Polyolefin reverse osmosis membrane processing system

Abstract

The utility model belongs to the technical field of reverse osmosis membranes, and discloses a polyolefin reverse osmosis membrane processing system which comprises an unwinding device, a water phase dipping device, an oil phase coating device and a first moisturizing device, and the unwinding device comprises an unwinding component and a winding component; the water phase impregnation device and the oil phase coating device are both arranged between the unwinding component and the winding component, and the water phase impregnation device is located at the upstream of the oil phase coating device; the first moisturizing device is arranged between the water phase dipping device and the oil phase coating device, the first moisturizing device is used for moisturizing one side of the base film before oiling, and the oil phase coating device is used for oiling the other side of the base film after moisturizing. According to the polyolefin reverse osmosis membrane processing system disclosed by the utility model, the first moisturizing device is used for moisturizing the base membrane before being coated with oil, so that the membrane forming quality is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of reverse osmosis membranes, in particular to a polyolefin reverse osmosis membrane processing system. Background Art

[0002] Polyolefin diaphragms are currently the most widely used battery diaphragm materials. Due to their advantages such as thin thickness, high temperature resistance, chemical corrosion resistance, and low cost, they are also used in reverse osmosis membranes. However, compared with polysulfone substrates, polyolefin reverse osmosis membranes have hydrophobic properties. Although plasma modification technology is used before interfacial polymerization to make the hydrophobic polyolefin reverse osmosis membrane surface temporarily hydrophilic, its water retention is still poor, resulting in incomplete reaction during interfacial polymerization and poor membrane quality. Utility Model Content

[0003] The utility model aims to provide a polyolefin reverse osmosis membrane processing system, which utilizes a first moisturizing device to moisturize a base membrane before oiling so as to improve the film forming quality.

[0004] To achieve this purpose, the present invention adopts the following technical solutions:

[0005] Polyolefin reverse osmosis membrane processing system, including:

[0006] An unwinding device, comprising an unwinding component and a rewinding component;

[0007] A water-phase impregnation device and an oil-phase coating device, both of which are arranged between the unwinding component and the winding component, and the water-phase impregnation device is located upstream of the oil-phase coating device;

[0008] The first moisturizing device is arranged between the water phase immersion device and the oil phase coating device. The first moisturizing device is used to moisturize one side of the base film before oil coating, and the oil phase coating device is used to oil the other side of the base film after moisturizing.

[0009] As an optional technical solution, the first moisturizing device includes a coating roller and a storage tank, and the coating roller is used to apply the moisturizing coating in the storage tank to the base film.

[0010] As an optional technical solution, the polyolefin reverse osmosis membrane processing system further includes a metering roller, which is used to press the base membrane against the coating roller and control and measure the amount of coating applied to the base membrane.

[0011] As an optional technical solution, the first moisturizing device includes a first spray pipe, which is used to spray the moisturizing coating on the base film.

[0012] As an optional technical solution, the distance between the water phase immersion device and the oil phase coating device is less than 0.5 meters.

[0013] As an optional technical solution, the distance between the first moisturizing device and the oil phase coating device is 0.1 meter to 0.3 meter.

[0014] As an optional technical solution, a drying device is provided between the oil phase coating device and the winding component, and the drying device is used to dry the base film.

[0015] As an optional technical solution, a second moisturizing device is provided between the oil phase coating device and the drying device, and the second moisturizing device is used to moisturize the non-oil-coated surface of the base film.

[0016] As an optional technical solution, the second moisturizing device includes a second spray pipe, which is used to spray the moisturizing coating on the base film.

[0017] As an optional technical solution, a pre-soaking tank is provided between the unwinding component and the aqueous phase impregnation device, and the pre-soaking tank stores pre-soaked coating.

[0018] Beneficial effects of the utility model:

[0019] The polyolefin reverse osmosis membrane processing system provided by the utility model includes a unwinding device, a water phase impregnation device, an oil phase coating device and a first moisturizing device, the unwinding device includes a unwinding component and a winding component; the water phase impregnation device and the oil phase coating device are both arranged between the unwinding component and the winding component, and the water phase impregnation device is located upstream of the oil phase coating device; the first moisturizing device is arranged between the water phase impregnation device and the oil phase coating device, the first moisturizing device is used to moisturize one side of the base membrane before oiling, and the oil phase coating device is used to oil the other side of the base membrane after moisturizing.

