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Wire of 3D printing polylactic acid/conductive filler electromagnetic shielding composite material, preparation method and application

A conductive filler and 3D printing technology, applied in the fields of magnetic field/electric field shielding, conductive/antistatic filament manufacturing, single-component polyester artificial filament, etc., can solve poor electromagnetic shielding performance, poor electromagnetic shielding performance, carbon Uniform dispersion of nanotubes and other issues to achieve the effect of ensuring electromagnetic shielding performance and solving poor electromagnetic shielding performance

Pending Publication Date: 2022-07-26
东部湾(扬州)生物新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention improves the uniform dispersion and combination of conductive fillers in polylactic acid by adding activated conductive materials and D-polylactic acid to modify materials, and solves the problem that carbon nanotubes cannot be uniformly dispersed in polylactic acid in the prior art. The final product will show a high electromagnetic shielding value in a certain area, while the electromagnetic shielding performance of the rest of the area is poor, and finally the overall electromagnetic shielding performance of the material is not good.

Method used

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  • Wire of 3D printing polylactic acid/conductive filler electromagnetic shielding composite material, preparation method and application
  • Wire of 3D printing polylactic acid/conductive filler electromagnetic shielding composite material, preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0033] Example 1: Preparation of 3D printed polylactic acid / conductive filler electromagnetic shielding composites

[0034] The electromagnetic shielding composite material is made from the following raw materials by weight: 0.5 parts of carbon nanotubes, 300 parts of a mixture of concentrated sulfuric acid and concentrated nitric acid (the mass of concentrated sulfuric acid and concentrated nitric acid is 3:1), 80 parts of polylactic acid, and dextrorotatory polylactic acid. 20 servings of lactic acid.

[0035] The specific implementation steps are as follows:

[0036] Step 1: take carbon nanotubes, add a mixture of concentrated sulfuric acid and concentrated nitric acid for activation, and prepare acidified carbon nanotubes, which are for subsequent use, wherein the carbon nanotubes are 0.5 parts by weight, and the mixture of concentrated sulfuric acid and concentrated nitric acid is 300 parts by weight. (The mass ratio is 3:1), the activation temperature of the acidified c...

Embodiment example 2

[0043] Implementation Case 2: Preparation of 3D Printing Polylactic Acid / Conductive Filler Electromagnetic Shielding Composites

[0044] The specific preparation method is as in Embodiment 1; the parts by weight of the mixture of concentrated sulfuric acid and concentrated nitric acid in Step 1 of Example 1 are changed to 350 parts, and the mass ratio thereof is changed to 3:2, and the remaining steps are unchanged to obtain Embodiment 2.

Embodiment example 3

[0045] Implementation Case 3: Preparation of 3D Printing Polylactic Acid / Conductive Filler Electromagnetic Shielding Composites

[0046] The specific implementation method is as in Embodiment 1; the parts by weight of polylactic acid in step 3 are changed to 120 parts, and the remaining steps remain unchanged to obtain Embodiment 2.

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Abstract

The invention discloses a wire of a 3D printing polylactic acid / conductive filler electromagnetic shielding composite material, a preparation method and application. The wire material provided by the invention is prepared from the following materials: 70-90 parts of polylactic acid, 10-30 parts of dextropolylactic acid and 0.5-1 part of acidized conductive filler. According to the wire disclosed by the invention, polylactic acid stereocomplex crystals are formed in situ in polylactic acid by adding the dextropolylactic acid, and the carbon nanotubes are further controlled to be uniformly dispersed in the polylactic acid by utilizing the inherent strong interaction between the polylactic acid and the dextropolylactic acid, so that the electromagnetic shielding performance of the composite material is ensured.

Description

technical field [0001] The invention relates to the field of electromagnetic shielding composite materials, in particular to a wire material of a 3D printing polylactic acid / conductive filler electromagnetic shielding composite material, a preparation method and an application. Background technique [0002] With the continuous development of science and technology, human life is more and more convenient, but electromagnetic pollution is also gradually serious. In most cases, electromagnetic shielding materials are mainly made of metal materials. Although metal materials are easy to recycle, their disadvantages such as high density and easy corrosion are not conducive to the long-term use of products. At present, a composite material process is also used to blend conductive fillers such as metals with epoxy resins. Although this strategy reduces the overall density of electromagnetic shielding materials, epoxy resins are difficult to recycle and have a certain impact on the e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F6/92D01F1/09B33Y70/10H05K9/00
CPCD01F6/92D01F1/09B33Y70/10H05K9/0083
Inventor 杨家龙陈晓苏殷明丁恩杰
Owner 东部湾(扬州)生物新材料有限公司
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