CN114515512A - Hydrophilic polyvinylidene fluoride nanofiltration membrane and preparation method thereof - Google Patents
Hydrophilic polyvinylidene fluoride nanofiltration membrane and preparation method thereof Download PDFInfo
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- CN114515512A CN114515512A CN202210340588.XA CN202210340588A CN114515512A CN 114515512 A CN114515512 A CN 114515512A CN 202210340588 A CN202210340588 A CN 202210340588A CN 114515512 A CN114515512 A CN 114515512A
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- 239000012528 membrane Substances 0.000 title claims abstract description 121
- 239000002033 PVDF binder Substances 0.000 title claims abstract description 32
- 229920002981 polyvinylidene fluoride Polymers 0.000 title claims abstract description 32
- 238000001728 nano-filtration Methods 0.000 title claims abstract description 26
- 238000002360 preparation method Methods 0.000 title claims abstract description 10
- 239000000463 material Substances 0.000 claims abstract description 69
- 238000000034 method Methods 0.000 claims abstract description 22
- 230000006835 compression Effects 0.000 claims abstract description 16
- 238000007906 compression Methods 0.000 claims abstract description 16
- 238000004806 packaging method and process Methods 0.000 claims abstract description 11
- 238000007493 shaping process Methods 0.000 claims abstract description 6
- 238000005538 encapsulation Methods 0.000 claims abstract description 4
- 238000003825 pressing Methods 0.000 claims description 9
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 229920001477 hydrophilic polymer Polymers 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 4
- 229910001870 ammonium persulfate Inorganic materials 0.000 claims description 3
- 239000006185 dispersion Substances 0.000 claims description 3
- 239000005457 ice water Substances 0.000 claims description 3
- 238000010030 laminating Methods 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 3
- 229920000767 polyaniline Polymers 0.000 claims description 3
- 229920000642 polymer Polymers 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 239000000758 substrate Substances 0.000 claims description 3
- 238000005406 washing Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 10
- 238000001914 filtration Methods 0.000 abstract description 10
- 238000005096 rolling process Methods 0.000 description 8
- 238000001514 detection method Methods 0.000 description 3
- -1 polypropylene Polymers 0.000 description 3
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 2
- 239000004810 polytetrafluoroethylene Substances 0.000 description 2
- QNRATNLHPGXHMA-XZHTYLCXSA-N (r)-(6-ethoxyquinolin-4-yl)-[(2s,4s,5r)-5-ethyl-1-azabicyclo[2.2.2]octan-2-yl]methanol;hydrochloride Chemical compound Cl.C([C@H]([C@H](C1)CC)C2)CN1[C@@H]2[C@H](O)C1=CC=NC2=CC=C(OCC)C=C21 QNRATNLHPGXHMA-XZHTYLCXSA-N 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 239000004695 Polyether sulfone Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 229920006393 polyether sulfone Polymers 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
- B01D61/02—Reverse osmosis; Hyperfiltration ; Nanofiltration
- B01D61/027—Nanofiltration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D67/00—Processes specially adapted for manufacturing semi-permeable membranes for separation processes or apparatus
- B01D67/0081—After-treatment of organic or inorganic membranes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D67/00—Processes specially adapted for manufacturing semi-permeable membranes for separation processes or apparatus
- B01D67/0081—After-treatment of organic or inorganic membranes
- B01D67/0093—Chemical modification
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D69/00—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
- B01D69/02—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor characterised by their properties
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
- B01D71/06—Organic material
- B01D71/30—Polyalkenyl halides
- B01D71/32—Polyalkenyl halides containing fluorine atoms
- B01D71/34—Polyvinylidene fluoride
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2325/00—Details relating to properties of membranes
- B01D2325/36—Hydrophilic membranes
Abstract
The invention belongs to the technical field of filter membrane processing, and particularly relates to a hydrophilic polyvinylidene fluoride nanofiltration membrane and a preparation method thereof; the filter element aims to solve the problem of poor filtering effect caused by the fact that the seriously damaged part of the membrane material of the traditional folding filter element can not be detached; the method comprises the following steps: the method comprises the following steps: preparing a hydrophilic polyvinylidene fluoride membrane material; step two: leveling the membrane material by using filter element packaging equipment; step three: stacking and wrapping a plurality of membrane materials on the outer side of the disassembling module to form a nanofiltration membrane; filter core encapsulation equipment includes the flattening base station, changes roller and compression roller, install L type arm and a plurality of roll-in seat on the flattening base station, rotate on the flattening base station and be connected with a plurality of accepting rollers, install on the roll-in seat and change roller and compression roller, the multiunit changes roller and compression roller and compresses tightly the membrane material, and sliding connection has on the L type arm to be used for pushing up the tight shaping clamp plate with the membrane material that struts.
