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Preparation method of conductive 3D printing graphene composite material with high mechanical strength

A 3D printing, mechanical strength technology, applied in graphene, additive processing, nano-carbon and other directions, can solve problems such as damage and poor conductivity of graphene composites, and achieve overcoming difficulties in dispersion, good industrialization prospects, and crystal lattices. full effect

Pending Publication Date: 2021-11-23
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can improve the dispersion of graphene and polymer, but the oxidation-reduction process will inevitably destroy the crystal structure of graphene, and the resulting graphene composite material has poor conductivity.

Method used

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  • Preparation method of conductive 3D printing graphene composite material with high mechanical strength
  • Preparation method of conductive 3D printing graphene composite material with high mechanical strength
  • Preparation method of conductive 3D printing graphene composite material with high mechanical strength

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Take a certain amount of ABS and graphite powder, first dissolve the ABS in the organic solvent N-methylpyrrolidone, and configure it into a certain concentration of ABS solution; then add graphite powder to it to obtain a raw material dispersion; raw material dispersion The mass ratio of graphite powder and ABS in the medium is 0.1:1; the concentration of ABS is 20g / L;

[0034] (2) Using the gas-driven liquid phase exfoliation method, the graphite in the raw material dispersion is exfoliated, the liquid phase flow rate is controlled to be 0.5L / h, the gas flow rate is 200L / h, the number of cycles is 10 times, the length of the exfoliation tube is 50cm, the inner diameter 2mm to obtain a dispersion containing ABS, graphene and graphite powder;

[0035] (3) Put the dispersion in step (2) into a centrifuge to remove unstripped graphite powder, set the speed at 500rpm for 60min; obtain the dispersion of graphene / ABS;

[0036] (4) Measure a certain volume of deionized w...

Embodiment 2

[0040] (1) Take a certain amount of PLA and graphite powder, first dissolve PLA in the organic solvent N-N dimethylamide, and configure it into a certain concentration of PLA solution; then add graphite powder to it to obtain a raw material dispersion; raw material dispersion The mass ratio of graphite powder and PLA in the medium is 0.3:1; the concentration of PLA is 40g / L;

[0041] (2) Use the gas-driven liquid phase stripping method to strip the graphite in the raw material dispersion, control the liquid phase flow rate to 50L / h, the gas flow rate to 800L / h, and the number of cycles to 50 times, the length of the stripping tube is 30cm, and the inner diameter is 2.5 mm, to obtain a dispersion containing PLA, graphene and graphite powder;

[0042] (3) Put the dispersion in step (2) into a centrifuge to remove unstripped graphite powder, set the speed at 800rpm for 70min; obtain the dispersion of graphene / PLA;

[0043] (4) measure a certain volume of methanol (the volume rat...

Embodiment 3

[0047](1) Take a certain amount of PLA, ABS and graphite powder, first PLA and ABS are dissolved in the organic solvent N-N dimethylformamide together, and are configured into a certain concentration of PLA, ABS solution; then add graphite powder wherein, Raw material dispersion is obtained; the mass ratio of graphite powder and PLA, ABS (total) in the raw material dispersion is 0.5:1; the total concentration of PLA and ABS is 50g / L (wherein the concentration ratio of PLA and ABS is 1:1);

[0048] (2) Use the gas-driven liquid phase exfoliation method to exfoliate the graphite in the raw material dispersion, control the liquid phase flow rate to 200L / h, the gas flow rate to 3000L / h, and the number of cycles to 80 times, the length of the exfoliation tube is 2cm, and the inner diameter is 5mm , to obtain a dispersion containing PLA, ABS, graphene and graphite powder;

[0049] (3) Put the dispersion in step (2) into a centrifuge to remove unstripped graphite powder, set the cent...

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Abstract

The invention discloses a preparation method of a conductive 3D printing graphene composite material with high mechanical strength. A high-molecular polymer and graphite powder are dispersed in an organic solvent together, and the graphite powder is stripped by adopting a gas-driven liquid phase stripping method. Due to addition of the high-molecular polymer, not only can stripping of graphite be promoted to obtain high-quality graphene which is complete in crystal lattice, low in lamella thickness and large and uniform in transverse size, but also the compounding effect of the polymer and the graphene can be effectively improved, and the problems that the graphene is difficult to disperse and easy to agglomerate in the polymer are solved; and the method is mild in operation condition, simple in process, low in equipment requirement and easy for large-scale production and has a good industrialization prospect, and the obtained conductive 3D printing graphene composite material has the advantages of high mechanical strength, high thermal stability and the like and has a wide application prospect in the field of 3D printing.

Description

technical field [0001] The invention belongs to the technical field of 3D printing material preparation, and in particular relates to a preparation method of a conductive 3D printing graphene composite material with high mechanical strength. Background technique [0002] 3D printing technology, also known as additive manufacturing technology. According to the definition published by the American Society for Testing and Materials (ASTM), additive manufacturing is a way of manufacturing layer by layer based on 3D CAD model data, which is diametrically opposed to traditional material processing methods. [0003] Fused deposition modeling (FDM) is one of the commonly used 3D printing technologies. Its working principle is to first draw the polymer into a filament. When printing, the filament is heated and melted at the nozzle, and the substrate is swept over the substrate according to the set program, and the layers are stacked. Solidify and cool to form. The commonly used mat...

Claims

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Application Information

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IPC IPC(8): C08L55/02C08L67/04C08L29/04C08L75/04C08K3/04C01B32/19B33Y70/10
CPCC08K3/042C08L55/02C08L67/04C08L29/04C01B32/19B33Y70/10C08L2201/08C08K2201/001C08L75/04
Inventor 张智亮吕冰倩刘威陆佳琪沈书缘计建炳
Owner ZHEJIANG UNIV OF TECH