CN115425242B - Carbon paper homogenizing hydrophobic treatment device and carbon paper hydrophobic curing process - Google Patents

Carbon paper homogenizing hydrophobic treatment device and carbon paper hydrophobic curing process Download PDF

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Publication number
CN115425242B
CN115425242B CN202211366272.4A CN202211366272A CN115425242B CN 115425242 B CN115425242 B CN 115425242B CN 202211366272 A CN202211366272 A CN 202211366272A CN 115425242 B CN115425242 B CN 115425242B
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carbon paper
heating
air
drying
conveying roller
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CN115425242A (en
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刘静
徐斌
张军
陈杰
赖志勇
凌昊
何钰
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Jiangsu Yuanhydrogen New Energy Technology Co ltd
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Jiangsu Yuanhydrogen New Energy Technology Co ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/86—Inert electrodes with catalytic activity, e.g. for fuel cells
    • H01M4/88—Processes of manufacture
    • H01M4/8803—Supports for the deposition of the catalytic active composition
    • H01M4/8807—Gas diffusion layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H16/00—Unwinding, paying-out webs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H18/00—Winding webs
    • B65H18/08—Web-winding mechanisms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H20/00—Advancing webs
    • B65H20/02—Advancing webs by friction roller
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H23/00—Registering, tensioning, smoothing or guiding webs
    • B65H23/04—Registering, tensioning, smoothing or guiding webs longitudinally
    • B65H23/18—Registering, tensioning, smoothing or guiding webs longitudinally by controlling or regulating the web-advancing mechanism, e.g. mechanism acting on the running web
    • B65H23/182—Registering, tensioning, smoothing or guiding webs longitudinally by controlling or regulating the web-advancing mechanism, e.g. mechanism acting on the running web in unwinding mechanisms or in connection with unwinding operations
    • B65H23/1825—Registering, tensioning, smoothing or guiding webs longitudinally by controlling or regulating the web-advancing mechanism, e.g. mechanism acting on the running web in unwinding mechanisms or in connection with unwinding operations and controlling web tension
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/22—Addition to the formed paper
    • D21H23/32—Addition to the formed paper by contacting paper with an excess of material, e.g. from a reservoir or in a manner necessitating removal of applied excess material from the paper
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H25/00—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
    • D21H25/04—Physical treatment, e.g. heating, irradiating
    • D21H25/06—Physical treatment, e.g. heating, irradiating of impregnated or coated paper
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30—Hydrogen technology
    • Y02E60/50—Fuel cells

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Paper (AREA)

Abstract

The invention discloses a carbon paper homogenizing hydrophobic treatment device and a carbon paper hydrophobic curing process. The curing assembly comprises an infiltration tank containing PTFE emulsion and a conveying roller set, carbon paper moves through the infiltration tank along the conveying roller set, the carbon paper moves along the horizontal direction after entering the infiltration tank and is immersed in the PTFE emulsion, then the carbon paper upwards leaves the infiltration tank along the vertical direction, an air shower nozzle is arranged above the infiltration tank, an inclination angle is formed between the air outlet direction of the air shower nozzle and the front and back surfaces of the carbon paper, and the carbon paper moves through the heating and drying assembly along the horizontal direction. According to the carbon paper homogenizing hydrophobic treatment device and the carbon paper hydrophobic curing process, redundant PTFE emulsion on the surface of the carbon paper is removed in the air-showering curing stage, the PTFE emulsions on the surfaces of the two sides of the carbon paper are uniformly distributed, excessive PTFE emulsion residue on the surface of the carbon paper is avoided, and continuous production can be realized.

Description

Carbon paper homogenizing hydrophobic treatment device and carbon paper hydrophobic curing process
Technical Field
The invention relates to the field of carbon paper hydrophobic solidification, in particular to a carbon paper homogenization hydrophobic treatment device and a carbon paper hydrophobic solidification process.
Background
With the increasing demand of energy and the rapid consumption of fossil fuels, the frequent occurrence of environmental pollution compels people to find a green novel energy. Fuel Cells (FCs), which are green electrochemical devices for directly and efficiently converting chemical energy of Fuel into electrical energy, are important energy sources for countries around the world to cope with energy shortage and environmental pollution. Among them, proton Exchange Membrane Fuel Cells (PEMFCs) have unique functions such as high energy density, environmental friendliness, and rapid response to load variation, have developed in a cross-over manner, and have entered the initial stage of commercialization. Nevertheless, two key challenges that fuel cells need to face are cost reduction and durability improvement. A Membrane Electrode Assembly (MEA), which is a core component of the PEMFC, is composed of a Proton Exchange Membrane (PEM), a Catalyst Layer (CL), and a Gas Diffusion Layer (GDL). The main function of the PEM is to transport protons from the anode to the cathode and to prevent electrons, fuel and products from reaching the cathode. CL is a site where electrochemical reactions occur. The basic functions of the GDL are mainly the following: (1) providing support for the catalytic layer; (2) The reaction gas is conveyed to the catalyst layer from the flow field, and liquid water is discharged from CL to the flow field, so that the cathode is prevented from flooding; (3) Capable of rapidly conducting electrons, balancing heat inside the PEMFC, and maintaining the membrane in a wet state at low humidity.
