Multi-layer composite separation membrane preparation device

Abstract

The utility model belongs to the technical field of separation membranes, and particularly relates to a multilayer composite separation membrane preparation device which comprises a coagulating basin, a rack, and an unwinding assembly, a plurality of groups of membrane scraping assemblies, a steering roller assembly and a winding assembly which are respectively mounted on the rack. Different groups of membrane scraping assemblies are used for scraping and coating different membrane casting solutions, the mounting position of each scraper relative to a membrane scraping path can be adjusted by adjusting a mounting piece, so that different membrane scraping thicknesses are adjusted, the membrane casting solutions are uniformly coated on a supporting base material in sequence through the scrapers to manufacture multiple layers of composite separation membranes with different functions, and then the composite separation membranes are conveyed into a coagulating basin to be cured into membranes. Finally, the multi-layer composite separation membrane is wound through the winding assembly. By means of the multi-layer composite separation membrane preparation device, multiple separation membranes with different functions can be continuously prepared and combined together to form the multi-layer composite separation membrane.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of separation membrane, and particularly relates to a multilayer composite separation membrane preparation device. BACKGROUND

[0002] The cultivation of viruses usually takes protein as a carrier, and when viruses and protein are separated after complete cultivation, membrane separation technology needs to be used for efficient separation.

[0003] After long-time filtration of common separation membranes, macromolecular compounds such as protein are adsorbed on the surface of the membranes or block the membrane holes, causing membrane pollution, resulting in problems such as reduction of separation membrane flux and poor filtration effect; the combined form of the multilayer composite separation membrane structure can be suitable for the needs of different separation systems, avoid blocking the membrane holes, and prolong the service life of the separation membranes. UTILITY MODEL CONTENTS

[0004] In order to solve the above problems, the application provides a multilayer composite separation membrane preparation device, which can realize one-time and continuous preparation of multilayer composite membranes.

[0005] The utility model provides the following technical scheme: a multilayer composite separation membrane preparation device, comprising: a coagulation tank, a rack, and a pay-off assembly, a plurality of doctor blade assemblies, a deflection roller assembly, and a winding assembly mounted on the rack respectively;

[0006] The pay-off assembly and the winding assembly have a doctor blade path for supporting the base material to move from back to front in sequence, the top of the coagulation tank is provided with a coagulation cavity for containing a coagulation bath, and the pay-off assembly, the plurality of doctor blade assemblies, and the winding assembly are all arranged above the coagulation tank;

[0007] The plurality of doctor blade assemblies and the deflection roller assembly are sequentially and spacedly arranged along the doctor blade path from back to front, the doctor blade path passes through the coagulation cavity along the deflection roller assembly, and the plurality of doctor blade assemblies are located on the first side of the doctor blade path.

[0008] The doctor blade assembly comprises a mounting member and a doctor blade, the doctor blade is mounted on the rack through the mounting member, and the mounting position of the doctor blade can be adjusted through the mounting member, so as to adjust the gap between the doctor blade and the doctor blade path.

[0009] Preferably, the doctoring path comprises a first section, the first section being horizontally arranged, and at least part of the doctoring assemblies are correspondingly arranged above the first section.

[0010] The multi-layer composite separation membrane preparation device further comprises a support table, the support table being correspondingly arranged below the first section, and a support surface of the support table being horizontally arranged.

[0011] Preferably, the doctoring path further comprises a second section in front of the first section, the second section being vertically arranged, and a group of the doctoring assemblies are correspondingly arranged on one side of the second section.

[0012] Preferably, at least two groups of the doctoring assemblies are correspondingly arranged above the first section, and the doctoring assemblies correspondingly arranged above the first section are defined as first doctoring assemblies.

[0013] The horizontal spacing between the first doctoring assemblies is adjustable.

[0014] Preferably, the turning roller assembly comprises a first turning roller, a second turning roller and a third turning roller, all of which are located on the second side of the doctoring path, the first turning roller is horizontally spaced on one side of the support table, the second turning roller is vertically spaced below the first turning roller, and the second turning roller and the third turning roller are spaced in the solidification cavity.

[0015] The second section is defined between the first turning roller and the second turning roller.

[0016] Preferably, the unwinding assembly comprises an unwinding roller and a winding roller, which are sequentially arranged from back to front along the doctoring path.

[0017] Preferably, the winding assembly comprises a substrate winding roller for winding the substrate and a composite separation membrane winding roller for winding the multi-layer composite separation membrane.

