Composite fireboard with electromagnetic shielding function and preparation method thereof

A composite fiber and electromagnetic shielding technology, which is applied in the field of composite fiberboard preparation, can solve the problems of low electromagnetic shielding efficiency in low frequency bands, and achieve the effect of solving poor fire resistance, light weight and good natural properties.

Active Publication Date: 2015-11-25
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because graphite itself is diamagnetic, the electromagnetic shielding efficiency in low frequency bands is relatively low. First, magnetic metal particles must be loaded into expanded graphite to adjust the relationship between the electrical properties and magnetic properties of the matching composite material, and obtain excellent electromagnetic shielding performance in a wide frequency range. s material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] 1. Preparation of expanded graphite: First weigh 30.0g of expanded graphite and put it in a 2L round bottom flask, add 40ml of nitric acid with a mass fraction of 65%, 80ml of phosphoric acid with a mass fraction of 85%, and 6g of potassium permanganate, using a stirring paddle Stir at room temperature for 60 minutes, filter and dry to obtain acidified graphite. Weigh the quality of acidified graphite after drying to be 50g, put it into a 2L round bottom flask, add 250ml of acetic acid with a mass fraction of 99.5%, 75ml of nitric acid and 7.5g of potassium permanganate with a mass fraction of 65%, and use a stirring blade to Stir for 60 minutes, filter and dry to obtain acidified graphite. Finally, put the acidified graphite oxide into a microwave oven and heat it with a power of 700w for 1 minute to obtain expanded graphite.

[0040]2. Preparation of nickel-zinc ferrite expanded graphite: first weigh 10g of nickel nitrate hexahydrate, 40.91g of zinc nitrate hexahydra...

Embodiment 2

[0044] 1. Preparation of expanded graphite: First weigh 30.0g of expanded graphite and put it in a 2L round bottom flask, add 40ml of nitric acid with a mass fraction of 60%, 80ml of phosphoric acid with a mass fraction of 85%, and 6g of potassium permanganate, and use a stirring paddle at 20 Stir at room temperature for 60 minutes, filter and dry to obtain acidified graphite. Weigh the quality of the acidified graphite after drying to be 50g, put it into a 2L round bottom flask, add 250ml of acetic acid with a mass fraction of 99.5%, 75ml of nitric acid with a mass fraction of 65%, and 7.5g of potassium permanganate. Stir for 60 minutes, filter and dry to obtain acidified graphite. Finally, put the acidified graphite oxide into a microwave oven and heat it with a power of 650w on a high fire for 1 minute to obtain expanded graphite.

[0045] 2. Preparation of nickel-zinc ferrite expanded graphite: first weigh 10g of nickel nitrate hexahydrate, 15.36g of zinc nitrate hexahydr...

Embodiment 3

[0049] 1. Preparation of expanded graphite: First weigh 30.0g of expanded graphite and put it in a 2L round bottom flask, add 40ml of nitric acid with a mass fraction of 65%, 80ml of phosphoric acid with a mass fraction of 85%, and 6g of potassium permanganate, and use a stirring paddle at 25 Stir at room temperature for 60 minutes, filter and dry to obtain acidified graphite. Weigh the quality of acidified graphite after drying to be 50g, put it into a 2L round bottom flask, add 250ml of acetic acid with a mass fraction of 99.5%, 75ml of nitric acid with a mass fraction of 65%, and 7.5g of potassium permanganate. Stir for 60 minutes, filter and dry to obtain acidified graphite. Finally, put the acidified graphite oxide into a microwave oven and heat it with a power of 700w for 1 minute to obtain expanded graphite.

[0050] 2. Preparation of nickel-zinc ferrite expanded graphite: first weigh 10g of nickel nitrate hexahydrate, 6.8g of zinc nitrate hexahydrate, 46.19g of iron n...

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Abstract

The invention provides a composite fireboard with the electromagnetic shielding function and a preparation method of the composite fireboard. The composite fireboard is mainly prepared by compositing nickel zinc ferrite expanded graphite and wood fibers in mass ratio of 2-7: 3; the composite fiberboard is 2-5mm in thickness, and 0.7-1.0g/cm<3> in density. The preparation method comprises the following steps: respectively weighing the wood fibers and nickel zinc ferrite expanded graphite, and uniformly mixing to obtain a first mixture; adding a certain amount of isocyanate adhesives to the first mixture, and uniformly stirring to obtain raw materials for being pressed to prepare the board, wherein the dosage of the isocyanate adhesives is 8 to 16% of the total mass of the wood fibers and nickel zinc ferrite expanded graphite; uniformly paving the obtained raw materials for being pressed to prepare the board, and then prepressing and thermally pressing to obtain the composite fireboard with the electromagnetic shielding function. According to the composite fireboard, the electromagnetic shielding effect can be more than 50dB averagely within the range from 0.3 to 1500MHz, and the bandwidth is 11-17GHz when the electromagnetic wave reflection coefficient reaches -5dB within the range from 2 to 18GHz.

Description

technical field [0001] The invention relates to the field of wood-based panels. More specifically, the present invention relates to a method for preparing a composite fiberboard with electromagnetic shielding function. Background technique [0002] With the rapid development of science and technology, various electronic appliances are widely used, and electromagnetic interference and electromagnetic radiation pollution have become an environmental hazard. These hazards can be reduced by using electromagnetic shielding materials to reflect or absorb electromagnetic waves. [0003] Since wood is the only renewable and naturally degradable biological resource among the four major materials (steel, cement, wood, and plastic) in the world today, wood-based electromagnetic shielding materials have become one of the hot topics of today's attention. Zhao Guangjie and Li Jian's research group successively Plating Ni, Cu or Ni-Cu-P ternary alloy on the wood surface has good electrom...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B27N3/04B27N3/08C01B31/00
Inventor 苏初旺陈义袁全平黄景达夏俊伟杨兵雷小军唐志华
Owner GUANGXI UNIV
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