CN102114391A - Method for preparing polyisophthaloyl metaphenylene diamide nanofiltration membrane - Google Patents
Method for preparing polyisophthaloyl metaphenylene diamide nanofiltration membrane Download PDFInfo
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- CN102114391A CN102114391A CN2009102441690A CN200910244169A CN102114391A CN 102114391 A CN102114391 A CN 102114391A CN 2009102441690 A CN2009102441690 A CN 2009102441690A CN 200910244169 A CN200910244169 A CN 200910244169A CN 102114391 A CN102114391 A CN 102114391A
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Abstract
The invention discloses a method for preparing an asymmetric nanofiltration membrane by using polyisophthaloyl metaphenylene diamide as a raw material and adopting a phase inversion method. The method is characterized in that a homogeneous casting solution containing polyisophthaloyl metaphenylene diamide, an organic solvent and additives is filtered and defoamed, and is scraped into a nascent membrane with a certain thickness on a clean and smooth glass plate or non-woven fabric by a salivation method at a certain temperature and humidity; and the nascent membrane is immersed in a gel bath to cure and form after the solvent is distilled for a certain period. An aromatic polyamide nanofiltration membrane prepared by the technology provided by the invention has excellent characteristics of high temperature resistance, consolidation resistance, pollution resistance, parabolic stability, selective permeability and the like; and the method has the advantages of simple film forming process, convenience in operation, low operation cost and easiness for realization of industrialization. The method is applicable to the fields of industrial wastewater and high-temperature fluid special treatment, water desalinization and softening treatment and the like.
Description
Technical field
The invention belongs to the separation membrane field, particularly a kind of is main membrane material with poly, adopts phase inversion to prepare the method for asymmetric dull and stereotyped NF membrane.
Background technology
NF membrane is a kind of new membrane isolation technics between reverse osmosis membrane and milipore filter, it has higher removal efficiency to divalence, multivalent ion and relative molecular mass at organic matter more than 200 and big anionic group, and cost of investment and operation, maintenance cost are relatively low.Since NF membrane is come out, be subjected to people's attention and attention with its significant stalling characteristic, range of application is widened rapidly, be widely used in the removing and concentrate of water softening, small organic molecule, the organic classification of different molecular weight and concentrate, field such as waste water decoloring.
At present, both at home and abroad in succession the commercialization NF membrane major part of exploitation be by interfacial polymerization be prepared from (US5152901, CN101352659).Interfacial polymerization is that micropore basal membrane is immersed in the aqueous solution of hydrophilic monomer, gets rid of excessive monomer solution, and then immerses and carry out the liquid liquld interfacial polycondensation reaction in the organic solution of certain hydrophobic monomer, thereby forms a superthin layer on porous supporting body.In order to obtain better film properties, generally also need again through last handling processes such as chargedization of hydrolysis or ionizing radiation or heat treatments.Though this preparation method can need separately to be optimized respectively at active layer and supporting layer, makes film have higher separating property and permeation flux, its complicated process of preparation, influence factor is more, and the production cycle is longer, and production cost is higher.
The present invention is material of preparing with the poly for addressing the above problem propose a kind of just, adopts phase inversion to prepare the method for NF membrane.This method film-forming process is simple, and the production cycle is shorter, and is easy to operate, and operating cost is low.Simultaneously, because this material price of poly is cheap, and there are phenyl ring and amide group in its macromolecular main chain, not only can improve the water flux of film, aspects such as pressure tightness, stain resistance, heat-resisting quantity, radiation resistance and chemical stability to film also have greatly improved simultaneously, are with a wide range of applications.
Summary of the invention
The purpose of this invention is to provide a kind of is material of preparing with the poly, adopts phase inversion to prepare the method for asymmetric NF membrane.Utilize this method can prepare easily than (0.3-0.7MPa) under the low operating pressure to the rejection of anionic dye greater than 96%, be more than the 50-85% to the salt rejection rate of divalence and high price inorganic ion, water flux is 33-71L/m
2A series of NF membrane of h.
