CN102258915A - Single side composite filter membrane, and preparation method thereof - Google Patents
Single side composite filter membrane, and preparation method thereof Download PDFInfo
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- CN102258915A CN102258915A CN201110123816XA CN201110123816A CN102258915A CN 102258915 A CN102258915 A CN 102258915A CN 201110123816X A CN201110123816X A CN 201110123816XA CN 201110123816 A CN201110123816 A CN 201110123816A CN 102258915 A CN102258915 A CN 102258915A
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- casting solution
- filter membrane
- membrane
- film
- framework material
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- 239000012528 membrane Substances 0.000 title claims abstract description 42
- 239000002131 composite material Substances 0.000 title claims abstract description 17
- 238000002360 preparation method Methods 0.000 title claims description 19
- 239000000463 material Substances 0.000 claims abstract description 49
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 claims abstract description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000000654 additive Substances 0.000 claims abstract description 17
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims abstract description 16
- 230000000996 additive effect Effects 0.000 claims abstract description 16
- 239000002904 solvent Substances 0.000 claims abstract description 16
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims abstract description 12
- 238000000034 method Methods 0.000 claims abstract description 12
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 claims abstract description 10
- 238000007761 roller coating Methods 0.000 claims abstract description 10
- 239000002202 Polyethylene glycol Substances 0.000 claims abstract description 7
- 229920001223 polyethylene glycol Polymers 0.000 claims abstract description 7
- SCYULBFZEHDVBN-UHFFFAOYSA-N 1,1-Dichloroethane Chemical compound CC(Cl)Cl SCYULBFZEHDVBN-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229920002301 cellulose acetate Polymers 0.000 claims abstract description 4
- 229920001577 copolymer Polymers 0.000 claims abstract description 4
- 229920002492 poly(sulfone) Polymers 0.000 claims abstract description 4
- 229920002239 polyacrylonitrile Polymers 0.000 claims abstract description 4
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims abstract description 4
- 238000005266 casting Methods 0.000 claims description 53
- 238000010438 heat treatment Methods 0.000 claims description 14
- 229920002521 macromolecule Polymers 0.000 claims description 12
- -1 polypropylene Polymers 0.000 claims description 12
- 229920004933 Terylene® Polymers 0.000 claims description 11
- 150000001875 compounds Chemical class 0.000 claims description 11
- 239000005020 polyethylene terephthalate Substances 0.000 claims description 11
- 239000004744 fabric Substances 0.000 claims description 10
- 239000003292 glue Substances 0.000 claims description 7
- 238000005470 impregnation Methods 0.000 claims description 7
- 229920000784 Nomex Polymers 0.000 claims description 6
- 239000000835 fiber Substances 0.000 claims description 6
- KWGKDLIKAYFUFQ-UHFFFAOYSA-M lithium chloride Chemical compound [Li+].[Cl-] KWGKDLIKAYFUFQ-UHFFFAOYSA-M 0.000 claims description 6
- IIPYXGDZVMZOAP-UHFFFAOYSA-N lithium nitrate Chemical compound [Li+].[O-][N+]([O-])=O IIPYXGDZVMZOAP-UHFFFAOYSA-N 0.000 claims description 6
- 239000004763 nomex Substances 0.000 claims description 6
- 239000004743 Polypropylene Substances 0.000 claims description 5
- 239000011248 coating agent Substances 0.000 claims description 5
- 238000000576 coating method Methods 0.000 claims description 5
- 239000004745 nonwoven fabric Substances 0.000 claims description 5
- 229920001155 polypropylene Polymers 0.000 claims description 5
- 239000002033 PVDF binder Substances 0.000 claims description 3
- 229920000036 polyvinylpyrrolidone Polymers 0.000 claims description 3
- WHNWPMSKXPGLAX-UHFFFAOYSA-N N-Vinyl-2-pyrrolidone Chemical compound C=CN1CCCC1=O WHNWPMSKXPGLAX-UHFFFAOYSA-N 0.000 claims description 2
- INHCSSUBVCNVSK-UHFFFAOYSA-L lithium sulfate Inorganic materials [Li+].[Li+].[O-]S([O-])(=O)=O INHCSSUBVCNVSK-UHFFFAOYSA-L 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- RBTVSNLYYIMMKS-UHFFFAOYSA-N tert-butyl 3-aminoazetidine-1-carboxylate;hydrochloride Chemical compound Cl.CC(C)(C)OC(=O)N1CC(N)C1 RBTVSNLYYIMMKS-UHFFFAOYSA-N 0.000 claims description 2
