Polyethylene water treatment membrane with hydrophilic coating and preparation equipment and method

Abstract

The present invention relates to the technical field of water treatment membrane production, specifically to a polyethylene water treatment membrane with a hydrophilic coating, and a preparation device and method, including a polyethylene water treatment membrane with a hydrophilic coating, wherein the polyethylene water treatment membrane includes a polyethylene membrane and a coating; the coating is a hydrophilic coating applied to the surface of the polyethylene membrane by a UV curing method. The scraper adjustment assembly and the scraper are flexibly supported by a movable base, which facilitates adjustment of the scraper position to ensure uniform coating of the coating. The illumination unit adopts a fine-tunable design to change the illumination range to ensure uniform UV illumination, so that the acrylate groups are polymerized and cross-linked to form a stable solidified structure, and the coating is durable. The heat generated by the illumination is concentrated by the exhaust gas treatment unit, and the filtered gas is recycled, which can satisfy the needs of blowing the purified gas toward the composition in the direction of the coating to complete uniform coating, and simultaneously perform curing in the rear end direction, saving time.

Description

Technical Field

[0001] The invention relates to the technical field of water treatment membrane production, in particular to a polyethylene water treatment membrane with a hydrophilic coating and a preparation device and method. Background Art

[0002] Membrane water treatment technology, a leading global water treatment technology, has been widely applied in various fields, including industrial wastewater treatment and reuse, deep domestic wastewater treatment, pure and ultrapure water production, and seawater desalination. Its core lies in the water treatment membrane, a medium capable of molecular-level separation and filtration. When wastewater contacts the membrane, molecules selectively pass through it based on differences in pressure, solution concentration, charge, or temperature across the membrane, thereby separating and purifying the different components in the wastewater. There are many types of water treatment membranes, which can be divided into inorganic membranes, organic membranes, and organic-inorganic composite membranes based on their materials. Inorganic membranes are made of inorganic materials such as metals, metal oxides, and ceramics. While they excel in treating high-concentration industrial wastewater, they suffer from disadvantages such as high cost, alkali resistance, low elasticity, and difficulty in processing and preparation. Organic membranes, especially those based on polyolefins and polyethylene, while widely used, generally suffer from poor affinity with water and limited service life. Therefore, the development of polyethylene water treatment membranes with hydrophilic coatings and equipment for their preparation is particularly important.

[0003] In the prior art, a method for preparing a tubular membrane for water treatment, such as that disclosed in publication number CN104774026B, comprises using alumina powder as an aggregate, adding silicon carbide whiskers, a pore-forming agent, a sintering aid, and water to form a slurry, and then grinding the slurry. The slurry is then aged and dried, followed by adding a plasticizer and water for further grinding, tube mold molding, drying, sintering, and cleaning to obtain a tubular support. The ground aluminum isopropoxide is added to hot deionized water and subjected to magnetic stirring. Nitric acid, a dispersant, and a defoamer are then added in batches and stirred to obtain a sol. The sol is then aged. The outer surface of the support is then sealed, coated, gelled, dried, and sintered. By controlling the hydrolysis temperature and the amount of deionized water used, a relatively stable sol can be prepared. At the same time, adding an appropriate dispersant and defoamer to the sol helps improve the wettability of the sol with the support surface, improving the film quality and avoiding cracks.

[0004] However, in actual use, the existing technology adopts a combination of pasting and dipping to prepare the treatment membrane. However, the surface of the water treatment membrane lacks a coating, resulting in poor affinity with water and limited service life.

[0005] Therefore, the present invention proposes a polyethylene water treatment membrane with a hydrophilic coating and a preparation device and method to solve the problem of poor affinity between existing water treatment membranes and water, and has a long-lasting hydrophilic effect. The polyvinyl pyrrolidone and polyether diol diacrylate in the coating composition are the main components that provide hydrophilic lubrication. The acrylate groups in the components can be polymerized and cross-linked under the action of UV light, thereby forming a stable cured structure, making the coating durable. Summary of the Invention

[0006] In view of the shortcomings of the existing technology, the purpose of the present invention is to provide a polyethylene water treatment membrane with a hydrophilic coating and a preparation device and method, which have the advantage of a long-lasting hydrophilic effect.

[0007] To achieve the above objectives, the present invention provides the following technical solutions: In a first aspect, a polyethylene water treatment membrane with a hydrophilic coating comprises a polyethylene membrane and a coating, wherein the polyethylene membrane is an industrially produced wet-process polyethylene diaphragm having a pore size of 0.01 to 0.4 μm; and the coating is a hydrophilic coating applied to the surface of the polyethylene membrane by a UV curing method.

