Hydrophilic Modification Production Line for Heavy Ion Micro-Porous Membrane

Abstract

The present invention provides a hydrophilic modification production line for heavy ion microporous membranes, belonging to the technical field of heavy ion microporous membranes. It solves the problem that the self-stopping liquid effect of heavy ion microporous membranes used in precision infusion sets is poor due to poor hydrophilic modification quality. It includes a heavy ion microporous membrane unwinding mechanism, a photo-grafting mechanism, a heavy ion microporous membrane winding mechanism arranged in sequence, and a grafting liquid coating mechanism arranged between the heavy ion microporous membrane unwinding mechanism and the photo-grafting mechanism. The grafting liquid coating mechanism includes a bracket and a coating roller assembly connected to the bracket and arranged horizontally. The axial direction of the coating roller assembly is perpendicular to the direction from the grafting liquid coating mechanism to the photo-grafting mechanism. The coating roller assembly has a flow-through channel, and there are several permeation holes on the outer peripheral side of the coating roller assembly that communicate with the flow-through channel. A scraper is also connected to the bracket, and the scraper is closer to the photo-grafting mechanism than the coating roller assembly. It has the advantages of high-quality hydrophilic modification and good self-stopping liquid effect, etc.

Description

Technical Field

[0001] The present invention belongs to the technical field of heavy ion microporous membranes, and relates to a hydrophilic modification production line for heavy ion microporous membranes. Background Art

[0002] Heavy ion microporous membranes are a new type of microporous filtration membrane formed by bombarding the surface of a thin film with heavy ions to form nuclear tracks and then forming pores through irradiation and etching processes. It is a sieve-type filtering material with round micropore shapes and uniform pore diameters, capable of 100% retaining particles larger than the pore diameter. It is the only high-precision and excellent-performance filtering membrane with real pore diameters and is the best filtering choice for precision infusion sets. Currently, all precision infusion sets are required to automatically stop after the infusion is completed, that is, to have the self-stopping liquid (i.e., automatic liquid stopping) function. The principle is that when the infused liquid medicine is completely infiltrated into the membrane pores, due to the existence of surface tension, the liquid cannot spontaneously flow out of the pores. However, heavy ion microporous membranes are made of PET material, and the material itself has a compact structure and lacks hydrophilic groups. Therefore, existing heavy ion microporous membranes do not have the self-stopping liquid function. For this reason, it is necessary to improve the hydrophilicity of heavy ion microporous membranes, especially the hydrophilicity of each membrane pore (the effective adhesion of the liquid medicine in the membrane pores is the core factor for realizing self-stopping liquid).

[0003] In the existing hydrophilic modification, one method is photochemical grafting. For example, a porous membrane material ultraviolet grafting device and its grafting process disclosed in Patent Application No. 201910889460.7 use the method of soaking and wetting a porous membrane in a grafting liquid tank and then entering it into an ultraviolet grafting device for ultraviolet grafting to complete the hydrophilic modification of the membrane. Different from ordinary porous membranes, due to the lack of hydrophilic groups in heavy ion microporous membranes, it is difficult for the grafting liquid to form wetting in the membrane pores of heavy ion microporous membranes during short-term contact. Therefore, when using the above method for hydrophilic modification of heavy ion microporous membranes, generally, the soaking time of the heavy ion microporous membrane in the grafting liquid tank is extended to ensure that the grafting liquid can be adsorbed in each membrane pore of the heavy ion microporous membrane to form a wetting effect. However, the grafting liquid is a chemical agent, and extending the soaking time of the heavy ion microporous membrane in the grafting liquid tank is likely to cause chemical corrosion, resulting in a deterioration of the hydrophilic modification quality, which will thus affect the self-stopping liquid effect of the heavy ion microporous membrane after hydrophilic modification on precision infusion sets. Summary of the Invention

[0004] The object of the present invention is to address the above problems existing in the prior art and propose a hydrophilic modification production line for heavy ion microporous membranes, which solves the problem of poor self-stopping liquid effect of heavy ion microporous membranes used in precision infusion sets due to poor hydrophilic modification quality.

[0005] The object of the present invention can be achieved by the following technical solutions:

[0006] Hydrophilic modification production line for heavy ion microporous membranes, including a heavy ion microporous membrane unwinding mechanism, a photo-grafting mechanism, and a heavy ion microporous membrane winding mechanism arranged in sequence. It is characterized in that the hydrophilic modification production line for heavy ion microporous membranes further includes a grafting liquid coating mechanism arranged between the heavy ion microporous membrane unwinding mechanism and the photo-grafting mechanism. The grafting liquid coating mechanism includes a bracket and a coating roller assembly connected to the bracket and arranged horizontally. The axial direction of the coating roller assembly is perpendicular to the direction from the grafting liquid coating mechanism to the photo-grafting mechanism. The coating roller assembly has a flow-through channel and there are several permeation holes on the outer peripheral side of the coating roller assembly that communicate with the flow-through channel. A scraper is also connected to the bracket and the scraper is closer to the photo-grafting mechanism than the coating roller assembly.

