CN113509843A - Production process of cascade multilayer efficient composite membrane folding filter element - Google Patents
Production process of cascade multilayer efficient composite membrane folding filter element Download PDFInfo
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- CN113509843A CN113509843A CN202110895014.4A CN202110895014A CN113509843A CN 113509843 A CN113509843 A CN 113509843A CN 202110895014 A CN202110895014 A CN 202110895014A CN 113509843 A CN113509843 A CN 113509843A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D63/00—Apparatus in general for separation processes using semi-permeable membranes
- B01D63/14—Pleat-type membrane modules
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- 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
- B01D61/14—Ultrafiltration; Microfiltration
- B01D61/147—Microfiltration
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
- B01D65/003—Membrane bonding or sealing
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Abstract
The invention is suitable for the technical field of membrane folding filter elements, and provides a production process of a cascade multilayer efficient composite membrane folding filter element. The adoption of the tiling of the multiple layers of filtering membranes ensures the dispersive interception, and the coarse filtering membrane also acts as a protective barrier of a subsequent membrane to a certain extent, so that the reliability and the interception rate of the filter can be ensured. The multilayer filter membranes are adopted for tiling, and the interception objects are distributed on the surfaces of the multilayer membranes according to the interception precision, so that the interception load of the rearmost end (the membrane with the highest precision) is effectively reduced, and the service life of the filter can be prolonged to a certain extent.
Description
Technical Field
The invention belongs to the technical field of membrane folding filter elements, and particularly relates to a production process of a cascade layering efficient composite membrane folding filter element.
Background
The prior commonly used membrane folding filter element is basically made of membrane filter materials (commonly used: PP, ptfe, pes and the like), and is packaged into a PP filter cylinder after being folded by a folding machine. The folding film basically adopts the following steps: the microporous membrane filter comprises an upstream supporting layer, a plurality of layers of microporous filter membranes and a downstream supporting layer, wherein the upstream supporting layer and the downstream supporting layer are used for supporting a core action layer for protecting the filtration, namely the plurality of layers of microporous filter membranes, so that the microporous filter membranes are protected from being scratched by sharp particles in upstream substances and are prevented from deforming and stretching downstream. As the existing process adopts one layer of upstream support, one layer of microporous filter membrane and one layer of downstream support, the process determines that the reliability of the product is very weak, and once any one layer is damaged, the subsequent follow-up membrane layer is possibly damaged, thereby causing the failure of the filter. Therefore, the filtering quality of the filtering using link is seriously reduced, and further, the product quality is seriously influenced.
The invention is based on the conditions that the traditional single-layer film production process has low reliability, and particles with large and small apertures are all gathered on the same interception surface and are easy to be completely blocked due to single-layer interception. A production process of the cascade multilayer high-efficiency filter is designed, namely, a plurality of filtering membranes with different precisions are adopted to carry out multilayer membrane dispersion filtration according to the sequence from coarse (the filtering aperture is coarse) to fine, so that the filter has good filtering flux, safe and reliable interception efficiency and longer service life than the traditional single-layer membrane process.
Disclosure of Invention
The invention provides a production process of a cascade layering efficient composite membrane folding filter element, and aims to solve the problems that the traditional single-layer membrane production process is low in reliability, and particles with large and small pore diameters are all gathered on the same interception surface and are easily and completely blocked due to single-layer interception.
