Orthodontic exchange manufacturing method and orthodontic exchange membrane manufactured thereby

Abstract

The present invention relates to a method for manufacturing an ion exchange membrane capable of efficiently producing a relatively thick ion exchange membrane, and to an ion exchange membrane manufactured thereby. A first ion exchange membrane solution, a support film, and a second ion exchange membrane solution are sequentially laminated on the upper surface of a back film, and the back film is separated to manufacture the ion exchange membrane. The method has the effect of facilitating the attachment of the support film through a first drying step and facilitating the separation by inducing shrinkage of the back film through a second drying step.

Description

Technology Field

[0001] The present invention relates to a method for manufacturing an ion exchange membrane and an ion exchange membrane manufactured thereby, and more specifically, to a method for manufacturing an ion exchange membrane capable of efficiently manufacturing a relatively thick ion exchange membrane and an ion exchange membrane manufactured thereby. Background Technology

[0003] Prior art documents 001 to 004 are inventions or papers that have a technical relationship with the present invention, prior art document 001 is a patent regarding a method for manufacturing an ion exchange membrane, prior art document 002 is a patent regarding a method for manufacturing an ion exchange membrane, prior art document 003 is a patent regarding a method for manufacturing a copolymer for manufacturing an ion exchange membrane, and prior art document 004 is a study (paper) regarding the manufacture of an ion exchange membrane for a fuel cell using direct methane with polyvinyl alcohol.

[0004] Prior art documents 001 to 004 are similar to the present invention in that they disclose a method for manufacturing an ion exchange membrane or an ion exchange membrane, but they differ in that they do not disclose a specific method for manufacturing an ion exchange membrane with a relatively thick thickness. Prior art literature

[0006] Prior Art 001 : KR 10-2012-0074365 A (Publication Date 2012.07.06) Prior Art 002 : KR 10-2012-0017554 A (Publication Date 2012.02.29) Prior Art 003 : KR 10-2011-0010960 A (Publication Date 2011.02.08) Prior Art 004 : A Study on the Preparation of Ion Exchange Membranes for Direct Methane Fuel Cells Using Polyvinyl Alcohol (Lim Ji-won, Cheon Se-won, Jeon Ji-hyun, Nam Sang-yong, The Korean Membrane Society Volume 13 Issue 3 / Pages.191-199 / 2003) The problem to be solved

[0007] The present invention relates to a method for manufacturing an ion exchange membrane capable of efficiently manufacturing a relatively thick ion exchange membrane, and an ion exchange membrane manufactured thereby. means of solving the problem

[0009] The present invention has been devised to solve the problems of the prior art as described above, and comprises a transfer step (S100) in which a bag film (10) is continuously transferred in the longitudinal direction; a first coating step (S210) in which a first ion exchange solution (21) is applied to the upper surface of the bag film (10) during the transfer step (S100); a first drying step (S310) in which the bag film (10) being transferred is dried to a certain degree after the first coating step (S210); a porous support film attachment step (S400) in which a porous support film (30) is attached to the upper surface of the first ion exchange solution (21) after the first drying step (S310); a second coating step (S220) in which a second ion exchange solution (22) is applied to the upper surface of the porous support film (30) after the porous support film attachment step (S400); and the After the second coating step (S220), the method includes a second drying step (S320) in which the bag film (10) being transported is completely dried to shrink the bag film (10), thereby separating the ion exchange membrane (40) composed of the first ion exchange solution (21), the porous support film (30), and the second ion exchange solution (22) that are bonded to each other.

[0010] The present invention has been devised to solve the problems of the prior art as described above, and the first coating step (S210) comprises a first placement step (S211) of placing the first ion exchange solution raw material (23) on the upper surface of the bag film (10), and a first casting step (S212) of spreading the first ion exchange solution raw material (23) on the upper surface of the bag film (10) after the first placement step (S211).

[0011] The present invention has been devised to solve the problems of the prior art as described above, and the first drying step (S310) is performed by passing the bag film (10) through the interior of a primary dryer (71) in the shape of a tube with both sides open.

[0012] The present invention has been devised to solve the problems of the prior art as described above, and the porous support film attachment step (S400) is performed by bringing the end of the porous support film (30) wound on the porous support film roll (31) into contact with the upper surface of the first ion exchange solution (21), and causing the porous support film roll (31) to unwind by the transport of the back film (10).

[0013] The present invention has been devised to solve the problems of the prior art as described above, and the second coating step (S220) comprises a second placement step (S221) of placing the second ion exchange solution raw material (24) on the upper surface of the porous support film (30), and a second casting step (S222) of spreading the second ion exchange solution raw material (24) on the upper surface of the bag film (10) after the second placement step (S221).

[0014] The present invention has been devised to solve the problems of the prior art as described above, and relates to an ion exchange membrane manufactured by the ion exchange membrane manufacturing method as described above. Effects of the invention

[0016] According to the method for manufacturing an ion exchange membrane according to various embodiments of the present invention as described above and the ion exchange membrane manufactured thereby, the first ion exchange solution is dried to a certain degree through a first drying step to gel and generate adhesive force, and then the porous support film is attached to the upper surface of the first ion exchange solution by bringing the end of the porous support film into contact with the surface of the first ion exchange solution, so that the porous support film can be attached to the upper surface of the first ion exchange solution by only transporting the bag film without any separate additional process or power.