[0020] The unwinding component is used to unwind the base film, and the winding component is used to wind up the base film. The base film unwinding the base film passes through the water-phase impregnation device, the first moisturizing device and the oil-phase coating device in sequence. When the base film passes through the water-phase impregnation device, the base film is completely immersed in the water-phase coating of the water-phase impregnation device, so that not only the surface of the base film is attached with the water-phase coating, but also the pores of the base film are filled with the water-phase coating. When the base film passes through the first moisturizing device, the first moisturizing device moisturizes one side of the base film. When the base film passes through the oil-phase coating device, the oil-phase coating device coats the oil-phase coating on the other side of the base film. Since the base membrane is moisturized before oiling, it is prevented from being too dry, which may lead to incomplete reaction during interfacial polymerization; the oiled surface and moisturizing surface of the base membrane are respectively located on both sides of the base membrane. Therefore, after the base membrane is moisturized by the first moisturizing device, it can well ensure that there is sufficient water phase in the base membrane body when it is coated with oil phase, and diffuse to the oil phase to fully cause interfacial polymerization reaction at the water-oil phase interface, forming a uniformly distributed and thin polymer layer, avoiding the interfacial polymerization reaction occurring only on the surface of the base membrane, resulting in the interfacial polymerization product being not distributed or unevenly distributed in the base membrane body, affecting the final application of the reverse osmosis membrane. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a structural layout diagram of the polyolefin reverse osmosis membrane processing system of the present utility model;

[0022] Figure 2 This is a partial structural layout diagram of the polyolefin reverse osmosis membrane processing system of the present invention (when the first moisturizing device includes a coating roller, a storage tank and a metering roller);

[0023] Figure 3 This is a partial structural layout diagram of the polyolefin reverse osmosis membrane processing system of the present invention (when the first moisturizing device includes a first shower pipe).

[0024] In the picture:

[0025] 100, basement membrane;

[0026] 11. Unwinding component; 12. Rewinding component;

[0027] 2. Aqueous phase impregnation device;

[0028] 3. Oil phase coating device;

[0029] 4. First moisturizing device; 41. Coating roller; 42. Storage tank; 43. First spray pipe;

[0030] 5. Drying device;

[0031] 6. Second moisturizing device;

[0032] 7. Pre-soaking tank;

[0033] 8. Measuring roller. DETAILED DESCRIPTION

[0034] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0035] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0036] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0037] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0038] like Figure 1As shown, the polyolefin reverse osmosis membrane processing system provided in this embodiment includes a unwinding device, an aqueous phase impregnation device 2, an oil phase coating device 3 and a first moisturizing device 4, the unwinding device includes a unwinding part 11 and a rewinding part 12; the aqueous phase impregnation device 2 and the oil phase coating device 3 are both arranged between the unwinding part 11 and the rewinding part 12, and the aqueous phase impregnation device 2 is located upstream of the oil phase coating device 3, the base film 100 released by the unwinding part 11 first passes through the aqueous phase impregnation device 2 and then passes through the oil phase coating device 3, and finally the base film 100 is retracted by the rewinding part 12; the first moisturizing device 4 is arranged between the aqueous phase impregnation device 2 and the oil phase coating device 3, the first moisturizing device 4 is used to moisturize one side of the base film 100 before oiling, and the oil phase coating device 3 is used to oil the other side of the base film 100 after moisturizing.