Description
Technical Field
The invention belongs to the technical field of filter membrane processing, and particularly relates to a hydrophilic polyvinylidene fluoride nanofiltration membrane and a preparation method thereof.
Background
Often use the foldable filter core of micropore in the filtration equipment, its main filtration material includes: stainless steel wire mesh, sintered mesh, polypropylene, hydrophobic polytetrafluoroethylene, hydrophilic polytetrafluoroethylene, polyethersulfone, nylon and the like, wherein most raw materials are imported from foreign countries; and the membrane material of common folding filter core product damages the unable separation of more serious part, can influence the filter effect in the follow-up use, and wherein polyvinylidene fluoride membrane has resistant pH value wide range, is good gas, the filterable millipore filtration membrane of organic liquid, makes hydrophilicity polyvinylidene fluoride membrane material through polyvinylidene fluoride base membrane body and the hydrophilic polymer of polymerization on polyvinylidene fluoride base membrane body to with membrane material stack-up mounting dismantle the module outside, can improve the performance of filter membrane.
Disclosure of Invention
In order to solve the problem of poor filtering effect caused by the fact that the seriously damaged part of the membrane material of the traditional folding filter element cannot be detached, the invention adopts the following technical scheme:
the invention provides a hydrophilic polyvinylidene fluoride nanofiltration membrane and a preparation method thereof, and the preparation method comprises the following steps:
a: putting the modified ECIP/PVA/PANI dispersion liquid into a beaker, putting the beaker into an ice water bath, vertically putting a cleaned substrate fixed with a polyvinylidene fluoride basal membrane into the beaker, and stirring while adding an ammonium persulfate solution after the temperature is constant at 0 ℃;
b: after the reaction is finished, washing away the reaction solution and the polymer particles adhered to the surface of the polyvinylidene fluoride base membrane, and airing to obtain a hydrophilic polyvinylidene fluoride membrane material;
c: leveling the membrane material by using filter element packaging equipment;
d: and (4) laminating and wrapping a plurality of membrane materials outside the disassembling module to form a nanofiltration membrane.
Filter core encapsulation equipment includes membrane material, flattening base station, accepting roller, L type arm, shaping clamp plate, roll-in seat, changes roller and compression roller, install L type arm and a plurality of roll-in seat on the flattening base station, rotate on the flattening base station and be connected with a plurality of accepting rollers, install on the roll-in seat and change roller and compression roller, the multiunit changes roller and compression roller and compresses tightly the membrane material, and sliding connection has on the L type arm to be used for carrying out the tight shaping clamp plate in top with the membrane material that struts.
The disassembly module comprises module plates, connecting arc plates and embedded plates, the embedded plates are installed on the module plates, the membrane is installed on the disassembly module through the embedded plates, the module plates are fixedly connected in a detachable mode, and the module plates on the two sides are connected through the connecting arc plates at the end portions.
The membrane material of the nanofiltration membrane comprises a polyvinylidene fluoride-based membrane body and a hydrophilic polymer polymerized on the polyvinylidene fluoride-based membrane body.
