Fluorine-containing polyamide composite nanofiltration membrane preparation device

Abstract

The utility model relates to the technical field of nanofiltration membrane preparation, in particular to a fluorine-containing polyamide composite nanofiltration membrane preparation device which comprises a stirring tank, a motor, a connecting shaft and stirring blades, a feeding pipe and a discharging pipe are arranged on the stirring tank; the stirring tank is fixedly connected with a motor; a rotating part of the motor is fixedly connected with a connecting shaft; a plurality of stirring blades are fixedly connected to the connecting shaft; the device further comprises a circular truncated cone frame, a liquid inlet pipe and the like. A liquid inlet and a hollow groove are formed in the connecting shaft; a flow guide groove is formed in each stirring blade, and a plurality of liquid outlets are formed in each stirring blade; a circular truncated cone frame is fixedly connected to the connecting shaft; and the stirring tank is communicated with a plurality of liquid inlet pipes. According to the utility model, through the rotation of the spiral plate I, falling assistants fall downwards from the round holes in different positions on the spiral plate I, so that different assistants are gradually mixed together, and the number of the round holes is gradually reduced from top to bottom, so that the mixed assistants are gradually blended together, the mixing time of slurry and the assistants is shortened, and the mixing efficiency of the slurry and the assistants is improved. And the mixing speed is increased.

Description

Technical Field

[0001] This utility model relates to the field of nanofiltration membrane preparation technology, and in particular to a device for preparing fluorinated polyamide composite nanofiltration membranes. Background Technology

[0002] Nanofiltration membranes are a novel separation membrane technology with a molecular weight cutoff between that of reverse osmosis and ultrafiltration membranes. They possess a nanoscale microporous structure. The production process of nanofiltration membranes includes steps such as casting preparation, casting, phase separation and membrane formation, and post-treatment. In the casting preparation step of nanofiltration membrane production, polymer materials need to be uniformly dissolved in an organic solvent to form a nanofiltration membrane slurry. When stirring the nanofiltration membrane slurry with existing stirring devices, additives need to be added to the slurry to improve the flexibility and stability of the nanofiltration membrane. Currently, additives are directly poured onto the slurry surface from above the stirring device and then stirred by the stirring device. This method results in slow mixing speed and poor mixing effect.

[0003] In summary, this application proposes a device for preparing fluorinated polyamide composite nanofiltration membranes, which improves the aforementioned technical problems. Utility Model Content

[0004] In order to overcome the shortcomings of the existing method of directly pouring the additives from above the stirring device onto the surface of the slurry and then mixing them by stirring, which has the disadvantages of slow mixing speed and poor mixing effect, this utility model provides a fluorinated polyamide composite nanofiltration membrane preparation device.

[0005] The technical solution of this utility model is: a fluorinated polyamide composite nanofiltration membrane preparation device, including a stirring tank, a motor, a connecting shaft, and stirring blades; the stirring tank is provided with an inlet pipe and an outlet pipe; the motor is fixedly connected to the stirring tank; the rotating part of the motor is fixedly connected to the connecting shaft; several stirring blades are fixedly connected to the connecting shaft; it also includes a frustum frame, an inlet pipe, and a spiral plate; the connecting shaft is provided with an inlet port and a hollow groove; each stirring blade is provided with a guide groove and several outlet ports, all of which are connected to the corresponding guide groove; the frustum frame is fixedly connected to the connecting shaft; several inlet pipes are connected to the stirring tank, and each inlet pipe is provided with a telescopic pipe at its bottom; a rotating cover is slidably connected to the frustum frame, the rotating cover is fixedly connected to the telescopic pipe, and the space between the telescopic pipe, the rotating cover, and the frustum frame is connected; a spiral plate is fixedly connected between the connecting shaft and the frustum frame, and several circular holes are provided on the spiral plate.

[0006] Furthermore, it also includes a second spiral plate and a stop block; the second spiral plate is fixedly connected inside the hollow groove; and several stop blocks arranged in a ring array are fixedly connected to the second spiral plate.

[0007] Furthermore, the guide channel is set in a V shape, and the liquid outlets on the stirring blades are distributed along the V shape of the guide channel.

[0008] Furthermore, the mixing blades, distributed from top to bottom, have gradually smaller liquid outlets.

[0009] Furthermore, the liquid outlets on the two stirring blades on the same horizontal plane are staggered.

[0010] Furthermore, the number of circular holes on the spiral plate decreases gradually from top to bottom, and there are no circular holes at the bottom of the spiral plate.

[0011] Beneficial effects: By rotating the spiral plate, the additives fall downward through the circular holes at different positions on the spiral plate, allowing different additives to gradually mix together. The number of circular holes gradually decreases from top to bottom, which reduces the mixing time of the slurry and additives and increases the mixing speed.

