Mesh-based homogeneous membrane production line and method of production

Abstract

The application discloses a homogeneous membrane production line based on a mesh cloth and a production method, which releases the mesh cloth through a releasing device to clamp the mesh cloth and grout and extrude the two sides of the mesh cloth, and then fuses and seals the two sides of the clamped membrane through heat, and then performs secondary polymerization through a high-temperature polymerization box, and finally performs air cooling and stripping and winding. In the application, raw materials are initially polymerized to form slurry, and then the PEEK mesh cloth is clamped through two layers of PET membranes, and the slurry is poured between the two layers of PET membranes, and then the three-layer membrane is extruded through an extruding roller, and after extrusion, the surplus on the two sides of the PET membrane is fused and sealed through heat to make the three-layer membrane into a bag-shaped membrane with two open ends, and then the bag-shaped membrane passes through the high-temperature polymerization box to perform secondary polymerization so that the slurry and the PEEK mesh cloth are polymerized into a membrane, and finally the two layers of PET membranes are stripped through air cooling and stripping to form a finished membrane, and finally the two layers of PET membranes and the finished membrane are wound, and the homogeneous membrane manufactured through the device and the method has the advantage of uniform thickness, and in addition, the PET membrane used in the manufacturing process can also be recycled.

Description

Technical Field

[0001] This invention relates to a homogeneous membrane production line and production method, and more particularly to a homogeneous membrane production line and production method based on a mesh fabric. Background Technology

[0002] Homogeneous membrane electrodialysis can meet the treatment requirements of various feed solutions, featuring low membrane resistivity, high current efficiency, low energy consumption, good selective permeability, and high yield. It is mainly used in material separation, such as the desalting and purification of amino acids, the desalting of pharmaceutical intermediates, and the desalting and concentration of sulfur-containing wastewater from power plants. Using homogeneous membrane electrodialysis, various inorganic salts in materials can be effectively removed, achieving good separation and purification results.

[0003] Patent application CN201410842541.9 discloses a coating apparatus. The coating unit includes a coating roller that coats one side of a lithium-ion secondary battery separator formed of thermoplastic resin, which is transported in a vertical direction. It includes a first guide roller arranged upstream of the coating roller in the film transport direction and on the side of the separator to be coated, and a second guide roller arranged downstream and on the side opposite to the side of the separator to be coated. It also includes a pair of coating auxiliary rollers with diameters smaller than the first and second guide rollers, arranged close to each other on the upstream and downstream sides of the coating roller in the film transport direction. The two coating auxiliary rollers press against the side of the film opposite to the side of the separator to be coated. As a result, a coating apparatus is provided that can produce a thin and uniform coating liquid on the side of the separator to be coated.

[0004] The aforementioned patents and existing technologies generally use coating rollers to form films. During coating, it is difficult to control the amount of coating and the uniformity, resulting in uneven thickness of the finished film and failure to meet quality requirements. The uniformity is even worse when coating mesh. Summary of the Invention

[0005] In the existing technology, when manufacturing homogeneous membranes using the coating method, the coating amount and uniformity cannot be controlled, resulting in uneven thickness of the finished membrane. This invention provides a homogeneous membrane production line and production method based on a mesh fabric.

[0006] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows:

[0007] The homogeneous membrane production line based on PEEK mesh includes, in sequence, a reaction vessel, an unwinding device, a grouting device, a first extrusion roller group and a sealing and welding device, a second extrusion roller group, a high-temperature polymerization box, a cutting device, and a peeling device. The reaction vessel is used for the initial polymerization reaction to generate raw materials. The unwinding device includes three unwinders that respectively unwind PEEK mesh, a first PET film, and a second PET film. After unwinding, the first PET film and the second PET film clamp the PEEK mesh and pass together through the first extrusion roller group. The grouting device has two grouting heads located above the first extrusion roller group. The grouting head injects raw material into the gaps between the first PET film and the PEEK mesh and the second PET film and the PEEK mesh. The widths of the first and second PET films are greater than the width of the PEEK mesh to form sealing edges on both sides of the PEEK mesh. The sealing and welding device is used to seal and weld the sealing edges to form a bag-shaped film with open ends. The second extrusion roller group is used to remove internal air. The high-temperature polymerization box is used to polymerize and form the bag-shaped film. The cutting device is used to cut off the excess material on both sides. The peeling device is used to peel the bag-shaped film to obtain the finished film.

