Ecological bacteriostatic high-stability PES ultrafiltration membrane preparation device and method

Abstract

The invention discloses a device and a method for preparing an ecological bacteriostatic high-stability PES (Polyether Sulfonate) ultrafiltration membrane. The device is provided with a plurality of raw material storage tanks, raw materials are conveyed to a stirring tank through a discharging pipe with an electric valve and a screw pump to be mixed into a membrane casting solution, and then the membrane casting solution is conveyed to a membrane scraping forming machine through a peristaltic pump to form an ultrafiltration membrane. The formed ultrafiltration membrane is sequentially cooled by the spraying pipe and dried by the air knife mechanism, and the air knife mechanism is matched with mechanical linkage structures such as a turbofan to enable the clamping rods to swing, so that water on the surface of the membrane is quickly thrown away to improve the efficiency. And finally, winding is conducted through the winding structure. The preparation method comprises the steps of raw material preparation, conveying and mixing, film scraping and forming, post-treatment, rolling and the like. Through the unique device and process, the prepared PES ultrafiltration membrane has the ecological antibacterial performance and high stability, the preparation process is accurate and controllable, the production efficiency is high, the requirements of multiple fields for high-quality ultrafiltration membranes can be met, and the PES ultrafiltration membrane has good application prospects.

Description

Technical Field

[0001] The invention relates to the technical field of ultrafiltration membrane preparation, and in particular to a device and method for preparing an eco-antibacterial high-stable PES ultrafiltration membrane. Background Art

[0002] In many fields of industrial production, environmental protection, biomedicine, etc. today, separation and filtration technology plays a vital role. As a highly efficient separation material, ultrafiltration membrane can selectively separate substances of different particle sizes at the molecular level by virtue of its unique screening mechanism, and is therefore widely used in various complex separation scenarios. For example, in industrial wastewater treatment, ultrafiltration membrane can effectively intercept macromolecular organic matter, colloids and other impurities in wastewater to achieve water resource recycling and reuse; in the field of biomedicine, ultrafiltration membrane is used in the concentration and purification process of biological products such as proteins and vaccines to ensure product quality and safety; in the food and beverage industry, it can remove impurities, microorganisms, etc., to improve product quality and shelf life.

[0003] Polyethersulfone (PES) ultrafiltration membrane has many excellent properties, such as excellent chemical stability, which enables it to withstand the erosion of various chemical reagents and maintain good structural integrity when in contact with solutions to be filtered with different pH values; good thermal stability, which enables it to work normally within a certain temperature range and meet the requirements of some processes that require high temperature treatment or thermal disinfection; and relatively high mechanical strength, which allows it to withstand a certain amount of pressure without breaking easily, thus ensuring the continuity of the filtration process. Therefore, it occupies a very important position in the ultrafiltration membrane market and its application range is expanding.

[0004] However, with the continuous expansion of the use scenarios of PES ultrafiltration membranes, some of its limitations have gradually become apparent. One of the more prominent problems is microbial contamination. In many practical application scenarios, such as long-term water treatment systems or biological product processing links, the surface of the ultrafiltration membrane can easily become a breeding ground for microorganisms. Microorganisms such as bacteria and fungi will attach to the membrane surface and continue to multiply. On the one hand, these microorganisms and their secreted metabolites may clog the pores of the ultrafiltration membrane, resulting in a decrease in the flux of the membrane, that is, a decrease in the liquid flow through the membrane per unit time, thereby affecting the filtration efficiency; on the other hand, the long-term presence of microorganisms may also corrode the membrane material, destroy the structure of the membrane, further shorten the service life of the ultrafiltration membrane, increase the cost of use, and the human and material consumption caused by the frequent replacement of membrane components.

[0005] Although the PES ultrafiltration membrane itself has certain chemical, thermal and mechanical stability, the stability of existing products still needs to be improved under some harsh working conditions. For example, when treating industrial wastewater containing strong oxidizing substances, some PES ultrafiltration membranes may be oxidatively degraded due to the attack of chemical substances, resulting in the deterioration of membrane performance; the thermal stability of the membrane is also tested under frequent temperature changes or long-term operation at high operating temperatures, and the membrane structure may be deformed, the porosity may change, etc.; moreover, when subjected to high pressure or external impact, the mechanical strength of some ultrafiltration membranes is not enough to maintain their structural stability, and they are prone to rupture and damage, affecting the normal operation of the entire filtration system and failing to stably provide high-quality filtration effects.

