Graphene Oxide Membrane Coating System

Abstract

The present invention provides a graphene oxide film coating system, which includes a coating roller. A coating substrate is tensionally connected to the coating roller. A scraper is disposed adjacent to the coating roller. The coating roller is on the side of the coating substrate away from the coating roller, and a coating gap is formed between the scraper and the coating side of the coating substrate. The system further includes a material tank, which has a feed port and a discharge port. The discharge port is correspondingly disposed opposite to the coating side of the coating substrate. An extrusion die head is provided at the feed port, and the extrusion die head can extrude the graphene oxide slurry into the material tank. The present invention uses the extrusion of the extrusion die head to extrude and feed the graphene oxide slurry into the material tank, so that a slurry with a flat liquid surface can be obtained in the material tank. The slurry in the material tank flows through the coating gap between the scraper and the coating side of the coating substrate under the pressure of its own weight, and is flow-coated on the coating side of the coating substrate, thereby forming a graphene oxide wet film with a uniform thickness.

Description

Technical Field

[0001] The present invention belongs to the technical field of graphene film coating, and particularly relates to a graphene oxide film coating system. Background Art

[0002] In the prior art, there are generally two methods for coating a slurry on a substrate:

[0003] One is extrusion coating, in which the slurry is sprayed onto a substrate stretched vertically upward. The extrusion die lip and the coated substrate are perpendicular and very close to each other. The distance is related to the wet film thickness and coating speed during coating, about dozens to hundreds of μm. If the slurry is sprayed too thickly in this way, the slurry on the substrate will flow down, resulting in uneven film surface and inability to obtain a wet film with a large thickness. Therefore, the thickness of the film coated by this method generally does not exceed 1 mm, but a wet film thickness of 1-4 mm is required for graphene oxide slurry coating.

[0004] The other is transfer coating, in which the slurry is scraped into a film with a certain thickness on a coating roller through the gap between the coating roller and the doctor blade. The coating roller rotates continuously, and then a back roller with a coated substrate leans against the coating roller to transfer the film on the coating roller to the coated substrate. Since the coating roller and the back roller are arranged parallel to the horizontal plane, when rotating, if the wet film is too thick, the shape of the film will change, resulting in uneven coating thickness.

[0005] That is, in the prior art, the extrusion coating and transfer coating methods cannot form a graphene oxide film with a large thickness (1-4 mm) and uniform thickness. Summary of the Invention

[0006] To solve at least one of the above problems, the present invention provides a graphene oxide film coating system, including a coating roller, a coating substrate is tensionally connected to the coating roller, a doctor blade is arranged adjacent to the coating roller, the coating roller is on the side of the coating substrate away from the coating roller, and a coating gap is formed between the doctor blade and the coating side of the coating substrate. The system further includes a material tank, the material tank has a feed port and a discharge port, the discharge port is correspondingly arranged with the coating side of the coating substrate, and an extrusion die head is arranged at the feed port, and the extrusion die head can extrude the graphene oxide slurry into the material tank.

[0007] Preferably, the graphene oxide film coating system further includes a drying oven, the drying oven is downstream of the running direction of the coating substrate, a first over-roller is provided at the inlet of the drying oven, the coating substrate is tensioned between the coating roller and the first over-roller, and an angle a is formed between the outlet direction of the coating substrate and the horizontal plane, 8° ≤ a ≤ 20°.

[0008] Preferably, the line connecting the axes of the doctor blade and the coating roll intersects the roll wall of the coating roll at point B, the tangent point where the coating substrate detaches from the coating roll is point C, point B is on the side of point C closer to the material tank, and the arc length between point B and point C is 5 mm to 10 mm.

[0009] Preferably, the graphene oxide film coating system further includes a position adjustment component for adjusting the relative position of the doctor blade with respect to the coating roll, thereby adjusting the coating gap.

[0010] Preferably, the position adjustment component includes a mounting plate, a swing arm is pivotally connected to the mounting plate, the doctor blade is rotatably connected to the swing arm in a drivable manner, a motor is provided at one end of the swing arm, and a lifting cylinder is connected to the other end of the swing arm. The lifting cylinder and the motor are used to drive the position change of the doctor blade.

[0011] Preferably, a limiting member is further provided on the mounting plate, and the limiting member is on the side of the swing arm away from the coating roll.

[0012] Preferably, a film thickness detection component is provided at the coating substrate between the coating roll and the first guide roll.

[0013] Preferably, the coating roll is pivotally connected to the mounting plate; and / or, the material tank is connected to the mounting plate; and / or, the extrusion die head is connected to the mounting plate.

