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A carbon nanotube-graphite-polyvinylidene fluoride ternary composite material with negative dielectric properties and its preparation method

A technology of polyvinylidene fluoride and polyvinylidene fluoride powder, which is applied in the field of carbon nanotube-graphite-polyvinylidene fluoride ternary composite materials and its preparation, and can solve the problems of unstable dielectric properties and high absolute value of negative dielectric problem, to achieve the effect of low cost, uniform powder, and easy formation of conductive grid

Active Publication Date: 2020-12-15
SHANGHAI MARITIME UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the shortcomings of the existing binary composite materials such as unstable dielectric properties and high absolute value of negative dielectric, and provide a ternary composite with weak negative dielectric and easier regulation of the value of negative dielectric constant. Material

Method used

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  • A carbon nanotube-graphite-polyvinylidene fluoride ternary composite material with negative dielectric properties and its preparation method
  • A carbon nanotube-graphite-polyvinylidene fluoride ternary composite material with negative dielectric properties and its preparation method

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Embodiment 1

[0030] A method for designing a carbon nanotube-graphite-polyvinylidene fluoride ternary composite material with negative dielectric properties, comprising the steps of:

[0031] Step (1), weighing 0.32 grams of functional body powder and 1.68 grams of polyvinylidene fluoride powder with an electronic balance, so that the mass fraction of the functional body in the composite material is 16%; the functional body contains 0.16 grams of carbon nanotubes Powder and 0.16 g of graphite powder, that is, the mass ratio of carbon nanotubes to graphite is 2:2.

[0032] In step (2), put the powder weighed in step (1) into a ball mill and centrifuge for 20 minutes at a speed of 1500r, and then manually grind and mix at room temperature. The order of addition is to add carbon nanotubes first And graphite, then add polyvinylidene fluoride. Considering that the three powders are all light, and the proportion of carbon nanotubes and graphite is small, if carbon nanotubes and graphite are add...

Embodiment 2

[0038] A method for designing a carbon nanotube-graphite-polyvinylidene fluoride ternary composite material with negative dielectric properties, comprising the steps of:

[0039]Step (1), weighing 0.32 gram of functional body powder and 1.68 gram of polyvinylidene fluoride powder with electronic balance respectively, makes the mass fraction of functional body in composite material be 16%; In functional body, contains 0.08 gram of carbon nanotube Powder and 0.24 g of graphite powder, that is, the mass ratio of carbon nanotubes to graphite is 1:3.

[0040] In step (2), put the powder weighed in step (1) into a ball mill and centrifuge for 20 minutes at a speed of 1500r, and then manually grind and mix at room temperature. The order of addition is to add carbon nanotubes first And graphite, then add polyvinylidene fluoride.

[0041] Then put the mixed powder into a mortar and perform artificial shear mixing until all the agglomerated small particles of the powder are evenly disp...

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Abstract

The invention discloses a carbon nanotube-graphite-polyvinylidene fluoride ternary composite material with the negative dielectric property and a preparation method thereof. The composite material isformed by uniformly compounding carbon nanotubes, graphite and polyvinylidene fluoride; the mass sum of the carbon nanotubes and the graphite accounts for 16-20% of the mass percentage of the ternarycomposite material, and the composite material comprises the carbon nanotubes, graphite and the balance polyvinylidene fluoride, wherein the mass ratio of the carbon nanotubes to the graphite is 1:1-1:10. The method includes the following steps that 1, carbon nanotube powder, graphite powder and polyvinylidene fluoride powder are weighed respectively; 2, the powder is mixed and dispersed evenly; 3, the mixed powder is placed in a mold for cold pressing. According to the ternary composite material, a novel functional variable is introduced on the basis of a traditional two-element composite material, so that the composite material has the weak negative dielectric property, and the value of the negative dielectric constant is easier to regulate and control.

Description

technical field [0001] The invention relates to the fields of composite material technology, metamaterial, radio frequency electromagnetic material technology, wireless power transmission, etc., and specifically relates to a carbon nanotube-graphite-polyvinylidene fluoride ternary composite material with negative dielectric properties and a preparation method thereof. Background technique [0002] As a basic parameter to characterize the physical properties of electromagnetic materials, the dielectric constant has important developments in the fields of electromagnetic shielding and absorption when the dielectric constant is negative. Moreover, when a material with a negative permittivity is combined with a material with a negative magnetic permeability, it has many novel electromagnetic properties, such as the inverse Doppler effect, the inverse Gouss-Hans shift effect, and the negative refraction effect. Microwave absorption and wireless power transmission have broad prosp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L27/16C08K3/04
CPCC08K3/04C08K2201/003C08K2201/004C08K2201/011C08K3/041C08L27/16
Inventor 范润华秦锦媛解培涛李晓峰孙凯安燕信家豪
Owner SHANGHAI MARITIME UNIVERSITY