Efficient PVDF (Polyvinylidene Fluoride) hollow fiber microporous membrane preparation device

Abstract

The efficient PVDF hollow fiber microporous membrane preparation device comprises a tank body and a stirring assembly, a stirring mechanism is installed on the tank body, and the efficient PVDF hollow fiber microporous membrane preparation device is characterized in that the tank body is installed in a heating tank in an embedded mode, the heating tank is connected with a temperature control assembly, a dispersing assembly is arranged on the stirring mechanism, a cleaning assembly is arranged in the tank body, and the cleaning assembly is connected with the stirring mechanism. According to the utility model, the dispersing plate with the conical structure is arranged below the feeding pipe in the tank, and is arranged on the stirring rod, so that when materials at the feeding hole fall onto the dispersing plate for construction, the materials are dispersed along the inclined surface of the dispersing plate and fall into a solvent below from the leaking holes formed in the dispersing plate, and the materials are uniformly dispersed; therefore, the materials are fed in a dispersed and uniform manner, and the material uniform mixing effect is enhanced; by additionally arranging the cleaning assembly, the tank body can be conveniently cleaned after preparation, and by additionally arranging the temperature control assembly, the temperature required by stirring is accurately controlled, so that the preparation effect of the membrane casting liquid is improved.

Description

Technical Field

[0001] This utility model relates to the technical field of stirring equipment for preparing PVDF hollow fiber microporous membranes, and particularly to a high-efficiency PVDF hollow fiber microporous membrane preparation device. Background Technology

[0002] PVDF (polyvinylidene fluoride) hollow fiber microporous membranes have the characteristics of chemical corrosion resistance, oxidation resistance, good mechanical properties and thermal stability, so they have a wide range of applications. For example, in the field of water treatment, they are used to purify drinking water, and in sewage treatment or seawater desalination, they are used to remove impurities and filter impurities. In the field of gas separation, they are used to separate different gases, and they are also used in the biomedical field.

[0003] The preparation process of PVDF (polyvinylidene fluoride) hollow fiber microporous membranes mainly includes the following steps: The first step is to prepare the polymer solution, which requires mixing PVDF polymer particles with a suitable solvent (such as N,N-dimethylacetamide, N-methylpyrrolidone, etc.) in a certain proportion, heating and stirring to fully dissolve and form a uniform casting solution. This step is crucial in determining the microporous membrane. The second step is to prepare the core solution, which is usually an immiscible liquid with the casting solution. The casting solution and core solution are then transported to the spinning nozzle for extrusion molding. The third step is to immerse the extruded hollow liquid in a coagulation bath for solidification, forming a hollow fiber microporous membrane with a certain pore structure and mechanical properties. The final step is to wash and dry the solidified hollow fiber membrane.

[0004] In the above-mentioned process of preparing VDF hollow fiber microporous membranes, the casting solution is mixed in a stirred tank. Currently, when PVDF polymer particles are added to the stirred tank, they are all added directly to the solvent inside the tank at once. The resulting air bubbles will coat some of the powder, forming lumps. This results in low uniformity of the casting solution, affecting the quality of the prepared microporous membrane. Moreover, the stirred tanks used now are not easy to clean after each casting solution preparation. Temperature control is also very important during the casting solution preparation process, but the current mixing process lacks temperature control adjustment function. If the temperature is too low, the PVDF polymer molecular chains will have weak mobility and slow interaction with solvent molecules, leading to incomplete dissolution. Undissolved polymer particles may be present in the casting solution, which will worsen the uniformity of the casting solution, causing defects during film formation and affecting the membrane's pore size distribution and porosity. If the temperature is too high, the molecular thermal motion will intensify, the intermolecular forces in the casting solution will weaken, the viscosity will decrease, and problems such as fiber breakage and uneven fiber thickness will easily occur. Therefore, in order to solve these problems, an efficient PVDF hollow fiber microporous membrane preparation device was designed. Utility Model Content

[0005] In view of the above-mentioned technical problems, this utility model provides a high-efficiency PVDF hollow fiber microporous membrane preparation device. It not only adds a temperature control component to accurately control the temperature required for stirring to improve the preparation effect of the casting liquid, but also sets a dispersion plate to effectively disperse the PVDF polymer particles and enhance the mixing effect.