The performance of the MEA is reflected in its polarization curve and it can be seen that the voltage drops with increasing current in the current read from the cell. There are three main sources of voltage loss: kinetic losses of the electrochemical reaction at low current, ohmic internal resistance losses due to material and interface resistance, and mass transport losses at high current density when it is difficult for the catalyst to obtain sufficient reactants. For the main sources of the voltage loss, the following methods can be adopted to reduce the voltage loss so as to improve the performance of the PEMFC in a multi-azimuth cooperative manner: the reactivity of the catalyst is improved, the resistance of the current PEM and gas diffusion media is reduced, and the mass transfer resistance is reduced. The three ways of reducing the voltage loss are comparedIt is relatively difficult to substantially reduce the resistance of PEMFCs using currently available materials. According to the technical target requirements of catalysts in the United states DOE 2025, the total loading of platinum group metals is less than or equal to 0.1g/kW under rated power, and the performance of MEA reaches 1.8W/cm 2 . In order to satisfy high energy conversion efficiency and cost reduction, the mass activity of the catalyst needs to be increased by 4 times as much as that of the currently used Pt/C catalyst, which is difficult to achieve, however. The performance of the GDL is one of the key factors affecting the output power and durability of the PEMFC. PEMFCs require water to wet the PEM sufficiently at startup to protonate the PEM sufficiently to maintain adequate proton conductivity. When the PEM is operated at a high current density, water vapor in the cell condenses into liquid water, and when the liquid water accumulates at the CL/GDL interface, the gas pressure exceeds the threshold pressure to force the water from the flow channel back to the GDL and CL, so that the electrodes are flooded. This phenomenon covers the active sites of the reactants, preventing electrochemical reactions from occurring, thereby reducing power density. At the same time, this situation can cause cell reversal phenomena, leading to degradation of the catalytic layer and corrosion of the carbon support. Therefore, the performance of the GDL is crucial to PEMFC water management capabilities, especially in high current areas of full power operation, continuous load operation, and overload operation.
In order to improve the water management capability of the gas diffusion layer, it is necessary to subject the carbon paper, which is a base material of the gas diffusion layer, to a hydrophobic treatment. The production process is that carbon paper is dipped in Polytetrafluoroethylene (PTFE) emulsion, dried, solidified and sintered to form a substrate layer, and then mixed slurry of carbon powder and PTFE is sprayed on the surface of the microporous layer and dried and sintered. Due to the brittleness of the carbon paper, the carbon paper is easily broken by clamping and soaking, and the content of polytetrafluoroethylene in the carbon paper after hydrophobic treatment is not uniform.
Chinese patent ZL200620137261.9 discloses an equipment for gas diffusion layer material carries out hydrophobic treatment, this patent equipment can carry out the roller to the material and inhale the processing to the two sides of turning over before drying after steeping gas diffusion layer substrate material (carbon paper), utilize the linkage of a plurality of rollers with unnecessary hydrophobing agent suction on the carbon paper, it is inhomogeneous to have guaranteed that the hydrophobing agent does not gather in a large number on carbon paper surface and avoid containing the hydrophobing agent in the carbon paper, be favorable to forming even hydrophobic pore. However, the apparatus has some disadvantages such as the inability to perform soaking, continuous processing, and the fact that back roll suction does not play a substantial role. Chinese patent CN207021339U discloses a carbon paper dewatering treatment device which comprises a telescopic mechanism, a soaking device, a roller suction device and the like. The carbon paper is placed on a tool plate, the lifting mechanism drives the support to descend and soak in the soaking device, and after the lifting mechanism ascends to the same height of the roller suction device, the telescopic mechanism pushes the tool to enable the squeezing roller and the liquid suction sheet in the carbon paper roller suction device to suck away the hydrophobic agent on the surface of the carbon paper. The equipment can realize two processes of dipping and roll suction of the carbon paper from the horizontal direction, and realize automatic continuous treatment, so that the process is simplified, and the time is saved. Since the whole hydrophobic treatment direction of the device is horizontal, even if the liquid absorbing sheet absorbs a large amount of redundant hydrophobic agent, the hydrophobic agent is attached to the side facing the adsorption roller by gravity to a large extent, so that the hydrophobic agent in the vertical direction of the carbon paper is not uniformly distributed. In addition, the device has direct influence on the performance and quality of the gas diffusion layer when the drying unit of the carbon paper is horizontally arranged on the air supply pipe above the conveyor belt and the air supply spray head arranged on the air supply pipe in parallel. In the aspect of production efficiency, the device is more suitable for hydrophobic treatment of the sheet-shaped carbon paper, and the production efficiency cannot meet the yield of the conventional membrane electrode. Chinese patent CN110993996A discloses a hydrophobic treatment system for carbon paper, wherein the hydrophobic solution is sprayed on the carbon paper by a spraying unit, and then the hydrophobic solution on the upper surface of the carbon paper is primarily removed by an air spraying unit above the carbon paper through an air spraying mode. The whole hydrophobic treatment direction of the equipment is still the horizontal direction, the air spraying mode can only clear redundant hydrophobic solution on the upper surface of the carbon paper, and the hydrophobic solution on the back surface of the carbon paper cannot be effectively adsorbed.