[0018] Preferably, the doctoring assembly comprises a casting solution tank, the casting solution tank being mounted on the doctor blade, and the doctor blade being capable of guiding the casting solution in the casting solution tank to the doctoring path.

[0019] Preferably, the doctoring assembly comprises a constant temperature assembly, the constant temperature assembly being connected with the casting solution tank to control the temperature of the casting solution in the casting solution tank.

[0020] Compared with the prior art, the present application has the following beneficial effects:

[0021] The different groups of film scraping assemblies scrape different casting solutions, the mounting positions of the respective doctor blades relative to the film scraping path are adjusted by adjusting the mounting pieces, thereby adjusting different film scraping thicknesses, the casting solutions are uniformly coated on the support substrate by the doctor blades in sequence, a multi-layer composite separation film with different functions is made, the multi-layer composite separation film is sent into the solidification tank to be solidified into a film, and finally the multi-layer composite separation film is wound by the winding assembly. The application can continuously and uninterruptedly scrape the film on the support substrate, and realizes the combination of multiple separation films with different functions. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 A schematic view of a multi-layer composite separation film preparation device of the application is shown in the figure.

[0023] In the figure:

[0024] 1, unwinding assembly; 11, unwinding roller; 12, winding roller; 2, film scraping assembly; 21, mounting piece; 22, doctor blade; 23, casting solution tank; 24, constant temperature assembly; 25, first film scraping assembly; 26, second film scraping assembly; 3, support table; 31, support surface; 4, deflection roller assembly; 41, first deflection roller; 42, second deflection roller; 43, third deflection roller; 5, solidification tank; 51, solidification cavity; 6, winding assembly; 61, substrate winding roller; 62, composite separation film winding roller; 7, rack; 8, support substrate; 9, film scraping path; 91, first section; 92, second section. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the application.

[0026] In the description of the embodiments of the application, it should be noted that the terms “center”, “upper”, “lower”, “left”, “right”, “vertical”, “horizontal”, “inner”, “outer” and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the application. In addition, the terms “first”, “second”, “third” are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0027] In the description of the embodiments of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "mounting", "connecting", "connecting" should be understood in a broad sense, for example, it can be fixedly connected, or it can be replaceably connected, or it can be integrally connected, it can be mechanically connected, or it can be electrically connected, it can be directly connected, or it can be indirectly connected through an intermediate medium, it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0028] In combination Figure 1 As shown in the drawings, a multilayer composite separation membrane preparation device comprises a coagulation tank 5, a rack 7, and a unwinding assembly 1, a plurality of blade coating assemblies 2, a deflection roller assembly 4, and a winding assembly 6 mounted on the rack 7 respectively; there is a blade coating path 9 for supporting the substrate 8 to move from back to front between the unwinding assembly 1 and the winding assembly 6, the top of the coagulation tank 5 is provided with a coagulation cavity 51 for containing coagulation bath, the unwinding assembly 1, a plurality of blade coating assemblies 2 and the winding assembly 6 are all arranged above the coagulation tank 5; a plurality of blade coating assemblies 2 and the deflection roller assembly 4 are sequentially and spaced apart from back to front along the blade coating path 9, the blade coating path 9 passes through the coagulation cavity 51 along the deflection roller assembly 4, and a plurality of blade coating assemblies 2 are located on the first side of the blade coating path 9; the blade coating assembly 2 comprises a mounting piece 21 and a doctor blade 22, the doctor blade 22 is mounted on the rack 7 through the mounting piece 21, and the mounting position of the doctor blade 22 can be adjusted by adjusting the mounting piece 21, thereby adjusting the gap between the doctor blade 22 and the blade coating path 9.

[0029] The supporting substrate 8 can refer to the substrate commonly used by those skilled in the art, such as PTFE, PE, PET, PP and the like, or it can be a non-woven fabric. Using different supporting substrates 8 has an impact on the membrane holes of the prepared separation membrane. In the present embodiment, the supporting substrate 8 is one of PTFE, PE, PET, PP and the like, two or three blade coating assemblies 2 are arranged to scrape different casting solutions onto the supporting substrate 8, the gap between the doctor blade 22 of each blade coating assembly 2 and the blade coating path 9 can be flexibly adjusted by adjusting the mounting piece 21, specifically, the distance between the doctor blade 22 and the supporting substrate 8 can be flexibly adjusted to control the film thickness of different casting solutions on the supporting substrate 8, so that each doctor blade 22 gradually increases the distance from the supporting substrate 8 according to the order of blade coating, and finally two or three layers of composite separation membranes are prepared. Exemplarily, there are three blade coating assemblies 2, according to the order of blade coating, by adjusting the mounting piece 21, the distance between the first blade coating assembly 2 and the supporting substrate 8 is 50-200 μm, the distance between the second blade coating assembly 2 and the supporting substrate 8 is 100-300 μm, and the distance between the third blade coating assembly 2 and the supporting substrate 8 is 150-500 μm.

