CN-122010112-A - Peanut residue biomass charcoal microwave shielding material and preparation method thereof

CN122010112ACN 122010112 ACN122010112 ACN 122010112ACN-122010112-A

Abstract

The invention relates to the technical field of microwave shielding materials, in particular to a biomass charcoal microwave shielding material for peanut residues, which is prepared by taking waste peanut residues as raw materials through high-temperature pyrolysis and sodium hydroxide activation, wherein the biomass charcoal with high purity and rich pores is prepared by taking the residual peanut residues after grease and protein removal as raw materials, is beneficial to reducing nitrogen, phosphorus, magnesium and other miscellaneous elements, avoiding generating inorganic salts of magnesium, potassium and the like, and simultaneously effectively increasing the number of holes through the coordination of the three aspects of high-temperature pyrolysis, sodium hydroxide dispersion and sodium hydroxide continuous activation so as to enhance the microwave absorption loss. The invention also discloses a method for preparing the microwave loss coating by using the peanut residue biomass charcoal, which is characterized in that the prepared biomass charcoal material is mixed with paraffin, epoxy resin or silicone rubber matrix, the mixing mass ratio is 1:1, and the microwave loss is relatively strong in the range of 2-18 GHz through test.

Inventors

WEI LIN
HE CHONGKANG
LIU XING
CHENG LICHUN
ZHAO LIANGJIN

Assignees

贺州学院

Dates

Publication Date: 20260512
Application Date: 20251209

Claims (5)

1. The peanut residue biomass charcoal microwave shielding material is characterized in that the preparation method of the peanut residue biomass charcoal microwave shielding material comprises the following steps: (1) Collecting peanut residues after grease and protein removal, cleaning the peanut residues with alcohol and deionized water in sequence, and drying in an electrothermal constant-temperature blast drying oven; (2) Mixing the dried peanut residues with sodium hydroxide powder, and rapidly grinding to obtain a solid mixture; (3) Placing the solid mixture obtained in the step (2) into a tubular furnace, and continuously introducing argon to perform high-temperature pyrolysis under the condition of isolating oxygen; (4) After pyrolysis, taking out the product, washing and filtering the product for a plurality of times by using distilled water until the solution is neutral, and collecting the wet product after filtration; (5) And drying the collected wet product to obtain the biomass charcoal microwave loss material.
2. The peanut residue biomass charcoal microwave shielding material according to claim 1, wherein the drying condition in the step (1) is 10 h dried at 160 ℃.
3. The peanut residue biomass charcoal microwave shielding material according to claim 2, wherein the mixing ratio of the peanut residue to the sodium hydroxide in the step (2) is 1:1 by mass.
4. The peanut residue biomass charcoal microwave shielding material according to claim 3, wherein the pyrolysis condition in the step (3) is 2h heated at 700 ℃.
5. A method for preparing a microwave loss pattern layer by using the peanut residue biomass charcoal microwave shielding material according to claim 4, wherein the prepared peanut residue biomass charcoal is mixed with a matrix, the mixing mass ratio is 1:1, and the matrix is one of paraffin, epoxy resin or silicone rubber.

Description

Peanut residue biomass charcoal microwave shielding material and preparation method thereof Technical Field The invention relates to the technical field of microwave shielding materials, in particular to a biomass charcoal microwave high-loss shielding material prepared from waste peanut residues and a method thereof. Background With the development of industry, development and utilization of clean energy have been urgent. Biomass energy has become the fourth largest energy source next to coal, oil, and natural gas. Biomass refers to all organic matters for photosynthesis by directly or indirectly utilizing green plants, including all plants, animals, microorganisms and excretions and metabolites produced by the organisms, has the characteristics of being renewable, degradable, clean and various, and is a very important renewable energy source. In modern life with fast pace, more and more waste residues are produced, however, the waste residues are a challenge to our environment, and we should want to use the waste residues, change waste into valuable and protect the environment. With the continuous development of technology, the number of electronic products in life is increasing, and the frequency of use is also increasing. The number of harassment sources is continuously increased, meanwhile, electronic technology products are sensitive devices, great challenges are brought to electromagnetic compatibility among products or systems, excessive electromagnetic radiation can influence normal physical health of people, physiological dysfunction is caused, even life is threatened, and information safety, information leakage and the like caused by the electromagnetic radiation in the military field also put higher requirements on military defense technology. For this reason, development of functional materials having high loss and high absorption is required. For this reason, many researchers have proposed the use of biomass to produce wave-absorbing materials. The publication (bulletin) No. CN118239780A discloses a preparation method of a biomass carbon ultra-wideband microwave absorbing material, which is a mixed heating technology of microwave/microwave-carbon co-excited plasma to prepare biomass carbon with enhanced conduction loss and polarization loss, specifically, a cellulose carbon precursor is obtained by heating a cellulose program, and then the cellulose carbon precursor is subjected to microwave heating to finally obtain the biomass carbon, but the preparation method lacks an accurate regulation mechanism, so that the wave absorbing material with expected specific electromagnetic parameters is difficult to prepare. The fruit biomass contains a large amount of protein and grease, if the fruit biomass is directly used as a carbon source, a large amount of nitrogen, phosphorus and other hetero atoms are brought by high-temperature pyrolysis, the purity of the obtained biomass charcoal is reduced, the electromagnetic parameters of the biomass charcoal material are difficult to accurately regulate and control, and the precise assembly of the microwave absorbing material is not facilitated. In the beverage industry, peanut protein milk is more and more paid attention to in recent years, especially the production of peanut protein beverage is protruding in the military, mainly including peanut milk, peanut yoghurt and the like, in the production of peanut protein beverage, a large amount of peanut residues are generated after peanut is ground into pulp, and the rest peanut residues are usually sold as feed at a low price of 0.1 yuan/kg, so that the utilization rate is not high. In the food oil industry, peanut oil is also becoming increasingly popular with consumers, and a large amount of residue is produced during the peanut oil preparation process. These peanut residues are either discarded or used as fertilizer, and have extremely low utility value. Disclosure of Invention Based on the problems, the invention aims to provide a peanut residue biomass charcoal microwave shielding material prepared from waste peanut residues, which is characterized by comprising the following steps: (1) Collecting peanut residues after grease and protein removal, cleaning the peanut residues with alcohol and deionized water in sequence, and drying in an electrothermal constant-temperature blast drying oven; (2) Mixing the dried peanut residues with sodium hydroxide powder, and rapidly grinding to obtain a solid mixture; (3) Placing the solid mixture obtained in the step (2) into a tubular furnace, and continuously introducing argon to perform high-temperature pyrolysis under the condition of isolating oxygen; (4) After pyrolysis, taking out the product, washing and filtering the product for a plurality of times by using distilled water until the solution is neutral, and collecting the wet product after filtration; (5) And drying the collected wet product to obtain the peanut residue biomass charcoal microwave loss materi