The existing carbon paper hydrophobic treatment equipment cannot effectively absorb or remove or adsorb redundant hydrophobic solution on the back of the carbon paper after the carbon paper is soaked or sprayed, so that the uniformity of the hydrophobic solution on the front side and the back side of the carbon paper is different. The back surface of the carbon paper after the subsequent curing treatment has a large amount of hydrophobic solution accumulated relative to the front surface, so that the performance difference of the front surface and the back surface of the carbon paper is caused.
Disclosure of Invention
The invention mainly solves the technical problem of providing a carbon paper homogenizing hydrophobic treatment device and a carbon paper hydrophobic curing process, which remove redundant PTFE emulsion on the surface of carbon paper in the air showering curing stage, ensure that the PTFE emulsion on the surfaces of two sides of the carbon paper is uniformly distributed, ensure that no excessive PTFE emulsion residue exists on the surface of the carbon paper, and realize continuous production.
In order to solve the technical problems, the invention adopts a technical scheme that: the utility model provides a carbon paper homogenization hydrophobic treatment device, including the subassembly of unreeling, solidification subassembly, heating and drying subassembly and the rolling subassembly that set gradually, by carbon paper that unreels the subassembly loops through solidification subassembly and heating and drying subassembly after by the rolling subassembly rolling, the solidification subassembly is including containing the infiltration tank and the conveying roller set of PTFE emulsion, carbon paper removes through the infiltration tank along conveying roller set, and carbon paper removes and submergence in the PTFE emulsion along the horizontal direction after getting into the infiltration tank, then upwards leaves the infiltration tank along vertical direction, the infiltration tank top is equipped with the wind and drenches the shower nozzle, form the angle of inclination between the air-out direction of wind drenches the shower nozzle and the positive and negative of the carbon paper of rebound, carbon paper removes through the heating and drying subassembly along the horizontal direction.
In a preferred embodiment of the invention, the conveying roller group comprises a left conveying roller and a right conveying roller which are positioned at the left side and the right side above the infiltration tank, and a plurality of middle conveying rollers which are positioned at the inner side of the infiltration tank and are arranged along the horizontal direction, wherein the carbon paper vertically enters the infiltration tank downwards through the left conveying roller, horizontally moves through the middle conveying rollers to be fully infiltrated, and then vertically upwards leaves the infiltration tank through the right conveying roller.
In a preferred embodiment of the present invention, a heating air duct is disposed above the infiltration tank, and the carbon paper leaves the infiltration tank, is sprayed with air, removes the excess PTFE emulsion, is dried and cured by hot air in the heating air duct, and then enters the heating and drying assembly.
In a preferred embodiment of the invention, a transition roller group is arranged above the right conveying roller, and the carbon paper is driven by the transition roller group after passing through the right conveying roller and is conveyed to the heating and drying assembly along the horizontal direction.
In a preferred embodiment of the invention, a partition layer for partitioning the air drying and curing unit and the infiltration tank is arranged above the infiltration tank at intervals, an inlet and an outlet are arranged at two ends of the partition layer, the air shower nozzles are arranged below the partition layer and positioned at two sides of the outlet, the carbon paper is conveyed out from the outlet after moving along the conveying roller group from the inlet, and the moving direction of the carbon paper is changed into the horizontal direction through the transition roller group and is cured through the heating air duct.
In a preferred embodiment of the present invention, the heating and drying assembly includes a heating plate, a plurality of drying air channels are disposed above the heating plate at intervals, and the carbon paper cures the PTFE emulsion on both sides of the carbon paper through the heating plate and the drying air channels.
In a preferred embodiment of the present invention, the height of the heating plate gradually increases and then gradually decreases along the horizontal direction.
In a preferred embodiment of the present invention, the unwinding assembly includes a carbon paper unwinding group, the carbon paper unwinding group unwinds the carbon paper through a magnetic powder tension controller, and the carbon paper passes through an unwinding power roller and then is sent to the conveying roller group.
In a preferred embodiment of the present invention, the winding assembly includes a carbon paper winding set, and the carbon paper is wound by the carbon paper winding set after passing through the laser thickness measuring unit and the winding power roller.