- 238000001467 acupuncture Methods 0.000 claims 2
- WFKAJVHLWXSISD-UHFFFAOYSA-N isobutyramide Chemical compound CC(C)C(N)=O WFKAJVHLWXSISD-UHFFFAOYSA-N 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 10
- 238000001914 filtration Methods 0.000 abstract description 9
- 239000001038 titanium pigment Substances 0.000 abstract description 2
- 239000007788 liquid Substances 0.000 abstract 3
- 239000003795 chemical substances by application Substances 0.000 abstract 2
- 230000008961 swelling Effects 0.000 abstract 2
- FXHOOIRPVKKKFG-UHFFFAOYSA-N N,N-Dimethylacetamide Chemical compound CN(C)C(C)=O FXHOOIRPVKKKFG-UHFFFAOYSA-N 0.000 abstract 1
- 229940113088 dimethylacetamide Drugs 0.000 abstract 1
- 230000002035 prolonged effect Effects 0.000 abstract 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 8
- 238000001879 gelation Methods 0.000 description 5
- 238000012163 sequencing technique Methods 0.000 description 5
- 239000000047 product Substances 0.000 description 4
- 235000010215 titanium dioxide Nutrition 0.000 description 4
- 239000004408 titanium dioxide Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 2
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000012065 filter cake Substances 0.000 description 1
- LFIWDPYJFLBDMX-UHFFFAOYSA-N lithium;sulfuric acid Chemical compound [Li].OS(O)(=O)=O LFIWDPYJFLBDMX-UHFFFAOYSA-N 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000011265 semifinished product Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- Manufacture Of Macromolecular Shaped Articles (AREA)
Abstract
The invention relates to a single side composite filter membrane. The invention relates to the technical field of the production of filter membrane used for filtering. The filter membrane is produced from a framework material and membrane forming liquid. With a roller coating method, the membrane forming liquid is coated on the framework material, such that the filter membrane is produced. The membrane forming liquid comprises a macromolecular membrane forming material, a solvent, a swelling agent, and an additive. The macromolecular membrane forming material is one of polyacrylonitrile, vinyl chloride-acrylonitrile copolymer, polysulfone, cellulose acetate, or polyvinylidene difluoride. The solvent is one of dimethyl formamide, acetone, dichloroethane, and dimethyl acetamide. The swelling agent is one of dimethyl sulfoxide, polyethylene glycol, acetone, water, and methanol. The single side composite filter membrane provided by the invention has relatively small filtering apertures, a smooth surface, and a stable filtering speed. The filter membrane satisfies a fine filtration requirement of titanium pigment industries. When the filter membrane is used in production lines, almost no leakage is occurred, and material spilling is even less. The service life of the membrane is greatly prolonged, resource utilization rate of manufacturer users is improved, and benefit is increased.
Description
Technical field
The present invention relates to be used in the titanium white production filter membrane manufacturing technology field of filtering, the compound filter membrane of particularly a kind of single face, the present invention also comprises the preparation method of this filter membrane.
Background technology
Filter cloth is an indispensable material at production process of titanium pigment, and the semi-finished product of titanium dioxide, finished product and products thereof all need just can produce by its filtration on the relevant operation.Because the producer of domestic production filter cloth is more at present, it is uneven qualitatively production management and product, very wither and help mutually, add dog-eat-dog each other, so some producer is for reducing the cost of product, on price, get the mastery, so that often selecting aspect the raw-material material grade some on the low side; On the production technology of present domestic anatase thpe white powder, the filter cloth that most of producers use is conventional varieties such as 758#, 240#, 260#, the client reflects that generally these filter clothes race material are more, the leakage phenomenon often has generation, and general service life is about one and a half months.