Drawings
The following drawings are only intended to illustrate and explain the invention schematically, wherein:
fig. 1 is a flow chart of a preparation method of a hydrophilic polyvinylidene fluoride nanofiltration membrane according to the present invention;
FIG. 2 is a schematic structural view of a membrane and a module board according to the present invention;
FIG. 3 is a schematic structural diagram of a detaching module according to the present invention;
FIG. 4 is a schematic view of the cartridge packaging apparatus of the present invention;
FIG. 5 is a schematic view of the leveling base and the receiving roller according to the present invention;
FIG. 6 is a schematic structural view of a rolling seat, a rotary roller and a limit strip of the present invention;
FIG. 7 is a schematic structural view of a stopper bar of the present invention;
FIG. 8 is a schematic structural view of a connecting arc plate and a fitting plate according to the present invention;
FIG. 9 is a schematic structural view of the positioning plate, the end cap, the clamping post and the tightening rim of the present invention;
FIG. 10 is a schematic view of the structure of the adjusting arm, the filter membrane supporting plate and the positioning frame of the present invention;
FIG. 11 is a schematic view of the construction of the sleeve and spacer of the present invention;
fig. 12 is a schematic structural view of the V-groove of the present invention.
Detailed Description
Specific examples of the present invention will be explained below.
A preparation method of a hydrophilic polyvinylidene fluoride nanofiltration membrane comprises the following steps:
a: putting the modified ECIP/PVA/PANI dispersion liquid into a beaker, putting the beaker into an ice water bath, vertically putting a cleaned substrate fixed with a polyvinylidene fluoride basal membrane into the beaker, and stirring while adding an ammonium persulfate solution after the temperature is constant at 0 ℃;
b: after the reaction is finished, washing away the reaction solution and the polymer particles adhered to the surface of the polyvinylidene fluoride base membrane, and airing to obtain a hydrophilic polyvinylidene fluoride membrane material;
c: leveling the membrane material by using filter element packaging equipment;
d: and (4) laminating and wrapping a plurality of membrane materials outside the disassembling module to form a nanofiltration membrane.
The filter element packaging equipment can level the membrane material, so that a nanofiltration membrane can be conveniently formed by a plurality of membrane materials, and the problem that the filtering effect cannot be achieved by a single membrane material is solved;
the module is dismantled in the utilization, is convenient for solve the membrane material of traditional folding filter core and damages the problem that the filter effect is poor that the more serious part can't be pulled apart and lead to.
The membrane material of the nanofiltration membrane comprises a polyvinylidene fluoride-based membrane body and a hydrophilic polymer polymerized on the polyvinylidene fluoride-based membrane body.
See fig. 2 and fig. 4-6 for an illustration:
filter core encapsulation equipment includes membrane material 1, flattening base station 21, accepting roller 22, L type arm 23, shaping clamp plate 24, roll-in seat 31, changes roller 32 and compression roller 35, fixedly connected with L type arm 23 and a plurality of roll-in seat 31 on the flattening base station 21 rotate on the flattening base station 21 and be connected with accepting roller 22, accepting roller 22 is provided with a plurality ofly, and a plurality of accepting roller 22's upside is the arc orbit, installs on the roll-in seat 31 and changes roller 32 and compression roller 35, changes roller 32 and rotates and connect on roll-in seat 31, and multiunit compression roller 35 and commentaries on classics roller 32 can compress tightly membrane material 1, and sliding connection has the shaping clamp plate 24 that is used for carrying out the tight in top with the membrane material 1 that struts on the L type arm 23.
