A laboratory ultrafiltration membrane casting liquid preparation equipment

Abstract

The utility model relates to a laboratory ultrafiltration membrane casting liquid preparation device, which belongs to the field of ultrafiltration membrane preparation technology and solves the problems of low quality and uneven quality of ultrafiltration membrane preparation in the prior art. The utility model includes a shell, a heating component, a stirring component, a vacuum component and a beaker; the heating component is used to heat the casting liquid, including a heater and a resistance wire; the heater is a square frame structure with an opening at the bottom, which is covered on the upper part of the workbench; the stirring component is used to stir the casting liquid, including a magnet, a stirring drive device, a DC brushless motor and a magnet; the magnet is placed in the beaker; the vacuum component is used to evacuate the inside of the equipment to avoid bubbles during the stirring of the casting liquid; a glass rod is fixed in the center of the bottom of the beaker, and the lower part of the glass rod passes through the center of the magnet to keep the magnet moving along the central axis of the beaker; the magnet can rotate around the axis of the glass rod. The utility model can achieve high quality of the prepared casting membrane and good consistency of membrane flux.

Description

Technical Field

[0001] The utility model relates to the technical field of ultrafiltration membrane preparation, in particular to an ultrafiltration membrane casting liquid preparation device for laboratory use. Background Art

[0002] In the field of membrane water treatment, non-solvent induced phase inversion is widely used in the production of various ultrafiltration membranes. The main membrane material and pore-forming agent are evenly dispersed in an organic solvent, and then the membrane is scraped into a uniform and smooth membrane by a scraper after standing and degassing. Finally, the membrane is placed in a non-organic solvent such as water, and after phase inversion, a membrane that can be used for water treatment is made.

[0003] Since supramolecular or macromolecular substances need to be introduced into the casting liquid, if the stirring is not uniform during the stirring process, the macromolecular substances will settle to the bottom of the container during the static degassing process, resulting in uneven density distribution of the casting liquid; since the stirring in the film making process is mostly direct stirring in the air, water vapor or other impurities in the air will enter the casting liquid, affecting the quality of the casting film. At the same time, the bubbles generated during the stirring process are also prone to form bubble defects in the casting film. In the casting process, the casting liquid is heated in a water bath. If the container containing the casting liquid is not tightly sealed, water vapor will enter the casting liquid, forming a small-scale phase transformation. The above situations will lead to uneven performance of the prepared ultrafiltration membrane, and the quality of the film cannot be guaranteed. Utility Model Content

[0004] In view of the above analysis, the utility model aims to provide a laboratory ultrafiltration membrane casting liquid preparation device to solve the problems of low casting quality and uneven membrane flux in the existing ultrafiltration membrane preparation.

[0005] The purpose of this utility model is mainly achieved through the following technical solutions:

[0006] A laboratory ultrafiltration membrane casting solution preparation device, comprising a housing, a heating component, a stirring component, a vacuum component and a beaker;

[0007] The heating assembly is used to heat the casting liquid, and includes a heater and a resistance wire; the heater is a square frame structure with an opening at the bottom, and is covered on the upper part of the workbench in the equipment;

[0008] The stirring assembly is used to stir the casting liquid, and includes a magnet, a stirring driving device, a brushless DC motor and a magnet; the magnet is placed in a beaker;

[0009] The vacuum component is used to evacuate the interior of the device to avoid bubbles from being generated during the stirring process of the casting liquid;

[0010] A glass rod is fixedly arranged at the center of the bottom of the beaker, and the lower part of the glass rod passes through the center of the magnet so as to keep the magnet moving along the central axis of the beaker; the magnet can rotate around the axis of the glass rod.

[0011] Furthermore, an iron sheet is provided at the bottom of the beaker, and the iron sheet is used to absorb the magnet.

[0012] Furthermore, the height of the heater is lower than the height of the top of the interior of the device.

[0013] Furthermore, the width of the heater is the same as the depth of the workbench.

[0014] Furthermore, two ends of the heater are fixed to the edges of the workbench.

[0015] Furthermore, the resistance wire is arranged below the workbench, corresponding to the position of the beaker.

[0016] Furthermore, the glass rod is provided with a limiting cylinder or a detachable limiting ring to prevent the magnet from sliding out of the glass rod when pouring the solution.

[0017] Furthermore, the diameter of the limiting cylinder is larger than the diameter of the glass rod and the aperture of the magnet.

[0018] Furthermore, the vacuum assembly includes a vacuum pipeline, a vacuum valve and an exhaust valve.

[0019] Furthermore, it also includes an air filter and a ventilation fan.

