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Wave-absorbing material based on biological waste and magnetic material waste and preparation method of wave-absorbing material

A technology of magnetic materials and biological waste, applied in chemical instruments and methods, other chemical processes, magnetic field/electric field shielding, etc., can solve problems affecting the ecological environment, occupying land resources, etc., and achieve low cost, excellent wave-absorbing performance, high density small effect

Active Publication Date: 2020-08-25
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of these magnetic material wastes are simply disposed of in landfills, which not only takes up a lot of land resources, but also affects the ecological environment.

Method used

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  • Wave-absorbing material based on biological waste and magnetic material waste and preparation method of wave-absorbing material
  • Wave-absorbing material based on biological waste and magnetic material waste and preparation method of wave-absorbing material
  • Wave-absorbing material based on biological waste and magnetic material waste and preparation method of wave-absorbing material

Examples

Experimental program
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Effect test

preparation example Construction

[0027] Such as figure 1 As shown, a method for preparing a wave-absorbing material based on biological waste and magnetic material waste may specifically include the following steps:

[0028] Step 1. After the biological waste is dried in the air environment, it is mixed with zinc chloride, and then placed in a tube furnace under the protection of a protective gas (the protective gas can be nitrogen or a rare gas, but preferably nitrogen) Carry out calcination, and wash the product obtained by calcination with HCL aqueous solution (0.1Mol), distilled water and ethanol, remove the residue, adjust the pH value of the product to be neutral at the same time, and then dry it in an oven at 60°C to 80°C to prepare get biochar.

[0029] Step 2: Perform mechanical ball milling on the magnetic material waste, the ball milling time is 8-24 hours, the ball milling speed is 400-500 rpm, and the mass ratio of ball to material is 20-40, so as to obtain magnetic fine powder with a particle s...

Embodiment 1

[0047] A kind of wave-absorbing material based on biological waste and magnetic material waste, its preparation method comprises the following steps:

[0048] Step 1. Put the coffee grounds in an oven and dry them at 90°C for 12 hours, mix them with zinc chloride according to the weight ratio of dried coffee grounds: zinc chloride = 1:0.5, and then put the mixture into a tube furnace Calcination is carried out under the protection of nitrogen. The calcination process is to raise the temperature from room temperature to 900°C at a rate of 10°C / min, and heat at a constant temperature for 1 hour; the calcined product is washed with HCL aqueous solution (0.1Mol), distilled water and ethanol to remove residue, while adjusting the pH value of the product to be neutral, and then drying it in an oven at 60°C to obtain biochar (the morphology of the biochar is shown in image 3 shown).

[0049] Step 2, block magnetic material scrap (MnFe 2 o 4 ) for mechanical ball milling, the ball...

Embodiment 2

[0054] A kind of wave-absorbing material based on biological waste and magnetic material waste, its preparation method comprises the following steps:

[0055] Step 1. Put the coffee grounds in an oven and dry them at 90°C for 12 hours, mix them with zinc chloride according to the weight ratio of dried coffee grounds: zinc chloride = 1:0.5, and then put the mixture into a tube furnace Calcination is carried out under the protection of nitrogen. The calcination process is to raise the temperature from room temperature to 900°C at a rate of 10°C / min, and heat at a constant temperature for 1 hour; the calcined product is washed with HCL aqueous solution (0.1Mol), distilled water and ethanol to remove The residue was adjusted to a neutral pH value, and then dried in an oven at 60°C to prepare biochar.

[0056] Step 2, block magnetic material scrap (MnFe 2 o 4 ) to carry out mechanical ball milling, the ball milling speed is 500rpm, the mass ratio of ball to material is 30:1, and ...

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Abstract

The invention discloses a wave-absorbing material based on biological waste and magnetic material waste and a preparation method of the wave-absorbing material. The wave-absorbing material is preparedfrom the biological waste and the magnetic material waste. The specific preparation method comprises the following steps of: preparing the biochar from biological waste; preparing magnetic refined powder from the magnetic material waste; and mixing the biochar and the magnetic refined powder together to prepare the wave-absorbing material based on the biological waste and the magnetic material waste. The biological waste and the magnetic material waste are effectively utilized, the preparation process of the wave-absorbing material is simple; and the prepared wave-absorbing material is smallin density, light in weight, thin in thickness, wide in frequency band and excellent in wave-absorbing performance.

Description

technical field [0001] The invention relates to the field of electromagnetic wave absorbing materials (ie, wave absorbing materials), in particular to a wave absorbing material based on biological waste and magnetic material waste and a preparation method thereof. Background technique [0002] With the continuous development of electronic information technology, electromagnetic pollution is becoming more and more serious, which endangers people's life and health. The use of absorbing materials can effectively solve this problem. Due to the continuous change of practical application requirements, the wave-absorbing material has developed from the traditional requirement of high absorption strength to the direction of "thin, light, wide, and strong". One of the urgent problems to be solved. [0003] Biomass materials are rich in raw materials and low in cost, so they have great application prospects in the preparation of carbonaceous materials. Biological waste (such as: ri...

Claims

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Application Information

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IPC IPC(8): C09K3/00H05K9/00
CPCC09K3/00H05K9/0081
Inventor 盛志高丁伟
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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