[0007] Before production, wind the heavy ion microporous membrane into a cylinder and install it on the heavy ion microporous membrane unwinding mechanism. Then manually pass the heavy ion microporous membrane through the grafting liquid coating mechanism and the photo-grafting mechanism in sequence and wind it on the heavy ion microporous membrane winding mechanism. When the heavy ion microporous membrane passes through the grafting liquid coating mechanism, both the coating roller assembly and the scraper are in contact with the upper side of the heavy ion microporous membrane. In practice, the inlet of the channel of the coating roller assembly can be connected to the outlet of a water pump, and then use the water pump to pump the grafting liquid into the coating roller assembly.

[0008] During production, the heavy ion microporous membrane unwinding mechanism and the heavy ion microporous membrane winding mechanism work simultaneously. At this time, the heavy ion microporous membrane will move relative to the coating roller assembly and generate friction between the two, causing the coating roller assembly to rotate. The grafting liquid pumped into the coating roller assembly will penetrate to the outer peripheral side of the coating roller assembly through the permeation holes. Along with the pulling of the heavy ion microporous membrane and the rotation of the coating roller assembly, the grafting liquid that penetrates to the outer peripheral side of the coating roller assembly is coated on the heavy ion microporous membrane. Since the scraper is closer to the photo-grafting mechanism than the coating roller assembly, after the grafting liquid is coated on the upper side of the heavy ion microporous membrane, as the heavy ion microporous membrane continues to be pulled, the scraper will scrape the grafting liquid coated on the upper side of the heavy ion microporous membrane into each membrane pore of the heavy ion microporous membrane. Then, when the heavy ion microporous membrane passes through the photo-grafting mechanism, a grafting reaction can occur in each membrane pore of the heavy ion microporous membrane to improve the hydrophilicity of each membrane pore on the heavy ion microporous membrane.

[0009] During the movement of the heavy ion microporous membrane, the hydrophilic modification production line uses a coating roller assembly to automatically coat the grafting liquid onto the upper side of the heavy ion microporous membrane. Combining with the scraping action generated by the relative movement between the upper heavy ion microporous membrane and the scraper, the grafting liquid can be forced into each membrane pore of the heavy ion microporous membrane to form wetting. Due to the way that the scraper squeezes the grafting liquid into the membrane pores, compared with soaking the heavy ion microporous membrane in the grafting liquid tank, the risk of corrosion of the heavy ion microporous membrane before photo-grafting is greatly reduced, thus greatly improving the quality of the hydrophilic modification of the heavy ion microporous membrane and thereby improving the self-stopping liquid effect when the hydrophilic-modified heavy ion microporous membrane is applied to a precision filter.

[0010] In the above-mentioned hydrophilic modification production line of the heavy ion microporous membrane, the coating roller assembly includes a roller connected to a bracket and an outer sleeve fixed outside the roller and made of rubber. Penetration holes are densely distributed on the outer sleeve. The flow-through channel includes a main channel arranged along the axial direction of the roller and several liquid passing holes arranged on the outer peripheral side of the roller.

[0011] The coating roller assembly is set to include a roller connected to a bracket and an outer sleeve fixed outside the roller. The outer sleeve is made of rubber, so that a certain extrusion pressure can be formed in cooperation with the elasticity of the outer sleeve during the pulling process of the heavy ion microporous membrane. The grafting liquid (first flows into the main channel, then into the liquid passing holes, and finally penetrates from the penetration holes densely distributed on the outer sleeve to the outer peripheral side of the outer sleeve. The dense distribution of the penetration holes on the outer sleeve is similar to the principle of a breathable slipper sole in daily life) can be coated on the heavy ion microporous membrane and can be initially squeezed into the membrane pores of the heavy ion microporous membrane at the same time. Then, with the use of the scraper, the grafting liquid can be better squeezed into the membrane pores of the microporous membrane, so that the hydrophilicity of the membrane pores can be effectively modified during photo-grafting, further improving the quality of the hydrophilic modification of the heavy ion microporous membrane to ensure the self-stopping liquid effect when applied to a precision filter.

[0012] In the above-mentioned hydrophilic modification production line of the heavy ion microporous membrane, the roller includes a cylinder body and a connecting shaft passing through the cylinder body and fixedly connected to the bracket. The cylinder body can rotate relative to the connecting shaft. The main channel is arranged on the connecting shaft and the liquid passing holes are arranged on the outer peripheral side of the cylinder body. The flow-through channel further includes several circulation holes arranged on the outer peripheral side of the connecting shaft and a flow-through cavity located between the cylinder body and the connecting shaft.