[0017] In addition, according to the present invention, by adjusting the position of the first dryer, the degree to which the first ion exchange solution is dried in the first drying step can be controlled.

[0018] In addition, according to the present invention, by completely drying the first ion exchange solution and the second ion exchange solution through the second drying step and inducing shrinkage of the back film acting as a substrate, the separation of the manufactured ion exchange membrane and the back film is induced, thereby enabling the more efficient manufacturing of the ion exchange membrane.

[0019] In addition, according to the present invention, by changing the direction in which the bag film is transported through a direction changing roller without using a secondary dryer, the first drying step and the second drying step are performed simultaneously in the primary dryer, thereby having the effect of reducing power consumption compared to the case where the first drying step and the second drying step are performed individually. Brief explanation of the drawing

[0021] FIGS. 1 to 3 are flowcharts of a method for manufacturing an ion exchange membrane according to various embodiments of the present invention. FIG. 4 is a schematic diagram of the process of a method for manufacturing an ion exchange membrane according to the present invention. FIG. 5 is a perspective view of a device in which the transfer step, the first coating step, and the first drying step of the present invention are performed. FIG. 6 is a perspective view of a device in which the support film attachment step of the present invention is performed. FIG. 7 is an enlarged cross-sectional view of the porous support film of the present invention. FIG. 8 is a schematic diagram of the process of a method for manufacturing an ion exchange membrane using the stress relief roller of the present invention. FIG. 9 is a schematic diagram of the process of an embodiment in which the first drying step and the second drying step are performed using only the first dryer of the present invention. Specific details for implementing the invention

[0022] A method for manufacturing an ion exchange membrane according to various embodiments of the present invention and an ion exchange membrane manufactured thereby will be described in detail below with reference to the attached drawings.

[0024] (Example 1-1) The present invention relates to a method for manufacturing an ion exchange membrane, comprising: a transfer step (S100) in which a bag film (10) is continuously transferred in the longitudinal direction; a first coating step (S210) in which, during the transfer step (S100), a first ion exchange solution (21) comprising a first ion exchange resin and a solvent, which are raw materials for the first ion exchange solution, is applied to the upper surface of the bag film (10); a first drying step (S310) in which, after the first coating step (S210), the bag film (10) being transferred is dried to a certain degree; a porous support film attachment step (S400) in which, after the first drying step (S310), a porous support film (30) is attached to the upper surface of the first ion exchange solution (21); and, after the porous support film attachment step (S400), a second ion exchange solution raw material is applied to the upper surface of the porous support film (30). The method includes a second coating step (S220) for applying a second ion exchange solution (22) containing a second ion exchange resin and a solvent, and a second drying step (S320) for completely drying the bag film (10) being transported after the second coating step (S220), shrinking the bag film (10), and separating the ion exchange membrane (40) composed of the first ion exchange solution (21), the porous support film (30), and the second ion exchange solution (22) that are bonded together.

[0025] (Example 1-2) The present invention relates to a method for manufacturing an ion exchange membrane, wherein in Example 1-1, the first ion exchange solution (21) and the second ion exchange solution (22) are of the same type.

[0026] (Examples 1-3) The present invention relates to a method for manufacturing an ion exchange membrane, wherein in Example 1-2, the first ion exchange solution (21) and the second ion exchange solution (22) are cation ion exchange solutions.

[0027] (Examples 1-4) The present invention relates to a method for manufacturing an ion exchange membrane, wherein in Example 1-2, the first ion exchange solution (21) and the second ion exchange solution (22) are anion exchange solutions.

[0028] (Examples 1-5) The present invention relates to a method for manufacturing an ion exchange membrane, wherein in Example 1-1, the first ion exchange solution (21) and the second ion exchange solution (22) are of different types.

[0029] (Examples 1-6) The present invention relates to a method for manufacturing an ion exchange membrane, wherein in Example 1-1, the bag film (10) is made of PET (Polyethylene terephthalate).

[0030] (Examples 1-7) The present invention relates to a method for manufacturing an ion exchange membrane, wherein in Example 1-1, the porous support film (30) is manufactured from at least one of PE (Polyethylene), a porous polymer film, a woven fabric, and a nonwoven fabric.

[0031] (Examples 1-8) The present invention relates to a method for manufacturing an ion exchange membrane, wherein in Example 1-7, the porous support film (30) is manufactured from UHMWPE (Ultra High Molecular Weight PE).

[0032] The present invention (Examples 1-1 to 1-8) is described in detail.

[0033] The method for manufacturing an ion exchange membrane according to the present invention is devised to manufacture an ion exchange membrane in a relatively simple manner. This is because the thickness of the ion exchange membrane manufactured using the present invention is relatively thick, and thereby, the ion exchange membrane can be manufactured more simply while omitting several processes used in conventional manufacturing methods.

