Composite diaphragm production device

Abstract

The utility model discloses a composite diaphragm production device which comprises a first unwinding and winding mechanism, a double-slit coating unit, a coagulating bath tank and a drying and conveying unit, the first unwinding and winding mechanism comprises a first unwinding shaft, PPS mesh cloth and a first winding shaft, and the double-slit coating unit adopts two slit extrusion heads to uniformly flow slurry onto the PPS mesh cloth passing through the double-slit coating unit; a plurality of pairs of paired guide rollers for the PPS mesh cloth to enter and exit from the coagulating bath tank in a reciprocating manner are arranged in the coagulating bath tank; the drying and conveying unit comprises a drying oven and two groups of conveying belts which are symmetrically arranged up and down; the left and right side edges of the formed composite diaphragm enter the drying oven to be dried under the pressing and driving of the conveying belts; a PET (Polyethylene Terephthalate) carrier tape film which synchronously enters and exits from a drying oven together with the PPS mesh cloth and is used for carrying out auxiliary bearing on a composite film on the PPS mesh cloth to prevent the composite film from being stretched and deformed and preventing the composite film from being damaged by contact pressure of a plurality of groups of guide rollers is also arranged between an inlet and an outlet of the drying and conveying unit; and the composite coating is effectively prevented from loosening or falling off from the base body.

Description

Technical Field

[0001] The utility model relates to the diaphragm manufacturing technology in hydrogen energy materials, in particular to a composite diaphragm production device. Background Art

[0002] With the transformation of the global energy structure and the continuous growth of the demand for renewable energy, hydrogen energy, as a clean energy source, has received extensive attention in its development and application. Among various hydrogen production technologies, the alkaline water electrolysis (ALK) hydrogen production technology has become an important development direction in the current hydrogen energy industry due to its advantages such as mature technology, simple operation, and relatively low cost.

[0003] In the process of alkaline water electrolysis (ALK) hydrogen production, the electrolyzer is the core equipment, and the diaphragm material in the electrolyzer is the key factor determining the electrolysis efficiency and hydrogen purity. The main function of the diaphragm is to isolate hydrogen and oxygen, prevent the formation of explosive gas mixtures, and at the same time allow the transfer of hydroxide ions (OH-). Traditional diaphragm materials, such as polyphenylene sulfide (PPS) mesh cloth, although having good chemical stability and mechanical strength, have insufficient hydrophilicity, resulting in a large internal resistance in the electrolyzer, thereby affecting the electrolysis efficiency and energy consumption.

[0004] In order to improve the hydrophilicity and ion conductivity of the diaphragm, researchers have developed a variety of composite diaphragm materials; these materials are usually composed of an organic polymer matrix and inorganic fillers, aiming to balance the hydrophilicity, mechanical strength, and ion conductivity of the diaphragm through material compounding. However, there are still some problems in the practical application of the composite diaphragms in the prior art, such as poor compatibility between the inorganic fillers and the organic matrix, easy detachment of the inorganic filler coating from the matrix material, insufficient durability of the diaphragm, etc. Moreover, in the production process of the composite diaphragm, special unwinding and rewinding mechanisms need to be configured, and it is made by coating on the PPS mesh cloth through methods such as slit coating, dipping, or knife coating; during processing, the coating is extruded from the slit head and cast onto the PPS mesh cloth, and after passing through structural units such as a water tank, an oven, and an adsorption roller, it is wound by the rewinding mechanism. However, in this process, the running tension of the diaphragm is all provided by the rewinding mechanism, which makes it difficult to control the rewinding tension. The porous structure woven by the warp and weft of the PPS mesh cloth is prone to deformation when directly subjected to a large tension, resulting in loosening or even detachment of the coating filled and attached in the mesh holes from the fibers; at the same time, when the diaphragm passes through the adsorption roller, it is easy to have a relative displacement with the adsorption roller, generating friction, and the adsorption effect of the adsorption roller will further damage the combination of the coating and the mesh cloth; the loosening or detachment of the coating from the mesh cloth will cause an increase in the resistance and a reduction in the lifespan of the composite diaphragm, and even affect the use safety. Summary of the Invention

[0005] The utility model provides a composite diaphragm production device, which can adaptively and flexibly adjust the winding tension, prevent the tension from directly stretching the composite diaphragm and causing deformation of the mesh holes of the diaphragm matrix material, effectively prevent the composite coating from loosening or falling off the matrix, maintain the consistency of the diaphragm isolation performance, and improve the product quality.

