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High-thermal-conductivity Ti3C2Tx/graphene microchip/polylactic acid electromagnetic shielding composite material and 3D printing preparation method thereof

A technology of graphene microchips and composite materials, applied in the fields of magnetic/electric field shielding, chemical instruments and methods, electrical components, etc., can solve problems such as poor electromagnetic shielding performance, achieve improved thermal conductivity, improve electromagnetic shielding performance, and extend distance Effect

Inactive Publication Date: 2021-07-02
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, using FDM 3D printing technology to directly prepare polymer-based electromagnetic shielding composite materials, due to the homogeneous structure of fillers and polymers uniformly distributed inside the electromagnetic shielding composite material, the electromagnetic shielding performance of polymer-based electromagnetic shielding composite materials is poor.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0021] The invention provides a high thermal conductivity Ti 3 C 2 T x / The preparation method of graphene microchip / polylactic acid electromagnetic shielding composite material, comprises the following steps:

[0022] Mix LiF, concentrated hydrochloric acid and water to obtain a stripping solution; 3 AlC 2 The powder is mixed with the stripping solution for the first stripping, and the solid obtained from the first stripping is placed in water for the second ultrasonic stripping to obtain Ti 3 C 2 T x ; the Ti 3 C 2 T x Made of Ti 3 C 2 T x film; the Ti 3 C 2 T x The film was immersed in the polylactic acid solution, and the Ti coated with polylactic acid was taken out. 3 C 2 T x film, and after drying yielded PLA-coated Ti 3 C 2 T x film;

[0023] Melt-blending polylactic acid and graphene microflakes to obtain a premix; extruding the premix to obtain filaments; performing FDM 3D printing on the filaments to obtain sheet-like graphene microflakes / Polyl...

Embodiment 1

[0052] Weigh 2.4 parts by weight of LiF and add it to the mixed solution of 99.5 parts by weight of concentrated hydrochloric acid (concentration is 10mol / L) and 6 parts by weight of deionized water. Slowly add 1.5 parts by weight of Ti to the reactor 3 AlC 2 powder, and then the reaction vessel was sealed, kept at 35°C, and the first exfoliation was performed under magnetic stirring conditions for 24 hours. After the first stripping, all products were transferred to centrifuge tubes, diluted with deionized water, then placed in a centrifuge and centrifuged at 3500 rpm for 5 minutes. After centrifugation, pour off the supernatant and continuously increase the rotating speed, repeat this step until the pH value of the supernatant is 7, then disperse the precipitate with deionized water, place it in an ultrasonic instrument for ultrasonication for 10 minutes, and perform the second ultrasonic stripping ( power is 300W), so that the Ti 3 C 2 T x Fully peeled. Finally put Ti...

Embodiment 2

[0057] Weigh 1.2 parts by weight of LiF and add it to a mixture of 49.8 parts by weight of concentrated hydrochloric acid (concentration: 10mol / L) and 3 parts by weight of deionized water. , slowly add 0.8 parts by weight of Ti to the reactor 3 AlC 2 powder, and then the reaction vessel was sealed, kept at 35°C, and the first exfoliation was performed under magnetic stirring conditions for 24 hours. After the first stripping, all products were transferred to centrifuge tubes, diluted with deionized water, then placed in a centrifuge and centrifuged at 3500 rpm for 5 minutes. After centrifugation, pour off the supernatant and continuously increase the speed, repeat this step until the pH of the supernatant is 7, then disperse the precipitate with deionized water, place it in the ultrasonic instrument for 10 minutes for the second ultrasonic stripping, so that Ti 3 C 2 T x Fully peeled. Finally put Ti 3 C 2 T x Put the aqueous solution into a centrifuge tube, centrifuge...

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Abstract

The invention provides a high-thermal-conductivity Ti3C2Tx / graphene microchip / polylactic acid electromagnetic shielding composite material and a preparation method thereof, and belongs to the technical field of electromagnetic shielding composite materials. A flaky graphene microchip / polylactic acid composite material is prepared by adopting an FDM 3D printing technology, and graphene microchips in the flaky graphene microchip / polylactic acid composite material are oriented, so that the in-plane heat-conducting property of the prepared material is greatly improved; meanwhile, Ti3C2Tx is made into a thin film to carry out microstructure regulation and control on the composite material, so that electromagnetic waves are subjected to multiple reflection, scattering, absorption and other processes in the composite material after entering the composite material with the microstructure regulation and control, the distance of the electromagnetic waves in the material is prolonged, and the electromagnetic shielding performance of the composite material is improved.

Description

technical field [0001] The invention relates to the technical field of electromagnetic shielding composite materials, in particular to a high thermal conductivity Ti 3 C 2 T x / Graphene microsheet / polylactic acid electromagnetic shielding composite material and preparation method thereof. Background technique [0002] 3D printing is an additive manufacturing technology that is different from traditional processing such as turning, milling, planing, and grinding. The principle is layer-by-layer manufacturing and layer-by-layer stacking. It has the advantages of short molding time, high molding accuracy, and low material consumption. Fused deposition modeling (FDM) is the most widely used 3D printing technology. During the FDM3D printing process, the consumables are fed into the melting system of the 3D printer through pinch rollers and driven rollers. After the polymer filament is melted, it is extruded into the nozzle and deposited in the predetermined path, so that the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B9/00B32B9/04B32B27/02B32B27/36B32B27/20B32B33/00C08L67/04C08K7/00C08K3/04B33Y70/10H05K9/00
CPCB32B5/02B32B9/00B32B9/047B32B33/00B32B2250/42B32B2255/26B32B2262/0276B32B2307/212B32B2307/302B33Y70/10C08K7/00C08K3/042H05K9/0081H05K9/0083C08L67/04
Inventor 顾军渭马浩史学涛马腾博
Owner NORTHWESTERN POLYTECHNICAL UNIV
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