CN113684464B - Winding type equipment for preparing graphene composite film - Google Patents

Abstract

The invention discloses a winding device for preparing graphene composite films, which mainly includes a chamber, an evaporation module, a coating module and a pattern generating roller; the evaporation module deposits a catalyst film layer on the surface of a flexible base film through vacuum evaporation coating. The coating module coats the graphene composite material on the catalyst film layer to form a coating layer; the coating layer catalyzes and grows into a graphene composite wet film layer under the action of the catalyst under the coating layer. The pattern generation roller partially removes the unformed wet film layer on the flexible base film passing through the pattern generation roller through negative pressure absorption, thereby forming a graphene composite film with a specific pattern on the flexible base film. The pattern generating roller includes an inner roller and an outer roller; the outer roller is arranged with a mesh array; the inner roller is arranged with an array of absorption holes, and the absorption holes and the mesh are connected through an absorption pipe; the inner roller is a cavity structure, and the end of the inner roller The part is connected with the low vacuum pump, and the low vacuum pump pumps the interior of the inner roller into a negative pressure relative to the air pressure in the chamber.

Description

A winding device for the preparation of graphene composite film

technical field

The invention belongs to the technical field of graphene composite film preparation, and in particular relates to a winding device for preparing graphene composite film.

Background technique

As a new nanomaterial, graphene has higher specific surface area, strength, thermal conductivity and electrical conductivity than traditional materials. At present, adding graphene to existing materials to make graphene composite materials to improve the performance of raw materials has become a hot spot in current research and application. Among many graphene composite materials, graphene-silicone rubber composite materials have excellent mechanical, thermal and electrical properties, and have good application prospects in the aerospace field. Silicone rubber is an elastic polymer with both inorganic and organic properties with Si-O-Si bonds as the main chain and organic groups as side chains. Due to the weak molecular chain interaction, it is difficult to generate freely moving electrons, and in Aging and decomposition will occur at high temperature. The strength of silicone rubber is low and it is almost non-conductive. The tensile strength of unreinforced silicone rubber is only 0.3MPa. Ordinary silicone rubber materials can only be used safely within 260°C, and their application value is limited. In order to overcome the shortcomings of silicone rubber in terms of strength and electrical conductivity, and further improve high-temperature resistance, many researchers have doped a variety of graphene into it to improve the strength, heat resistance, and electrical conductivity of silicone rubber to meet the needs of space exploration. Strict requirements for the performance of silicone rubber materials.

However, the current preparation process of graphene-silicone rubber composite materials is relatively complicated, and most of them remain in the laboratory stage, making it difficult to realize industrialization. In particular, the recently proposed graphene-silicone rubber composite flexible film material can be widely used in more fields due to its lightness, flexibility, and changeable shape. Promotion and application of materials.

Contents of the invention

The invention proposes a roll-to-roll type graphene composite film preparation equipment, which meets the large-scale production equipment and technical requirements of flexible graphene-silicon rubber composite film materials represented by flexible graphene composite film.

The invention provides a winding-type equipment for the preparation of graphene composite films, which mainly includes a chamber, an evaporation module, a coating module, a shaping module and a winding system; the winding system includes an unwinding roller, a winding roller, an evaporation The main roller and the pattern generating roller; the chamber is divided into an evaporation working area and a non-evaporating working area by a partition, and the evaporation module is set in the evaporation working area; the pattern generating roller is arranged between the coating module and the sizing module; the pattern generating roller Partially remove the unformed wet film layer on the flexible base film wound around the pattern generating roller by negative pressure absorption, so as to form a graphene composite film with a specific pattern on the flexible base film.