[0014] A graphene oxide film coating system provided by the present invention extrudes and feeds graphene oxide slurry into the material tank by means of the extrusion of the extrusion die head, and can obtain a slurry with a flat liquid surface in the material tank. The slurry in the material tank flows through the coating gap between the doctor blade and the coating side of the coating substrate under the pressure of its own weight, and is flow-coated on the coating side of the coating substrate, thereby forming a graphene oxide wet film with a uniform thickness. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a partial structural schematic diagram of the graphene oxide film coating system according to an embodiment of the present invention;

[0016] Figure 2 is Figure 1 a partial enlarged view of part A in

[0017] Figure 3 is a structural schematic diagram of the position adjustment component of the graphene oxide film coating system according to an embodiment of the present invention.

[0018] The reference numerals are shown as:

[0019] 1. Coating roller; 2. Doctor blade; 3. Material tank; 4. Extrusion die head; 100. Coating substrate; 5. Drying oven; 51. First over-roller; 61. Mounting plate; 62. Swing arm; 63. Motor; 64. Lifting cylinder; 65. Limiting member; 7. Film thickness detection component. Detailed implementation manner

[0020] Referring to Figures 1 to 3 As shown, according to an embodiment of the present invention, a graphene oxide film coating system is provided, including a coating roller 1, on which a coating substrate 100 is tensioned and connected. Adjacent to the coating roller 1, there is a doctor blade 2. The coating roller 1 is on the side of the coating substrate 100 away from the coating roller 1, and a coating gap is formed between the doctor blade 2 and the coating side of the coating substrate 100. It also includes a material tank 3, which has a feed port and a discharge port. The discharge port is correspondingly arranged with the coating side of the coating substrate 100, and an extrusion die head 4 is provided at the feed port. The extrusion die head 4 can extrude the graphene oxide slurry into the material tank 3. In this technical solution, by using the extrusion of the extrusion die head 4, the graphene oxide slurry is extruded and fed into the material tank 3, and a slurry with a flat liquid surface can be obtained in the material tank 3. The slurry in the material tank 3 flows through the coating gap between the doctor blade 2 and the coating side of the coating substrate 100 (which can also be understood as between the doctor blade 2 and the coating roller 1) under the pressure of its own weight, and is flow-coated on the coating side of the coating substrate 100, thereby forming a graphene oxide wet film with a uniform thickness. It can be understood that the extrusion die head 4 extrudes the slurry from its internal cavity to its discharge port by using a large pressure. Because the internal pressure is consistent, the slurry outflow amount at each place of its discharge port is ensured to be equal. Therefore, a flat slurry liquid surface can be formed in the material tank 3, and the flat liquid surface of the slurry can make the coating pressure brought by the self-weight of the slurry consistent, thereby ensuring the uniformity of the film layer thickness. Further, it can be understood that when the liquid level of the slurry in the material tank 3 is uneven, it will cause inconsistent pressure of the slurry in the material tank 3 transmitted to the coating place, resulting in inconsistent coating thickness and causing unevenness. Since the graphene oxide slurry has a high viscosity, the conventional feeding method cannot obtain a flat liquid surface in the material tank 3, while the extrusion die head 4 in this application can overcome this defect in the prior art.

[0021] The graphene oxide film coating system further includes a drying oven 5, which is downstream of the running direction of the coating substrate 100 and is used for drying the formed wet graphene oxide film. The inlet of the drying oven 5 has a first over-roller 51. The coating substrate 100 is tensioned between the coating roller 1 and the first over-roller 51, and the outlet direction of the coating substrate 100 forms an angle a with the horizontal plane, where 8° ≤ a ≤ 20°. Specifically, when a > 20°, due to the certain fluidity of the wet film, wet film flow will occur, resulting in uneven film layers. When a < 8°, there is no leveling process for the wet film, which will lead to fine textures on the film surface and the film layers will also be less uniform.

[0022] Preferably, the line connecting the axes of the doctor blade 2 and the coating roller 1 intersects the roller wall of the coating roller 1 at point B, and the tangent point where the coating substrate 100 separates from the coating roller 1 is point C. Point B is on the side of point C closer to the slurry tank 3, and the arc length between point B and point C is 5 mm to 10 mm. If it is less than 5 mm, other interferences such as external vibrations will affect the slurry coating and horizontal stripes will appear. If it is greater than 10 mm, the slurry in the slurry tank 3 is not easily transferred to the cutting edge of the doctor blade 2, and a wet film with a relatively thick thickness cannot be formed.

[0023] Furthermore, the graphene oxide film coating system further includes a position adjustment component for adjusting the relative position of the doctor blade 2 with respect to the coating roller 1, thereby adjusting the coating gap. That is, the relative position between the doctor blade 2 and the coating roller 1 can be changed by operating the position adjustment component, thereby adjusting the formation thickness of the wet film, and enabling the coating system to meet the manufacturing requirements of graphene oxide films with different thicknesses.

