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3D printers and photocurable polymer and resin based feedstocks for 3D printers

a 3d printer and resin-based technology, applied in the direction of additive manufacturing processes, manufacturing tools, transportation and packaging, etc., can solve the problems of difficult or impossible to manufacture highly customized complex parts and products using traditional technologies, poorly suited to high-volume, low-cost production, etc., to facilitate the dispersion of carbon compounds

Inactive Publication Date: 2019-01-31
VOXELUM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patent is about using carbon-containing photocurable formulations to create electrically conducting 3D polymer objects. Adding carbon to the formulation can make the object highly electrically conductive and improve its mechanical, thermal, and other properties. For example, carbon-containing polymer composites can have stronger tensile strength and be less flammable compared to pure polymer objects.

Problems solved by technology

This technology can create highly customized complex parts and products that are difficult or impossible to manufacture using traditional technologies.
These two methods operate in a batch mode and may therefore be poorly suited to high-volume, low cost production.

Method used

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  • 3D printers and photocurable polymer and resin based feedstocks for 3D printers
  • 3D printers and photocurable polymer and resin based feedstocks for 3D printers
  • 3D printers and photocurable polymer and resin based feedstocks for 3D printers

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0074]As-synthesized multi-wall CNT material (comprising about 85 wt % inorganic impurities) was refluxed in excess amount of about 1M HCl for about 5 hours, and then filtered to remove the main volume of the acid while keeping the CNT material wet. The purified product (comprising about 2 wt % inorganic impurities) was washed two times with de-ionized water to remove the residual acid, and then separated into three parts for the experiments described in other Examples. The first part was dried in a convection oven at about 120° C. for about 4 hours. The second part was kept wet and refluxed in water (at CNT concentration of about 2 g / L) for about 5 hours to loosen up the CNTs. The third part was washed with copious amounts of toluene three times thereby substantially replacing the water with toluene as a solvent and bringing the CNT concentration to about 2 g / L. Then, the CNT-toluene suspension was refluxed for about 5 hours. Finally, both these CNT suspensions (one in water and on...

example 2

[0075]Dried powder of purified multi-wall CNT material prepared in Example 1 as the first part was dispersed following exactly the same process as the other two parts. To produce a stable CNT suspension, the dry powder was first refluxed in water at CNT concentration of about 2 g / L for about 5 hours, then passed 2 times through the Microfluidizer. The G / D ratio for the multi-wall CNT dry powder material as measured with about 532 nm laser excitation may vary in the range of 1.1 to 1.4. After dispersing, the G / D ratio decreased to a level varying in the range of 0.4 to 0.8 indicating increased concentration of CNT defects.

[0076]The multi-wall CNT material may be provided, for example, by Thomas Swan & Co Ltd (UK), Nanocyl (Belgium), or many other suppliers. The step of Microfluidizer treatment may be combined or substituted with any high shear mixing, sonication, wet ball milling, another similar treatment, or a combination thereof. Similar simple and efficient process may be designe...

example 3

[0078]A typical procedure to produce electrically conducting 3D-printable photopolymer resin for use in SLA technology is described in this example.

[0079]The toluene suspension of non-agglomerated and / or non-damaged CNT prepared according to the process described in Example 1 may be added to a liquid acrylic resin in a desired proportion and agitated for about 5 hours at about 50° C. with a magnetic stirrer to ensure uniform distribution of CNT throughout the resin's volume. The liquid acrylic resin may be, in particular, MakerJuice SF resin, and the CNT suspension may be added at about 20 wt %. The CNT content in the resin should be high enough to ensure desired electrical conductivity, but also low enough to keep the viscosity below about 1,000 (millipascalsecond) at about 25° C. otherwise the resin will be difficult to 3D print. Other commercially available resins, different proportions of the CNT suspension, and different solvents may also be used. For example, aromatic solvents...

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Abstract

This disclosure relates in general to three dimensional (“3D”) printers having a configuration that prepares a three-dimensional object by using a feedstock comprising carbon containing photocurable formulations and methods for the preparation of such feedstocks. This disclosure further relates to electrically conducting 3D polymer composites prepared by using such carbon containing photocurable formulations.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is a divisional of U.S. application Ser. No. 15 / 515,955 filed Mar. 30, 2017 and entitled “3D PRINTERS AND FEEDSTOCKS FOR 3D PRINTERS” which is a United States national phase application under 35 U.S.C. 371 of International Application No. PCT / US2015 / 052530, entitled “3D Printers and Feedstocks for 3D Printers,” filed on Sep. 27, 2015, which is based upon and claims priority to the U.S. provisional patent application No. 62 / 059,947, entitled “Nanocarbon Composites for 3D Printing,” filed Oct. 5, 2014, and to the U.S. provisional patent application No. 62 / 184,867, entitled “Nanocarbon Composites for 3D Printing,” filed Jun. 26, 2015.BACKGROUNDTechnical Field[0002]This disclosure relates in general to three dimensional (“3D”) printers having a configuration that prepares a three-dimensional object by using a feedstock comprising a carbon containing photocurable polymer or resin formulation or compound. This disclosure also r...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B29C64/153B29C64/165B33Y70/00B33Y40/00B33Y10/00C22C26/00C22C1/10B22F3/105C22C32/00B22F3/00B22F1/02B29C71/04B29C64/268B29C64/00B22F1/16
CPCB29C64/165B33Y70/00B33Y40/00B33Y10/00C22C26/00C22C1/1084B22F3/1055C22C32/0084B22F3/008B22F1/02Y02P10/295B29C71/04B29C64/153B29C64/268B29C64/00B29C64/314Y02P10/25B22F1/16B22F10/18B22F10/25B22F10/28B22F10/12B33Y40/10B33Y70/10B22F10/00
Inventor GRIGORIAN, LEONID
Owner VOXELUM INC
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