[0013] The complete flow path of the grafting liquid is: main channel → circulation holes → flow-through cavity → liquid passing holes → penetration holes. The setting of the flow-through cavity is mainly to enable the grafting liquid to permeate from each penetration hole as much as possible during the rotation of the roller assembly, so that the grafting liquid can be coated more evenly on the heavy ion microporous membrane. Thus, during the pulling process of the heavy ion microporous membrane, the scraper can be cooperated to ensure that grafting liquid enters each membrane pore to guarantee the quality of the hydrophilic modification of the heavy ion microporous membrane.

[0014] In the hydrophilic modification production line of the above-mentioned heavy ion micro-porous membrane, the connecting shaft includes a shaft body and positioning heads extending from both ends of the shaft body. A cavity is provided inside the cylinder body. The two positioning heads respectively pass through both ends of the cylinder body, and bearings are provided between the positioning heads and the cylinder body. An overflow cavity is formed between the two bearings, the outer peripheral wall of the shaft body, and the inner wall of the cylinder body.

[0015] Through the above arrangement, an overflow cavity can be formed between the connecting shaft and the cylinder body, so as to ensure that the grafting liquid can be coated more evenly on the heavy ion micro-porous membrane to improve the quality of the hydrophilic modification of the heavy ion micro-porous membrane.

[0016] In the hydrophilic modification production line of the above-mentioned heavy ion micro-porous membrane, a movable groove is provided on the bracket, and the connecting shaft can move up and down along the movable groove and can be positioned after moving.

[0017] When the equipment is under maintenance or production stops due to a power outage, neither the heavy ion micro-porous membrane unwinding mechanism nor the heavy ion micro-porous membrane winding mechanism works, and at this time the heavy ion micro-porous membrane remains stationary. At this time, the connecting shaft can be moved upward and positioned so that the coating roller assembly does not contact the heavy ion micro-porous membrane, thereby avoiding the coating roller assembly from contacting the same position of the heavy ion micro-porous membrane for a long time during the equipment maintenance or production stop due to a power outage, which may cause corrosion to it, and ensuring the quality of the hydrophilic modification of the heavy ion micro-porous membrane in subsequent production.

[0018] In the hydrophilic modification production line of the above-mentioned heavy ion micro-porous membrane, two operating screws are threadedly connected to the bracket along the vertical direction. The rod portion of one operating screw is fixed to one of the positioning heads, and the rod portion of the other operating screw is fixed to the other positioning head.

[0019] The operating screw is threadedly connected to the bracket and the rod portion of the operating screw is fixed to the positioning head. When the operating screw is rotated, it will move up and down relative to the bracket along the thread. In this way, the connecting shaft will naturally move up or down and can be positioned after moving.

[0020] In the hydrophilic modification production line of the above-mentioned heavy ion micro-porous membrane, the scraper is made of rubber. The scraper is hinged to the bracket and can swing under its own gravity.

[0021] The squeegee is made of rubber, so it will not scratch the heavy ion microporous membrane. At the same time, the squeegee is hinged to the bracket and is set to swing under its own gravity. On the one hand, it ensures that the grafting liquid coated on the heavy ion microporous membrane can be smoothly scraped into the membrane pores during the pulling process of the heavy ion microporous membrane; on the other hand, when the heavy ion microporous membrane undulates during the pulling process due to the unwinding speed being greater than the winding speed, the squeegee can swing in coordination with the undulation of the heavy ion microporous membrane, thus avoiding the heavy ion microporous membrane being torn during the undulation process because the squeegee is fixed.

[0022] In addition, there will inevitably be grafting liquid remaining on the squeegee. When the equipment is under maintenance or production stops due to a power outage, the user can swing the squeegee in the reverse direction to avoid its long-term contact with the same position of the heavy ion microporous membrane during this process of equipment maintenance or production stoppage due to a power outage, which may cause corrosion to the membrane, ensuring the quality of the hydrophilic modification of the heavy ion microporous membrane in subsequent production.

[0023] In the above-mentioned hydrophilic modification production line of the heavy ion microporous membrane, the photo-grafting mechanism includes a frame and two oppositely arranged ultraviolet lamp rows provided on the frame. Both ultraviolet lamp rows are horizontally arranged on the frame. This hydrophilic modification production line also includes a protective film unwinding mechanism arranged between the grafting liquid coating mechanism and the photo-grafting mechanism, and a protective film winding mechanism arranged between the photo-grafting mechanism and the heavy ion microporous membrane winding mechanism.

