation when exposed to air, leading to undesirable yellowing and reduced recyclability due to inadequate antioxidant performance.
Innovation Solution
Incorporating an aliphatic or aromatic sulfonate, such as sodium hexanesulfonate or dodecylbenzene sulfonate, into the thermoplastic polymer powder, along with optional thioethers, fillers, or reinforcements, to enhance thermal stability and recyclability while maintaining mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If sintering process is conducted under air at high temperature, then productivity is improved, but thermo-oxidative degradation occurs causing yellowing and reduced recyclability
Solution Approach 1:
A sulfonate compound is introduced as an intermediary substance between the thermoplastic polymer and oxygen in the air atmosphere. The sulfonate acts as a mediator that prevents direct oxidative degradation of the polymer while allowing the sintering process to proceed under air at high temperature, thus resolving the contradiction between productivity and thermal stability
Solution Approach 2:
The invention converts the harmful effect of oxygen presence during sintering into a beneficial outcome by using sulfonate compounds that facilitate controlled oxidation protection. The sulfonate transforms the potentially damaging oxidative environment into a controlled process that maintains polymer stability while enabling high-temperature sintering under air
2Object-affected harmful factors
If conventional antioxidants are used, then some protection against yellowing is achieved, but thermal stability and recyclability are insufficient
Solution Approach 1:
The invention changes the chemical parameters of the antioxidant system by selecting sulfonate compounds with specific molecular structures (containing sulfur and oxygen atoms in particular arrangements). This parameter change in the antioxidant chemistry provides superior thermal stability and yellowing prevention compared to conventional antioxidants, enabling reliable recyclability
Solution Approach 2:
The invention creates a composite antioxidant system where sulfonate compounds work synergistically with the thermoplastic polymer matrix. The sulfonate-polymer composite provides enhanced thermal stability and protection against yellowing that neither component could achieve alone, improving overall reliability and recyclability
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 use of sulfonates significantly reduces yellowing and increases recyclability of the polymer powder and printed parts, even under harsh conditions, while preserving mechanical integrity, allowing for efficient reuse and improved thermal stability.
Implementation Method 1
the presence of oxygen at a high temperature may bring about thermo-oxidative degradation of the polymer, causing undesirable yellowing of the powder
Implementation Method 2
The principle is generally based on the agglomeration of powders, layer by layer, by melting said layer (hereinafter 'sintering') brought about by electromagnetic radiation, for example, a laser beam (laser sintering), infrared radiation
Implementation Method 3
melting said layer (hereinafter 'sintering') brought about by electromagnetic radiation
Data Source
AI summary
The present invention relates to a polymer powder for the manufacture of articles by 3D printing, particularly by sintering, comprising a thermoplastic polymer and a particular antioxidant having improved stability and recyclability. The invention also relates to a process for preparing this powder and to the use thereof in a process for manufacturing by sintering, and to the articles manufactured from said powder.