[0008] The coating contains the following ingredients and their weight proportions:

[0009] Polyvinyl pyrrolidone polymer: any value between 10 and 50 parts by mass;

[0010] Polyether diol diacrylate: any value between 10 and 30 parts by mass;

[0011] Small molecule polyacrylate: any value between 5 and 15 parts by mass;

[0012] Photoinitiator: any value between 0.5 and 3 parts by mass;

[0013] The total mass concentration of the active ingredient is any value between 5% and 50%, with the remainder being solvent;

[0014] The preparation method of the polyethylene water treatment membrane comprises the following steps:

[0015] Step 1: Substrate preparation: Select appropriate polyethylene material as the substrate and pre-treat the selected polyethylene substrate, including cleaning and drying steps to ensure the cleanliness and flatness of the substrate surface;

[0016] Step 2: Coating preparation: dissolving a hydrophilic polymer in a suitable solvent in a certain proportion to form a uniform coating solution, mixing the coating solution with water in a certain proportion at room temperature, and stirring for 3 to 6 hours to obtain a coating composition;

[0017] Step 3. Coating: The prepared coating composition is evenly coated on the surface of the pretreated polyethylene substrate by a roll coating method using a film coater;

[0018] Step 4. Curing treatment: The coated polyethylene film is dried at a temperature of 50 - 80 °C to dry the solvent; then the dried polyethylene film is irradiated by a UV ultraviolet lamp for a certain period of time, so that the acrylate groups in the coating undergo a polymerization crosslinking reaction under the action of UV light to form a stable cured structure.

[0019] In the second aspect, a preparation device for a polyethylene water treatment membrane with a hydrophilic coating, the film coater includes a gravure roll coater body, a moving base is movably installed on the upper surface of the gravure roll coater body, the moving base has a "冂"-shaped frame structure, a scraper adjusting member is fixedly installed at the upper end of the moving base, an output end of the scraper adjusting member is connected to a scraper, the scraper is movably installed inside the moving base, placing grooves and limiting grooves are respectively formed on both sides of the moving base, a roller bar is movably installed on the inner surface of the placing groove, a slider is movably connected to the inner surface of the limiting groove, and both ends of the scraper are fixedly connected to the inner side of the slider. A heat collecting cover is arranged on the back side of the scraper, a lighting unit is arranged on the inner side of the lower end of the heat collecting cover, a purification cylinder is fixedly installed at the upper end of the heat collecting cover, and an exhaust gas treatment unit is arranged inside the purification cylinder. The lighting unit includes a UV lighting lamp group and movable folding plates, and the exhaust gas treatment unit includes a columnar filter cartridge, a filtering component, a first outlet pipe and a second outlet pipe.

[0020] Preferably, both ends of the UV lighting lamp group are detachably connected to the inner wall of the lower side of the heat collecting cover, two groups of movable folding plates are arranged and distributed oppositely, a fine adjustment component is arranged on the outer sides of the two groups of movable folding plates, the fine adjustment component includes a protective cover and a turning handle, the protective cover is fixedly installed on the outer side of the heat collecting cover, the inner wall of the center of the protective cover is rotatably connected to the outer surface of the turning handle, a gear is fixedly connected to the inner end of the turning handle, and two groups of toothed plates are meshingly rotated on the outer surfaces of both sides of the gear.

[0021] Preferably, a fixed connecting block is fixedly installed on one side surface of the two groups of toothed plates, the outer surface of the fixed connecting block is slidably connected to the inner wall of a preset sliding groove on the inner wall of the heat collecting cover, and the outer surface of the fixed connecting block is fixedly connected to the outer surface of the movable folding plate.

[0022] Preferably, the lower end of the purification cylinder is fixedly connected to a flange connecting plate by bolts, the columnar filter cartridge is detachably installed inside the flange connecting plate, a driving fan is arranged inside the columnar filter cartridge, and the driving fan is composed of a servo motor and fan blades.

[0023] Preferably, two groups of filter assemblies are provided, and the two groups of filter assemblies are installed inside the purification cylinder. The filter assembly includes a cross plate and an annular seat. The outer surface of the annular seat is fixedly connected to the inner wall of the purification cylinder, and the cross plate is a "cross" shaped plate structure fixedly installed on the inner side of the annular seat.

[0024] Preferably, a fan-shaped groove is provided on the annular inner wall of the annular seat, and a filter plate is movably installed on the inner surface of the fan-shaped groove. The filter plate is a four-divided fan-shaped plate structure, and a sealing ring is sleeved on the outer surface of the filter plate. The outer surface of the sealing ring is movably engaged with the inner wall of the purification cylinder.

[0025] Preferably, the central inner wall of the cross plate is connected to the outer surface of the outlet pipe 2, the upper end of the outlet pipe 2 is connected to the inner wall of the outlet pipe 1, a switch valve is provided on the upper surface of the outlet pipe 2, and a cross hollow tube is connected to the inner wall of the lower end of the outlet pipe 2.

