Polyamide-12 Coated Glass Beads for 3D Printing Recyclability
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Solution Overview
Problem
The recyclability of unused powder in 3D printing is limited due to thermal degradation of polyamide-12 polymer, which affects the multiple part builds and efficiency of the process.
Innovation Solution
A material set comprising composite particles of glass beads coated with polyamide-12 polymer, where the polymer has a specific end group ratio and solution viscosity stability, combined with a fusing agent that absorbs electromagnetic radiation to produce heat, allowing for improved thermal stability and recyclability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polyamide-12 polymer is used as powder bed material, then the material can be fused to form 3D printed parts, but the polymer undergoes thermal degradation limiting recyclability
Solution Approach 1:
The patent modifies the chemical parameters of the polyamide-12 polymer by controlling the end group ratio (greater than 80 meq/g carboxylic end groups and less than 40 meq/g amino end groups) and solution viscosity stability. These parameter changes enhance the polymer's resistance to thermal degradation during repeated heating cycles, thereby improving recyclability while maintaining fusibility.
Solution Approach 2:
The patent uses composite particles consisting of glass beads coated with polyamide-12 polymer. This composite structure combines the thermal stability of glass beads with the fusibility of polyamide-12, creating a material that can withstand repeated heating cycles without significant degradation, thus improving both thermal stability and recyclability.
2Strength
If the polyamide-12 polymer is heated for fusing, then the layers bond together to form solid structure, but thermal degradation occurs limiting multiple part builds
Solution Approach 1:
By controlling the solution viscosity stability (changes no more than about 5% after 20 hours at 165°C) and end group composition, the patent ensures that the polymer maintains its bonding capability over multiple heating cycles. The modified parameters allow sufficient thermal energy absorption for strong layer bonding while resisting cumulative thermal degradation.
Solution Approach 2:
The patent extends the service life of the powder bed material by making it effectively reusable through multiple cycles. The controlled degradation resistance allows the same powder to be recycled and reused multiple times, replacing the traditional single-use or limited-use powder with a durable, multi-cycle material system.
3Manufacturing precision
If the polyamide-12 polymer has high reactivity for fusing, then the material bonds well, but thermal degradation increases reducing recyclability
Solution Approach 1:
The patent optimizes the chemical composition parameters, specifically the end group ratio and solution viscosity, to achieve a balance between reactivity and stability. The controlled end groups provide sufficient reactivity for effective fusing and bonding, while the stabilized viscosity prevents excessive thermal degradation, enabling both high manufacturing precision and improved 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 solution enhances the recyclability of the powder bed material by maintaining solution viscosity stability and improving the physical properties of the printed parts, such as strength and elongation, while allowing for multiple cycles of heating and cooling without significant degradation.
Implementation Method 1
a fusing agent comprising an energy absorber capable of absorbing electromagnetic radiation to produce heat
Implementation Method 2
The absorbed electromagnetic radiation can then be converted to thermal energy, causing the printed portions of the powder to melt and coalesce
Implementation Method 3
the composite particles may be preheated at from 110° C. to 140° C., and once on the platen base of the powder bed, the polyamide-12 polymer may be heated to from 140° C. to 220° C.
Implementation Method 4
causing the printed portions of the powder to melt and coalesce
Data Source
AI summary
The present disclosure is drawn to material sets for 3-dimensional printing, 3-dimensional printing systems, and 3-dimensional printed parts. A material set can include a powder bed material of composite particles including glass beads coated with polyamide-12 polymer. The composite particles can have an average particle size from 20 μm to 200 μm, and the polyamide-12 polymer can include greater than 80 meq/g carboxylic end groups and less than 40 meq/g amino end groups. The fusing agent can include an energy absorber capable of absorbing electromagnetic radiation to produce heat.