[0008] Preferably, the grouting head has two grouting channels. The first grouting channel is located below the storage chamber of the grouting device and is a spindle-shaped structure with a gradually decreasing diameter. The spindle-shaped structure is wide in the middle and narrow on both sides. The second grouting channel is a spindle-shaped structure with a consistent diameter and its diameter is the same as the bottom diameter of the first grouting channel.

[0009] Preferably, the high-temperature polymerization box includes a box body with openings at both ends, a support roller inside the box body, and a hot air pipe for circulating air supply to provide hot air inside the box body so as to polymerize the slurry at the PEEK mesh.

[0010] Preferably, the sealing and welding devices are located on both sides and are used to heat-seal the sealing edge to form a bag-like structure.

[0011] Preferably, it also includes a winding device, which includes two PET winding machines and one finished film winding machine. The two PET winding machines are used to wind up the upper and lower PET films, and the finished film winding machine is used to wind up the finished film.

[0012] Specifically, the stripping device is an air-cooled stripping device, which has two cold air heads that blow cold air onto the bag-shaped film. The two cold air heads blow cold air onto the upper and lower surfaces of the bag-shaped film respectively.

[0013] The homogeneous membrane production method, using the aforementioned mesh-based homogeneous membrane production apparatus, includes the following steps:

[0014] S1, primary polymerization: producing a slurry with a polymerization rate of 30-70% through polymerization in a reactor;

[0015] S2, Implanting the skeleton: The PEEK mesh, the first PET film and the second PET film are unwound by the unwinding device, and the first PET film and the second PET film clamp the PEEK mesh.

[0016] S3, Grouting: Grout is injected into the gap between the PEEK mesh and the first PET film, as well as the gap between the PEEK mesh and the second PET film, through the grouting device. The grouting device is equipped with two grouting heads, and each grouting head has two grouting channels. The first grouting channel is located below the storage chamber of the grouting device and is a spindle-shaped structure with a gradually decreasing diameter. The spindle-shaped structure is wide in the middle and narrow on both sides. The second grouting channel is a spindle-shaped structure with a consistent diameter and its diameter is the same as the bottom diameter of the first grouting channel. The length of the second grouting channel is the same as the width of the PEEK mesh.

[0017] S4, Extrusion: A first extrusion roller group is set below the grouting position to extrude the three-layer film. The extrusion direction of the first extrusion roller group is horizontal, and the grouting position is located above the first extrusion roller group.

[0018] S5, Sealing: The PET film width is set to be greater than the PEEK mesh width and a sealing edge is formed on both sides of the PEEK mesh. The sealing edge of the two PET films is heat-sealed by a sealing welding device to form a bag-shaped film with openings at both ends.

[0019] S6, Exhaust: A second extrusion roller group is set up to block the air in the bag-shaped film formed by sealing the edge in front of the second extrusion roller group;

[0020] S7, Secondary polymerization: The bag film is subjected to secondary polymerization using a high-temperature polymerization chamber;

[0021] S8, Cutting: Use a cutting device to remove excess material from both sides of the bag-shaped film after secondary polymerization;

[0022] S9, Peeling: A peeling device is used to blow cold air onto the front and back of the bag film to peel off the two layers of PET film to form the finished film.

[0023] S10, Rewinding: The two layers of PET film and the finished film are rewound separately using a rewinding machine.