Adopt the NF membrane of the method preparation to have superior performance, and this method film-forming process is simple, easy to operate, operating cost is low, is easy to realize suitability for industrialized production at aspects such as water penetration, pressure tightness, resistance tocrocking, materialization stability and selection see through.
Description of drawings
The appearance structure of NF membrane is seen Fig. 1 electromicroscopic photograph.Fine and close, smooth, the homogeneous in NF membrane surface (a), antifouling property is good.NF membrane section structure (b) is made up of double-layer structure, the thin and fine and close epidermal area and the supporting layer of porous.From top to bottom, the micropore in the porous layer diminishes gradually, has typical unsymmetric structure.
The specific embodiment
The present invention is achieved by the following technical solutions:
(1) preparation of casting solution: the poly of drying is dissolved in the organic solvent, and the adding certain quantity of additive, to stir and the constant temperature dissolving, formation presents bright amber homogeneous casting solution, after the standing and defoaming, promptly get required casting solution.Said poly is the macromolecular compound with following structure.
The mass concentration of poly is 10～30wt% in the said casting solution, and preferred concentration is 15～25wt%.
The mass concentration of additive is 5～40wt% in the said casting solution, and additive is the key factor of aperture, water flux and the rejection of the made film of decision, mainly includes organic additive and inorganic additive.Wherein organic additive is mainly one or more in EGME, acetone, polyvinylpyrrolidone, dipropylene glycol, polyethylene glycol or the triethylene glycol; Inorganic additive is mainly one or more in calcium chloride, lithium chloride, lithium bromide, aluminum nitrate or the lithium perchlorate.For obtaining high performance film, additive preferred concentration in casting solution is 15～25wt%.
Said organic solvent can adopt N, dinethylformamide, N, one or more in N-dimethylacetylamide, N-N-methyl-2-2-pyrrolidone N-(NMP) or the dimethyl sulfoxide (DMSO);
(2) forming film with phase transformation method
In the knifing chamber, above-mentioned casting solution is cast on the clean glass plate or nonwoven, with the nascent state film of scraper striking certain thickness (150-300 μ m).Treat solvent and additive 100～150 ℃ of down evaporations after 1-10 minute, immerse temperature equably and be curing molding in 10～30 ℃ the coagulation bath, treat to obtain the thick asymmetric membrane of 150-300 μ m behind the gel certain hour (0.5-24 hour).Film taken out after put into after fully cleaning and preserve liquid, promptly get the said NF membrane of the present invention.
Said coagulation bath is the deionized water or the aqueous solution that contains a certain amount of additive, and additive is one or more in dimethylacetylamide, ethanol, glacial acetic acid, the sodium chloride, and mass concentration is 0.5%-5%.
The temperature of knifing chamber is 20～30 ℃, and relative humidity is 40～60%.
Adopt the prepared NF membrane of said method, (anionic dye to the 500-1000 molecular weight under 0.3～0.7MPa) has than high separating efficiency at lower operating pressure, and be 50-85% to the salt rejection rate of the metabisulfite solution of 500ppm, water flux is 33-71L/ (m
2H).This film has the advantage that contamination resistance is strong, separative efficiency is high, water flux is big; Also have good high temperature resistant, acid and alkali-resistance, anti-solvent and mechanical performance simultaneously, can be used for aspects such as the specially treated of industrial wastewater, high temperature fluid and water demineralizing be softening.
The present invention is further illustrated below in conjunction with embodiment.
Embodiment
Embodiment 1
5 grams lithium chlorides and 15 gram polyvinylpyrrolidones are dissolved in the dimethylacetamide solution (DMAC), in about 60 ℃, add the polies of 15 grams then, with this mixture after 80 ℃ of constant temperature stirring and dissolving, airtight standing and defoaming.