The chamber is provided with a vacuum system and an inflation system; the vacuum system is used to create a clean vacuum environment in the chamber, and the inflation system is used to charge the working gas. Before the graphene composite film is prepared, the gas in the chamber is first pumped out through the vacuum system, so that the vacuum degree in the chamber reaches above 10Pa (that is, the pressure reaches below 10Pa), and then the non-evaporative working area in the chamber is ventilated through the inflation system. Inject the working gas required for preparing the graphene composite film, and control the gas pressure in the non-evaporative working area in the chamber within the range of 0.01MPa~0.1MPa. The evaporating main roller is arranged across the evaporating working area and the non-evaporating working area, and the gap between the separator and the surface of the evaporating main roller is in the range of 1-5mm. The chamber is also provided with pressure gauges, hygrometers and temperature gauges for measuring environmental parameters.

The evaporation main roll is located downstream of the unwinding roll and upstream of the coating module; the evaporation module is located below the evaporation main roll, and is used to deposit a catalyst film layer on the surface of the flexible base film by vacuum evaporation coating.

A pattern generating roller is arranged downstream of the coating module. The pattern generating roller is a double-layer mechanism, including an inner roller and an outer roller; the roller surface of the outer roller is a mesh structure with a mesh array arranged on it; the roller wall of the inner roller is arranged with an array of absorption holes, and the absorption holes in the array of absorption holes The meshes in the mesh array are connected by absorption pipes, and the absorption holes correspond to the meshes one by one; the inside of the inner roller is a cavity structure, and the end of the inner roller is connected with a low-vacuum pump, and the low-vacuum pump pumps the inner roller Pump down to a negative pressure relative to the air pressure in the chamber.

The inner side of the roller wall of the inner roller is provided with a masking tube slot; a masking tube can be inserted into the masking tube slot, and the unfolded shape of the masking tube corresponds to the specific pattern of the graphene composite film to be formed on the flexible base film; the masking tube Cover and seal some of the absorbing holes in the array of absorbing holes on the roller wall from the inner side of the inner roller wall; when the pattern generating roller is working, the continuous and stable negative pressure of the inner roller will pass through the unblocked absorbing holes through the connected The suction ducts and meshes create negative pressure suction on the wet film layer overlying these mesh holes, thereby removing this portion of the wet film layer on the flexible base film wound around the pattern forming roller.

By controlling the exhaust speed of the low vacuum pump, the negative pressure absorption strength of the pattern forming roller to the wet film layer can be adjusted, and the part of the wet film layer covering the mesh can be completely or partially removed.

In one embodiment, the pattern generating roller also includes a controller; an electric control valve is arranged on the absorption pipeline; after the controller receives the pattern generation instruction, it turns on the electric control valves on some absorption pipelines according to the preset pattern generation program. Valves, the negative pressure of the inner roller will generate negative pressure absorption from these absorption pipes through the absorption holes and meshes connected to them to the wet film layer covered on these meshes, so as to flow on the flexible base film of the pattern generation roller This part of the wet film layer is removed. The controller can individually adjust the opening of the electronically controlled valves on some absorption pipes to individually control the negative pressure absorption of the wet film layer by the controlled meshes connected to these absorption pipes, so as to control the negative pressure absorbed by the controlled meshes. The wet film layer on the surface is completely or partially removed. The controller controls the negative pressure absorption strength of the wet film layer by a plurality of adjacent meshes respectively, so that the negative pressure absorption strength of these adjacent meshes forms a gradual trend, so that the covering on these adjacent meshes The wet film layer forms a groove pattern with a continuous gradient of depth. In addition, the controller can also form patterns with different depths on multiple areas of the wet film layer by separately controlling the negative pressure absorption strength of the meshes in multiple areas on the wet film layer.

The coating module coats the graphene composite material on the catalyst film layer on the surface of the flexible base film to form a coating layer; a growth roll is arranged downstream of the coating module; when the flexible base film winds around the growth roll, the coating layer Under the action of the catalyst under the coating layer, the graphene composite wet film layer is catalyzed and grown.

A film thickness monitoring device is arranged between the pattern generating roller and the sizing module, and the film thickness monitoring device performs online film thickness monitoring on the wet film layer; the coating module monitors the supply of the graphene composite material according to the received film thickness monitoring signal Dynamic feedback control to adjust the film thickness of the graphene composite film online.

