CN105617888B - A kind of preparation method of high flux and high retention ratio composite nanometer filtering film - Google Patents
A kind of preparation method of high flux and high retention ratio composite nanometer filtering film Download PDFInfo
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Abstract
The invention discloses a kind of preparation methods of high flux and high retention ratio composite nanometer filtering film, include the following steps：Polyetherimide and organic solvent are mixed, stirring, standing and defoaming obtains casting solution, casting solution is toppled on non-woven fabrics, knifing, volatilization obtain wet film, are impregnated in water, take out, are dipped in ethylenediamine solution and carry out cross-linking reaction, it takes out, water rinses, and suck dry moisture obtains crosslinked porous support membrane；It is fixed among tablet and frame, is placed in isoperibol, water phase aqueous solution is toppled over into frame, solution is discharged after reaction, it is placed in isoperibol, removes the moisture of remained on surface, pyromellitic trimethylsilyl chloride solution is toppled over into frame, solution is discharged after reaction, it is dry, obtain composite nanometer filtering film；Preparation method of the present invention is simple, easily operated, and the stability of the composite nanometer filtering film high flux and high retention ratio of preparation, film is good, can be not only used in aqueous systems with the small substance of molecular cut off, be also applicable to the separation of organic system.
Description
Technical field
The present invention relates to a kind of preparation methods of high flux and high retention ratio composite nanometer filtering film.
Background technology
Membrane separating process has many advantages, such as that low energy consumption, single-stage separative efficiency is high, process is simple, pollution environment is small, is to solve
The energy in the present age, the important new and high technology of resource and environmental problem, and depth will be played to the transformation of the industrial technology of 21st century
Remote influence.Current countries many in the world, particularly developed countries are all included in membrane separation technique the high-new skill first developed
One of art, and its industrialization is realized rapidly.The application achievements of membrane separation technique have been directed to chemical industry, food, medicine, environmental protection are
To fields such as life sciences.
Nanofiltration is a kind of Aspect of some new membrane processes, and molecular cut off is distributed between 200-1000, and pressure difference is in 0.5-
2.0MPa, its main feature is that operating pressure is low, operating cost is low.Main mechanism of mass transfer basic theories model has nonequilibrium thermodynamics
Model, pore Flow Model, solubility-diffusion model and Dao Nan effects.Compared with electrodialysis, ion exchange and traditional thermal evaporation techniques,
Nanofiltration can desalination simultaneously and concentration, in terms of the separation concentration of organic matter and inorganic matter mixed liquor, nanofiltration has other sides
The incomparable advantage of method.
Interfacial polymerization：It is that the current method for preparing Nano filtering composite membrane most effective in the world and industrialized production are received
Filter membrane kind is most, the maximum method of yield.Interfacial polymerization is taken in the aqueous phase solution for the performed polymer that basement membrane is immersed to polymer
Go out and exclude excessive solution and surface is dried or dried up, then immerses in dilute organic phase solution of crosslinking agent and carried out in short-term again
Between interface-cross-linked reaction, take out and be heating and curing after reaction, form fine and close ultra-thin separation (activity) layer on the surface of basement membrane.It should
The key of method is the distribution coefficient and diffusion velocity of the selection and preparation and control reactant of basement membrane in two-phase.This preparation side
The advantages of method is, by changing the monomer concentration in two kinds of solution, can to regulate and control the performance of selective membrane layer well, so that film
The porousness on surface layer rationalizes.
Currently, industrial widely applied commodity NF membrane is mainly polyamide (PA) composite membrane.When the composite nanometer filtering film
It is obtained by interfacial polymerization, usually using porous polysulfone ultrafiltration membrane as basement membrane (supporting layer), passes through m-phenylene diamine (MPD) ()
The hexane solution of aqueous solution and pyromellitic trimethylsilyl chloride (TMC) reacts to prepare ultra-thin composite layer (active layer or separating layer).So
And there are two main defects for PA composite membranes：(1) since MPDA and TMC reaction rates are quite fast, formed polymer architecture is more
To be highly cross-linked network-like, obtained active layer is thicker, causes that the hydrophily of film surface is insufficient and water flux is smaller；(2) by
In obtained PA film surfaces with negative point lotus, cause film relatively low to the rejection of divalent and high price salt.