[0006] From the perspective of preparation, some of the processes and related devices currently used to produce PES ultrafiltration membranes have certain defects. In the raw material mixing stage, some traditional devices are difficult to ensure that different raw materials (such as resins, additives, etc.) can be fully and evenly mixed, which easily leads to inconsistent performance of various parts of the prepared ultrafiltration membrane, affecting the stability and consistency of product quality. In the process of conveying the casting liquid, there is a lack of effective means to accurately control the flow rate, which may cause the amount of casting liquid entering the scraping film forming stage to be unstable, thereby affecting the key performance indicators of the ultrafiltration membrane such as thickness and uniformity. In addition, in the post-processing stage after the ultrafiltration membrane is formed, the further optimization of the membrane structure and the drying operations are not precise and efficient enough, and the potential performance of the material cannot be fully utilized. It is also difficult to ensure that the prepared ultrafiltration membrane can achieve a high level of stability and comprehensive performance, which limits the promotion and use of the product in high-end application fields that have strict requirements on the performance of ultrafiltration membranes.

[0007] In view of the many problems existing in the above-mentioned existing PES ultrafiltration membranes and their preparation processes and devices, an innovative solution is urgently needed to improve the ecological antibacterial ability of the ultrafiltration membrane, enhance its stability, and improve the preparation process and device to achieve more accurate and efficient production. The present invention proposes an ecological antibacterial high-stability PES ultrafiltration membrane preparation device and method to address these problems. It aims to overcome the shortcomings of the existing technology through optimized device structure, reasonable process flow and scientific application of key materials, and prepare high-quality PES ultrafiltration membranes that can effectively inhibit microbial contamination and have high stability, meet the growing high-performance and high-quality application needs of various industries for ultrafiltration membranes, and promote the reliable application and further development of ultrafiltration membrane technology in more key fields. Summary of the invention

[0008] The purpose of the present invention is to provide an apparatus and method for preparing an eco-inhibitory and highly stable PES ultrafiltration membrane, aiming to solve the problems that the existing PES ultrafiltration membrane lacks eco-inhibitory performance, is insufficiently stable, and the existing preparation apparatus and process are difficult to accurately control the membrane quality. By optimizing the apparatus structure and preparation process, a high-quality PES ultrafiltration membrane with both eco-inhibitory function and high stability is prepared.

[0009] Technical Solution

[0010] Overall structure of the device

[0011] Raw material storage and transportation part: It includes multiple raw material storage tanks, which are used to store raw materials such as polyethersulfone PES resin, ecological antibacterial agent, pore-forming agent and additives for improving membrane hydrophilicity. The bottom of each raw material storage tank is connected to the first discharge pipe, and the middle section of the first discharge pipe is equipped with an electric valve for accurately controlling the discharge amount of raw materials. The tail end of the first discharge pipe is connected to the same connecting pipe, and the second discharge pipe at the bottom of the connecting pipe is connected to the stirring tank. A screw pump is installed in the middle section of the second discharge pipe, and the raw materials are stably transported to the stirring tank for mixing by the screw pump.

[0012] Stirring and mixing part: The stirring tank is equipped with stirring blades, which are driven by a motor to rotate and fully stir the incoming raw materials to form a uniform casting liquid. The third discharge pipe at the bottom of the stirring tank is equipped with a peristaltic pump, which accurately controls the flow of the casting liquid and delivers it to the scraping film forming machine.

[0013] Scraping film forming part: The scraping film forming machine can evenly scrape the casting liquid on the substrate to form a wet film with a certain thickness and uniformity. By adjusting the relevant parameters of the scraping knife and the moving speed of the scraping platform, the initial forming quality of the ultrafiltration membrane can be accurately controlled.

[0014] Post-processing part: Spray pipes and air knife mechanisms for cooling are arranged above the ultrafiltration membrane output from the scraping film forming machine. The spray pipe sprays and cools the ultrafiltration membrane to further stabilize and solidify its structure. The air knife mechanism removes excess liquid on the membrane surface by blowing out high-speed airflow, and turbofans are arranged at the lower part of both ends of the air knife mechanism. The turbofan drives the upper lifting frame up and down through a series of mechanical linkage structures including a rotating shaft, a first bevel gear, a second bevel gear, a transmission shaft, a shaft seat, a turntable, etc., and then the clamping rod connected to the lifting frame swings up and down. The clamping rod produces a vibration effect on the ultrafiltration membrane sliding through it, prompting the water on the membrane surface after spraying to be quickly thrown off, thereby improving the drying efficiency of the air knife mechanism and the subsequent drying speed.

