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

Abstract

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 preparation equipment and method, the polyethylene water treatment membrane with the hydrophilic coating comprises a polyethylene membrane and a coating; the coating is a hydrophilic coating which is coated on the surface of the polyethylene film through a UV curing method. A scraper adjusting assembly and a scraper are flexibly supported through a movable base, the position of the scraper is convenient to adjust, uniform coating of a coating is ensured, an illumination unit adopts a fine-adjustable design, the illumination range is changed, uniform UV illumination is ensured, acrylate groups are polymerized and crosslinked, a stable curing structure is formed, and the coating is durable; and heat generated by illumination is concentrated through the waste gas treatment unit, and the filtered gas is recycled, so that blowing away of the composition in the film coating advancing direction of the purified gas, uniform coating and synchronous curing in the rear end direction can be met, and time is saved.

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] As the world's most advanced water treatment technology, membrane water treatment technology has been widely used in many fields, including industrial wastewater treatment and reuse, domestic wastewater deep treatment, pure water and ultrapure water preparation, and seawater desalination. Its core lies in the water treatment membrane, which is a medium that can achieve molecular-level separation and filtration. When sewage contacts the membrane, based on the pressure, solution concentration, charge or temperature difference on both sides of the membrane, the molecules of the substance will selectively pass through the membrane, thereby achieving the separation and purification of different components in the sewage. There are many types of water treatment membranes, which can be divided into inorganic membranes, organic membranes and organic-inorganic composite membranes according to the materials. Among them, inorganic membranes are made of inorganic materials such as metals, metal oxides, and ceramics. Although they perform well in the treatment of high-concentration industrial wastewater, they have the disadvantages of high cost, alkali resistance, low elasticity and difficulty in processing and preparation. Organic membranes, especially polyolefins and polyethylenes, are widely used, but generally have poor affinity with water and limited service life. Therefore, it is particularly important to develop a polyethylene water treatment membrane with a hydrophilic coating and its preparation equipment.

[0003] In the prior art, for example, the preparation method of a tubular membrane for water treatment with publication number CN104774026B includes using alumina powder as aggregate, adding silicon carbide whiskers, pore-forming agents, sintering aids and water to mix into slurry and then grinding, aging and drying the slurry, then adding plasticizer and water to grind again, tube mold molding, drying, sintering, and cleaning to obtain a tubular support; adding the ground aluminum isopropoxide to hot deionized water for magnetic stirring, then adding nitric acid, dispersant and defoamer in batches to stir evenly to obtain a sol, and then aging the sol; then sealing the outer surface of the support, and coating, gelling, drying, and sintering. By controlling the hydrolysis temperature and the amount of deionized water, a relatively stable sol can be prepared; at the same time, adding appropriate dispersants and defoamers to the sol helps to improve the wettability of the sol and the surface of the support, improve the film quality, and avoid cracks.

[0004] However, in actual use, the prior art 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 to form a stable cured structure, making the coating durable. Summary of the invention

[0006] In view of the shortcomings of the prior art, the object 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 lasting hydrophilic effect.

[0007] To achieve the above object, the present invention provides the following technical solutions: In the first aspect, a polyethylene water treatment membrane with a hydrophilic coating, the polyethylene water treatment membrane comprises a polyethylene membrane and a coating, the polyethylene membrane is an industrially produced wet-process polyethylene diaphragm, and the diaphragm pore size is 0.01 to 0.4 μm; the coating is a hydrophilic coating applied on 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 active ingredients is any value between 5% and 50%, and the rest is 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 steps such as cleaning and drying, to ensure the cleanliness and flatness of the substrate surface;

[0016] Step 2, coating preparation: dissolving the hydrophilic polymer in a suitable solvent in proportion to form a uniform coating solution, mixing the coating solution and 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 cross-linking reaction under the action of UV light to form a stable cured structure.

[0019] Second aspect, a preparation device for a polyethylene water treatment membrane with a hydrophilic coating, the film coater includes an intaglio roll coater body, a moving base is movably installed on the upper surface of the intaglio roll coater body, the moving base is in 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 rod is movably installed on the inner surface of the placing groove, a slider is movably connected to the inner surface of the limiting groove, inner sides of the sliders are fixedly connected to both ends of the scraper, 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, 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 the movable folding plates are arranged and distributed oppositely, fine adjustment components are arranged on the outer sides of the two groups of the movable folding plates, each fine adjustment component includes a protective cover and a rotating 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 rotating handle, a gear is fixedly connected to the inner end of the rotating handle, and toothed plates are meshingly rotated on the outer surfaces of both sides of the gear, and two groups of the toothed plates are provided.