The invention is realized in this way, a production process of a cascade layering high-efficiency composite membrane folding filter element, which comprises the following steps:
the method comprises the following steps: the method comprises the following steps of (1) flatly paving a plurality of layers of filtering membranes with different filtering precisions by a membrane paver according to the sequence of the precisions from coarse to fine to form a composite layered microporous filtering membrane;
step two: dividing the composite layered microporous filtering membrane into an upstream supporting filtering membrane and a downstream supporting filtering membrane according to the sequence of the upstream-to-downstream precisions from low to high;
step three: the upstream filtering support membrane, the multi-layer microporous filter membrane and the downstream filtering support membrane are paved in sequence to form a composite layered microporous filter membrane;
step four: cutting the redundant part of the composite multi-layer microporous filter membrane according to the height of the filter cartridge, and synchronously performing hot melting kneading and edge locking on two sides of the tiled composite multi-layer microporous filter membrane to prevent side leakage;
step five: folding the flatly laid composite multi-layer microporous filter membrane by a folding machine according to the diameter of the filter cartridge of the filter, cutting the folded composite multi-layer microporous filter membrane according to the diameter of the filter cartridge, and then performing hot melting and kneading on the head seam and the tail seam;
step six: and (3) loading the composite multilayer microporous filter membrane subjected to overlock hot melting and folding into a pp filter cylinder, and carrying out hot melting welding on end covers of pp materials in the same batch with the filter cylinder body of the filter cylinder to form the filter element of the filter.
Preferably, in the fourth step, the cutting width of the excess part of the composite multi-layer microporous filter membrane is determined according to the height of the filter cylinder body.
Preferably, the hot melt kneading in the fourth step and the fifth step is carried out, and the kneading temperature is 150-170 ℃; kneading time period: 3-5 seconds.
Preferably, in step five, the total length of the pleated membrane is matched to the filter cartridge in order to ensure that the filter cartridge is sufficiently filled to ensure adequate filtration area.
Preferably, the end cover is thermally welded in the step six: welding temperature: 350-360 ℃, welding time: for 10 seconds.
Preferably, the filter element of the filter in the sixth step is naturally cooled for 3-6 hours in a dust-free environment after being welded.
Preferably, the filter element cooled to the normal temperature is subjected to pressure resistance detection in a dust-free environment, and the qualified filter element is subjected to vacuum packaging by using vacuum packaging equipment.
Preferably, the vacuum packed filter cartridge is packaged in a package with a packing cushion and is stored at an optimal temperature of 10 ℃ to 25 ℃.
Preferably, the packaging and hot melting processes in the whole production process are finished in a clean workshop, and operators need to wear isolation clothes, mask and gloves without fiber shedding in the whole process.
Compared with the prior art, the invention has the beneficial effects that: according to the production process of the cascade layered efficient composite membrane folding filter element, the multilayer filtering membranes with different filtering precisions are tiled by the membrane paving equipment, so that a plurality of interception sections with different filtering precisions are formed, intercepted objects can be dispersed according to the precisions and the sizes to be intercepted, and the intercepted objects are dispersed on the plurality of interception sections, so that the dust holding capacity (interception capacity) of a single interception section can be reduced, the blocking condition of an interception surface is reduced, and the filter can be ensured to continuously keep a good passing rate.
The adoption of the tiling of the multiple layers of filtering membranes ensures the dispersive interception, and the coarse filtering membrane also acts as a protective barrier of a subsequent membrane to a certain extent, so that the reliability and the interception rate of the filter can be ensured.
The multilayer filter membranes are tiled, and the interception objects are distributed on the surfaces of the multilayer membranes according to interception precision, so that the interception load (dust holding capacity) of the rearmost end (the membrane with the highest precision) is effectively reduced, and the service life of the filter can be prolonged to a certain extent.
The manufacturing process is simple, only a plurality of layers of filter membranes with different precisions are laid according to different precision requirements when the filter membranes are folded, and other packaging processes are not changed;
more efficient-compared with the filter manufactured by the existing single-layer membrane process, the product manufactured by the process has the advantages that: the filtering speed is higher, the filtering precision is higher, the filtering reliability is stronger, and the service life is longer;
the product manufactured by the process is more environment-friendly and efficient, and can help users reduce the product replacement amount, thereby reducing the replacement workload of production workers, reducing the material replacement amount and reducing the generation amount of solid wastes.