[0015] Winding part: A winding structure is provided at the end of the post-treated ultrafiltration membrane, which is composed of a tension roller, a guide roller and a winding roller. The tension of the membrane is monitored and fed back in real time through the tension roller, the speed of the winding roller motor is adjusted, and the ultrafiltration membrane is neatly and tightly wound with the guidance of the guide roller.

[0016] Preparation method flow

[0017] Raw material preparation: prepare polyethersulfone PES resin, ecological antibacterial agent, pore-forming agent and additives to improve membrane hydrophilicity that meet the quality requirements, load them into the raw material storage tanks accordingly, check the connection of each equipment and pipeline to ensure that they are in normal and operational state.

[0018] Raw material transportation and mixing: According to the preset raw material ratio, open the electric valves on each first discharge pipe, start the screw pump, transport the raw materials to the mixing tank, and start the stirring motor in the mixing tank at the same time. The raw materials are fully stirred and mixed according to the set stirring speed and time to form a uniform casting liquid.

[0019] Casting liquid transportation: After the stirring is completed, start the peristaltic pump on the third discharge pipe, set the appropriate flow parameters, and smoothly transport the casting liquid to the scraping film forming machine.

[0020] Scraping film forming: In the scraping film forming machine, adjust the relevant parameters of the scraping knife and the scraping film platform, evenly scrape the casting liquid on the substrate to form a wet film, control the temperature and other environmental conditions during the scraping process, and ensure the initial forming quality of the film.

[0021] Post-treatment: The wet membrane is first cooled by spraying in the spray pipe, and then enters the area where the air knife mechanism is located. While the air knife is drying, the vibration of the clamping rod generated by the mechanical linkage associated with the air knife mechanism is used to accelerate the removal of moisture on the membrane surface. After that, it enters the drying area for deep drying, so that the ultrafiltration membrane reaches an ideal dry state.

[0022] Winding: The dried ultrafiltration membrane is rolled up through the winding structure, and the tension roller and the guide roller work together to ensure that the membrane has appropriate tension and is wound neatly during the winding process, and finally an ecological antibacterial and highly stable PES ultrafiltration membrane product is obtained.

[0023] Beneficial Effects

[0024] Excellent ecological antibacterial performance: By adding specific ecological antibacterial agents, the prepared PES ultrafiltration membrane has the ability to inhibit the growth of microorganisms. During use, it can effectively reduce the attachment and reproduction of microorganisms such as bacteria and fungi. It is especially suitable for filtration environments with high hygiene requirements, such as filtration and separation in food processing, biomedicine and other fields. It extends the service life of the ultrafiltration membrane and reduces the replacement frequency and cost caused by microbial contamination.

[0025] High stability guarantee: In the selection of raw materials, we pay attention to the quality and compatibility of each component, and through precise stirring and mixing, stable casting liquid delivery and accurate film scraping and forming control, combined with the further stabilization of the membrane structure during the post-processing process, the prepared ultrafiltration membrane has excellent performance in chemical stability, thermal stability and mechanical properties, and can work stably for a long time under complex and changeable working conditions, ensuring the consistency and reliability of the filtration effect.

[0026] The preparation process is precise and controllable: the flow of raw materials and casting liquid is precisely controlled by means of electric valves, screw pumps, peristaltic pumps, etc. on each discharge pipe; the scraping parameters can be adjusted by the scraping machine; the temperature, wind speed and other parameters in the post-processing link can be set as needed; coupled with the real-time monitoring and regulation of the tension by the winding structure, the entire preparation process can be precisely controlled, and the various performance indicators of the ultrafiltration membrane can be flexibly adjusted according to different application requirements, thereby improving the consistency and stability of product quality and facilitating industrial large-scale production.

[0027] Improve production efficiency: The air knife mechanism cooperates with the unique mechanical linkage structure to accelerate the removal of moisture on the membrane surface through the vibration of the clamp rod, improve the air knife drying efficiency and subsequent drying speed, shorten the time cycle of the entire ultrafiltration membrane preparation, and while ensuring product quality, improve production efficiency, reduce production costs, and enhance product competitiveness in the market.