Compared with anisotropic membrane, composite membrane shows superior performance in water treatment procedure.Therefore, composite membrane is ground
Study carefully always nearest hot spot, and studies to focus mostly on and be optimized in the separating layer to composite membrane.In this process, newest conjunction
At monomer become research hot spot so that film can have special performance.[Li, the L. such as LiLei；Zhang,S.；Zhang,
X.；Zheng,G.,Journal of Membrane Science2007,289(1-2),258-267；Li,L.；Zhang,S.；
Zhang,X.；Zheng,G.,Journal of Membrane Science2008,315(1-2),20-27；Li,L.；Zhang,
S.；Zhang, X., Journal of Membrane Science2009,335 (1-2), 133-139.] synthesized it is a series of
Aromatic polyvalent acyl chlorides containing biphenyl structural, and utilize aromatic polyvalent acyl chlorides and aromatic polyamine containing biphenyl structural
Carry out interfacial polycondensation in polysulfone supporting layer and prepare the aromatic polyamides composite membrane of novel biphenyl contenting structure, to water flux and
Salt rejection rate can obtain good effect, further widened the range of choice of polyamide reverse osmosis composite film, can be applied to
Sea water desalination, bitter desalination, the fields such as ultra-pure water preparation.When the NaCl solution that separation system is 2000ppm, operating pressure is
When 2MPa, 3,3 ' 5,5 '-biphenyl, four acyl chlorides (mm-BTEC) compound membrane flux can reach 31.7l/m2H, NaCl rejection is
98.4%；2,2 ' 4,4 '-biphenyl, four acyl chlorides (om-BTEC) compound membrane flux can reach 50.0l/m2H, rejection are
97.8%；2,2 ' 5,5 '-biphenyl, four acyl chlorides (op-BTEC) compound membrane flux can reach 54.2l/m2H, NaCl rejection can
To reach 97.2%.Although obtained composite membrane rejection is higher, flux is still less than normal, and operating pressure is larger, and synthesis is single
The process of body is more complicated, and industry should be not high for being worth.Chen Guang[Chen,G.；Li,S.；Zhang,X.；Zhang,S.,
Journal of Membrane Science2008,310 (1-2), 102-109.] etc. by the arylene ether of water-soluble sulfonation
Sulfone (SPES-NH2) be doped into m-phenylene diamine (MPD) aqueous solution, whereby effect is mutually supported to break permeability and selectivity.Optimal
Under preparation condition, by SPES-NH2Obtained compound membrane flux increases significantly (51.2l/m2H), rejection reduces seldom
(NaCl solution of 97.5%, 2000ppm, operating pressure 2MPa), and it is not added with SPES-NH2Compound membrane flux be
37.4l/m2H, rejection 99%.The very little it can be seen that flux remains unchanged receives certain limitation in practical application.Cause
This, preparation method is simple there is an urgent need to researching and developing, the high high flux and high retention ratio composite nanometer filtering film of industrial application value.
Invention content
The purpose of the present invention is overcome the deficiencies of the prior art and provide a kind of high flux and high retention that industrial application value is high
Rate composite nanometer filtering film.
Second object of the present invention is to provide a kind of preparation of the simple high flux and high retention ratio composite nanometer filtering film of method
Method.
