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Polyvinylidene fluoride based polymer with porous structure and preparation method thereof

A technology of polyvinylidene fluoride and porous structure, which is applied in the field of electromagnetic shielding materials and can solve problems such as difficult protection

Active Publication Date: 2020-07-03
ZHEJIANG NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the electromagnetic shielding effectiveness of this material only shows selective electromagnetic shielding characteristics in a narrow frequency range (8.2-12.4GH), and it is difficult to play a good protective role in the electromagnetic wave environment with a wide frequency range today.

Method used

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  • Polyvinylidene fluoride based polymer with porous structure and preparation method thereof
  • Polyvinylidene fluoride based polymer with porous structure and preparation method thereof
  • Polyvinylidene fluoride based polymer with porous structure and preparation method thereof

Examples

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preparation example Construction

[0026] The invention provides a method for preparing a polyvinylidene fluoride-based polymer with a porous structure, comprising the following steps:

[0027] Mix soluble nickel salt, hydrazine hydrate, inorganic base and water for reduction reaction to obtain sea urchin-shaped nickel;

[0028] mixing the sea urchin-shaped nickel, polyvinylidene fluoride, carbon nanotubes and a nitrogen-containing solvent, drying and injection-molding the obtained slurry in sequence to obtain a non-porous polyvinylidene fluoride-based polymer;

[0029] Under air-isolated conditions, the non-porous polyvinylidene fluoride-based polymer is intermittently foamed with a supercritical fluid to obtain a polyvinylidene fluoride-based polymer with a porous structure.

[0030] In the present invention, unless otherwise specified, all raw material components are commercially available products well known to those skilled in the art.

[0031] The invention mixes soluble nickel salt, hydrazine hydrate, i...

Embodiment 1

[0059] according to figure 1 The flow chart shown prepares polyvinylidene fluoride-based polymers with a porous structure.

[0060] Dissolve 5mmol of nickel sulfate hexahydrate in 50mL of deionized water, add 0.2mmol of hydrazine hydrate and 3mmol of NaOH and stir and mix for 10min, transfer the resulting reaction solution to a 100mL Teflon reactor, perform a reduction reaction at 100°C for 4h, and cool naturally to room temperature, followed by washing with deionized water, washing with ethanol and separating with a permanent magnet to obtain sea urchin-shaped nickel.

[0061]Mix PVDF and DMF under magnetic stirring at 60°C for 3 hours to obtain PVDF solution (1g / mL), add sea urchin-like nickel (Ni), MWCNT (mass ratio of PVDF:MWCNT:Ni=1:0.1), and mechanically stir and ultrasonically oscillated for 1 h to obtain a PVDF / CNTs / Ni mixed solution; transfer the PVDF / CNTs / Ni mixed solution to an evaporating dish, place it in a vacuum oven at 60°C for 5 h to completely remove the sol...

Embodiment 2

[0065] According to the method of Example 1, a polyvinylidene fluoride-based polymer with a porous structure is prepared. The difference from Example 1 is that the intermittent foaming temperature is 165 ° C, and a polyvinylidene fluoride-based polymer with a porous structure is obtained. (No. F-165).

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Abstract

The invention provides a polyvinylidene fluoride based polymer with a porous structure and a preparation method thereof, and relates to the technical field of electromagnetic shielding materials. Thepreparation method for the polyvinylidene fluoride based polymer with the porous structure provided by the invention comprises the following steps: mixing soluble nickel salt, hydrazine hydrate, inorganic base and water, and carrying out a reduction reaction so as to obtain urchin-shaped nickel; mixing the urchin-shaped nickel, polyvinylidene fluoride, carbon nanotubes and a nitrogen-containing solvent, drying an obtained slurry, and carrying out injection molding so as to obtain a non-porous polyvinylidene fluoride based polymer; and carrying out intermittent foaming on the non-porous polyvinylidene fluoride based polymer by using a supercritical fluid so as to obtain the polyvinylidene fluoride based polymer with the porous structure. The polyvinylidene fluoride based polymer with the porous structure and prepared by using the preparation method disclosed by the invention has highly-efficient electromagnetic shielding performance within a range of 18-26.5 GHz.

Description

technical field [0001] The invention relates to the technical field of electromagnetic shielding materials, in particular to a polyvinylidene fluoride-based polymer with a porous structure and a preparation method thereof. Background technique [0002] In recent years, with the rapid development of 5G wireless communication technology, the spatial layout of communication equipment tends to be miniaturized and dense. What follows is increasingly serious electromagnetic wave pollution, which will not only lead to malfunction of high-precision electronic devices, but may even damage people's health. At present, traditional metal shielding materials generally have shortcomings such as high density, easy corrosion, and complicated processing technology, and are difficult to apply in special fields such as aerospace and open-air environments. [0003] New conductive polymer composites have been widely recognized by scholars due to their light weight, corrosion resistance and simp...

Claims

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Application Information

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IPC IPC(8): C08J9/12C08L27/16C08K7/00C08K3/08C08K3/04B29C45/76B29C45/77B29C45/78B29C67/20B29C69/02
CPCC08J9/122C08J9/0066C08J9/0071B29C45/78B29C45/77B29C45/76B29C67/20B29C69/02C08J2203/06C08J2203/08C08J2327/16B29C2945/76531B29C2945/76498B29C2945/76561B29C2945/76668B29C2945/76732B29C2945/76859B29C2945/76862
Inventor 李熹平曾水萍胡仲略李梦佳郑佳佳宫宁宁王博文
Owner ZHEJIANG NORMAL UNIVERSITY
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