[0024] As a specific implementation manner of the position adjustment component, the position adjustment component includes a mounting plate 61. A swing arm 62 is pivotally connected to the mounting plate 61. The doctor blade 2 is rotatably connected to the swing arm 62 in a drivable manner. One end of the swing arm 62 is provided with a motor 63, and the other end of the swing arm 62 is connected to a lifting cylinder 64. The lifting cylinder 64 and the motor 63 are used to drive the position change of the doctor blade 2. More specifically, the lifting cylinder 64 is used to drive the doctor blade 2 to lift and lower, while the motor 63 is used to precisely adjust the distance between the doctor blade 2 and the coating roller 1.

[0025] Preferably, a limiting member 65 is further provided on the mounting plate 61, and the limiting member 65 is on the side of the swing arm 62 away from the coating roller 1 to limit the lifting displacement range of the swing arm 62.

[0026] In some embodiments, a film layer thickness detection component 7 is provided at the coating substrate 100 between the coating roller 1 and the first over-roller 51. The film layer thickness detection component 7 can be, for example, an X-ray testing system which can move horizontally to be able to detect the thickness of the entire coating surface and can control the operation of the motor 63 according to the detected real-time thickness, and further adjust the relative position between the doctor blade 2 and the coating roller 1 in real time to further ensure the uniformity of the coating film layer thickness.

[0027] Preferably, the coating roller 1 is pivotally connected to the mounting plate 61; and / or, the material tank 3 is connected to the mounting plate 61; and / or, the extrusion die head 4 is connected to the mounting plate 61, that is, the coating roller 1, the material tank 3, the doctor blade 2 and the extrusion die head 4 are all mounted on the mounting plate 61, so that the relative positional relationship between these components is more stable, and at the same time, the structure is simpler and more compact.

[0028] It is easily understood by those skilled in the art that, on the premise of no conflict, the above advantageous manners can be freely combined and superimposed.

[0029] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention. The above is only the preferred implementation manner of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A graphene oxide film coating system, characterized in that, it includes a coating roller (1), a coating substrate (100) is tensionally connected to the coating roller (1), a doctor blade (2) is arranged adjacent to the coating roller (1), the coating roller (1) is on the side of the coating substrate (100) away from the coating roller (1), and a coating gap is formed between the doctor blade (2) and the coating side of the coating substrate (100). It further includes a material tank (3), the material tank (3) has a feed inlet and a discharge outlet, the discharge outlet is correspondingly arranged with the coating side of the coating substrate (100), an extrusion die head (4) is arranged at the feed inlet, and the extrusion die head (4) can extrude the graphene oxide slurry into the material tank (3); The graphene oxide film coating system further includes a drying oven (5), the inlet of the drying oven (5) has a first idler roller (51), the coating substrate (100) is tensioned between the coating roller (1) and the first idler roller (51), and an included angle a is formed between the outlet direction of the coating substrate (100) and the horizontal plane, 8° ≤ a ≤ 20°; The slurry in the material tank (3) flows through the coating gap between the doctor blade and the coating side of the coating substrate (100) under the pressure of its own weight, and is flow-coated on the coating side of the coating substrate (100), thereby forming a graphene oxide wet film with uniform thickness; The connecting line between the axis of the doctor blade (2) and the axis of the coating roller (1) intersects the roller wall of the coating roller (1) at point B, the separation tangent point of the coating substrate (100) and the coating roller (1) is point C, point B is on the side of point C close to the material tank (3), and the arc length between point B and point C is 5 mm to 10 mm; The graphene oxide film coating system further includes a position adjustment component for adjusting the relative position of the doctor blade (2) relative to the coating roller (1), and further adjusting the coating gap.

2. The graphene oxide film coating system according to claim 1, characterized in that, the drying oven (5) is downstream of the running direction of the coating substrate (100).

3. The graphene oxide film coating system according to claim 1, characterized in that, the position adjustment component includes a mounting plate (61), a swing arm (62) is pivotally connected to the mounting plate (61), the doctor blade (2) is rotatably connected to the swing arm (62) in a drivable manner, one end of the swing arm (62) is provided with a motor (63), and the other end of the swing arm (62) is connected with a lifting cylinder (64), and the lifting cylinder (64) and the motor (63) are used to drive the position change of the doctor blade (2).

4. The graphene oxide film coating system according to claim 3, characterized in that, a limiting member (65) is further arranged on the mounting plate (61), and the limiting member (65) is on the side of the swing arm (62) away from the coating roller (1).

5. The graphene oxide film coating system according to claim 3, characterized in that, A film thickness detection component (7) is provided at the coating substrate (100) between the coating roller (1) and the first guide roller (51).

6. The graphene oxide film coating system according to claim 3, characterized in that the coating roller (1) is pivotally connected to the mounting plate (61); and / or, the material tank (3) is connected to the mounting plate (61); and / or, the extrusion die head (4) is connected to the mounting plate (61).

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