A Fused Deposition Modeling 3D Printing Method for PVDF with High β Crystal Content

A technology of fused deposition modeling and 3D printing, applied in 3D object support structures, coating devices, manufacturing tools, etc., can solve the problems of inability to realize complex three-dimensional structure construction, no electrical activity, poor molding quality, etc., and achieve low cost , Piezoelectric conversion performance improvement, and the effect of improving the dimensional stability of the workpiece

Active Publication Date: 2021-09-21
SICHUAN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, FDM 3D printing high β crystal PVDF technology has the following problems: (1) During the printing process, due to the need to increase the temperature to exceed the melting point of PVDF, more stable α crystals are easy to be produced after printing and cooling, and there is no electrical activity; therefore, auxiliary polarization means are needed If a high electric field is applied to obtain PVDF with a high β-crystal content, the process is complicated, and the β-crystal content is only 56%, which cannot meet the industrial polar phase (β or γ) content of 80% for PVDF piezoelectric devices. The above requirements; (2) PVDF is a semi-crystalline polymer with large shrinkage and poor molding quality during FDM printing; (3) The current FDM 3D printing process can only achieve single-layer PVDF parts containing polar phases. Unable to realize the construction of complex three-dimensional structures

Method used

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  • A Fused Deposition Modeling 3D Printing Method for PVDF with High β Crystal Content
  • A Fused Deposition Modeling 3D Printing Method for PVDF with High β Crystal Content
  • A Fused Deposition Modeling 3D Printing Method for PVDF with High β Crystal Content

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Embodiment 1

[0037] A preferred embodiment of the present invention provides a fused deposition modeling 3D printing method for PVDF with high β-crystal content, the specific steps are as follows:

[0038] First, 1-ethyl-3-methylimidazolium tetrafluoroborate is evenly dispersed in 250ml of N,N-dimethylformamide (DMF) solvent, and then poured into 100g of PVDF particles, keeping the temperature at 60°C , rotating at 520r / min, stirring for 4 hours until PVDF is completely dissolved in DMF solvent, then baked at 70°C until the solvent is completely removed; then cut into small particles, extruded through a single-screw extruder to obtain filaments, extruder The rotation speed is 22rpm, the temperature is 200°C, and the filament diameter is 1.75mm. During the extrusion process, an adjustable-speed tractor is used for traction and a measuring instrument is used to measure the filament diameter in real time. Finally, the filament is placed into the FDM 3D printer and passed through the printing n...

Embodiment 2

[0040] A preferred embodiment of the present invention provides a fused deposition modeling 3D printing method for PVDF with high β-crystal content, the specific steps are as follows:

[0041] First, evenly disperse 1-methylimidazole nitrate in 250ml of dimethylacetamide (DMAc) solvent, then pour 100g of PVDF particles, keep the temperature at 60°C, rotate at 520r / min, stir for 4h, until the PVDF is completely Dissolve in DMAc solvent, then bake at 75°C until the solvent is completely removed; then cut into small particles, extrude through a single-screw extruder to obtain filaments, the extruder speed is 20rpm, the temperature is 220°C, and the diameter of the filaments is 1.75 mm, during the extrusion process, an adjustable-speed haul-off machine is used for traction and a measuring instrument is used to measure the diameter of the filament in real time. Finally, the filament is placed in the FDM 3D printer and extruded through the printing nozzle according to the preset mode...

Embodiment 3

[0043] A preferred embodiment of the present invention provides a fused deposition modeling 3D printing method for PVDF with high β-crystal content, the specific steps are as follows:

[0044] Firstly, 1-ethyl-3-methylimidazolium diethyl phosphate salt is evenly dispersed in 250ml of dimethyl sulfoxide (DMSO) solvent, and then poured into 100g of PVDF particles, keeping the temperature at 60°C and rotating speed of 520r / min, stirred for 4 hours, until PVDF was completely dissolved in the DMF solvent, and then baked at 65°C until the solvent was completely removed; then cut into small particles, extruded through a single-screw extruder to obtain filaments, the speed of the extruder was 25rpm, and the material The temperature is 240°C and the diameter of the filament is 1.75mm. During the extrusion process, an adjustable-speed tractor is used for traction and the measuring instrument is used to measure the diameter of the filament in real time. Finally, the filament is placed in...

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Abstract

The invention discloses a fused deposition molding 3D printing method for PVDF with high β-crystal content, comprising the following steps: first uniformly mixing PVDF and a modifier, then granulating, forming filaments through melt extrusion, and making the filaments Put it into an FDM 3D printer and print it to make a product. The present invention selects a modifier suitable for high-temperature melting conditions, improves the melting processability of PVDF raw materials, the β crystals in PVDF, and endows PVDF materials with excellent piezoelectric conversion properties. The products prepared by the method of the present invention can be used as mechanical energy Collect devices, sensors, drivers, etc. for use in new energy harvesting, sensing, artificial intelligence, and other fields.

Description

technical field [0001] The invention belongs to the technical field of 3D printing material modification, and in particular relates to a fused deposition modeling 3D printing method of PVDF with high β-crystal content. Background technique [0002] As an emerging rapid additive manufacturing technology, 3D printing technology is favored for its low cost, high efficiency, flexible design, and the ability to realize extremely complex structures. Among the existing 3D printing technologies, such as fused deposition modeling (FDM), direct ink writing, selective laser sintering, etc., FDM is the most mature 3D printing technology that basically realizes commercial application. FDM 3D printing technology uses moving nozzles The thermoplastic polymer is melted and deposited layer by layer in the designed structural model. The polymer comes out of the hot nozzle in a semi-molten form, and is cooled and solidified on the heating plate, layered into a product, the heating plate reduc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C64/118B29C64/393B29C48/92B29C64/209B29C64/321B33Y10/00B33Y40/00B33Y50/02B33Y70/00C08L27/16C08K5/3445C08K5/19
CPCB33Y10/00B33Y40/00B33Y50/02B33Y70/00B29C64/118B29C64/209B29C64/321B29C64/393B29C48/92B29C2948/9258B29C2948/92704C08K5/19C08K5/3445C08L27/16
Inventor 张楚虹刘新刚尚颖皓
Owner SICHUAN UNIV
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