A device for hydrophobic treatment of carbon paper

Abstract

The utility model discloses a device for hydrophobic treatment of carbon paper, comprising: a liquid application unit, a liquid discharge unit, a drying unit and a shaping unit arranged in sequence according to the direction of the carbon paper; the liquid application unit comprises a liquid application mechanism and a vacuum adsorption component arranged in sequence according to the direction of the carbon paper; the liquid application mechanism is used to coat the carbon paper with a hydrophobic agent, and the vacuum adsorption component can discharge bubbles in the internal pores of the carbon paper through negative pressure; the liquid discharge unit is used to discharge excess hydrophobic agent in the carbon paper to adjust the content of the hydrophobic agent in the carbon paper; the drying unit is used to dry the carbon paper; and the shaping unit is used to perform hot pressing shaping on the dried carbon paper. The device for hydrophobic treatment of carbon paper provided by the utility model is provided with a vacuum adsorption component behind the liquid application mechanism, which can discharge bubbles in the internal pores of the carbon paper through negative pressure, so that the hydrophobic agent enters the porous structure of the carbon paper, so that the hydrophobic agent can fully impregnate the carbon paper, and improve the hydrophobic uniformity in the cross-sectional direction of the carbon paper.

Description

Technical Field

[0001] The utility model relates to the technical field of hydrophobic treatment of fuel cell carbon paper, and more specifically to a device for hydrophobic treatment of carbon paper. Background Art

[0002] Hydrogen fuel cells are energy conversion devices that convert chemical energy directly into electrical energy. They have the advantages of high energy density, high utilization rate, cleanliness and quietness. They are highly efficient energy conversion devices. Among them, proton exchange membrane fuel cells are the most widely used. Their core components are membrane electrodes, which are the multiphase material transmission and electrochemical reaction sites for energy conversion. They involve three-phase interface reactions and complex mass transfer and heat transfer processes, which directly determine the performance, life and cost of fuel cells. The membrane electrode is composed of proton exchange membranes, catalysts, gas diffusion layers, bipolar plates and other structures.

[0003] The gas diffusion layer is placed between the bipolar plate and the catalyst layer on both sides of the membrane electrode anode and cathode. It plays a multi-faceted role in battery operation by controlling the reaction gas, product water, heat, and electron transfer. The gas diffusion layer is usually designed as a porous material. Carbon paper is used as the base layer of the gas diffusion layer, in which the void area mainly controls the transfer of gas and water, while the solid structure provides a path for the conduction of heat and electricity.

[0004] In order to ensure that the product water generated by the reaction can be discharged from the pores of the carbon paper in time, the carbon paper must be treated with hydrophobicity.

[0005] Hydrophobic agents generally use fluorocarbon polymers, which are dispersed in water to form a stable dispersion emulsion after technical surface modification. After forming a film on the surface of the material, a water-resistant structure can be formed by changing the solid-liquid contact angle, making the surface hydrophobic, water-repellent, waterproof and draining. Hydrophobic agents for carbon paper include: polytetrafluoroethylene (PTFE), polyperfluoroethylene propylene (FEP), ethylene tetrafluoroethylene copolymer (ETFE), soluble polytetrafluoroethylene (PFA), polyvinylidene fluoride homopolymer (PVDF), etc. Carbon paper is impregnated with an emulsion containing a hydrophobic agent, and then dried to evenly distribute the hydrophobic agent particles on the surface of the carbon paper. After sintering to reach the melting point of the hydrophobic agent, the hydrophobic agent can be melted and flattened into a film to form a good hydrophobic structure.

[0006] Carbon paper is a porous, non-dense material, with a network of numerous overlapping fibers inside, forming a rich pore structure. Therefore, during the hydrophobic treatment of carbon paper at this stage, due to the surface tension of the liquid, it is difficult for the gas in the small pores of the carbon paper to be discharged, so it is difficult to be completely infiltrated by the hydrophobic agent emulsion.