[0012] This invention sets the guide channel in a V shape, and the outlets on the stirring blades are distributed along the V shape of the guide channel, so that the additives flowing out from the outlets can flow out from different heights of the slurry in the mixing tank, thereby accelerating the mixing speed of the additives and the slurry. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of the fluorinated polyamide composite nanofiltration membrane preparation device of this utility model;

[0014] Figure 2 This is a cross-sectional view of the stirred tank of the fluorinated polyamide composite nanofiltration membrane preparation device disclosed in this utility model;

[0015] Figure 3 This is a schematic diagram of the connecting shaft and stirring blades of the fluorinated polyamide composite nanofiltration membrane preparation device of this utility model;

[0016] Figure 4 This is a cross-sectional view of the stirring blade of the fluorinated polyamide composite nanofiltration membrane preparation device disclosed in this utility model;

[0017] Figure 5 This is a cross-sectional view of the connecting shaft and the liquid inlet pipe of the fluorinated polyamide composite nanofiltration membrane preparation device of this utility model.

[0018] The labels in the diagram are as follows: 1-Agitator, 2-Motor, 3-Connecting shaft, 4-Agitator blade, 5-Frustum frame, 6-Inlet pipe, 7-Spiral plate one, 8-Spiral plate two, 9-Baffle, 101-Feed pipe, 102-Discharge pipe, 31-Inlet, 32-Hollow trough, 41-Guide trough, 42-Outlet, 51-Rotating cover, 61-Telescopic pipe, 71-Round hole. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Example: A device for preparing fluorinated polyamide composite nanofiltration membranes, referring to... Figures 1-5 As shown, it includes a mixing tank 1, a motor 2, a connecting shaft 3, and mixing blades 4; the mixing tank 1 is provided with a feed pipe 101 and a discharge pipe 102; the motor 2 is bolted to the mixing tank 1; the rotating part of the motor 2 is fixedly connected to the connecting shaft 3; a number of mixing blades 4 are fixedly connected to the connecting shaft 3.

[0021] It also includes a frustum frame 5, an inlet pipe 6, and a spiral plate 7; the connecting shaft 3 has an inlet 31 and a hollow groove 32; each stirring blade 4 has a guide groove 41 and several outlets 42, all of which are connected to the corresponding guide grooves 41; the frustum frame 5 is fixedly connected to the connecting shaft 3; the stirring tank 1 is connected to two inlet pipes 6, and each inlet pipe 6 has a telescopic pipe 61 at its bottom; a rotating cover 51 is slidably connected to the frustum frame 5, the rotating cover 51 is fixedly connected to the telescopic pipe 61, and the space between the telescopic pipe 61, the rotating cover 51, and the frustum frame 5 is connected; the spiral plate 7 is fixedly connected between the connecting shaft 3 and the frustum frame 5, and several circular holes 71 are opened on the spiral plate 7.

[0022] It also includes a spiral plate 2 8 and a stop block 9; the spiral plate 2 8 is fixedly connected inside the hollow groove 32; and a number of stop blocks 9 arranged in a ring array are fixedly connected to the spiral plate 2 8.

[0023] The guide channel 41 is set in a V shape, and the liquid outlet 42 opened on the stirring blade 4 is distributed along the V shape of the guide channel 41, so that the additive flowing out from the liquid outlet 42 can flow out from different heights of the slurry in the mixing tank 1, which speeds up the mixing speed of the additive and the slurry and makes the additive and the slurry mix more evenly.

[0024] The mixing blades 4 are distributed from top to bottom, and the liquid outlets 42 on them gradually decrease in size, so that the amount of mixed additives flowing out from top to bottom gradually decreases, making the amount of additives flowing out of the slurry approximately the same, thereby improving the mixing effect of additives and slurry.

[0025] The outlets 42 on the two stirring blades 4 on the same horizontal plane are staggered, so that the mixed additives flow out from the staggered outlets 42, which accelerates the mixing speed of the additives and slurry.

[0026] The number of holes 71 on the spiral plate 7 gradually decreases from top to bottom, and there are no holes 71 at the bottom of the spiral plate 7. This allows the additives to gradually mix together as they flow downwards along the surface of the spiral plate 7, thereby improving the degree of mixing of the additives.

[0027] The following describes how the above embodiments work:

[0028] First, connect motor 2 to the power supply, and connect inlet pipe 6 to the external infusion device.

[0029] In nanofiltration membrane production, a suitable polymer material is first selected and dissolved in an organic solvent. The mixture is stirred until homogeneous, forming a casting solution. This solution is then uniformly cast onto a support layer or an existing substrate membrane. The cast solution is then placed in a specific coagulation bath for phase separation. After phase separation, the nanofiltration membrane is removed from the coagulation bath and its surface is washed with deionized water to remove residual solvents and additives. During the preparation of the casting solution, additives are added to the slurry to enhance the flexibility of the nanofiltration membrane. While improving toughness and stability, directly pouring additives from above the mixing device onto the slurry surface and then mixing them is slow and ineffective. Therefore, an external conveying device is used to feed the slurry into the mixing tank 1 through the inlet pipe 6. The slurry is filled to one-half to two-thirds of the tank's capacity, and then stopped. Simultaneously, the motor 2 is started to rotate the connecting shaft 3 and the stirring blades 4, causing the blades 4 to agitate the slurry. Once the slurry is uniformly agitated, the external conveying device is used to introduce various additives into the inlet pipe 6. Inside, the additives flow through the inlet pipe 6 and the telescopic pipe 61 into the space between the connecting shaft 3, the frustum frame 5, and the rotating cover 51. During this process, the additives fall onto the surface of the spiral plate 7. When the motor 2 drives the connecting shaft 3 and the stirring blade 4 to rotate, the connecting shaft 3 drives the frustum frame 5 and the spiral plate 7 to rotate synchronously. This causes the fallen additives to fall downwards through the circular holes 71 at different positions on the spiral plate 7, gradually mixing the different additives together. The number of circular holes 71 gradually decreases from top to bottom, allowing the mixed additives to gradually... When the mixed additives flow to the position below the spiral plate 7 where there are no round holes 71, they are completely mixed together. Then, the mixed additives flow from the inlet 31 into the hollow tank 32. Subsequently, the additives in the hollow tank 32 flow into the guide channel 41 and flow out from the outlet 42 into the slurry in the mixing tank 1. As the stirring blades 4 stir the slurry, the slurry and additives are gradually mixed. Since the various additives have been mixed evenly after passing through the spiral plate 7, the mixing time of the slurry and additives is reduced, and the mixing speed is increased.