[0026] Preferably, the input end of the outlet pipe one is through-connected with the inner wall of the upper end of the purification cylinder, the output end of the outlet pipe one is fixedly connected to a micro fan, the output end of the micro fan is sealed and connected to a heat-resistant hose, the other end of the heat-resistant hose is provided with a rectangular exhaust blowing plate, the rectangular exhaust blowing plate is detachably mounted on the outside of the scraper by bolts, the inner surface of the rectangular exhaust blowing plate is provided with a focusing cavity, a diverter plate is fixedly mounted on the side wall of the focusing cavity, and oblique blowing holes are respectively provided on both sides of the diverter plate.

[0027] In a third aspect, a method for preparing a polyethylene water treatment membrane with a hydrophilic coating comprises the following steps:

[0028] Step 1. Equipment preparation and commissioning: Install all parts of the equipment correctly according to the instructions, check whether all connections are tight, ensure stable operation of the equipment, then start the equipment, adjust the scraper adjustment parts, ensure that the gap between the scraper and the polyethylene water treatment membrane is uniform, and at the same time, adjust the lighting unit to ensure that the UV light evenly covers the entire membrane surface;

[0029] Step 2: Preparation of polyethylene water treatment membrane: Place the polyethylene water treatment membrane on the gravure roller coating machine, start the equipment, and evenly apply the hydrophilic coating on the membrane surface with a scraper;

[0030] Step 3: Light curing: After coating is completed, start the light unit and irradiate the film surface with UV light to quickly cure the coating;

[0031] Step 4: Waste gas treatment and emission: The waste gas generated during the coating and lighting process is collected by a heat collecting hood and introduced into the waste gas treatment unit. The waste gas undergoes multi-level filtration to remove harmful substances and ensure that the exhaust gas meets environmental protection standards;

[0032] Step 5. Equipment cleaning and maintenance: After production is completed, turn off the power of the equipment and clean all parts of the equipment.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] The present invention proposes a polyethylene water treatment membrane with a hydrophilic coating and a preparation device and method. The scraper adjustment assembly and the scraper are flexibly supported by a movable base, which facilitates adjustment of the scraper position and ensures uniform coating of the coating. The illumination unit adopts a fine-tunable design to change the illumination range, ensure uniform UV illumination, polymerize and cross-link the acrylate groups, form a stable solidified structure, and make the coating durable. The heat generated by the illumination is concentrated by the exhaust gas treatment unit, and the gas is recycled after filtration, which can meet the needs of blowing the purified gas toward the composition in the direction of the coating to complete uniform coating, and simultaneously perform curing in the rear end direction, saving time and solving the problem of poor affinity between the existing water treatment membrane and water. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0036] Figure 2 It is a schematic diagram of the front three-dimensional structure of the mobile base of the present invention;

[0037] Figure 3 It is a schematic diagram of the three-dimensional structure of the back side of the mobile base of the present invention;

[0038] Figure 4 This is a schematic diagram of the connection structure between the movable base and the scraper of the present invention;

[0039] Figure 5 It is a schematic diagram of the partial cross-section structure of the heat collecting cover of the present invention;

[0040] Figure 6 For the present invention Figure 5 A schematic diagram of the enlarged structure at point A;

[0041] Figure 7 Schematic diagram of the split cross-section structure of the exhaust gas treatment unit of the present invention;

[0042] Figure 8 Schematic diagram of the three-dimensional structure of the auxiliary backflush assembly of the present invention;

[0043] Figure 9 This is a schematic diagram of the disassembled structure of the filter assembly of the present invention;

[0044] Figure 10 is a schematic side cross-sectional structural diagram of the illumination unit of the present invention;

[0045] Figure 11This is a schematic diagram of the connection structure between the heat-resistant hose and the rectangular exhaust blowing plate of the present invention;

[0046] Figure 12 For the present invention Figure 11 A schematic diagram of the enlarged structure at point B;

[0047] Figure 13 Flowchart of the present invention.

[0048] Figure: 1. Gravure roller coater body; 2. Mobile base; 20. Placement slot; 21. Roller; 200. Limiting slot; 22. Scraper; 3. Heat collecting cover; 4. Purification cylinder; 31. UV light assembly; 32. Movable folding plate; 320. Reinforced bevel strip; 321. Protective cover; 322. Turning handle; 323. Gear; 324. Tooth plate; 325. Fixed connecting block; 41. Flange connection plate; 42. Column filter cartridge; 421. Drive fan; 43. Filter assembly; 431. Cross plate; 43 2. Annular seat; 4320. Fan-shaped groove; 433. Filter plate; 4331. Sealing ring; 44. Export pipe 1; 441. Micro fan; 442. Heat-resistant hose; 443. Rectangular exhaust blowing plate; 4430. Concentrating cavity; 4431. Diverter plate; 4432. Oblique blowing hole; 45. Export pipe 2; 451. Cross hollow tube; 452. Micro air pump; 453. Output pipe; 454. Rotary joint; 455. Hollow storage plate; 4551. Air guide elbow; 4552. Branch pipe. DETAILED DESCRIPTION

