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Completely-biodegradable high-roundness 3D printing filament and preparation method thereof

A 3D printing and biodegradable technology, applied in the manufacture of rayon, single-component polyester rayon, fiber chemical characteristics, etc., can solve the problems of poor roundness of 3D printing filaments, different shrinkage rates, broken filaments, etc.

Active Publication Date: 2016-03-23
HANGZHOU SEEMORE NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

We know that when any two plastics are blended, due to the difference in molecular structure, the shrinkage rate is different. Therefore, the roundness of the 3D printing filament extruded from the blended material will become poor, which will lead to blockage during the 3D printing process. A series of problems such as head and broken wire

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 89% PLLA (melting point 160°C, melting index 15), 5% glass microspheres (solid, 3000 mesh), 1% PDLA powder (melting point 170°C, melting index 15, 300 mesh), 5% PLA-PGA block After mixing the copolymer (melt index 20) evenly, add it to a twin-screw extruder, extrude and granulate at 160-180°C to obtain a 3D printing filament material with a tensile strength of 75MPa and a notched impact strength of 10KJ / m 2 , heat distortion temperature 95°C;

[0022] Put the material obtained in the above steps into a wire drawing machine, extrude and draw wire at 170-190°C, the temperature of the water bath is 40°C, the diameter of the wire is 1.5mm, and the roundness is ±0.002mm.

Embodiment 2

[0024] 80% PLLA (melting point 165°C, melting index 12), 12% glass microspheres (solid, 4000 mesh), 3% PDLA powder (melting point 170°C, melting index 6.5, 400 mesh), 8% PLA-PGA block After the copolymer (melt index 10) is mixed evenly, it is added to the twin-screw extruder, extruded and granulated at 160-180°C to obtain a 3D printing filament material with a tensile strength of 68MPa and a notched impact strength of 12KJ / m 2 , heat distortion temperature 108°C;

[0025] Put the material obtained in the above steps into a wire drawing machine, extrude and draw wire at 170-190°C, the temperature of the water bath is 50°C, the diameter of the wire is 3.0mm, and the roundness is ±0.003mm.

Embodiment 3

[0027] 60% PLLA (melting point 170°C, melting index 5.7), 20% glass microspheres (hollow, 5000 mesh), 5% PDLA powder (melting point 160°C, melting index 4.5, 500 mesh), 15% PLA-PGA block After the copolymer (melt index 15) is mixed evenly, it is added to a twin-screw extruder, extruded and granulated at 160-180°C to obtain a 3D printing filament material with a tensile strength of 79MPa and a notched impact strength of 15KJ / m 2 , heat distortion temperature 135°C;

[0028] Put the material obtained in the above steps into a wire drawing machine, extrude and draw wire at 170-190°C, the temperature of the water bath is 60°C, the diameter of the wire is 1.75mm, and the roundness is ±0.001mm.

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Abstract

The invention relates to a completely-biodegradable high-roundness 3D printing filament and a preparation method thereof. The 3D printing filament is composed of 60-89% of poly-L-lactic acid (PLLA), 5-20% of glass microspheres, 1-5% of poly-D-lactic acid (PDLA) and 5-15% of a PLA-PGA segmented copolymer. The 3D printing filament is prepared through extrusion at 170-190 DEG C in a drawing machine and then water-bath cooling and shaping at 40-60 DEG C. The 3D printing filament is good in roundness, high in strength, quick to crystallize, good in temperature resistance and good in toughness, and is suitable for 3D printing in various types.

Description

technical field [0001] The invention relates to a completely biodegradable high-roundness 3D printing filament and a preparation method thereof. Background technique [0002] The idea of ​​3D printing originated in the United States at the end of the 19th century and was developed and promoted in the 1980s. It is a rapid prototyping technology, which is a technology based on digital model files, using adhesive materials such as plastics and powdered metals, to construct objects by layer-by-layer printing. [0003] There are many ways to realize 3D printing, and the most mature one at present is the technology of "fusion deposition molding" (FDM). The whole process is to melt plastic in the nozzle, and then form a thin layer by depositing plastic fibers. Commonly used 3D printing resin materials include acrylonitrile-butadiene-styrene copolymer (ABS), nylon (PA), polylactic acid (PLA), etc. [0004] As a green substitute for ordinary plastics, biodegradable plastics can fun...

Claims

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Application Information

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IPC IPC(8): D01F6/92D01F1/10
CPCD01F1/10D01F6/92
Inventor 马学所
Owner HANGZHOU SEEMORE NEW MATERIAL TECH
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