CN104258743A - High-performance composite nanofiltration membrane with resistance to oxidation of organic solvent and chlorine, as well as preparation method and application of membrane - Google Patents
High-performance composite nanofiltration membrane with resistance to oxidation of organic solvent and chlorine, as well as preparation method and application of membrane Download PDFInfo
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Abstract
The invention relates to a high-performance composite nanofiltration membrane with resistance to oxidation of an organic solvent and chlorine, as well as a preparation method and application of the membrane. According to the preparation method, an interfacial polymerization process is interfered by supporting electrolyte, so that the density of aqueous phase monomers adsorbed on the surface of the membrane is increased, a base membrane is closely connected with an active layer, and the active layer is compact while the thickness of the active layer is reduced; therefore, high permeation flux can be obtained while low-concentration monomers are used, and high selectivity is maintained. The composite nanofiltration membrane has the properties of resisting to oxidation of the organic solvent and chlorine, under the pressure of 1.0 MPa and at the temperature of 25 DEG C, the flux of 2g/L sodium sulfate aqueous solution is 25-65 L/(m<2>.h), and retention rate is 85-99%; the flux of 2g/L sodium chloride aqueous solution is 30-60 L/(m<2>.h), and the retention rate is 50-75%.
Description
Technical field
The invention belongs to the preparing technical field of diffusion barrier, particularly the high-performance composite nanometer filtering film of a kind of organic solvent-resistant and resistance to oxychloride, its preparation method and application.
Background technology
Nanofiltration (nanofiltration, NF) of the present invention is a kind of pressure-driven membrane process between ultrafiltration and counter-infiltration, because its membrane aperture is gained the name at about 1nm.NF membrane molecular cut off, generally between 200 ~ 1000 dalton, has higher rejection to divalence and multivalent ion, low to monovalent ion rejection, is particularly suitable for the ion etc. of organic matter that isolated molecule amount is hundreds of and divalence, multivalence.Current Nanofiltration-membrane technique has been widely applied to multiple fields such as food, chemical industry, medicine, environmental protection, metallurgy, ocean.
Interfacial polymerization is current the most frequently used, the method for the most effectively preparing NF membrane in the world, is also the method that commodity NF film kind is maximum, output is maximum.The surface-active layer thickness of NF membrane prepared by interfacial polymerization generally can reach about 50nm or thinner, has flux advantage.Interfacial polymerization is the monomer that utilizes two kinds of reactivities very high at two immiscible solvent interface place polymerization reaction take places, thus on porous supporting body, form the very thin fine and close composite bed of one deck.It is some difunctionals or trifunctional activated monomer that interfacial polymerization produces macromolecule composite nanometer filtering film monomer used, the monomer that wherein can be soluble in the aqueous phase has diamines (as m-phenylene diamine (MPD), piperazine etc.), polyvinyl alcohol and bis-phenol etc., and the monomer that can be dissolved in oil phase has diacid chloride, three acyl chlorides etc.First by wherein a kind of activated monomer is soluble in water before preparation, form aqueous phase system; Another kind of activated monomer is dissolved in oil phase, forms oil phase monomer.Basement membrane is first dipped in one of them system a period of time, taking-up is dried, then is dipped in a period of time in another one system, sometimes through Overheating Treatment, allows two kinds of monomers react, thus forms superthin layer in basement membrane interface and obtain NF membrane.
The principal element affecting interface polymerization reaction has the kind and concentration etc. of monomer concentration in the kind of monomer, two phase liquid, the temperature of interfacial polymerization, interface polymerization reaction time, additive.In order to obtain the better film of performance, generally also need to carry out post processing to obtained film.The key of the method is choosing of basement membrane and controls the distribution coefficient of two class reactants in two-phase and diffusion rate well, rationalizes and as far as possible thin to make the porousness on film top layer.Chinese Patent Application No. CN2014100010605 discloses a kind of online method preparing high-flux composite reverse osmosis membrane; the method allows ultrafiltration membranes pass in succession through the m-phenylene diamine (MPD) aqueous solution; the hexane solution of pyromellitic trimethylsilyl chloride; baking oven, rinse bath, oxidation trough; reduction cell; glycerite groove and protection liquid bath, finally dry in an oven, obtain high-flux composite reverse osmosis membrane.Chinese Patent Application No. CN201380002763 relates to a kind of reverse osmosis membrane and preparation method thereof.Described reverse osmosis membrane comprises: porous supporting body; The polysulfones layer that described porous supporting body is formed; With the polyamide active layer formed on described polysulfones layer.Described polyamide active layer is formed by the interfacial polymerization between amines and acetyl halide compound.Described acetyl halide compound comprises simple function carboxylic acid halides and multifunctional carboxylic acid halides.