The coating module includes a plurality of coating units arranged in the width direction of the flexible base film; the film thickness monitoring device performs multi-point online film thickness monitoring on the wet film layer in the width direction of the flexible base film; The coating unit performs dynamic feedback control on the film thickness monitoring signal on the corresponding area, and online adjusts the film thickness of the graphene composite film on the area.

The sizing module is located downstream of the pattern generating roller; the sizing module uses light heating or oven heating to dry and shape the wet film layer, so that the wet film layer forms a graphene composite film. The heating temperature range of the shaping module is 100°C~150°C. A cooling roll is arranged downstream of the shaping module, and the cooling roll cools down the heated and shaped graphene composite film.

A temperature control roller is arranged downstream of the evaporation main roller; the temperature control range of the temperature control roller is 40 ~ 100°C; the temperature control roller adjusts the temperature of the flexible base film wrapped around the temperature control roller to within the catalytic reaction temperature range.

Lamination rollers are arranged downstream of the shaping module, and there are two lamination rollers arranged opposite to each other; protective film rolls are arranged in the chamber. The lamination roller is used to press the protective film from the protective film roll to cover the surface of the shaped graphene composite film, protect the surface of the graphene composite film on the flexible base film, and prevent the graphene composite film from being rolled and transported. Damaged during the process; protective film is preferably heat release tape. Both upstream and downstream of the lamination rollers are provided with destaticizing devices. Preferably, the lamination rollers are provided with a pressure sensor and a pressure controller for measuring the pressing pressure between the laminating rollers. Through the feedback of the pressure sensor, the pressing pressure between the laminating rollers can be monitored and adjusted in real time to ensure that the protective film It will not damage the film while pressing on the surface of the graphene composite film.

The working process of the roll-up equipment for the preparation of graphene composite film of the present invention mainly comprises:

(1) Start the evaporation module for vacuum evaporation coating, and deposit a catalyst film layer on the surface of the flexible base film that passes through the evaporation main roller; start the coating module downstream of the evaporation module, and the coating module coats the graphene composite material on the flexible base film On the catalyst film layer on the surface, a coating layer is formed; a growth roll is arranged downstream of the coating module; when the flexible base film passes through the growth roll, the coating layer is catalyzed and grown into graphite under the action of the catalyst under the coating layer vinyl composite wet film layer;

(2) The pattern forming roller arranged downstream of the growing roller partially removes the unformed wet film layer on the flexible base film wound around the roller body through a negative pressure absorption process, so that the wet film layer produces a set pattern;

(3) The wet film layer is heated, dried and shaped through the shaping module arranged downstream of the pattern generating roller, so that the wet film layer forms a graphene composite film; the shaping module is heated by light or a drying oven; the formed graphene composite film has specific patterns.

Before starting the evaporation module, the chamber should be evacuated through the vacuum system. When the vacuum degree in the chamber reaches the set value, the working gas will be filled into the non-evaporative working area through the inflation system, and the gas in the non-evaporative working area will be controlled. The pressure is in the range of 0.01MPa~0.1MPa.

A film thickness monitoring device is also installed downstream of the pattern generating roller, and the film thickness monitoring device performs online film thickness monitoring on the wet film layer; the coating module dynamically feeds back the supply of the graphene composite material according to the received film thickness monitoring signal Control, so as to adjust the film thickness of the graphene composite film online. The film thickness monitoring device performs multi-point online film thickness monitoring on the wet film layer in the width direction of the flexible base film; the coating unit will perform dynamic feedback control according to the film thickness monitoring signal on the area corresponding to the coating unit, and adjust the film thickness online. The film thickness of the graphene composite thin film on the region.

