JP6950562B2 - Manufacturing method of membrane electrode assembly - Google Patents

Description

The present invention relates to a method for producing a membrane electrode assembly.

The electrolyte membrane constituting the membrane electrode assembly needs to have suitable ionic conductivity and to secure the strength for maintaining the shape of the membrane. Therefore, it has been proposed to fill the pores of the porous thin film with an ion exchange resin to prepare an electrolyte membrane (for example, Patent Document 1). The pores are filled with the ion exchange resin by a method such as impregnation, coating, or spraying, and after drying for removing the solvent, an electrolyte membrane is obtained. The obtained electrolyte membrane is usually wound into a roll and transported to, for example, a fuel cell cell production line.

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In producing a membrane electrode assembly using the electrolyte membrane obtained by the above method, a catalyst electrode layer and a gas diffusion layer are laminated on the membrane surface of the electrolyte membrane while transporting the electrolyte membrane. In such a manufacturing process, it has been reported that the electrolyte membrane is occasionally broken or wrinkled. Since the breakage and wrinkles of the electrolyte membrane can cause a decrease in the power generation performance of the fuel cell, it is desirable to suppress the breakage and wrinkles of the electrolyte membrane. As a result of scrutinizing the manufacturing process of the electrolyte membrane, it is assumed that creases and wrinkles can be induced as described below.

In the porous thin film, the distribution of pores is not uniform, the distribution and size of pores are uneven, and the porosity is locally different. Therefore, uneven distribution of the ion exchange resin may occur in the electrolyte membrane in which the pores are filled with the ion exchange resin. Further, when the pores are filled with the ion exchange resin, a thin film layer of the ion exchange resin is left on the front and back surfaces of the porous thin film. Then, in the film thickness direction of the electrolyte membrane, the thermal expansion coefficient differs between the porous thin film portion filled with the ion exchange resin and the thin film layer portion containing only the ion exchange resin on the front and back surfaces thereof. In addition to this, in drying for solvent removal, the thermal history may differ in the film thickness direction and the longitudinal direction of the electrolyte membrane. As a result, it is assumed that distortion occurs in drying for removing the solvent, and if the electrolyte membrane is transported with the strain remaining, meandering of the electrolyte membrane occurs in the transport process, and breakage and wrinkles may be induced. For these reasons, a new manufacturing method capable of suppressing breakage and wrinkles of the electrolyte membrane has been required.

The present invention has been made in view of the above-mentioned problems, and can be realized as the following forms.

(1) One form of a method for producing a membrane electrode bonded body is to dry the porous thin film having an ion exchange resin in the pores of the porous thin film and having a thin film layer of the ion exchange resin on the front and back surfaces of the thin film. After preparing the electrolyte film, the step of cooling the electrolyte film to room temperature and the tension of 30 to 100 N / m on the cooled electrolyte film in 10 to 120 seconds under a temperature environment of 70 to 150 ° C. The step of applying the catalyst electrode layer is provided on the surface of the electrolyte film to which the tension is applied.

In the method for producing a membrane electrode assembly of this form, even if the electrolyte membrane produced by filling the pores of the porous thin film with an ion exchange resin is distorted, the electrolyte membrane is stretched by heating accompanied by tension application. Can be raised to reduce distortion. Therefore, according to the method for producing the membrane electrode assembly of this form, it is possible to suppress meandering in the transport process of the electrolyte membrane in which the pores of the porous thin film are filled with the ion exchange resin, and it is also possible to suppress breakage and wrinkles. In addition to this, the catalyst electrode layer can be suitably formed on the surface of the electrolyte membrane in which breakage and wrinkles are suppressed. Then, even if the electrolyte membrane in which the pores have been filled with the ion exchange resin and cooled is heated at a temperature lower than 70 ° C., the bending is insufficient and the strain cannot be suppressed. Further, when heated at a temperature exceeding 150 ° C., the electrolyte membrane is excessively bent and the strain is increased. In addition to this, it is assumed that if the tension applied to the electrolyte membrane is less than 30 N / m, the suppression of strain does not proceed, and if it is more than 100 N / m, the electrolyte membrane is stretched. In addition, if the tension applied to the electrolyte membrane is shorter than 10 seconds, the strain is not suppressed, and if the tension is longer than 120 seconds, the strain is increased.

The present invention can be realized in various aspects. For example, it can be realized in the form of a method for manufacturing an electrolyte membrane or a method for manufacturing a fuel cell.

