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Co3O4-carbon nanotube modified polyurethane composite electromagnetic shielding material

A carbon nanotube modification and composite electromagnetic technology, which is applied in the direction of magnetic/electric field shielding and electrical components, can solve the problems of low reflection loss and dielectric loss, poor electromagnetic shielding efficiency, and complicated preparation procedures, etc., and achieve reduction Effects of thickness and weight, improvement of electromagnetic shielding effectiveness, and simplification of the manufacturing process

Inactive Publication Date: 2020-02-14
蔡娟
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies of the prior art, the present invention provides a Co 3 o 4 - The composite electromagnetic shielding material of carbon nanotube modified polyurethane solves the problems of thicker thickness, larger quality, complicated preparation process and high cost of traditional electromagnetic shielding materials. The performance is poor, the reflection loss and dielectric loss are low, and the electromagnetic absorption frequency band is very narrow, resulting in the problem of poor electromagnetic shielding effectiveness

Method used

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preparation example Construction

[0025] To achieve the above object, the present invention provides the following technical solutions: a Co 3 o 4 - A composite electromagnetic shielding material of carbon nanotube modified polyurethane, including the following raw materials in parts by weight, characterized in that: 3-8 parts of magnetic cobalt tetroxide, 15-20 parts of single-walled carbon nanotubes, and 10-15 parts of triene Propyl isocyanurate, 50-70 parts of polyurethane resin, 1-3 parts of alkalizing agent, 0.5-2 parts of foaming agent, 0.5-2 parts of dispersing agent, magnetic cobalt tetroxide has a spinel structure, and cobalt oxide CoO The mass fraction is 30.1-31.5%, high cobalt oxide Co 2 o 3 The mass fraction is 66.2-67.4%. Single-walled carbon nanotubes are allotropes of carbon. The outer diameter of single-walled carbon nanotubes is 16-35 nm, the inner diameter is 1-3 nm, and the length is 3-6um. Urate is triallyl isocyanurate, the structure is hexagonal sheet crystal, and the structural formu...

Embodiment 1

[0033] (1) Preparation of alkalized single-walled carbon nanotubes: Weigh 1 part of alkalization agent into a three-neck bottle, and inject N into the three-neck bottle 2 , and then add 15 parts of single-walled carbon nanotubes, place the three-necked bottle in an ultrasonic processor, conduct ultrasonic treatment for 2-3 h, then place the three-necked bottle in a water bath, heat the water bath to 65-70 °C, and react 18-20 h, after the reaction is complete, the material is filtered through a Buchner funnel, and the filtered material is washed with 2500-3000 mL of distilled water to remove the residual alkalizing agent until the material is neutral, and the material is placed in an oven and heated to 80-85 ℃, dry for 2-3 h, and dry the water to obtain alkalized single-walled carbon nanotubes in black powdery solid, OH-SWNT-HOC(CH 3 ) 3 Nanoparticles1.

[0034] (2) Preparation of magnetic Co 3 o 4 Modified alkalized single-walled carbon nanotube material: Weigh 3 parts of ...

Embodiment 2

[0038] (1) Preparation of alkalized single-walled carbon nanotubes: Weigh 1.5 parts of alkalization agent into a three-neck bottle, and pass N 2 , and then add 16 parts of single-walled carbon nanotubes, place the three-necked bottle in an ultrasonic processor, conduct ultrasonic treatment for 2-3 h, then place the three-necked bottle in a water bath, heat the water bath to 65-70 °C, and react 18-20 h, after the reaction is complete, the material is filtered through a Buchner funnel, and the filtered material is washed with 2500-3000 mL of distilled water to remove the residual alkalizing agent until the material is neutral, and the material is placed in an oven and heated to 80-85 ℃, dry for 2-3 h, and dry the water to obtain alkalized single-walled carbon nanotubes in black powdery solid, OH-SWNT-HOC(CH 3 ) 3 Nanoparticles 2.

[0039] (2) Preparation of magnetic Co 3 o 4 Modified alkalized single-walled carbon nanotube material: Weigh 4 parts of magnetic cobalt tetroxide...

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Abstract

The invention relates to the technical field of electromagnetic shielding materials, and discloses a Co3O4-carbon nanotube modified polyurethane composite electromagnetic shielding material. Raw materials of the composite electromagnetic shielding material comprise magnetic cobaltosic oxide, single-walled carbon nanotubes, triallyl isocyanurate, polyurethane resin, an alkalizing agent, a foaming agent and a dispersing agent, wherein the magnetic cobaltosic oxide is of a spinel structure, and the polyurethane is polyether type polyurethane. According to the composite electromagnetic shielding material, the polyurethane is used as a matrix of the electromagnetic shielding material; the thickness and the weight of the electromagnetic shielding material are reduced and the production cost is reduced; the alkalized single-walled carbon nanotubes are added to modify the polyurethane, basic groups in the alkalized single-walled carbon nanotubes and carbonyl groups of the triallyl isocyanurateform hydrogen bonds, and the triallyl isocyanurate is thermally crosslinked with the polyurethane, so that the effects of heat resistance, impact toughness and mechanical properties of hardness of the composite electromagnetic shielding material are enhanced.

Description

technical field [0001] The invention relates to the technical field of electromagnetic shielding materials, specifically a Co 3 o 4 -Composite electromagnetic shielding material of carbon nanotube modified polyurethane. Background technique [0002] Electromagnetic interference is the electronic noise that interferes with the cable signal and reduces the integrity of the signal. The propagation path of electromagnetic interference is generally divided into two types: conduction coupling and radiation coupling. Any occurrence of electromagnetic interference must have the transmission and transmission of interference energy. It is generally believed that there are two ways of electromagnetic interference transmission: one is conduction transmission; the other is radiation transmission. Therefore, from the perspective of the interfered sensor, interference coupling can be divided into two categories: conduction coupling and radiation coupling. Interference refers to the inter...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L75/08C08K13/02C08K3/22C08K3/04C08K5/3492C08J9/10C08J9/08H05K9/00
CPCC08J9/0028C08J9/0066C08J9/0071C08J9/08C08J9/102C08J2203/02C08J2203/04C08J2203/18C08J2375/08C08K5/34924C08K13/02C08K2003/2289C08K2201/01C08K2201/011C08K3/041H05K9/0081
Inventor 蔡娟
Owner 蔡娟
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