[0021] Preferably, fixing connecting blocks are fixedly installed on one side surfaces of the two groups of the toothed plates, outer surfaces of the fixing connecting blocks are slidably connected to the inner walls of preset sliding grooves on the inner wall of the heat collecting cover, and the other side surfaces of the fixing connecting blocks are fixedly connected to the outer surfaces of the movable folding plates.

[0022] Preferably, a flange connecting disc is fixedly connected to the lower end of the purification cylinder by bolts, the columnar filter cartridge is detachably installed inside the flange connecting disc, 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 opened on the annular inner wall of the annular seat, a filter plate is movably mounted on the inner surface of the fan-shaped groove, the filter plate is a fan-shaped plate structure divided into four equal parts, a sealing ring is sleeved and mounted on the outer surface of the filter plate, and 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 through the outer surface of the outlet pipe 2, the upper end of the outlet pipe 2 is connected through 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 through 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 with a micro fan, the output end of the micro fan is sealed with 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, the side wall of the focusing cavity is fixedly mounted with a diverter plate, 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 joints are tight, ensure stable operation of the equipment, start the equipment, commission the scraper adjustment parts, ensure that the gap between the scraper and the polyethylene water treatment membrane is uniform, and 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: placing the polyethylene water treatment membrane on the gravure roller coating machine body, starting the equipment, and evenly coating the hydrophilic coating on the membrane surface with a scraper;

[0030] Step 3: Light curing: After coating, start the light unit, and the UV light group irradiates the film surface 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 is filtered at multiple levels 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 is convenient for adjusting the scraper position to ensure uniform coating of the coating. The illumination unit adopts a fine-adjustable 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 gas is recycled after filtration, which can satisfy the dispersion of the composition of the purified gas in the direction of the coating film 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 front three-dimensional structural schematic diagram of the mobile base of the present invention;

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

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

[0039] Figure 5 It is a partial cross-sectional structural schematic diagram 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 It is a schematic diagram of the split cross-sectional structure of the exhaust gas treatment unit of the present invention;

[0042] Figure 8 It is a schematic diagram of the three-dimensional structure of the auxiliary backflush assembly of the present invention;

[0043] Fig. 9 It is a schematic diagram of the disassembled structure of the filter assembly of the present invention;

[0044] Fig.10 is a schematic diagram of a side cross-sectional structure of a lighting unit of the present invention;

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

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

[0047] Fig.13 It is a flow chart of the present invention.

[0048] In the figure: 1, gravure roller coating machine body; 2, mobile base; 20, placement slot; 21, roller bar; 200, limit slot; 22, scraper; 3, heat collecting cover; 4, purification cylinder; 31, UV light lamp group; 32, movable folding plate; 320, strengthening oblique strip; 321, protective cover; 322, turning handle; 323, gear; 324, tooth plate; 325, fixed connecting block; 41, flange connection plate; 42, columnar filter cartridge; 421, driving 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. Wind guide elbow; 4552. Branch pipe. DETAILED DESCRIPTION

[0049] In order to make the purpose and technical solution of the present invention clearly and completely described, and the advantages more clearly understood, the embodiments of the present invention are further described in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are part of the embodiments of the present invention, not all of them, and are only used to explain the embodiments of the present invention, and are not used 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, see 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 is an industrially produced wet-process polyethylene diaphragm, and the diaphragm pore size is 0.01-0.4 μm; the coating is a hydrophilic coating coated on 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 active ingredients is any value between 5% and 50%, and the rest is solvent;

[0057] The method for preparing the polyethylene water treatment membrane comprises the following steps:

[0058] Step 1: Substrate preparation: Select appropriate polyethylene material as the substrate, and pre-treat the selected polyethylene substrate, including steps such as cleaning and drying, to ensure the cleanliness and flatness of the substrate surface; cleaning can remove stains, grease and other impurities 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: dissolving the hydrophilic polymer in a suitable solvent in 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; this step ensures the uniformity and stability of the coating solution, provides high-quality coating materials for the subsequent coating process, and 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 by a coating machine using a roller coating method; the roller coating method has the advantages of uniform coating, fast speed, high efficiency, etc., which 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 for drying to dry the solvent; the dried polyethylene film is then irradiated with a UV lamp for a certain period of time, specifically, a UV curing device is used for a 15s photocuring reaction, so that the acrylate groups in the coating undergo a 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 a polymerization and cross-linking reaction in a short period of 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 (propoxy 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 (propoxy 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 (propoxy 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 a gravure roll coater body, dried at a temperature of 80 °C, and subjected to a photocuring reaction for 15 s 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 a gravure roll coater body 1. A moving base 2 is movably installed on the upper surface of the gravure 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 200 are respectively formed on both sides of the moving base 2. A roller 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 sliders are fixedly connected to both ends of the blade 22. A heat collecting 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 collecting cover 3. A purification cylinder 4 is fixedly installed at the upper end of the heat collecting cover 3. An exhaust gas treatment unit is arranged inside the purification cylinder 4. The lighting unit includes a UV 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 first lead-out pipe 44, and a second lead-out pipe 45.

[0067] Example 4. Referring to the appendix Figure 1-13 On the basis of the third embodiment, 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, two groups of movable folding plates 32 are provided and are relatively distributed, and the outer sides of the two groups of movable folding plates 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. The inner end of the rotating handle 322 is fixedly connected to a gear 323, and the outer surfaces of both sides of the gear 323 are There are tooth plates 324 meshing and rotating, 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 plane plate and an inclined plate, the plane plate and the inclined plate are rotatably connected, the outer side surface of the plane 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, and an angle is formed between the two groups of relatively distributed inclined plates;

[0068] A heat collecting cover 3 is connected to the back side of the scraper 22 to collect the heat generated by the UV light group 31 and the surface of the gravure roller coating machine body 1 during light curing. Figure 5 and Fig.10 As shown, the two groups of movable folding plates 32 are relatively distributed. When the inclination angle of the two groups 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 toothed plates 324 on both sides are adapted to mesh with the outer teeth of the gear 323, so that the toothed plates 324 are relatively movable, and the flat plates respectively connected to the toothed plates 324 slide on the inner side of the heat collecting cover 3. When the two groups of fixed connecting blocks 325 are relatively close, the angle formed between the inclined panels becomes smaller. In this way, the two groups of movable folding plates 32 provide more extensive 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 groups 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] Embodiment 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, and the reinforcing oblique strip 320 is 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, and the corrosion and damage of the movable flap 32 caused by continuous hot air input can be avoided;

[0070] By strengthening the "H"-shaped structure of the oblique strips 320, it is able to disperse and withstand pressure from all sides, especially when facing the continuous hot air input under the heat collecting hood 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] Embodiment 6, refer to the attached Figure 1-13 On the basis of the fifth embodiment, 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 arranged 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 arranged, 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, and 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-shaped structure and is 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-shaped groove 4320 is movably mounted with a filter Plate 433, the filter plate 433 is a four-equally divided 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, 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, the rectangular exhaust blowing plate 443 is detachably installed 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 installed 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 group 31 continuously applies the coating composition and the polyethylene substrate to the gravure roller coating machine body 1 for illumination, the generated hot gas 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 guidance of the lower air flow to rise, so that the exhaust gas can enter the interior of the purification cartridge 4 more efficiently 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 the 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, and the rectangular exhaust blowing plate 443 is located between the roller 21 and the scraper 22. In this way, the initially rolled and evenly mixed composition can be re-blown 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 Fig. 9 As shown, a fan-shaped groove 4320 is provided on the side ring surface of the annular seat 432 for the adapter and mounting of the filter plate 433, so that the saturated filter plate 433 can be conveniently disassembled. The structure is simple and maintenance is convenient. In combination with the sleeve of the sealing ring 4331, the sealing between the purification cylinder 4 and the purification cylinder 4 is enhanced to avoid gas leakage.