It is explanatory drawing which shows the manufacturing procedure of the membrane electrode assembly. It is explanatory drawing which shows the schematic structure of the filling apparatus of an ion exchange resin in a porous thin film. It is explanatory drawing which shows the schematic structure of the heat treatment apparatus which aims at heating of a porous thin film sheet with tension application. It is explanatory drawing which shows the schematic structure of the electrode layer forming apparatus which forms a catalyst electrode layer using a catalyst ink. It is explanatory drawing which shows the schematic structure of the electrode layer forming apparatus which transfers a catalyst electrode sheet, and forms a catalyst electrode layer. It is explanatory drawing which shows the state of the strain measurement of the electrolyte membrane sheet obtained by filling the pores of a porous thin film sheet with an ion exchange resin schematically. It is 1st explanatory drawing which shows the relationship between the processing condition and strain in the heat treatment apparatus which aims at the heat treatment to the electrolyte membrane sheet. It is a 2nd explanatory drawing which shows the relationship between the processing condition and strain in the heat treatment apparatus which heat-treats the electrolyte membrane sheet.

FIG. 1 is an explanatory diagram showing a manufacturing procedure of a membrane electrode assembly. This membrane electrode assembly manufacturing procedure is an embodiment of the present invention, and includes a step S10 for forming an electrolyte membrane and a step S20 for forming a catalyst electrode layer. In preparing the electrolyte membrane in step S10, first, in step S12, the porous thin film using the dissolved solution of the ion exchange resin is filled with the ion exchange resin. As a result, the pores of the porous thin film are filled with the ion exchange resin, and a thin film layer of the ion exchange resin is formed on the front and back surfaces of the thin film of the porous thin film. After that, drying is performed to evaporate and remove the solvent of the dissolution solution, and cooling to room temperature is performed.

In the preparation of the electrolyte membrane, an ion exchange resin having a perfluorosulfonic acid group, an imidazole group, a phosphoric acid group or the like exhibiting proton conductivity is used in step S12. Further, as the porous thin film, a thin film sheet having a thickness of about 8 μm formed porously using an appropriate polymer resin such as polyolefin is used. Hereinafter, the porous thin film is referred to as a porous thin film sheet TS.

FIG. 2 is an explanatory diagram showing a schematic configuration of an ion exchange resin filling device 100 for a porous thin film. The filling device 100 is a device for carrying out the step S12 of FIG. The filling device 100 includes a coating unit 110 and a drying unit 120. The coating unit 110 is a general die coater, and includes a backup roll 112 and a die head 114 arranged to face the backup roll 112. The backup roll 112 is continuously conveyed from the strip-shaped backsheet BS in which the backsheet BS is continuously conveyed from the unwinding roll SU0 in which the backsheet BS is set in a roll shape, and the unwinding roll SU1 in which the porous thin film sheet TS is continuously conveyed in a roll shape. The strip-shaped porous thin film sheet TS to be formed is laminated and supported so that the back sheet BS serves as a roll surface. In this embodiment, a polyethylene terephthalate (PET) sheet material is used as the back sheet BS.

The die head 114 sprays and applies the above-mentioned dissolution solution of the ion exchange resin toward the surface of the porous thin film sheet TS at the position supported by the backup roll 112. By applying this solution, as described above, the pores of the porous thin film sheet TS are filled with the ion exchange resin. At the same time, the ion exchange resin enters the gap between the back sheet BS and the porous thin film sheet TS, and the precursor of the thin film layer of the ion exchange resin (hereinafter referred to as resin thin film layer IS) is formed into the porous thin film sheet TS. In addition to forming on the back surface of the resin thin film layer IS, a precursor of the resin thin film layer IS is also formed on the surface of the resin thin film layer IS. The precursor of the resin thin film layer IS becomes a solid resin thin film layer IS by subsequent drying. In the production of the electrolyte membrane of the present embodiment, the solution of the ion exchange resin is discharged from the die head 114 so that the resin thin film layer IS on the front and back surfaces of the porous thin film sheet TS has a thickness of about 1 μm.