[0006] The technical solution adopted by the utility model to solve its technical problems is as follows:

[0007] A composite diaphragm production device includes a first unwinding and winding mechanism, a double-slit coating unit, a coagulation bath, and a drying and conveying unit. The first unwinding and winding mechanism includes a first unwinding shaft, a PPS mesh cloth, and a first winding shaft. The PPS mesh cloth wound on the first unwinding shaft passes through the double-slit coating unit, the coagulation bath, and the drying and conveying unit in sequence after being guided by a plurality of guide rollers, and is wound and collected by the first winding shaft.

[0008] The double-slit coating unit uses two slit extrusion heads to uniformly cast the slurry onto the PPS mesh cloth unwound by the first unwinding and winding mechanism, and the slurry is preformed into a coating after phase transformation.

[0009] A plurality of pairs of paired guide rollers for the PPS mesh cloth to reciprocate in and out of the coagulation bath are arranged in the coagulation bath. After the preformed coating on the PPS mesh cloth is impregnated multiple times in the coagulation bath, the coating undergoes non-solvent-induced phase transformation and solidifies into a shape.

[0010] The drying and conveying unit includes an oven and two sets of symmetrically arranged conveyor belts. The left and right edges of the formed coating on the PPS mesh cloth are driven by the upper and lower opposed conveyor belts and enter the oven for drying.

[0011] A PET carrier film is also arranged between the inlet and outlet of the drying and conveying unit. The PET carrier film enters and exits the oven synchronously with the PPS mesh cloth, and is used to assist in carrying the composite film on the PPS mesh cloth to prevent the composite film from stretching and deforming and prevent the multi-group guide rollers from touching and damaging the composite film. A second unwinding shaft for feeding the PET carrier film is provided at the inlet of the corresponding drying and conveying unit, and a second winding shaft for winding the PET carrier film is provided at the outlet of the drying and conveying unit. The PET carrier film wound on the second unwinding shaft passes through the drying and conveying unit after being guided by a plurality of guide rollers and is wound and collected by the second winding shaft.

[0012] Preferably, the two conveyor belts are arranged oppositely up and down and are driven by two sets of power respectively, and drive the PPS mesh cloth to horizontally pass through the oven under the support of the PET carrier film and the multi-group guide rollers.

[0013] Preferably, the double-slit coating unit uses a screw pump to pump the uniformly mixed and degassed slurry to two symmetrically arranged slit extrusion heads respectively.

[0014] Preferably, between the discharge port of the drying and conveying unit and the first winding shaft of the first unwinding and winding mechanism, there are also a plurality of discharge guide rollers for guiding the cured and formed composite film, and an arc swing roller for flattening the composite film is arranged between two of the discharge guide rollers.

[0015] Preferably, a tension sensor for real-time feedback of the tension of the PPS mesh fabric and the composite film to the first winding mechanism and maintaining the relative stability of the winding tension by controlling the winding speed is also arranged on the arc swing roller.

[0016] The beneficial effects of the present utility model are as follows:

[0017] By arranging a PET carrier film between the inlet and outlet of the drying and conveying unit, which enters and exits the oven synchronously with the PPS mesh fabric, assists in carrying the composite film on the PPS mesh fabric to prevent the composite film from being stretched and deformed, and prevents the composite film from being touched and damaged by multiple groups of guide rollers, and the tension sensor on the arc swing roller real-time feedbacks the tension of the PPS mesh fabric and the composite film to the first unwinding and winding mechanism, and maintains a micro-tension winding by controlling the winding speed. The production process of the composite diaphragm with micro-tension winding and low tensile damage reduces the damage to the microscopic structure of the coating during the production process of the composite diaphragm, reduces the tensile deformation caused by the tension to the composite diaphragm, can effectively prevent the coating from loosening or even falling off from the fiber, effectively extends the service life of the composite diaphragm, and enhances the conductivity and use safety of the composite diaphragm. Description of the Drawings

[0018] Figure 1 It is a schematic diagram of the system principle of the present utility model. Detailed Embodiments

[0019] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative labor modifications fall within the protection scope of the present utility model.

