Water-phase extrusion device for experimental coating of reverse osmosis composite membrane
By designing an experimentally coated aqueous phase extrusion device for reverse osmosis composite membrane, the excess water phase on the base film is removed by extrusion, the problem of uneven distribution of the aqueous phase is solved, and the uniform stability and performance improvement of the composite membrane is achieved.
Patent Information
- Application Number
- CN202421689313.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-17
- Publication Date
- 2025-06-06
- Estimated Expiration
- 2034-07-17
AI Technical Summary
When the existing reverse osmosis composite membrane experimental coating water phase extrusion device removes excess water phase on the base film, it is difficult to control the uniform distribution of the water phase, resulting in film surface defects and uneven performance.
A reverse osmosis composite film experimentally coated water phase extrusion device was designed to remove excess water phase on the base film by extrusion, control the extrusion pressure using the main roller cylinder pressure, adjust the retained amount of the water phase, and ensure the uniform distribution of the water phase on the base film.
The uniform stability of the composite film is achieved, the film surface defects are reduced, the performance and consistency of the composite film is improved, the operation is simplified and the equipment is improved.
Smart Images
Figure CN222943819U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of reverse osmosis membrane preparation, in particular to a reverse osmosis composite membrane experimental coating water phase extrusion device. Background Art
[0002] The reverse osmosis composite membrane experimental coating water phase extrusion device is a supporting device for the preparation of reverse osmosis membrane. At present, the composite reverse osmosis membrane is mainly prepared by interfacial polymerization. The interfacial polymerization method for preparing reverse osmosis composite membrane is to immerse the supporting base membrane in an aqueous solution containing polyamine monomers (hereinafter referred to as the aqueous phase), and then remove the excess aqueous phase solution on the supporting base membrane, and then contact the base membrane with another organic solvent containing polyacyl chloride monomers (hereinafter referred to as the organic phase) to carry out cross-sectional polymerization reaction. The polyamine and polyacyl chloride react on the surface of the supporting membrane and form a dense separation layer, and then heat treat, rinse and dry at a certain temperature to obtain the finished composite reverse osmosis membrane. The main factors affecting the performance of the composite reverse osmosis membrane are the properties of the supporting membrane, the polymerization reaction conditions and the post-treatment process.
[0003] During the polymerization reaction, the concentrations of the two monomers and the amount of monomers involved in the reaction have a great influence on the performance of the composite membrane. At present, the aqueous phase of the composite membrane is often prepared by dip coating. During the dip coating process, the amount of aqueous phase monomers carried by the supporting base membrane is difficult to control. Often, part of the excess aqueous phase solution will flow back to the aqueous phase storage tank along the surface of the base membrane, and a part of the excess aqueous phase that cannot flow away in time needs to be removed in time to avoid affecting the subsequent polymerization reaction. The most commonly used method is air knife blowing. The air knife is difficult to control during the removal process, which can easily cause uneven distribution of aqueous phase monomers and cause membrane surface defects. The more evenly the aqueous phase monomers are distributed on the membrane surface, the fewer surface defects of the composite membrane obtained, and the combination of the separation layer and the support layer is stronger.
[0004] The existing reverse osmosis composite membrane experimental coating water phase extrusion device has certain drawbacks when used. In the reverse osmosis membrane preparation process, the composite membrane is usually prepared by interfacial polymerization reaction of polyamines and polyacyl chlorides on a pre-coated polysulfone base membrane. Before the interfacial polymerization reaction, the base membrane needs to be dipped in an aqueous phase (polyamine) solution. The uniformity of the distribution of the aqueous phase on the base membrane and the amount of storage are directly related to the structure and performance of the composite membrane. After dipping, the excess aqueous phase on the surface of the base membrane needs to be removed. If it is not removed, it will affect the next reaction, making the composite membrane performance uneven or even defective, which brings certain adverse effects to the actual use process. For this reason, we propose a reverse osmosis composite membrane experimental coating water phase extrusion device. Utility Model Content
[0005] Technical problem solved: In view of the shortcomings of the prior art, the utility model provides a reverse osmosis composite membrane experimental coating water phase extrusion device, which removes excess water phase on the base membrane by extrusion. The device can control the extrusion force by controlling the main roller cylinder pressure to adjust the retention amount of the water phase on the base membrane. This method controls the uniform distribution of the simple water phase on the base membrane, and the obtained composite membrane is uniform and stable with few membrane surface defects, so that the obtained composite membrane has excellent performance and consistency, which can effectively solve the problems in the background technology.