The drying portion 120 uses a heater or a warm air blower (not shown) in the drying portion to dry a porous thin film sheet TS in which the pores are filled with an ion exchange resin and the resin thin film layer IS is formed on the front and back surfaces of the thin film. , Evaporate the solvent in the solution of the ion exchange resin. As a result, the filling device 100 forms the porous thin film sheet TS having the resin thin film layer IS as a solid thin film layer on the front and back surfaces in a state of being supported by the back sheet BS. As a result, the electrolyte membrane sheet TIS having the resin thin film layer IS on the front and back surfaces of the porous thin film sheet TS is created. The coating unit 110 is not limited to the die coater, and various general coaters are used for coating, and a porous thin film is placed in a container in which a solution of an ion exchange resin is stored. It is also possible to pass the back sheet BS on which the sheet TS is laminated and impregnate the solution of the ion exchange resin with the porous thin film sheet TS.

The porous thin film sheet TS (electrolyte film sheet TIS) is conveyed while being supported by the transfer rolls 122 and 124 in a state of being laminated on the back sheet BS, and is wound into a roll by the take-up roll SW1. During this winding transfer, the porous thin film sheet TS (electrolyte membrane sheet TIS) is cooled to room temperature. The unwinding roll SU1 in which the porous thin film sheet TS (electrolyte membrane sheet TIS) has been wound is conveyed to a heat treatment apparatus 200 described later, and is diverted to the unwinding roll SU2 in the apparatus. The enlarged views of the back sheet BS, the electrolyte membrane sheet TIS, and the like shown enlarged in FIG. 2 schematically show the back sheet and the like, and do not reflect the relationship of actual dimensions. The same applies to the enlarged views shown in the respective figures described later.

In step S14 of FIG. 1, following the resin filling in step S12 using the filling device 100 described above, the porous thin film sheet TS (electrolyte membrane sheet TIS) with tension is heated.

FIG. 3 is an explanatory diagram showing a schematic configuration of a heat treatment apparatus 200 for heating a porous thin film sheet accompanied by tension application. The heat treatment device 200 is a device for carrying out the step S14 of FIG. The heat treatment device 200 includes a drying section 220, and a porous thin film sheet TS (electrolyte membrane sheet TIS) that has already been cooled is placed on the drying section 220 on a transport roll 212 and a drying section 220 upstream of the drying section 220. While being supported by the downstream transport roll 222, it is continuously transported from the unwinding roll SU2.

The drying unit 220 includes a heater and a hot air blower (not shown) for heating the sheet, and a tension roll 226 between the transfer rolls 222 that transfer the porous thin film sheet TS (electrolyte membrane sheet TIS) while supporting it on the upstream and downstream sides. Has. The drying section 220 moves the tension roll 226 up and down as shown by the arrows in the drawing, so that the porous thin film sheet TS (electrolyte membrane sheet TIS) is applied with a predetermined tension during the transport process in the drying section 220. Heat. The heating temperature in the drying portion 220 is set to 70 to 150 ° C., which exceeds the load deflection temperature of the electrolyte membrane sheet TIS. Then, the heat treatment apparatus 200 adjusts the sheet unwinding speed of the unwinding roll SU2 and the sheet winding speed of the winding roll SW2, and adjusts the vertical movement of the tension roll 226 in the drying portion 220 to make it porous. A tension of 30 to 100 N / m is applied to the thin film sheet TS (electrolyte film sheet TIS) in a temperature environment of 70 to 150 ° C. for 10 to 120 seconds.

The porous thin film sheet TS (electrolyte film sheet TIS) that has undergone the above-mentioned drying treatment in the drying section 220 is wound into a roll by a winding roll SW2 via a transport roll 214 in a state of being laminated on the back sheet BS. .. During this winding transfer, the porous thin film sheet TS (electrolyte membrane sheet TIS) is cooled to room temperature. The unwinding roll SU2 in which the porous thin film sheet TS (electrolyte membrane sheet TIS) has been wound up is conveyed to the electrode layer forming apparatus 300 described later and diverted to the unwinding roll SU3 in the apparatus.

In the step S20 of FIG. 1, following the sheet heating in the step S14 using the heat treatment apparatus 200 described above, the catalyst electrode layer is formed on the porous thin film sheet TS (electrolyte membrane sheet TIS). The catalyst electrode layer is formed by a method using catalyst ink or a method of transferring a catalyst electrode sheet previously formed with catalyst ink. The catalyst ink is a mixed solution in which substantially spherical catalyst particles are dispersed in the above-mentioned ion exchange resin solution, and includes a state such as a slurry or a paste. The catalyst particles are those in which a noble metal (for example, platinum or a platinum alloy) is supported on a carrier having electron conductivity (for example, carbon particles).