[0034] An ion exchange membrane is a membrane capable of ion exchange. Ion exchange is a phenomenon in which ions within a substance are released and ions from the solution are adsorbed onto the substance when the substance comes into contact with an aqueous electrolyte solution. Ion exchange membranes utilize this exchange phenomenon to allow only specific ions to pass through. Ion exchange membranes are used in various industrial fields. For example, they are used in fuel cells, hydrogen production, and battery fields; in particular, the application of ion exchange membranes in the energy sector is expected to contribute to the production and storage of clean energy. If the thickness of an ion exchange membrane is too thin, defects may occur, leading to problems such as ions intended for separation passing through the membrane. Therefore, this invention aims to solve these problems by using a relatively thick ion exchange membrane, and describes a method for manufacturing a relatively thick ion exchange membrane.

[0035] In the transfer step (S100) included in the present invention, the back film (10), which is continuously transferred in the longitudinal direction, serves as a substrate for manufacturing an ion exchange membrane. More specifically, in the present invention, an ion exchange membrane is laminated and manufactured on the upper surface of the back film (10), and in the second drying step (S320), the back film (10) and the ion exchange membrane are separated from each other to finally manufacture the ion exchange membrane. The transfer step (S100) is continuously performed while all steps included in the present invention are being carried out.

[0036] The first ion exchange solution (21) applied to the upper surface of the back film (10) in the first coating step (S210) may be a cation ion exchange solution or an anion ion exchange solution. Additionally, the second ion exchange solution (22) applied to the upper surface of the porous support film (30) in the second coating step (S220) may also be a cation ion exchange solution or an anion ion exchange solution. The solvents forming the first ion exchange solution and the second ion exchange solution may be known solvents (water, methanol, acetonitrile, etc.), and the first ion exchange resin and the second ion exchange resin may be formed from known cation resins or anion resins having ion exchange functional groups. If both the first ion exchange solution (21) and the second ion exchange solution (22) are cation ion exchange solutions, the ion exchange membrane that is finally manufactured becomes a cation ion exchange membrane, and if both the first ion exchange solution (21) and the second ion exchange solution (22) are anion ion exchange solutions, the ion exchange membrane that is finally manufactured becomes an anion ion exchange membrane. If either of the first ion exchange solution (21) and the second ion exchange solution (22) is a cation ion exchange solution and the other is an anion ion exchange solution, the ion exchange membrane that is finally manufactured becomes a bipolar ion exchange membrane.

[0037] The material of the bag film (10) transported in the transport step (S100) may be PET (Polyethylene Terephthalate). When PET is used as a sheet, it has excellent strength and has a heat deformation temperature of about 240 degrees Celsius, making it one of the types with high heat resistance among various polymers. Considering economic efficiency and processability, and taking into account this heat resistance, it may be preferable for the material of the bag film (10) to be PET. However, the present invention does not limit the material of the bag film (10) to PET, and the bag film (10) may be manufactured from various raw materials.

[0038] The porous support film (30) is intended to separate and support the first ion exchange solution (21) and the second ion exchange solution (22) from each other, thereby improving the durability of the ion exchange membrane produced at the end. The material of the porous support film (30) may be PE (Polyethylene). However, the present invention is not limited to PE as the material of the porous support film (30), and the porous support film (30) may be manufactured from various raw materials. For example, the porous support film (30) may be manufactured from various polymer films having porosity, or woven fabrics, nonwoven fabrics, etc., which also have porosity.

[0039] When the porous support film (30) is manufactured from PE, it can be manufactured from UHMWPE (Ultra High Molecular Weight PE) among various types of PE.

[0040] The thickness of the first ion exchange solution (21) applied to the upper surface of the back film (10) in the first application step (S210) and the second ion exchange solution (22) applied to the upper surface of the porous support film (30) in the second application step (S220) may be maintained at a specific value, and the thickness of the first ion exchange solution (21) and the second ion exchange solution (22) may be changed to various values ​​for design or other reasons.

[0042] (Example 2-1) The present invention relates to a method for manufacturing an ion exchange membrane, wherein in Example 1-1, the first coating step (S210) comprises a first placement step (S211) of placing the first ion exchange solution raw material (23) on the upper surface of the bag film (10), and a first casting step (S212) of spreading the first ion exchange solution raw material (23) on the upper surface of the bag film (10) after the first placement step (S211).

[0043] (Example 2-2) The present invention relates to a method for manufacturing an ion exchange membrane, wherein in Example 2-1, the first casting step (S212) applies the first ion exchange solution (21) to a thickness of 1,000 microns or less.

[0044] (Example 2-3) The present invention relates to a method for manufacturing an ion exchange membrane. In Example 2-1, in the first casting step (S212), the first ion exchange solution raw material (23) is formed in the width direction on the upper surface of the bag film (10) which is transported in the length direction, and is spread to a predetermined thickness by a first thickness control part (51) which is spaced a certain distance from the upper surface of the bag film (10).

[0045] The present invention (Examples 2-1 to 2-3) is described in detail.

[0046] As previously explained, the ion exchange membrane manufactured using the present invention is a thicker membrane compared to conventional membranes. This thick ion exchange membrane is generally derived from the thickness of the first ion exchange solution (21) and the second ion exchange solution (22). For example, in the present invention, the thickness of each of the first ion exchange solution (21) and the second ion exchange solution (22) may be 100 microns, and considering the thickness of the porous support film (30), the thickness of the finally manufactured ion exchange membrane is 200 microns or more. Such a thickness is considered a considerably thick ion exchange membrane. However, the present invention does not limit the thickness of each of the first ion exchange solution (21) and the second ion exchange solution (22) to 100 microns or less, and each ion exchange solution may have a thickness of within 1000 microns.