[0024] Before production, a wound protective film in a cylindrical shape is sleeved on the protective film unwinding mechanism, and the protective film is passed through between the two ultraviolet lamp rows on the photo-grafting mechanism and then wound on the protective film winding mechanism. The protective film should be located below the heavy ion microporous membrane. The protective film only plays a protective role to prevent the grafting liquid from penetrating from the upper surface of the heavy ion microporous membrane to the lower surface and then dripping onto the ultraviolet lamp rows, which may affect the photo-grafting effect, and this can also improve the quality of the hydrophilic modification of the heavy ion microporous membrane to a certain extent.

[0025] In the above-mentioned hydrophilic modification production line of the heavy ion microporous membrane, this hydrophilic modification production line also includes a constant tension mechanism for the heavy ion microporous membrane arranged between the heavy ion microporous membrane unwinding mechanism and the grafting liquid coating mechanism. The constant tension mechanism for the heavy ion microporous membrane includes a mounting seat and a self-weight roller that can move up and down on the mounting seat. An upper position sensor and a lower position sensor are fixed on the mounting seat. When the self-weight roller moves down and approaches the lower position sensor, the heavy ion microporous membrane unwinding mechanism stops working. When the self-weight roller moves up and approaches the upper position sensor, the heavy ion microporous membrane unwinding mechanism starts working.

[0026] Since the unwinding speed of the heavy ion microporous membrane unwinding mechanism is always greater than the winding speed of the heavy ion microporous membrane winding mechanism (if the former is less than the latter, the heavy ion microporous membrane will be directly torn), this will cause phenomena such as lateral deviation or up-and-down undulation of the heavy ion microporous membrane during the production process. Therefore, a constant tension mechanism for the heavy ion microporous membrane is provided between the heavy ion microporous membrane unwinding mechanism and the grafting liquid coating mechanism of this hydrophilic modification production line for heavy ion microporous membranes. Specifically, before the heavy ion microporous membrane passes through the grafting liquid coating mechanism, the heavy ion microporous membrane is first passed through the mounting seat of the constant tension mechanism for the heavy ion microporous membrane, and the self-weight roller is pressed on the heavy ion microporous membrane under its own gravity. In this way, during the production process, when the heavy ion microporous membrane undulates up and down, the self-weight roller also moves up and down together. When the self-weight roller moves down and approaches the lower position sensor, the heavy ion microporous membrane unwinding mechanism is controlled to stop working, or when the self-weight roller moves up and approaches the upper position sensor, the heavy ion microporous membrane unwinding mechanism is controlled to start working. Thus, the heavy ion microporous membrane can always maintain a certain degree of tension during the production process, thereby ensuring the reliability of the hydrophilic modification of the heavy ion microporous membrane.

[0027] Generally speaking, in the conventional membrane production process, a commercially available tensioner is used to tension the membrane, and it automatically adjusts the pressure acting on the membrane according to the tension degree of the membrane. However, the number of membrane pores on the heavy ion microporous membrane is much larger than that of the conventional membrane and is very brittle. If a conventional tensioner is used to tension the membrane, the minimum pressure it exerts may also cause the heavy ion microporous membrane to break.

[0028] Compared with the prior art, this hydrophilic modification production line for heavy ion microporous membranes has the following advantages:

[0029] 1. During the movement of the heavy ion microporous membrane, the grafting liquid is automatically coated on the upper side of the heavy ion microporous membrane by using the coating roller assembly. Combining with the scraping action generated by the relative movement between the upper heavy ion microporous membrane and the scraper, the grafting liquid can be forced into each membrane pore of the heavy ion microporous membrane to form wetting, greatly reducing the risk of corrosion of the heavy ion microporous membrane before photo-grafting, thereby greatly improving the quality of the hydrophilic modification of the heavy ion microporous membrane and thus improving the self-stopping liquid effect when the hydrophilic-modified heavy ion microporous membrane is applied to a precision filter;

[0030] 2. By using the rubber-made outer sleeve on the coating roller assembly, a certain extrusion pressure can be formed in cooperation with the elasticity of the outer sleeve during the pulling process of the heavy ion microporous membrane, so that when the grafting liquid is coated on the heavy ion microporous membrane, it can be initially extruded into the membrane pores of the heavy ion microporous membrane. Then, in cooperation with the use of the scraper, the grafting liquid can be better extruded into the membrane pores of the microporous membrane. Only in this way can the hydrophilicity of the membrane pores be effectively modified during photo-grafting, further improving the quality of hydrophilicity modification of the heavy ion microporous membrane to ensure the self-stopping liquid effect when applied to the precision filter. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a three-dimensional schematic diagram of the hydrophilicity modification production line of this heavy ion microporous membrane.