FIG. 4 is an explanatory diagram showing a schematic configuration of an electrode layer forming apparatus 300 for forming a catalyst electrode layer using catalyst ink. The electrode layer forming device 300 includes a coating unit 310 and a drying unit 320. The coating unit 310 is a general die coater, and includes a backup roll 312 and a die head 314 arranged to face the backup roll 312. The backup roll 312 has a strip-shaped porous thin film sheet TS (electrolyte membrane sheet TIS) continuously conveyed from the unwinding roll SU3 in which the roll-shaped porous thin film sheet TS (electrolyte membrane sheet TIS) is set on the back sheet BS side. Support on the front side (back side).

The die head 314 ejects and applies the catalyst ink toward the surface of the porous thin film sheet TS (electrolyte film sheet TIS) at a position supported by the backup roll 112. This solution coating is narrower than the width of the porous thin film sheet TS (electrolyte membrane sheet TIS) and is intermittently applied along the transport direction. The drying unit 320 heats and dries the applied catalyst ink using a heater or a warm air blower (not shown) in the drying unit. As a result, the electrode layer forming apparatus 300 intermittently forms, for example, a catalyst electrode layer SD for a cathode on the exposed surface of the porous thin film sheet TS (electrolyte film sheet TIS). The coating unit 310 is not limited to the die coater, and various general coaters can be used.

The porous thin film sheet TS (electrolyte film sheet TIS) on which the catalyst electrode layer SD has been formed is conveyed while being supported by the transfer rolls 322 and 324 in a state of being laminated on the back sheet BS, and is rolled into a roll shape by the take-up roll SW3. It is taken up. During this winding transfer, the porous thin film sheet TS (electrolyte membrane sheet TIS) is cooled to room temperature. The unwinding roll SU3 in which the porous thin film sheet TS (electrolyte film sheet SIS) has been wound is used as an electrode layer forming apparatus 300 for forming a catalyst electrode layer SD on the other surface of the porous thin film sheet TS (electrolyte film sheet SIS). It is transported and diverted to the unwinding roll in the device. The electrode layer forming apparatus 300 for forming the catalyst electrode layer SD on the other surface of the porous thin film sheet TS (electrolyte film sheet TIS) uses the porous thin film sheet TS (electrolyte film sheet TIS) on the die head 314 on the back sheet BS side. In addition to the configuration shown in FIG. 4, when the sheet is unwound from the unwinding roll SU3, the back sheet BS is peeled off and wound, and the porous thin film sheet TS (electrolyte film) is unwound. A new backsheet BS laminating mechanism on the side of the catalyst electrode layer SD already formed on the sheet TIS) is provided on the upstream side of the die head 314. By using such an electrode layer forming apparatus 300 in combination, an electrolyte membrane sheet TIS having a catalyst electrode layer SD intermittently provided on the front and back surfaces is obtained in a state of being laminated on the back sheet BS, and the obtained electrolyte membrane sheet is obtained. The TIS is carried into a cell manufacturing apparatus (not shown), forms a gas diffusion layer, is sandwiched by a separator, and the like, and becomes a component of a fuel cell.

FIG. 5 is an explanatory diagram showing a schematic configuration of an electrode layer forming apparatus 400 for forming a catalyst electrode layer by transferring a catalyst electrode sheet. The electrode layer forming device 400 includes a transfer portion 410 and a peeling portion 420.

The transfer unit 410 includes a transfer roll 412 and a pair of transfer rolls 414. The pair of transfer rolls 414 combine the porous thin film sheet TS (electrolyte membrane sheet TIS) transported from the unwinding roll SU3 via the transport roll 412 and the catalyst electrode sheet SDS transported from the unwinding roll SU4. They are arranged so as to be sandwiched between them. The catalyst electrode sheet SDS is a sheet in which the catalyst electrode layer SD is intermittently laminated on the back sheet BS, and the catalyst electrode layer SD is formed with a width narrower than the width of the porous thin film sheet TS (electrolyte membrane sheet TIS). ing.

The pair of transfer rolls 414 press both sheets while heating to press the catalyst electrode layer SD of the catalyst electrode sheet SDS on the membrane surface of the porous thin film sheet TS (electrolyte film sheet TI S), specifically, the resin thin film layer IS. Transfer to the membrane surface. The heating temperature of the pair of transfer rolls 414 is equal to or lower than the thermal decomposition temperature of the ion exchange resin filled in the pores of the porous thin film sheet TS and the ion exchange resin constituting the resin thin film layer IS, and the phase of the catalyst. The temperature is set to a temperature equal to or higher than the transition temperature, for example, about 130 ° C. to 170 ° C. The pressure to pressurize is set to about 1 MPa to 4 MPa. As a result, for example, a catalyst electrode layer SD for a cathode is intermittently formed on the exposed surface of the porous thin film sheet TS (electrolyte film sheet TIS).

