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Method for preparing biomass conductive charcoal electromagnetic shielding material

An electromagnetic shielding material and biomass technology, applied in chemical instruments and methods, carbon compounds, inorganic chemistry, etc., can solve the problems of high cost and limited resources, and achieve low manufacturing costs, large resources, and improved utilization grades. Effect

Inactive Publication Date: 2013-08-28
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional metal-based electromagnetic shielding materials have high cost and limited resources, and it is difficult to meet the growing market demand. Researchers have been actively looking for cheaper, environmentally friendly and resource-rich electromagnetic shielding materials

Method used

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  • Method for preparing biomass conductive charcoal electromagnetic shielding material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The first step is to use iron ferric oxide as the main catalyst, calcium carbide as the catalytic auxiliary agent, and mix the main catalyst and the auxiliary catalyst according to the mass ratio of 1:0.5 to form a catalyst;

[0031] In the second step, after removing the impurities in the rice straw, the rice straw is crushed and screened into granular particles with a particle size of 1mm, and sent into the carbonization furnace, heated to 480°C at a heating rate of 1°C / min for low-temperature carbonization, and the temperature is maintained at 0.5 h, cooling;

[0032] In the third step, the biomass conductive carbon obtained by low-temperature carbonization is taken out from the furnace, and the biomass conductive carbon and the catalyst are mixed evenly in a mass ratio of 50:1;

[0033] In the fourth step, the biomass conductive carbon mixed with the catalyst is used as a raw material for high-temperature carbonization, and it is sent into a carbonization furnace, h...

Embodiment 2

[0039] In the first step, nickel acetate is used as the main catalyst, calcium carbide is used as the catalyst promoter, and the catalyst is configured by mixing the main catalyst and the promoter according to the mass ratio of 1:4;

[0040] In the second step, after the impurities in the straw are removed, the wheat straw is crushed and screened into granular particles with a particle size of 15mm, and sent into the carbonization furnace, heated to 520°C at a heating rate of 30°C / min for low-temperature carbonization, and maintained at this temperature Temperature 10h, cooling;

[0041] In the third step, the biomass conductive carbon obtained by low-temperature carbonization is taken out from the furnace, and the biomass conductive carbon and the catalyst are mixed evenly in a ratio of 200:1 by mass;

[0042] In the fourth step, the biomass conductive carbon mixed with the catalyst is used as a raw material for high-temperature carbonization, and it is sent into a carbonizat...

Embodiment 3

[0048] In the first step, iron oxide is used as the main catalyst, calcium oxide is used as the catalyst promoter, and the catalyst is configured by mixing the main catalyst and the promoter according to the mass ratio of 1:2;

[0049] In the second step, after removing the impurities in the corn stalks, crush the corn stalks and screen the granular particles with a particle size of 8mm, send them into the carbonization furnace, heat them to 500°C at a heating rate of 15°C / min for low-temperature carbonization, and maintain this temperature 5h cooling;

[0050] In the third step, the biomass conductive carbon obtained by low-temperature carbonization is taken out from the furnace, and the biomass conductive carbon and the catalyst are mixed evenly in a ratio of 100:1 by mass;

[0051] In the fourth step, the biomass conductive carbon mixed with the catalyst is used as a raw material for high-temperature carbonization, and it is sent into a carbonization furnace, heated to 900°...

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Abstract

The invention discloses a method for preparing a biomass conductive charcoal electromagnetic shielding material. The method comprises the following steps of: firstly, using a nickel-based or iron-based compound as a main catalyst and using a calcium-based compound as a cocatalyst to prepare a catalyst, then low-temperature carbonizing biomass conductive charcoal under 480-520 DEG C, cooling and taking out the catalyst and the biomass conductive charcoal, fully mixing the catalyst and the biomass conductive charcoal, high-temperature carbonizing the biomass conductive charcoal under 800-1000 DEG C, and further pretreating the biomass conductive charcoal, to obtain final biomass conductive charcoal. After the biomass conductive charcoal, a resin and a solvent are uniformly mixed according to a mass ratio of 4-10: 1:1-3, a mixture liquid is poured into a stainless steel die with thickness being 1-15mm, the mixture liquid is cured and formed under a constant pressure of 1-20MPa for 0.5-5h, and then the biomass electromagnetic shielding material is obtained after demolded. The method for preparing the electromagnetic shielding material has advantages of good adaptability on raw materials, stable quality and large potential.

Description

technical field [0001] The invention relates to a preparation method of an electromagnetic shielding material, in particular to a preparation method of a biomass conductive carbon electromagnetic shielding material. Background technique [0002] Biomass is a typical renewable resource, and the carbon fixed by plants through photosynthesis is as high as 2×10 11 t, the energy is 3×10 21 J, The solar energy stored in plants through photosynthesis every year can provide the world's energy needs for 10 years. As a renewable resource, plants have been widely used because of their uniform distribution, green environmental protection, and no increase in greenhouse gases. The research and development of its application method has become one of the world's major hot topics, and has attracted extensive attention from governments and scientists from various countries. According to the statistics of the United Nations Environment Program (UNEP), the straw produced by various crops...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/08C01B32/318C01B32/324
Inventor 肖刚倪明江骆仲泱高翔岑可法方梦祥周劲松施正伦程乐鸣王勤辉王树荣余春江
Owner ZHEJIANG UNIV
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