Drawings
FIG. 1 is a schematic flow diagram of the present invention;
FIG. 2 is a schematic view of the overall structure of the filter of the present invention;
FIG. 3 is a schematic view of the overall structure of the filter of the present invention;
FIG. 4 is a schematic view of the structure of the composite multi-layer microporous filter membrane according to the present invention;
FIG. 5 is a schematic view of the structure of a multi-layer microfiltration membrane according to the invention;
in the figure: 1. a barrel body; 2. an end cap; 3. a stem; 4. a socket; 5. compounding a multi-layer microporous filter membrane; 51. an upstream support filter membrane; 52. a downstream support filter membrane; 53. a multi-layer microporous filter membrane.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, the present invention provides a technical solution: a production process of a cascade layering efficient composite membrane folding filter element comprises the following steps:
the method comprises the following steps: the method comprises the following steps of (1) flatly paving a plurality of layers of filtering membranes with different filtering precisions by a membrane paver according to the sequence of the precisions from coarse to fine to form a composite layered microporous filtering membrane;
step two: dividing the composite layered microporous filtering membrane into an upstream supporting filtering membrane and a downstream supporting filtering membrane according to the sequence of the upstream-to-downstream precisions from low to high;
step three: the upstream supporting filter membrane, the multilayer microporous filter membrane and the downstream supporting filter membrane are paved in sequence to form a composite multilayer microporous filter membrane;
step four: cutting the redundant part of the composite multi-layer microporous filter membrane according to the height of the filter cartridge (the cutting width is according to the height of the filter cartridge body), and synchronously performing hot melting kneading and overlocking on two sides of the tiled composite multi-layer microporous filter membrane to prevent side leakage (the overlocking kneading temperature is 150-170 ℃ and the kneading time is 3-5 seconds);
step five: folding the flatly laid composite multi-layer microporous filter membrane by a folding machine according to the diameter of a filter cartridge (the total length of the folded membrane needs to be matched with the filter cartridge, and the filter cartridge is fully filled to ensure enough filtering area), and cutting the folded composite multi-layer microporous filter membrane according to the diameter of the filter cartridge, and then carrying out hot-melt kneading on the head and the tail of the filter cartridge (the kneading temperature is 150-170 ℃, and the kneading time is 3-5 seconds);
step six: and (3) loading the composite multilayer microporous filter membrane subjected to overlock hot melting and folding into a pp filter cylinder, and carrying out hot melting welding on end covers of pp materials in the same batch with the cylinder body of the filter cylinder to form the filter element of the filter (the welding temperature is 350-360 ℃, and the welding time is 10 seconds).
The manufacturing process is simple, only a plurality of layers of filtering membranes with different precisions need to be laid according to different precision requirements when the filtering membranes are folded, and other packaging processes are not changed;
the filter is more efficient, and compared with the filter manufactured by the existing single-layer membrane process, the product manufactured by the process has the advantages that: the filtering speed is higher, the filtering precision is higher, the filtering reliability is stronger, and the service life is longer;
the production process is more environment-friendly and efficient, and the product manufactured by the process can help users reduce the product replacement amount, so that the replacement workload of production workers is reduced, the material replacement amount is also reduced, and the generation amount of solid waste is reduced.
Further, the method comprises the following steps of; naturally cooling the filter element in the sixth step for 3-6 hours in a dust-free environment after welding: carrying out pressure resistance detection on the filter element cooled to the normal temperature state in a dust-free environment, and carrying out vacuum packaging on the qualified filter element by using vacuum packaging equipment; the filter element packed in vacuum is put into a packing box with a packing cushion layer, and the optimal storage temperature is 10-25 ℃.
Generally; the packaging and hot melting processes in the whole production process need to be finished in a clean workshop, and operators need to wear isolation clothes, mask and gloves without fiber shedding in the whole process.