[0047] In the first casting step (S212), the thickness of the first ion exchange solution (21) can be controlled by a first thickness control unit (51) located on the upper surface of the bag film (10) being transported. The first thickness control unit (51) is formed in the width direction of the bag film (10) and is spaced upward from the upper surface of the bag film (10). Since the first ion exchange solution raw material (23) that is placed on the upper surface of the bag film (10) in the first placement step (S211) performed earlier is in the form of a paste or cake, the first ion exchange solution raw material (23) in the form of a paste or cake moves into the space between the moving bag film (10) and the first thickness control unit (51), and is spread on the upper surface of the bag film (10) to have a thickness equal to the gap between the bag film (10) and the first thickness control unit (51).

[0048] The first settling step (S211) can be performed through the first hopper (61). The first hopper (61) is located on the upper part of the bag film (10) and sets the first ion exchange solution (21), in the form of a paste or cake, onto the surface of the bag film (10). The width of the outlet of the first hopper (61) may be formed to be equal to or smaller than the width of the bag film (10), so as to ensure that the first ion exchange solution (21) is applied more evenly during the first casting step (S212) to be performed after the first settling step (S211).

[0049] A door that can be opened and closed may be installed at the outlet of the first hopper (61) used in the first settling step (S211) to determine whether the first ion exchange solution raw material (23) is discharged, and the door may be controlled through a control unit (100). However, the present invention is not limited to the first settling step (S211) being in which the first ion exchange solution raw material (23) is periodically supplied from the first hopper (61) and then the supply is stopped; there may also be an embodiment in which the first ion exchange solution raw material (23) is continuously supplied from the first hopper (61).

[0051] (Example 3-1) The present invention relates to a method for manufacturing an ion exchange membrane, wherein in Example 1-1, the first drying step (S310) is performed by passing the bag film (10) into a primary dryer (71) in the shape of a tube with both sides open.

[0052] (Example 3-2) The present invention relates to a method for manufacturing an ion exchange membrane, wherein in Example 3-1, the primary dryer (71) includes a heating element (80) installed in at least a part of the inner surface to generate heat.

[0053] (Example 3-3) The present invention relates to a method for manufacturing an ion exchange membrane. In Example 3-2, the heating element (80) is located on the upper inner surface or the lower inner surface of the first dryer (71), and the first dryer (71) is configured to be movable upward or downward. During the first drying step (S310), the method includes a first drying degree measurement step (S311) for measuring the drying degree of the first ion exchange solution (21), and after the first drying degree measurement step (S311), a first drying adjustment step (S312) for moving the first dryer (71) upward or downward according to the drying degree of the first ion exchange solution (21).

[0054] (Example 3-4) The present invention relates to a method for manufacturing an ion exchange membrane, wherein in Example 3-2, the method comprises a first drying degree measurement step (S311) for measuring the degree of drying of the first ion exchange solution (21) during the first drying step (S310), and a first drying adjustment step (S312) for adjusting the output of the heating unit (80) according to the degree of drying of the first ion exchange solution (21) after the first drying degree measurement step (S311).

[0055] (Example 3-5) The present invention relates to a method for manufacturing an ion exchange membrane, wherein in Example 3-3 or Example 3-4, the first drying degree measurement step (S311) is performed through a first camera (91) that photographs the first ion exchange solution (21) and a control unit (100) that measures the drying degree of the first ion exchange solution (21) using an image obtained from the first camera (91), and the first drying adjustment step (S312) adjusts the output of the heating unit (80) or adjusts the upper and lower positions of the first dryer (71) according to the measured drying degree of the first ion exchange solution (21).

[0056] The present invention (Examples 3-1 to 3-5) is described in detail.

[0057] The first drying step (S310) causes the first ion exchange solution (21) located on the upper surface of the bag film (10) to be dried to a certain degree. Here, a certain degree of drying is a degree of drying such that the bag film (10) does not shrink due to thermal deformation. Since the drying condition such that the bag film (10) does not shrink due to thermal deformation can vary depending on various variables such as the material and thickness of the bag film (10) and the speed at which the bag film (10) is transported, specific drying conditions are not described in this specification.

[0058] The first drying step (S310) can be performed through a primary dryer (71). The primary dryer (71) is in the shape of a tube with both sides open, and is configured to dry the first ion exchange solution (21) to a certain degree through the configuration of a heating element (80) installed on the inner surface to generate heat. The bag film (10) being transported to one side in the transport step (S100) is configured to pass through the interior of the primary dryer (71).

[0059] The primary dryer (71) itself may be configured to be movable upward or downward, and the heating element (80) may be located at various positions on the inner surface of the primary dryer (71), and in particular may be located at least one part of the upper surface and the lower surface of the inner surface of the primary dryer (71).