Usually, most of polyamide composite film is used for water or wastewater treatment, and at present, many researchers begin one's study polyamide composite nanofiltration membrane application in organic solvent.The support layer material of commodity composite nanometer filter film generally adopts polysulfones (PSF) and polyether sulfone (PES), but they are under the extreme harsh environment of the medium medium and high temperature, organic solution etc. of higher or lower pH, and chemical stability is poor.Polyacrylonitrile (PAN) has excellent heat resistance and chemical stability, and has certain solvent resistance, therefore for the supporting layer of solvent resistant NF membrane.Polymine (PEI) is a kind of high molecular weight water soluble polymer, and in recent years, the interfacial polymerization carried out both at home and abroad based on PEI is studied.The research of positively charged nanofiltration membranes is prepared in the interfacial polymerization carried out earlier based on PEI and TMC such as Zhang Haoqin, Liu's Golden Shield, and (novel positively charged nanofiltration membranes is prepared in interfacial polymerization, " chemistry circular ", 2005; The UV absorber of novel positively charged nanofiltration membranes, colleges and universities' Chemical Engineering journal, 2006).Yang Yanhong, Fang Wenji etc. with homemade polyether sulfone (PES) milipore filter for basement membrane, with polymine (PEI) and pyromellitic trimethylsilyl chloride (TMC) for reaction monomers, interfacial polymerization is adopted to prepare composite nanometer filtering film, with optimal conditions, film to the rejection of monovalent salt about 30%, to the rejection of divalent salts close to 70%, more than 90% (Yang Yanhong is reached to the rejection of low molecule organic dyestuff, Fang Wenji. the preparation research of positively charged nanofiltration membranes, Henan chemical industry .2007,24 (5): 10-12).Chinese Patent Application No. CN2012105732454 discloses a kind of preparation method of Positively charged composite nanofiltration membrane, adopts interfacial polymerization to prepare PEI/ chitosan quaternary ammonium salt/TiO
2/ TMC composite nanometer filtering film, this membrane flux is large, high to dyestuff rejection, all lower to the rejection of monovalence and divalent inorganic ion, and the desalination that can be applicable to liquid crude dyestuff is purified.The people such as Li Lingbo, Zhang Haoqin with PAN milipore filter for basement membrane, with pyromellitic trimethylsilyl chloride (TMC) for crosslinking agent, pass through interface polymerization reaction, by hydrophilic polymine (PEI) and hydrophobic hydroxy-end capped poly-methyl-3,3,3 trifluoropropyl siloxanes (PDMS) are cross-linked to form network structure composite bed, make the imine group in PEI and TMC that imidization occurs simultaneously and lose active hydrogen, thus improve its solvent resistance.Obtained film has good solvent resistance to ester, ketone, alcohol, alkanes; Film has good rejection effect to the polymer substance that molecular weight is more than 600 dalton, has larger flux (Zhang H, Zhang Y to alcohol, ester, ketones solvent, Li L, et.al.Chemical Engineering Science, 2014,106:157-166.).
But in prior art, in order to make polyamide nanofiltration membrane obtain higher rejection in most research, the monomer concentration adopted is often higher, and aqueous phase Immersion time and the interface polymerization reaction time relatively long, prepared NF membrane flux is lower.In order to obtain high flux, while lifting operation pressure, also considerably increase energy consumption.
