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A kind of preparation method of light graphene carbon foam

A graphene-carbon, graphene composite technology, applied in graphene, chemical instruments and methods, nano-carbon and other directions, can solve the problems of limited number of graphene exfoliation efficiency, high raw material price, limited adsorption capacity, etc., to achieve production The effect of controllable process and process conditions, low price and low equipment investment

Active Publication Date: 2021-08-24
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the raw materials are expensive, the cost is high, and the adsorption is pure oil, which does not show good adsorption performance in oil-water separation.
ZL.201310192786.7 combines cordierite minerals with foam carbon to prepare foam carbon / cordierite composite material, but its density is too high, the specific surface area is small, and the adsorption capacity is limited.
The above preparation methods have their own advantages. The key problem is that the exfoliation efficiency of graphite and the amount of graphene prepared are limited, and the cost is very high.

Method used

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  • A kind of preparation method of light graphene carbon foam
  • A kind of preparation method of light graphene carbon foam
  • A kind of preparation method of light graphene carbon foam

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Step 1: Prepare graphene composite rubber blocks by exfoliating graphite flakes from rubber

[0032] Add 100g of chloroprene rubber between the two rollers of the running double-roll mill, and knead for 1min. After the rubber is covered with the roll, add 70g of flake graphite powder with a diameter of 5mm, and knead and peel for 120min. Among them, when peeling for 20min , add diameter 0.5mm blowing agent ammonium oxalate 5g between the rollers; Continue to knead until predetermined time, make triangular bag 10 times during, thin pass, sheet, obtain uniform graphene-containing mass percent and be 40% chloroprene rubber Exfoliation of graphene mixed blocks;

[0033] Step 2 Carbonization of the graphene composite rubber block

[0034] Put 5 g of the neoprene exfoliated graphene mixed block obtained in step (1) into a 100mm×50mm porcelain boat, push it into a tube furnace that has been heated to 500°C, and heat up to 500°C at a heating rate of 15°C / min. At ℃, time, keep...

Embodiment 2

[0037] Step 1: Exfoliating expandable graphite crystals from rubber to prepare graphene composite rubber blocks

[0038] Add 50g of natural rubber and 50g of butadiene rubber between the two rollers of the double-roll mill in operation, knead for 1min, after the rubber is covered with rolls, add 5g of expandable graphite powder with a diameter of 0.5mm, knead and peel for 60min, Among them, when peeling for 10 minutes, 1 g of ammonium bicarbonate, a foaming agent with a diameter of 0.05 mm, was added between the rollers, and the kneading was continued until the predetermined time. 4.7% hybrid rubber exfoliated graphene oxide hybrid block; step 2 carbonization of graphene oxide composite rubber block

[0039] Put 5 g of the mixed rubber exfoliated graphene oxide mixed block obtained in step (1) into a porcelain boat of 100 mm × 50 mm, put it into a vacuum heating furnace that has been heated to 1000 ° C, turn on the vacuum pump, and keep the pressure in the furnace at 1000 Pa. ...

Embodiment 3

[0041] Step 1: Exfoliating expanded graphite crystals from rubber to prepare graphene composite rubber blocks

[0042] 100g of nitrile rubber is added between the two rolls of the double-roll mill in operation, kneaded for 1min, after the rubber is covered with rolls, add the expanded graphite powder on the 40g sieve, knead and peel for 90min, wherein, when peeling for 15min, Add 2.5 g of foaming agent urea with a diameter of 0.2 mm between the rollers, continue mixing until the predetermined time, during which the triangular bag is made 10 times, thinly passed, and the sheet is released to obtain a uniform nitrile rubber containing 28% by mass of graphene oxide Exfoliation of graphene oxide mixed blocks;

[0043] Step 2 Carbonization of the graphene composite rubber block

[0044] Put 5g of the nitrile rubber exfoliated graphene oxide mixed block obtained in step (1) into a 100mm×50mm porcelain boat, put it into a 900W microwave oven, start heating and timing, heat for 10min...

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Abstract

The invention is a preparation method of light graphene carbon foam. In this method, flake graphite, expanded graphite or expandable graphite are mixed together with the rubber matrix, so that the graphite flakes are peeled off and gradually uniformly dispersed in the matrix to form graphene or graphene oxide composite rubber blocks; at the same time, the rubber matrix In the process of exfoliating graphite, foaming material particles such as urea are added, and evenly mixed into graphene or graphene oxide composite rubber blocks; and then the composite rubber blocks are rapidly expanded by heating and roasting, and the rubber matrix is ​​decomposed and carbonized to form Lightweight graphene carbon foam material. The density of the graphene carbon foam that the present invention makes is less than 0.01g / cm 3 , and most of them are single-layer or few-layer graphene carbon foams, which have the advantages of low density, few defects, good thermal conductivity and electrical conductivity.

Description

technical field [0001] The invention relates to a method for preparing a graphene carbon foam material through high-temperature carbonization of exfoliated flake graphite by rubber mixing, and belongs to the field of preparation of new nanometer materials. Background technique [0002] Graphene is carbon atoms with sp 2 A single layer of hexagonal honeycomb structure formed by hybrid orbital connections, and a planar crystallized film composed of 2-10 layers of few layers of carbon atoms. The theoretical thickness of single-layer graphene is only 0.35nm, and the specific surface area is 2.63×10 3 m 2 / g, the Young's modulus is as high as ~1.0TPa, and the strength is 130GPa, which is 100 times that of steel, and it is the material with the highest strength known. The thermal conductivity of graphene reaches ~5000W / mK, the light transmittance is as high as ~97.7%, and the electron mobility is 2×10 5 cm 2 / vs. Graphene's unique 2D structure, excellent mechanical, electric...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/15C01B32/19C01B32/192
CPCC04B35/522C04B35/524C04B35/62605C04B38/0032C04B2235/442C04B2235/6562C04B2235/77C04B38/0067
Inventor 汤庆国黄彬刘乃旭梁秀红梁金生
Owner HEBEI UNIV OF TECH