[0007] Therefore, how to provide a device for hydrophobic treatment of carbon paper that can fully impregnate the carbon paper with a hydrophobic agent has become a technical problem that urgently needs to be solved in the art. Utility Model Content

[0008] The utility model aims to provide a device for hydrophobic treatment of carbon paper which can make a hydrophobic agent fully impregnate the carbon paper.

[0009] The utility model provides a device for hydrophobic treatment of carbon paper, comprising:

[0010] A liquid application unit, a liquid discharge unit, a drying unit and a shaping unit are arranged in sequence according to the direction of the carbon paper;

[0011] The liquid application unit includes a liquid application mechanism and a vacuum adsorption component which are arranged in sequence along the direction of the carbon paper; the liquid application mechanism is used to coat the carbon paper with a hydrophobic agent, and the vacuum adsorption component can discharge bubbles in the internal pores of the carbon paper through negative pressure;

[0012] The liquid discharge unit is used to discharge the excess hydrophobic agent in the carbon paper to adjust the content of the hydrophobic agent in the carbon paper;

[0013] The drying unit is used for drying the carbon paper;

[0014] The shaping unit is used to heat-press and shape the dried carbon paper.

[0015] Optionally, the vacuum adsorption assembly includes a vacuum adsorption plate and a negative pressure device, the vacuum adsorption plate is provided with a dehydration gap, and the dehydration gap extends along the width direction of the carbon paper;

[0016] The negative pressure device is connected to the dehydration gap to form a negative pressure at the dehydration gap.

[0017] Optionally, a plurality of dehydration slits are provided, and the plurality of dehydration slits are parallel to each other and perpendicular to the straight line where the carbon paper runs;

[0018] The widths of the multiple dehydration slits decrease in sequence along the direction where the carbon paper runs.

[0019] Optionally, the liquid applying mechanism comprises a slit liquid applying die head, and the width of the slit liquid applying die head is greater than or equal to the width of the carbon paper.

[0020] Optionally, the liquid discharge unit comprises a first squeezing roller and a second squeezing roller that are arranged opposite to each other, and the carbon paper passes between the first squeezing roller and the second squeezing roller.

[0021] Optionally, the liquid discharge unit further comprises a lifting mechanism, and the lifting mechanism drives the first squeezing roller to move toward or away from the second squeezing roller.

[0022] Optionally, the drying unit includes a drying furnace and a fan, and the fan is used to draw air from the drying furnace to form a negative pressure in the drying furnace.

[0023] Optionally, the drying unit further comprises a soft seal, and the inlet and the outlet of the drying furnace are each provided with a soft seal to reduce air flow leakage in the cavity of the drying furnace.

[0024] Optionally, the bottom end of the drying furnace is provided with an air inlet grid, and the opening of the air inlet grid is adjustable to stabilize the pressure in the cavity of the drying furnace.

[0025] Optionally, the shaping unit includes a sintering furnace, a first shaping roller and a second shaping roller; the first shaping roller and the second shaping roller are arranged in a furnace cavity of the sintering furnace.

[0026] According to the technical content disclosed in the utility model, the following beneficial effects are achieved:

[0027] The utility model provides a device for hydrophobic treatment of carbon paper, in which a liquid applying unit comprises a liquid applying mechanism and a vacuum adsorption component which are arranged in sequence along the direction of the carbon paper; the liquid applying mechanism is used to coat the carbon paper with a hydrophobic agent, the carbon paper is a porous and non-dense material, the interior of which is composed of a network of numerous overlapping fibers to form a rich pore structure, due to the surface tension of the liquid, it is difficult for the gas in the small pores of the carbon paper to be discharged, resulting in the hydrophobic agent being unable to enter the porous structure of the carbon paper, and a vacuum adsorption component is arranged behind the liquid applying mechanism to discharge the bubbles in the internal pores of the carbon paper through negative pressure, so that the hydrophobic agent enters the porous structure of the carbon paper, so that the hydrophobic agent can fully impregnate the carbon paper, thereby improving the hydrophobic uniformity in the cross-sectional direction of the carbon paper.