Summary of the invention
The object of the invention is to solve the deficiencies in the prior art, a kind of method adopting low concentration monomer solution to carry out interfacial polymerization within a short period of time to prepare the high-performance composite nanometer filtering film of organic solvent-resistant and resistance to oxychloride is provided, prepared composite nanometer filtering film can obtain high permeating flux, keep high separation selectivity simultaneously, and there is good organic solvent resistance and chlorine-resistant oxidation susceptibility, meet the needs of practical application better.
In order to realize object of the present invention, method core of the present invention adopts high molecular polymer amine to be aqueous phase film forming monomer, and adopt support electrolyte to intervene interfacial polymerization process, improve aqueous phase monomers adsorption density on the surface of the film, make to be connected between basement membrane with active layer more tight, make active layer become finer and close, reduce active layer thickness simultaneously, thus can high permeating flux be obtained when using low concentration monomer, keep high separation selectivity simultaneously.
The present invention take polyacrylonitrile ultrafiltration film as basement membrane, with high molecular polymer amine for aqueous phase filmogen, with polynary acyl chlorides for organic phase filmogen, adopts interfacial polymerization to prepare composite nanometer filtering film, is specially:
A preparation method for the high-performance composite nanometer filtering film of organic solvent-resistant and resistance to oxychloride, comprises the steps,
Step one: the preparation of aqueous phase monomers solution
High molecular polymer amine is dissolved in deionized water, add a certain amount of do not have acid accept function and not with the water-soluble inorganic salt of sour accepting agent generation chemical reaction as supporting electrolyte, be stirred to and dissolve completely, be made into aqueous phase monomers solution;
Preferably, in step one, add one or more in a certain amount of sour accepting agent, surfactant, phase transfer catalyst further;
Step 2: the preparation of organic phase monomer solution
Polynary acyl chlorides is dissolved in organic solvent, is made into organic phase monomer solution;
Step 3: the pretreatment of basement membrane
Plasma treatment or Chemical Pretreatment are carried out to polyacrylonitrile ultrafiltration film, makes the surface charge of basement membrane;
Step 4: interface polymerization reaction
The basement membrane of surface charge is immersed in 5 ~ 30min in aqueous phase monomers solution, makes the amine in the abundant adsorbent solution of basement membrane;
Above-mentioned film being taken out, draining the high molecular polymer amine aqueous solution to getting rid of film excess surface in atmosphere;
Then, above-mentioned film is immersed in 10 ~ 120s in organic phase monomer solution, interface polymerization reaction occurs, form composite bed;
The film defining composite bed is taken out from organic phase monomer solution, after draining in atmosphere, obtains nascent state composite membrane;
By nascent state composite membrane heat treatment 10min ~ 30min at 60 DEG C ~ 80 DEG C, organic solvent unnecessary in removing nascent state composite membrane, promote that unreacted amido and acid chloride groups further cross-linking reaction occur simultaneously, thus improve cutoff performance and the stability of interfacial polymerization film.
Preferably, high molecular polymer amine of the present invention is polymine (PEI).
Preferably, sour accepting agent of the present invention is water miscible carbonate.
Preferably, water-soluble inorganic salt of the present invention is hydrochloride, more preferably sodium chloride or potassium chloride.
Preferably, surfactant of the present invention is anion surfactant or zwitterionic surfactant.
Preferably, polynary acyl chlorides of the present invention is pyromellitic trimethylsilyl chloride (TMC).
Preferably, in aqueous phase monomers solution of the present invention, the mass percent concentration of high molecular polymer amine is 0.1% ~ 1.0%, supporting electrolytical molar concentration is 0.1 ~ 1mol/L, the mass percent concentration of acid accepting agent is 0 ~ 0.2%, and the mass percent concentration of surfactant is 0 ~ 0.01%.
Preferably, in organic phase monomer solution of the present invention, the mass percent concentration of polynary acyl chlorides is 0.01% ~ 0.4%.
Preferably, Chemical Pretreatment of the present invention adopts hydrolyzed modified method, specifically under 60 ~ 70 DEG C of constant temperatures, polyacrylonitrile ultrafiltration film is immersed 0.5 ~ 2h in the NaOH solution of 2mol/L, by hydrophilic modification, makes membrane surface bear electricity.