[0074] Embodiment 7, refer to the attached Figure 1-13On the basis of the sixth embodiment, in order to realize the blowing of the impurities adhering to the side wall of the purification cylinder 4 and the back-blowing of the filter assembly 43: the central inner wall of the cross plate 431 is connected with the outer surface of the second outlet pipe 45, the upper end of the second outlet pipe 45 is connected with 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 with a cross hollow pipe 451; the lower end of the second outlet pipe 45 is provided with an auxiliary back-blowing assembly, and the auxiliary back-blowing assembly 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 outlet pipe 45 is fixedly connected, the output end of the micro air pump 452 is fixedly connected with an output pipe 453, the lower end of the output pipe 453 is rotatably connected with a rotary joint 454, the central inner surface of the rotary joint 454 is fixedly connected with a hollow storage plate 455, the hollow storage plate 455 is a hollow circular plate structure, the inner wall of the hollow storage plate 455 is connected with an air guide bend 4551, six groups of air guide bend 4551 are provided and are arranged in an equidistant array about the central axis of the hollow storage plate 455, and the inner wall of the air guide bend 4551 is connected with 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 45 can be opened to open the outlet pipe 45 flow channel. Then, most of the purified gas will be discharged from the outlet pipe 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 pipe 451 and the wind guide bend 4551. It should be noted that under the distribution of multiple groups of evenly arranged wind 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 rotating joint 454 and the hollow storage plate 455, the hollow storage plate 455 is driven to rotate as a whole through the reverse thrust, and 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] Embodiment 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: correctly install all parts of the equipment according to the instructions, check whether all connections are tight, ensure stable operation of the equipment, 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;

[0078] 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;

[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 lighting process is collected by the heat collecting cover 3 and introduced into the waste gas treatment unit. The waste gas is filtered at multiple levels 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] Although 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 the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A polyethylene water treatment membrane with a hydrophilic coating, characterized in that: The polyethylene water treatment membrane includes a polyethylene membrane and a coating. The polyethylene membrane is a wet-process polyethylene separator that has been industrially produced, and the pore size of the separator is 0.01 - 0.4 μm; The coating is a hydrophilic coating coated on the surface of the polyethylene membrane by a UV curing method.

2. A preparation device for a polyethylene water treatment membrane with a hydrophilic coating, used for preparing a polyethylene water treatment membrane with a hydrophilic coating as claimed in claim 1, characterized in that: It includes a gravure roll coater body (1). A moving base (2) is movably installed on the upper surface of the gravure roll coater body (1). The moving base (2) has a "冂"-shaped frame structure. A knife-edge adjuster is fixedly installed at the upper end of the moving base (2). The output end of the knife-edge adjuster 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).

3. The equipment for preparing a polyethylene water treatment membrane with a hydrophilic coating according to claim 2, characterized in that: 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 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). Tooth plates (324) are meshed and rotated on the outer surfaces of both sides of the gear (323). Two groups of tooth plates (324) are provided.

4. The equipment for preparing a polyethylene water treatment membrane with a hydrophilic coating according to claim 3, characterized in that: Fixed connecting blocks (325) are fixedly installed on one side surface of the two groups of tooth 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).

5. The equipment for preparing a polyethylene water treatment membrane with a hydrophilic coating according to claim 2, 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.

6. The equipment for preparing a polyethylene water treatment membrane with a hydrophilic coating according to claim 5, characterized in that: The filter assembly (43) is provided in two groups, and the two groups of the filter assembly (43) are installed inside the purification cylinder (4). The filter assembly (43) comprises 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 in a "cross"-shaped plate structure and is fixedly installed on the inner side of the annular seat (432).

7. The equipment for preparing a polyethylene water treatment membrane with a hydrophilic coating according to claim 6, 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 structure divided into 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).

8. The equipment for preparing a polyethylene water treatment membrane with a hydrophilic coating according to claim 6, 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 tube (451).

9. The equipment for preparing a polyethylene water treatment membrane with a hydrophilic coating according to claim 8, characterized in that: The input end of the outlet pipe (44) is connected to the inner wall of the upper end of the purification cylinder (4); the output end of the outlet pipe (44) is fixedly connected to a micro fan (441); the output end of the micro fan (441) is sealedly 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 outer side 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).

10. A method for preparing a polyethylene water treatment membrane with a hydrophilic coating, which is realized based on the preparation equipment for a polyethylene water treatment membrane with a hydrophilic coating according to claims 2-9, 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 according to the instructions, check whether all joints are tight, ensure stable operation of the equipment, then start the equipment, commission 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 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 is filtered at multiple levels 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 of the equipment and clean all parts of the equipment.

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