[0030] The preparation process of the multilayer composite separation membrane is as follows: the unwinding assembly 1 unwinds the support base material 8 to below the doctor blades 22 of the respective groups of doctor blade assemblies 2, the doctor blade assemblies 2 respectively and uniformly coat different casting solutions on the support base material 8, then the support base material 8 is sent into the coagulation bath of the coagulation tank 5 through the turning roller assembly 4, the coated support base material 8 is solidified into a film through the heat treatment of the coagulation bath, and the different casting solutions make the film have different functions, forming a multilayer composite separation membrane, and finally the formed multilayer composite separation membrane is wound out of the coagulation bath.

[0031] The multilayer composite separation membrane prepared by using the multilayer composite separation membrane preparation device of the present application has multiple functions compared with the separation membrane of the prior art, can effectively solve the problem of serious loss of additives of the separation membrane, and effectively ensures the long-term stability of the separation membrane during use; the doctor blades 22 of the groups of doctor blade assemblies 2 can simultaneously perform continuous doctoring on the support base material 8, thereby improving the production efficiency of the multilayer composite separation membrane.

[0032] Further, the doctoring path 9 comprises a first section 91, the first section 91 is horizontally arranged, and at least part of the doctor blade assemblies 2 are correspondingly arranged above the first section 91; the multilayer composite separation membrane preparation device further comprises a support table 3, the support table 3 is correspondingly arranged below the first section 91, and a surface of the support table 3 facing the doctoring path 9 is a support surface 31, the support surface 31 is horizontally arranged.

[0033] In the embodiment, three groups of doctor blade assemblies 2 are arranged above the first section 91, the casting solutions coated by the three groups of doctor blade assemblies 2 are all casting solutions with high viscosity, the support base material 8 coming out of the unwinding assembly 1 is laid on the support surface 31, the height between each group of doctor blades 22 and the support base material 8 is adjusted by adjusting the mounting member 21, so as to control the doctoring thickness of the support base material 8 by each group of doctor blade assemblies 2, the doctor blades 22 of the three groups of doctor blade assemblies 2 can simultaneously perform doctoring on the support base material 8, and the casting solution can be uniformly combined with the support base material 8 on the support surface 31.

[0034] Further, the doctoring path 9 further comprises a second section 92 located in front of the first section 91, the second section 92 is vertically arranged, and one group of doctor blade assemblies 2 is correspondingly arranged on one side of the second section 92.

[0035] In the embodiment, two groups of doctor blade assemblies 2 with casting solutions with high viscosity are arranged above the first section 91, and one group of doctor blade assemblies 2 with casting solutions with low viscosity is correspondingly arranged on one side of the second section 92, the position of the doctor blade assembly 2 is optimized and adjusted for the casting solution with low viscosity, so as to avoid the low-viscosity casting solution from spreading everywhere on the horizontal plane and affecting the film forming effect. Exemplarily, the doctor blade assembly 2 located on one side of the second section 92 is arranged at an angle of 45° with the vertical direction.

[0036] Further, at least two groups of the film scraping assemblies 2 are arranged above the first section 91, and the film scraping assemblies arranged above the first section 91 are defined as first film scraping assemblies 25. The horizontal spacing between the first film scraping assemblies 25 can be adjusted.

[0037] By adjusting the spacing between the film scraping assemblies 2, the contact time of each layer of the casting solution with air after the support substrate 8 is scraped by the film scraping assemblies 2 is controlled, so as to adjust the pore size of the separation membrane. The film scraping assemblies arranged on one side of the second section 92 are defined as second film scraping assemblies 26. By adjusting the horizontal displacement of the first film scraping assemblies 25, that is, adjusting the spacing between the first film scraping assemblies 25 and the second film scraping assemblies 26, the contact time of the support substrate 8 with air before the support substrate 8 reaches the second film scraping assemblies 26 after passing through the first film scraping assemblies 25 can be adjusted.