In order to solve the technical problem, the invention adopts another technical scheme that: the hydrophobic curing process of the carbon paper homogenizing hydrophobic treatment device comprises the following steps: a. placing the coiled material carbon paper on a carbon paper unreeling group, and controlling the tension in the transmission of a carbon paper coiled material unreeling power roller through a magnetic powder tension controller, wherein when the tension is 2 to 5N, the carbon paper is unreeled at the unreeling speed of 0.5 to 5 m/min; b. the carbon paper downwards enters the infiltration tank along the vertical direction through the conveying roller group, then passes through the infiltration tank along the horizontal direction under the guidance of the conveying roller group, is fully infiltrated by the PTFE emulsion in the infiltration tank, and finally upwards moves away from the infiltration tank along the vertical direction through the conveying roller group; c. controlling the air speed and the air quantity by the air shower nozzle during the upward movement of the carbon paper so as to remove redundant PTFE emulsion on the surface of the carbon paper and enable the emulsion on the surface of the carbon paper to be uniformly distributed, then enabling the carbon paper to pass through a heating air duct, wherein the heating temperature is 45 ℃, enabling the surface of the carbon paper to be free from excessive PTFE emulsion residue and basically dry, adjusting the carbon paper to be in the horizontal direction by a transition roller, and then sending the carbon paper into a heating and drying assembly; d. the carbon paper passes through a heating and drying assembly, the bottom of the carbon paper is dried by a heating flat plate, a drying air channel is used for drying the surface of the carbon paper, and the temperature of a drying unit is 120 ℃, 240 ℃ and 340 ℃ in sequence, so that the moisture of PTFE emulsion in the carbon paper is completely evaporated, the surfactant is removed, and the PTFE emulsion is uniformly distributed after being sintered; e. the carbon paper after high-temperature treatment is subjected to thickness measurement by an online laser thickness detection device, and the deviation rectification detection probe synchronously controls the winding power roller to move so as to ensure that the winding is smooth by detecting the moving distance of the carbon paper edge in the winding process.
The beneficial effects of the invention are: according to the carbon paper homogenization hydrophobic treatment device and the carbon paper hydrophobic solidification process, carbon paper is moved from vertical to horizontal and then to the moving direction of vertical movement, after being soaked with PTFE emulsion, the vertically moving carbon paper is dried by the solidification air shower nozzle, so that redundant PTFE emulsion on the surface of the carbon paper is removed, and the PTFE emulsions on the two sides of the carbon paper are uniformly distributed.
According to the carbon paper homogenizing hydrophobic treatment device and the carbon paper hydrophobic curing process, the infiltrated carbon paper is changed from the vertical direction to the horizontal direction to move, the carbon paper is heated through the heating air duct, so that the surface of the carbon paper is not excessively remained with PTFE emulsion and is basically dry, and then the carbon paper horizontally moves to enter the heating and drying assembly.
According to the carbon paper homogenizing and hydrophobic treatment device and the carbon paper hydrophobic curing process, the two sides of the carbon paper are uniformly heated and dried by the aid of the hot air of the upper air and the heating plates below in the heating and drying assembly, so that the water of PTFE emulsion in the carbon paper is completely evaporated, the surfactant is removed, and the PTFE emulsion is uniformly distributed after being sintered.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without inventive efforts, wherein:
FIG. 1 is a schematic structural diagram of a preferred embodiment of the carbon paper homogenizing hydrophobic treatment apparatus of the present invention;
fig. 2 is a schematic structural view of an unwinding assembly;
FIG. 3 is a schematic structural view of a curing assembly;
FIG. 4 is a top view of the curing assembly;
FIG. 5 is a schematic view of the heating and drying assembly;
FIG. 6 is a top view of FIG. 4;
FIG. 7 is a schematic view of the take-up assembly;
FIG. 8 is a top view of FIG. 1;
FIG. 9 is a schematic view of return air and intake air in the drying duct
FIG. 10 is a schematic view of the exhaust air in the drying duct;
FIG. 11 is a scanning electron microscope image of a carbon paper treated by the carbon paper homogenizing hydrophobic treatment device of the present application;
FIG. 12 is a scanning electron microscope image of a carbon paper treated by a conventional carbon paper hydrophobic treatment device;
figure 13 is a polarization curve and power density curve for a hydrogen-air fuel cell prepared from carbon paper processed in accordance with the present application and prior art apparatus;
the components in the drawings are numbered as follows: 1. unreeling component, 11, carbon paper unreeling group, 12, magnetic powder tension controller, 13, unreeling power roller, 2, curing component, 21, infiltration groove, 22, conveying roller group, 221, left conveying roller, 222, right conveying roller, 223, middle conveying roller, 24, heating air duct, 241, blast pipe, 242, hot air exhaust pipe, 25, partition layer, 26, transition roller group, 27, air shower nozzle, 3, heating drying component, 31, drying air duct, 311, air inlet pipe, 312, exhaust pipe, 313, air return pipe, 32, heating flat plate, 4, reeling component, 41, laser thickness measuring unit, 42, carbon paper reeling group, 43, reeling power roller.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below. The structure, proportion, size and the like shown in the drawings are only used for matching with the content disclosed in the specification, so that the person skilled in the art can understand and read the description, and the description is not used for limiting the limit condition of the implementation of the invention, so the method has no technical essence, and any structural modification, proportion relation change or size adjustment still falls within the scope of the technical content disclosed by the invention without affecting the effect and the achievable purpose of the invention. In addition, the terms "upper", "lower", "left", "right" and "middle" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the relative positions may be changed or adjusted without substantial technical changes.