The present invention protects the high-performance composite nanometer filtering film of a kind of organic solvent-resistant and resistance to oxychloride further, and it is prepared by above-mentioned preparation method.
NF membrane of the present invention, under the condition of 1.0MPa and 25 DEG C, is 25 ~ 65L/ (m to the flux of 2g/L aqueous sodium persulfate solution
2h), rejection is 85 ~ 99%; Be 40 ~ 60L/ (m to the preferred flux of 2g/L aqueous sodium persulfate solution
2h), rejection is 95 ~ 98%.
NF membrane of the present invention, under the condition of 1.0MPa and 25 DEG C, is 30 ~ 60L/ (m to the flux of 2g/L sodium-chloride water solution
2h), rejection is 50 ~ 75%; Be 50 ~ 60L/ (m to the preferred flux of 2g/L sodium-chloride water solution
2h), rejection is 50 ~ 65%.
The high-performance composite nanometer filtering film of a kind of organic solvent-resistant of the present invention and resistance to oxychloride, any one solvent soaking at room temperature in acetone, n-hexane, methyl alcohol 20 days, to Na
2sO
4the fall of rejection be less than 3%, the fall of solution flux is less than 15%.
The high-performance composite nanometer filtering film of a kind of organic solvent-resistant of the present invention and resistance to oxychloride, the NaClO solution at room temperature through 2000ppm soaks 1 hour, to Na
2sO
4the fall of rejection is less than 3.5%.
The present invention protects above-mentioned composite nanometer filtering film further or is prepared the application of composite nanometer filtering film by above-mentioned preparation method; described composite nanometer filtering film is applied to the desalting and purifying in nanofiltration field, and the molecular weight in Separation of Organic system is greater than 500 daltonian solutes.
The test condition of film prepared by the present invention: the Na selecting 2g/L respectively
2sO
4the NaCl aqueous solution of the aqueous solution and 2g/L, the separating property of the prepared NF membrane of test under be 1.0MPa and temperature being the condition of 25 DEG C at operating pressure, salt rejection rate (R) and water flux (J) are calculated as follows respectively:
Wherein C
ffor concentration of raw material, C
pfor permeate concentration, Δ V is permeate volume, and A is effective film area, and t is the testing time.
Compared with prior art, filming performance is good in the present invention, and preparation process is simple, and preparation cost is low, and production environment is friendly.The present invention adopts high molecular polymer amine as the aqueous phase filmogen of synthesis laminated film, compares small molecule amine monomer, and prepared structure of composite membrane is comparatively loose, flux is higher.The present invention finds, supports and can affect the behavior of amine high molecular polymer in membrane surface electrolytical adding, improve environmental microbes further, improve flux and the selective retention performance of film in aqueous phase solution.Support electrolyte and can also guarantee that aqueous phase monomers and oil phase monomer all carry out interfacial polymerization under lower concentration, and film forming speed is fast, easily-controlled operation.The composite nanometer filtering film adopting the present invention to prepare has high, the selective high characteristic of flux, and has certain tolerance performance to organic solvent, has good practicality.
Accompanying drawing explanation
The flow chart of Fig. 1 preparation method of the present invention.
Fig. 2 is the stereoscan photograph of prepared organic solvent-resistant and resistance to oxychloride high-performance composite nanometer filtering film.
Detailed description of the invention
Below in conjunction with accompanying drawing and specific embodiment, method of the present invention is described further.