[0028] Other features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the present invention and, together with the description, serve to explain the principles of the present invention.

[0030] Figure 1 It is a schematic diagram of a device for hydrophobic treatment of carbon paper of the utility model.

[0031] Description of reference numerals:

[0032] a. Unwinding roller;

[0033] b1, carbon paper before hydrophobic treatment; b2, carbon paper after hydrophobic treatment;

[0034] c. Winding roller;

[0035] d1, traction guide roller one; d2, traction guide roller two; d3, traction guide roller three; d4, traction guide roller four; d5, traction guide roller five;

[0036] 11. Liquid storage tank; 12. Metering pump; 13. Liquid infusion pipeline; 14. Slit liquid dispensing die head; 15. Vacuum adsorption plate; 16. Vacuum deliquation pipeline; 17. Vacuum pump;

[0037] 211, first squeezing roller; 212, second squeezing roller; 22, lifting mechanism;

[0038] 31. Drying furnace; 32. Fan; 33. Soft seal;

[0039] 41. Sintering furnace; 421. First shaping roller; 422. Second shaping roller; 43. Pressure regulating mechanism. DETAILED DESCRIPTION

[0040] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention.

[0041] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present invention, its application, or uses.

[0042] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0043] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0044] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0045] At present, the following problems exist in the hydrophobic treatment process of carbon paper: carbon paper is a porous and non-dense material, and its interior is composed of a network of numerous overlapping fibers, forming a rich pore structure. On the one hand, due to the surface tension of the liquid, it is difficult for the gas in the small pores of the carbon paper to be discharged, so it is difficult to be completely infiltrated by the hydrophobic agent emulsion; on the other hand, due to the influence of gravity, the hydrophobic agent is easy to deposit on the lower surface of the carbon paper during the drying process. These influences invisibly cause the hydrophobic agent to form a certain degree of heterogeneity in the cross-sectional direction of the carbon paper, that is, the hydrophobic agent content on both sides of the carbon paper is high, while the hydrophobic agent content inside the carbon paper is relatively low. Once this degree of heterogeneity is too large, during the use of the membrane electrode, the reaction product water may not be discharged in time, occupying too many pore channels, resulting in poor transmission of the reaction gas (hydrogen, oxygen), and the battery power generation performance will be significantly affected.

[0046] Therefore, the utility model mainly adopts the impregnation method of slit coating liquid application and vacuum adsorption liquid removal, and uses negative pressure to discharge the bubbles in the micropores inside the carbon paper, so that the hydrophobic agent can fully impregnate the carbon paper and improve the hydrophobic uniformity of the carbon paper cross-sectional direction; further adopts slit rolling to squeeze out excess hydrophobic agent on the surface of the carbon paper to ensure that the hydrophobic amount of the carbon paper is controllable; further adopts negative pressure drying method to improve the hydrophobic uniformity of the carbon paper; further adopts hot rolling method to shape the molten hydrophobic agent to improve the surface flatness of the carbon paper.

[0047] See also Figure 1 The utility model discloses a device for hydrophobic treatment of carbon paper, comprising: an unwinding roller a and a winding roller c, the two ends of the length of the carbon paper are respectively connected to the unwinding roller a and the winding roller c, that is, the carbon paper b1 is wound on the unwinding roller a before the hydrophobic treatment, and the carbon paper b2 is wound on the winding roller c after the hydrophobic treatment. The unwinding roller a has a tension control function, and the winding roller c can control the tension of the carbon paper according to the winding line speed.