One side of the plurality of rotary rollers 32 and the press roller 35 is open, the film material 1 can be sleeved between the plurality of rotary rollers 32 and the press roller 35 from the side, then the press roller 35 is moved, the press roller 35 and the rotary rollers 32 are matched to press two sides of the film material 1, and the press roller 35 is rotated, so that the effects of pressing and conveying the film material 1 are realized;
at the moment, the compression roller 35 and the rotating roller 32 can respectively control the rotation of the compression roller and the rotating roller through the motor I and the motor II;
the surface flatness of the film material 1 is improved under the action of the press roll 35 and the rotating roll 32, the length of the film material is lengthened, then the hanging part is received by the receiving roll 22, the press rolls 35 are rotated at different speeds, and the stretched film material 1 is tightly pressed by the forming press plate 24;
the L-shaped arm 23 is fixedly connected with a hydraulic cylinder I for driving the forming press plate 24 to slide on the L-shaped arm 23; the molding pressing plate 24 is rhombic, so that the shape of one side of the tightly-supported membrane material 1 can be matched with the size of the disassembly module, and the membrane material 1 is conveniently coated on the outer side of the disassembly module integrally.
See FIGS. 2-3 for an illustration:
a plurality of membrane materials 1 connected end to end are stacked and installed to form the nanofiltration membrane.
The nanofiltration membrane is formed by overlapping and sleeving a plurality of membrane materials 1 which are connected end to end, and the problem that a single membrane material cannot achieve the filtering effect is solved.
See FIGS. 5-7 for illustration:
the filter element packaging equipment further comprises a sliding frame 34, a moving arm 36 and a driving seat 37, wherein the sliding frame 34 is connected to the rolling seat 31 in a sliding mode, the pressing roller 35 is installed on the rolling seat 31 through the sliding frame 34, the moving arm 36 is connected with the sliding frame 34 in a rotating mode, the moving arm 36 is connected to the driving seat 37 in a sliding mode, and the rolling seat 31 is fixedly connected with the driving seat 37.
The moving arm 36 is connected to the driving seat 37 in a sliding manner through a sliding rail, and a hydraulic cylinder II for driving the moving arm 36 to slide on the driving seat 37 is fixedly connected to the driving seat 37;
starting a hydraulic cylinder II, enabling the moving arm 36 to drive the sliding frame 34 to slide on the rolling seat 31, and enabling the pressing roller 35 to press the film material 1 to the rotating roller 32;
a motor I fixed connection for driving the compression roller 35 and use the axis of self as the axle and rotate is on moving arm 36, enables balladeur train 34 through starter motor I and drives compression roller 35 and rotate.
See fig. 2-3 and fig. 8 for an illustration:
the disassembly module comprises module plates 11, connecting arc plates 12 and embedded plates 13, the embedded plates 13 are fixedly connected to the module plates 11, the membrane material 1 is installed on the disassembly module through the embedded plates 13, the module plates 11 are detachably and fixedly connected with one another, and the module plates 11 on two sides are connected with one another through the connecting arc plates 12 at the end portions.
The membrane material 1 is arranged on the disassembling module through the embedded plate 13, and the membrane material 1 is corrugated under the action of the disassembling module, so that the surface area of the nanofiltration membrane is increased; by changing the telescopic performance of the membrane material 1 at different positions, the membrane material 1 has different filtering performances at different positions, so that the multi-stage filtration is realized, and meanwhile, the filter membrane product is convenient to disassemble;
furthermore, the module plates 11 are detachably and fixedly connected with each other, so that the detection and maintenance of the inner side of the nanofiltration membrane can be facilitated;
in the nanofiltration membrane working process, the plurality of groups of disassembling modules are staggered and used together.
See fig. 2 and fig. 9-10 for an illustration:
the filter element packaging equipment further comprises a positioning plate 14 and an end cover 15, the positioning plate 14 and the end cover 15 are installed between the module plates 11 on the two sides, the positioning plate 14 penetrates through the module plates 11 and the embedded plate 13, the end covers 15 are respectively detachably and fixedly connected to the two sides of the positioning plate 14, and the two end covers 15 are respectively buckled on the outer sides of the module plates 11 on the two sides.
The use of locating plate 14 and end cover 15 can separate membrane material 1 on dismantling the module, makes the part of membrane material 1 can disassemble together with dismantling the module, is convenient for solve the membrane material of traditional folding filter core and damages the problem that the filter effect that serious part can't be detached and lead to is poor.