Comparative example:
Basement membrane is polyacrylonitrile (PAN) film, molecular cut off 50000Da (dalton), flat-plate ultrafiltration membrane, and effective film area is 28.26cm
2; High molecular polymer amine used is polymine (PEI, molecular weight is 60,000 Da); Polynary acyl chlorides used is pyromellitic trimethylsilyl chloride (TMC), and sour accepting agent used is sodium carbonate, surfactant used is lauryl sodium sulfate, and its preparation process is as follows:
Step one: the preparation of aqueous phase monomers solution
Described high molecular polymer amine, sour accepting agent, surfactant are dissolved in deionized water, be stirred to and dissolve completely, the mass percent concentration being made into high molecular polymer amine is 0.4%, the mass percent concentration of acid accepting agent is 0.1%, the mass percent concentration of surfactant is the aqueous solution of 0.003%, is aqueous phase monomers solution;
Step 2: the preparation of organic phase monomer solution
Polynary acyl chlorides is dissolved in n-hexane, is made into the organic phase monomer solution that mass percent is 0.2%;
Step 3: the pretreatment of basement membrane
Adopt hydrolyzed modified technology, under 65 DEG C of constant temperatures, polyacrylonitrile ultrafiltration film is immersed 1h in the NaOH solution of 2mol/L;
Take out basement membrane, fall the NaOH solution on film surface with deionized water rinsing, until rinsing liquid pH is neutral, obtain modification basement membrane;
Step 4: interface polymerization reaction
Charged basement membrane is immersed in 10min in aqueous phase solution, makes the amine in the abundant adsorbent solution of basement membrane;
Taken out by above-mentioned film, the amine aqueous solution drained in atmosphere to film excess surface is got rid of;
Above-mentioned film is immersed in 60s in organic phase monomer solution, interface polymerization reaction occurs, form composite bed;
The basement membrane defining composite bed is taken out from organic phase monomer solution, after draining in atmosphere, obtains nascent state composite membrane;
By nascent state composite membrane heat treatment 15min at 70 DEG C, organic solvent unnecessary in removing nascent state composite membrane, promotes that unreacted amido and acid chloride groups further cross-linking reaction occur simultaneously, thus improves cutoff performance and the stability of interfacial polymerization film;
Membrane separating property is evaluated:
Prepared NF membrane is carried out separating property test under 1.0MPa operating pressure, and test result is: to Na
2sO
4rejection be 24%, solution flux is 448L/ (m
2h).Visible, under lower aqueous phase and oil phase monomer concentration conditions, prepared film is very low to bivalent ions rejection, does not have good ion and selects separating property.
Embodiment 1:
High molecular polymer amine used, polynary acyl chlorides, sour accepting agent, surfactant are identical with comparative example.Sodium chloride is added as support electrolyte during preparation aqueous phase monomers solution.Supporting electrolytical concentration in aqueous phase monomers solution is 0.5mol/L, and the mass percent concentration of surfactant is 0.002%, and other parameter is identical with comparative example with technique, and test condition is identical with comparative example.NF membrane prepared by this embodiment is to Na
2sO
4rejection be 96%, solution flux is 53L/ (m
2h); Be 71% to the rejection of NaCl, solution flux is 55L/ (m
2h).
Embodiment 2:
High molecular polymer amine used, polynary acyl chlorides are identical with comparative example.Do not add sour accepting agent and surfactant.Sodium chloride is added as support electrolyte during preparation aqueous phase monomers solution.Supporting electrolytical concentration in aqueous phase monomers is 0.5mol/L, and modification basement membrane Immersion time in aqueous phase monomers solution is 30min, and other parameter is identical with comparative example with technique, and test condition is identical with comparative example.NF membrane prepared by this embodiment is to Na
2sO
4rejection be 90%, solution flux is 62L/ (m
2h); Be 57% to the rejection of NaCl, solution flux is 63L/ (m
2h).
Embodiment 3:
High molecular polymer amine used, polynary acyl chlorides are identical with comparative example.Do not add sour accepting agent and surfactant.Sodium chloride is added as support electrolyte during preparation aqueous phase monomers solution.In aqueous phase monomers, the mass percent concentration of high molecular polymer amine is 0.8%, to support electrolytical concentration be 0.5mol/L, and other parameter is identical with comparative example with technique, and test condition is identical with comparative example.NF membrane prepared by this embodiment is to Na
2sO
4rejection be 96%, solution flux is 52L/ (m
2h); Be 53% to the rejection of NaCl, solution flux is 59L/ (m
2h).