[0020] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0021] (1) Compared with the prior art which only uses the resistance wire at the bottom of the beaker for heating, the present invention is provided with a heater with a square frame structure covering the entire upper part of the workbench, so that the temperature in the entire device is consistent. At the same time, by adjusting the heating temperature of the heater and the resistance wire, the temperature of the solution in the beaker is consistent from top to bottom, thus avoiding the problem in the prior art that the solution in the beaker is only heated from the bottom, resulting in uneven temperature of the solution, too high temperature at the bottom of the beaker, insufficient temperature of the solution at the top of the beaker, and inconsistent quality of the generated ultrafiltration membrane.

[0022] (2) Compared with the magnetic stirring structure in the prior art, the utility model sets a glass rod fixed at the center of the bottom of the beaker, and punches a hole in the center of the magnet, through which the glass rod is passed, so that the magnet rotates on the central axis of the beaker without deviation, thereby ensuring the stirring effect.

[0023] (3) The utility model utilizes a dual structure of a limiting cylinder on a glass rod and an iron sheet attached to the bottom of a beaker to limit the magnet from being poured out. On the one hand, the magnet is not easily detached from the bottom area during stirring. On the other hand, when pouring the solution, the magnet will not cause a large shaking effect on the solution due to the outflow of the solution, thereby improving the forming quality of the ultrafiltration membrane.

[0024] (4) The utility model achieves uniform mixing of the casting liquid from top to bottom by stirring with a small amplitude, so as to prevent the supramolecular whole or macromolecular substance introduced into the casting liquid from settling to the bottom of the container due to its large mass, resulting in uneven density of the casting liquid; at the same time, the bubbles generated during stirring are removed by vacuuming in real time, thereby avoiding bubble defects in ultrafiltration membrane formation and improving the ultrafiltration membrane formation quality.

[0025] (5) As long as the parameters (temperature, stirring amplitude, vacuum degree) are set the same each time, the casting liquid prepared by the equipment provided by the utility model is uniform. The laboratory ultrafiltration membrane casting liquid preparation equipment provided by the utility model integrates stirring, heating and vacuuming, saves casting time and improves ultrafiltration membrane forming efficiency.

[0026] In the present invention, the above-mentioned technical solutions can also be combined with each other to achieve more preferred combination solutions. Other features and advantages of the present invention will be described in the following content, and some advantages can be obvious from the description or understood by implementing the present invention. The purpose and other advantages of the present invention can be achieved and obtained through the contents specifically pointed out in the text and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings are only used for the purpose of illustrating specific embodiments and are not to be considered as limiting the present invention. In the entire drawings, the same reference symbols represent the same components.

[0028] Figure 1 It is a diagram showing the internal structure of a laboratory ultrafiltration membrane casting solution preparation device according to a specific embodiment;

[0029] Figure 2 It is an external structural diagram of a laboratory ultrafiltration membrane casting solution preparation device according to a specific embodiment;

[0030] Figure 3 It is a schematic diagram of the beaker structure of a specific embodiment.

[0031] Reference numerals:

[0032] 1-housing, 2-heating component, 201-heater, 202-resistance wire, 3-stirring component, 301-magnet, 302-stirring drive device, 303-DC brushless motor, 304-magnet, 4-vacuum component, 401-vacuum pipe, 402-vacuum gauge, 403-vacuum valve and exhaust valve, 5-beaker, 501-glass rod, 502-iron sheet, 6-air filter, 7-ventilation fan, 8-control power supply, 9-electronic control board, 10-main power switch, 11-equipment door, 12-equipment door handle, 13-observation window. DETAILED DESCRIPTION

[0033] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.

[0034] A specific embodiment of the utility model is as follows Figure 1 and Figure 2 As shown, a laboratory ultrafiltration membrane casting liquid preparation device is disclosed, which includes a housing 1, a heating component 2, a stirring component 3, a vacuum component 4 and a beaker 5.

[0035] The heating component 2 is used to heat the casting liquid, and includes a heater 201 and a resistance wire 202 .

[0036] In view of the problem that only the bottom of the beaker 5 is heated in the prior art, so that the solution in the beaker 5 is heated unevenly, the present embodiment is provided with a heater 201 at the upper part of the workbench and a resistance wire 202 at the lower part of the workbench for simultaneous heating. In order to make the temperature inside the equipment uniform, the heater 201 is designed as a square frame structure with an opening at the lower part, covering the entire upper part of the workbench. It should be noted that in order to make the heating range of the heater 201 cover the entire working area and make the temperature of the entire working area consistent, the two ends of the heater 201 are fixed to the edge of the workbench, the height of the heater 201 is slightly lower than the height of the top of the equipment, and the width of the heater 201 is the same as the depth of the workbench. The resistance wire 202 is arranged below the workbench, corresponding to the beaker 5 station, and is used for directly heating the solution in the beaker 5 at the lower part.