[0048] Between the unwinding roller a and the winding roller c, a liquid application unit, a liquid discharge unit, a drying unit and a shaping unit are arranged in sequence according to the direction of the carbon paper. The liquid application unit includes a liquid application mechanism and a vacuum adsorption component arranged in sequence according to the direction of the carbon paper; the liquid application mechanism is used to coat the carbon paper with a hydrophobic agent, and the vacuum adsorption component can discharge bubbles in the internal pores of the carbon paper through negative pressure; the liquid discharge unit is used to discharge excess hydrophobic agent in the carbon paper to adjust the hydrophobic agent content in the carbon paper; the drying unit is used to dry the carbon paper; and the shaping unit is used to perform hot pressing shaping on the dried carbon paper.

[0049] The vacuum adsorption assembly includes a vacuum adsorption plate 15 and a negative pressure device, and the negative pressure device includes a vacuum pump 17 and a vacuum dehydration pipeline 16; a dehydration gap is provided on the vacuum adsorption plate 15, and the dehydration gap extends along the width direction of the carbon paper; one end of the vacuum dehydration pipeline 16 is connected to the dehydration gap, and the other end of the vacuum dehydration pipeline 16 is connected to the vacuum pump 17, and its vacuum degree control range is 0.02-0.08MPa, and a water vapor separator should be provided at the lower end of the drainage. Starting the vacuum pump 17 can form a negative pressure at the dehydration gap to discharge bubbles in the internal pores of the carbon paper from the dehydration gap, so that the hydrophobic agent enters the porous structure of the carbon paper.

[0050] The liquid dispensing mechanism includes a slit liquid dispensing die head 14, and the width of the slit liquid dispensing die head 14 is greater than or equal to the width of the carbon paper. The width of the slit liquid dispensing die head 14 should not be less than the width of the carbon paper sheet, and the slit width is 50 to 300 μm; the height between the slit liquid dispensing die head 14 and the vacuum adsorption plate 15 should not be less than the thickness of the carbon paper to ensure that a stable and continuous liquid film can be formed between the die head and the carbon paper.

[0051] Three dehydration slits are provided, and the width of the dehydration slits is consistent with the width of the slit liquid application die 14. The three dehydration slits are parallel to each other and perpendicular to the straight line where the carbon paper runs. The slit widths of the three dehydration slits decrease in the direction where the carbon paper runs, which are 0.5mm, 0.2mm, and 0.1mm respectively.

[0052] Furthermore, the liquid application unit also includes a liquid storage tank 11 connected to the dehydration gap pipeline on the vacuum adsorption plate 15, and the liquid storage tank 11 is used to collect and store the hydrophobic agent, and can supply the hydrophobic agent to the slit liquid application die 14 through a metering pump 12 and a liquid infusion pipeline 13.

[0053] The prepared hydrophobic agent emulsion is placed in the liquid storage tank 11. The hydrophobic agent can be one of polytetrafluoroethylene (PTFE), polyperfluoroethylene propylene (FEP), ethylene tetrafluoroethylene copolymer (ETFE), soluble polytetrafluoroethylene (PFA), polyvinylidene fluoride homopolymer (PVDF), and its solid content is 1-8%. The hydrophobic agent should be evenly dispersed without agglomeration, insoluble matter, or precipitation. The metering pump 12 can be a peristaltic pump, a diaphragm pump, or a gear pump, and the flow control should be stable; the flow control size matches the slit width, the carbon paper sheet width, and the traction roller axis speed, that is, the peristaltic pump flow ≥ slit width × carbon paper sheet width × traction roller axis speed.

[0054] The liquid discharge unit includes a first squeezing roller 211, a second squeezing roller 212 and a lifting mechanism 22 which are arranged opposite to each other. The carbon paper passes between the first squeezing roller 211 and the second squeezing roller 212. The lifting mechanism 22 is connected to the first squeezing roller 211. The lifting mechanism 22 can drive the first squeezing roller 211 to move toward or away from the second squeezing roller 212 to adjust the size of the gap between the first squeezing roller 211 and the second squeezing roller 212. The first squeezing roller 211 and the second squeezing roller 212 are made of soft rubber with a hardness of no more than 50. The lifting mechanism 22 can be used to adjust the gap between the first squeezing roller 211 and the second squeezing roller 212 to control the size of the gap to be no less than the thickness of the carbon paper.