[0060] Even if the first ion exchange solution (21) is dried to a certain degree through the first drying step (S310), the degree of drying of the first ion exchange solution (21) in the first drying step (S310) may not be as desired by the user due to various factors such as environmental factors and mechanical deformation factors. This may cause defects in the ion exchange membrane manufactured according to the present invention. To prevent this, the present invention can adjust the first ion exchange solution (21) in which the first drying step (S310) was performed so that it is dried within a normal range through the first drying degree measurement step (S311) and the first drying adjustment step (S312).

[0061] The first dryness measurement step (S311) can be performed through a first camera (91) that photographs the first ion exchange solution (21) and a control unit (100). The first camera (91) photographs and outputs the surface of the first ion exchange solution (21), and the control unit (100) can quantify the dryness of the first ion exchange solution (21) by comparing the surface image of the first ion exchange solution (21) obtained through the first camera (91) with the surface image of the first ion exchange solution (21) according to the previously photographed and stored dryness level. If the degree of drying of the first ion exchange solution (21) is not within the normal range, the control unit (100) can increase the output of the heating element (80) located inside the first dryer (71) or adjust the upper and lower position of the first dryer (71) so that the heating element (80) of the first dryer (71) moves closer to the first ion exchange solution (21). To perform the above-described operation, the control unit (100) may be configured to transmit and receive data by being connected to the first camera (91) via a wired or wireless connection. The control unit (100) may be implemented as an electronic device or an electronic device including said electronic device programmed to compare an image acquired from the first camera (91) with a stored image and to control the first dryer (71) according to the result of the comparison.

[0062] The first dryer (71) may include not only a heating element (80) but also a blower. That is, in the present invention, the first drying step (S310) can dry the first ion exchange solution (21) to a certain degree using air as well as heat.

[0064] (Example 4-1) The present invention relates to a method for manufacturing an ion exchange membrane. In Example 1-1, the porous support film attachment step (S400) is performed by bringing the end of the porous support film (30) wound on the porous support film roll (31) into contact with the upper surface of the first ion exchange solution (21), and by unwinding the porous support film roll (31) by the transport of the back film (10).

[0065] (Example 4-2) The present invention relates to a method for manufacturing an ion exchange membrane, wherein in Example 4-1, the porous support film roll (31) is configured to be movable in at least one of the up-down direction and the left-right direction, and during the porous support film attachment step (S400), the porous support film state measurement step (S410) for measuring the state of the porous support film (30) that is unwound from the porous support film (30) and not attached to the first ion exchange solution (21), and during the porous support film attachment step (S400), the porous support film roll movement step (S420) for moving the porous support film roll (31) so that the corresponding part sags to a certain degree when the tension of the porous support film (30) that is unwound from the porous support film (30) and not attached to the first ion exchange solution (21) is maintained taut, is included.

[0066] The present invention (Examples 4-1 to 4-2) is described in detail.

[0067] In the porous support film attachment step (S400), the porous support film (30) is placed on the upper surface of the first ion exchange solution (21). However, since the bag film (10) in the present invention is continuously transported at a constant speed, the porous support film (30) is wound onto the porous support film roll (31), and then the end of the wound porous support film (30) is brought into contact with the first ion exchange solution (21). Since the first ion exchange solution (21) is not completely dried but is only dried to a certain degree and is in a gelled state, the first ion exchange solution (21) has a certain degree of adhesive strength. Accordingly, when the end of the porous support film (30) wound on the upper part of the first ion exchange solution (21) is attached, as the back film (10) moves, the porous support film (30) wound on the porous support film roll (31) is unwound, and the unwound porous support film (30) is adhered to the upper surface of the first ion exchange solution (21).

[0069] (Example 5-1) The present invention relates to a method for manufacturing an ion exchange membrane, wherein in Example 1-1, the second coating step (S220) comprises a second placement step (S221) of placing the second ion exchange solution raw material (24) on the upper surface of the porous support film (30), and a second casting step (S222) of spreading the second ion exchange solution raw material (24) on the upper surface of the porous support film (30) after the second placement step (S221).

[0070] (Example 5-2) The present invention relates to a method for manufacturing an ion exchange membrane, wherein in Example 5-1, the second coating step (S220) involves applying the second ion exchange solution (22) to a thickness of 1000 microns or less.

[0071] (Example 5-3) The present invention relates to a method for manufacturing an ion exchange membrane. In Example 5-1, in the second casting step (S222), the second ion exchange solution raw material (24) is formed in the width direction on the upper surface of the bag film (10) which is transported in the length direction, and is spread to a predetermined thickness by a second thickness control part (52) which is spaced a certain distance from the upper surface of the bag film (10).

[0072] The present invention (Examples 5-1 to 5-3) is substantially identical to the first coating step (S210), the first settling step (S211), and the first casting step (S212) described above, except that the location where the second ion exchange solution (22) is applied is the upper surface of the porous support film (30), so a separate description is omitted. The second casting step (S222) is substantially identical to the first thickness control unit (51), but is performed by a second thickness control unit (52) that is spaced upward by a certain amount from the upper surface of the moving porous support film (30).

[0074] (Example 6-1) The present invention relates to a method for manufacturing an ion exchange membrane. In Example 1-1, the back film (10) has both ends wound on a first roller (11) and a second roller (12), respectively, and the transfer step (S100) is performed by rotating the first roller (11) in a winding direction and rotating the second roller (12) in an unwinding direction.