[0039] The unwinding part 11 is used to unwind the base film 100, and the winding part 12 is used to wind up the base film 100. The base film 100 unwound by the unwinding part 11 passes through the aqueous phase impregnation device 2, the first moisturizing device 4 and the oil phase coating device 3 in sequence. When the base film 100 passes through the aqueous phase impregnation device 2, the base film 100 is completely immersed in the aqueous phase coating of the aqueous phase impregnation device 2, so that not only the surface of the base film 100 is attached with the aqueous phase coating, but also the pores of the base film 100 are filled with the aqueous phase coating. When the base film 100 passes through the first moisturizing device 4, the first moisturizing device 4 moisturizes one side of the base film 100. When the base film 100 passes through the oil phase coating device 3, the oil phase coating device 3 coats the oil phase coating on the other side of the base film 100. Since the base membrane 100 is moisturized before being coated with oil, the water supply of the base membrane 100 is kept sufficient, preventing the base membrane 100 from losing water phase before the oil phase is coated, resulting in incomplete reaction during interfacial polymerization; the oiled surface and the moisturizing surface of the base membrane 100 are respectively located on both sides of the base membrane 100, so that after the base membrane 100 is moisturized by the first moisturizing device 4, it can be well ensured that there is sufficient water phase in the base membrane 100 film body when it is coated with oil phase, and diffused to the oil phase to fully undergo interfacial polymerization reaction at the water-oil phase interface, forming a uniformly distributed and thin polymer layer, avoiding the interfacial polymerization reaction occurring only on the surface of the base membrane 100, resulting in the interfacial polymerization product being not distributed or unevenly distributed in the base membrane 100 film body, affecting the application of the final reverse osmosis membrane.

[0040] It can be understood that as long as the oil-coated surface and the moisturizing surface of the base film 100 are respectively located on both sides of the base film 100, that is, the discharge component of the first moisturizing device 4 and the discharge component of the oil phase coating device 3 are respectively arranged on both sides of the base film 100, there is no restriction on the arrangement of other components of the first moisturizing device 4 and the oil phase coating device 3, such as storage components, feeding components, etc.

[0041] In this embodiment, the first moisturizing device 4 and the oil phase coating device 3 are respectively arranged on both sides of the base film 100. In some other embodiments, the main body of the first moisturizing device 4 and the oil phase coating device 3 are located on the same side of the base film 100, and the moisturizing nozzle of the first moisturizing device 4 is located on the other side of the base film 100.

[0042] In this embodiment, the aqueous coating of the aqueous impregnation device 2 can be one or more combinations of m-phenylenediamine, p-phenylenediamine, piperazine o-phenylenediamine, sodium lauryl sulfate, camphorsulfonic acid, sodium carbonate, sodium bicarbonate, and the like.

[0043] In this embodiment, the moisturizing coating provided by the first moisturizing device 4 can be one or more combinations of m-phenylenediamine, p-phenylenediamine, piperazine o-phenylenediamine, sodium lauryl sulfate, camphorsulfonic acid, sodium carbonate, sodium bicarbonate, etc.

[0044] Optionally, the aqueous coating provided by the aqueous immersion device 2 and the moisturizing coating provided by the first moisturizing device 4 may be the same or different, including the type and concentration of the coating.

[0045] In this embodiment, the oil-phase coating provided by the oil-phase coating device 3 may be one or more of trimesoyl chloride, n-hexane, Isopar G, Isopar L, and the like.

[0046] The winding method of the unwinding component 11 and the winding method of the winding component 12 can refer to the existing technology and will not be described in detail in this embodiment. In this embodiment, the unwinding component 11 is located at the head end of the polyolefin reverse osmosis membrane processing system, and the winding component 12 is located at the end of the polyolefin reverse osmosis membrane processing system.

[0047] like Figure 2 As shown, optionally, the first moisturizing device 4 includes a coating roller 41 and a storage tank 42 , and the coating roller 41 is used to apply the moisturizing coating in the storage tank 42 to the base film 100 .

[0048] In this embodiment, the oil phase coating device 3 is located above the base film 100, and the oil phase coating device 3 applies oil to the upper surface of the base film 100. The coating roller 41 and the storage tank 42 are located below the base film 100. The lower side of the coating roller 41 is immersed in the moisturizing coating in the storage tank 42, and the upper side of the coating roller 41 is in contact with the lower surface of the base film 100. During the rotation of the coating roller 41, the moisturizing coating can be efficiently applied to the lower surface of the base film 100, so that the base film 100 maintains a suitable humidity before oiling, so as to improve the film forming quality; the unwinding component 11 and the winding component 12 are both rollers, and the coating roller 41 has the same physical properties as the unwinding component 11 and the winding component 12 in the unwinding device. Even if no additional tension control system is set, good stability can be maintained. Reduce costs; the coating roller 41 has a high degree of contact with the base film 100, and the coating effect is obvious, thereby improving the moisturizing efficiency; the excess moisturizing coating lifted by the coating roller 41 can fall back to the storage tank 42 by its own gravity for reuse, and can avoid falling to the ground and polluting the environment; the coating roller 41 has a long service life and is easy to replace, with low maintenance costs; the moving direction of the base film 100 is the same as the direction of action of the coating roller 41 on the base film 100, reducing wear. For example, the water-phase impregnation device 2 is located on the left side of the first moisturizing device 4, and the oil-phase coating device 3 is located on the right side of the first moisturizing device 4. The base film 100 moves from left to right, and the coating roller 41 rotates clockwise at this time, so that the moving direction of the base film 100 is the same as the direction of action of the coating roller 41 on the base film 100. The coating roller 41 and the storage tank 42 are both located below the base film 100, and the back of the base film 100 refers to the bottom surface of the base film 100.