[0006] To achieve the above objectives, the technical solution of this utility model is as follows:

[0007] A high-efficiency PVDF hollow fiber microporous membrane preparation device includes a tank and a stirring assembly. The stirring mechanism is mounted on the tank. The device is characterized in that the tank is embedded within a heating tank, which is connected to a temperature control assembly. A dispersion assembly is mounted on the stirring mechanism, and a cleaning assembly is provided inside the tank.

[0008] The stirring mechanism consists of a stirring motor and a stirring rod. The stirring motor is installed at the bottom of the tank, and the output end of the stirring motor is connected to the stirring rod.

[0009] The dispersing assembly consists of a dispersing plate and connecting rods. The dispersing plate is configured as a cone shape and has leakage holes arranged at certain intervals from the center to the periphery. Multiple connecting rods are provided above the dispersing plate, and the dispersing plate is spliced ​​together as a whole through the connecting rods. The dispersing plate is fixed to the end of the stirring rod by bolts.

[0010] Furthermore, the top of the tank is provided with a feed inlet and a feed pipe is installed at the feed inlet via a flange. The feed pipe extends into the tank and is located above the dispersing plate.

[0011] The cleaning assembly includes an annular spray plate, nozzles, and a mounting bracket. The annular spray plate is mounted at the top of the tank interior via the mounting bracket, and multiple nozzles are mounted below the annular spray plate.

[0012] Furthermore, the annular spray plate is connected to an external water supply device via a pipe, and water is supplied to the annular spray plate through the external water supply device to spray and clean the inside of the tank.

[0013] The temperature control component includes a heating water tank, a circulation pump, water pipes, and a temperature sensor. The temperature sensor is installed inside the tank to monitor the temperature inside the tank. The outlet of the heating water tank is connected to the inlet of the heating tank through the circulation pump and water pipes. The outlet of the heating tank is connected to the return outlet of the heating water tank through water pipes.

[0014] Furthermore, the heating water tank is equipped with an electric heating wire for heating the water inside the tank.

[0015] Furthermore, the outer wall of the heating tank is provided with heat insulation material, which serves to insulate heat and reduce heat loss.

[0016] Furthermore, a controller is installed on the outer wall of the heating tank. The controller is electrically connected to the electric heating wire and temperature sensor in the heating water tank, respectively, so as to realize the real-time control of the heating power of the electric heating wire by monitoring the temperature inside the tank through the temperature sensor, and accurately control the temperature required for stirring.

[0017] Furthermore, the bottom of the tank is provided with a drain outlet and a liquid outlet, and control valves are installed at both the drain outlet and the liquid outlet to control the draining and liquid discharge.

[0018] Furthermore, a liquid inlet is provided on one side of the tank for conveying solvent mixed with PVDF polymer particles into the tank.

[0019] Furthermore, the tank is equipped with a viewing window to facilitate viewing the contents of the tank.

[0020] The beneficial effects of this utility model are:

[0021] This invention features a cone-shaped dispersing plate installed below the feed pipe inside the tank. The dispersing plate is mounted on a stirring rod. When material at the feed inlet falls onto the dispersing plate, it is dispersed along the inclined surface of the dispersing plate and falls into the solvent below through the leakage holes on the dispersing plate, thereby achieving uniform feeding of the material and enhancing the mixing effect.

[0022] This utility model installs a cleaning component on the top of the tank. After the casting liquid is prepared and discharged from the outlet, water is supplied to the spray plate and sprayed and rinsed inside the tank by the nozzle. It can also clean the residue on the stirring rod. The waste liquid after cleaning is discharged from the drain outlet, which greatly facilitates the cleaning operation of the tank.