[0049] In order to clearly and completely describe the objectives and technical solutions of the present invention and make its advantages more clearly understood, the embodiments of the present invention are further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only part of the embodiments of the present invention, not all of them, and are only used to explain the embodiments of the present invention, not to limit the embodiments of the present invention. All other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0050] For example 1, please refer to Figure 1-13 The present invention provides a technical solution: a polyethylene water treatment membrane with a hydrophilic coating, the polyethylene water treatment membrane comprising a polyethylene membrane and a coating, the polyethylene membrane being an industrially produced wet-process polyethylene diaphragm having a pore size of 0.01 to 0.4 μm; the coating being a hydrophilic coating applied to the surface of the polyethylene membrane by a UV curing method;

[0051] The coating contains the following ingredients and their weight proportions:

[0052] Polyvinyl pyrrolidone polymer: any value between 10 and 50 parts by mass;

[0053] Polyether diol diacrylate: any value between 10 and 30 parts by mass;

[0054] Small molecule polyacrylate: any value between 5 and 15 parts by mass;

[0055] Photoinitiator: any value between 0.5 and 3 parts by mass;

[0056] The total mass concentration of the active ingredient is any value between 5% and 50%, with the remainder being solvent;

[0057] The preparation method of the polyethylene water treatment membrane comprises the following steps:

[0058] Step 1: Substrate preparation: Select an appropriate polyethylene material as the substrate and pre-treat the selected polyethylene substrate, including cleaning and drying steps to ensure the cleanliness and flatness of the substrate surface. Cleaning can remove impurities such as stains and grease on the surface of the polyethylene substrate, while drying can remove moisture from the substrate surface, providing good substrate surface conditions for subsequent coating preparation and curing processes.

[0059] Step 2: Coating Preparation: Dissolve the hydrophilic polymer in an appropriate solvent in proportion to form a uniform coating solution. Mix the coating solution with water in a certain proportion at room temperature and stir for 3 to 6 hours to prepare a coating composition. This step ensures the uniformity and stability of the coating solution, providing high-quality coating material for the subsequent coating process. At the same time, stirring can further promote the full mixing of the components and improve the overall performance of the coating.

[0060] Step 3: Coating: The prepared coating composition is evenly coated on the surface of the pretreated polyethylene substrate using a coating machine by roller coating. Roller coating has the advantages of uniform coating, fast speed, and high efficiency. It can ensure that the coating forms a continuous and uniform film on the surface of the polyethylene substrate, which not only improves the coverage and adhesion of the coating, but also enables the coating to form a more stable and durable structure after curing.

[0061] Step 4: Curing treatment: The coated polyethylene film is placed at a temperature of 50-80°C and dried to dry the solvent; the dried polyethylene film is then irradiated with a UV lamp for a certain period of time, specifically a 15s photocuring reaction in a UV curing device, so that the acrylate groups in the coating undergo polymerization and cross-linking reaction under the action of UV light to form a stable cured structure; UV curing can cause the coating to undergo polymerization and cross-linking reaction in a short time to form a stable cured structure, which not only improves the hardness and wear resistance of the coating, but also enables the coating to maintain good stability and durability during long-term use.

[0062] Example 2. On the basis of Example 1, during the implementation process of coating preparation, 30 parts by mass of polyvinylpyrrolidone, 20 parts by mass of polyether diol diacrylate, 10 parts by mass of (propylene oxide type) glycerol triacrylate, 1 part by mass of photoinitiator, and 2-hydroxy-2-methyl-1-phenylpropanone are dissolved in water and stirred and mixed evenly to obtain a polyethylene film coating composition 1 for water treatment according to the present invention;

[0063] 35 parts by mass of polyvinylpyrrolidone, 20 parts by mass of polyether diol diacrylate, 10 parts by mass of (propylene oxide type) glycerol triacrylate, 1.2 parts by mass of photoinitiator, and 2-hydroxy-2-methyl-1-phenylpropanone are dissolved in water and stirred and mixed evenly to obtain a polyethylene film coating composition 2 for water treatment according to the present invention;

[0064] 10 parts by mass of polyvinylpyrrolidone, 20 parts by mass of polyether diol diacrylate, 5 parts by mass of (propylene oxide type) glycerol triacrylate, 0.5 parts by mass of photoinitiator, and 2-hydroxy-2-methyl-1-phenylpropanone are dissolved in water and stirred and mixed evenly to obtain a polyethylene film coating composition 3 for water treatment; the coating composition is coated on the surface of a polyethylene diaphragm substrate by using an intaglio roll coater body, dried at a temperature of 80 °C, and subjected to a 15 s photocuring reaction through a UV curing device to obtain a polyethylene film for water treatment;

[0065] Polyvinylpyrrolidone and polyether diol diacrylate in the coating composition are the main components providing hydrophilic and lubricating effects.