The temperature that keeps the knifing chamber is at 25 ℃, relative humidity is 50%, to dissolve fully, homogeneous phase casting solution after the deaeration is cast on the clean glass plate or nonwoven, the film that is about 200 μ m with scraper striking thickness, 120 ℃ of evaporations are after 10 minutes, glass plate or nonwoven are immersed equably to contain mass concentration be film-forming in 5% the ethanol water, and the coagulation bath temperature is 10 ℃.Treat gel after 30 minutes, the filter membrane taking-up is fully cleaned to be placed on deionized water preserve in the liquid, promptly get the said NF membrane of the present invention.
Under the pressure of 0.5MPa, made film is to the Na of 500mg/L
2SO
4The rejection of solution is 63.7%, and water flux is 67.8L/m
2H.
Embodiment 2
As described in example 1 above, the casting solution mass concentration is 15% constant, and solvent adopts N-methyl pyrrolidone (NMP), organic additive adopts EGME, mass concentration is 15%, and the coagulation bath water temperature is 15 ℃, and coagulation bath is that to contain mass concentration be 2% ethanol water.Under the pressure of 0.5MPa, made film is to the Na of 500mg/L
2SO
4The rejection of solution is 72.5%, and water flux is 52.3L/m
2H.
Embodiment 3
As described in example 1 above, solvent adopts dimethylacetylamide (DMAC), change casting solution mass concentration 20%, organic additive adopts 20 gram acetone and dipropylene glycol to be mixed with organic additive by what 2: 1 (quality) was made into, form mixed system, 120 ℃ evaporated 5 minutes, and coagulation bath is a deionized water, and water temperature is 20 ℃.Made film is to the Na of 500mg/L
2SO
4The rejection of solution is 80.5%, and water flux is 48.6L/m
2H.
Embodiment 4
As described in example 1 above, casting solution concentration is 20% constant, and solvent adopts N-methyl pyrrolidone (NMP), and organic additive kind and concentration are constant, and inorganic additive is the additive package that 8 grams lithium chlorides and calcium chloride are made into by 3: 1 (quality).Coagulation bath is to contain 5% sodium-chloride water solution, and the coagulation bath temperature is 25 ℃.Under 0.7MPa pressure, made film is to 500ppmNa
2SO
4Salt rejection rate be 78.2%, water flux is 56.8L/m
2H.
Embodiment 5
As described in example 1 above, get 25 gram polies, join in the mixed solvent that 60 gram dimethylacetylamides and N-methyl pyrrolidones are made into by 3: 1 (quality), add 15 gram acetone and glycol dimethyl ethers again and be mixed with organic additive by what 2: 1 (quality) was made into, form mixed system, 140 ℃ evaporated 2 minutes, and coagulation bath is a deionized water, 25 ℃ of water temperatures.Under 0.7MPa pressure, made film is to 500ppmNa
2SO
4Salt rejection rate be 85.7%, water flux is 34.9L/m
2H.
Claims (5)
1. the preparation method of a poly NF membrane, it is characterized in that: adopt the inversion of phases film build method, the homogeneous phase casting solution that will contain poly, non-proton property polar solvent and additive after filtration with deaeration after, under certain temperature and humidity, scrape on level and smooth glass plate of cleaning or nonwoven with the hydrostomia method and to make the nascent state film that thickness is 150～300 μ m, this film is after the solvent evaporation of certain hour, immerse curing molding in the coagulation bath, promptly get the poly NF membrane.Made film (under 0.3～0.7MPa), has the small organic molecule of molecular weight between 200～1000 and well to hold back effect, and divalence and high valence ion are had the ability that better removes at lower pressure.
2. the preparation method of a kind of poly NF membrane according to claim 1 is characterized in that: made NF membrane is asymmetrical flat board or rolling NF membrane.
3. the preparation method of a kind of poly NF membrane according to claim 1 is characterized in that: contain the poly of 15～25wt%, the additive of 5～25wt% and the non-proton property polar solvent of surplus in the casting solution.