[0075] (Example 6-2) The present invention relates to a method for manufacturing an ion exchange membrane, wherein in Example 6-1, the first roller (11) and the second roller (12) are each connected to a separate motor and rotate.

[0076] (Example 7-1) The present invention relates to a method for manufacturing an ion exchange membrane, wherein in Example 6-1, the tension maintaining step (S110) for controlling the tension of the bag film (10) is included during the transfer step (S100).

[0077] (Example 7-2) The present invention relates to a method for manufacturing an ion exchange membrane, wherein in Example 7-1, the tension maintaining step (S110) includes a tension measuring step (S111) for measuring the tension of the bag film (10), and a tension adjusting step (S112) for adjusting the gap between the first roller (11) and the second roller (12) or adjusting the rotational speed of the first roller (11) and the second roller (12) based on the tension of the bag film (10) measured in the tension measuring step (S111).

[0078] The present invention (Examples 6-1 to 7-2) is described in detail.

[0079] The first roller (11) and the second roller (12) are each connected to a motor. The first roller (11) and the second roller (12) rotate to perform the transfer step (S100). There may be an embodiment in which the first roller (11) and the second roller (12) are connected to a single motor using a belt, and the first roller (11) and the second roller (12) are rotated by a single motor; however, this method makes it difficult to control the rotational speed of each of the first roller (11) and the second roller (12). Therefore, in the present invention, the first roller (11) and the second roller (12) are each individually connected to a motor, and the rotational speed of each of the first roller (11) and the second roller (12) is controlled by controlling the individual motors.

[0080] A back film (10) is wound on each of the first roller (11) and the second roller (12), and as each roller rotates, the amount of back film (10) wound on the first roller (11) and the amount of back film (10) wound on the second roller (12) differ from each other. This means that the load borne by each motor changes, and even if the rotational speeds of the first roller (11) and the second roller (12) are controlled by the same command value in each motor, the actual rotational speeds of the first roller (11) and the second roller (12) may differ depending on the change in load, which may result in a problem of reduced tension of the back film (10). To overcome this, a tension maintenance step (S110) that controls the tension of the back film (10) is performed during the transfer step (S100).

[0081] The tension maintenance step (S110) can be performed by a tension measurement step (S111) for measuring the tension of the back film (10) and a tension adjustment step (S112).

[0082] The tension measurement step (S111) measures the tension of the back film (10) by using a camera or an infrared sensor to measure the degree of sagging of the back film (10). If it is determined in the tension measurement step (S111) that the degree of sagging of the back film (10) exceeds a reference value, the control unit (100) can adjust the distance between the first roller (11) and the second roller (12) or adjust the rotational speed of the first roller (11) and the second roller (12) based on the tension of the back film (10) measured in the tension measurement step (S111). To do this, the first roller (11) and the second roller (12) can move so that at least one of them moves closer to each other or moves further apart. In addition to this method, the tension of the back film (10) can be adjusted by increasing the rotational speed of the first roller (11) or decreasing the rotational speed of the second roller (12).

[0083] The method of adjusting the gap between the first roller (11) and the second roller (12) in the tension adjustment step (S112) is used when there is no separate roller located between the first roller (11) and the second roller (12), such as the direction change roller (14) to be described later. When a separate roller is located between the first roller (11) and the second roller (12) and the direction in which the back film (10) is transported is changed, the tension of the back film (10) can be adjusted by changing the position of the roller between the first roller (11) and the second roller (12).

[0084] (Example 8-1) The present invention relates to a method for manufacturing an ion exchange membrane, wherein in Example 1-1, the second drying step (S320) is performed by passing the bag film (10) into a secondary dryer (72) in the shape of a tube with both sides open.

[0085] (Example 8-2) The present invention relates to a method for manufacturing an ion exchange membrane, wherein in Example 8-1, the secondary dryer (72) includes a heating element (80) installed in at least a part to generate heat.

[0086] (Example 8-3) The present invention relates to a method for manufacturing an ion exchange membrane, wherein in Example 8-2, the heating element (80) is located on the upper inner surface or the lower inner surface of the secondary dryer (72), and the secondary dryer (72) is configured to be movable upward or downward, and during the second drying step (S320), the method includes a second drying degree measurement step (S321) for measuring the degree of drying of the second ion exchange solution (22), and after the second drying degree measurement step (S321), a second drying adjustment step (S322) for moving the secondary dryer (72) upward or downward according to the degree of drying of the second ion exchange solution (22).

[0087] (Example 8-4) The present invention relates to a method for manufacturing an ion exchange membrane, wherein in Example 8-2, the second drying step (S320) includes a second drying degree measurement step (S321) for measuring the degree of drying of the second ion exchange solution (22), and a second drying adjustment step (S322) for adjusting the output of the heating unit (80) according to the degree of drying of the second ion exchange solution (22) after the second drying degree measurement step (S321).

[0088] (Example 8-5) The present invention relates to a method for manufacturing an ion exchange membrane, wherein in Example 8-3 or Example 8-4, the second drying degree measurement step (S321) is performed through a second camera (92) that photographs the second ion exchange solution (22) and a control unit (100) that measures the drying degree of the second ion exchange solution (22) using an image obtained from the second camera (92), and the second drying adjustment step (S322) adjusts the output of the heating unit (80) or adjusts the upper and lower position of the secondary dryer (72) according to the measured drying degree of the second ion exchange solution (22).