[0028] The device and method of the present invention can effectively solve the problems existing in the prior art, and prepare an ecological antibacterial and highly stable PES ultrafiltration membrane that meets the high-quality separation and filtration needs in multiple fields, which has significant practical value and good market application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only for the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 It is a schematic diagram of the three-dimensional structure of an embodiment of the present invention;

[0031] Figure 2 It is a schematic diagram of the three-dimensional structure of an embodiment of the present invention;

[0032] Figure 3 A schematic diagram of a linkage water removal structure according to an embodiment of the present invention;

[0033] Figure 4 A schematic diagram of a linkage water removal structure according to an embodiment of the present invention;

[0034] Figure 5 For the embodiment of the present invention Figure 1 A schematic diagram of the enlarged local structure at A;

[0035] Figure 6 For the embodiment of the present invention Figure 1 A schematic diagram of the enlarged local structure at B;

[0036] Figure 7 For the embodiment of the present invention Figure 2 An enlarged schematic diagram of the local structure at location C.

[0037] The markings in the figure are:

[0038] 1. Raw material storage tank; 2. First discharge pipe; 3. Electric valve; 4. Connecting pipe; 5. Second discharge pipe; 6. Screw pump; 7. Mixing tank; 8. Third discharge pipe; 9. Peristaltic pump; 10. Scraping film forming machine; 11. Ultrafiltration membrane; 12. Spray pipe; 13. Wind knife mechanism; 14. Turbofan; 15. Support frame; 16. Rotating shaft; 17. First bevel gear; 18. Second bevel gear; 19. Transmission shaft; 20. Shaft seat; 21. Turntable; 22. Protrusion; 23. Lifting frame; 24. Dome contact; 25. Connecting rod; 26. Clamping rod; 27. Sliding rod; 28. Spring; 29. ​​Baffle; 30. Limit plate. DETAILED DESCRIPTION

[0039] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. At the same time, it is explained here that in order to make the embodiments more detailed, the following embodiments are the best and preferred embodiments, and those skilled in the art may also adopt other alternatives to implement some known technologies; and the accompanying drawings are only for more specific description of the embodiments, and are not intended to specifically limit the present invention.

[0040] It should be noted that the references to "one embodiment", "an embodiment", "an exemplary embodiment", "some embodiments" and the like in the specification indicate that the embodiments described may include specific features, structures or characteristics, but not every embodiment may include the specific features, structures or characteristics. In addition, when a specific feature, structure or characteristic is described in conjunction with an embodiment, it should be within the knowledge of a person skilled in the art to implement such feature, structure or characteristic in conjunction with other embodiments (whether or not explicitly described).

[0041] In general, a term can be understood, at least in part, from its use in context. For example, depending, at least in part, on the context, the term "one or more" as used herein can be used to describe any feature, structure, or characteristic in the singular sense, or can be used to describe a combination of features, structures, or characteristics in the plural sense. Additionally, the term "based on" can be understood as not necessarily intended to convey an exclusive set of factors, but can instead, depending, at least in part, on the context, allow for the presence of other factors that are not necessarily explicitly described.

[0042] Example 1

[0043] See also Figures 1 to 7

[0044] 1. Raw material preparation stage

[0045] Polyethersulfone (PES) resin preparation

[0046] Polyethersulfone (PES) resin with appropriate molecular weight and purity is selected as the basic raw material of ultrafiltration membrane. The resin needs to have good thermal stability, chemical tolerance and film-forming performance. The purchased PES resin raw material is pretreated, such as removing possible impurities and lumps, and ensuring that it is in a uniform, dry and pure state through screening, drying and other operations. Then it is loaded into a special first raw material storage tank 1. The storage tank should have good sealing to prevent external impurities, moisture, etc. from mixing in. At the same time, a liquid level sensor is installed to facilitate real-time monitoring of the inventory of the resin in the tank.

[0047] Preparation of ecological antibacterial agent

[0048] The ecological antibacterial agent is a component with antibacterial function made from natural plant extracts, for example, effective antibacterial components are extracted from plants with antibacterial properties, and further purified, concentrated and other process treatments are performed to achieve an ideal level of antibacterial activity. The treated ecological antibacterial agent is placed in the second raw material storage tank (1). The material of the storage tank must ensure that it will not chemically react with the antibacterial agent, and it is also equipped with corresponding sealing and monitoring devices to ensure the stability of the quality of the antibacterial agent, so that the antibacterial property can be effectively imparted to the ultrafiltration membrane in the subsequent preparation process.

