Preparation device of composite ion exchange membrane

Abstract

The utility model discloses a preparation device of a composite ion exchange membrane, which comprises an unwinding roller, a membrane preparation slurry storage tank, a crack membrane coating mechanism, a drying mechanism, a traction mechanism and a winding roller which are arranged in sequence, the reinforced base film is stripped from the reinforced base film roll, is dipped in the film preparation slurry storage tank, and is uniformly coated by scraping redundant film preparation slurry through a slit of the slit film coating mechanism; and the coated reinforced base membrane is subjected to high-temperature hot pressing through the drying mechanism to form a composite ionic membrane, and the composite ionic membrane is gradually wound on the winding roller through the traction mechanism. According to the utility model, the reinforced base membrane is dipped and coated in the membrane-making slurry storage tank, the thickness of the coating slurry of the reinforced base membrane dipped in the membrane-making slurry is controlled through the crack membrane-coating knife edge, then the reinforced base membrane enters the drying mechanism to carry out high-temperature hot pressing on the coated ionic membrane, and the hot-pressed composite ionic membrane is wound through traction, so that the operation is simple, the production efficiency is high, and the production cost is low. The composite ionic membrane is smooth in surface, uniform in thickness and excellent in performance.

Description

Technical Field

[0001] The utility model belongs to the technical field of ion exchange membranes, and in particular relates to a preparation device for a composite ion exchange membrane. Background Art

[0002] Ion exchange membrane is a membrane-like ion exchange resin. Ion exchange membranes have various structures and properties. They can usually be classified according to substrate, structure, function and use. According to the function of the ion membrane, they are mainly composed of cation exchange membranes, anion exchange membranes, special ion exchange membranes, etc.

[0003] Currently, ion exchange membrane formation methods primarily include solution casting, melt extrusion, and solution casting. Ion exchange membranes produced using different methods exhibit varying properties. Melt extrusion casting is the most mature industrialized method. For example, DuPont has used this method to produce perfluorosulfonic acid ion exchange membranes, which have been successfully applied in the chlor-alkali and fuel cell industries. However, the membrane requires post-extrusion treatment and transformation, which increases the complexity of the production process. Solution casting involves pouring a resin solution into a prepared mold, then heating to volatilize the solvent and forming the membrane. Because this method involves casting in a mold, the formed membrane is difficult to peel off and is difficult to achieve continuous production. Solution casting, in which a uniformly dispersed, stable slurry is applied on a casting machine to produce the membrane, addresses the disadvantages of melt extrusion, requiring post-film transformation, while also facilitating continuous production. However, the membrane may exhibit defects such as strong adhesion to the base membrane, making it difficult to peel off, and pinholes and spots on the membrane. In addition, perfluorosulfonic acid ion exchange membranes have many performance advantages, but there are also problems such as high resin cost and complex process. Utility Model Content

[0004] Purpose of the invention: The purpose of this utility model is to provide a device for preparing a composite ion exchange membrane, which utilizes a composite membrane resin and a reinforced base membrane to compositely prepare an ion exchange membrane. The device is simple to operate, low in cost, and has good application prospects.

[0005] Technical solution: The utility model discloses a composite ion exchange membrane preparation device, which comprises an unwinding roller, a membrane slurry storage tank, a gap coating mechanism, a drying mechanism, a traction mechanism and a winding roller, which are arranged in sequence;

[0006] Among them, the reinforced base film roll is mounted on the unwinding roller, and the reinforced base film is peeled off from the reinforced base film roll, immersed in the film-making slurry storage tank, and scraped through the slit of the slit coating mechanism to remove excess film-making slurry for uniform coating; the coated reinforced base film is subjected to high-temperature hot pressing by a drying mechanism to form a composite ion membrane, and the composite ion membrane is gradually wound on the winding roller through the traction mechanism.

[0007] Preferably, a heating element for heating the film-making slurry is provided on the side wall of the film-making slurry storage tank.