[0032] Figure 2 is a sectional view of the hydrophilicity modification production line of this heavy ion microporous membrane.

[0033] Figure 3 is Figure 2 the enlarged view of part A in

[0034] Figure 4 is Figure 3 the enlarged view of the coating roller assembly in

[0035] Figure 5 is another sectional view (the sectional direction is perpendicular to Figure 2 ) of the position where the coating roller assembly is located in the hydrophilicity modification production line of this heavy ion microporous membrane.

[0036] Figure 6 is Figure 5 the enlarged view of the coating roller assembly in

[0037] In the figure, 1. Heavy ion microporous membrane unwinding mechanism; 2. Heavy ion microporous membrane constant tension mechanism; 3. Grafting liquid coating mechanism; 4. Photo-grafting mechanism; 5. Dryer; 6. Heavy ion microporous membrane winding mechanism; 7. Protective film unwinding mechanism; 8. Protective film winding mechanism; 9. Liner film unwinding mechanism; 10. Thermal laminating machine; 11. Mounting seat; 12. Self-weight roller; 13. Upper position sensor; 14. Lower position sensor; 15. Bracket; 15a. Movable groove; 15b. Grafting liquid recovery tank; 16. Coating roller assembly; 17. Flow-through channel; 17a. Main channel; 17b. Flow-through hole; 17c. Flow-through cavity; 17d. Liquid passing hole; 18. Permeation hole; 19. Roller; 19a. Cylinder body; 19b. Connecting shaft; 19b1. Shaft body; 19b2. Positioning head; 19b3. Connecting block; 20. Outer sleeve; 21. Bearing; 22. Operating screw; 23. Guide roller; 24. Scraper; 25. Frame; 26. UV lamp row; 27. Support roller; 28. Locking nut; 29. Heavy ion microporous membrane; 30. Protective film; 31. Liner film. Detailed implementation mode

[0038] The following are specific embodiments of the present invention. In combination with the accompanying drawings, the technical solutions of the present invention will be further described, but the present invention is not limited to these embodiments.

[0039] As shown in Figure 1 and Figure 2 shown, the hydrophilic modification production line of the heavy ion microporous membrane includes a heavy ion microporous membrane unwinding mechanism 1, a heavy ion microporous membrane constant tension mechanism 2, a grafting liquid coating mechanism 3, a photo-grafting mechanism 4, a dryer 5 and a heavy ion microporous membrane winding mechanism 6 arranged in sequence. The heavy ion microporous membrane unwinding mechanism 1 and the heavy ion microporous membrane winding mechanism 6 can directly adopt existing unwinding devices and winding devices, and their specific structures will not be described in detail here.

[0040] As shown in Figure 1 and Figure 2 shown, the heavy ion microporous membrane constant tension mechanism 2 includes a mounting seat 11 and a self-weight roller 12 arranged on the mounting seat 11 and capable of moving up and down. An upper position sensor 13 and a lower position sensor 14 are fixed on the mounting seat 11. When the self-weight roller 12 moves down and approaches the lower position sensor 14, the heavy ion microporous membrane unwinding mechanism 1 stops working. When the self-weight roller 12 moves up and approaches the upper position sensor 13, the heavy ion microporous membrane unwinding mechanism 1 starts to work. In this embodiment, both the upper position sensor 13 and the lower position sensor 14 are proximity sensors.