The peeling portion 420 includes a transport roll 422 and a peeling roll 424 facing each other. The peeling roll 424 cooperates with a scraper (not shown) to peel the back sheet BS in the catalyst electrode sheet SDS. The peeled porous thin film sheet TS (electrolyte film sheet TIS) is wound into a roll on the winding roll SW3 with the catalyst electrode layer SD transferred, and the back sheet BS after peeling is wound on the winding roll SUB. It is wound into a roll. The unwinding roll SU3 in which the porous thin film sheet TS (electrolyte film sheet SIS) has been wound is used as an electrode layer forming apparatus 400 for forming a catalyst electrode layer SD on the other surface of the porous thin film sheet TS (electrolyte film sheet SIS). It is transported and diverted to the unwinding roll in the device. In the electrode layer forming apparatus 400 for forming the catalyst electrode layer SD on the other surface of the porous thin film sheet TS (electrolyte film sheet TIS), the porous thin film sheet TS (electrolyte film sheet TIS) is unwound on the back sheet BS side. It is fed out from the unwinding roll SU3 so as to be on the side of the SU4, and in addition to the configuration shown in FIG. A new back sheet BS laminating mechanism on the side of the catalyst electrode layer SD already formed on the TS (electrolyte film sheet TIS) is provided on the upstream side of the transfer roll 414. By using this electrode layer forming apparatus 400 in combination, an electrolyte membrane sheet TIS having a catalyst electrode layer SD intermittently provided on the front and back surfaces was obtained in a state of being laminated on the back sheet BS, and the obtained electrolyte membrane sheet TIS was obtained. , It is carried into a cell manufacturing apparatus (not shown), forms a gas diffusion layer, is sandwiched by a separator, etc., and becomes a component of a fuel cell.

FIG. 6 is an explanatory diagram schematically showing a state of strain measurement of the electrolyte membrane sheet TIS obtained by filling the pores of the porous thin film sheet with an ion exchange resin. If the electrolyte membrane sheet TIS obtained by the heat treatment apparatus 200 shown in FIG. 3 is distorted, the electrolyte membrane sheet TIS is conveyed to the electrolyte membrane sheet TIS for forming the catalyst electrode layer SD shown in FIGS. 4 and 5. At this time, meandering due to distortion occurs. The strain resulting in meandering was measured as shown in FIG. First, the electrolyte membrane sheet TIS is unwound from the unwinding roll SU2 on which the electrolyte membrane sheet TIS has been wound, and stretched in a strip shape on the measurement plane. At this time, no tension is applied to the electrolyte membrane sheet TIS. Then, when one end (measurement end) in the longitudinal direction of the electrolyte membrane sheet TIS is aligned with the reference line provided on the measurement plane and the measurement end of the electrolyte membrane sheet TIS is separated from the reference line for 4 m in the longitudinal direction, the reference line is determined. The distance from the line to the measurement end was measured as strain. FIG. 7 is a first explanatory view showing the relationship between the treatment conditions and the strain in the heat treatment apparatus 200 for heat treatment of the electrolyte membrane sheet. FIG. 8 is a second explanatory view showing the relationship between the treatment conditions and the strain in the heat treatment apparatus 200 for heat treatment of the electrolyte membrane sheet. In the quality determination in FIGS. 7 and 8, sample products having a distortion of more than 4 mm were regarded as defective.