[0024] Specifically, in step S1, a primary polymerization reaction is generated by sodium styrene sulfonate, sodium methacrylate sulfonate, sodium propylene sulfonate, methyl acrylate and an initiator; or by chloromethylstyrene, methyl acrylate, vinyl ester and an initiator, wherein the initiator is DCP.

[0025] Preferably, in step S2, during the unwinding process of the PEEK mesh, guide wheels are set to guide the PEEK mesh to a vertical position, and the PEEK passes through the first extrusion roller group, the sealing welding device and the extrusion roller in a vertical position.

[0026] Preferably, in step S7, an air inlet pipe and an air outlet pipe are provided on the upper and lower sides of the high-temperature polymerization box. The air outlet pipe and the air inlet pipe are connected to the heating device through a pipe to make the hot air circulate.

[0027] Compared with the prior art, the advantages of the present invention are as follows: In this application, the raw materials are initially polymerized to form a slurry, and then the PEEK mesh is sandwiched between two layers of PET film and the slurry is poured between the two layers. Then, the three layers of film are squeezed by the extrusion roller. After extrusion, the excess parts on both sides of the PET film are heat-fused to form a bag-shaped film with open ends. Then, the bag-shaped film is passed through a high-temperature polymerization box for secondary polymerization to polymerize the slurry and the PEEK mesh into a film. Finally, the two layers of PET film are peeled off by air cooling to form the finished film. At the same time, the two layers of PET film and the finished film are wound up. Attached Figure Description

[0028] The present invention will be further described in detail below with reference to the accompanying drawings and preferred embodiments. However, those skilled in the art will understand that these drawings are drawn only for the purpose of explaining the preferred embodiments and therefore should not be construed as limiting the scope of the invention. Furthermore, unless specifically indicated, the drawings are only schematic representations of the composition or structure of the described objects and may contain exaggerated depictions, and the drawings are not necessarily drawn to scale.

[0029] Figure 1 This is a flowchart of the present invention;

[0030] Figure 2 This is a schematic diagram of the process steps in Embodiment 2 of the present invention.

[0031] Figure 3 This is a cross-sectional view of the second grouting channel in Embodiment 1 of the present invention.

[0032] In the diagram: 10. Winding device; 201. First PET film; 202. Second PET film; 30. PEEK mesh; 401. Guide roller; 402. First extrusion roller group; 403. Second extrusion roller group; 404. Spacing roller; 405. Support roller; 406. Direction roller; 407. Cutting device; 501. Grouting head; 5011. Second grouting channel; 60. Sealing and welding device; 70. Peeling device; 80. Winding device; 90. High-temperature polymerization box. Detailed Implementation

[0033] Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Those skilled in the art will appreciate that these descriptions are merely descriptive and exemplary and should not be construed as limiting the scope of the invention.

[0034] Example 1

[0035] The homogeneous membrane production line based on PEEK mesh includes, in sequence, a reaction vessel, an unwinding device, a grouting device, a first extrusion roller group 402 and a sealing and welding device 60, a second extrusion roller group 403, a high-temperature polymerization box 90, a cutting device 407 and a peeling device 70. The reaction vessel is used for the initial polymerization reaction to generate raw materials. The unwinding device includes three unwinders that respectively unwind PEEK mesh 30, a first PET film 201 and a second PET film 202. After unwinding, the first PET film 201 and the second PET film 202 clamp the PEEK mesh 30 and pass it together through the first extrusion roller group 402. The grouting device has two grouting heads 50 located above the first extrusion roller group 402. 1. The grouting head 501 injects raw materials into the gap between the first PET film 201 and the PEEK mesh 30 and the gap between the second PET film 202 and the PEEK mesh 30. The width of the first PET film 201 and the second PET film 202 is greater than the width of the PEEK mesh 30 so as to form a sealing edge on both sides of the PEEK mesh 30. The sealing and welding device 60 is used to seal and weld the sealing edge to form a bag-shaped film with open ends. The second extrusion roller group 403 is used to remove the internal air. The high-temperature polymerization box 90 is used to polymerize to form a bag-shaped film. The cutting device 407 is used to cut off the excess material on both sides. The peeling device 70 is used to peel the bag-shaped film to obtain the finished film.