[0041] As shown in Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6As shown in the figure, the grafting liquid coating mechanism 3 includes a bracket 15 and a coating roller assembly 16 connected to the bracket 15 and arranged in the horizontal direction. The axial direction of the coating roller assembly 16 is perpendicular to the direction from the grafting liquid coating mechanism 3 to the optical grafting mechanism 4. The coating roller assembly 16 has a flow-through channel 17, and there are several penetration holes 18 on the outer peripheral side of the coating roller assembly 16 that communicate with the flow-through channel 17. A scraper 24 is also connected to the bracket 15, and the scraper 24 is closer to the optical grafting mechanism 4 than the coating roller assembly 16. Specifically, the coating roller assembly 16 includes a roller 19 connected to the bracket 15 and an outer sleeve 20 fixed outside the roller 19 and made of rubber. The penetration holes 18 are densely distributed on the outer sleeve 20. The flow-through channel 17 includes a main channel 17a arranged along the axial direction of the roller 19 and several liquid passing holes 17d arranged on the outer peripheral side of the roller 19. The roller 19 includes a cylinder body 19a and a connecting shaft 19b passing through the cylinder body 19a and fixedly connected to the bracket 15. The cylinder body 19a can rotate relative to the connecting shaft 19b. The main channel 17a is arranged on the connecting shaft 19b, and the liquid passing holes 17d are arranged on the outer peripheral side of the cylinder body 19a. The flow-through channel 17 further includes several flow-through holes 17b arranged on the outer peripheral side of the connecting shaft 19b and a flow-through cavity 17c located between the cylinder body 19a and the connecting shaft 19b. The connecting shaft 19b includes a shaft body 19b1 and positioning heads 19b2 extending from both ends of the shaft body 19b1. There is a cavity inside the cylinder body 19a. The two positioning heads 19b2 respectively pass through the two ends of the cylinder body 19a, and there is a bearing 21 between the positioning heads 19b2 and the cylinder body 19a. The above-mentioned flow-through cavity 17c is formed between the two bearings 21, the outer peripheral wall of the shaft body 19b1, and the inner wall of the cylinder body 19a. There is a movable groove 15a on the bracket 15. The connecting shaft 19b can move up and down along the movable groove 15a and can be positioned after moving. Two operating screws 22 are threadedly connected to the bracket 15 in the vertical direction. The rod portion of one operating screw 22 is fixed to one of the positioning heads 19b2, and the rod portion of the other operating screw 22 is fixed to the other positioning head 19b2. Specifically, coupling blocks 19b3 are fixed outside the two positioning heads 19b2. The rod portion of the operating screw 22 is threadedly connected to the corresponding coupling block 19b3, and a locking nut 28 is threadedly connected to the operating screw 22. The locking nut 28 abuts against the coupling block 19b3. By tightening the locking nut 28, the operating screw 22 and the coupling block 19b3 are fixed, so that there is no relative movement between the operating screw 22 and the coupling block 19b3 when the operating screw 22 rotates. The scraper 24 is made of rubber. The scraper 24 is hinged to the bracket 15 and can swing under its own gravity. The bracket 15 has a grafting liquid recovery tank 15b. The coating roller assembly 16 and the scraper 24 are both located above the grafting liquid recovery tank 15b. In this embodiment, two guide rollers 23 are also fixed to the bracket 15. The heights of the two guide rollers 23 are the same, and the coating roller assembly 16 is located between the two guide rollers 23.

[0042] As Figure 1and Figure 2 As shown in Figure 2 , the photo-grafting mechanism 4 includes a frame 25 and two ultraviolet lamp rows 26 which are arranged on the frame 25 and face each other. Both of the two ultraviolet lamp rows 26 are arranged on the frame 25 in the horizontal direction. On the frame 25 of the photo-grafting mechanism 4, there are two support rollers 27. The ultraviolet lamp rows 26 are located between the two support rollers 27 along their arrangement direction. The two support rollers 27 have the same height, and the height of the support rollers 27 is located between the two ultraviolet lamp rows 26. In this embodiment, the hydrophilic modification production line further includes a protective film unwinding mechanism 7 arranged between the grafting liquid coating mechanism 3 and the photo-grafting mechanism 4, and a protective film winding mechanism 8 arranged between the photo-grafting mechanism 4 and the heavy ion microporous membrane winding mechanism 6. Further, the hydrophilic modification production line further includes a lining film unwinding mechanism 9 and a thermal laminating machine 10 which are sequentially arranged between the dryer 5 and the heavy ion microporous membrane winding mechanism 6.

[0043] Before production, first arrange the protective film 30 and the lining film 31: Install the protective film 30 wound in a cylindrical shape on the protective film unwinding mechanism 7, and then manually pass the protective film 30 through the photo-grafting mechanism 4 in an unfolded manner and wind it on the protective film unwinding mechanism 7. Specifically, the protective film 30 passes through between the two ultraviolet lamp rows 26 of the photo-grafting mechanism 4, and the two support rollers 27 are in contact with the lower side of the protective film 30; Wind and install the lining film 31 wound in a cylindrical shape on the lining film unwinding mechanism 9, and then manually pass the lining film 31 through the thermal laminating machine 10 in an unfolded manner and wind it on the heavy ion microporous membrane winding mechanism 6. Then, arrange the heavy ion microporous membrane 29: Wind and install the heavy ion microporous membrane 29 wound in a cylindrical shape on the heavy ion microporous membrane unwinding mechanism 1, and then manually pass the heavy ion microporous membrane 29 through the heavy ion microporous membrane constant tension mechanism 2 (the self-weight roller 12 in the heavy ion microporous membrane constant tension mechanism 2 presses on the upper side of the heavy ion microporous membrane 29), the grafting liquid coating mechanism 3 (both of the two guiding rollers 23 in the grafting liquid coating mechanism 3 are in contact with the lower side of the heavy ion microporous membrane 29, while the coating roller assembly 16 and the scraper 24 are both in contact with the upper side of the heavy ion microporous membrane 29. In practice, the inlet of the channel of the coating roller assembly 16 can be connected to the outlet of the water pump, and then the grafting liquid is pumped into the coating roller assembly 16 by the water pump. The grafting liquid recovery tank 15b can be connected to the grafting liquid tank with a pipe to realize the recycling of the grafting liquid), the photo-grafting mechanism 4 (the heavy ion microporous membrane 29 passes through between the two ultraviolet lamp rows 26, the heavy ion microporous membrane 29 is located above the protective film 30 and is also supported by the two support rollers 27 for the heavy ion microporous membrane 29), the dryer 5 and the thermal laminating machine 10 (the lining film 31 is located below the heavy ion microporous membrane 29) and then wind it on the heavy ion microporous membrane winding mechanism 6. The final state is as shown in Figure 1 and Figure 2 shown.