Referring to fig. 2-3, the upstream supporting filter membrane and the downstream supporting filter membrane belong to a multi-layer microporous filter membrane, the entire composite multi-layer microporous filter membrane is composed of microporous filter membranes with different pore sizes and arranged from large to small, and the upstream supporting filter membrane and the downstream supporting filter membrane are only distinguishing names for distinguishing each level inside the entire composite multi-layer microporous filter membrane and do not belong to a substantial filter membrane form.
Referring to fig. 4, the left and right sides of the figure are an upstream support layer and a downstream support layer, the middle is a multi-layer microporous filter membrane, and the folding membrane basically adopts: the upstream supporting layer, the multilayer microporous filter membrane and the downstream supporting layer, wherein the upstream and downstream supporting layers play a role in protecting the filtering core layer, namely the multilayer microporous filter membrane, so that the multilayer microporous filter membrane is protected from being scratched by sharp particles in upstream substances and is protected from deforming and stretching downstream.
The stepped layered high-efficiency composite microporous filter membrane adopts a plurality of microporous filter membranes with different precisions to perform dispersive filtration on a plurality of layers of microporous filter membranes according to the sequence from coarse (the filter aperture is coarse) to fine, thereby achieving the purposes that the filter has good filter flux, safe and reliable interception efficiency and longer service life than the traditional single-layer membrane process.
The utility model provides a step layering high efficiency membrane complex film folding filter core is the tube-shape, and the interior support outside of filter core encircles the compound multilayer millipore filtration membrane after having a week of turn of broken, the upper reaches among this compound multilayer millipore filtration membrane supports the filtration membrane and is located the outside, the low reaches supports the filtration membrane and is located the inboard, be multilayer millipore filtration membrane between two support filtration membranes, thereby form the different interception sections of a plurality of filter fineness, can intercept the interception thing according to precision thickness (size) dispersion, and with interception thing dispersion at a plurality of interception sections, thereby can reduce the dust holding capacity (interception volume) of single interception section, reduce interception face jam situation, guarantee that the filter keeps good percent of pass continuously. The adoption of the tiling of the multiple layers of filtering membranes ensures the dispersive interception, and the coarse filtering membrane also acts as a protective barrier of a subsequent membrane to a certain extent, so that the reliability and the interception rate of the filter can be ensured. The multilayer filter membranes are tiled, and the interception objects are distributed on the surfaces of the multilayer membranes according to interception precision, so that the interception load (dust holding capacity) of the rearmost end (the membrane with the highest precision) is effectively reduced, and the service life of the filter can be prolonged to a certain extent. The barrel body of cartridge filter is overlapped to the outside cover at compound multilayer millipore filtration membrane to the outermost filters and protects the filter core and compound multilayer millipore filtration membrane structure inside.
When the filter is used, a socket of the filter is inserted into the equipment, then the equipment is started to absorb liquid all the time for filtering, when external liquid is firstly subjected to first simple interception and filtration by the cylinder of the filter and then enters the inside, the external liquid is subjected to simple filtration by the upstream supporting filter membrane outside the internal composite multilayer microporous filter membrane, the filter hole on the upstream supporting filter membrane is smaller than the cylinder filter hole of the filter cylinder, the liquid is further filtered, the second filtration of the liquid is realized, then the filtered liquid is filtered by the multilayer microporous filter membrane in the composite multilayer microporous filter membrane, the pore diameter of the multilayer microporous filter membrane is larger than that of the downstream supporting filter membrane and is smaller than that of the upstream supporting filter membrane, so that the liquid is subjected to third filtration, and when the filtration is finished, the liquid is finally filtered by the downstream supporting filter membrane to form fourth filtration, the filter element enters the filter element after the filtration is finished, and finally, the filter element is led into the equipment through the insertion opening, so that the whole liquid filtration process is finished.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (12)