[0049] Porogen Preparation

[0050] The porogen is a commonly used and suitable material such as polyethylene glycol PEG. According to the pore size, porosity and other parameter requirements of the desired ultrafiltration membrane, polyethylene glycol with a specific molecular weight range is selected. Before use, the required amount of polyethylene glycol is accurately weighed and ensured to be completely dissolved or evenly dispersed if it is in a solid state, and then loaded into the third raw material storage tank 1. The inside of the storage tank should be kept clean to prevent other impurities from mixing in and affecting the performance of the porogen and the subsequent regulation of the pore structure of the ultrafiltration membrane.

[0051] Preparation of additives to improve membrane hydrophilicity

[0052] For the additives to improve the hydrophilicity of the membrane, select chemical substances with good hydrophilicity and good compatibility with PES resin and other raw materials, such as some polymers or small molecule compounds containing hydrophilic groups such as hydroxyl and carboxyl. After accurate measurement, the additives are loaded into the fourth raw material storage tank 1. This storage tank must also be well sealed and protected and the inventory monitored to ensure that the additives can fully play the role of enhancing the hydrophilicity and anti-pollution ability of the ultrafiltration membrane during the mixing process.

[0053] 2. Raw material transportation and mixing stage

[0054] Discharge control

[0055] The middle section of the first discharge pipe 2 at the bottom of each raw material storage tank 1 is equipped with an electric valve 3. Before the preparation begins, the opening degree and opening time of each electric valve 3 are set through the control system according to the preset raw material ratio to accurately control the discharge amount of each raw material. These valves can realize fast and accurate opening and closing actions, and are linked with subsequent conveying equipment to ensure that the raw materials are discharged stably in the set order and flow rate.

[0056] Transport to mixing tank 7

[0057] After the electric valve 3 is opened, each raw material flows into the connecting pipe 4 through the first discharge pipe 2, and then converges into the second discharge pipe 5 through the connecting pipe 4. The screw pump 6 located in the middle section of the second discharge pipe 5 starts working, and the screw pump 6 relies on the rotation of the screw to stably transport the raw materials toward the stirring tank 7. The speed of the screw pump 6 can be adjusted according to actual production needs, and its delivery pressure can meet the requirements of overcoming the pipeline resistance and smoothly transporting the raw materials to the stirring tank 7. At the same time, it can ensure that the state of the raw materials will not be destroyed during the transportation process, and maintain the stability of the relative proportion between the raw materials.

[0058] Stir to mix

[0059] After the raw materials enter the stirring tank 7, the stirring paddle pre-installed in the stirring tank 7 can adopt a multi-layer blade structure to achieve sufficient stirring of the raw materials at different levels and start to rotate under the drive of the stirring motor. The stirring speed can be adjusted according to the characteristics of the raw materials and the mixing requirements. Generally, a lower speed is used for preliminary stirring to make the raw materials initially dispersed evenly, and then the speed is gradually increased for deep stirring to ensure that the raw materials such as polyethersulfone PES resin, ecological antibacterial agent, porogen and additives for improving the hydrophilicity of the membrane are fully and evenly mixed in the stirring tank 7 to form a casting liquid with stable performance and uniform distribution of various components.

[0060] 3. Casting liquid transportation stage

[0061] The uniformly stirred casting liquid is output from the third discharge pipe 8 at the bottom of the stirring tank 7, and the peristaltic pump 9 installed in the middle of the third discharge pipe 8 starts to work. The peristaltic pump 9 delivers the casting liquid by squeezing the elastic delivery pipe. The operator sets the flow parameters of the peristaltic pump 9 in the control system according to the thickness, width and production speed of the required ultrafiltration membrane. The peristaltic pump 9 can accurately and smoothly deliver the casting liquid to the scraping film forming machine 10 according to the set flow rate, ensuring that the amount of casting liquid entering the scraping film forming link is stable and meets the process requirements, providing a guarantee for the subsequent precise control of the ultrafiltration membrane forming quality.

[0062] 4. Ultrafiltration membrane forming stage

[0063] After the casting liquid enters the scraping film forming machine 10, a suitable substrate is pre-placed on the workbench of the scraping film forming machine 10. The scraping knife, driven by the motor, scrapes the casting liquid evenly on the substrate according to the set scraping film thickness, scraping film speed and other parameters to form a wet film with a certain thickness and uniformity. The height, angle of the scraping knife and the moving speed of the scraping film platform can be adjusted by a precise adjustment device to meet the production needs of ultrafiltration membranes with different specifications and performance requirements. At the same time, a heating or constant temperature device can be set inside the scraping film forming machine 10 to maintain a suitable temperature environment, so as to help the casting liquid to be better formed on the substrate and make the initially formed ultrafiltration membrane structure more stable and uniform.