Summary of the invention
Technical problem to be solved by this invention is to overcome the filter cloth that is used to filter in titanium dioxide to run the shortcoming that material is more, the leakage phenomenon often has generation and lack service life, provides a kind of single face compound filter membrane.
Another object of the present invention provides the preparation method of the compound filter membrane of a kind of this single face.
Technical problem of the present invention solves by following technical proposals:
The compound filter membrane of a kind of single face, comprise framework material and casting solution, application " roller coating method " applies casting solution and is prepared from framework material, it is characterized in that: described framework material is a Spunbond, and described casting solution is made up of following composition and percentage by weight:
Macromolecule filming material: account for the 14%-19% of casting solution, a kind of in polyacrylonitrile, vinyl chloride-acrylonitrile copolymer, polysulfones, cellulose acetate, the polyvinylidene fluoride;
Solvent: account for the 64%-69% of casting solution, a kind of in dimethyl formamide, acetone, dichloroethanes, the dimethyl sulfoxide (DMSO);
Sweller: account for the 15%-18% of casting solution, a kind of in dimethyl sulfoxide (DMSO), polyethylene glycol, acetone, water, the methyl alcohol;
Additive: the 1%-1.5% that accounts for casting solution;
Described Spunbond is a kind of in terylene Nomex, polypropylene fibre eedle-punched non-wovens or the terylene spun laced fabric.
Described additive is a kind of in PVP, lithium chloride, lithium nitrate, polyethylene glycol, the lithium sulfate.
The preparation method of the compound filter membrane of described single face, undertaken by following step:
1) preparation of framework material
Nonwoven is finalized the design and press polish through the forming machine secondary;
2) preparation of casting solution: macromolecular material, solvent, sweller, additive are added behind the impregnation jar in proper order airtight in the described ratio of claim 1, be stirred to fully in heating under 55 ± 5 ℃ of temperature and leave standstill after the dissolving, deaeration is stand-by;
3) lead out, the speed of framework material 0.5-1.0m/min is launched;
4) film forming, when nonwoven moved to upper glue roller and scraper place, " roller coating method " technology of employing made nonwoven surface form the uniform coating of thickness, and its environment temperature is 25 ℃ ± 3, and ambient humidity is 25%-45%, and the casting solution temperature remains on 55 ± 5 ℃;
5) gel: the film that step 4) is made immersed rapidly in 3 ℃-5 ℃ the cold water 10-20 minute, and film is separated, and made composite membrane;
6) heat treatment: the composite membrane that step 5) makes was placed 15-20 minute in 65 ℃-85 ℃ hot water, made wet film;
7) oven dry: the wet film that step 6) is made is put into 80 ℃-90 ℃ temperature 10-15 minute and is made dry film.
The present invention utilizes coating to filter good particle interception capacity, play a part filtering surface, and nonwoven plays the face of doing that supports, on coating procedure, except the surface formation coating of base cloth, the fiber of nonwoven inside is also applied to a certain extent, helps to reduce the influence of heat and chemical action, and increased abrasive forces and improved the filter cake fissility, reduced the particle penetration medium possibility, improved and unloaded cake ability and rapid equilibrium pressure drop.The compound filter membrane of single face of the present invention has less pore size filter, also has smooth surface, the rate of filtration is stable, can satisfy the production requirement of titanium dioxide industry fine filtering, this filter membrane is used for almost there is not the leakage phenomenon on the production line, runs material still less, and prolong service life significantly, improve the resource utilization of user producer, increased benefit.