[0049] Optionally, the polyolefin reverse osmosis membrane processing system further includes a metering roller 8, which is used to press the base film 100 against the coating roller 41 and control and measure the amount of coating applied to the base film 100. The metering roller 8 and the coating roller 41 are located on either side of the base film 100, respectively. The metering roller 8 rotates in the opposite direction to the coating roller 41. The base film 100 passes between the coating roller 41 and the metering roller 8 at a preset speed. At this time, the metering roller 8 can control the pressure on the base film 100 and calculate the amount of coating applied to the base film 100.

[0050] like Figure 3 As shown, in some other embodiments, the first moisturizing device 4 includes a first spray pipe 43, which is used to spray the moisturizing coating onto the base film 100. The first spray pipe 43 and the oil-phase coating device 3 are respectively disposed on either side of the base film 100. Alternatively, the main body of the first spray pipe 43 and the oil-phase coating device 3 are located on the same side of the base film 100, and the nozzle of the first spray pipe 43 is located on the other side of the base film 100. The first spray pipe 43 uses a water pump to control the pressure and flow rate to improve the spraying effect on the base film 100.

[0051] Optionally, the distance between the water-phase immersion device 2 and the oil-phase coating device 3 is less than 0.5 meters. The distance between the water-phase immersion device 2 and the oil-phase coating device 3 refers to the distance from the position where the base film 100 just leaves the water-phase liquid surface to the position where the base film 100 just begins to be coated with the oil phase.

[0052] Optionally, the distance between the first moisturizing device 4 and the oil phase coating device 3 is 0.1 m to 0.3 m. The distance between the first moisturizing device 4 and the oil phase coating device 3 refers to the distance from the moisturizing position of the base film 100 just after leaving the first moisturizing device 4 to the position where the base film 100 just enters the oil phase coating device 3 for oil phase coating.

[0053] Optionally, a drying device 5 is provided between the oil phase coating device 3 and the winding component 12, and the drying device 5 is used to dry the base film 100. The drying device 5 is an oven, and after the interfacial polymerization is completed, the base film 100 is dried in the oven so that the winding component 12 can wind up the base film 100.

[0054] Optionally, a second moisturizing device 6 is provided between the oil phase coating device 3 and the drying device 5 , and the second moisturizing device 6 is used to moisturize the non-oil-coated surface of the base film 100 .

[0055] The interfacial polymerization reaction requires a certain amount of time, and during the production process of the reverse osmosis membrane, the base membrane 100 will continue to operate, and the water-phase coating that has not reacted during the operation of the base membrane 100 will still be lost during the process, affecting the reaction efficiency. Therefore, after the oil phase coating device 3 oils the base membrane 100, it still needs to be kept moist. Therefore, this embodiment uses a second moisturizing device 6 to apply the moisturizing coating to the base membrane 100; the second moisturizing device 6 moisturizes the non-oiled surface of the base membrane 100, which can further ensure that there is sufficient water phase in the base membrane 100, making the interfacial polymerization reaction more sufficient and the interfacial reaction more evenly distributed in the base membrane 100.

[0056] In this embodiment, the second moisturizing device 6 and the oil phase coating device 3 are respectively arranged on both sides of the base film 100. In some other embodiments, the main body of the second moisturizing device 6 and the oil phase coating device 3 are located on the same side of the base film 100, and the moisturizing nozzle of the second moisturizing device 6 is located on the other side of the base film 100.

