Additive manufacturing using thermotropic liquid crystalline polymer
A technology of additive manufacturing and thermotropic liquid crystals, applied in the field of additive manufacturing, can solve the problems of poor mechanical properties of pure TLCP boards
Active Publication Date: 2021-01-29
ETH ZZURICH
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Problems solved by technology
Although pure TLCP targets fabricated in this way are easy to recycle, however, the mechanical properties of pure TLCP sheets obtained by FDM are inferior to injection-molded sheets of pure TLCP or spun-drawn TLCP filaments.
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Embodiment
[0049] FDM Filament Manufacturing
[0050] Liquid crystal polymers commercially available from Ticona GmbH of Germany A950 (LCP) was dried at 150°C for 12 hours before extrusion. Using a single screw extruder ( E20 T, Collin, Germany) to produce LCP filaments, the single screw extruder was heated to 280°C, 290°C, 290°C and 260°C at four zones along its longitudinal axis. Extrude long filament with 60rpm and put it in water bath ( WB850, Collin, Germany) after cooling and collected on the modified flat film production line ( CR72T, Collin, Germany). The speed of the collector roll was adjusted to achieve a filament diameter of 1.75 mm. The filaments were wound on FDM mandrels and dried at 70 °C for at least 24 h before use.
[0051] FDM print settings
[0052] A commercially available fused deposition modeling (FDM) printer (Ultimaker 2+, Ultimaker, The Netherlands) was retrofitted with a geared direct-drive extruder and an all-metal V6 hotend (E3D, UK) to achiev...
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Abstract
An additive manufacturing process for the manufacture of an object in an additive manufacturing apparatus, wherein the object is formed by one or several individual solid filamentous units, said additive manufacturing process comprises the steps of, - discharging a polymer composition in a molten state from a nozzle of a print head, thereby imparting an orienting flow on the polymer composition ina molten state being discharged from the nozzle of the print head and depositing said discharged polymer composition in a molten state along at least one predefined, preferably horizontal, path and allowing the thus formed one or several filamentous units to solidify such as to form one or several solid filamentous units of the object to be manufactured; - optionally repeating the previous step until the object is formed; wherein said polymer composition comprises a thermotropic liquid crystal polymer as a polymer component of the polymer composition and the solid filamentous units are characterized in that the smallest thickness of the one or several filamentous units is equal or less than 0.2 mm, preferably to 0.15 mm and more preferably to 0.10 mm and most preferably is between 0.1 and0.01 mm.
Description
technical field [0001] The present invention relates to an additive manufacturing method for manufacturing a three-dimensional object using a thermotropic liquid crystal polymer or a composition thereof, in particular to fused deposition modeling (fused deposition modeling, FDM) or fused filament fabrication (fused filament fabrication, FFF). Background technique [0002] Structural materials that combine low weight with high mechanical properties are critical for making fuel-efficient vehicles, biomedical implants, and energy-harvesting structures. The increasing use of fiber-reinforced polymers as lightweight composites in aircraft, automobiles and wind turbines strongly relies on the production of stiff and strong fibers that must be successfully bonded to the polymer matrix. High stiffness and strength are typically achieved using inherently strong fiber materials such as quartz glass or polymers with a high degree of molecular orientation such as high-performance polyet...
Claims
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IPC IPC(8): B29C64/106B29C64/118B29C71/02B33Y10/00B33Y30/00B33Y80/00B29C64/209
CPCB33Y10/00B33Y30/00B33Y80/00B29C64/106B29C64/118B29C64/209B29C2071/022B29C64/295B29C70/06B29K2067/00B33Y70/00B33Y40/20B29C71/02
Inventor 西尔万·甘滕拜因库纳尔·马萨尼亚西奥·特沃特安德烈·斯图达特延斯·塞塞格威廉·沃伊格克
Owner ETH ZZURICH