[0044] During production, the heavy ion microporous membrane unwinding mechanism 1 and the heavy ion microporous membrane winding mechanism 6 work simultaneously (the protective film unwinding mechanism 7, the protective film winding mechanism 8, and the lining film unwinding mechanism 9 also work), and the heavy ion microporous membrane 29 will be pulled. Since the unwinding speed of the heavy ion microporous membrane unwinding mechanism 1 is always greater than the winding speed of the heavy ion microporous membrane winding mechanism 6 (if the former is less than the latter, the heavy ion microporous membrane 29 will be directly torn), when the heavy ion microporous membrane 29 undulates up and down, the self-weight roller 12 also moves up and down together. When the self-weight roller 12 moves down and approaches the lower position sensor 14, the heavy ion microporous membrane unwinding mechanism 1 is controlled to stop working, or when the self-weight roller 12 moves up and approaches the upper position sensor 13, the heavy ion microporous membrane unwinding mechanism 1 is controlled to start working. Thus, the heavy ion microporous membrane 29 can always maintain a certain degree of tension during production, ensuring the reliability of the hydrophilic modification of the heavy ion microporous membrane 29. The heavy ion microporous membrane 29 will move relative to the coating roller assembly 16, generating frictional force therebetween, and the coating roller assembly 16 will thus rotate. The grafting liquid pumped into the coating roller assembly 16 will penetrate to the outer peripheral side of the coating roller assembly 16 through the permeating liquid. Along with the pulling of the heavy ion microporous membrane 29 and the rotation of the coating roller assembly 16, the grafting liquid that has penetrated to the outer peripheral side of the coating roller assembly 16 is coated onto the heavy ion microporous membrane 29. Since the outermost side of the coating roller assembly 16 is an outer sleeve 20 made of rubber, a certain extrusion force can be formed in cooperation with the elasticity of the outer sleeve 20 during the pulling of the heavy ion microporous membrane 29, so that the grafting liquid can be initially extruded into the membrane pores of the heavy ion microporous membrane 29 while being coated on the heavy ion microporous membrane 29. And since the squeegee 24 is closer to the photo-grafting mechanism 4 than the coating roller assembly 16, after the grafting liquid is coated on the upper side of the heavy ion microporous membrane 29, as the heavy ion microporous membrane 29 continues to be pulled, the squeegee 24 will scrape the grafting liquid coated on the upper side of the heavy ion microporous membrane 29 into each membrane pore of the heavy ion microporous membrane 29. Then, when the heavy ion microporous membrane 29 passes between the two ultraviolet lamp rows 26 of the photo-grafting mechanism 4, grafting reactions can occur in each membrane pore of the heavy ion microporous membrane 29 through the direct irradiation of the ultraviolet lamps to achieve the hydrophilic modification of each membrane pore on the heavy ion microporous membrane 29. During photo-grafting, the protective film 30 is located below the heavy ion microporous membrane 29. The protective film 30 only serves to protect and prevent grafting liquid droplets from falling onto the ultraviolet lamp rows 26, and does not affect the action of the ultraviolet lamps on the heavy ion microporous membrane 29. After that, the heavy ion microporous membrane 29 that has completed the hydrophilic modification is pulled into the dryer 5 for drying, and then enters the thermal laminating machine 10 and is thermally laminated with the lining film 31 and finally wound on the heavy ion microporous membrane winding mechanism 6 (the heavy ion microporous membrane 29 is very brittle, and thermally laminating the lining film 31 with the heavy ion microporous membrane 29 can ensure the strength of the heavy ion microporous membrane 29).