As shown in fig. 9:
the filter element packaging equipment further comprises two clamping columns 16 and a jacking edge 17, wherein the two clamping columns 16 are symmetrically and rotatably connected between the two end covers 15, and the jacking edge 17 is fixedly connected to the clamping columns 16.
The clamping column 16 is rotated, so that the jacking edge 17 can tightly press the membrane material 1 to the positioning plate 14, and the effect of separating the membrane material 1 on the disassembly module is improved.
As shown in fig. 2:
a plurality of module boards 11 are two by two a set of, and module board 11 between every group can be dismantled.
Can dismantle between every group module board 11, utilize the top tightly to compress tightly membrane material 1 to locating plate 14 back along 17, a plurality of independent spaces are separated into with membrane material 1 to multiunit module board 11, when dismantling the module, can be convenient for pull down the great part membrane material 1 of loss on the whole, can solve the membrane material of traditional folding filter core like this and damage the problem that the filter effect is poor that can't detach the result in of more serious part.
See FIGS. 6-7 for an illustration:
the filter element packaging device further comprises a limiting strip 33, and the rotating roller 32 is fastened on the rolling seat 31 through the limiting strip 33.
The limiting strip 33 presses one side of the rotating roller 32 on the rolling seat 31, so that the rotating roller 32 can be conveniently pulled out of the rolling seat 31, and the convenience of sleeving the film material 1 on the outer side of the disassembling module is improved.
See fig. 2 and fig. 10-12 for an illustration:
the filter element packaging device also comprises a filter membrane performance regulator 41, a vertical column 42, a sleeve 43, a positioning frame 44, a regulating arm 51, a filter membrane supporting plate 52, a positioning frame 53 and a V-shaped groove 54, the filter membrane performance regulator is characterized in that a filter membrane performance regulator 41 is connected to the embedded plate 13 in a sliding mode, two vertical columns 42 are symmetrically and fixedly connected to the filter membrane performance regulator 41, a sleeve 43 is fixedly connected to the filter membrane performance regulator 41, the other end of the sleeve 43 is connected with a positioning frame 44, the positioning frame 44 is connected to the two vertical columns 42 in a sliding mode, two adjusting arms 51 are connected to the positioning frame 44 in a sliding mode, the two adjusting arms 51 are installed oppositely, a filter membrane supporting plate 52 is fixedly connected to the adjusting arms 51, the filter membrane supporting plate 52 is in contact fit with the middle of the inner side of the membrane material 1, the positioning frame 53 is fixedly connected to the embedded plate 13, V grooves 54 are symmetrically formed in two sides of the positioning frame 53, and positioning columns on the adjusting arms 51 are connected to the V grooves 54 in a sliding mode.
The inner side of the membrane material 1 is provided with a detection strip, and the distance between the grids on the detection strip is changed according to the elongation degree of the membrane material 1, so that the deformation degree of the membrane material 1 can be observed conveniently;
sliding the filter membrane performance regulator 41 on the outer side of the end cover 15, so that the positioning frame 44 drives the positioning column on the adjusting arm 51 to slide in the V-shaped groove 54 in the moving process, and thus the two filter membrane supporting plates 52 can support the middle part of the inner side of the membrane material 1 to change the filtration performance of the filter membrane;
the telescoping structures on the sleeves 43 are positioned by fasteners to accommodate different sizes of modular plates 11;
the positioning frame 53 is provided with a sliding groove for the vertical column 42 to slide, so that the stability of the filter membrane performance regulator 41 in the moving process can be improved.
Claims (10)
1. A preparation method of a hydrophilic polyvinylidene fluoride nanofiltration membrane is characterized by comprising the following steps: the method comprises the following steps:
a: putting the modified ECIP/PVA/PANI dispersion liquid into a beaker, putting the beaker into an ice water bath, vertically putting a cleaned substrate fixed with a polyvinylidene fluoride basal membrane into the beaker, and stirring while adding an ammonium persulfate solution after the temperature is constant at 0 ℃;
b: after the reaction is finished, washing away the reaction solution and the polymer particles adhered to the surface of the polyvinylidene fluoride base membrane, and airing to obtain a hydrophilic polyvinylidene fluoride membrane material;
c: leveling the membrane material by using filter element packaging equipment;
d: and (4) laminating and wrapping a plurality of membrane materials outside the disassembling module to form a nanofiltration membrane.