[0055] The drying unit includes a drying furnace 31 and a fan 32. The fan 32 is used to extract air from the drying furnace 31 to form a negative pressure in the drying furnace 31. The inlet and outlet of the drying furnace 31 are each provided with a soft seal 33 to reduce the leakage of airflow in the cavity of the drying furnace 31. The bottom end of the drying furnace 31 is equipped with an air intake grid, and the opening of the air intake grid is adjustable to stabilize the pressure in the cavity. The drying temperature of the drying furnace 31 is not less than 100°C. Turning on the fan 32 can exhaust air from the drying furnace 31, and a negative pressure can be formed in the cavity; the bottom end of the drying furnace 31 is equipped with an air intake grid, and the opening can be controlled to stabilize the pressure in the furnace cavity; in addition, the inlet and outlet at both ends of the drying furnace 31 are equipped with soft seals 33 to reduce airflow leakage.

[0056] The shaping unit includes a sintering furnace 41, a first shaping roller 421 and a second shaping roller 422; the first shaping roller 421 and the second shaping roller 422 are arranged in the furnace chamber of the sintering furnace 41. The first shaping roller 421 is connected to a pressure regulating mechanism 43, and the pressure regulating mechanism 43 can drive the first shaping roller 421 to move toward or away from the second shaping roller 422 to adjust the gap between the first shaping roller 421 and the second shaping roller 422.

[0057] The concept of the utility model is that: within the width range of carbon paper, the narrow slit liquid application can form a stable liquid film, and the surface of the carbon paper can be completely immersed in the hydrophobic agent; the vacuum adsorption plate 15 has three vacuum dehydration slits. When the carbon paper passes through the vacuum adsorption plate 15, the tiny bubbles in the internal pores will be discharged due to the negative pressure, and the hydrophobic agent will occupy its pore position, so that all the spaces inside and outside the carbon paper can be fully impregnated with the hydrophobic agent. The first squeezing roller 211 and the second squeezing roller 212 are equipped with a lifting device to control the gap between the squeezing rollers. After the carbon paper is impregnated with the hydrophobic agent, the excess hydrophobic agent can be squeezed out after passing through the gap between the first squeezing roller 211 and the second squeezing roller 212, so as to effectively control the hydrophobic agent content of the carbon paper. The drying furnace 31 is equipped with an exhaust fan 32, and the furnace inlet and outlet are equipped with a soft rubber pad sealing structure. When the carbon paper passes through the drying furnace 31, the internal cavity can form a negative pressure, which can effectively reduce the deposition of hydrophobic agent on the carbon paper surface caused by gravity and improve the hydrophobic uniformity of the carbon paper. The sintering furnace 41 is equipped with shaping rollers, and the carbon paper forms hot pressing shaping on the molten hydrophobic agent through the gap, which can effectively improve the surface flatness of the carbon paper. Preferably, the temperature of the sintering furnace 41 should be higher than the melting point of the corresponding hydrophobic agent and lower than the thermal decomposition temperature of the corresponding hydrophobic agent; the spring in the pressure regulating mechanism 43 can form a stable pressure on the first shaping roller 421; the pressure between the roller surfaces of the first shaping roller 421 and the second shaping roller 422 should be lower than the compression failure stress of the carbon paper.

[0058] There are also 5 pulling guide rollers between the unwinding roller a and the winding roller c, namely: the linear speed control of the pulling guide roller 1 d1, the pulling guide roller 2 d2, the pulling guide roller 3 d3, the pulling guide roller 4 d4, and the pulling guide roller 5 d5 should be consistent to ensure that the process of each device section can be accurately controlled and implemented; before the hydrophobic treatment, the carbon paper b1 can generate stable tension and can be unwound continuously, and after the hydrophobic treatment, the carbon paper b2 can generate stable tension and can be wound continuously.