[0089] The present invention (Examples 8-1 to 8-5) is identical to the first drying step (S310), the first drying degree measurement step (S311), and the first drying adjustment step (S312) described above, except that the second ion exchange solution (22) is dried. Since the second drying step (S320) is performed through a second dryer (72) substantially identical to the first dryer (71) after the second ion exchange solution (22) is applied to the upper surface of the porous support film (30), a separate description of the process in which the second drying step (S320) is performed is omitted. The second dryer (72) may also have a cylindrical shape with both sides open and may include a heating element and a blower inside, and is configured to allow the bag film (10) being transported inside to pass through.

[0090] When the second drying step (S320) is performed, the second ion exchange solution (22) is completely dried. At this time, the bag film (10) is also exposed to an environment above a certain temperature for a certain period of time, causing the bag film (10) to shrink. Accordingly, the bag film (10) is separated from the first ion exchange solution (21), porous support film (30), and second ion exchange solution (22) laminated on one side, and thus, the ion exchange membrane can be finally manufactured through the second drying step (S320) without a separate separation process.

[0092] (Example 9-1) The present invention relates to a method for manufacturing an ion exchange membrane. In Example 3-1, after the second coating step (S220) is performed, the position of the back film (10) being transported via the direction change roller (14) is changed by 180 degrees, and the second drying step (S320) involves passing the back film (10) into the first dryer (71) to completely dry the first ion exchange solution (21) and the second ion exchange solution (22).

[0093] (Example 9-2) The present invention relates to a method for manufacturing an ion exchange membrane, wherein in Example 9-1, the direction changing roller (14) contacts the back film (10) so that the direction-changed back film (10) is positioned below the back film (10) that has not been changed direction, and the first dryer (71) includes a heating element (80) located on the lower side of the inner surface.

[0094] (Example 9-3) The present invention relates to a method for manufacturing an ion exchange membrane, wherein in Example 9-2, the heating element (80) is located on the upper side of the inner surface of the primary dryer (71), and the distance between the heating element (80) located on the lower side and the second ion exchange solution (22) located on the direction-shifted back film (10) is closer than the distance between the heating element (80) located on the upper side and the first ion exchange solution (21) located on the direction-shifted back film (10).

[0095] Unlike the previously described Examples 8-1 to 8-5, the present invention (Examples 9-1 to 9-3) completely dries the first ion exchange solution (21) and the second ion exchange solution (22) using a first dryer (71) without using a second dryer (72). To this end, the direction change roller (14) comes into contact with the back film (10) after the second coating step (S220) is performed, thereby changing the direction in which the back film (10) is transported. At this time, if the direction change roller (14) comes into contact with the second ion exchange solution (22) located on the surface, the second ion exchange solution (22) may adhere to the surface of the direction change roller (14), which may cause a deterioration in the quality of the ion exchange membrane produced finally. To prevent this, the direction change roller (14) comes into contact with the back film (10) and changes the direction in which the back film (10) is transported.

[0096] In the present invention, since the ion exchange membrane is manufactured in such a manner that the first ion exchange solution (21), the porous support film (30), the second ion exchange solution (22), etc. are laminated on the upper surface of the back film (10), the back film (10) with the direction changed is positioned below the back film (10) with the direction not changed, and the back film (10) with the direction changed is inserted into the first dryer (71) to perform the second drying step (S320).

[0097] The present invention performs the first drying step (S310) and the second drying step (S320) simultaneously using the direction changing roller (14) and the first dryer (71), thereby consuming power more efficiently and reducing the size of the space required for the process by not using an additional dryer, while also having an economic effect.

[0098] As previously explained, the first drying step (S310) dries the first ion exchange solution (21) to a certain extent, and the second drying step (S320) completely dries the first ion exchange solution (21) and the second ion exchange solution (22). To implement this in the first dryer (71), the heating element (80) may be located on the inner lower surface. In this way, in the first drying step (S310), the distance between the heating element (80) and the first ion exchange solution (21) is far, so it is less dried, and in the second drying step (S320), the distance between the heating element (80) and the first ion exchange solution (21) and the second ion exchange solution (22) is close, so it can be completely dried.

[0099] In some cases, a heating element (80) may be provided on the inner upper surface and lower surface of the first dryer (71). In this case, in order to induce complete drying of the second ion exchange solution (22) in the second drying step (S320), the positions of the first roller (11), the direction changing roller (14), and the second roller (12) may be adjusted so that the gap between the surface of the second ion exchange solution (22) and the heating element (80) located at the bottom in the second drying step (S320) is narrower than the gap between the surface of the first ion exchange solution (21) and the heating element (80) located at the top in the first drying step (S310).

[0101] (Example 10-1) The present invention relates to a method for manufacturing an ion exchange membrane, wherein in Example 1-1, the ion exchange membrane (40) is wound using a third roller (13) during or after the second drying step (S320) and the ion exchange membrane (40) is collected in a roll form, and the ion exchange membrane (40) is collected in a roll form.