[0038] Further, the turning roller assembly 4 includes a first turning roller 41, a second turning roller 42, and a third turning roller 43, which are all located on the second side of the film scraping path 9. The first turning roller 41 is arranged on one side of the support table 3 in a horizontal direction. The second turning roller 42 is arranged below the first turning roller 41 in a vertical direction. The second turning roller 42 and the third turning roller 43 are arranged in the solidification cavity 51.

[0039] The second section 92 is defined between the first turning roller 41 and the second turning roller 42.

[0040] In the embodiment, the top of the first turning roller 41 is flush with the top of the support table 3. The second turning roller 42 and the third turning roller 43 are arranged in a horizontal direction, so that the support substrate 8 is sequentially guided through the support table 3 and the first turning roller 41, and then enters the solidification tank 5, and is sequentially guided through the second turning roller 42 and the third turning roller 43, and is fully solidified in the solidification bath. Finally, the completed multilayer composite separation membrane is taken out of the solidification bath and is wound by the winding assembly 6. The support substrate 8 is effectively guided into the solidification tank 5 to be solidified into a film.

[0041] Further, the unwinding assembly 1 includes an unwinding roller 11 and a pressing roller 12 arranged in sequence from back to front along the film scraping path 9. The unwinding roller 11 is used to fix the placed support substrate 8, and unwinds the support substrate 8 to the pressing roller 12. The pressing roller 12 flattens the support substrate 8 and then sends it to the support table 3, so that the support substrate 8 passes through the doctor blade 22 smoothly, which helps to achieve better film scraping effect.

[0042] Further, the winding assembly 6 comprises a substrate winding roller 61 for winding the support substrate 8 and a composite separation film winding roller 62 for winding the multilayer composite separation film. After the support substrate 8 is treated by the coagulation bath, it is divided into two parts, one part is the film body with the multilayer composite separation film, which is wound by the composite separation film winding roller 62, and the remaining part is the support substrate 8, which is wound by the substrate winding roller 61. In this way, the multilayer composite separation film can be more conveniently collected as a finished product. In actual cases, for the case where the support substrate 8 can be combined with the composite separation film, for example, when the support substrate 8 is a non-woven fabric, the winding of the non-woven fabric and the composite separation film can be completed by the same winding roller.

[0043] Further, the film scraping assembly 2 comprises a casting solution tank 23, which is installed on the doctor blade 22, and the doctor blade 22 can guide the casting solution in the casting solution tank 23 to the film scraping path 9. The casting solution tank 23 is used to store various prepared casting solutions, and the casting solution in the casting solution tank 23 flows to the surface of the support substrate 8 when the doctor blade 22 scrapes the support substrate 8.

[0044] In order to better preserve the casting solution and ensure the film scraping effect of the film scraping assembly 2 on the support substrate 8, further, the film scraping assembly 2 comprises a constant temperature assembly 24 connected to the casting solution tank 23 to control the temperature of the casting solution in the casting solution tank 23. Each casting solution tank 23 is adjusted to the most suitable use temperature of the casting solution therein, and the doctor blade 22 scrapes the casting solution with a certain temperature to the support substrate 8, which is beneficial to the successful film formation of the corresponding casting solution on the support substrate 8.

[0045] In summary, in some embodiments, two groups of film scraping assemblies 2 are arranged directly above the first section 91, a mixture of polyether sulfone, polymer additive, polyethylene glycol, diethylene glycol, and dimethylformamide is made into a first casting solution and placed in the first film scraping assembly 25 for the first film scraping, and the film scraping thickness is adjusted to 140 μm, a mixture of polyether sulfone, polymer additive, polyethylene glycol, glycerol, and dimethylacetamide is made into a second casting solution and placed in the first film scraping assembly 25 for the second film scraping, and the film scraping thickness is adjusted to 220 μm, and the remaining film scraping assemblies 2 are adjusted to the highest position from the support substrate 8, a coagulation bath of 50°C pure water is used, the drawing speed of the support substrate 8 is controlled to be 7 m / min, the support substrate 8 is PET, and after the coagulation bath, a two-layer composite separation film is obtained.