[0064] 5. Ultrafiltration membrane post-treatment stage

[0065] Spray cooling

[0066] The ultrafiltration membrane 11 output from the scraping film forming machine 10 enters the subsequent processing area, and first passes under the top spray pipe 12, on which multiple nozzles are evenly distributed, and the nozzles are connected to the coolant supply system. The coolant is sprayed on the surface of the ultrafiltration membrane 11 through the nozzles at a suitable pressure and flow rate, cooling the newly formed ultrafiltration membrane, allowing it to cool and solidify quickly, further stabilizing the structure of the membrane, and preventing the membrane structure from deformation during subsequent operations.

[0067] Air knife drying and clamping rod vibration assistance

[0068] After spray cooling, the ultrafiltration membrane 11 immediately reaches the location of the wind knife mechanism 13. The wind knife mechanism 13 generates a high-speed airflow through a high-pressure blower, and the airflow blows out from the slit of the wind knife, acting on the surface of the ultrafiltration membrane 11 with a strong impact force, and begins to remove the coolant and other excess liquid components remaining on the membrane surface.

[0069] At the same time, the turbofans 14 arranged at the lower parts of both ends of the wind knife mechanism 13 start to rotate synchronously. When the turbofan 14 rotates, it drives the coaxial rotating shaft 16 to rotate. The outer peripheral surface of the rotating shaft 16 is rotatably sleeved on the support frame 15 to ensure the stability of the rotation. The first bevel gear 17 coaxially arranged at the bottom end of the rotating shaft 16 meshes with the corresponding second bevel gear 18 for transmission. The second bevel gear 18 drives the coaxial transmission shaft 19 to rotate. The outer peripheral surface of the transmission shaft 19 is stably supported by the shaft seat 20. The turntable 21 coaxially arranged at the end of the transmission shaft 19 away from the second bevel gear 18 rotates accordingly, and a number of protrusions 22 evenly distributed on the outer peripheral surface of the turntable 21 begin to make circular motion.

[0070] The arc convex parts of the ends of the dome contacts 24 at the bottom of both ends of the lifting frame 23 above the turntable 21 slide against the top of the protrusion 22. As the turntable 21 rotates, the dome contacts 24 drive the lifting frame 23 to move up and down under the push of the protrusion 22. The connecting rods 25 vertically arranged at both ends of the top of the lifting frame 23 are connected to the clamping rod 26. The clamping rod 26 is sleeved on the top of the connecting rod 25 and can slide up and down a certain distance relative to it. The ultrafiltration membrane 11 slides through the gap between the opposite surfaces of the clamping rod 26. In this way, the clamping rod 26 swings up and down under the drive of the lifting frame 23, so that the surface of the ultrafiltration membrane 11 produces a vibration effect.

[0071] This vibration can allow the residual water on the surface of the ultrafiltration membrane 11 after spraying to overcome the surface tension under the action of vibration and be quickly thrown off the membrane surface, greatly improving the drying efficiency of the wind knife 13, so that the wind knife 13 can remove most of the moisture on the membrane surface more quickly, while also paving the way for the subsequent drying process and effectively improving the drying speed.

[0072] In order to ensure the stability and regularity of the up and down movement of the lifting frame 23, sliding rods 27 are slidably inserted at both ends of the lifting frame 23. The baffle 29 at the top of the sliding rod 27 is used to prevent the sliding rod 27 from escaping from the lifting frame 23. The spring 28 sleeved on the outer peripheral surface of the sliding rod 27 between the bottom of the baffle 29 and the top of the lifting frame 23 plays a role of buffering and resetting during the up and down movement of the lifting frame 23, and the limit plate 30 sleeved on the lower part of the sliding rod 27 limits the lowest position of the lifting frame 23, ensuring that the vibration effect of the clamping rod 26 on the ultrafiltration membrane 11 is always within a reasonable range, thereby avoiding damage to the ultrafiltration membrane 11.

[0073] Drying

[0074] The ultrafiltration membrane 11, which has been dried by the wind knife and assisted by the clamp rod vibration, continues to move forward and enters the drying area. Multiple sets of heating devices and circulating fans are arranged in the drying area. The heat generated by the heating devices keeps a suitable high temperature environment in the drying area. The circulating fan causes the hot air to circulate evenly in the drying area, ensuring that all parts of the ultrafiltration membrane 11 can fully contact the hot air, accelerating the evaporation of residual water on the membrane surface, making the ultrafiltration membrane 11 reach an ideal degree of dryness, further stabilizing the performance of the membrane, and preparing for the final winding.