The specific embodiment
Below in conjunction with embodiment the present invention is described in further detail:
Embodiment 1
1) preparation of framework material
The terylene Nomex is made framework material through typing of forming machine secondary and press polish;
2) the preparation casting solution is 500 kilograms
Form casting solution with macromolecule filming material, solvent, sweller, additive, with account for casting solution 70 kilograms of macromolecule filming material polyacrylonitrile, account for casting solution 345 kilograms of solvent dimethyl formamides, account for casting solution 80 kilograms of sweller dimethyl sulfoxide (DMSO)s, account for 5 kilograms of additive PVPs of casting solution, sequencing is airtight after adding in the impregnation jar, leave standstill after heating under 50 ℃ of temperature is stirred to fully dissolving, deaeration is stand-by;
3) lead out
Framework material terylene Nomex nonwoven 0.8m/min is launched;
4) film forming
When nonwoven moved to upper glue roller and scraper place, " roller coating method " technology of employing made nonwoven surface form the uniform film of thickness, and wherein the film forming environment temperature is 25 ℃, and ambient humidity is 25%, and the casting solution temperature is 50 ℃;
5) gelation
With above-mentioned steps 4) in prepared film immersed rapidly in 3 ℃ the cold water 10 minutes, make composite membrane;
6) heat treatment
With above-mentioned steps 5) in the composite membrane that makes put into 65 ℃ hot water and placed 20 minutes, make wet film;
7) oven dry
With above-mentioned steps 6) wet film that makes puts into 80 ℃ of drying rooms and places and made dry film in 10 minutes.
Embodiment 2
1) preparation of framework material
The polypropylene fibre eedle-punched non-wovens is made framework material through typing of forming machine secondary and press polish;
2) the preparation casting solution is 500 kilograms
Form casting solution with macromolecule filming material, solvent, sweller, additive, with account for casting solution 70 kilograms macromolecule filming material vinyl chloride-acrylonitrile copolymer, account for casting solution 335 kilograms solvent acetone, account for casting solution 90 kilograms of sweller polyethylene glycol, account for 5 kilograms additive lithium chloride of casting solution, sequencing is airtight after adding in the impregnation jar, leave standstill after heating under 60 ℃ of temperature is stirred to fully dissolving, deaeration is stand-by;
3) lead out
Framework material terylene Nomex nonwoven 0.5m/min is launched;
4) film forming
When nonwoven moved to upper glue roller and scraper place, " roller coating method " technology of employing made nonwoven surface form the uniform film of thickness, and wherein the film forming environment temperature is 22 ℃, and ambient humidity is 30%, and the casting solution temperature is 60 ℃;
5) gelation
With above-mentioned steps 4) in prepared film immersed rapidly in 5 ℃ the cold water 20 minutes, make composite membrane;
6) heat treatment
With above-mentioned steps 5) in the composite membrane that makes put into 85 ℃ hot water and placed 15 minutes, make wet film;
7) oven dry
With above-mentioned steps 6) wet film that makes puts into 90 ℃ temperature and places and made dry film in 15 minutes.
Embodiment 3
1) preparation of framework material
The terylene spun laced fabric is made framework material through typing of forming machine secondary and press polish;
2) preparation of casting solution is 500 kilograms
Form casting solution with macromolecule filming material, solvent, sweller, additive, with account for casting solution 95 kilograms macromolecule filming material polysulfones, account for casting solution 320 kilograms solvent dichloroethanes, account for casting solution 80 kilograms sweller acetone, account for 5 kilograms additive lithium nitrate of casting solution, sequencing is airtight after adding in the impregnation jar, leave standstill after heating under 55 ℃ of temperature is stirred to fully dissolving, deaeration is stand-by;
3) lead out
Framework material terylene spun laced fabric is pressed 1.0m/min to launch;
4) film forming
When nonwoven moved to upper glue roller and scraper place, " roller coating method " technology of employing made nonwoven surface form the uniform film of thickness, and wherein the film forming environment temperature is 28 ℃, and ambient humidity is 45%, and the casting solution temperature is 55 ℃;
5) gelation
With above-mentioned steps 4) in prepared film immersed rapidly in 4 ℃ the cold water 15 minutes, film is separated, make composite membrane;
6) heat treatment
With above-mentioned steps 5) in the composite membrane that makes put into 75 ℃ hot water and placed 20 minutes, make wet film;
7) oven dry
With above-mentioned steps 6) wet film that makes puts into 85 ℃ temperature and places and made dry film in 10 minutes.