Beneficial effects of the present invention:

The winding device of the present invention provides a clean environment for the preparation of the graphene composite film by vacuumizing the sealed chamber and filling it with working gas. The catalyst layer required for the growth of the graphene composite material is first deposited on the flexible substrate by vacuum evaporation coating, so that the graphene composite material coated on it grows into a wet film layer, and then the wet film is made by the negative pressure absorption process of the pattern forming roller. The layer generates a set pattern, and the wet film layer is heated, dried and shaped by the shaping module, and finally a graphene composite flexible film with a specific pattern is obtained. The equipment can realize large-scale mass production of graphene composite flexible films represented by graphene-silicone rubber composite films. The flexible film has excellent heat resistance, high strength, excellent electromagnetic shielding properties, and its specific pattern, so that the product can meet the application of some special occasions.

Description of drawings

Fig. 1 is a schematic structural view of an embodiment of a winding device of the present invention;

Fig. 2 is a schematic structural view of an embodiment of a pattern generating roller in the present invention;

Fig. 3 is a structural schematic diagram of another embodiment of the pattern generating roller in the present invention.

Detailed ways

Embodiments of the present invention will be further described below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to illustrate and explain the present invention, not to limit the present invention.

Fig. 1 is a schematic structural view of an embodiment of the roll-up equipment of the present invention, as shown in the figure, the present invention provides a kind of roll-up equipment for the preparation of graphene composite film, mainly including chamber 1, evaporation module 2. Coating module 3, sizing module 4 and winding system; winding system includes unwinding roller 5, winding roller 6, evaporation main roller 7 and pattern generating roller 8; in chamber 1, it is divided into The evaporation work area 10 and the non-evaporative work area 11, the evaporation module 2 is arranged in the evaporation work area 10; the pattern generation roller 8 is arranged between the coating module 3 and the sizing module 4; The unformed wet film layer on the flexible base film of the pattern generating roller 8 is partially removed, thereby forming a graphene composite film with a specific pattern on the flexible base film.

The chamber 1 is provided with a vacuum system 12 and an inflation system 13; the vacuum system 12 is used to create a clean vacuum environment in the chamber 1, and the inflation system is used to fill in working gas. Before the preparation of the graphene composite film, the gas in the chamber 1 is evacuated through the vacuum system 12, so that the vacuum degree in the chamber reaches above 10Pa (that is, the pressure reaches below 10Pa), and then the non- The evaporation working area 11 is fed with the working gas required for preparing the graphene composite film, and the gas pressure in the non-evaporating working area 11 in the chamber is controlled within the range of 0.01MPa~0.1MPa. The evaporation main roller 7 is arranged across the evaporation working area and the non-evaporating working area, and the gap between the partition plate 9 and the surface of the evaporation main roller 7 is in the range of 1-5mm. The chamber 1 is also provided with pressure gauges, hygrometers and temperature gauges for measuring environmental parameters.

The evaporation main roll 7 is located downstream of the unwinding roll 5 and upstream of the coating module 3; the evaporation module 2 is located below the evaporation main roll 7, and is used for depositing a catalyst film layer on the surface of the flexible base film by vacuum evaporation coating.

The coating module 3 coats the graphene composite material on the catalyst film layer on the surface of the flexible base film to form a coating layer; the downstream of the coating module 3 is provided with a growth roll 22; when the flexible base film winds around the growth roll 22, The coating layer is catalyzed and grown into a graphene composite wet film layer under the action of the catalyst under the coating layer.

A film thickness monitoring device 23 is arranged between the pattern generating roller 8 and the sizing module 4, and the film thickness monitoring device 23 carries out online film thickness monitoring to the wet film layer; the coating module 3 composites the graphene according to the film thickness monitoring signal received The supply of materials is controlled dynamically by feedback, so as to adjust the film thickness of the graphene composite film online.

The coating module 3 includes a plurality of coating units arranged in the width direction of the flexible base film; the film thickness monitoring device 23 performs multi-point online film thickness monitoring on the wet film layer in the width direction of the flexible base film; the coating unit will Dynamic feedback control is performed according to the film thickness monitoring signal on the area corresponding to the coating unit, and the film thickness of the graphene composite film on the area is adjusted online.

