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A kind of preparation method of porous carbon microwave absorber using yeast as pore-forming agent

A technology of microwave absorber and pore-forming agent, which is applied in the direction of carbon preparation/purification, sustainable manufacturing/processing, and climate sustainability. It can solve the problems of demanding carbon source materials and complex processes, and achieve environmental protection and friendliness. , simple process and rich pore structure

Active Publication Date: 2022-08-09
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the template method can obtain porous carbon with uniform pore distribution, the process is complicated and the requirements for carbon source materials are relatively strict.
Although the foaming method cannot obtain porous carbon with uniform openings like the template method, its preparation process is simple, and the substances used as carbon sources are widely distributed, such as: mesophase pitch, resin and sucrose, etc.

Method used

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  • A kind of preparation method of porous carbon microwave absorber using yeast as pore-forming agent
  • A kind of preparation method of porous carbon microwave absorber using yeast as pore-forming agent
  • A kind of preparation method of porous carbon microwave absorber using yeast as pore-forming agent

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Embodiment 1

[0028] In this embodiment, the preparation method of the porous carbon microwave absorber comprises the following steps:

[0029] Step 1: Activation of dry yeast powder: Measure 50ml of deionized water in a beaker, put it in a 30°C water bath and heat it for later use; weigh 0.3g of dry yeast powder, pour it into the above deionized water, and stir with a glass rod Until the dry yeast powder is completely dispersed in the water; keep it in a water bath at 30°C for 0.5h to fully stimulate the activity of the yeast;

[0030] Step 2: Preparation of carbonized raw materials: Weigh 100 g of flour into a large beaker, pour the above-mentioned 50 ml of the yeast-dispersed aqueous solution into the flour and stir evenly. After kneading the wet flour containing yeast into dough, put it in a beaker, seal it with plastic wrap, and ferment it at a constant temperature of 40°C in a drying oven for 1 hour; cut the fermented dough into small pieces and dry it in a drying oven at 120°C Dry f...

Embodiment 2

[0034] In this embodiment, the preparation method of the porous carbon microwave absorber comprises the following steps:

[0035] Step 1: Activation of dry yeast powder: Measure 50ml of deionized water in a beaker, put it in a 40°C water bath and heat it for later use; weigh 0.5g of dry yeast powder, pour it into the above deionized water, and stir with a glass rod Until the dry yeast powder is completely dispersed in the water; keep it in a water bath at 40°C for 0.5h to fully stimulate the activity of the yeast;

[0036] Step 2: Preparation of carbonized raw materials: Weigh 100 g of flour into a large beaker, pour the above-mentioned 50 ml of the yeast-dispersed aqueous solution into the flour and stir evenly. After kneading the wet flour containing yeast into dough, put it in a beaker, seal it with plastic wrap, and ferment it at a constant temperature of 40°C in a drying oven for 1 hour; cut the fermented dough into small pieces and dry it in a drying oven at 100°C Dry f...

Embodiment 3

[0040] In this embodiment, the preparation method of the porous carbon microwave absorber comprises the following steps:

[0041] Step 1: Activation of dry yeast powder: Measure 60ml of deionized water in a beaker, put it in a 35°C water bath and heat it for later use; weigh 0.3g of dry yeast powder, pour it into the above deionized water, and stir with a glass rod Until the dry yeast powder is completely dispersed in the water; keep it in a water bath at 35°C for 1h to fully stimulate the activity of the yeast;

[0042]Step 2: Preparation of carbonized raw materials: Weigh 120 g of flour into a large beaker, pour the above-mentioned 60 ml of the yeast-dispersed aqueous solution into the flour and stir evenly. After kneading the wet flour containing yeast into dough, put it in a beaker, seal it with plastic wrap, and ferment it in a drying oven at a constant temperature of 35°C for 1 hour; cut the fermented dough into small pieces and dry it in a drying oven at 110°C Dry for ...

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Abstract

The invention belongs to the field of electromagnetic wave absorbing materials, and in particular relates to a preparation method of a porous carbon microwave absorbing agent using yeast as a pore-forming agent. Using flour as a carbon source, a porous carbon material with excellent wave-absorbing properties was prepared by microbial yeast fermentation pore-making and high-temperature carbonization processes. The method specifically includes the following steps: flour, yeast and water are uniformly mixed into a dough in a certain proportion, fermented at a constant temperature, and dried; the dried dough is pre-carbonized in an inert atmosphere; the porous carbon obtained after the pre-carbonization is broken, and well-developed pores are screened out. The particles were carbonized at different temperatures in an inert atmosphere to obtain a porous carbon microwave absorbent. The porous carbon microwave absorber of the invention has rich pore structure, large specific surface area, large dielectric constant and strong loss to electromagnetic waves. The raw materials used in the invention are easy to obtain, the preparation method is environmentally friendly, the process is simple, the preparation cost is low, and is suitable for industrial production.

Description

technical field [0001] The invention belongs to the field of electromagnetic wave absorbing materials, in particular to a preparation method of a porous carbon microwave absorbing agent using yeast as a pore-forming agent. Background technique [0002] The ideal absorbing material should have the characteristics of wide absorption frequency band, light weight, thin thickness, good physical and mechanical properties, and easy to use. It is difficult for a single-component structural material to meet the above characteristics at the same time, so it is extremely important to develop a light-weight, high-absorption electromagnetic wave absorber. Porous carbon, as a dielectric loss absorbent, has the advantages of light weight, large specific surface area, and large dielectric constant, and has a good application prospect in the field of electromagnetic wave absorbers. [0003] The methods of preparing porous carbon materials can be roughly divided into two categories: template...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/05H05K9/00
CPCC01B32/05H05K9/0081Y02P20/10
Inventor 祖亚培沈章涛陈育秋杨文进宫骏孙超
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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