Embodiment 4
1) preparation of framework material
The terylene spun laced fabric is made framework material through typing of forming machine secondary and press polish;
2) preparation of casting solution is 500 kilograms
Form casting solution with macromolecule filming material, solvent, sweller, additive, with account for casting solution 95 kilograms macromolecule filming material cellulose acetate, account for casting solution 320 kilograms solvent dimethyl sulfoxide (DMSO), account for casting solution 77.5 kilograms sweller water, account for 7.5 kilograms additives polyethylene glycol of casting solution, sequencing is airtight after adding in the impregnation jar, leave standstill after heating under 50 ℃ of temperature is stirred to fully dissolving, deaeration is stand-by;
3) lead out
Framework material terylene Nomex is pressed 0.5m/min to launch;
4) film forming
When nonwoven moved to upper glue roller and scraper place, " roller coating method " technology of employing made nonwoven surface form the uniform film of thickness, and wherein the film forming environment temperature is 25 ℃, and ambient humidity is 25%, and the casting solution temperature is 55 ℃;
5) gelation
With above-mentioned steps 4) in prepared film immersed rapidly in 3 ℃ the cold water 10 minutes, film is separated, make composite membrane;
6) heat treatment
With above-mentioned steps 5) in the composite membrane that makes put into 65 ℃ hot water and placed 20 minutes, make wet film;
7) oven dry
With above-mentioned steps 6) wet film that makes puts into 85 ℃ temperature and places and made dry film in 15 minutes.
Embodiment 5
1) preparation of framework material
The polypropylene fibre eedle-punched non-wovens is made framework material through typing of forming machine secondary and press polish;
2) preparation of casting solution is 500 kilograms
Form casting solution with macromolecule filming material, solvent, sweller, additive, with account for casting solution 90 kilograms macromolecule filming material polyvinylidene fluoride, account for casting solution 320 kilograms solvent dimethyl sulfoxide (DMSO), account for casting solution 84 kilograms sweller methyl alcohol, account for 6 kilograms additive sulfuric acid lithium of casting solution, sequencing is airtight after adding in the impregnation jar, leave standstill after heating under 60 ℃ of temperature is stirred to fully dissolving, deaeration is stand-by;
3) lead out
Framework material polypropylene fibre eedle-punched non-wovens is pressed 1.0m/min to launch;
4) film forming
When nonwoven moved to upper glue roller and scraper place, " roller coating method " technology of employing made nonwoven surface form the uniform film of thickness, and wherein the film forming environment temperature is 25 ℃, and ambient humidity is 45%, and the casting solution temperature is 60 ℃;
5) gelation
With above-mentioned steps 4) in prepared film immersed rapidly in 5 ℃ the cold water 20 minutes, film is separated, make composite membrane;
6) heat treatment
With above-mentioned steps 5) in the composite membrane that makes put into 85 ℃ hot water and placed 15 minutes, make wet film;
7) oven dry
With above-mentioned steps 6) wet film that makes puts into 90 ℃ temperature and places and made dry film in 15 minutes.
Claims (4)
1. compound filter membrane of single face, comprise framework material and casting solution, application " roller coating method " applies casting solution and is prepared from framework material, it is characterized in that: described framework material is the acupuncture spun-bonded non-woven, and described casting solution is made up of following composition and percentage by weight:
Macromolecule filming material: account for the 14%-19% of casting solution, a kind of in polyacrylonitrile, vinyl chloride-acrylonitrile copolymer, polysulfones, cellulose acetate, the polyvinylidene fluoride;
Solvent: account for the 64-69% of casting solution, a kind of in dimethyl formamide, acetone, dichloroethanes, the dimethylacetylamide;
Sweller: account for the 15%-18% of casting solution, a kind of in dimethyl sulfoxide (DMSO), polyethylene glycol, acetone, water, the methyl alcohol;
Additive: the 1%-1.5% that accounts for casting solution.
2. the compound filter membrane of single face according to claim 1 is characterized in that described acupuncture spun-bonded non-woven is a kind of in terylene Nomex, polypropylene fibre eedle-punched non-wovens or the terylene spun laced fabric.
3. the compound filter membrane of single face according to claim 1 is characterized in that described additive is a kind of in PVP, lithium chloride, lithium nitrate, polyethylene glycol, the lithium sulfate.