[0075] 6. Ultrafiltration membrane winding stage

[0076] The dried ultrafiltration membrane 11 enters the winding structure, which is mainly composed of a tension roller, a guide roller and a winding roller. The tension roller monitors the tension of the ultrafiltration membrane 11 in real time and feeds back the signal to the control system. The control system adjusts the motor speed of the winding roller according to the tension feedback to ensure that the tension of the membrane is always kept within the appropriate range during the winding process, avoiding the membrane from being too loose or too tight, and preventing the membrane from wrinkling, stretching and deformation. The guide roller guides the ultrafiltration membrane 11 to be accurately and smoothly wound on the winding roller through reasonable layout and rotation. The winding roller adopts an inflatable shaft structure to facilitate the loading and unloading of the membrane roll, and finally the prepared ecological antibacterial high-stability PES ultrafiltration membrane is neatly and compactly produced into a roll, completing the entire ultrafiltration membrane preparation process.

[0077] During the entire ultrafiltration membrane preparation process, the equipment parameters of each link and the operation status of the mechanical linkage components can be monitored, adjusted and recorded in real time through the control system, which is convenient for operators to grasp the production status in time and deal with problems in time. It is also convenient for subsequent optimization and improvement of the production process to improve the preparation quality and production efficiency of ultrafiltration membranes.

[0078] The above specific implementation methods describe in detail the complete operation process of the invention from raw materials to finished products. In practical applications, the parameters and device structures of each link can be further optimized and improved according to specific production conditions, product performance requirements and other factors to achieve the best preparation effect.

[0079] The present invention covers any substitution, modification, equivalent method and scheme made on the essence and scope of the present invention. In order to make the public have a thorough understanding of the present invention, specific details are described in detail in the following preferred embodiments of the present invention, but those skilled in the art can fully understand the present invention without the description of these details. In addition, in order to avoid unnecessary confusion about the essence of the present invention, well-known methods, processes, procedures, components and circuits are not described in detail.

[0080] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. An ecological antibacterial high-stability PES ultrafiltration membrane preparation device, comprising a plurality of raw material storage tanks (1) for storing raw materials, wherein the bottom ends of the raw material storage tanks (1) are all connected to a first discharge pipe (2), the tail ends of the first discharge pipes (2) are connected to the same connecting pipe (4), a second discharge pipe (5) is provided at the bottom of the connecting pipe (4), the tail end of the second discharge pipe (5) is connected to a stirring tank (7), the bottom end of the stirring tank (7) is provided with a third discharge pipe (8), and the second discharge pipe (5) is connected to a stirring tank (7) at the bottom. A screw pump (6) is installed in the middle section of the material pipe (5), a peristaltic pump (9) is installed in the middle section of the third discharge pipe (8), the tail end of the third discharge pipe (8) is connected to a scraping film forming machine (10) for forming an ultrafiltration membrane, a plurality of ultrafiltration membranes (11) are arranged at the output end of the scraping film forming machine (10), a winding structure is arranged at the tail end of the ultrafiltration membrane (11), a spray pipe (12) for cooling and an air knife mechanism (13) are arranged at the top of the ultrafiltration membrane (11), and the characteristics are as follows: The wind knife mechanism (13) is provided with a turbofan (14) at the lower part of both ends, the turbofan (14) is coaxially provided with a rotating shaft (16) at the bottom, the outer circumference of the rotating shaft (16) is provided with a support frame (15) for rotation, the bottom end of the rotating shaft (16) is coaxially provided with a first bevel gear (17), one end of the first bevel gear (17) is meshed with a second bevel gear (18), the second bevel gear (18) is coaxially provided with a transmission shaft (19), the outer circumference of the transmission shaft (19) is provided with a shaft seat (20) for rotation, and the transmission shaft (19) is coaxially provided with a rotating shaft at one end away from the second bevel gear (18). A turntable (21) is provided with a plurality of protrusions (22) distributed at equal distances on the outer peripheral surface of the turntable (21); a same lifting frame (23) is provided above the turntable (21); dome contacts (24) are provided at the bottom of both ends of the lifting frame (23); arc-shaped protrusions at the ends of the dome contacts (24) slide against the tops of the protrusions (22); connecting rods (25) are vertically provided at both ends of the top of the lifting frame (23); two clamping rods (26) are sleeved on the top of the connecting rods (25); and the ultrafiltration membrane (11) slides through the gap between the opposite surfaces of the clamping rods (26).