[0102] (Example 10-2) The present invention relates to a method for manufacturing an ion exchange membrane, wherein in Example 10-1, the third roller (13) is configured to be movable.

[0103] During the second drying step (S320), the ion exchange membrane (40), composed of the first ion exchange solution (21), the porous support film (30), and the second ion exchange solution (22), and the bag film (10) are separated. Since the bag film (10) is recovered by being wound through the second roller (12), a separate roller is required to collect the ion exchange membrane (40), and this roller is the third roller (13).

[0104] The third roller (13) may also be configured to be movable. This is to prevent excessive tension or sagging that may occur during the collection of the manufactured ion exchange membrane (40).

[0106] (Example 11-1) The present invention relates to a method for manufacturing an ion exchange membrane, wherein Example 1-1 includes a stress removal step (S120) for removing residual stress of the back film (10) prior to the first coating step (S210).

[0107] The present invention relates to the removal of residual stress in a back film wound on a first roller. The first roller forms a cylindrical shape, and a back film is continuously stacked and stored on the outer surface of the first roller. That is, during the storage process, the reinforcing sheet contains residual stress that tends to bend in one direction. Therefore, the residual stress in the back film must be removed through a stress removal step.

[0108] The stress relief step (S120) is performed through a stress relief unit. The stress relief unit forms a stress relaxation roller (15). The stress relaxation roller (15) induces deformation in the opposite direction to the winding direction of the back film (10) wound on the first roller (11).

[0109] It is preferable that the outer diameter of the stress relaxation roller (15) be formed to be smaller than the outer diameter of the first roller (11). Additionally, the stress relaxation roller (15) may be formed with a heating device that maintains a constant roller temperature and / or a humidifying device that sprays moisture onto the outer surface of the roller. The heating device and the humidifying device can achieve a rapid stress relief effect.

[0111] The present invention is not limited to the embodiments described above and has a diverse scope of application. Furthermore, it is understood that anyone with ordinary knowledge in the field to which the present invention pertains can make various modifications without departing from the essence of the invention as claimed in the claims. Explanation of the symbols

[0113] 10: Back film 11: 1st roller 12: 2nd roller 13: 3rd roller 14: Direction change roller 15: Stress relaxation roller 21 : 1st Ion Exchange Solution 22 : 2nd Ion Exchange Solution 23: Raw material for the 1st ion exchange solution 24: Raw material for the 2nd ion exchange solution 30: Porous support film 31: Porous support film roll 40 : Ion exchange membrane 51 : First thickness control unit 52 : 2nd thickness adjustment unit 61 : 1st hopper 62 : Hopper No. 2 71 : Primary Dryer 72 : Secondary dryer 80 : Heating element 91 : 1st camera 92 : 2nd camera 100 : Control unit

Claims

Claim 1 A transfer step (S100) in which a bag film (10) is continuously transferred in the longitudinal direction; a first coating step (S210) in which, during the transfer step (S100), a first ion exchange solution (21) comprising a first ion exchange resin and a solvent, which is a first ion exchange solution raw material (23), is applied to the upper surface of the bag film (10); a first drying step (S310) in which, after the first coating step (S210), the bag film (10) being transferred is dried to a certain degree; a porous support film attachment step (S400) in which, after the first drying step (S310), a porous support film (30) is attached to the upper surface of the first ion exchange solution (21); and, after the porous support film attachment step (S400), a second ion exchange solution raw material (24) comprising a second ion exchange resin and a solvent, which is a second ion exchange solution raw material (24), is applied to the upper surface of the porous support film (30). A method for manufacturing an ion exchange membrane comprising: a second coating step (S220) for applying a second ion exchange solution (22); a second drying step (S320) for completely drying the bag film (10) being transported after the second coating step (S220), shrinking the bag film (10), and separating the bag film (10) from the ion exchange membrane (40) composed of the first ion exchange solution (21), the porous support film (30), and the second ion exchange solution (22) that are bonded together; wherein the porous support film attachment step (S400) is performed by bringing the end of the porous support film (30) wound on the support film roll (31) into contact with the upper surface of the first ion exchange solution (21), and causing the support film roll (31) to unwind by the transport of the bag film (10). Claim 2 A method for manufacturing an ion exchange membrane according to claim 1, wherein the first coating step (S210) comprises: a first placement step (S211) of placing the first ion exchange solution raw material (23) on the upper surface of the bag film (10); and a first casting step (S212) of spreading the first ion exchange solution raw material (23) on the upper surface of the bag film (10) after the first placement step (S211). Claim 3 A method for manufacturing an ion exchange membrane according to claim 1, wherein the first drying step (S310) is performed by passing the bag film (10) into a primary dryer (71) in the shape of a tube with both sides open. Claim 4 delete Claim 5 A method for manufacturing an ion exchange membrane according to claim 1, wherein the second coating step (S220) comprises: a second placement step (S221) of placing the second ion exchange solution raw material (24) on the upper surface of the porous support film (30); and a second casting step (S222) of spreading the second ion exchange solution raw material (24) on the upper surface of the porous support film (30) after the second placement step (S221). Claim 6 An ion exchange membrane manufactured by the method for manufacturing an ion exchange membrane according to any one of claims 1 to 3 and 5.

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