[0023] The temperature control component designed in this utility model monitors the temperature inside the tank through a temperature sensor, and the controller controls the heating power of the electric heating wire in the heating water tank in real time, thereby controlling the temperature inside the heating tank. This allows for precise control of the temperature required during stirring, effectively preventing excessively high or low temperatures from affecting the uniformity or viscosity of the casting liquid. Attached Figure Description

[0024] Figure 1 This is a cross-sectional schematic diagram of the overall structure of the high-efficiency PVDF hollow fiber microporous membrane preparation device of this utility model;

[0025] Figure 2 This is a schematic diagram of section A of the high-efficiency PVDF hollow fiber microporous membrane preparation device of this utility model;

[0026] Figure 3This is a top view of the dispersion plate of the high-efficiency PVDF hollow fiber microporous membrane preparation device of this utility model;

[0027] Figure 4 This is a schematic diagram of the structure of the high-efficiency PVDF hollow fiber microporous membrane preparation device of this utility model;

[0028] As shown in the figure: 1. Tank body, 11. Inlet, 111. Inlet pipe, 12. Liquid inlet, 13. Liquid outlet, 14. Drain outlet, 15. Viewing window, 2. Heating tank, 21. Thermal insulation material, 22. Support frame, 31. Stirring motor, 32. Stirring rod, 4. Dispersion plate, 41. Leakage hole, 42. Connecting rod, 51. Annular spray plate, 52. Spray head, 61. Heating water tank, 62. Circulation pump, 63. Water pipe, 64. Temperature sensor, 65. Controller. Detailed Implementation

[0029] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0030] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0031] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0032] Example 1

[0033] As shown in the figure, the tank 1 is embedded in the heating tank 2, which is used to stir and heat the tank 1. The bottom of the heating tank 2 is fixed on the support frame 22. The outer wall of the heating tank 2 is provided with heat insulation material 22. The heat insulation material can be glass wool, polyurethane foam or other materials, which can play the role of heat insulation to reduce heat loss.

[0034] The heating tank 2 is connected to the heating water tank 61 in the temperature control component. The heating water tank 61 is equipped with an electric heating wire to heat the water inside. The outlet of the heating water tank 1 is connected to the inlet of the heating tank 2 through a circulation pump 62 and a water pipe 63. The outlet of the heating tank 2 is connected to the return outlet of the heating water tank 61 through a water pipe 63. The temperature sensor 64 in the temperature control component is installed inside the tank 1 to monitor the temperature inside the tank 1. The controller 65, which controls the heating power of the electric heating wire in the heating water tank 61, is installed on the outer wall of the heating tank 2. The controller 65 is electrically connected to the electric heating wire in the heating water tank 61 and the temperature sensor 64, respectively, so as to realize the real-time control of the heating power of the electric heating wire by monitoring the temperature inside the tank 1 through the temperature sensor 64, and accurately control the temperature required for stirring.

[0035] A stirring motor 31 is installed at the bottom of the tank body 1. The output end of the stirring motor 31 is connected to the stirring rod 32. The stirring rod 32 extends into the tank body 1 and is provided with a bearing and a sealing ring at the connection with the tank body 1.

[0036] like Figure 1 and 2 The dispersing plate 4 is fixed to the end of the stirring rod 32 by bolts. The dispersing plate 4 is configured with a conical structure and has leakage holes 41 arranged at certain intervals from the center to the periphery. Figure 3 Multiple connecting rods 42 are provided above the dispersing plate 4, and the dispersing plate 4 is spliced ​​together as a whole through the connecting rods 42. The top of the tank body 1 is provided with a feed port 11, and a feed pipe 111 is installed at the feed port 11 through a flange. The feed pipe 111 extends into the inside of the tank body 1 and is located above the dispersing plate 2, so that the PVDF polymer particles in the feed pipe 111 fall onto the dispersing plate 4.

[0037] An annular spray plate 51 is installed at the top of the tank 1 via a fixing bracket, and multiple spray nozzles 52 are installed below the annular spray plate 51. It should be noted that the annular spray plate 51 is connected to an external water supply device via a pipe, and water is supplied to the annular spray plate 51 through the external water supply device to spray and clean the inside of the tank.