Referring to fig. 1 to 8, a carbon paper homogenizing and dewatering device includes an unwinding assembly 1, a curing assembly 2, a heating and drying assembly 3, and a winding assembly 4, which are sequentially disposed. The carbon paper unreeled by the unreeling component is sequentially wound by the winding component 4 after passing through the curing component 2 and the heating and drying component 3.
Unreel subassembly 1 and include that carbon paper unreels group 11, carbon paper unreels group 11 and unreels carbon paper through magnetic tension controller 12, and carbon paper sends to conveying roller set 22 behind unreeling power roller 13. The magnetic powder tension controller 12 and the tension rollers are used for controlling tension in the carbon paper coiled material unreeling power roller 13, and the tension rollers are arranged at different positions so that the coiled material forms a certain wrap angle on the tension rollers to transmit torque and control unreeling tension. The magnetic powder tension controller 12 is formed by combining an input shaft and an output shaft, and granular magnetic powder is filled in a space between the input shaft and the output shaft, and the magnetic powder tension controller is an existing conventional component and is not described herein again. The carbon paper unwinding group 11 adopts a conventional unwinding roller mechanism, and realizes unwinding of carbon paper by matching with the existing magnetic powder tension controller 12 and a tension roller.
The curing assembly 2 includes an infiltration tank 21 containing a PTFE emulsion and a set of transfer rollers 22. The carbon paper moves through the infiltration tank 21 along the conveying roller group 22, moves along the horizontal direction after entering the infiltration tank 21 and is immersed in the PTFE emulsion, and then upwards leaves the infiltration tank 21 along the vertical direction, an air shower nozzle 27 is arranged above the infiltration tank 21, and the air outlet direction of the air shower nozzle 27 is opposite to the front side and the back side of the upwards moving carbon paper.
The conveying roller group 22 includes a left conveying roller 221 and a right conveying roller 222 which are located on the left side and the right side above the infiltration tank 21, and a plurality of middle conveying rollers 223 which are located inside the infiltration tank 21 and are arranged along the horizontal direction, and the carbon paper passes through the left conveying roller 221, vertically and downwards enters the infiltration tank 21, horizontally moves through the middle conveying rollers 223 to be fully infiltrated, and then passes through the right conveying roller 222 to upwards leave the infiltration tank 21 along the vertical direction. After the carbon paper is unreeled by the carbon paper unreeling group 11, the carbon paper is immersed into the infiltration tank 21 along a vertical downward direction by the left conveying roller 221, after the carbon paper enters the infiltration tank 21, the carbon paper moves in the infiltration tank 21 along a horizontal direction under the action of the right conveying roller 222, and after the carbon paper moves for a certain distance, the carbon paper leaves the infiltration tank 21 along a vertical direction through the right conveying roller 222. Because the carbon paper is horizontally transported in the infiltration tank 21, the carbon paper can be completely infiltrated in the PTFE emulsion. After the carbon paper is soaked with the PTFE emulsion, the PTFE emulsion is unevenly distributed in the vertical direction of the carbon paper due to the gravity of the PTFE emulsion, so that the moving direction of the carbon paper away from the soaking groove 21 is changed into the vertical direction, the PTFE emulsion attached to the carbon paper vertically flows downwards along the front and back surfaces of the carbon paper due to the gravity, the air shower nozzle 27 is matched, the air blowing from the air shower nozzle 27 is downward (as shown by an arrow a in figure 3), an inclined angle of 45 degrees is formed between the air shower nozzle 27 and the front and back surfaces of the carbon paper, the inclined angle of 45 degrees is the optimal air direction, the effect of removing the redundant PTFE emulsion at the angle is optimal, the air speed and the air volume are controlled, the optimal air speed is 1.5 to 3.5m/s, and the air volume is 43.2 m/s 3 /h~100.8m 3 H is used as the reference value. Air blowing is carried out to remove redundant PTFE emulsion on the surface of the carbon paper and to make the PTFE emulsion on both sides of the carbon paper uniformly distributed.