Technical scheme of the present invention is summarized as follows：
A kind of preparation method of high flux and high retention ratio composite nanometer filtering film, includes the following steps：
(1) preparation of crosslinked porous support membrane：By polyetherimide in advance through 60-100 DEG C of dry 8-12h and organic
Solvent mixes, and it is 12%-22% to make the mass concentration of polyetherimide, and 6-12h is stirred at 60-90 DEG C, stands 6-14h deaerations,
Casting solution is obtained, casting solution is toppled on non-woven fabrics, knifing, it is 100-300 μm to make the thickness of film, by volatilizing for 0-60s
To wet film, wet film is transferred in 25-50 DEG C of water, impregnates 5-120min, takes out, obtains polyetherimide supporting layer basement membrane, is soaked
Cross-linking reaction 0.5-5h is carried out in the ethylenediamine solution of a concentration of 30-120g/L, taking-up is rinsed with deionized water, and blots table
The moisture in face obtains crosslinked porous support membrane；
(2) preparation of composite nanometer filtering film：It is prepared with a kind of following four kinds of the of method：
Method one：Crosslinked porous support membrane is fixed among tablet and frame, is placed in 25-60 DEG C of isoperibol
30-120s topples over the water phase aqueous solution that mass concentration is 1%-4% into frame, solution is discharged after reacting 10-120s, weight
It is newly placed in 25-60 DEG C of isoperibol, removes the moisture of remained on surface, the equal benzene of a concentration of 0.2-5g/L is toppled over into frame
Solution is discharged after reacting 30-120s, in 50-120 DEG C of dry 3-30min, obtains composite nanometer filtering film by front three solution of acid chloride；
Method two：Crosslinked porous support membrane is fixed among tablet and frame, is placed in 25-60 DEG C of isoperibol
30-120s in the pyromellitic trimethylsilyl chloride solution for toppling over a concentration of 0.2-5g/L into frame, arranges solution after reacting 30-120s
Go out, be replaced in 25-60 DEG C of isoperibol, remove the moisture of remained on surface, it is 1%- that mass concentration is toppled over into frame
Solution is discharged after reacting 10-120s, in 50-120 DEG C of dry 3-30min, obtains composite nanometer filtering film by 4% water phase aqueous solution.
Method three：Crosslinked porous support membrane is wrapped on the idler wheel of film preparation equipment, is placed in 25-60 DEG C of constant temperature ring
30-120s in border is driven the water phase water for making crosslinked porous support membrane rotation by mass concentration for 1%-4% by idler wheel rotation
Solution screws out from the water phase aqueous solution, be replaced in 25-60 DEG C of isoperibol, removes surface after reacting 10-120s
Remaining moisture is rotated by idler wheel and drives pyromellitic trimethylsilyl chloride solution of the film rotation by a concentration of 0.2-5g/L, reacts 30-
120s caudacorias screw out to come from pyromellitic trimethylsilyl chloride solution, in 50-120 DEG C of dry 3-30min, obtain composite nanometer filtering film；
Method four：Crosslinked porous support membrane is wrapped on the idler wheel of film preparation equipment, is placed in 25-60 DEG C of constant temperature ring
30-120s in border is driven the equal benzene for making crosslinked porous support membrane rotation by mass concentration for 0.2-5g/L by idler wheel rotation
Front three solution of acid chloride screws out from the pyromellitic trimethylsilyl chloride solution, is replaced in 25-60 DEG C of perseverance after reacting 10-120s
In warm environment, the moisture of remained on surface is removed, is rotated by idler wheel and drives film rotation water-soluble by the water phase of a concentration of 1%-4%
Liquid, reaction 30-120s caudacorias screw out to come from water phase aqueous solution, in 50-120 DEG C of dry 3-30min, obtain composite nanometer filtering film；
The preferred 18%-20% of mass concentration of polyetherimide in step (1).
Organic solvent be preferably n,N-Dimethylformamide, n,N-dimethylacetamide and N-Methyl pyrrolidone at least
It is a kind of.
The material of non-woven fabrics is preferably polypropylene, polysulfones or polyester.
The solvent of ethylenediamine solution is preferably water, methanol or isopropanol.
The mass concentration of step (2) water phase aqueous solution is preferably 2%.
Water phase is preferably at least one of thiosemicarbazide, biuret, amidosulphuric acid, thiourea dioxide and urea.
The concentration of pyromellitic trimethylsilyl chloride solution is preferably 0.5-2g/L.
The solvent of pyromellitic trimethylsilyl chloride solution is preferably at least one of n-hexane, hexamethylene, normal heptane and toluene.
High flux and high retention ratio composite nanometer filtering film prepared by the above method.
Advantages of the present invention：
1. high flux and high retention ratio composite nanometer filtering film of the present invention can not only be used in aqueous systems, it is also applicable to organism
The separation of system, it is simple for process, it is easily operated.