Embodiment 4:
High molecular polymer amine used, polynary acyl chlorides, surfactant are identical with comparative example.Acid accepting agent adopts potash, adds potassium chloride as support electrolyte during preparation aqueous phase monomers solution.Supporting electrolytical concentration in aqueous phase monomers is 0.5mol/L, and the mass percent concentration of sour accepting agent is 0.1%, and the mass percent concentration of surfactant is 0.002%, and other parameter is identical with comparative example with technique.NF membrane prepared by this embodiment carries out separating property test under 0.6MPa operating pressure, and test result is: to Na
2sO
4rejection be 96%, solution flux is 45L/ (m
2h); Be 45% to the rejection of NaCl, solution flux is 59L/ (m
2h).Under 1.0MPa, to Na
2sO
4rejection be 96%, solution flux reaches 90L/ (m
2h).At room temperature after the NaClO solution of 2000ppm soaks one hour, under 0.6MPa, to Na
2sO
4rejection is 94%, and flux is 46L/ (m
2h).
Embodiment 5:
High molecular polymer amine used, polynary acyl chlorides are identical with comparative example.Do not add sour accepting agent and surfactant.Sodium chloride is added as support electrolyte during preparation aqueous phase monomers solution.Supporting electrolytical concentration in aqueous phase solution is 0.5mol/L, and in organic phase monomer solution, the mass percent of polynary acyl chlorides is 0.15%, and other parameter is identical with comparative example with technique, and test condition is identical with comparative example.NF membrane prepared by this embodiment is to Na
2sO
4rejection be 97%, solution flux is 38L/ (m
2h); Be 63% to the rejection of NaCl, solution flux is 42L/ (m
2h).This film at room temperature through the process of n-hexane solvent soaking after 20 days, to Na
2sO
4rejection be 96%, solution flux is 36L/ (m
2h), be 66% to the rejection of NaCl, solution flux is 40L/ (m
2h).
Embodiment 6:
High molecular polymer amine used, polynary acyl chlorides are identical with comparative example.Do not add sour accepting agent and surfactant.Sodium chloride is added as support electrolyte during preparation aqueous phase monomers solution.Supporting electrolytical concentration in aqueous phase solution is 0.5mol/L, and in organic phase monomer solution, the mass percent of polynary acyl chlorides is 0.3%, and other parameter is identical with comparative example with technique, and test condition is identical with comparative example.NF membrane prepared by this embodiment is to Na
2sO
4rejection be 99%, solution flux is 44L/ (m
2h); Be 61% to the rejection of NaCl, solution flux is 45L/ (m
2h).This film at room temperature through acetone solvent immersion treatment after 20 days, to Na
2sO
4rejection be 97%, solution flux is 37L/ (m
2h); Be 58% to the rejection of NaCl, solution flux is 36L/ (m
2h).In 20 days of whole experiment, although flux and rejection all have decline, fall is very low, and the separating property of film keeps relatively steady, and this composite membrane has application prospect in organic solvent.
Embodiment 7:
High molecular polymer amine used, polynary acyl chlorides, surfactant are identical with comparative example.Acid accepting agent adopts potash, does not add sour accepting agent and surfactant.Add during preparation aqueous phase monomers solution
sodium chlorideas support electrolyte.Supporting electrolytical concentration in aqueous phase monomers is 0.5mol/L, and interfacial polymerization 120s, other parameter is identical with comparative example with technique.NF membrane prepared by this embodiment under 1.0MPa, to Na
2sO
4rejection is 98%, and flux is 38L/ (m
2h); At room temperature soak in the NaClO solution of 2000ppm after 1 hour, to Na
2sO
4rejection is 95%, and flux is 50L/ (m
2h).Chlorine-resistant property is good.
Comparative example and each embodiment more as shown in table 1.Table 1:
As can be seen from Table 1, the present invention adopts and supports electrolyte intervention interfacial polymerization process, improve aqueous phase monomers adsorption density on the surface of the film, make to be connected between basement membrane with active layer tightr, active layer is made to become finer and close, reduce active layer thickness simultaneously, thus can high permeating flux be obtained when using low concentration monomer, keep high separation selectivity simultaneously.
