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A kind of preparation method of low thermal expansion reduced graphene oxide

A low-expansion, graphene technology, applied in the direction of graphene, nano-carbon, etc., can solve the problems of low density and high expansion of graphene oxide, and achieve the effect of low expansion rate, inhibition of volume expansion, and convenient use.

Active Publication Date: 2021-07-09
XIAMEN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art, to provide a method for preparing graphene oxide with low thermal expansion, which solves the problems of high expansion and low density of graphene oxide in the above-mentioned background technology

Method used

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  • A kind of preparation method of low thermal expansion reduced graphene oxide
  • A kind of preparation method of low thermal expansion reduced graphene oxide
  • A kind of preparation method of low thermal expansion reduced graphene oxide

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Experimental program
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Embodiment 1

[0022] A kind of preparation method of low expansion heat reduced graphene oxide of the present embodiment, comprises the steps:

[0023] Graphite oxide powder was obtained by Hummers method, Brodie method, Staudenmaier method or electrochemical oxidation method; 10g graphite oxide powder was mixed with 10g potassium bromide powder and 10g ethanol; the mixture was heated at 800°C for 10 hours, The heated product is washed with water and dried; the dried product is ball-milled at a ball milling speed of 100 rpm for 8 hours to obtain reduced graphene oxide with low heat of expansion; the reduced graphene oxide with low heat of expansion is micron-sized Single-layer or few-layer graphene powder, the bulk density is 0.02~0.20g·cm -3 .

[0024] Such as figure 1 , both have a mass of 1.0 g, and the volume of the reduced graphene oxide (A) prepared in this example is significantly smaller than that of the reduced graphene oxide (B) prepared by a common thermal reduction method.

...

Embodiment 2

[0029] The difference between embodiment 2 and embodiment 1 is: 10g of graphite oxide powder, 10g of magnesium chloride powder, and 10g of ethanol are mixed evenly. After thermal reduction treatment at 800° C. for 10 hours, washing with water and drying, ball milling at a ball milling speed of 100 rpm for 6 hours to obtain low-expansion heat-reduced graphene oxide.

Embodiment 3

[0031] The difference between embodiment 3 and embodiment 1 is: 10g of graphite oxide powder, 40g of potassium chloride powder, and 20g of ethanol are mixed evenly. After thermal reduction treatment at 900° C. for 5 hours, washing with water and drying, ball milling at a ball milling speed of 200 rpm for 5 hours to obtain low-expansion heat-reduced graphene oxide.

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Abstract

The invention discloses a preparation method of low-expansion thermally reduced graphene oxide. The preparation method includes the following steps: oxidizing graphite to obtain graphite oxide; uniformly mixing graphite oxide, inorganic salt and ethanol in a mass ratio of 1:1-8:0.5-5, and the inorganic salt is sodium chloride , at least one of potassium chloride, calcium chloride, magnesium chloride, sodium sulfate or potassium bromide; heat treatment at 400 to 1100 ° C for 1 to 10 hours, and the heated product is washed with water and dried; For 0.5 to 8 hours, the rotational speed of the ball mill is 100-500 rpm to obtain low-expansion thermally reduced graphene oxide; the prepared low-expansion thermally reduced graphene oxide can effectively reduce the friction coefficient of the grease when used in grease, Improve performance.

Description

technical field [0001] The invention relates to a preparation method of reduced graphene oxide with low thermal expansion. Background technique [0002] At present, the preparation methods of graphene mainly include mechanical exfoliation method, vapor phase deposition method and redox method. The mechanical exfoliation method is to peel off the natural graphite along the interlayer through mechanical actions such as ball milling, ultrasound, and shearing, to obtain graphene powder. The process is simple, the pollution is small, and the output is large. However, the peeling efficiency of the mechanical exfoliation method is relatively low, and the product is mainly composed of multilayer graphite microflakes, and the internal layers of the microflakes are closely arranged, similar to graphite raw materials. The vapor deposition method is to deposit a graphene film on the surface of a metal or an inorganic substance through a chemical reaction. The product is usually a larg...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/184
CPCC01B32/184
Inventor 白华胡晓兰钱卫华池航陈德富邓华清刘宁奇
Owner XIAMEN UNIV