[0057] Optionally, the second moisturizing device 6 includes a second spray nozzle for spraying the moisturizing coating onto the base film 100. The oil-phase coating device 3 applies the oil-phase coating onto the upper surface of the base film 100, and the second spray nozzle sprays the moisturizing coating onto the lower surface of the base film 100. The second spray nozzle utilizes a water pump to control the pressure and flow rate to improve the spraying effect on the base film 100.

[0058] The base film 100 passes through the oil phase coating device 3 and the drying device 5 in a straight line. At the same time, in order to improve space utilization, the space between the oil phase coating device 3 and the drying device 5 is small, and the volume of the second spray pipe is small, which is suitable for moisturizing the oiled base film 100 in a smaller space.

[0059] Optionally, a pre-soak tank 7 is provided between the unwinding member 11 and the aqueous phase impregnation device 2. The pre-soak tank 7 stores a pre-soak coating. The pre-soak coating may be one or more combinations of pure water, ethanol, isopropyl alcohol, ethylene glycol, butanol, DMF, DMAC, DMSO, etc. The provision of the pre-soak tank 7 facilitates improving the efficiency with which the aqueous phase coating enters the pores of the base film 100 and further ensures the amount of aqueous phase coating carried by the base film 100, thereby improving production efficiency and further enhancing the efficiency of the interfacial polymerization reaction and the uniformity of the distribution of the polymerization product.

[0060] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the manner in which the present invention is to be implemented. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. Polyolefin reverse osmosis membrane processing system, characterized in that, include: An unwinding device comprises an unwinding component (11) and a rewinding component (12); A water-phase impregnation device (2) and an oil-phase coating device (3), both of which are arranged between the unwinding component (11) and the winding component (12), and the water-phase impregnation device (2) is located upstream of the oil-phase coating device (3); The first moisturizing device (4) is arranged between the water phase impregnation device (2) and the oil phase coating device (3). The first moisturizing device (4) is used to moisturize one side of the base film (100) before oil coating, and the oil phase coating device (3) is used to oil the other side of the base film (100) after moisturizing.

2. The polyolefin reverse osmosis membrane processing system according to claim 1, characterized in that: The first moisturizing device (4) comprises a coating roller (41) and a storage tank (42), and the coating roller (41) is used to apply the moisturizing coating in the storage tank (42) to the base film (100).

3. The polyolefin reverse osmosis membrane processing system according to claim 2, characterized in that: The polyolefin reverse osmosis membrane processing system further comprises a metering roller (8), which is used to press the base film (100) against the coating roller (41) and control and meter the amount of coating applied to the base film (100).

4. The polyolefin reverse osmosis membrane processing system according to claim 1, characterized in that: The first moisturizing device (4) comprises a first spraying pipe (43), and the first spraying pipe (43) is used to spray the moisturizing coating onto the base film (100).

5. The polyolefin reverse osmosis membrane processing system according to any one of claims 1 to 4, characterized in that: The distance between the water phase impregnation device (2) and the oil phase coating device (3) is less than 0.5 meters.

6. The polyolefin reverse osmosis membrane processing system according to any one of claims 1 to 4, characterized in that: The distance between the first moisturizing device (4) and the oil phase coating device (3) is 0.1 m to 0.3 m.

7. The polyolefin reverse osmosis membrane processing system according to any one of claims 1 to 4, characterized in that: A drying device (5) is provided between the oil phase coating device (3) and the winding component (12), and the drying device (5) is used to dry the base film (100).

8. The polyolefin reverse osmosis membrane processing system according to claim 7, characterized in that: A second moisturizing device (6) is provided between the oil phase coating device (3) and the drying device (5), and the second moisturizing device (6) is used to moisturize the non-oil-coated surface of the base film (100).

9. The polyolefin reverse osmosis membrane processing system according to claim 8, characterized in that: The second moisturizing device (6) comprises a second spraying pipe, and the second spraying pipe is used to spray the moisturizing coating on the base film (100).

10. The polyolefin reverse osmosis membrane processing system according to claim 1, characterized in that: A pre-soaking tank (7) is provided between the unwinding component (11) and the aqueous phase impregnation device (2), and the pre-soaking tank (7) stores pre-soaked coating.

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