[0038] like Figure 1The tank body 1 has an inlet 12 on one side of the upper end for conveying solvent mixed with PVDF polymer particles into the tank body 1. The tank body 1 also has a drain 14 and an outlet 13 at the bottom. Control valves are installed at both the drain 14 and the outlet 13 to control the drain and outlet conditions.

[0039] like Figure 4 A viewing window 15 is provided on the tank body 1 to facilitate viewing the condition inside the tank.

[0040] Example 2

[0041] In preparing the casting solution, this invention first delivers solvent mixed with PVDF polymer particles into the tank 1 through the inlet 12 on the tank 1. Then, the temperature control component is activated to deliver hot water into the inner cavity of the heating tank 2. The stirring temperature is controlled by the controller 65 and the temperature sensor 64 to ensure that the temperature remains constant during the stirring process.

[0042] PVDF polymer particles are fed into the tank 1 through the inlet 11 at the top. The material falls onto the dispersing plate 4 through the feed pipe 111. The dispersing plate 4 rotates together with the stirring rod 32. The material on the dispersing plate 4 is dispersed along the inclined surface of the dispersing plate 4 and falls into the solvent below through the leakage hole 41 on the dispersing plate 4. This achieves uniform feeding of the material and enhances the mixing effect. The prepared casting solution is discharged from the outlet 13 at the bottom for subsequent extrusion molding.

[0043] After the casting solution is prepared and discharged from the outlet 13, water is supplied to the annular spray plate 51 by activating the external water supply equipment. The spray nozzle 52 sprays and rinses the inside of the tank, which can also clean the residue on the stirring rod 32. The waste liquid after cleaning is discharged from the drain outlet 14, which greatly facilitates the cleaning operation of the tank 1.

[0044] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. The various components mentioned in this utility model are common technologies in the existing field. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A device for preparing high-performance PVDF hollow fiber microporous membranes, comprising a tank body and a stirring assembly, wherein a stirring mechanism is installed on the tank body, characterized in that, The tank body is embedded in the heating tank, the heating tank is connected to the temperature control component, the stirring mechanism is equipped with a dispersing component, and the tank body is equipped with a cleaning component.

2. The high efficiency PVDF hollow fiber microporous membrane preparation device according to claim 1, characterized in that The stirring mechanism consists of a stirring motor and a stirring rod. The stirring motor is installed at the bottom of the tank, and the output end of the stirring motor is connected to the stirring rod.

3. The apparatus for making high efficiency PVDF hollow fiber microporous membranes according to claim 2, wherein The dispersing assembly consists of a dispersing plate and connecting rods. The dispersing plate is configured as a cone shape and has leakage holes arranged at certain intervals from the center to the periphery. Multiple connecting rods are provided above the dispersing plate, and the dispersing plate is spliced ​​together as a whole through the connecting rods. The dispersing plate is fixed to the end of the stirring rod by bolts.

4. The high efficiency PVDF hollow fiber microporous membrane preparation device according to claim 1, characterized in that The cleaning assembly includes an annular spray plate, nozzles, and a mounting bracket. The annular spray plate is mounted at the top of the tank interior via the mounting bracket, and multiple nozzles are mounted below the annular spray plate.

5. The apparatus for making high efficiency PVDF hollow fiber microporous membranes according to claim 1, wherein The temperature control component includes a heating water tank, a circulation pump, water pipes, and a temperature sensor. The temperature sensor is installed inside the tank to monitor the temperature inside the tank. The outlet of the heating water tank is connected to the inlet of the heating tank through the circulation pump and water pipes. The outlet of the heating tank is connected to the return outlet of the heating water tank through water pipes.

6. The apparatus for making high efficiency PVDF hollow fiber microporous membranes according to claim 3, wherein The tank is provided with a feed inlet at the top and a feed pipe is installed at the feed inlet via a flange. The feed pipe extends into the tank and is located above the dispersion plate.

7. The apparatus for making high efficiency PVDF hollow fiber microporous membranes according to claim 5, wherein The outer wall of the heating tank is provided with heat insulation material.

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