[0008] Preferably, at least one first guide roller is provided in the film-making slurry storage tank in the direction of travel of the enhanced base film, the axis height of the first guide roller is not lower than the axis height of the unwinding roller, and the enhanced base film passes from the lower side of the first guide roller and enters the slit of the slit coating mechanism.

[0009] Preferably, the drying mechanism includes a drying chamber and heating plates arranged on the bottom surface and circumference of the drying chamber. The height of the heating plates arranged on the side walls of the drying chamber is lower than the height of corresponding positions on the composite ion membrane travel path.

[0010] Preferably, a breeze heat circulation system is also provided in the drying chamber, and the breeze heat circulation system includes at least one circulating air duct arranged in the drying chamber, and the circulating air duct has a plurality of jet holes distributed along the lower side of its pipe diameter, and the inlet end of the circulating air duct is connected to the air inlet arranged on the drying chamber, and an air outlet is provided on the side wall of the drying chamber.

[0011] Preferably, the drying chamber is horizontally provided with a second guide roller and a third guide roller along the forward direction of the composite ion membrane, and a tensioning mechanism is provided in cooperation with the second guide roller or the third guide roller. The tensioning mechanism adjusts the roller gap between the second guide roller and the third guide roller, and the composite ion membrane passes through the roller gap between the second guide roller and the third guide roller with interference fit. The hot pressing pressure range to which the composite ion membrane is subjected is 1~20MPa.

[0012] Preferably, the traction mechanism includes a fourth guide roller for providing tensioning force for the composite ion membrane and a power mechanism for adjusting the rotation speed of the fourth guide roller. The traction speed of the fourth guide roller is 0.2-2 m / min.

[0013] Preferably, the coating blade width of the gap coating mechanism is 50~600μm.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. The preparation device of the utility model is to dip and coat the reinforced base membrane in a film-making slurry storage tank, pass the reinforced base membrane dipped in the film-making slurry through a gap coating knife edge to control the thickness of the coating slurry, and then enter the drying mechanism for drying for a set time, and then perform high-temperature hot pressing on the coated ion membrane. The hot-pressed composite ion membrane is wound by traction. The preparation system is simple to operate, the process flow is short, the composite ion membrane has a smooth surface, uniform thickness, and excellent performance;

[0016] 2. The composite phase of the composite ion membrane and the ion exchange resin phase have different dimensional stability due to their different molecular skeletons. The reinforced base membrane coated with the slurry is hot-pressed in a drying chamber without being completely dried, thereby improving the interlayer bonding strength of the composite ion membrane and ensuring the stability and reliability of the composite ion membrane. The composite ion membrane adopts double-sided coating composite, and the composite ion membrane has good bonding strength and high mechanical strength. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the process of preparing a composite ion exchange membrane according to an embodiment of the present invention.

[0018] Figure numerals: 100, preparation device; 1, unwinding roller; 2, reinforced base film; 3, film-making slurry storage tank; 4, first guide roller; 5, film-making slurry; 6, gap coating mechanism; 7, drying mechanism; 8, heating plate; 9, drying chamber; 10, second guide roller; 11, third guide roller; 12, high-temperature hot pressing slit; 13, circulating air duct; 14, air inlet; 15, air outlet; 16, traction mechanism; 17, winding roller; 18, composite ion membrane. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the following Figure 1 The technical solutions of the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the described embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field are within the scope of protection of the present invention.