A heating air duct 24 is arranged above the soaking tank 21, and the carbon paper leaves the soaking tank 21, is dried and cured by hot air in the heating air duct 24, and then enters the heating and drying assembly 3. The upper part of the infiltration groove 21 is provided with a partition layer 25 separating the heating air duct 24 from the infiltration groove 21 at intervals, two ends of the partition layer 25 are provided with an inlet and an outlet, the air shower nozzles 27 are arranged below the partition layer 25 and are positioned at two sides of the outlet, the carbon paper is conveyed out from the outlet after moving along the conveying roller group 22 from the inlet, the moving direction of the carbon paper is changed into the horizontal direction through the transition roller group 26 and is solidified through the heating air duct 24. The partition layer 25 partitions the heating air duct 24 and the infiltration tank 21, and the hot air in the heating air duct 24 does not affect the infiltration tank 21. When the carbon paper enters the heating air duct 24 through the outlet on the partition layer 25, the air supply pipe 241 with the heating function and the air supply nozzles arranged in parallel in the paint spraying direction spray hot air, the air supply pipe 241 supplies the hot air and discharges the hot air through the nozzles, and the hot air exhaust pipe 242 discharges the hot air. Carbon paper is heated firstly, then sends into heating drying assembly 3 through transition roller set 26, and blast pipe 241 and hot-blast exhaust pipe 242 are located partition layer 25 top, and the lower extreme of blast pipe 241 and hot-blast exhaust pipe 242 sets up the fan, and the shower nozzle is located heating air duct 24 below, and blast pipe 241 and hot-blast exhaust pipe 242 all draw forth from the top of heating air duct 24 top, transversely tile the back and then vertically insert corresponding fan position downwards. The air supply pipe 241 and the hot air exhaust pipe 242 are arranged longitudinally as shown in fig. 6, and realize hot air supply by using the heat principle of the existing fan and motor and exhaust by using the air draft principle of the fan.
The transition roller group 26 is arranged above the right conveying roller 222, after the carbon paper leaves the infiltration tank 21, the carbon paper is driven by the transition roller group 26 after passing through the right conveying roller 222 and is conveyed into the heating and drying assembly 3 along the horizontal direction, and the transition roller group 26 is horizontally distributed along the heating and drying assembly 3 and is used for conveying the carbon paper. The heating and drying assembly 3 comprises a heating flat plate 32, a plurality of drying air channels 31 are arranged above the heating flat plate 32 at intervals, and the carbon paper enables the PTFE emulsion on the double sides of the carbon paper to be solidified through the heating flat plate 32 and the drying air channels 31. The height of the heating flat plate 32 is gradually increased and then gradually decreased in the horizontal direction. The carbon paper is uniformly dried by an oven with a hot air mode at the upper part and a heating plate mode at the lower part, and finally enters the carbon paper winding group 42 for winding. The drying air duct 31 is provided in 3, and each drying air duct 31 includes an air inlet duct 311, a return air duct 313, and an exhaust air duct 312. The external fresh air is heated and then sent into the drying air duct 31 through the air inlet pipe 311, and the hot air is sent out through the spray head. In fig. 6, arrow a indicates the flow of hot exhaust air, arrow B indicates the flow of hot intake air, arrow C indicates the flow of hot return air, and arrow D indicates the flow of fresh outside air. Referring to fig. 6, 9 and 10, a fan is disposed at the bottom of the air inlet pipe 311, an electric heating rod is disposed in the middle of the air inlet pipe 311, and the fan sends fresh air (arrow D) into the drying air duct 31 along the air inlet pipe 311 (arrow B). The bottom of the exhaust pipe 312 is connected to a blower fan for exhausting the heated air in the drying air duct 31. After the hot air in the drying air duct 31 is exhausted through the air return duct 313, the lower part of the air return duct 313 is communicated with the fan at the lower end of the air inlet pipe 311, and the air in the air return duct 313 is sent back to the air inlet pipe 311 through the fan again. The air inlet pipe 311, the air exhaust pipe 312 and the air return pipe 313 are all located above the drying air duct 31, the spray head is located below the drying air duct 31 and is opposite to the heating flat plate 32, and the air inlet pipe 311, the air exhaust pipe 312 and the air return pipe 313 are uniformly arranged at intervals in the longitudinal direction. The air inlet pipe 311, the exhaust pipe 312 and the air return pipe 313 are led out from the upper part of the drying air duct, transversely paved and then vertically connected downwards to the corresponding fan. The air supply and circulation of hot air are realized by utilizing the known principle of a fan and electric heating (an electric heating wire or an electric heating coil), and the hot air drying principle is common knowledge.
The winding component 4 comprises a carbon paper winding group 42, and the carbon paper is wound by the carbon paper winding group 42 after passing through a laser thickness measuring unit 41 and a winding power roller 43. The thickness of the carbon paper after high-temperature treatment is measured by online laser thickness measuring equipment, the lasers of two laser displacement sensors in a laser thickness measuring mechanism are subjected to correlation, the carbon paper after hydrophobic treatment is placed in a correlation area, and the thickness of the carbon paper after hydrophobic treatment is calculated according to the distance between the upper surface and the lower surface of the carbon paper. The deviation-rectifying detection probe synchronously controls the rolling power roller 43 to move by detecting the moving distance of the carbon paper edge in the rolling process so as to ensure that the rolling is smooth. The carbon paper winding group 42 adopts a conventional winding roller mechanism, and the laser thickness measuring unit 41, the winding power roller 43 and the carbon paper winding group 42 all adopt the existing equipment.