[0006] Technical solution: To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a reverse osmosis composite membrane experimental coating water phase extrusion device, including a bracket and a control system, an active roller and a driven roller are movably arranged in the middle of the inner side of the bracket, the active roller is located above the driven roller, a cylinder is positioned and installed on the inner side of one side of the bracket, a bearing seat is positioned at the bottom of the cylinder, a liquid receiving pan is positioned on the inner side of the bracket below the driven roller, a servo motor and a meter are installed on the outer side of the other side of the bracket, the servo motor is located at the end of the active roller, and the meter is located at the end of the driven roller.
[0007] Preferably, a base is integrally positioned at the bottom of the bracket, a pull rod is positioned and installed at an outer position on the inner side of the bracket, a rubber layer is positioned on the surface of the active roller, a driving gear is provided at the end of the active roller, a driven gear is provided at the end of the driven roller, a bearing plate is positioned at the bottom of the bearing seat, the driving gear is located at the position of the bearing plate, and a limiter is positioned between the bracket and the pull rod.
[0008] Preferably, the liquid receiving tray is fixed between two groups of brackets by bolts, and the driven roller is fixed on the brackets and bearings are provided at both ends thereof.
[0009] Preferably, the cylinder is connected to the bearing seat, both ends of the active roller are connected to the bearing sleeve, a driving gear is arranged at one end of the active roller and a servo motor is arranged at the other end to be connected to the central axis of the active roller, and a "U"-shaped hole is opened on the bracket to provide space for the active roller to move up and down.
[0010] Preferably, the meter counter and the servo motor are electrically connected to the control system, and the cylinder is connected to the control system via an air pipe.
[0011] Preferably, the bracket is connected to the base by bolts, and the two groups of brackets are connected and fixed by a pull rod.
[0012] Beneficial effects: Compared with the prior art, the utility model provides a reverse osmosis composite membrane experimental coating water phase extrusion device, which has the following beneficial effects: the reverse osmosis composite membrane experimental coating water phase extrusion device removes excess water phase on the base membrane by extrusion. The device can control the extrusion force by controlling the main roller cylinder pressure to adjust the retention amount of the water phase on the base membrane. The method controls the uniform distribution of the simple water phase on the base membrane, and the prepared composite membrane is uniform and stable with few membrane surface defects, so that the obtained composite membrane has excellent performance and consistency. The monomer carrying amount after the supporting base membrane is dipped in water phase can be accurately controlled, the membrane surface defects generated in the polymerization reaction process can be reduced, and the uniformity of the reverse osmosis composite membrane can be improved. The entire reverse osmosis composite membrane experimental coating water phase extrusion device has a simple structure and is easy to operate, and the effect of use is better than that of the traditional method. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 The utility model is a schematic diagram of the overall structure of a reverse osmosis composite membrane experimental coating water phase extrusion device.
[0014] Figure 2 The utility model is a schematic diagram of the structure of the driving roller and the driven roller in a reverse osmosis composite membrane experimental coating water phase extrusion device.
[0015] Figure 3 It is a structural schematic diagram of a side view of a reverse osmosis composite membrane experimental coating water phase extrusion device of the utility model.
[0016] In the figure: 1. Active roller; 2. Driven roller; 3. Rubber coating; 4. Servo motor; 5. Cylinder; 6. Tie rod; 7. Bearing seat; 8. Active gear; 9. Driven gear; 10. Base; 11. Liquid collecting tray; 12. Bracket; 13. Meter; 14. Control system; 15. Limiter; 16. Bearing plate. DETAILED DESCRIPTION
[0017] The technical solution of the utility model will be clearly and completely described below in conjunction with the accompanying drawings and specific embodiments, but those skilled in the art will understand that the embodiments described below are part of the embodiments of the utility model, rather than all of the embodiments, and are only used to illustrate the utility model, and should not be considered as limiting the scope of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the utility model. If the specific conditions are not specified in the embodiments, they are carried out according to conventional conditions or conditions recommended by the manufacturer. If the manufacturer is not specified for the reagents or instruments used, they are all conventional products that can be purchased commercially.
[0018] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.
