Wave-absorbing material based on recycling of agricultural and forestry wastes and preparation method thereof

A technology of agricultural and forestry wastes and wave-absorbing materials is applied in the field of wave-absorbing materials based on the reuse of agricultural and forestry wastes and their preparation, and achieves the effects of rich types, good dielectric loss capability and improved microwave absorption capability.

Active Publication Date: 2020-09-25
LANZHOU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are few literature and patent reports on the preparation of biomass porous carbon by using walnut shell as biomass carbon source and applying it to the field of microwave absorbing materials

Method used

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  • Wave-absorbing material based on recycling of agricultural and forestry wastes and preparation method thereof
  • Wave-absorbing material based on recycling of agricultural and forestry wastes and preparation method thereof
  • Wave-absorbing material based on recycling of agricultural and forestry wastes and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] This embodiment is based on the microwave-absorbing material and its preparation method for the reuse of agricultural and forestry waste, including the following steps:

[0046] (1) Preparation of raw materials: Wash and crush the purchased walnut shells through a 60-mesh sieve, wash them with water and ethanol in sequence, and dry them for later use;

[0047] (2) Ultrasonic activation pretreatment: Take 5g of the dry shell powder from the previous step, mix it with the activator potassium hydroxide at a carbon agent mass ratio of 1:1.5, add it to 75ml deionized water, and perform ultrasonic pretreatment on it for 60 minutes. Filter and dry at 60°C;

[0048] (3) Stage heating carbonization treatment: Take an appropriate amount of the pretreated material in the previous step and put it into a tube furnace, and carry out carbonization reaction treatment in an argon atmosphere. The carbonization process adopts a staged temperature program. Stage heating and carbonization ...

Embodiment 2

[0051] This embodiment is based on the microwave-absorbing material and its preparation method for the reuse of agricultural and forestry waste, including the following steps:

[0052] (1) Preparation of raw materials: Wash and crush the purchased walnut shells through a 60-mesh sieve, wash them with water and ethanol in sequence, and dry them for later use;

[0053] (2) Ultrasonic activation pretreatment: Take 5g of the dry shell powder from the previous step, mix it with the activator potassium hydroxide at a carbon agent mass ratio of 1:1.5, add it to 75ml deionized water, and perform ultrasonic pretreatment on it for 60 minutes. Filter and dry at 60°C;

[0054] (3) Stage heating carbonization treatment: Take an appropriate amount of the pretreated material in the previous step and put it into a tube furnace, and carry out carbonization reaction treatment in an argon atmosphere. The carbonization process adopts a staged temperature program. Stage heating and carbonization ...

Embodiment 3

[0057] This embodiment is based on the microwave-absorbing material and its preparation method for the reuse of agricultural and forestry waste, including the following steps:

[0058] (1) Preparation of raw materials: Wash and pulverize the purchased radix sorbifolia husk through a 60-mesh sieve, wash with water and ethanol in sequence, and dry for later use;

[0059] (2) Ultrasonic activation pretreatment: Take 5g of the dried shell powder from the previous step, mix them with the activator potassium hydroxide and sodium hydroxide according to the carbon agent mass ratio of 1:1.5, add them to 75ml of deionized water, and perform ultrasonic pretreatment on it After 60 minutes, suction filter and dry at 60°C;

[0060] (3) Stage heating carbonization treatment: Take an appropriate amount of the pretreated material in the previous step and put it into a tube furnace, and carry out carbonization reaction treatment in an argon atmosphere. The carbonization process adopts a staged ...

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Abstract

The invention relates to a wave-absorbing material, in particular to a wave-absorbing material based on recycling of agricultural and forestry wastes and a preparation method thereof. According to thematerial, forestry and agricultural wastes (including walnut shells, shiny-leaved yellowhorn shells and the like) are taken as raw materials, a finished porous carbon wave-absorbing material can be obtained through four steps including crushing, sieving and early-stage washing preparation of the raw materials, ultrasonic activation pretreatment, staged heating carbonization treatment and freeze drying treatment, and the purpose of microwave absorption is achieved by utilizing the structural characteristics of the materials. The wave-absorbing material is good in wave-absorbing performance; the agricultural and forestry wastes are used as the raw materials, so traditional agricultural and forestry wastes are allowed to produce high value, wasting of biomass is reduced, and environmental pollution is avoided. The wave-absorbing material has the advantages of low material cost, no pollution in preparation and high product performance, accords with the concept of sustainable development,provides a scheme for resource utilization of the agricultural and forestry wastes, enriches the types of wave-absorbing materials, and provides technical support for promotion of the wave-absorbing materials.

Description

technical field [0001] The invention relates to a wave-absorbing material, in particular to a wave-absorbing material based on the reuse of agricultural and forestry wastes and a preparation method thereof. Background technique [0002] The rapid development of electronic equipment has brought many conveniences to people's lives, and microwaves are also playing an increasingly important role in people's lives, military affairs, aerospace and many other fields. However, with the extensive use of electronic equipment, excessive microwaves have become the fifth largest worldwide pollution after water pollution, air pollution, noise pollution and solid waste pollution. Excessive microwaves will not only affect the operation of precision instruments, interfere with communication and even cause air accidents, but also seriously endanger people's health and greatly increase the possibility of human beings suffering from leukemia, cancer and other terminal diseases. Therefore, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/348C01B32/324
CPCC01B32/348C01B32/324
Inventor 冯辉霞冯泽宇尚琼赵丹谭琳陈娜丽汪强强刘亚飞
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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