[0066] Example 3. Referring to the appendix Figure 1-13 , on the basis of Example 2, the present invention proposes a preparation device for a polyethylene water treatment membrane with a hydrophilic coating. The coater includes an intaglio roll coater body 1. A moving base 2 is movably installed on the upper surface of the intaglio roll coater body 1. The moving base 2 has a "冂"-shaped frame structure. A blade adjusting member is fixedly installed at the upper end of the moving base 2. The output end of the blade adjusting member is connected to a blade 22. The blade 22 is movably installed inside the moving base 2. Placement grooves 20 and limiting grooves 2******** are respectively formed on both sides of the moving base 2. A roller rod 21 is movably installed on the inner surface of the placement groove 20. The inner surface of the limiting groove 200 is movably connected to a slider. The inner sides of the slider are fixedly connected to both ends of the blade 22. A heat gathering cover 3 is arranged on the back side of the blade 22. A lighting unit is arranged on the inner side of the lower end of the heat gathering cover 3. A purification cylinder 4 is fixedly installed at the upper end of the heat gathering cover 3. An exhaust gas treatment unit is arranged inside the purification cylinder 4. The lighting unit includes a UV lighting lamp group 31 and a movable folding plate 32. The exhaust gas treatment unit includes a columnar filter cartridge 42, a filtering component 43, a lead-out pipe 44, and a lead-out pipe 45.

[0067] Example 4. Referring to the appendix Figure 1-13 On the basis of Example 3, in order to achieve efficient curing between the composition coating and the polyethylene substrate: the two ends of the UV light lamp group 31 are detachably connected to the lower inner wall of the heat collecting cover 3, and two groups of movable flaps 32 are provided and relatively distributed. The outer sides of the two groups of movable flaps 32 are provided with fine-tuning components, and the fine-tuning components include a protective cover 321 and a rotating handle 322. The protective cover 321 is fixedly installed on the outer side of the heat collecting cover 3, and the central inner wall of the protective cover 321 is rotatably connected to the outer surface of the rotating handle 322. One end of the inner side of the rotating handle 322 is fixedly connected to a gear 323, and the outer surfaces of both sides of the gear 323 are The tooth plates 324 are meshed and rotated, and two groups of tooth plates 324 are provided; a fixed connecting block 325 is fixedly installed on one side surface of the two groups of tooth plates 324, and the outer surface of the fixed connecting block 325 is slidably connected to the inner wall of the preset slide groove on the inner wall of the heat collecting cover 3, and the other side surface of the fixed connecting block 325 is fixedly connected to the outer surface of the movable folding plate 32; the movable folding plate 32 is specifically composed of a flat plate and an inclined plate, the flat plate and the inclined plate are rotatably connected, the outer side surface of the flat plate is fixedly connected to the surface of the fixed connecting block 325, and the two groups of relatively distributed inclined plates are movably connected, forming an angle between the two groups of relatively distributed inclined plates;

[0068] The back side of the scraper 22 is connected to a heat collecting cover 3 for concentrating the heat generated by the UV light lamp group 31 and the surface of the gravure roller coating machine body 1 during light curing. Figure 5 and Figure 10 As shown, the two sets of movable folding plates 32 are relatively distributed. When the inclination angle of the two sets of inclined panels needs to be adjusted, the operator manually rotates the handle 322 to rotate the gear 323. When the gear 323 rotates, the tooth plates 324 on both sides are adapted to mesh with the external teeth of the gear 323. In this way, the tooth plates 324 are relatively movable, and the flat plates connected to the tooth plates 324 slide on the inner side of the heat collecting cover 3. When the two sets of fixed connecting blocks 325 are relatively close, the angle formed between the inclined panels becomes smaller. In this way, the two sets of movable folding plates 32 provide a wider range of light shielding for the upper part of the UV light lamp group 31, so that the reflected light is efficiently irradiated to the coating composition and the substrate surface. In this way, by adjusting the state of the two sets of movable folding plates 32, the light curing effect is enhanced, and the acrylate groups in the components can be polymerized and cross-linked under the action of UV light, thereby forming a stable cured structure, making the coating durable.

[0069] Example 5, refer to the attached Figure 1-13 On the basis of the fourth embodiment, in order to enhance the overall structural strength of the movable flap 32: the relative distribution of the two groups of movable flaps 32 forms an angle, and the inner surface of the movable flap 32 is fixedly provided with a reinforcing oblique strip 320. The reinforcing oblique strip 320 has an "H"-shaped block structure. By uniformly distributing the reinforcing oblique strip 320 on the inner inclined surface of the movable flap 32, the strength of the movable flap 32 can be enhanced, thereby preventing the movable flap 32 from being corroded and damaged by continuous heat input;

[0070] By strengthening the "H"-shaped structure of the oblique strips 320, it is possible to disperse and withstand pressure from all sides, especially when facing the continuous hot air input from under the heat collecting cover 3. It can effectively reduce the direct impact of the hot air on the movable folding plate 32, thereby reducing the risk of corrosion and damage. This design not only improves the durability of the structure, but also ensures the stability and reliability of the movable folding plate 32 in long-term use.