[0059] The workflow of the utility model mainly includes:

[0060] 1. First, place the carbon paper to be treated with hydrophobicity on the unwinding roller a, control the tension and unwind steadily. Turn on all the pulling rollers, namely, pulling roller 1 d1, pulling roller 2 d2, pulling roller 3 d3, pulling roller 4 d4, pulling roller 5 d5, and control the speed to be consistent, and introduce the carbon paper b1 before the hydrophobic treatment into the pulling roller 1 d1.

[0061] 2. Place the prepared hydrophobic agent emulsion into the liquid storage tank 11, turn on the metering pump 12 and control the flow rate to be stable, adjust the slit width in the slit liquid dispensing die 14, and pass the carbon paper through the gap between the slit liquid dispensing die 14 and the vacuum adsorption plate 15 so that the hydrophobic agent can form a stable and continuous liquid film on the surface of the carbon paper.

[0062] 3. Turn on the vacuum pump 17 and control the vacuum degree of the vacuum dehydration pipeline 16, and pass the carbon paper through the vacuum adsorption plate at a uniform speed so that the excess hydrophobic agent can flow back to the liquid storage tank 11.

[0063] 4. Turn on the first squeezing roller 211 and the second squeezing roller 212, and use the lifting mechanism 22 to adjust the gap between the two rollers, so that the carbon paper can pass through the gap steadily, squeeze out the excess hydrophobic agent, and make it flow back to the liquid storage tank 11, and introduce the carbon paper into the traction guide roller 2 d2.

[0064] 5. Turn on the drying furnace 31 and heat it to the set temperature. Pass the carbon paper through the drying furnace 31 so that the carbon paper fits the inlet and outlet soft seals 33. Turn on the fan 32 for exhaust. Adjust the air inlet grid to form a negative pressure inside the drying furnace 31. After the carbon paper is completely dried and passes through the drying furnace 31, introduce the carbon paper into the traction guide roller three d3.

[0065] 6. Turn on the sintering furnace 41 and heat it to the set temperature. Use the pressure regulating mechanism 43 to enable the first shaping roller 421 and the second shaping roller 422 to form a stable pressure. Pass the carbon paper through the traction guide roller 4d4, the sintering furnace 41 and between the first shaping roller 421 and the second shaping roller 422 in sequence. After the carbon paper completes the roller shaping and passes through the sintering furnace 41, introduce the carbon paper into the traction guide roller 5d5.

[0066] 7. Pull the hydrophobic treated carbon paper b2 to the winding roller c, control the tension and perform stable winding.

[0067] In some embodiments, during the hydrophobic agent application and dipping process, another scheme is as follows:

[0068] 1. Completely immerse the carbon paper in the hydrophobic agent emulsion, and add an ultrasonic cleaning device in the immersion tank to use ultrasonic vibration to expel the bubbles in the internal pores of the carbon paper, so as to achieve the hydrophobic agent impregnation of the carbon paper.

[0069] 2. Instead of the slit liquid dispensing die head, a spray device is used to spray the hydrophobic agent onto the surface of the carbon paper, and the carbon paper is completely immersed in the hydrophobic agent by utilizing the liquid diffusion effect.

[0070] In summary, the utility model provides a device for hydrophobic treatment of carbon paper. The carbon paper is treated by a liquid impregnation device. Since the slit provides a stable hydrophobic agent liquid film and the vacuum dehydration can discharge the tiny bubbles inside the carbon paper, the carbon paper can be fully impregnated with hydrophobic agent from the surface to all positions inside. The carbon paper is treated by a negative pressure drying device. Since the internal cavity forms a negative pressure, the deposition caused by the gravity of the liquid hydrophobic agent is effectively reduced. After the hydrophobic treatment is carried out by this device, the uniformity of the hydrophobic agent in the carbon paper is good, which can effectively reduce the problem that the content of hydrophobic agent on the surface of the carbon paper is higher than the content of hydrophobic agent in the inner layer of the carbon paper. The carbon paper is treated by an extrusion and liquid discharge device, and the gap between the pressure rollers squeezes out excess hydrophobic agent, which effectively controls the content of hydrophobic agent in the carbon paper and ensures that the hydrophobic amount of the carbon paper is stable. Carbon paper is a porous material with poor surface flatness. The carbon paper is treated by a sintering and shaping device. The hydrophobic agent particles on the surface of the carbon paper are heated to a molten state, and then rolled and shaped and cooled and solidified, which can effectively improve the surface flatness of the carbon paper.