[0045] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art to which the present invention pertains may make various modifications or supplements to the described specific embodiments or use similar means for substitution, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. Hydrophilic modification production line for heavy ion microporous membranes, comprising a heavy ion microporous membrane unwinding mechanism (1), a photo-grafting mechanism (4) and a heavy ion microporous membrane winding mechanism (6) arranged in sequence, characterized in that, The hydrophilic modification production line of this heavy ion microporous membrane further includes a grafting liquid coating mechanism (3) arranged between the heavy ion microporous membrane unwinding mechanism (1) and the photo-grafting mechanism (4). The grafting liquid coating mechanism (3) includes a bracket (15) and a coating roller assembly (16) connected to the bracket (15) and arranged horizontally. The axial direction of the coating roller assembly (16) is perpendicular to the direction from the grafting liquid coating mechanism (3) to the photo-grafting mechanism (4). The coating roller assembly (16) has a flow-through channel (17), and there are several permeation holes (18) on the outer peripheral side of the coating roller assembly (16) that communicate with the flow-through channel (17). A scraper (24) is also connected to the bracket (15), and the scraper (24) is closer to the photo-grafting mechanism (4) than the coating roller assembly (16). The coating roller assembly (16) includes a roller (19) connected to the bracket (15) and a jacket (20) fixed outside the roller (19) and made of rubber. The permeation holes (18) are densely distributed on the jacket (20). The flow-through channel (17) includes a main channel (17a) arranged along the axial direction of the roller (19) and several liquid passing holes (17d) arranged on the outer peripheral side of the roller (19). This hydrophilic modification production line further includes a constant tension mechanism (2) for the heavy ion microporous membrane arranged between the heavy ion microporous membrane unwinding mechanism (1) and the grafting liquid coating mechanism (3). The constant tension mechanism (2) for the heavy ion microporous membrane includes a mounting base (11) and a self-weight roller (19) arranged on the mounting base (11) and capable of moving up and down. An upper position sensor (13) and a lower position sensor (14) are fixed on the mounting base (11). When the self-weight roller (19) moves down and approaches the lower position sensor (14), the heavy ion microporous membrane unwinding mechanism (1) stops working. When the self-weight roller (19) moves up and approaches the upper position sensor (13), the heavy ion microporous membrane unwinding mechanism (1) starts working.

2. The hydrophilic modification production line for heavy ion microporous membranes according to claim 1, characterized in that, The roller (19) includes a cylinder body (19a) and a connecting shaft (19b) passing through the cylinder body (19a) and fixedly connected to the bracket (15). The cylinder body (19a) can rotate relative to the connecting shaft (19b). The main channel (17a) is arranged on the connecting shaft (19b), and the liquid passing holes (17d) are arranged on the outer peripheral side of the cylinder body (19a). The flow-through channel (17) further includes several flow-through holes (17b) arranged on the outer peripheral side of the connecting shaft (19b) and a flow-through cavity (17c) located between the cylinder body (19a) and the connecting shaft (19b).

3. The hydrophilic modification production line for heavy ion microporous membranes according to claim 2, characterized in that, The connecting shaft (19b) includes a shaft body (19b1) and positioning heads (19b2) extending from both ends of the shaft body (19b1). There is a cavity inside the cylinder body (19a). The two positioning heads (19b2) respectively pass through the two ends of the cylinder body (19a), and bearings (21) are arranged between the positioning heads (19b2) and the cylinder body (19a). The above-mentioned flow-through cavity (17c) is formed between the two bearings (21), the outer peripheral wall of the shaft body (19b1), and the inner wall of the cylinder body (19a).

4. The hydrophilic modification production line for heavy ion microporous membranes according to claim 3, characterized in that, The described bracket (15) is provided with a movable groove (15a), and the connecting shaft (19b) can move up and down along the movable groove (15a) and can be positioned after moving.

5. The hydrophilic modification production line for heavy ion microporous membranes according to claim 4, characterized in that, Two operating screws (22) are threadedly connected to the described bracket (15) in the vertical direction. The rod portion of one operating screw (22) is fixed to one of the positioning heads (19b2), and the rod portion of the other operating screw (22) is fixed to the other positioning head (19b2).

6. The hydrophilic modification production line for heavy ion microporous membranes according to claim 1 or 2 or 3 or 4 or 5, characterized in that, The described scraper (24) is made of rubber. The scraper (24) is hinged to the bracket (15) and the scraper (24) can swing under its own gravity.

7. The hydrophilic modification production line for heavy ion microporous membranes according to claim 6, characterized in that, The described photo-grafting mechanism (4) includes a frame (25) and two relatively arranged ultraviolet lamp rows (26) provided on the frame (25). Both ultraviolet lamp rows (26) are arranged on the frame (25) in the horizontal direction. This hydrophilic modification production line further includes a protective film unwinding mechanism (7) arranged between the grafting liquid coating mechanism (3) and the photo-grafting mechanism (4) and a protective film winding mechanism (8) arranged between the photo-grafting mechanism (4) and the heavy ion microporous membrane winding mechanism (6).

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