Claims (10)
1. a preparation method for the high-performance composite nanometer filtering film of organic solvent-resistant and resistance to oxychloride, is characterized in that, comprise the steps,
Step one: the preparation of aqueous phase monomers solution
High molecular polymer amine is dissolved in deionized water, add a certain amount of do not have acid accept function and not with the water-soluble inorganic salt of sour accepting agent generation chemical reaction as supporting electrolyte, be stirred to and dissolve completely, be made into aqueous phase monomers solution;
Step 2: the preparation of organic phase monomer solution
Polynary acyl chlorides is dissolved in organic solvent, is made into organic phase monomer solution;
Step 3: the pretreatment of basement membrane
Plasma treatment or Chemical Pretreatment are carried out to polyacrylonitrile ultrafiltration film, makes the surface charge of basement membrane;
Step 4: interface polymerization reaction
The basement membrane of surface charge is immersed in 5 ~ 30min in aqueous phase monomers solution, makes the amine in the abundant adsorbent solution of basement membrane;
Above-mentioned film being taken out, draining the high molecular polymer amine aqueous solution to getting rid of film excess surface in atmosphere;
Then, above-mentioned film is immersed in 10 ~ 120s in organic phase monomer solution, interface polymerization reaction occurs, form composite bed;
The film defining composite bed is taken out from organic phase monomer solution, after draining in atmosphere, obtains nascent state composite membrane;
By nascent state composite membrane heat treatment 10min ~ 30min at 60 DEG C ~ 80 DEG C, obtain the high-performance composite nanometer filtering film of a kind of organic solvent-resistant and resistance to oxychloride.
2. preparation method according to claim 1, is characterized in that, adds one or more in a certain amount of sour accepting agent, surfactant, phase transfer catalyst in step one further.
3. preparation method according to claim 1 and 2, is characterized in that, described high molecular polymer amine is polymine (PEI), and described polynary acyl chlorides is pyromellitic trimethylsilyl chloride (TMC).
4. preparation method according to claim 1 and 2, is characterized in that, described water-soluble inorganic salt is hydrochloride.
5. preparation method according to claim 1 and 2, is characterized in that, described sour accepting agent is water miscible carbonate, and described surfactant is anion surfactant or zwitterionic surfactant.
6. preparation method according to claim 1 and 2, it is characterized in that, in described aqueous phase monomers solution, the mass percent concentration of high molecular polymer amine is 0.1% ~ 1.0%, supporting electrolytical molar concentration is 0.1 ~ 1mol/L, the mass percent concentration of acid accepting agent is 0 ~ 0.2%, and the mass percent concentration of surfactant is 0 ~ 0.01%.
7. preparation method according to claim 1 and 2, is characterized in that, in described organic phase monomer solution, the mass percent concentration of polynary acyl chlorides is 0.01% ~ 0.4%.
8. preparation method according to claim 1 and 2, it is characterized in that, Chemical Pretreatment described in step 3 adopts hydrolyzed modified method, specifically under 60 ~ 70 DEG C of constant temperatures, polyacrylonitrile ultrafiltration film is immersed 0.5 ~ 2h in the NaOH solution of 2mol/L, by hydrophilic modification, make membrane surface bear electricity.
9. the high-performance composite nanometer filtering film of an organic solvent-resistant and resistance to oxychloride, it is characterized in that, prepared by the preparation method of claim 1-8 any one, described composite nanometer filtering film, under the condition of 1.0MPa and 25 DEG C, is 25 ~ 65L/ (m to the flux of 2g/L aqueous sodium persulfate solution
2h), rejection is 85 ~ 99%; Be 30 ~ 60L/ (m to the flux of 2g/L sodium-chloride water solution
2h), rejection is 50 ~ 75%; Soak 20 days in any one solvent at room temperature in acetone, n-hexane, methyl alcohol, to Na
2sO
4the fall of rejection be less than 3%, the fall of solution flux is less than 15%; NaClO solution at room temperature through 2000ppm soaks 1 hour, to Na
2sO
4the fall of rejection is less than 3.5%.
10. a composite nanometer filtering film according to claim 9 or prepared the application of composite nanometer filtering film by the preparation method of claim 1-8 any one, it is characterized in that, described composite nanometer filtering film is applied to the desalting and purifying in nanofiltration field, and the molecular weight in Separation of Organic system is greater than 500 daltonian solutes.
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