As shown in FIGS. 7 and 8, in order to obtain an electrolyte membrane sheet TIS with little or no strain, the pores are filled with an ion exchange resin and cooled, and the porous thin film sheet TS is an electrolyte membrane sheet. It is desirable to heat the TIS at a temperature of 70-150 ° C. That is, when heating at 50 ° C., which is lower than 70 ° C., heating is performed at a temperature lower than the load deflection temperature of the electrolyte membrane sheet TIS in which the pores of the porous thin film sheet TS are filled with an ion exchange resin having a perfluorosulfonic acid group or the like. Therefore, the sample No. Even if the heating time is as long as 120 seconds as in No. 12, distortion still occurs. It is presumed that this is because even if the electrolyte membrane sheet TIS is heated at a temperature lower than 70 ° C., the bending of the electrolyte membrane sheet TIS is insufficient and distortion cannot be suppressed. Further, when the electrolyte membrane sheet TIS is heated at a temperature of 70 to 150 ° C., even in a low tension application state of 30 N / m in a short heating time of 10 seconds, the sample No. Distortion can be reduced as in 3-6. Moreover, if the heating temperature is set to 100 to 150 ° C., even if the heating is performed for a short time of 10 seconds, the sample No. Distortion can be reduced, such as 4 to 6, 9 to 11. From these results, even if strain occurs in the manufacturing process of the electrolyte membrane sheet TIS that has been filled with the ion exchange resin in step S12, the strain can be reduced by the heat treatment in the tension-applied state in step S14. Therefore, according to the method for producing a membrane electrode assembly of the present embodiment in which steps S12 and S14 shown in FIG. 2 are performed prior to the catalyst electrode layer forming step S20, ions are exchanged in the pores of the porous thin film sheet TS. Serpentine in the transport process of the resin-filled electrolyte membrane sheet TIS can be suppressed, and breakage and wrinkles can be suppressed. In addition to this, the catalyst electrode layer SD can be suitably formed on the surface of the electrolyte membrane sheet TIS in which breakage and wrinkles are suppressed.

The present invention is not limited to the above-described embodiments, examples, and modifications, and can be realized with various configurations within a range not deviating from the gist thereof. For example, the technical features in the embodiments, examples, and modifications corresponding to the technical features in each embodiment described in the column of the outline of the invention may be used to solve some or all of the above-mentioned problems. , It is possible to replace or combine as appropriate to achieve some or all of the above effects. Further, if the technical feature is not described as essential in the present specification, it can be deleted as appropriate.

In the above-described embodiment, the electrolyte membrane sheet TIS is delivered from the filling device 100 to the heat treatment device 200 via the take-up roll SW1, but even if it is not taken up by the take-up roll SW1. good. For example, the filling device 100 and the heat treatment device 200 are installed side by side, and a plurality of transfer rollers are provided between the filling device 100 and the heat treatment device 200 so that a sheet transfer path in which the sheet transfer direction is inverted up and down is formed. Installed above and below. Then, the electrolyte membrane sheet TIS is naturally cooled or cooled by cold air while being conveyed through such an upside-down sheet transport path, and the cooled electrolyte membrane sheet TIS is directly sent to the drying portion 220 of the heat treatment apparatus 200. , May be transported.

In the above-described embodiment, the catalyst electrode layer SD is formed on each side of the electrolyte membrane sheet TIS, but the catalyst electrode layer SD may be formed on the front and back surfaces of the electrolyte membrane sheet TIS at the same time.

100 ... Filling device 110 ... Coating part 112 ... Backup roll 114 ... Die head 120 ... Drying part 122, 124 ... Transfer roll 200 ... Heat treatment device 212, 214 ... Transfer roll 220 ... Drying part 222 ... Transfer roll 226 ... Tension roll 300 ... Electrode layer forming device 310 ... Coating part 312 ... Backup roll 314 ... Die head 320 ... Drying part 322,324 ... Transfer roll 400 ... Electrode layer forming device 410 ... Transfer part 412 ... Transfer roll 414 ... Transfer roll 420 ... Peeling part 422 ... Transfer roll 424 ... Peeling roll BS ... Back sheet SU0 ... Unwinding roll SU1 ... Unwinding roll SU2 ... Unwinding roll SU3 ... Unwinding roll SU4 ... Unwinding roll SUB ... Winding roll SW1 ... Winding roll SW2 ... Winding Roll SW3 ... Winding roll TIS ... Electrolyte film sheet TS ... Porous thin film sheet IS ... Resin thin film layer SD ... Catalyst electrode layer SDS ... Catalyst electrode sheet

Claims (1)

This is a method for manufacturing a membrane electrode assembly.
The porous thin film having the ion exchange resin filled in the pores of the porous thin film and having the thin film layer of the ion exchange resin on the front and back surfaces of the thin film is dried to form an electrolyte film, and then the electrolyte film is cooled to room temperature. And the process to do
A step of applying a tension of 30 to 100 N / m to the cooled electrolyte membrane in a temperature environment of 70 to 150 ° C. for 10 to 120 seconds.
A step of forming a catalyst electrode layer on the membrane surface of the electrolyte membrane to which the tension is applied is provided.
A method for manufacturing a membrane electrode assembly.

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