1. A production process of a cascade multilayer efficient composite membrane folding filter element is characterized by comprising the following steps of: the method comprises the following steps:
the method comprises the following steps: the method comprises the following steps of (1) flatly paving a plurality of layers of filtering membranes with different filtering precisions by a membrane paver according to the sequence of the precisions from coarse to fine to form a composite layered microporous filtering membrane;
step two: dividing the composite layered microporous filtering membrane into an upstream supporting filtering membrane and a downstream supporting filtering membrane according to the sequence of the upstream-to-downstream precisions from low to high;
step three: the upstream supporting filter membrane, the multilayer microporous filter membrane and the downstream supporting filter membrane are paved in sequence to form a composite multilayer microporous filter membrane;
step four: cutting the redundant part of the composite multi-layer microporous filter membrane according to the height of the filter cartridge, and synchronously performing hot melting kneading and edge locking on two sides of the tiled composite multi-layer microporous filter membrane to prevent side leakage;
step five: folding the flatly laid composite multi-layer microporous filter membrane by a folding machine according to the diameter of the filter cartridge of the filter, cutting the folded composite multi-layer microporous filter membrane according to the diameter of the filter cartridge, and then performing hot melting and kneading on the head seam and the tail seam;
step six: and (3) loading the composite multilayer microporous filter membrane subjected to overlock hot melting and folding into a pp filter cylinder, and carrying out hot melting welding on end covers of pp materials in the same batch with the filter cylinder body of the filter cylinder to form the filter element of the filter.
2. The process of claim 1, wherein the step multilayer high efficiency composite membrane pleated filter cartridge comprises: in the first step, a plurality of layers of filtering membranes with different filtering precisions are tiled by a membrane paver according to the sequence of the precisions from coarse to fine to form the composite layered microporous filtering membrane.
3. The process for producing a stepped multilayer high efficiency membrane composite pleated filter cartridge of claim 1 wherein: and step two, dividing the composite layered microporous filtering membrane into an upstream supporting filtering membrane (coarse filtration) and a downstream supporting filtering membrane (fine filtration) according to the sequence of the upstream-to-downstream precisions from low to high.
4. The fourth step of claim 1, cutting the excess part of the composite multi-layer microporous filter membrane according to the height of the filter cartridge, and synchronously performing hot-melt kneading and edge locking on two sides of the tiled composite multi-layer microporous filter membrane to prevent side leakage; the kneading temperature is 150-170 ℃, and the kneading time is as follows: 3-5 seconds.
5. In the fifth step of claim 1, the flattened composite multi-layer microporous filter membrane is folded by a folding machine according to the diameter of the filter cartridge of the filter, and the folded composite multi-layer microporous filter membrane is cut according to the diameter of the filter cartridge and then is subjected to hot-melt kneading for head and tail butt seams; the kneading temperature is 150-170 ℃, and the kneading time is as follows: 3-5 seconds.
6. The process of claim 1, wherein the step-wise layering high efficiency composite membrane pleated filter cartridge comprises: in step five, the total length of the pleated membrane is matched to the filter cartridge in order to ensure that the filter cartridge is sufficiently filled to ensure adequate filtration area.
7. The process of claim 1, wherein the step-wise layering high efficiency composite membrane pleated filter cartridge comprises: and step six, end cover hot melting welding: welding temperature: 350-360 ℃, welding time: for 10 seconds.
8. The process of claim 1, wherein the step-wise layering high efficiency composite membrane pleated filter cartridge comprises: and naturally cooling the filter element of the filter in the sixth step for 3-6 hours in a dust-free environment after welding.
9. The process of claim 6, wherein the step-wise layering high efficiency composite membrane pleated filter cartridge comprises: and carrying out pressure-resistant detection on the filter element cooled to the normal temperature state in a dust-free environment, and carrying out vacuum packaging on the qualified filter element by using vacuum packaging equipment.
10. The process of claim 7, wherein the step-wise layering high efficiency composite membrane pleated filter cartridge comprises: the filter element packed in vacuum is put into a packing box with a packing cushion layer, and the optimal storage temperature is 10-25 ℃.