[0071] Example 6, refer to the attached Figure 1-13 , on the basis of embodiment 5, in order to realize the recovery of heat generated by light: the lower end of the purification cylinder 4 is fixedly connected with a flange connection plate 41 by bolts, and the columnar filter cartridge 42 is detachably mounted on the inner side of the flange connection plate 41, and a driving fan 421 is provided on the inner side of the columnar filter cartridge 42, and the driving fan 421 is composed of a servo motor and a fan blade; two groups of filter components 43 are provided, and the two groups of filter components 43 are installed inside the purification cylinder 4, and the filter component 43 includes a cross plate 431 and an annular seat 432, the outer surface of the annular seat 432 is fixedly connected to the inner wall of the purification cylinder 4, and the cross plate 431 is a "cross" shaped plate structure fixedly mounted on the inner side of the annular seat 432; the annular inner wall of the annular seat 432 is provided with a fan-shaped groove 4320, and the inner surface of the fan groove 4320 is movably mounted with a filter Plate 433, the filter plate 433 is a four-part fan-shaped plate structure, the outer surface of the filter plate 433 is sleeved with a sealing ring 4331, and the outer surface of the sealing ring 4331 is movably engaged with the inner wall of the purification cylinder 4; the input end of the outlet pipe 44 is connected with the inner wall of the upper end of the purification cylinder 4, the output end of the outlet pipe 44 is fixedly connected with a micro fan 441, and the output end of the micro fan 441 is sealed with a heat-resistant hose 442, and the other end of the heat-resistant hose 442 is provided with a rectangular exhaust blowing plate 443, which is detachably mounted on the outer side of the scraper 22 by bolts, and the inner surface of the rectangular exhaust blowing plate 443 is provided with a central cavity 4430, and a diverter plate 4431 is fixedly mounted on the side wall of the central cavity 4430, and oblique blowing holes 4432 are respectively provided on both sides of the diverter plate 4431;

[0072] When the UV light lamp group 31 continuously applies the coating composition and the polyethylene substrate to the gravure roller coating machine body 1 for illumination, the hot gas generated is absorbed by the micro-blower 441, and the hot gas rises and passes through the driving fan 421 installed on the inner side of the columnar filter cartridge 42. When the servo motor drives the fan blades to rotate continuously, the driving fan 421 rotates, which can speed up the flow rate of the rising hot gas and accelerate the ascent of the lower air flow, so that the exhaust gas can more efficiently enter the interior of the purification cartridge 4 for exhaust gas treatment; the hot gas enters the interior of the purification cartridge 4 through the flange connection plate 41, and the impurities and harmful substances in the hot gas are adsorbed by the annular seat 432. The exhaust gas in the hot gas rises after multiple filtrations and is finally discharged through the outlet pipe 44 It should be noted that when the switch valve on the outlet pipe 2 45 is closed, all the rising purified gas is discharged through the outlet pipe 1 44. At this time, the gas passes through multiple groups of heat-resistant hoses 442 and enters the interior of the rectangular exhaust blowing plate 443. The purified gas is finally distributed through the diverter plate 4431, and the gas in the cavity is sprayed to both sides. In this way, the purified gas can also be used to introduce the direction of the scraper 22. The rectangular exhaust blowing plate 443 is located between the roller 21 and the scraper 22. In this way, the initially rolled and evenly distributed composition can be re-blown away to prevent the coating from accumulating when scraping, further improving the coverage and adhesion of the coating, and also allowing the coating to form a more stable and durable structure after curing.

[0073] Reference Figure 9 As shown, a fan-shaped groove 4320 is provided on the side ring surface of the annular seat 432 for the adapter and clamping of the filter plate 433, which can realize the convenient disassembly of the saturated filter plate 433, has a simple structure and is convenient for maintenance. In addition, it cooperates with the sleeve of the sealing ring 4331 to enhance the sealing between the purification cylinder 4 and avoid gas leakage.

[0074] Example 7, refer to the attached Figure 1-13On the basis of the sixth embodiment, in order to realize the blowing of impurities adhering to the side wall of the purification cylinder 4 and the back-flushing of the filter assembly 43: the central inner wall of the cross plate 431 is connected to the outer surface of the second outlet pipe 45, the upper end of the second outlet pipe 45 is connected to the inner wall of the first outlet pipe 44, the upper surface of the second outlet pipe 45 is provided with a switch valve, and the inner wall of the lower end of the second outlet pipe 45 is connected to the cross hollow pipe 451; the lower end of the second outlet pipe 45 is provided with an auxiliary back-flushing assembly, which includes a micro air pump 452, and the input end of the micro air pump 452 is connected to the inner wall of the first outlet pipe 44. The bottom end of the second outlet pipe 45 is fixedly connected, and the output end of the micro air pump 452 is fixedly connected to the output pipe 453. The lower end of the output pipe 453 is rotatably connected to a rotary joint 454. The central inner surface of the rotary joint 454 is fixedly connected to a hollow storage plate 455. The hollow storage plate 455 has a hollow circular plate structure. The inner wall of the hollow storage plate 455 is connected to an air guide bend 4551. The air guide bend 4551 is provided in six groups and is arranged in an array equidistantly about the central axis of the hollow storage plate 455. The inner wall of the air guide bend 4551 is connected to a branch pipe 4552.