[0036] Preferably, the grouting head 501 has two grouting channels. The first grouting channel is located below the storage chamber of the grouting device and is a spindle-shaped structure with a gradually decreasing diameter. The spindle-shaped structure is wider in the middle and narrower on both sides. The second grouting channel 5011 is a spindle-shaped structure with the same diameter as the bottom diameter of the first grouting channel. The smaller diameter of the first grouting channel helps to increase the grouting pressure and ensure the grouting volume. The spindle-shaped structure, with its wider middle and narrower sides, allows for slightly more grout in the middle than on the sides during grouting. After passing through the extrusion roller, the grout inside moves to the sides and top for even distribution. This structure provides a certain margin for the injected grout, avoiding the problem of insufficient grout in some areas leading to a decrease in overall thickness.

[0037] Preferably, the high-temperature polymerization box 90 includes a box body with openings at both ends, a support roller 405 inside the box body, and a hot air pipe for circulating air supply to provide hot air inside the box body so as to polymerize the slurry at the PEEK mesh 30.

[0038] Preferably, the sealing and welding device 60 is located on both sides and is used to heat-seal the sealing edge to form a bag-like structure.

[0039] Preferably, it also includes a winding device 8010, which includes two PET winding machines and one finished film winding machine. The two PET winding machines are used to wind up the upper and lower PET films, and the finished film winding machine is used to wind up the finished film.

[0040] Specifically, the peeling device 70 is an air-cooled peeling device 70, which has two cold air heads that blow cold air onto the bag-shaped film. The two cold air heads blow cold air onto the upper and lower surfaces of the bag-shaped film respectively.

[0041] In addition, a guide wheel 401 is provided above the first extrusion roller group 402. The PEEK mesh 30 passes over the guide wheel 401 and is guided to a vertical direction. When the direction is vertical, the PEEK mesh 30 passes through the middle of the gap in the first extrusion roller group 402. Several sets of spacing rollers 404 are provided between the second extrusion roller group 403 and the high-temperature polymerization box 90. The spacing rollers 404 are used to control the thickness of the bag film, which is in the range of 0.1-0.2mm. During the cutting stage, the bag film is supported by multiple sets of support rollers 405. The cutting is carried out by rollers with cutters. During the winding stage, multiple turning rollers 406 are used to turn the film to facilitate winding.

[0042] It should be noted that the second extrusion roller group 403 includes two extrusion rollers, and the direction of the bag-shaped film passing through the second extrusion roller group 403 changes from vertical to horizontal.

[0043] Example 2

[0044] The homogeneous membrane production method, using the mesh-based homogeneous membrane production apparatus described in Example 1, includes the following steps:

[0045] S1, primary polymerization: producing a slurry with a polymerization rate of 30-70% through polymerization in a reactor;

[0046] S2, implantation skeleton: The PEEK mesh 30, the first PET film 201 and the second PET film 202 are unwound by the unwinding device, and the first PET film 201 and the second PET film 202 clamp the PEEK mesh 30.

[0047] S3, Grouting: Grout is injected into the gap between the PEEK mesh 30 and the first PET film 201 and the gap between the PEEK mesh 30 and the second PET film 202 through the grouting device. The grouting device is equipped with two grouting heads 501 and each grouting head 501 has two grouting channels. The first grouting channel is located below the storage chamber of the grouting device and is a spindle-shaped structure with a gradually decreasing diameter. The spindle-shaped structure is wide in the middle and narrow on both sides. The second grouting channel 5011 is a spindle-shaped structure with the same diameter and its diameter is the same as the bottom diameter of the first grouting channel. The length of the second grouting channel 5011 is the same as the width of the PEEK mesh 30.