A carbon paper hydrophobic curing process of a carbon paper homogenizing hydrophobic treatment device comprises the following steps:
a. before carbon paper is unreeled, measuring the thickness of the carbon paper by using a micrometer or a thickness gauge, recording the thickness as l1, placing the coiled carbon paper on a carbon paper unreeling group 11, controlling the tension in the transmission of a carbon paper coiled material unreeling power roller 13 through a magnetic powder tension controller 12, and unreeling the carbon paper at the unreeling speed of 0.5-5m/min when the tension is 2-5N;
b. the carbon paper enters the infiltration tank 21 downwards along the vertical direction through the conveying roller group 22, then passes through the infiltration tank 21 along the horizontal direction under the guidance of the conveying roller group 22, is fully infiltrated by the PTFE emulsion in the infiltration tank 21, and finally moves upwards along the vertical direction through the conveying roller group 22 to leave the infiltration tank 21;
c. controlling the air speed and the air quantity by the air shower nozzle 27 during the upward movement of the carbon paper so as to remove redundant PTFE emulsion on the surface of the carbon paper and enable the emulsion on the surface of the carbon paper to be uniformly distributed, then enabling the carbon paper to pass through the heating air duct 24, wherein the heating temperature is 45 ℃, enabling the surface of the carbon paper to be free from excessive PTFE emulsion residue and basically dry, adjusting the carbon paper to be in the horizontal direction by the transition roller group 26, and then sending the carbon paper into the heating and drying assembly 3;
d. the carbon paper is driven by the transition roller group 26 to move horizontally, so that the carbon paper passes through the heating and drying assembly 3, the bottom of the carbon paper is dried by the heating flat plate 32, and the surface of the carbon paper is dried by the drying air duct 31 at the temperatures of 120 ℃, 240 ℃ and 340 ℃ in sequence, so that the water of the PTFE emulsion in the carbon paper is completely evaporated, the surfactant is removed, and the PTFE emulsion is uniformly distributed after being sintered;
e. the thickness of the carbon paper after high-temperature treatment is measured by online laser thickness measuring equipment, the lasers of two laser displacement sensors in a laser thickness measuring mechanism are subjected to correlation, the carbon paper after hydrophobic treatment is placed in a correlation area, the thickness of the carbon paper after hydrophobic treatment is calculated according to the distance between the upper surface and the lower surface of the carbon paper, and the thickness l2 is recorded. The deviation-rectifying detection probe synchronously controls the rolling power roller 43 to move by detecting the moving distance in the carbon paper rolling process so as to ensure that the rolling is smooth.
As shown in fig. 11, PTFE is distributed more uniformly in the carbon paper treated with the hydrophobic treatment of the present invention. There was a large amount of PTFE accumulation on the surface of the carbon paper of the comparative example in fig. 12 (the carbon paper of the comparative example was prepared based on the technique disclosed in CN 110993996A). The method can effectively remove redundant PTFE emulsion, and the PTFE emulsion is uniformly distributed on the front surface and the back surface of the carbon paper, and the uniformity degree is approximate to the uniformity degree, so that the uniformity degree of the front surface and the back surface of the carbon paper is almost not different in microscopic electron microscope observation. Whereas the back side of the carbon paper in the comparative case was in a state of non-uniform PTFE accumulation.
As can be seen from fig. 13, the performance of the hydrogen-air fuel cell prepared from the carbon paper after hydrophobic treatment according to the present invention is significantly higher than that of the comparative case, and especially, under high current density, the comparative case already has a significant concentration polarization phenomenon. This is because the PTFE emulsion in the carbon paper after the hydrophobic treatment in the comparative example was not uniformly distributed, resulting in flooding. The carbon paper after hydrophobic treatment can effectively improve the water management capacity of the fuel cell due to uniform distribution of the PTFE emulsion.
Different from the prior art, the carbon paper homogenizing hydrophobic treatment device and the carbon paper hydrophobic curing process remove redundant PTFE emulsion on the surface of the carbon paper in the air-showering curing stage, enable the PTFE emulsion on the surfaces of the two sides of the carbon paper to be uniformly distributed, ensure that no excessive PTFE emulsion residue exists on the surface of the carbon paper, and can realize continuous production.
The present invention and its embodiments have been described above schematically, without limitation, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if the person skilled in the art receives the teaching, without departing from the spirit of the invention, the person skilled in the art shall not inventively design the similar structural modes and embodiments to the technical solution, but shall fall within the scope of the invention.

Claims (9)

1. The utility model provides a carbon paper homogenization hydrophobic treatment device, including unreeling subassembly, solidification subassembly, heating and drying subassembly and the rolling subassembly that sets gradually, by carbon paper that unreels the subassembly and unreel loops through solidification subassembly and heating and drying subassembly after by the rolling subassembly rolling, its characterized in that, the solidification subassembly is including holding infiltration groove and the conveying roller set of PTFE emulsion, carbon paper removes through the infiltration groove along conveying roller set, and carbon paper removes and submergence in the PTFE emulsion along the horizontal direction after getting into the infiltration groove, then upwards leaves the infiltration groove along vertical direction, the infiltration groove top is equipped with the wind and drenches the shower nozzle, form the angle of inclination between the air-out direction of wind drenches the shower nozzle and the positive and negative of the carbon paper that upwards moves, carbon paper removes the heating and drying subassembly along the horizontal direction, the top of infiltration groove is equipped with hot-air duct, carbon paper leaves the infiltration groove and gets into the heating and drying subassembly after the hot-air drying solidification through heating duct after getting rid of unnecessary PTFE emulsion after the wind drenches.