2. The method of claim 1, wherein the method comprises the following steps: filter core encapsulation equipment includes flattening base station (21), changes roller (32) and compression roller (35), install L type arm (23) and a plurality of roll-in seat (31) on flattening base station (21), it has a plurality of accepting roller (22) to rotate on flattening base station (21), installs on roll-in seat (31) and changes roller (32) and compression roller (35), and multiunit changes roller (32) and compression roller (35) and compresses tightly membrane material (1), and sliding connection has on L type arm (23) to be used for carrying out the shaping clamp plate (24) that push up tight with the membrane material (1) that struts.
3. The method of claim 2, wherein the method comprises the following steps: a plurality of membrane materials (1) connected end to end are stacked and installed to form the nanofiltration membrane.
4. The method for preparing a hydrophilic polyvinylidene fluoride nanofiltration membrane according to claim 2, wherein the method comprises the following steps: the roller pressing device is characterized in that a sliding frame (34) is connected onto the roller pressing seat (31) in a sliding mode, a pressing roller (35) is installed on the roller pressing seat (31) through the sliding frame (34), the sliding frame (34) is connected onto a moving arm (36) in a rotating mode, the moving arm (36) is connected onto a driving seat (37) in a sliding mode, and the driving seat (37) is fixedly connected onto the roller pressing seat (31).
5. The method of claim 1, wherein the method comprises the following steps: the disassembly module comprises module plates (11) and embedded plates (13), the embedded plates (13) are installed on the module plates (11), the membrane material (1) is installed on the disassembly module through the embedded plates (13), the module plates (11) are mutually detachably and fixedly connected, and the module plates (11) on two sides are connected through connecting arc plates (12) at the end parts.
6. The method of claim 5, wherein the method comprises the following steps: a positioning plate (14) and an end cover (15) are arranged between the module plates (11) on the two sides, the positioning plate (14) penetrates through the module plates (11) and the embedded plate (13), the end covers (15) are respectively arranged on the two sides of the positioning plate (14), and the end covers (15) are buckled on the outer sides of the module plates (11) on the two sides.
7. The method of claim 6, wherein the method comprises the following steps: two clamping columns (16) are symmetrically and rotatably connected between the two end covers (15), and a jacking edge (17) is fixedly connected to each clamping column (16).
8. The method of claim 7 or 6, wherein the method comprises the following steps: a plurality of module board (11) are two liang one set of, and module board (11) between every group can be dismantled.
9. The method for preparing a hydrophilic polyvinylidene fluoride nanofiltration membrane according to claim 2, wherein the method comprises the following steps: the roller (32) is fastened on the roller seat (31) through a limiting strip (33).
10. The polyvinylidene fluoride nanofiltration membrane prepared by the preparation method of the hydrophilic polyvinylidene fluoride nanofiltration membrane of claim 1, which is characterized in that: the membrane material of the nanofiltration membrane comprises a polyvinylidene fluoride-based membrane body and a hydrophilic polymer polymerized on the polyvinylidene fluoride-based membrane body.
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| CN202210340588.XA CN114515512A (en) | 2022-03-26 | 2022-03-26 | Hydrophilic polyvinylidene fluoride nanofiltration membrane and preparation method thereof |
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| CN202210340588.XA CN114515512A (en) | 2022-03-26 | 2022-03-26 | Hydrophilic polyvinylidene fluoride nanofiltration membrane and preparation method thereof |
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| CN113509843A (en) * | 2021-08-05 | 2021-10-19 | 李金城 | Production process of cascade multilayer efficient composite membrane folding filter element |
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