[0037] Compared with the heating structure of the prior art that only heats the lower part of the beaker 5, the present embodiment is provided with a heater 201 of a square frame structure covering the entire upper part of the workbench, and the temperature in the entire device is consistent. At the same time, by adjusting the heating temperature of the heater 201 and the resistance wire 202, the temperature of the solution in the beaker 5 is made consistent from top to bottom, thus avoiding the problem that the solution in the beaker 5 is only heated from the bottom in the prior art, resulting in uneven temperature of the solution, too high temperature at the bottom of the beaker 5, and insufficient temperature of the solution at the upper part of the beaker 5, thereby causing the problem of inconsistent quality of the generated casting solution.

[0038] The stirring assembly 3 is used to stir the casting solution in the beaker 5 so that the main components of the ultrafiltration membrane and the pore-forming agent solution are mixed uniformly. The stirring assembly 3 uses a magnetic stirring structure, including a magnet 301, a stirring drive device 302, a DC brushless motor 303 and a magnet 304.

[0039] The magnet 301, the stirring driving device 302, and the DC brushless motor 303 are sequentially arranged below the heating resistance wire 202. The magnet 301 is used to generate a magnetic field, and under the action of the stirring driving device 302 and the DC brushless motor 303, the magnet 304 in the beaker 5 is driven to move. The magnet 304 is placed in the beaker 5, and stirs the solution by circular motion in the solution, so that the solution in the beaker 5 is stirred evenly.

[0040] The vacuum assembly 4 includes a vacuum pipe 401, a vacuum gauge 402, a vacuum valve and an exhaust valve 403. The vacuum assembly 4 is used to evacuate the interior of the device, reduce the bubble problem of the solution being stirred and heated in the air, and avoid bubble defects when the ultrafiltration membrane is formed. At the same time, by evacuating the device, impurities can be prevented from entering the casting liquid to cause a small-scale phase conversion, so that the casting film quality is uniform. The vacuum gauge 402 is used to display the vacuum value in the device, and the vacuum valve and the exhaust valve are used for evacuating the solution when it is first placed in the device and exhausting the solution in the device when it needs to be taken out.

[0041] Furthermore, a plurality of beaker 5 positions are arranged on the workbench in the equipment, and the beaker 5 is placed on the beaker 5 position on the workbench in the equipment during operation. Figure 3 As shown, the magnet 304 is placed in the center of the bottom of the beaker 5. Considering that the magnet 304 may deviate from the center during stirring and cannot play a role in uniform stirring, if the magnet 304 is not taken out when the solution in the beaker 5 needs to be poured out, the magnet 304 will flow out with the solution and affect the quality of the casting film; taking out the magnet 304 will cause the solution to shake and induce bubbles; a glass rod 501 is set in the beaker 5, and the glass rod 501 is fixed in the center of the bottom of the beaker 5 and passes through the center of the magnet 304 to ensure that the magnet 304 can make a circular motion around the axis of the glass rod 501. Further, a limiting cylinder is set at the position near the magnet 304 at the lower part of the glass rod 501, and the diameter of the cylinder is greater than the diameter of the glass rod 501, which is used to prevent the rotor from sliding out of the glass rod 501. In this embodiment, the limiting cylinder and the glass rod 501 are an integrated structure. Considering the replacement of the magnet 304, as an alternative to this embodiment, the limiting cylinder can also be set as a detachable limiting ring. Furthermore, an iron sheet 502 is pasted on the bottom surface of the beaker 5 to attract the magnetic particles 304 when the solution is poured, so that the magnetic particles 304 do not leave the bottom of the beaker 5.

[0042] Compared with the magnetic stirring structure in the prior art, the present embodiment sets a glass rod 501 fixed at the center of the bottom of the beaker 5, and punches a hole in the center of the magnet 304 to pass the glass rod 501, so that the magnet 304 rotates on the central axis of the beaker 5 without deviation, thereby ensuring the stirring effect.

[0043] This embodiment utilizes a dual structure of a limiting cylinder or a detachable limiting ring on the glass rod 501 and an iron sheet 502 attached to the bottom of the beaker 5 to limit the magnet 304 from being poured out. On the one hand, it makes it difficult for the magnet 304 to escape from the bottom area during stirring. On the other hand, when pouring the solution, the magnet 304 will not cause a large shaking effect on the solution as it flows out with the solution, thereby improving the forming quality of the cast film.