[0048] S4, Extrusion: A first extrusion roller group 402 is set below the grouting position to extrude the three-layer film. The extrusion direction of the first extrusion roller group 402 is horizontal extrusion, and the grouting position is located above the first extrusion roller group 402.

[0049] S5, Sealing: The PET film width is set to be greater than the PEEK mesh 30 width and a sealing part is formed outside the two sides of the PEEK mesh 30. The sealing parts on both sides of the two PET films are heat-sealed by a sealing welding device to form a bag-shaped film with openings at both ends.

[0050] S6, Exhausting air: The second extrusion roller group 403 is set to block the air in the bag-shaped film formed by sealing the edge in front of the second extrusion roller group 403.

[0051] S7, Secondary polymerization: The bag film is subjected to secondary polymerization in a high-temperature polymerization chamber at 90°C.

[0052] S8, Cutting: The excess material on both sides of the bag-shaped film after secondary polymerization is removed using the cutting device 407;

[0053] S9, Peeling: Using a peeling device 70, cold air is blown on both sides of the bag film to peel off the two layers of PET film to form the finished film;

[0054] S10, Rewinding: The two layers of PET film and the finished film are rewound separately using a rewinding machine.

[0055] Specifically, in step S1, a primary polymerization reaction is generated by sodium styrene sulfonate, sodium methacrylate sulfonate, sodium propylene sulfonate, methyl acrylate and an initiator, and the final product under this raw material is a cation-coated film; or a primary polymerization reaction is generated by chloromethylstyrene, methyl acrylate, vinyl ester and an initiator, and the final product under this raw material is a cation-coated film; wherein the initiator is DCP.

[0056] Preferably, in step S2, during the unwinding process of the PEEK mesh 30, a guide wheel 401 is set to guide the PEEK mesh 30 to a vertical position, and the PEEK passes through the first extrusion roller group 402, the sealing welding device 60 and the extrusion rollers in a vertical position.

[0057] Preferably, in step S7, an air inlet pipe and an air outlet pipe are provided on the upper and lower sides of the high-temperature polymerization box 90. The air outlet pipe and the air inlet pipe are connected to the heating device through a pipe so that the hot air can circulate.

[0058] The foregoing has described the homogeneous membrane production line and production method based on mesh fabric provided by this invention. Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the embodiments above are merely for the purpose of helping to understand this invention and its core ideas. It should be noted that those skilled in the art can make various improvements and modifications to this invention without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this invention.

Claims

1. A homogeneous membrane production line based on a mesh fabric, characterized in that: The system includes, in sequence, a reaction vessel, an unwinding device, a grouting device, a first extrusion roller group and a sealing and welding device, a second extrusion roller group, a high-temperature polymerization box, a cutting device, and a peeling device. The reaction vessel is used for the initial polymerization reaction to generate raw materials. The unwinding device includes three unwinders that respectively unwind PEEK mesh, a first PET film, and a second PET film. After unwinding, the first PET film and the second PET film clamp the PEEK mesh and pass together through the first extrusion roller group. The grouting device has two grouting heads located above the first extrusion roller group, and the grouting heads inject raw materials into the gaps between the first PET film and the PEEK mesh, and the gaps between the second PET film and the PEEK mesh. The grouting head has two grouting channels. The first grouting channel is located below the material storage chamber of the grouting device and is a spindle-shaped structure with a gradually decreasing diameter. The middle of the spindle-shaped structure is wide. The first PET film and the second PET film are wider than the PEEK mesh to form a sealing edge outside the two edges of the PEEK mesh. The sealing and welding device is used to seal and weld the sealing edge to form a bag-shaped film with open ends. The second extrusion roller is used to remove the air inside. The high-temperature polymerization box includes a box body with open ends. The box body is equipped with a support roller. The box body is equipped with a circulating hot air pipe to provide hot air to the box body so that the slurry at the PEEK mesh is polymerized. The cutting device is used to cut off the excess material on both sides. The peeling device is an air-cooled peeling device, which has two cold air heads that blow cold air to the bag-shaped film. The two cold air heads blow cold air to the upper and lower surfaces of the bag-shaped film to peel the bag-shaped film to obtain the finished film.