[0071] Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present invention. It should be understood by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A device for hydrophobic treatment of carbon paper, characterized in that: include: A liquid application unit, a liquid discharge unit, a drying unit and a shaping unit are arranged in sequence according to the direction of the carbon paper; The liquid application unit comprises a liquid application mechanism and a vacuum adsorption component which are arranged in sequence along the direction of the carbon paper; the liquid application mechanism is used to apply a hydrophobic agent to the carbon paper, and the vacuum adsorption component can discharge bubbles in the internal pores of the carbon paper through negative pressure; The liquid discharge unit is used to discharge excess hydrophobic agent in the carbon paper to adjust the content of the hydrophobic agent in the carbon paper; The drying unit is used to dry the carbon paper; The shaping unit is used for hot pressing and shaping the dried carbon paper.

2. The device for hydrophobic treatment of carbon paper according to claim 1, characterized in that: The vacuum adsorption assembly comprises a vacuum adsorption plate and a negative pressure device, the vacuum adsorption plate is provided with a dehydration slit, and the dehydration slit extends along the width direction of the carbon paper; The negative pressure device is connected to the dehydration gap to form a negative pressure at the dehydration gap.

3. The device for hydrophobic treatment of carbon paper according to claim 2, characterized in that: The dehydration slits are provided in plurality, and the plurality of dehydration slits are parallel to each other and perpendicular to the straight line where the carbon paper runs; The widths of the plurality of dehydration slits decrease in sequence along the direction in which the carbon paper runs.

4. The device for hydrophobic treatment of carbon paper according to any one of claims 1 to 3, characterized in that: The liquid applying mechanism comprises a slit liquid applying die head, and the width of the slit liquid applying die head is greater than or equal to the width of the carbon paper.

5. The device for hydrophobic treatment of carbon paper according to any one of claims 1 to 3, characterized in that: The liquid discharge unit includes a first squeezing roller and a second squeezing roller that are oppositely disposed, and the carbon paper passes between the first squeezing roller and the second squeezing roller.

6. The device for hydrophobic treatment of carbon paper according to claim 5, characterized in that: The liquid discharge unit further includes a lifting mechanism, and the lifting mechanism drives the first squeezing roller to move toward or away from the second squeezing roller.

7. The device for hydrophobic treatment of carbon paper according to any one of claims 1 to 3, characterized in that: The drying unit comprises a drying furnace and a fan, wherein the fan is used to extract air from the drying furnace to form a negative pressure in the drying furnace.

8. The device for hydrophobic treatment of carbon paper according to claim 7, characterized in that: The drying unit further comprises a soft seal, and the inlet and the outlet of the drying furnace are each provided with one of the soft seals to reduce airflow leakage in the cavity of the drying furnace.

9. The device for hydrophobic treatment of carbon paper according to claim 7, characterized in that: The bottom end of the drying furnace is provided with an air inlet grid plate, and the opening of the air inlet grid plate is adjustable to stabilize the pressure in the cavity of the drying furnace.

10. The device for hydrophobic treatment of carbon paper according to any one of claims 1 to 3, characterized in that: The shaping unit comprises a sintering furnace, a first shaping roller and a second shaping roller; the first shaping roller and the second shaping roller are arranged in a furnace cavity of the sintering furnace.

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