The sizing module 4 is located downstream of the pattern generating roller 8; the sizing module 4 uses light heating or oven heating to dry and shape the wet film layer, so that the wet film layer forms a graphene composite film. The heating temperature range of the shaping module 4 is 100° C. to 150° C. A cooling roll 24 is arranged downstream of the shaping module 4, and the cooling roll 24 cools down the heated and shaped graphene composite film.

A temperature control roller 25 is arranged downstream of the evaporation main roller 7; the temperature control range of the temperature control roller 25 is 40 to 100°C; the temperature control roller 25 adjusts the temperature of the flexible base film around the temperature control roller to the catalytic reaction temperature range Inside.

A lamination roller 26 is arranged downstream of the shaping module 4 , and there are two lamination rollers arranged opposite to each other; a protective film rolling roller 27 is arranged in the chamber 1 . The lamination roller is used to press the protective film from the protective film roll to cover the surface of the shaped graphene composite film, protect the surface of the graphene composite film on the flexible base film, and prevent the graphene composite film from being rolled and transported. Damaged during the process; protective film is preferably heat release tape. Both upstream and downstream of the lamination rollers are provided with destaticizing devices. Preferably, a pressure sensor and a pressure controller for measuring the pressing pressure between the laminating rollers are provided on the laminating rollers. Through the feedback of the pressure sensor, the pressing pressure between the laminating rollers can be monitored and adjusted in real time to ensure that the protective film It will not damage the film while pressing on the surface of the graphene composite film.

A pattern generating roller 8 is arranged downstream of the coating module 3 . Fig. 2 is a structural schematic diagram of an embodiment of the pattern generating roller in the present invention, as shown in the figure, the pattern generating roller 8 is a double-layer mechanism, including an inner roller 14 and an outer roller 15; the roller surface of the outer roller 15 is a net Shaped structure with a mesh array arranged above; an array of absorption holes is arranged on the wall of the inner roller 14, and the absorption holes 16 in the array of absorption holes are connected to the meshes 17 in the array of meshes through an absorption pipe 18; the inner roller The inside of 14 is a cavity structure, and the end of the inner roller 14 is connected with a low vacuum pump 19, and the low vacuum pump 19 pumps the inside of the inner roller 14 into a negative pressure relative to the air pressure in the chamber.

The inner side of the roller wall of the inner roller 14 is provided with a masking tube slot; the masking tube 20 can be inserted in the masking tube slot, and the unfolded shape of the masking tube 20 corresponds to the specific pattern that the graphene composite film to be formed on the flexible base film has. ; The masking cylinder 20 shields and seals some absorption holes in the absorption hole array on the roller wall from the inside of the inner roller wall; when the pattern generation roller 8 works, the continuous and stable negative pressure of the inner roller will from those unshielded absorption holes The wet film layer covered on these mesh holes is subjected to negative pressure absorption through the absorption pipeline and mesh holes connected therewith, so as to remove this part of the wet film layer on the flexible base film wound around the pattern forming roller.

By controlling the exhaust speed of the low vacuum pump 19, the negative pressure absorption force of the pattern forming roller on the wet film layer can be adjusted, and the part of the wet film layer covered on the mesh can be completely or partially removed.

Fig. 3 is a structural schematic diagram of another embodiment of the pattern generating roller in the present invention. As shown in the figure, in this embodiment, the pattern generating roller 8 also includes a controller; an electronically controlled valve 21 is arranged on the absorption pipeline 18; after the controller receives the pattern generating instruction, it opens according to the preset pattern generating program The electric control valve on some absorption pipes, the negative pressure of the inner roller will generate negative pressure absorption from these absorption pipes through the absorption holes and meshes connected to them to the wet film layer covering these meshes, so as to This part of the wet film layer on the flexible base film of the roll body is removed. The controller can individually adjust the opening of the electronically controlled valves on some absorption pipes to individually control the negative pressure absorption of the wet film layer by the controlled meshes connected to these absorption pipes, so that The wet film layer on the surface is completely or partially removed. The controller separately controls the negative pressure absorption strength of the wet film layer by a plurality of adjacent meshes, so that the negative pressure absorption strength of these adjacent meshes forms a gradual trend, so that the covering on these adjacent meshes The wet film layer forms a groove pattern with a continuous gradient of depth. In addition, the controller can also form patterns with different depths on multiple areas of the wet film layer by separately controlling the negative pressure absorption strength of the meshes in multiple areas on the wet film layer.