[0046] In some embodiments, two groups of the film-wiping assemblies 2 are arranged above the first section 91, and one group of the film-wiping assemblies 2 is arranged on one side of the second section 92. For example, a mixture of polyethersulfone, polymer additives, glycerol, ethylene glycol, and dimethylacetamide is prepared as a first casting solution and is placed in the first film-wiping assembly 25 for the first film-wiping, and the film-wiping thickness is adjusted to 100 μm. A mixture of polyethersulfone, polymer additives, propylene glycol, and dimethylacetamide is prepared as a second casting solution and is placed in the first film-wiping assembly 25 for the second film-wiping, and the film-wiping thickness is adjusted to 200 μm. A mixture of polyethersulfone, polymer additives, glycerol, triethylene glycol, and dimethylacetamide is prepared as a third casting solution and is placed in the second film-wiping assembly 26, and the film-wiping thickness is adjusted to 300 μm. The pure water at 40°C is used as a coagulation bath, the drawing speed of the support base 8 is controlled to be 7 m / min, and the support base 8 is PP. After passing through the coagulation bath, a three-layer composite separation membrane is obtained.

[0047] This specification discloses the present application with reference to the accompanying drawings, and also enables those skilled in the art to implement the present application, including manufacturing and using any device or system, using appropriate materials, and using any combined method. The scope of the present application is defined by the claimed technical solutions, and includes other examples thought by those skilled in the art. As long as such other examples include structural elements not different from the literal language of the claimed technical solutions, or such other examples contain equivalent structural elements not substantially different from the literal language of the claimed technical solutions, such other examples should be considered to be within the protection scope determined by the claimed technical solutions of the present application.

Claims

1. A multilayer composite separation membrane preparation apparatus, characterized in that, The device comprises a coagulation tank, a rack, and a unwinding assembly, a plurality of doctor blade assemblies, a deflection roller assembly, and a winding assembly respectively installed on the rack. The doctor blade path is provided between the unwinding assembly and the winding assembly for sequentially moving the support substrate from back to front, and the top of the coagulation tank is provided with a coagulation cavity for containing a coagulation bath. The doctor blade assemblies and the deflection roller assembly are sequentially and spacedly arranged along the doctor blade path from back to front, and the doctor blade path passes through the coagulation cavity along the deflection roller assembly. The doctor blade assembly comprises a mounting member and a doctor blade, the doctor blade is installed on the rack through the mounting member, and the installation position of the doctor blade can be adjusted by adjusting the mounting member, so as to adjust the gap between the doctor blade and the doctor blade path. The doctor blade path comprises a first section arranged horizontally, and at least part of the doctor blade assemblies are arranged above the first section.

2. The multi-layer composite separation membrane preparation device according to claim 1, characterized by, The device further comprises a support table arranged below the first section, and the support surface of the support table facing the doctor blade path is arranged horizontally. The doctor blade path further comprises a second section arranged vertically in front of the first section, and one of the doctor blade assemblies is arranged on one side of the second section.

3. The multi-layer composite separation membrane preparation device according to claim 2, characterized by At least two of the doctor blade assemblies are arranged above the first section, and the doctor blade assemblies arranged above the first section are defined as first doctor blade assemblies.

4. The multi-layer composite separation membrane preparation device according to claim 3, characterized by The horizontal distance between the first doctor blade assemblies can be adjusted. The deflection roller assembly comprises a first deflection roller, a second deflection roller, and a third deflection roller all arranged on the second side of the doctor blade path, the first deflection roller is arranged horizontally on one side of the support table, the second deflection roller is arranged vertically below the first deflection roller, and the second deflection roller and the third deflection roller are arranged in the coagulation cavity.

5. The apparatus for preparing a multilayer composite separation membrane according to claim 3, wherein The second section is defined between the first deflection roller and the second deflection roller. The unwinding assembly comprises an unwinding roller and a pressing roller arranged sequentially along the doctor blade path from back to front.

6. The multi-layer composite separation membrane preparation apparatus according to claim 1, wherein The winding assembly comprises a support substrate winding roller for winding the support substrate and a composite separation membrane winding roller for winding the composite separation membrane.

7. The apparatus for preparing a multilayer composite separation membrane according to claim 1, wherein The doctor blade assembly comprises a casting solution tank installed on the doctor blade, and the doctor blade can guide the casting solution in the casting solution tank to the doctor blade path.

8. The apparatus for preparing a multilayer composite separation membrane according to claim 1, wherein The doctor blade assembly comprises a constant temperature assembly connected with the casting solution tank to control the temperature of the casting solution in the casting solution tank.

9. The apparatus for preparing a multilayer composite separation membrane according to claim 8, wherein ​

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