2. aqueous phase monomers type used in interfacial polymerization of the present invention is more, can be obtained by adjusting their ratio
The composite nanometer filtering film with certain property of different structure, so that it is suitable for the separation of different systems.
3. the composite nanometer filtering film high flux and high retention ratio of the present invention, the stability of film is good, can be with the small object of molecular cut off
Matter.
Description of the drawings
Fig. 1 is the surface texture of untreated basement membrane.
Fig. 2 is the structure on the surface of the basement membrane after crosslinking.
Fig. 3 is the cross-sectional configuration of interfacial polymerization caudacoria.
Fig. 4 is the amplification of the cross-sectional configuration of interfacial polymerization caudacoria separating layer.
Fig. 5 is the surface texture of interfacial polymerization caudacoria.
Fig. 6 is infrared attenuation full reflection-Fourier transform infrared spectroscopy figure of film.
Specific implementation mode
With reference to specific embodiment, the present invention is further illustrated, and the embodiment of the present invention is to make this field
Technical staff better understood when the present invention, but the present invention is not imposed any restrictions.
Substance used in membrane separating property experiment is NaCl, Na2SO4、MgSO4、MgCl2, the test condition of experiment is：
25 DEG C, inorganic salt concentration is 5000ppm, and membrane separation plant is cross-flow filtration device.
Embodiment 1
A kind of high flux and high retention ratio composite nanometer filter membrane preparation method, includes the following steps：
(1) preparation of crosslinked porous support membrane：By the polyetherimide and N- methylpyrroles in advance through 60 DEG C of dry 12h
Alkanone mixes, and it is 19% to make the mass concentration of polyetherimide, and 12h is stirred at 60 DEG C, stands 10h deaerations, obtains casting solution,
Casting solution is toppled on polypropylene non-woven fabric, knifing, it is 100 μm to make the thickness of film, obtains wet film, volatilizees by 0s, and wet film is turned
It moves in 25 DEG C of water, impregnates 5min, take out, obtain polyetherimide supporting layer basement membrane, be dipped in the ethylenediamine water of a concentration of 3g/L
Cross-linking reaction 0.5h is carried out in solution, taking-up is rinsed with deionized water, and blots the moisture on surface, obtains crosslinked open support
Film；
(2) preparation of composite nanometer filtering film：Crosslinked porous support membrane is fixed among tablet and frame, is placed in 25 DEG C
30s in isoperibol topples over the thiosemicarbazide aqueous solution that mass concentration is 1% into frame, arranges solution after reacting 10s
Go out, be replaced in 25 DEG C of isoperibol, the moisture of remained on surface is blotted with filter paper, a concentration of 0.2g/L is toppled over into frame
Pyromellitic trimethylsilyl chloride hexane solution, react 30s, solution is discharged, by film in 50 DEG C of dry 30min, obtains composite nanometer filter
Film；It places it in the valve bag containing moisture and preserves.
The flux of gained film is 67.7L h-1m-2, filted chroma is NaCl, Na of 5000ppm2SO4、MgSO4、MgCl2It is molten
Liquid, rejection are respectively 79.5%, 92.3%, 93.8%, 95.6%, operating pressure 1.6MPa.
Embodiment 2
A kind of preparation method of high flux and high retention ratio composite nanometer filtering film, includes the following steps：
(1) preparation of crosslinked porous support membrane：By the polyetherimide and N in advance through 100 DEG C of dry 12h, N- diformazans
Base formamide mixes, and it is 22% to make the mass concentration of polyetherimide, and 6h is stirred at 90 DEG C, stands 6h deaerations, obtains casting solution,
Casting solution is toppled on polysulfones non-woven fabrics, knifing, it is 300 μm to make the thickness of film, wet film is obtained by the volatilization of 10s, by wet film
It is transferred in 50 DEG C of water, impregnates 120min, take out, obtain polyetherimide supporting layer basement membrane, be dipped in the second of a concentration of 120g/L
Cross-linking reaction 5h is carried out in diamines methanol solution, taking-up is rinsed with deionized water, and blots the moisture on surface, is obtained crosslinked more
Hole support membrane；
(2) preparation of composite nanometer filtering film：Crosslinked porous support membrane is fixed among tablet and frame, is placed in 60 DEG C
120s in isoperibol topples over the biuret aqueous solution that mass concentration is 4% into frame, and solution is discharged after reacting 120s,
It is replaced in 60 DEG C of isoperibol, the moisture of remained on surface is blotted with filter paper, the equal benzene of concentration 5g/L is toppled over into frame
Three formyl chloride cyclohexane solutions react 120s, solution are discharged, by film in 120 DEG C of dry 3min, obtains composite nanometer filtering film；It will
It is placed in the valve bag containing moisture and preserves.