2. The device for preparing an ecological antibacterial high-stability PES ultrafiltration membrane according to claim 1, characterized in that: Slide rods (27) are slidably inserted at both ends of the lifting frame (23), and a baffle (29) is coaxially provided at the top of the slide rod (27). A spring (28) is sleeved on the outer circumference of the slide rod (27) at a position between the bottom of the baffle (29) and the top of the lifting frame (23).

3. The device for preparing an ecological antibacterial high-stability PES ultrafiltration membrane according to claim 2, characterized in that: The lower part of the slide rod (27) is sleeved with a limit plate (30), and the bottom of the lifting frame (23) is against the top of the limit plate (30).

4. The device for preparing an ecological antibacterial high-stability PES ultrafiltration membrane according to claim 1, characterized in that: The middle section of the first discharge pipe (2) is equipped with an electric valve (3).

5. The device for preparing an ecological antibacterial high-stability PES ultrafiltration membrane according to claim 1, characterized in that: The raw material storage tank (1) includes the following: The first raw material storage tank is used to store polyethersulfone (PES) resin, which is the basic polymer material for preparing ultrafiltration membranes, provides the main structural framework of the membrane, and ensures the basic physical properties and chemical stability of the membrane; The second raw material storage tank is used to store ecological antibacterial agents, which are ingredients with antibacterial functions made from natural plant extracts, and can give the ultrafiltration membrane ecological antibacterial properties to inhibit the growth of microorganisms, so that the ultrafiltration membrane can effectively reduce the attachment and reproduction of microorganisms such as bacteria and fungi during use; The third raw material storage tank is used to store porogens. By reasonably controlling the amount of porogens added, the pore structure of the ultrafiltration membrane can be adjusted to achieve the filtering and separation function of substances with different particle sizes and optimize the filtering efficiency of the ultrafiltration membrane; The fourth raw material storage tank is used to store an additive for improving the hydrophilicity of the membrane. The additive can enhance the hydrophilicity of the surface of the ultrafiltration membrane, which helps to improve the anti-pollution ability of the membrane, so that when filtering liquid containing impurities, impurities are not easily adsorbed on the membrane surface, thereby extending the service life of the ultrafiltration membrane and maintaining stable filtering performance; The raw materials in the above raw material storage tanks are transported into the stirring tank (7) according to the set ratio through the first discharge pipe (2), the connecting pipe (4), the second discharge pipe (5) and other conveying paths for sufficient mixing, thereby ensuring that the subsequently prepared ecological antibacterial high-stability PES ultrafiltration membrane has the required excellent properties.

6. The method for preparing an ecological antibacterial high-stable PES ultrafiltration membrane according to any one of claims 1 to 5, characterized in that: The following steps are involved: S1. Raw material mixing: The polyethersulfone (PES) resin, the ecological antibacterial agent, the pore-forming agent and the auxiliary agent for improving the hydrophilicity of the membrane are respectively transported from the first raw material storage tank, the second raw material storage tank, the third raw material storage tank and the fourth raw material storage tank to the stirring tank (7) through the first discharge pipe (2), the connecting pipe (4) and the second discharge pipe (5); The raw materials are fully mixed in a stirring tank (7) to obtain a uniform preparation liquid; S2, molding preparation: the uniformly mixed preparation liquid is transported to the scraping film molding machine (10) through the third discharge pipe (8) by the peristaltic pump (9), and an ultrafiltration membrane (11) having a desired thickness and pore structure is molded; S3, spray cooling: the ultrafiltration membrane (11) after scraping and forming is evenly sprayed with cooling water on the surface of the spray pipe (12) to cool down; S4, vibration water removal: when the ultrafiltration membrane (11) passes through the clamping rod (26), the lifting frame (23) swings up and down to drive the clamping rod (26) to exert a vibration effect on the surface of the ultrafiltration membrane (11), so that the sprayed water is quickly thrown off the surface of the ultrafiltration membrane (11) under the action of vibration; S5, air knife drying: the ultrafiltration membrane (11) after the vibration water removal treatment is further passed through the air knife mechanism (13), and the high-speed airflow generated by the turbofan (14) is used to efficiently dry the ultrafiltration membrane (11); S6, rolling up and storing: the dried ultrafiltration membrane (11) is rolled up into a finished product through a rolling structure to complete the preparation of the ecological antibacterial high-stability PES ultrafiltration membrane.

Images