4. non-proton property polar solvent according to claim 1 is characterized in that: can be selected from N, dinethylformamide, N, one or more in N-dimethylacetylamide, N-N-methyl-2-2-pyrrolidone N-(NMP) or the dimethyl sulfoxide (DMSO);
5. additive according to claim 1 is characterized in that: include organic additive and inorganic additive.Wherein organic additive is one or more in EGME, acetone, glacial acetic acid, dipropylene glycol, polyethylene glycol or the triethylene glycol; Inorganic additive is one or more in calcium chloride, lithium chloride, lithium bromide, aluminum nitrate or the lithium perchlorate.
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102451622A (en) * | 2010-10-27 | 2012-05-16 | 中国科学院城市环境研究所 | Preparation method of nanofiltration membrane for dye concentration and desalination |
| CN103055726A (en) * | 2013-01-25 | 2013-04-24 | 丽水学院 | Preparation method of low-pressure high-flux nanofiltration membrane |
| CN103537198A (en) * | 2013-09-27 | 2014-01-29 | 中国科学院广州化学研究所 | Kevlar nano fiber porous membrane, and preparation method and application thereof |
| CN105384954A (en) * | 2015-12-16 | 2016-03-09 | 国网电力科学研究院武汉南瑞有限责任公司 | Method using aramid fiber resin for preparation of aramid fiber insulation film |
| CN106110908A (en) * | 2016-07-05 | 2016-11-16 | 浙江赛特膜技术有限公司 | The preparation method of aromatic polyamides hydridization NF membrane |
| CN108939950A (en) * | 2018-07-23 | 2018-12-07 | 大连理工大学 | A kind of preparation method of aromatic polyamide film |
| CN108939952A (en) * | 2018-09-28 | 2018-12-07 | 蔡菁菁 | A kind of water-oil separating PMIA super-hydrophobic nano tunica fibrosa and preparation method |
| CN109012236A (en) * | 2018-08-07 | 2018-12-18 | 中国乐凯集团有限公司 | Casting solution, ultrafiltration membrane and the method for preparing ultrafiltration membrane |
| CN109464922A (en) * | 2018-11-14 | 2019-03-15 | 轻工业环境保护研究所 | A kind of compound forward osmosis membrane of high chlorine resistance and preparation method thereof |
| CN109966928A (en) * | 2019-03-18 | 2019-07-05 | 浙江泰林生命科学有限公司 | A kind of preparation method of high-throughput high-intensitive polyamide flat micro-filtration |
| CN111359458A (en) * | 2020-04-03 | 2020-07-03 | 江西省科学院能源研究所 | Molybdenum disulfide oxide modified flat nanofiltration membrane as well as preparation method and application thereof |
| CN112569809A (en) * | 2020-11-20 | 2021-03-30 | 上海应用技术大学 | PMIA modified ultrafiltration membrane with photocatalytic performance and preparation and application thereof |
| CN112755816A (en) * | 2021-02-22 | 2021-05-07 | 上海应用技术大学 | High-heat-resistance polyisophthaloyl metaphenylene diamine nanofiltration membrane as well as preparation method and application thereof |
| CN113811377A (en) * | 2019-04-05 | 2021-12-17 | 奥斯龙-明士克公司 | Smoke filter medium |
| CN114053890A (en) * | 2021-12-09 | 2022-02-18 | 天津工业大学 | High-performance alkali-resistant nanofiltration membrane and preparation method thereof |
| WO2023040435A1 (en) * | 2021-09-15 | 2023-03-23 | 北京理工大学 | Modified polyisophthaloyl metaphenylene diamine ultrafiltration membrane, and preparation method therefor and application thereof |
-
2009
- 2009-12-30 CN CN2009102441690A patent/CN102114391A/en active Pending