[0075] When the exhaust gas treatment unit is used continuously for a period of time, the filtering effect of the filter assembly 43 itself is reduced. At this time, the switch valve provided on the outlet pipe 2 45 can be opened to open the outlet pipe 2 45 flow channel. Then, most of the purified gas will be discharged from the outlet pipe 1 44, and a small part of the gas will be sucked by the micro-air pump 452. The gas will be discharged through the outlet of the cross hollow tube 451 and the air guide bend 4551. It should be noted that under the distribution of multiple groups of evenly arranged air guide bends 4551 and branch pipes 4552, the gas ejected The gas will give a thrust to the adjacent air guide bend 4551, and under the connection between the rotary joint 454 and the hollow storage plate 455, the hollow storage plate 455 is driven to rotate as a whole through the reverse thrust. The ejected gas can not only blow off the impurities adhering to the side wall of the purification cylinder 4, but also the continuously rotating cross hollow tube 451 and the air guide bend 4551 can also serve as a mixing piece between the two groups of filter components 43, thereby accelerating the contact surface between the rising exhaust gas and the filter plate 433, thereby further accelerating the exhaust gas purification efficiency.

[0076] Example 8, a method for preparing a polyethylene water treatment membrane with a hydrophilic coating, comprising the following steps:

[0077] Step 1: Equipment preparation and commissioning: Install all parts of the equipment correctly according to the instructions, check whether all connections are tight, ensure stable operation of the equipment, then start the equipment, adjust the scraper adjustment parts, ensure that the gap between the scraper 22 and the polyethylene water treatment membrane is uniform, and at the same time, adjust the lighting unit to ensure that the UV light evenly covers the entire membrane surface;

[0078] Step 2: Preparation of polyethylene water treatment membrane: Place the polyethylene water treatment membrane on the gravure roller coating machine body 1, start the equipment, and evenly coat the hydrophilic coating on the membrane surface with the scraper 22;

[0079] Step 3: Light curing: After coating is completed, the light unit is started, and the UV light lamp group 31 irradiates the film surface to quickly cure the coating;

[0080] Step 4: Waste gas treatment and emission: The waste gas generated during the coating and illumination process is collected by the heat collecting cover 3 and introduced into the waste gas treatment unit. The waste gas undergoes multi-level filtration to remove harmful substances and ensure that the exhaust gas meets environmental protection standards;

[0081] Step 5. Equipment cleaning and maintenance: After production is completed, turn off the power of the equipment and clean all parts of the equipment.

[0082] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A device for preparing a polyethylene water treatment membrane with a hydrophilic coating, characterized in that: It includes an intaglio roll coater body (1). A moving base (2) is movably installed on the upper surface of the intaglio roll coater body (1). The moving base (2) has a "冂"-shaped frame structure. A knife-edge adjusting member is fixedly installed at the upper end of the moving base (2). The output end of the knife-edge adjusting member is connected to a knife-edge (22). The knife-edge (22) is movably installed inside the moving base (2). Placement grooves (20) and limiting grooves (200) are respectively formed on both sides of the moving base (2). A roller bar (21) is movably installed on the inner surface of the placement groove (20). A slider is movably connected to the inner surface of the limiting groove (200). The inner sides of the slider are fixedly connected to both ends of the knife-edge (22). A heat-gathering cover (3) is arranged on the back side of the knife-edge (22). A lighting unit is arranged inside the lower end of the heat-gathering cover (3). A purification cylinder (4) is fixedly installed at the upper end of the heat-gathering cover (3). An exhaust gas treatment unit is arranged inside the purification cylinder (4). The lighting unit includes a UV lighting lamp group (31) and movable folding plates (32). The exhaust gas treatment unit includes a columnar filter cartridge (42), a filtering component (43), a first outlet pipe (44) and a second outlet pipe (45); Both ends of the UV lighting lamp group (31) are detachably connected to the inner wall of the lower side of the heat-gathering cover (3). Two groups of the movable folding plates (32) are arranged and distributed oppositely. A fine-tuning component is arranged on the outer sides of the two groups of movable folding plates (32). The fine-tuning component includes a protective cover (321) and a turning handle (322). The protective cover (321) is fixedly installed on the outer side of the heat-gathering cover (3). The inner wall of the center of the protective cover (321) is rotatably connected to the outer surface of the turning handle (322). A gear (323) is fixedly connected to the inner end of the turning handle (322). Two groups of toothed plates (324) are meshed and rotated on the outer surfaces of both sides of the gear (323); Fixed connecting blocks (325) are fixedly installed on one side surface of the two groups of toothed plates (324). The outer surface of the fixed connecting block (325) is slidably connected to the inner wall of a preset sliding groove on the inner wall of the heat-gathering cover (3). The other side surface of the fixed connecting block (325) is fixedly connected to the outer surface of the movable folding plate (32).