[0020] like Figure 1 As shown, a preparation device for a composite ion exchange membrane according to an embodiment of the present invention, the preparation device 100 includes a unwinding roller 1, a film-forming slurry storage tank 3, a gap coating mechanism 6, a drying mechanism 7, a traction mechanism 16 and a winding roller 17 arranged in sequence; a heating element for heating the film-forming slurry 5 is provided on the side wall of the film-forming slurry storage tank 3, and the heating element can be an electric heating wire arranged along the side wall of the film-forming slurry storage tank 3, and the film-forming slurry 5 can be heated by the electric heating wire to maintain the film-forming slurry with reasonable fluidity; wherein, the solid content of the film-forming slurry of the ion exchange membrane is between 10% and 40%. At least one first guide roller 4 is arranged in the film-making slurry storage tank 3 in the direction of travel of the reinforced base film 2. The axis height of the first guide roller 4 is not lower than the axis height of the unwinding roller 1, so as to maintain the reinforced base film has good impregnation ability in the film-making slurry. After the reinforced base film 2 is impregnated, it passes through the lower side of the first guide roller 4 and enters the slit of the slit coating mechanism 6. The coating blade width of the slit coating mechanism 6 is 50~600µm, and the coating blade width can meet the coating operation of reinforced base films 2 of different thicknesses.

[0021] The drying mechanism 7 includes a drying chamber 9 and heating plates 8 arranged on the bottom surface and circumference of the drying chamber 9. The height of the heating plates 8 arranged on the side walls of the drying chamber 9 is lower than the height of the corresponding position of the composite ion membrane travel path. The heating temperature range of the heating plates 8 is between 60 and 150°C. A breeze heat circulation system is also provided in the drying chamber 9. The breeze heat circulation system includes at least one circulating air duct 13 arranged in the drying chamber 9. The circulating air duct 13 has multiple air injection holes distributed along the lower side of its pipe diameter. The inlet end of the circulating air duct 13 is connected to the air inlet 14 arranged on the drying chamber 9. An air outlet 15 is provided on the side wall of the drying chamber 9. Hot air enters the drying chamber 9 through the circulating air duct 13 for dispersion, heating and drying the composite ion membrane with the membrane slurry adhered to it, and maintaining the hot pressing temperature of the composite ion membrane between 150 and 300°C. Within the drying chamber 9, a second guide roller 10 and a third guide roller 11 are horizontally arranged along the direction of travel of the composite ion membrane 18. A tensioning mechanism is provided in conjunction with the second guide roller 10 or the third guide roller 11. This tensioning mechanism adjusts the high-temperature hot-pressing gap 12 between the second and third guide rollers 10, 11 to accommodate the hot-pressing of composite ion membranes of varying thicknesses. The tensioning mechanism can utilize a drive cylinder structure or a worm gear structure. The composite ion membrane 18 passes through the gap between the second and third guide rollers 10, 11, with the hot-pressing pressure applied to the composite ion membrane 18 ranging from 1 to 20 MPa. A heating device can also be provided within the second guide roller 10 or / and the third guide roller 11 to heat the second or third guide roller.

[0022] The traction mechanism includes a fourth guide roller for providing tensioning force for the composite ion membrane 18 and a power mechanism for adjusting the rotation speed of the fourth guide roller. The power mechanism adopts a drive motor and a transmission mechanism to realize power transmission. The transmission mechanism can adopt a transmission sprocket mechanism, a transmission pulley mechanism or a gear set mechanism to realize the power transmission function. The power mechanism can adjust the rotation speed of the fourth guide roller to realize the composite ion membrane 18 being wound on the winding roller 17 at a traction speed of 0.2~2m / min.

[0023] The working principle or working method of this utility model:

[0024] During operation, film-forming slurry 5 is added to the film-forming slurry storage tank 3, a reinforced base film roll is placed on the unwinding roller 1, and the reinforced base film 2 is peeled off from the reinforced base film roll to form a free end. The free end passes through the film-forming slurry storage tank 3, the drying mechanism 7, and the pulling mechanism 16 in sequence, and is gradually wound on the winding roller 17. The reinforced base film feed switch is turned on, and the pulling speed of the reinforced base film 2 is set to 0.3 m / min. At the same time, the circulating hot air switch is turned on to heat the drying mechanism 7. When the reinforced base membrane 2 is transported through the film-making slurry storage tank 3, the reinforced base membrane is fully immersed in the film-making slurry, and the reinforced base membrane immersed in the film-making slurry is scraped off with a 100-micron-high blade of the gap coating mechanism 6 to evenly coat the excess film-making slurry 5; the coated reinforced base membrane 2 is subjected to high-temperature hot pressing by the drying mechanism 7 to form a composite ion membrane 18. The set temperature of the drying chamber 9 is 110°C. After drying in the drying chamber 9 for 10 minutes, the composite ion membrane is subjected to high-temperature hot pressing at 170°C and 3MPa. The hot-pressed composite ion membrane 18 is gradually wound on the winding roller 17 via the traction mechanism 16.