[0019] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0020] like Figure 1-3 As shown, a reverse osmosis composite membrane experimental coating water phase extrusion device includes a bracket 12 and a control system 14, an active roller 1 and a driven roller 2 are movably arranged in the middle of the inner side of the bracket 12, the active roller 1 is located above the driven roller 2, a cylinder 5 is positioned and installed on the inner side of one side of the bracket 12, a bearing seat 7 is positioned at the bottom of the cylinder 5, a liquid receiving tray 11 is positioned on the inner side of the bracket 12 below the driven roller 2, a servo motor 4 and a meter 13 are installed on the outer side of the other side of the bracket 12, the servo motor 4 is located at the end of the active roller 1, and the meter 13 is located at the end of the driven roller 2, and the excess water phase on the base membrane is removed by extrusion. The device can control the extrusion force by controlling the main roller cylinder pressure to adjust the retention amount of the water phase retained on the base membrane. The method controls the uniform distribution of the simple water phase on the base membrane, and the obtained composite membrane is uniform and stable with few membrane surface defects, so that the obtained composite membrane has excellent performance and consistency.
[0021] Furthermore, a base 10 is integrally positioned at the bottom of the bracket 12, a tie rod 6 is positioned and installed at an outer position on the inner side of the bracket 12, a rubber layer 3 is positioned on the surface of the active roller 1, a driving gear 8 is provided at the end of the active roller 1, a driven gear 9 is provided at the end of the driven roller 2, a bearing plate 16 is positioned at the bottom of the bearing seat 7, the driving gear 8 is located at the position of the bearing plate 16, and a limiter 15 is positioned between the bracket 12 and the tie rod 6.
[0022] Furthermore, the liquid receiving tray 11 is fixed between the two groups of brackets 12 by bolts, and the driven roller 2 is fixed on the brackets 12 and bearings are provided at both ends thereof.
[0023] Furthermore, the cylinder 5 is connected to the bearing seat 7, both ends of the active roller 1 are connected to the bearing sleeve, a driving gear 8 is arranged at one end of the active roller 1 and a servo motor 4 is arranged at the other end to be connected to the central axis of the active roller 1, and a "U"-shaped hole is opened on the bracket 12 to provide space for the active roller 1 to move up and down.
[0024] Furthermore, the meter meter 13 and the servo motor 4 are electrically connected to the control system 14, and the cylinder 5 is connected to the control system 14 through an air pipe.
[0025] Furthermore, the bracket 12 is connected to the base 10 by bolts, and the two groups of brackets 12 are connected and fixed by a tie rod 6.
[0026] Example:
[0027] 1. Take two polysulfone-based membranes of the same size for coating test, immerse the two base membranes in the aqueous monomer solution at the same time, take out one and use an air knife to blow away excess water phase, and use the device to squeeze the other to remove excess water phase, then coat the two membranes immersed in the water phase with polyacid chloride to prepare a composite membrane, rinse and dry the prepared composite membrane to obtain a finished composite membrane. The whole process is the same except that the water phase removal method is different and other conditions are the same.
[0028] 2. Divide the two prepared diaphragms into 5 strips longitudinally and number them 1, 2, 3, 4, and 5 respectively. The one blown by air knife is sample 1, and the one extruded is sample 2. Then install the five diaphragms in sequence on the diaphragm testing device for performance testing.
[0029]
[0030] Test conditions: 2000ppm sodium chloride, 225psi, 25℃, PH=7.8-8.0, pre-press for 60min and then test for 30min, record the data.
[0031] From the test data, it can be seen that the desalination rate and flux of the reverse osmosis membrane prepared by extrusion are relatively uniform and stable at different positions, while the desalination rate and flux of the membrane prepared by air knife blowing are unstable and fluctuate greatly.