11. The process of claim 1, wherein the step-wise layering high efficiency composite membrane pleated filter cartridge comprises: the packaging and hot melting processes in the whole production process need to be finished in a clean workshop, and operators need to wear isolation clothes, mask and gloves without fiber shedding in the whole process.
12. The process of claim 1, wherein the step-wise layering high efficiency composite membrane pleated filter cartridge comprises: the filter element needs to be handled lightly, cannot be thrown or is severely impacted.
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| CN202110895014.4A CN113509843A (en) | 2021-08-05 | 2021-08-05 | Production process of cascade multilayer efficient composite membrane folding filter element |
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| CN202110895014.4A CN113509843A (en) | 2021-08-05 | 2021-08-05 | Production process of cascade multilayer efficient composite membrane folding filter element |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114515512A (en) * | 2022-03-26 | 2022-05-20 | 付建梅 | Hydrophilic polyvinylidene fluoride nanofiltration membrane and preparation method thereof |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1148941A (en) * | 1965-04-13 | 1969-04-16 | Prec Mecanique Labinal | Improvement in or relating to filters |
| CN101306270A (en) * | 2008-07-06 | 2008-11-19 | 蔺爱国 | Production method of foldable filter element with high filtration flux |
| CN101411952A (en) * | 2008-08-26 | 2009-04-22 | 张金松 | Folding type water purifying filter element |
| CN101590337A (en) * | 2008-05-29 | 2009-12-02 | 上海过滤器有限公司 | A kind of combined polypropylene thermal spray fiber membrane folding type filter element |
| CN102188848A (en) * | 2010-03-11 | 2011-09-21 | 浙江瑞普环境技术有限公司 | High-flux high-dirt-holding-capacity filtering element and preparation method thereof |
| CN107029474A (en) * | 2017-06-04 | 2017-08-11 | 上海谷奇核孔膜材料科技有限公司 | Foldable filter element structure, cartridge apparatus and its processing method |
| CN208066145U (en) * | 2017-12-29 | 2018-11-09 | 湖州航天精细化工有限责任公司 | A kind of collapsible filter core |
| CN112295312A (en) * | 2019-07-25 | 2021-02-02 | 江苏正迈过滤技术有限公司 | Production method of medical filter element |
-
2021
- 2021-08-05 CN CN202110895014.4A patent/CN113509843A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1148941A (en) * | 1965-04-13 | 1969-04-16 | Prec Mecanique Labinal | Improvement in or relating to filters |
| CN101590337A (en) * | 2008-05-29 | 2009-12-02 | 上海过滤器有限公司 | A kind of combined polypropylene thermal spray fiber membrane folding type filter element |
| CN101306270A (en) * | 2008-07-06 | 2008-11-19 | 蔺爱国 | Production method of foldable filter element with high filtration flux |
| CN101411952A (en) * | 2008-08-26 | 2009-04-22 | 张金松 | Folding type water purifying filter element |
| CN102188848A (en) * | 2010-03-11 | 2011-09-21 | 浙江瑞普环境技术有限公司 | High-flux high-dirt-holding-capacity filtering element and preparation method thereof |
| CN107029474A (en) * | 2017-06-04 | 2017-08-11 | 上海谷奇核孔膜材料科技有限公司 | Foldable filter element structure, cartridge apparatus and its processing method |
| CN208066145U (en) * | 2017-12-29 | 2018-11-09 | 湖州航天精细化工有限责任公司 | A kind of collapsible filter core |
| CN112295312A (en) * | 2019-07-25 | 2021-02-02 | 江苏正迈过滤技术有限公司 | Production method of medical filter element |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114515512A (en) * | 2022-03-26 | 2022-05-20 | 付建梅 | Hydrophilic polyvinylidene fluoride nanofiltration membrane and preparation method thereof |
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