2. The homogeneous membrane production line based on mesh fabric according to claim 1, characterized in that, The sealing and welding devices are located on both sides and are used to heat-seal the edge to form a bag-like structure.

3. The homogeneous membrane production line based on mesh fabric according to claim 1, characterized in that, It also includes a winding device, which consists of two PET winding machines and one finished film winding machine. The two PET winding machines are used to wind up the upper and lower PET films, and the finished film winding machine is used to wind up the finished film.

4. A method for producing a homogeneous membrane, comprising using the homogeneous membrane production line based on a mesh fabric as described in any one of claims 1-3, characterized in that, Includes the following steps: S1, primary polymerization: producing a slurry with a polymerization rate of 30-70% through polymerization in a reactor; S2, Implanting the skeleton: The PEEK mesh, the first PET film and the second PET film are unwound by the unwinding device, and the first PET film and the second PET film clamp the PEEK mesh. S3, Grouting: Grout is injected into the gap between the PEEK mesh and the first PET film, as well as the gap between the PEEK mesh and the second PET film, through the grouting device. The grouting device is equipped with two grouting heads, and each grouting head has two grouting channels. The first grouting channel is located below the storage chamber of the grouting device and is a spindle-shaped structure with a gradually decreasing diameter. The spindle-shaped structure is wide in the middle and narrow on both sides. The second grouting channel is a spindle-shaped structure with a consistent diameter and its diameter is the same as the bottom diameter of the first grouting channel. The length of the second grouting channel is the same as the width of the PEEK mesh. S4, Extrusion: A first extrusion roller group is set below the grouting position to extrude the three-layer film. The extrusion direction of the first extrusion roller group is horizontal, and the grouting position is located above the first extrusion roller group. S5, Sealing: The PET film width is set to be greater than the PEEK mesh width and a sealing part is formed outside the two sides of the PEEK mesh. The sealing parts on both sides of the two PET films are heat-sealed by a sealing welding device to form a bag-shaped film with openings at both ends. S6, Exhaust: A second extrusion roller group is set up to block the air in the bag-shaped film formed by sealing the edge in front of the second extrusion roller group; S7, Secondary polymerization: The bag film is subjected to secondary polymerization using a high-temperature polymerization box. The high-temperature polymerization box includes a box body with openings at both ends, a support roller inside the box body, and a circulating hot air pipe on the box body to provide hot air to the box body so that the slurry at the PEEK mesh is polymerized. S8, Cutting: Use a cutting device to remove excess material from both sides of the bag-shaped film after secondary polymerization; S9, Peeling: A peeling device is used to blow cold air onto the front and back of the bag film to peel off the two layers of PET film to form the finished film. S10, Rewinding: The two layers of PET film and the finished film are rewound separately using a rewinding machine.

5. The homogeneous membrane production method according to claim 4, characterized in that, In step S1, a primary polymerization reaction is generated by sodium styrene sulfonate, sodium methacrylate sulfonate, sodium propylene sulfonate, methyl acrylate and an initiator; or by chloromethylstyrene, methyl acrylate, vinyl ester and an initiator, wherein the initiator is DCP.

6. The homogeneous membrane production method according to claim 4, characterized in that, In step S2, during the unwinding process of the PEEK mesh, guide wheels are set to guide the PEEK mesh to a vertical position. The PEEK passes through the first extrusion roller group, the sealing and welding device, and the extrusion rollers in a vertical position.

7. The homogeneous membrane production method according to claim 4, characterized in that, In step S7, an air inlet pipe and an air outlet pipe are installed on the upper and lower sides of the high-temperature polymerization box. The air outlet pipe and the air inlet pipe are connected to the heating device through a pipe to make the hot air circulate.

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