[0044] Furthermore, air filters 6 and ventilation fans 7 are provided on both sides of the bottom of the device to assist in removing impurity gases in the device and dissipating heat. A control power supply 8 is located below the brushless DC motor 303 in the stirring device and is used to control the stirring assembly 3 and the heating assembly 2.

[0045] Furthermore, an electronic control panel 9, a main power switch 10, an equipment door 11, an equipment door handle 12 and a transparent glass observation window 13 are also provided on the external panel of the equipment.

[0046] The electronic control panel 9 is used to display the vacuum value, set and display the heating temperature of the heater and the resistance wire, and the stirring speed.

[0047] The main power switch 10, the device door 11, the device door handle 12 and the observation window 13 are all prior art and will not be described in detail here.

[0048] The above is an embodiment of the utility model. The specific method of using the utility model is as follows:

[0049] Place the ingredients for preparing the ultrafiltration membrane in the beaker 5 in proportion, open the equipment door 11, and place the beaker 5 in the equipment. Turn on the power switch of the equipment, set the heating temperature and stirring rate of the heater 201 and the resistance wire 202; at this time, the temperature of the solution in the beaker 5 inside the equipment is consistent, and the solution in each beaker 5 is also consistent. Driven by magnetic force, the rotor stirs slightly in the solution. Open the vacuum valve and evacuate the inside of the equipment; observe the reading of the vacuum gauge 402 on the equipment panel; in a vacuum environment, the bubbles generated by stirring in the solution are pumped away by the vacuum pump. After the set time, stop the operation of the heating component 2 and the stirring component 3. Close the vacuum valve, open the vent valve, and deflate the equipment. Lower the temperature inside the equipment to the set temperature. Take out the beaker 5, and pour the casting liquid in the beaker 5 onto the fine glass plate for film formation.

[0050] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed in the present invention should be included in the protection scope of the present invention.

Claims

1. A laboratory ultrafiltration membrane casting liquid preparation device, characterized in that: It comprises a housing (1), a heating component (2), a stirring component (3), a vacuum component (4) and a beaker (5); The heating component (2) is used to heat the casting liquid, and comprises a heater (201) and a resistance wire (202); the heater (201) is a square frame structure with an opening at the bottom, and is covered on the upper part of the workbench in the equipment; The stirring assembly (3) is used to stir the casting liquid, and comprises a magnet (301), a stirring driving device (302), a brushless DC motor (303) and a magnet (304); the magnet (304) is placed in the beaker (5); The vacuum component (4) is used to evacuate the interior of the device to avoid bubbles being generated during the stirring process of the casting liquid; A glass rod (501) is fixedly arranged at the center of the bottom of the beaker (5), and the lower part of the glass rod (501) passes through the center of the magnet (304) to keep the magnet (304) moving along the central axis of the beaker (5); the magnet (304) can rotate around the axis of the glass rod (501).

2. The laboratory ultrafiltration membrane casting solution preparation equipment according to claim 1, characterized in that: An iron sheet (502) is provided at the bottom of the beaker (5), and the iron sheet (502) is used to absorb the magnet (304).

3. The laboratory ultrafiltration membrane casting solution preparation equipment according to claim 1, characterized in that: The height of the heater (201) is lower than the height of the top of the interior of the device.

4. The laboratory ultrafiltration membrane casting solution preparation equipment according to claim 3, characterized in that: The width of the heater (201) is the same as the depth of the workbench.

5. The laboratory ultrafiltration membrane casting solution preparation equipment according to claim 4, characterized in that: Both ends of the heater (201) are fixed to the edges of the workbench.

6. The laboratory ultrafiltration membrane casting solution preparation equipment according to claim 1, characterized in that: The resistance wire (202) is arranged below the workbench, corresponding to the position of the beaker (5).

7. The laboratory ultrafiltration membrane casting solution preparation equipment according to claim 1, characterized in that: The glass rod (501) is provided with a limiting cylinder or a detachable limiting ring, which is used to prevent the magnet (304) from sliding out of the glass rod (501) when pouring the solution.

8. The laboratory ultrafiltration membrane casting solution preparation equipment according to claim 7, characterized in that: The diameter of the limiting cylinder is larger than the diameter of the glass rod (501) and the aperture of the magneton (304).

9. The laboratory ultrafiltration membrane casting solution preparation equipment according to claim 1, characterized in that: The vacuum component (4) comprises a vacuum pipeline (401), a vacuum valve and an exhaust valve (403).

10. The laboratory ultrafiltration membrane casting solution preparation equipment according to any one of claims 1 to 9, characterized in that: It also includes an air filter (6) and a ventilation fan (7).

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