[0020] A composite diaphragm production device, such as Figure 1As shown, it comprises a first unwinding and rewinding mechanism 1, a double-narrow coating unit 2, a coagulation bath tank 3 and a drying and conveying unit 4. The first unwinding and rewinding mechanism 1 comprises a first unwinding shaft 1a, a PPS mesh cloth 1b and a first rewinding shaft 1c. The PPS mesh cloth 1b wound on the first unwinding shaft 1a passes through the double-narrow coating unit 2, the coagulation bath tank 3 and the drying and conveying unit 4 in turn after being guided by a plurality of guide rollers and then rewound by the first rewinding shaft 1c. The double-narrow coating unit 2 adopts a screw pump (not shown) to mix and uniformly coat the PPS mesh cloth 1b. The degassed slurry is pumped to two symmetrically arranged slit extruders respectively. The two slit extruders evenly cast the slurry onto the PPS mesh 1b passing through the first unwinding and rewinding mechanism 1, and the coating is preformed after the slurry undergoes phase transformation. The coagulation bath 3 is provided with a plurality of pairs of guide rollers 30 for the PPS mesh 1b to reciprocate in and out of the groove. The preformed coating on the PPS mesh 1b is immersed in the coagulation bath 3 for multiple times after the solvent is pre-evaporated, and the coating undergoes non-solvent-induced phase transformation to be coagulated and formed.

[0021] Continue as Figure 1 As shown, the drying and conveying unit 4 comprises an oven 40 and two groups of conveyor belts 41 symmetrically arranged up and down. The two conveyor belts 41 are opposed to each other up and down and driven by two groups of power respectively and supported by the PET carrier film and multiple groups of guide rollers to drive the PPS mesh cloth 1b to pass horizontally through the oven 40. The left and right edges of the composite film of the PPS mesh cloth 1b enter the oven 40 for drying under the pressure of the upper and lower opposing conveyor belts 41. A PET carrier film 5 is also arranged between the inlet and outlet of the drying and conveying unit 4, which enters and exits the oven 40 synchronously with the PPS mesh cloth 1b and assists in supporting the composite film on the PPS mesh cloth 1b to prevent the composite film from stretching and deforming and to prevent the composite film from being damaged by the multiple groups of guide rollers. A second unwinding shaft 6 for unwinding the PET carrier film 5 is provided at the corresponding feeding port of the drying and conveying unit 4, and a second winding shaft 7 for receiving the PET carrier film 5 is provided at the discharging port of the drying and conveying unit 4. The PET carrier film 5 wound on the second unwinding shaft 6 passes through the drying and conveying unit 4 after being guided by multiple guide rollers and is wound and wound by the second winding shaft 7. When entering the oven 40, the composite film and the PET carrier film 5 with lower elongation (PET film is used, and the finished product has the characteristic of strong dimensional stability) are pressed by the conveyor belts 41 on both sides of the oven 40, and the traction force is synchronously pulled by the conveyor belt 41 and the second winding shaft 7 of the PET carrier film 5; after passing through the oven 40, the composite diaphragm and the PET carrier film 5 are wound separately, and the composite diaphragm is wound by the first winding shaft 1c with micro-tension, and the carrier film is wound separately for recycling.

[0022] Continue as Figure 1As shown, between the discharge port of the drying conveyor unit 4 and the first winding shaft 1c of the first winding and unwinding mechanism 1, there are also a plurality of discharge guide rollers 8 for guiding the PPS mesh cloth 1b and the fully cured composite film. Between two of the discharge guide rollers, there is also an arc swing roller 9 for flattening the composite film; on the arc swing roller 9, there is also a tension sensor (not shown in the figure) for real-time feedback of the tension of the PPS mesh cloth 1b and the composite film to maintain the relative stability of the winding tension by controlling the winding speed. The winding speed is controlled by the tension sensor to achieve stable micro-tension winding.

[0023] In this embodiment, a double-layer conveyor belt 41 arranged symmetrically up and down is arranged in the drying channel of the entire oven. When the composite film passes through the middle, the upper and lower double-layer conveyor belts 41 can be closed to form a clamp. The conveyor belts 41 are distributed on both sides of the conveyor belt 41 in the advancing direction, only clamping the edge part of the composite film to prevent the clamping force from damaging the microstructure of the composite film. The PET carrier film 5 is unwound from the second unwinding station, naturally adheres to the composite film when passing through the guide roller, and then enters the conveyor belt 41 and is clamped by the conveyor belt 41 and enters the oven 40 for drying; during the drying process, since the PET carrier film 5 has relatively stronger rigidity and is not easily stretched during the operation of the composite diaphragm, the running tension is basically borne by the PET carrier film 5, and the composite diaphragm is relatively less stressed.