The working process of the roll-up equipment for the preparation of graphene composite film of the present invention mainly comprises:

(1) Start the evaporation module for vacuum evaporation coating, and deposit a catalyst film layer on the surface of the flexible base film that passes through the evaporation main roller; start the coating module downstream of the evaporation module, and the coating module coats the graphene composite material on the flexible base film On the catalyst film layer on the surface, a coating layer is formed; a growth roll is arranged downstream of the coating module; when the flexible base film passes through the growth roll, the coating layer is catalyzed and grown into graphite under the action of the catalyst under the coating layer vinyl composite wet film layer;

(2) The pattern forming roller arranged downstream of the growing roller partially removes the unformed wet film layer on the flexible base film wound around the roller body through a negative pressure absorption process, so that the wet film layer produces a set pattern;

(3) The wet film layer is heated, dried and shaped through the shaping module arranged downstream of the pattern generating roller, so that the wet film layer forms a graphene composite film; the shaping module is heated by light or a drying oven; the formed graphene composite film has specific patterns.

Before starting the evaporation module, the chamber should be evacuated through the vacuum system. When the vacuum degree in the chamber reaches the set value, the working gas will be filled into the non-evaporative working area through the inflation system, and the gas in the non-evaporative working area will be controlled. The pressure is in the range of 0.01MPa~0.1MPa.

A film thickness monitoring device is also installed downstream of the pattern generating roller, and the film thickness monitoring device performs online film thickness monitoring on the wet film layer; the coating module dynamically feeds back the supply of the graphene composite material according to the received film thickness monitoring signal Control, so as to adjust the film thickness of the graphene composite film online. The film thickness monitoring device performs multi-point online film thickness monitoring on the wet film layer in the width direction of the flexible base film; the coating unit will perform dynamic feedback control according to the film thickness monitoring signal on the area corresponding to the coating unit, and adjust the film thickness online. The film thickness of the graphene composite thin film on the region.

Claims (7)

1. The winding type equipment for preparing the graphene composite film mainly comprises a chamber, an evaporation module, a coating module, a shaping module and a winding system; the winding system comprises an unreeling roller, a reeling roller, an evaporation main roller and a pattern generating roller; the chamber is divided into an evaporation working area and a non-evaporation working area by a partition board, and an evaporation module is arranged in the evaporation working area; the evaporation main roller is positioned at the downstream of the unreeling roller and the upstream of the coating module; the evaporation module is positioned below the evaporation main roller and is used for depositing a catalyst film layer on the surface of the flexible base film through vacuum evaporation film plating; the coating module coats the graphene composite material on the catalyst film layer on the surface of the flexible base film to form a coating layer; a growth roller is arranged at the downstream of the coating module; when the flexible base film passes through the growth roller, the coating layer is catalyzed and grown into a graphene composite wet film layer under the action of a catalyst below the coating layer; the pattern generating roller is arranged between the coating module and the shaping module; the pattern generating roller partially removes a wet film layer which is not formed on the flexible base film wound around the pattern generating roller through negative pressure absorption, so that a graphene composite film with a specific pattern is formed on the flexible base film;

the pattern generating roller is a double-layer mechanism and comprises an inner roller and an outer roller; the outer roller surface is of a net structure, and a mesh array is arranged on the outer roller surface; an absorption hole array is arranged on the roller wall of the inner roller, and absorption holes in the absorption hole array are connected with meshes in the mesh array through absorption pipelines; the inner roller is of a cavity structure, the end part of the inner roller is connected with a low vacuum pump, and the low vacuum pump pumps the inner roller into negative pressure relative to the air pressure in the cavity;