[0032] Working principle: The utility model includes an active roller 1, a driven roller 2, a rubber layer 3, a servo motor 4, a cylinder 5, a pull rod 6, a bearing seat 7, a driving gear 8, a driven gear 9, a base 10, a liquid receiving tray 11, a bracket 12, a meter 13, a control system 14, a limiter 15, and a bearing plate 16. The bottom is provided with a base 10, the bracket 12 is connected to the base 10 by bolts, the liquid receiving tray 11 is fixed between the two brackets 12, the brackets 12 are connected and fixed by railings 6, and the driven roller 2 is fixed on the bracket Bearings are arranged at both ends of the frame 12, a driven gear 9 is arranged at one end of the driven roller, and a meter 13 is arranged at the other end. A driving roller 1 is arranged above the driven roller 2, and a cylinder 5 is arranged at both ends of the driving roller 1. The cylinder 5 is connected to the bearing 7. The two ends of the main roller 1 are connected to the bearing sleeve. A driving gear 8 is arranged at one end of the main roller 1, and a servo motor is arranged at the other end to connect with the central axis of the main roller 1. A "U"-shaped hole is opened on the bracket 12 to provide space for the up and down movement of the main roller 1. The outer layer of the main roller is provided with a rubber layer 3. The meter 13 and The servo motor 4 is electrically connected to the control system 14, and the cylinder 5 is connected to the control system 14 through an air pipe. When working, the active roller 1 is pressed down by the cylinder to contact the driven roller 2. The driven roller 2 is equipped with a meter 13 to monitor the rotation speed in real time. The cylinder pressure is 0.1-0.5 bar. The extrusion force is controlled by adjusting the cylinder pressure, and then the active gear 8 and the driven gear 9 are meshed to make the two rollers rotate at the same speed under the drive of the servo motor 4. When the reverse osmosis composite membrane is made, the base membrane dipped in water phase is passed through the gap between the two rollers by adjusting the pressure of the cylinder 5 to control the extrusion force to remove excess water phase solution. The excess water phase solution flows to the liquid receiving tray 11 and is guided away. The excess water phase on the base membrane is removed by extrusion. The device can control the extrusion force by controlling the cylinder pressure of the main roller to adjust the retention amount of the water phase retained on the base membrane. This method controls the uniform distribution of the simple water phase on the base membrane, and the obtained composite membrane is uniform and stable with few defects on the membrane surface, so that the obtained composite membrane has excellent performance and consistency.
[0033] It should be noted that, in this article, relational terms such as first and second (number one, number two), etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "including one..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.
[0034] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. The technicians in this industry should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model will have various changes and improvements, and these changes and improvements fall within the scope of the utility model to be protected.
Claims
1. A reverse osmosis composite membrane experimental coating water phase extrusion device, comprising a support (12) and a control system (14), characterized in that: An active roller (1) and a driven roller (2) are movably arranged in the middle of the inner side of the bracket (12); the active roller (1) is located above the driven roller (2); a cylinder (5) is positioned and installed on the inner side of one side of the bracket (12); a bearing seat (7) is positioned at the bottom of the cylinder (5); a liquid receiving tray (11) is positioned on the inner side of the bracket (12) below the driven roller (2); a servo motor (4) and a meter (13) are installed on the outer side of the other side of the bracket (12); the servo motor (4) is located at the end of the active roller (1), and the meter (13) is located at the end of the driven roller (2).
2. A reverse osmosis composite membrane experimental coating water phase extrusion device according to claim 1, characterized in that: The bottom of the bracket (12) is integrally positioned with a base (10), a pull rod (6) is positioned and installed at an outer position on the inner side of the bracket (12), a rubber coating (3) is positioned on the surface of the active roller (1), a driving gear (8) is provided at the end of the active roller (1), a driven gear (9) is provided at the end of the driven roller (2), a bearing plate (16) is positioned at the bottom of the bearing seat (7), the driving gear (8) is located at the position of the bearing plate (16), and a limiter (15) is positioned between the bracket (12) and the pull rod (6).
3. A reverse osmosis composite membrane experimental coating water phase extrusion device according to claim 1, characterized in that: The liquid receiving tray (11) is fixed between two groups of brackets (12) by means of bolts, and the driven roller (2) is fixed on the brackets (12) and bearings are arranged at both ends thereof.
4. A reverse osmosis composite membrane experimental coating water phase extrusion device according to claim 1, characterized in that: The cylinder (5) is connected to the bearing seat (7), and the two ends of the active roller (1) are connected to the bearing sleeve. A driving gear (8) is arranged at one end of the active roller (1) and a servo motor (4) is arranged at the other end to be connected to the central axis of the active roller (1), and a "U"-shaped hole is opened on the bracket (12) to provide space for the active roller (1) to move up and down.
5. The reverse osmosis composite membrane experimental coating water phase extrusion device according to claim 1, characterized in that: The meter counter (13) and the servo motor (4) are electrically connected to a control system (14), and the cylinder (5) is connected to the control system (14) via an air pipe.
6. A reverse osmosis composite membrane experimental coating water phase extrusion device according to claim 2, characterized in that: The bracket (12) and the base (10) are connected by bolts, and the two groups of brackets (12) are connected and fixed by a pull rod (6).