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Rotary graphene stripping device, graphene production system and production method

A technology of peeling device and production system, applied in the field of graphene production, can solve the problems of fragmentation, limited shear force, and uneven pressure exerted by graphite, achieve good quality, reduce the probability of being pulverized, and maintain the natural plane size. Effect

Active Publication Date: 2015-03-11
江苏碳谷二维世界科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Among them, conventional grinding refers to grinding graphite in a mortar grinder. The disadvantages are: first, the shear force comes from the friction force caused by pressure, and the excessive pressure makes it difficult for the motor to drive the pestle body to rotate, which limits the shear force. If the pressure is too small, it is difficult to shear and peel off; secondly, the shearing efficiency is low, and increasing the amount of pressed powder will lead to insufficient shearing force of some powders; thirdly, the uneven pressure exerted by the pestle on the graphite is prone to overgrinding, and the Applying pressure to graphite will cause structural defects in graphene, and even shatter graphene after exfoliation, so that the obtained product has more "burrs" on the edges and small crystal size
[0010] During the research process, the inventors found that the main reason for the small size of the graphene obtained by the existing graphene peeling device is that the graphite is sheared in an unoriented direction, wherein the graphite layer is not parallel to the shear plane When it is sheared in the same way, the result tends to be that graphite is not sheared to exfoliate graphene, but graphite or graphene is crushed into smaller sizes
In addition, the reason for graphene fragmentation is that graphene is subjected to high-speed grinding during the stripping process, and the rotation speed reaches 2000rpm / min or even 12000rpm / min. High temperature and high heat generated by high-speed operation will oxidize graphene, and graphene will produce defects or even fragmentation. , which in turn affects the quality of the exfoliated graphene

Method used

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  • Rotary graphene stripping device, graphene production system and production method
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  • Rotary graphene stripping device, graphene production system and production method

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Embodiment 1

[0047] The present invention relates to a rotary graphene stripping device 1 and a graphene production system, and also relates to a graphene production method.

[0048] The graphene production system, such as figure 1 As shown, along the process sequence, the rotary graphene stripping device 100, the storage tank 200, the centrifuge 300, the vacuum filter unit 400 and the freeze drying device 500 are successively included; the storage tank 200 is used for collecting and standing the rotary graphene stripping After the device 100 is processed, the product is discharged. The centrifuge 300 is used to centrifuge the upper layer suspension in the storage tank 200 to separate exfoliated graphene and unexfoliated graphite. The vacuum filter device 400 is used to centrifuge the supernatant obtained by the centrifuge 300. Filtration and washing are performed, and the freeze-drying device 500 is used to dry the graphene after vacuum filtration. Here, the discharge port 6 of the rotar...

Embodiment 2

[0052] In Example 1, the gradual exfoliation of graphene will cause the volume expansion of the suspension. If the gap between the inner cylinder 11 and the rotating cylinder 1 is designed to increase axially downward, although the volume expansion requirement of the suspension can be satisfied, the shearing and grinding effects will be weakened.

[0053] Different from Embodiment 1, the rotary graphene peeling device 100 in this embodiment, such as image 3 As shown, the lower part of the inner cylinder 11 is a truncated cone with the cone angle upward, and the upper part of the inner cylinder 11 is conical; the rotating cylinder 1 is in the shape of a truncated cone with the cone angle upward. By designing the rotary cylinder 1 with the cone angle facing upward and the lower part of the inner cylinder 11 matched with the lower part of the rotary cylinder, the capacity of the suspension that can be accommodated per unit height between the inner cylinder 11 and the rotary cyli...

Embodiment 3

[0055] In Example 1, the gradual exfoliation of graphene will cause the volume expansion of the suspension. If the gap between the inner cylinder and the rotating cylinder is designed to increase in the axial direction, although the increase in volume required by the volume expansion of the suspension can be met, the shearing and grinding effects will be weakened.

[0056] Different from Embodiment 1, the rotary graphene peeling device 100 in this embodiment, such as Figure 4 As shown, the inner cylinder 11 is conical with the cone angle facing upwards; the middle and lower part of the rotary cylinder 1 is in the shape of a truncated cone, and the upper part of the rotary cylinder 1 is cylindrical. By designing the middle and lower part of the rotary cylinder 1 with the cone angle facing upwards and the inner cylinder 11 matched with the middle and lower part of the rotary cylinder, the unit height between the inner cylinder 11 and the rotary cylinder 1 can accommodate the su...

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Abstract

The invention discloses a rotary graphene stripping device including a rotary cylinder body; a top cover is arranged above the rotary cylinder body, a bottom cover is arranged below the rotary cylinder body, the top of the top cover is provided with a feed inlet, the bottom of the bottom cover is provided with a discharge port, and the feed inlet is communicated with the interior of the rotary cylinder body; the outer side of the rotary cylinder body is provided with a first motor, and is used for driving the rotary cylinder body to horizontally rotate; the rotary cylinder body is also internally provided with an inner cylinder, and a second motor used for driving the inner cylinder to horizontally rotate in a direction opposite to the rotating direction of the rotary cylinder body is arranged below the rotary cylinder body; the upper part of the inner cylinder is shrunk in a certain angle, and a material storage space is left between the upper part of the inner cylinder and the upper part of the rotary cylinder body; the lower part of the inner cylinder and the lower part of the rotary cylinder body are in clearance fit to be used for grinding graphite sheets, and a clearance between the lower part of the inner cylinder and the lower part of the rotary cylinder body is successively decreased downward along the axial direction of the rotary cylinder body. The rotary graphene stripping device can achieve successful stripping of graphene. The invention also relates to a graphene production system containing the rotary graphene stripping device and a graphene production method.

Description

technical field [0001] The invention relates to the technical field of graphene production, in particular to a device for peeling off rotary graphene and a graphene production system, and also to a graphene production method. Background technique [0002] Graphene is a sheet-like two-dimensional material in which carbon atoms are represented by sp 2 The hybrid orbitals form a hexagonal honeycomb lattice structure. This special two-dimensional structure causes graphene to exhibit various special properties, such as high strength, high hardness, high thermal conductivity and electrical conductivity; due to these structural characteristics and performance characteristics, graphene is known as the Layers, transparent bendable electronic components, ultra-large capacitors, etc. are the most promising potential materials. What needs to be added is that, strictly speaking, graphene is a single-layer sheet; however, due to the difficulty of preparing single-layer graphene, oligola...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04
Inventor 戴加龙
Owner 江苏碳谷二维世界科技有限公司
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