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A kind of method that prepares graphene with steam explosion method

A graphene and graphene solution technology, which is applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve the problems of long preparation time, harsh reaction conditions, and high raw material costs, and achieve short preparation time, simple operation, low cost effect

Inactive Publication Date: 2017-03-22
湖南元素密码石墨烯高科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, low production capacity and unstable quality of graphene are common at home and abroad. Most graphene is prepared by chemical methods, which has a great impact on the performance of graphene. At the same time, there are serious environmental pollution, high raw material costs, harsh reaction conditions, and low output Low-level problems, not very practical
[0004] CN201310262842.X discloses a method for preparing graphene by foaming expansion method, which adopts graphene / polyurethane composite material to prepare graphene, and the preparation process does not use strong oxidizing and strong irritating substances; however, the method operation introduces new Chemical substances increase costs and take a long time to prepare, which is not conducive to rapid industrial production

Method used

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  • A kind of method that prepares graphene with steam explosion method
  • A kind of method that prepares graphene with steam explosion method
  • A kind of method that prepares graphene with steam explosion method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Graphene oxide is prepared in a reactor. Such as figure 1 As shown: the reaction kettle includes a container body 1, the upper side of the container body 1 is provided with a feeding port 11, the bottom is provided with a discharge port 12, the middle part is provided with a motor 2, the lower part of the motor 2 is installed with a rotor 3, and the outer side of the rotor 3 A stator 4 is installed. Through the high-speed centrifugation of the rotor 3, the graphite can be quickly peeled off to prepare graphene oxide, which shortens the preparation time.

Embodiment 2

[0035] Graphene is produced in a steam explosion relief valve. Such as figure 2 As shown: the steam explosion pressure relief valve includes a valve seat 5, a valve body 6 and a valve cover 7 installed sequentially from bottom to top, a heating base 8 is provided between the valve seat 5 and the valve body 6, and above the heating base 8 Piston-type valve disc 61, piston-type valve disc 61 is connected with valve rod 62, and the end of valve rod 62 passes through valve body 6 and valve cover 7 and is connected with compression spring 9.

[0036] when working, such as image 3 As shown: the steam explosion pressure relief valve pumps the graphene oxide solution from the inlet of the heating base 8, obtains high temperature and high pressure through heating, and then pushes the piston valve disc 61 to move upward, and the valve stem 62 bends the compression spring 9; The pressure expansion peels off the graphene sheets, and after they are completely removed, the gas outlet of...

Embodiment 3

[0043] The difference between this example and Example 1 is: control the heating rate at 6°C / min to 9°C / min, raise the temperature to 350°C to 400°C, and keep the temperature for 3h to 5h. Others are the same as in Example 1.

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Abstract

A method for preparing graphene by means of a steam explosion method comprises the following steps of 1 using graphene to prepare oxidized graphene, 2 mixing the prepared oxidized graphene and dispersion liquid and performing ultrasonic dispersion and stirring to obtain an oxidized graphene solution; 3 arranging the oxidized graphene solution in a steam explosion pressure relief valve, controlling temperature rising rate to be 5 DEG C / min-15 DEG C / min, rising the temperature to be 300 DEG-500 DEG C, keeping the temperature for 2-10 hours and then instantly releasing pressure to obtain a reaction product; 4 washing and drying the reaction product to obtain the graphene. The method is simple in operation, short in preparation time, free of pollution, low in cost and high in yield, can be used for lithium battery electrode materials and lubricating materials, can be also used for medicine, catalysis or special spraying materials and can be directly used as or synthesized into an abrasion-resisting material for an engine air cylinder.

Description

technical field [0001] The invention relates to the field of graphene materials, in particular to a method for preparing graphene by a steam explosion method. Background technique [0002] Graphene is a carbon atom with sp 2 The hybrid orbitals form a hexagonal planar film with a honeycomb lattice, a two-dimensional material with a thickness of only one carbon atom, and is the thinnest and hardest nanomaterial known in the world. It is almost completely transparent, absorbing only 2.3% of light; its thermal conductivity is as high as 5300 W / m K, which is higher than that of carbon nanotubes and diamonds, and its electron mobility exceeds 15000 cm at room temperature. 2 / V·s, which is higher than that of carbon nanotubes or silicon crystals, and the resistivity is only about 10 -8 Ω·cm, lower than copper or silver, is the material with the smallest resistivity in the world, especially with a large theoretical specific surface area of ​​2630m 2 / g. [0003] Graphene has h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/192
Inventor 谭彬楚增勇龙笃湘白毅
Owner 湖南元素密码石墨烯高科技有限公司