2. The equipment for preparing a polyethylene water treatment membrane with a hydrophilic coating according to claim 1, characterized in that: The lower end of the purification cylinder (4) is fixedly connected to a flange connection disk (41) by bolts. The columnar filter cartridge (42) is detachably installed inside the flange connection disk (41). A driving fan (421) is arranged inside the columnar filter cartridge (42). The driving fan (421) is composed of a servo motor and fan blades.

3. The equipment for preparing a polyethylene water treatment membrane with a hydrophilic coating according to claim 2, characterized in that: Two groups of the filtering components (43) are arranged. The two groups of filtering components (43) are installed inside the purification cylinder (4). The filtering component (43) includes a cross plate (431) and an annular seat (432). The outer surface of the annular seat (432) is fixedly connected to the inner wall of the purification cylinder (4). The cross plate (431) is fixedly installed inside the annular seat (432) in a "十"-shaped plate structure.

4. The equipment for preparing a polyethylene water treatment membrane with a hydrophilic coating according to claim 3, characterized in that: The annular inner wall of the annular seat (432) is provided with a fan-shaped groove (4320), and a filter plate (433) is movably mounted on the inner surface of the fan-shaped groove (4320). The filter plate (433) is in the form of a fan-shaped plate with four equal parts. A sealing ring (4331) is sleeved on the outer surface of the filter plate (433), and the outer surface of the sealing ring (4331) is movably engaged with the inner wall of the purification cylinder (4).

5. The equipment for preparing a polyethylene water treatment membrane with a hydrophilic coating according to claim 3, characterized in that: The central inner wall of the cross plate (431) is connected to the outer surface of the second outlet pipe (45), the upper end of the second outlet pipe (45) is connected to the inner wall of the first outlet pipe (44), the upper surface of the second outlet pipe (45) is provided with a switch valve, and the inner wall of the lower end of the second outlet pipe (45) is connected to a cross hollow pipe (451).

6. The equipment for preparing a polyethylene water treatment membrane with a hydrophilic coating according to claim 5, characterized in that: The input end of the outlet pipe 1 (44) is connected to the inner wall of the upper end of the purification cylinder (4); the output end of the outlet pipe 1 (44) is fixedly connected to a micro fan (441); the output end of the micro fan (441) is sealed and connected to a heat-resistant hose (442); the other end of the heat-resistant hose (442) is provided with a rectangular exhaust blowing plate (443); the rectangular exhaust blowing plate (443) is detachably mounted on the outside of the scraper (22) by bolts; the inner surface of the rectangular exhaust blowing plate (443) is provided with a central cavity (4430); a diverter plate (4431) is fixedly mounted on the side wall of the central cavity (4430); oblique blowing holes (4432) are respectively provided on both sides of the diverter plate (4431).

7. A method for preparing a polyethylene water treatment membrane with a hydrophilic coating, which is based on the equipment for preparing a polyethylene water treatment membrane with a hydrophilic coating according to any one of claims 1 to 6, and is characterized in that: The preparation method of the polyethylene water treatment membrane with a hydrophilic coating comprises the following steps: Step 1, equipment preparation and commissioning: correctly install all parts of the equipment, check whether all connections are tight, ensure the equipment is running stably, then start the equipment, debug the scraper adjustment parts, ensure that the gap between the scraper (22) and the polyethylene water treatment membrane is uniform, and at the same time, adjust the lighting unit to ensure that the UV light evenly covers the entire membrane surface; Step 2: Preparation of polyethylene water treatment membrane: placing the polyethylene water treatment membrane on the gravure roller coating machine body (1), starting the equipment, and evenly coating the hydrophilic coating on the membrane surface with a scraper (22); Step 3: Light curing: After the coating is completed, the light unit is started, and the UV light lamp group (31) irradiates the film surface to quickly cure the coating; Step 4. Waste gas treatment and emission: The waste gas generated during the coating and lighting process is collected through the heat collecting cover (3) and introduced into the waste gas treatment unit. The waste gas undergoes multi-level filtration to remove harmful substances and ensure that the exhaust gas meets environmental protection standards; Step 5. Equipment cleaning and maintenance: After production is completed, turn off the power supply of the equipment and clean all parts of the equipment.

8. The polyethylene water treatment membrane with a hydrophilic coating prepared by the method for preparing a polyethylene water treatment membrane with a hydrophilic coating according to claim 7 is characterized in that: The polyethylene water treatment membrane comprises a polyethylene membrane and a coating, wherein the polyethylene membrane is an industrially produced wet-process polyethylene diaphragm with a pore size of 0.01 to 0.4 μm; The coating is a hydrophilic coating coated on the surface of a polyethylene film by a UV curing method.

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