2. The carbon paper homogenizing hydrophobic processing device as claimed in claim 1, wherein the conveying roller group comprises a left conveying roller and a right conveying roller which are positioned at the left side and the right side above the infiltration tank, and a plurality of middle conveying rollers which are positioned at the inner side of the infiltration tank and are arranged along the horizontal direction, the carbon paper vertically downwards enters the infiltration tank through the left conveying roller, and after horizontally moving through the middle conveying rollers to be fully infiltrated, the carbon paper upwards leaves the infiltration tank through the right conveying roller along the vertical direction.
3. The carbon paper homogenizing and hydrophobic processing device as claimed in claim 2, wherein a transition roller group is arranged above the right conveying roller, and the carbon paper is driven by the transition roller group after passing through the right conveying roller and is horizontally conveyed to the heating and drying assembly.
4. The carbon paper homogenizing and hydrophobic processing device according to claim 3, wherein a partition layer for partitioning the air drying and curing unit and the infiltration tank is arranged above the infiltration tank at intervals, an inlet and an outlet are arranged at two ends of the partition layer, the air shower nozzle is installed below the partition layer and located on two sides of the outlet, the carbon paper is sent out from the outlet after moving along the conveying roller group from the inlet, and the moving direction of the carbon paper is changed into the horizontal direction through the transition roller group and is cured through the heating air duct.
5. The carbon paper homogenizing hydrophobic treatment device according to any one of claims 1 to 4, wherein the heating and drying assembly comprises a heating flat plate, a plurality of drying air channels are arranged above the heating flat plate at intervals, and the carbon paper enables PTFE emulsion on both sides of the carbon paper to be solidified through the heating flat plate and the drying air channels.
6. The carbon paper homogenizing hydrophobic treatment device of claim 5, wherein the height of the heating flat plate is gradually increased and then gradually decreased along the horizontal direction.
7. The carbon paper homogenizing hydrophobic treatment device according to claim 1, wherein the unreeling assembly comprises a carbon paper unreeling group, the carbon paper unreeling group unreels the carbon paper through a magnetic powder tension controller, and the carbon paper passes through an unreeling power roller and then is conveyed to the conveying roller group.
8. The carbon paper homogenizing hydrophobic treatment device according to claim 1, wherein the winding assembly comprises a carbon paper winding set, and the carbon paper is wound by the carbon paper winding set after passing through the laser thickness measuring unit and the winding power roller.
9. A carbon paper hydrophobic curing process of the carbon paper homogenizing hydrophobic treatment device of claim 1, characterized by comprising the following steps:
a. placing the coiled material carbon paper on a carbon paper unreeling group, and controlling the tension in the transmission of a carbon paper coiled material unreeling power roller through a magnetic powder tension controller, wherein when the tension is 2 to 5N, the carbon paper is unreeled at the unreeling speed of 0.5 to 5 m/min;
b. the carbon paper downwards enters the infiltration tank along the vertical direction through the conveying roller group, then passes through the infiltration tank along the horizontal direction under the guidance of the conveying roller group, is fully infiltrated by the PTFE emulsion in the infiltration tank, and finally upwards moves away from the infiltration tank along the vertical direction through the conveying roller group;
c. controlling the air speed and the air quantity by the air shower nozzle during the upward movement of the carbon paper so as to remove redundant PTFE emulsion on the surface of the carbon paper and enable the emulsion on the surface of the carbon paper to be uniformly distributed, then enabling the carbon paper to pass through a heating air duct, enabling the heating temperature to be 45 ℃ so that excessive PTFE emulsion residue does not exist on the surface of the carbon paper, enabling the surface of the carbon paper to be basically dry, adjusting the carbon paper to be in the horizontal direction by a transition roller, and then sending the carbon paper into a heating and drying assembly;
d. the carbon paper passes through a heating and drying assembly, the bottom of the carbon paper is dried by a heating flat plate, a drying air channel is used for drying the surface of the carbon paper, and the temperature of a drying unit is 120 ℃, 240 ℃ and 340 ℃ in sequence, so that the moisture of PTFE emulsion in the carbon paper is completely evaporated, the surfactant is removed, and the PTFE emulsion is uniformly distributed after being sintered;
e. the carbon paper after high-temperature treatment is subjected to thickness measurement by an online laser thickness detection device, and the deviation rectification detection probe synchronously controls the rolling power roller to move to ensure that rolling is smooth by detecting the moving distance of the carbon paper edge in the rolling process.
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