Cited By (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102451622A (en) * | 2010-10-27 | 2012-05-16 | 中国科学院城市环境研究所 | Preparation method of nanofiltration membrane for dye concentration and desalination |
| CN103055726A (en) * | 2013-01-25 | 2013-04-24 | 丽水学院 | Preparation method of low-pressure high-flux nanofiltration membrane |
| CN103537198A (en) * | 2013-09-27 | 2014-01-29 | 中国科学院广州化学研究所 | Kevlar nano fiber porous membrane, and preparation method and application thereof |
| CN103537198B (en) * | 2013-09-27 | 2016-06-29 | 中国科学院广州化学研究所 | A kind of Kevlar nano fiber porous film and preparation method thereof and application |
| CN105384954A (en) * | 2015-12-16 | 2016-03-09 | 国网电力科学研究院武汉南瑞有限责任公司 | Method using aramid fiber resin for preparation of aramid fiber insulation film |
| CN106110908A (en) * | 2016-07-05 | 2016-11-16 | 浙江赛特膜技术有限公司 | The preparation method of aromatic polyamides hydridization NF membrane |
| CN108939950B (en) * | 2018-07-23 | 2021-05-04 | 大连理工大学 | Preparation method of aromatic polyamide film |
| CN108939950A (en) * | 2018-07-23 | 2018-12-07 | 大连理工大学 | A kind of preparation method of aromatic polyamide film |
| CN109012236A (en) * | 2018-08-07 | 2018-12-18 | 中国乐凯集团有限公司 | Casting solution, ultrafiltration membrane and the method for preparing ultrafiltration membrane |
| CN109012236B (en) * | 2018-08-07 | 2021-08-10 | 中国乐凯集团有限公司 | Casting membrane liquid, ultrafiltration membrane and method for preparing ultrafiltration membrane |
| CN108939952A (en) * | 2018-09-28 | 2018-12-07 | 蔡菁菁 | A kind of water-oil separating PMIA super-hydrophobic nano tunica fibrosa and preparation method |
| CN109464922B (en) * | 2018-11-14 | 2021-06-22 | 轻工业环境保护研究所 | High-chlorine-resistance composite forward osmosis membrane and preparation method thereof |
| CN109464922A (en) * | 2018-11-14 | 2019-03-15 | 轻工业环境保护研究所 | A kind of compound forward osmosis membrane of high chlorine resistance and preparation method thereof |
| CN109966928A (en) * | 2019-03-18 | 2019-07-05 | 浙江泰林生命科学有限公司 | A kind of preparation method of high-throughput high-intensitive polyamide flat micro-filtration |
| CN109966928B (en) * | 2019-03-18 | 2024-02-23 | 浙江泰林生命科学有限公司 | Preparation method of high-flux high-strength polyamide flat plate micro-filtration membrane |
| CN113811377A (en) * | 2019-04-05 | 2021-12-17 | 奥斯龙-明士克公司 | Smoke filter medium |
| CN111359458A (en) * | 2020-04-03 | 2020-07-03 | 江西省科学院能源研究所 | Molybdenum disulfide oxide modified flat nanofiltration membrane as well as preparation method and application thereof |
| CN112569809A (en) * | 2020-11-20 | 2021-03-30 | 上海应用技术大学 | PMIA modified ultrafiltration membrane with photocatalytic performance and preparation and application thereof |
| CN112755816A (en) * | 2021-02-22 | 2021-05-07 | 上海应用技术大学 | High-heat-resistance polyisophthaloyl metaphenylene diamine nanofiltration membrane as well as preparation method and application thereof |
| WO2023040435A1 (en) * | 2021-09-15 | 2023-03-23 | 北京理工大学 | Modified polyisophthaloyl metaphenylene diamine ultrafiltration membrane, and preparation method therefor and application thereof |
| CN114053890A (en) * | 2021-12-09 | 2022-02-18 | 天津工业大学 | High-performance alkali-resistant nanofiltration membrane and preparation method thereof |
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Application publication date: 20110706 |