[0030] Furthermore, the guide channel 41 is set in a V shape, and the outlet 42 on the stirring blade 4 is distributed along the V shape of the guide channel 41, so that the additive flowing out from the outlet 42 can flow out from different heights of the slurry in the mixing tank 1, which accelerates the mixing speed of the additive and the slurry and makes the mixing of the additive and the slurry more uniform. Moreover, the outlet 42 on the stirring blade 4 distributed from top to bottom gradually decreases, so that the amount of the mixed additive flowing out from top to bottom gradually decreases, making the amount of additive flowing out in the slurry approximately the same, thereby improving the mixing effect of the additive and the slurry.

[0031] Furthermore, when multiple additives pass through the spiral plate 7 and enter the hollow tank 32 from the inlet 31, the additives in the hollow tank 32 will flow onto the spiral plate 8, causing the additives to flow downwards along the surface of the spiral plate 8. The spiral plate 8 is equipped with a baffle 9, which causes the additives to collide with the baffle 9 as they flow downwards along the surface of the spiral plate 8, further mixing the additives and improving the degree of mixing. After the additives and slurry are completely mixed, the discharge pipe 102 is opened, allowing the slurry to be discharged from the discharge pipe 102 into the external collection device.

[0032] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A device for preparing fluorine-containing polyamide composite nanofiltration membranes, comprising a stirring tank (1), a motor (2), a connecting shaft (3) and stirring blades (4); the stirring tank (1) is provided with an inlet pipe (101) and an outlet pipe (102); the stirring tank (1) is fixedly connected with the motor (2); the rotating part of the motor (2) is fixedly connected with the connecting shaft (3); the connecting shaft (3) is fixedly connected with a plurality of stirring blades (4); characterized in that: The circular truncated frame (5), the liquid inlet pipe (6) and the spiral plate one (7) are further included; the liquid inlet (31) and the hollow groove (32) are arranged on the connecting shaft (3); the flow guide groove (41) is arranged on each stirring blade (4); the liquid outlet (42) is arranged on each stirring blade (4); all the liquid outlets (42) are communicated with the corresponding flow guide grooves (41); the circular truncated frame (5) is fixedly connected to the connecting shaft (3); the stirring tank (1) is communicated with the liquid inlet pipe (6); the telescopic pipe (61) is arranged at the bottom of the liquid inlet pipe (6); the rotary cover (51) is slidably connected to the circular truncated frame (5); the telescopic pipe (61) is fixedly connected to the rotary cover (51); the space between the telescopic pipe (61), the rotary cover (51) and the circular truncated frame (5) is communicated; the spiral plate one (7) is fixedly connected between the connecting shaft (3) and the circular truncated frame (5); the circular hole (71) is arranged on the spiral plate one (7).

2. The fluoropolvamide composite nanofiltration membrane preparation device according to claim 1, characterized in that: The spiral plate two (8) and the stop block (9) are further included; the spiral plate two (8) is fixedly connected in the hollow groove (32); the stop block (9) is fixedly connected to the spiral plate two (8) and arranged in an annular array.

3. The device for preparing a fluoropolyamide composite nanofiltration membrane according to claim 1, characterized in that: The flow guide groove (41) is arranged in a V shape; the liquid outlets (42) arranged on the stirring blade (4) are distributed along the V shape of the flow guide groove (41).

4. The device for preparing a fluoropolyamide composite nanofiltration membrane according to claim 3, characterized in that: The liquid outlets (42) arranged on the stirring blades (4) are gradually reduced from top to bottom.

5. The apparatus for preparing a fluorine-containing polyamide composite nanofiltration membrane according to any one of claims 3-4, characterized in that: The liquid outlets (42) arranged on the two stirring blades (4) on the same horizontal plane are staggered.

6. The device for preparing a fluoropolyamide composite nanofiltration membrane according to claim 1, characterized in that: The circular holes (71) arranged on the spiral plate one (7) are gradually reduced from top to bottom; the lowermost part of the spiral plate one (7) is not provided with the circular hole (71).

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