[0024] During the entire conveying process, when the composite film enters the oven 40, the conveyor belts 41 on both sides of the oven 40 press the edges of the composite film and the PET carrier film 5 together, and the composite film is jointly pulled forward by the conveyor belt 41 and the PET carrier film 5. The composite film and the PET carrier film 5 are in a relatively static state during the operation in the oven 40, and the PET carrier film 5 itself is not easily stretched, thus avoiding the stretching of the composite film. At the same time, the PET carrier film 5 protects the composite film from contacting the guide roller of the oven 40 and damaging its microstructure. After exiting the oven 40, the composite film is separated from the PET carrier film 5, and the composite film also adopts micro-tension winding at the winding end to avoid the stretching damage caused by excessive winding tension.

[0025] The above-described embodiments are only the preferred embodiments of the present invention, and do not limit the scope of implementation of the present invention. Any equivalent changes made according to the shape, structure, and principle of the present invention shall be covered within the protection scope of the present invention.

Claims

1. A composite diaphragm production device, characterized in that: It comprises a first unwinding and rewinding mechanism, a double-slit coating unit, a coagulation bath tank and a drying and conveying unit, wherein the first unwinding and rewinding mechanism comprises a first unwinding shaft, a PPS mesh cloth and a first rewinding shaft, wherein the PPS mesh cloth wound on the first unwinding shaft passes through the double-slit coating unit, the coagulation bath tank and the drying and conveying unit in sequence after being guided by a plurality of guide rollers, and is wound up by the first rewinding shaft; The double-slit coating unit uses two slit extruders to evenly cast the slurry onto the PPS mesh unwound by the first unwinding mechanism, and the slurry undergoes phase transformation to form a coating preform; The coagulation bath is provided with a plurality of pairs of guide rollers for the PPS mesh to reciprocate in and out of the bath, and the preformed coating on the PPS mesh is immersed in the coagulation bath for multiple times, and the coating undergoes a non-solvent induced phase transition to be coagulated and formed; The drying and conveying unit comprises an oven and two sets of conveyor belts symmetrically arranged up and down. The left and right edges of the formed coating on the PPS mesh are driven by the upper and lower opposing conveyor belts to enter the oven for drying. A PET carrier film is also provided between the inlet and outlet of the drying conveying unit, which enters and exits the drying oven synchronously with the PPS mesh cloth, and provides auxiliary support for the composite film on the PPS mesh cloth to prevent the composite film from stretching and deforming and to prevent the composite film from being damaged by contact and pressure by multiple groups of guide rollers. Correspondingly, a second unwinding shaft for unwinding the PET carrier film is provided at the feed inlet of the drying conveying unit, and a second winding shaft for receiving the PET carrier film is provided at the discharge outlet of the drying conveying unit. The PET carrier film wound on the second unwinding shaft is guided by multiple guide rollers and then passes through the drying conveying unit and is wound up by the second winding shaft.

2. A composite diaphragm production device according to claim 1, characterized in that: The two conveyor belts are arranged opposite to each other up and down and are driven by two sets of power respectively, and driven by the PPS mesh cloth to pass through the oven horizontally under the support of the PET carrier film and multiple sets of guide rollers.

3. A composite diaphragm production device according to claim 1, characterized in that: The double-narrow coating unit uses a screw pump to pump the mixed and deaerated slurry to two symmetrically arranged narrow slit extrusion heads respectively.

4. A composite diaphragm production device according to claim 1, characterized in that: A plurality of discharge guide rollers for guiding the cured composite film are provided between the discharge port of the drying and conveying unit and the first winding shaft of the first unwinding and winding mechanism, wherein an arc-shaped swing roller for flattening the composite film is provided between two discharge guide rollers.

5. A composite diaphragm production device according to claim 4, characterized in that: The arc-shaped swing roller is also provided with a tension sensor which feeds back the tension of the PPS mesh and the composite film to the first unwinding and rewinding mechanism in real time and maintains a relatively stable rewinding tension by controlling the rewinding speed.

Images