[0025] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A composite ion exchange membrane preparation device, characterized in that: The preparation device (100) comprises an unwinding roller (1), a film-making slurry storage tank (3), a gap coating mechanism (6), a drying mechanism (7), a traction mechanism (16) and a winding roller (17) which are arranged in sequence; The reinforced base film roll is mounted on the unwinding roller (1), the reinforced base film (2) is peeled off from the reinforced base film roll, immersed in the film-making slurry storage tank (3), and scraped through the slit of the slit coating mechanism (6) to remove excess film-making slurry (5) for uniform coating; the coated reinforced base film (2) is subjected to high-temperature hot pressing by a drying mechanism (7) to form a composite ion membrane (18), and the composite ion membrane (18) is gradually wound on the winding roller (17) via a traction mechanism (16).

2. The device for preparing a composite ion exchange membrane according to claim 1, characterized in that: The side wall of the membrane-making slurry storage tank (3) is provided with a heating element for heating the membrane-making slurry (5).

3. The preparation device of the composite ion exchange membrane according to claim 2, characterized in that: At least one first guide roller (4) is arranged in the film-making slurry storage tank (3) in the direction of travel of the enhanced base film (2); the axis height of the first guide roller (4) is not lower than the axis height of the unwinding roller (1); the enhanced base film (2) passes through the lower side of the first guide roller (4) and enters the slit of the slit coating mechanism (6).

4. The preparation device of the composite ion exchange membrane according to claim 1, characterized in that: The drying mechanism (7) comprises a drying chamber (9) and a heating plate (8) arranged on the bottom surface of the middle and lower part of the drying chamber (9) and in the circumferential direction; the height of the heating plate (8) arranged on the side wall of the drying chamber (9) is lower than the height of the corresponding position of the composite ion membrane travel path.

5. The device for preparing a composite ion exchange membrane according to claim 4, characterized in that: The drying chamber (9) is also provided with a breeze heat circulation system, the breeze heat circulation system comprising at least one circulation air duct (13) arranged in the drying chamber (9), the circulation air duct (13) having a plurality of air jet holes distributed along the lower side of the pipe diameter, the inlet end of the circulation air duct (13) being connected to an air inlet (14) arranged on the drying chamber (9), and an air outlet (15) being arranged on the side wall of the drying chamber (9).

6. The device for preparing a composite ion exchange membrane according to claim 5, characterized in that: The drying chamber (9) is provided with a second guide roller (10) and a third guide roller (11) arranged horizontally along the forward direction of the composite ion membrane (18), and a tensioning mechanism is provided in cooperation with the second guide roller (10) or the third guide roller (11), wherein the tensioning mechanism adjusts the roller gap between the second guide roller (10) and the third guide roller (11), and the composite ion membrane (18) passes through the roller gap between the second guide roller (10) and the third guide roller (11) with interference fit, and the hot pressing pressure to which the composite ion membrane (18) is subjected is in the range of 1 to 20 MPa.

7. The device for preparing a composite ion exchange membrane according to claim 1, characterized in that: The traction mechanism comprises a fourth guide roller for providing tensioning force for the composite ion membrane (18) and a power mechanism for adjusting the rotation speed of the fourth guide roller. The traction speed of the fourth guide roller is 0.2-2 m / min.

8. The device for preparing a composite ion exchange membrane according to claim 1, characterized in that: The coating blade width of the gap coating mechanism (6) is 50-600 μm.

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