4. one kind prepares the method for the compound filter membrane of single face according to claim 1, is undertaken by following step:
1) preparation of framework material
Nonwoven is finalized the design and press polish through the forming machine secondary;
2) preparation of casting solution: it is airtight that macromolecular material, solvent, sweller, additive are added in the impregnation jar back in proper order in the described ratio of claim 1, is stirred to fully in heating under 55 ± 5 ℃ of temperature and leaves standstill after the dissolving, and deaeration is stand-by;
3) lead out, framework material is pressed the speed of 0.5-1.0m/min and launched;
4) film forming, when nonwoven moved to upper glue roller and scraper place, " roller coating method " technology of employing made nonwoven surface form the uniform coating of thickness, and its environment temperature is 25 ℃ ± 3, and ambient humidity is 25%-45%, and the casting solution temperature remains on 55 ± 5 ℃;
5) gel: the film that step 4) is made immersed rapidly in 3 ℃-5 ℃ the cold water 10-20 minute, and film is separated, and made composite membrane;
6) heat treatment: the composite membrane that step 5) makes was placed 15-20 minute in 65 ℃-85 ℃ hot water, made wet film;
7) oven dry: the wet film that step 6) is made is put into 80 ℃-90 ℃ temperature 10-15 minute and is made dry film.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110123816XA CN102258915A (en) | 2011-05-13 | 2011-05-13 | Single side composite filter membrane, and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110123816XA CN102258915A (en) | 2011-05-13 | 2011-05-13 | Single side composite filter membrane, and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102258915A true CN102258915A (en) | 2011-11-30 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110123816XA Pending CN102258915A (en) | 2011-05-13 | 2011-05-13 | Single side composite filter membrane, and preparation method thereof |
Country Status (1)
| Country | Link |
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| CN (1) | CN102258915A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109569327A (en) * | 2018-12-21 | 2019-04-05 | 中国科学技术大学 | A kind of polyacrylonitrile nanofiber perforated membrane and preparation method thereof |
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| US6110309A (en) * | 1996-01-22 | 2000-08-29 | Usf Filtration And Separations Group, Inc. | Process of making a polyvinylidene difluoride membrane |
| CN1288776A (en) * | 2000-09-21 | 2001-03-28 | 华东理工大学 | Preparation of sulfonated polyether sulfone filtering film |
| CN1380131A (en) * | 2002-01-25 | 2002-11-20 | 中国科学院化学研究所 | Preparation method of dry type polyacrylointrile ultrafiltration membrane |
| CN1548585A (en) * | 2003-05-10 | 2004-11-24 | 甘肃省膜科学技术研究院 | Composite diaphragm for electrolyzing Co and its prepn |
| CN101239280A (en) * | 2007-11-27 | 2008-08-13 | 北京市射线应用研究中心 | Reinforced microporous filter membrane and method and device for preparing the same |
-
2011
- 2011-05-13 CN CN201110123816XA patent/CN102258915A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6110309A (en) * | 1996-01-22 | 2000-08-29 | Usf Filtration And Separations Group, Inc. | Process of making a polyvinylidene difluoride membrane |
| CN1288776A (en) * | 2000-09-21 | 2001-03-28 | 华东理工大学 | Preparation of sulfonated polyether sulfone filtering film |
| CN1380131A (en) * | 2002-01-25 | 2002-11-20 | 中国科学院化学研究所 | Preparation method of dry type polyacrylointrile ultrafiltration membrane |
| CN1548585A (en) * | 2003-05-10 | 2004-11-24 | 甘肃省膜科学技术研究院 | Composite diaphragm for electrolyzing Co and its prepn |
| CN101239280A (en) * | 2007-11-27 | 2008-08-13 | 北京市射线应用研究中心 | Reinforced microporous filter membrane and method and device for preparing the same |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109569327A (en) * | 2018-12-21 | 2019-04-05 | 中国科学技术大学 | A kind of polyacrylonitrile nanofiber perforated membrane and preparation method thereof |
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Application publication date: 20111130 |