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Preparation method of polyurethane/graphene nanosheet/sponge composite material

A technology of graphene nanosheets and composite materials, which is applied in the fields of magnetic field/electric field shielding, electrical components, etc., can solve problems such as poor electromagnetic shielding, and achieve the effects of low production cost, simple preparation process and fast operation.

Pending Publication Date: 2021-06-15
XIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a preparation method of polyurethane / graphene nanosheet / sponge composite material, which solves the problem of poor electromagnetic shielding of existing porous materials

Method used

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  • Preparation method of polyurethane/graphene nanosheet/sponge composite material
  • Preparation method of polyurethane/graphene nanosheet/sponge composite material
  • Preparation method of polyurethane/graphene nanosheet/sponge composite material

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Embodiment 1

[0046] A kind of preparation method of polyurethane / graphene nanosheet / sponge composite material of the present invention, specifically implement according to the following steps:

[0047] Step 1, dispersing the graphene nanosheets as a solute into deionized water, stirring and ultrasonicating at room temperature, to obtain a water dispersion solution of graphene nanosheets;

[0048] The mass ratio of graphene nanosheets to deionized water is 1:100; the ultrasonic time is 30min;

[0049] Step 2, immerse the cuboid nano-sponge in the graphene nano-sheet solution, ultrasonically disperse it several times, and dry to completely evaporate the solvent to obtain the nano-sponge material wrapped by the graphene nano-sheet;

[0050] The drying temperature is 60°C, and the drying time is 10 minutes; the frequency of ultrasonic dispersion is 1 time; the time of each ultrasonic dispersion is 30 minutes; the size of the cuboid nano-sponge is 22.58mm*10.14mm*2mm;

[0051] In step 3, the the...

Embodiment 2

[0053] A kind of preparation method of polyurethane / graphene nanosheet / sponge composite material of the present invention, specifically implement according to the following steps:

[0054] Step 1, dispersing the graphene nanosheets as a solute into deionized water, stirring and ultrasonicating at room temperature, to obtain a water dispersion solution of graphene nanosheets;

[0055] The mass ratio of graphene nanosheets to deionized water is 1:100; the ultrasonic time is 40min;

[0056] Step 2, immerse the cuboid nano-sponge in the graphene nano-sheet solution, ultrasonically disperse it several times, and dry to completely evaporate the solvent to obtain the nano-sponge material wrapped by the graphene nano-sheet;

[0057] The drying temperature is 65°C, and the drying time is 15 minutes;

[0058] The number of times of ultrasonic dispersion is 2 times; the time of each ultrasonic dispersion is 40min;

[0059] The size of the cuboid nano-sponge is 22.58mm*10.14mm*2mm;

[...

Embodiment 3

[0062] A kind of preparation method of polyurethane / graphene nanosheet / sponge composite material of the present invention, specifically implement according to the following steps:

[0063] Step 1, dispersing the graphene nanosheets as a solute into deionized water, stirring and ultrasonicating at room temperature, to obtain a water dispersion solution of graphene nanosheets;

[0064] The mass ratio of graphene nanosheets to deionized water is 1:100; the ultrasonic time is 1h;

[0065] Step 2, immerse the cuboid nano-sponge in the graphene nano-sheet solution, ultrasonically disperse it several times, and dry to completely evaporate the solvent to obtain the nano-sponge material wrapped by the graphene nano-sheet;

[0066] The drying temperature is 70°C, and the drying time is 30 minutes;

[0067] The number of times of ultrasonic dispersion is 3 times; the time of each ultrasonic dispersion is 1h;

[0068] The size of the cuboid nano-sponge is 22.58mm*10.14mm*2mm;

[0069] ...

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Abstract

The invention discloses a preparation method of a polyurethane / graphene nanosheet / sponge composite material. The method specifically comprises the following steps of: dispersing graphene nanosheets serving as a solute into deionized water, and performing stirring and ultrasonic treatment to obtain a graphene nanosheet water dispersion solution; immersing cuboid-shaped nano sponge into the graphene nanosheet solution, performing ultrasonic dispersion for multiple times, and performing drying to obtain a graphene nanosheet wrapped nano sponge material; and finally, wrapping the graphene nanosheet wrapped nano sponge material with thermoplastic polyurethane to obtain the polyurethane / graphene nanosheet / sponge composite material. The nano sponge is wrapped by the graphene nanosheets, a conductive network porous structure is formed, and electromagnetic waves can be attenuated through electrical loss. Due to the protection of the thermoplastic polyurethane layer and the inherent elasticity of the nano sponge, the prepared composite material still has excellent electromagnetic shielding performance even if subjected to severe physical and chemical damage and long-term compression cycle.

Description

technical field [0001] The invention belongs to the technical field of composite material preparation, and in particular relates to a preparation method of polyurethane / graphene nanosheet / sponge composite material. Background technique [0002] At present, there is an urgent need for high-performance electromagnetic shielding interference materials to eliminate the increasingly serious electromagnetic radiation brought about by the vigorous development of electronic equipment. Electromagnetic radiation will cause adverse effects on human health and electronic equipment. Although metal is considered as the best electromagnetic shielding material due to its excellent electrical conductivity, its disadvantages such as easy oxidation, corrosion, high density, high processing cost, and environmental pollution seriously restrict its application. In recent years, conductive polymer composites have been considered as the most promising electromagnetic shielding materials due to thei...

Claims

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Application Information

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IPC IPC(8): H05K9/00
CPCH05K9/0088
Inventor 任芳卢震霞伏柏桥郭铮铮任鹏刚
Owner XIAN UNIV OF TECH