the pattern generating roller further includes a controller; an electric control valve is arranged on the absorption pipeline; after the controller receives the pattern generation instruction, an electric control valve on some absorption pipelines is opened according to a preset pattern generation program, and negative pressure of the inner roller can absorb the wet film layers covered on the meshes from the absorption pipelines through the absorption holes and the meshes connected with the absorption pipelines, so that the wet film layers on the flexible base film wound around the pattern generation roller are removed; the controller can independently adjust the opening of the electric control valve on some absorption pipelines to independently control the negative pressure absorption force of the controlled meshes connected with the absorption pipelines on the wet film layer, so that the wet film layer covered on the controlled meshes is completely or partially removed; the controller controls the negative pressure absorption forces of a plurality of adjacent meshes to the wet film layer respectively to enable the negative pressure absorption forces of the adjacent meshes to form gradual change trend, so that the wet film layer covered on the adjacent meshes forms a groove pattern with continuously gradual change depth; in addition, the controller can also form patterns with different depths on the multiple areas of the wet film layer by respectively controlling the negative pressure absorption force of meshes of the multiple areas to the wet film layer;

the vacuum system and the inflation system are arranged on the chamber, before the graphene composite film is prepared, the gas in the chamber is pumped out through the vacuum system, so that the gas pressure in the chamber is below 10Pa, then working gas required for preparing the graphene composite film is introduced into a non-evaporation working area in the chamber through the inflation system, and the gas pressure of the non-evaporation working area in the chamber is controlled within the range of 0.01MPa-0.1 MPa.

2. The winding apparatus for graphene composite film preparation according to claim 1, wherein: the inner side of the roller wall of the inner roller is provided with a covering cylinder slot; a masking cylinder can be inserted into the masking cylinder slot, and the spreading shape of the masking cylinder corresponds to a specific pattern of the graphene composite film to be formed on the flexible base film; the covering cylinder shields and seals certain absorption holes in the absorption hole array on the roller wall from the inner side of the roller wall of the inner roller; when the pattern generating roller works, negative pressure of the inner roller can generate negative pressure absorption on the wet film layers covered on the meshes from the non-shielded absorption holes through the absorption pipelines and the meshes connected with the inner roller, so that the wet film layers on the flexible base film which passes through the pattern generating roller are removed.

3. The winding apparatus for graphene composite film preparation according to claim 2, wherein: by controlling the exhaust speed of the low vacuum pump, the negative pressure absorption force of the pattern generating roller on the wet film layer can be adjusted, and the part of the wet film layer covered on the mesh holes can be completely removed or partially removed.

4. The winding apparatus for graphene composite film preparation according to claim 1, wherein: a film thickness monitoring device is arranged between the pattern generating roller and the shaping module, and the film thickness monitoring device monitors the film thickness of the wet film layer on line; and the coating module performs dynamic feedback control on the supply amount of the graphene composite material according to the received film thickness monitoring signal, so that the film thickness of the graphene composite film is adjusted on line.

5. The winding apparatus for graphene composite membrane preparation according to claim 4, wherein: the coating module includes a plurality of coating units arranged in a width direction of the flexible base film; the film thickness monitoring device monitors the film thickness of the wet film layer in a multipoint on-line manner in the width direction of the flexible base film; the coating unit can perform dynamic feedback control according to a film thickness monitoring signal on a region corresponding to the coating unit, and the film thickness of the graphene composite film on the region is regulated on line.

6. The winding apparatus for graphene composite film preparation according to claim 1, wherein: the shaping module is positioned at the downstream of the pattern generating roller; and the shaping module adopts illumination heating or drying box heating to dry and shape the wet film layer, so that the wet film layer forms a graphene composite film.

7. The winding apparatus for graphene composite film preparation according to claim 1, wherein: a temperature control roller is arranged at the downstream of the evaporation main roller; the temperature control interval of the temperature control roller is 40-100 ℃; the temperature control roller adjusts the temperature of the flexible base film wound around the temperature control roller to be within the catalytic reaction temperature range.

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