The flux of gained film is 53.9L h-1m-2, filted chroma is the glucose solution of 10g/L, and rejection is
99.6%, operating pressure 1.6MPa.
Embodiment 3
A kind of preparation method of high flux and high retention ratio composite nanometer filtering film, includes the following steps：
(1) preparation of crosslinked porous support membrane：By the polyetherimide and N in advance through 100 DEG C of dry 8h, N- dimethyl
Acetamide mixes, and it is 22% to make the mass concentration of polyetherimide, and 6h is stirred at 60 DEG C, stands 14h deaerations, obtains casting solution,
Casting solution is toppled on polyester non-woven fabric, knifing, it is 300 μm to make the thickness of film, wet film is obtained by the volatilization of 60s, by wet film
It is transferred in 25 DEG C of water, impregnates 60min, take out, obtain polyetherimide supporting layer basement membrane (surface texture of basement membrane is shown in Fig. 1),
It is dipped in progress cross-linking reaction 5h in the ethylenediamine aqueous isopropanol of a concentration of 60g/L, taking-up is rinsed with deionized water, and blots table
The moisture in face obtains crosslinked porous support membrane (structure on the surface of the basement membrane after crosslinking is shown in Fig. 2)；
(2) preparation of composite nanometer filtering film：Crosslinked porous support membrane is fixed among tablet and frame, frame is
The polypropylene material frame of 19cm*17cm, is placed in 30s in 25 DEG C of isoperibol, and 100ml mass concentrations are toppled over into frame and are
Solution is discharged after 60s, is replaced in 25 DEG C of isoperibol, it is residual to blot surface with filter paper by 2% amidosulphuric acid aqueous solution
The moisture stayed topples over the n-heptane solution of the pyromellitic trimethylsilyl chloride of 100ml concentration 1g/L into frame, reacts 60s, solution is arranged
Go out, by film in 90 DEG C of dry 6min, obtains composite nanometer filtering film；It places it in the valve bag containing moisture and preserves.Composite nanometer filter
The cross-sectional configuration of film, the amplification of cross-sectional configuration of composite nanometer filtering film separating layer and the surface texture of composite nanometer filtering film are shown in respectively
Fig. 3, Fig. 4, Fig. 5.The infrared attenuation full reflection of film-Fourier transform infrared spectroscopy figure is shown in Fig. 6.
The flux of gained film is 59L h-1m-2, filted chroma is NaCl, Na of 5000ppm2SO4、MgSO4、MgCl2Solution,
Its rejection is respectively 91.9%, 99.6%, 99.5%, 97.9%, operating pressure 1.6MPa.
Embodiment 4
A kind of preparation method of high flux and high retention ratio composite nanometer filtering film, includes the following steps：
(1) preparation of crosslinked porous support membrane：By the polyetherimide and N in advance through 100 DEG C of dry 12h, N- diformazans
Base formamide mixes, and it is 18% to make the mass concentration of polyetherimide, and 6h is stirred at 90 DEG C, stands 6h deaerations, obtains casting solution,
Casting solution is toppled on polysulfones non-woven fabrics, knifing, it is 300 μm to make the thickness of film, wet film is obtained by the volatilization of 10s, by wet film
It is transferred in 50 DEG C of water, impregnates 120min, take out, obtain polyetherimide supporting layer basement membrane, be dipped in the second of a concentration of 120g/L
Cross-linking reaction 5h is carried out in diamines methanol solution, taking-up is rinsed with deionized water, and blots the moisture on surface, is obtained crosslinked more
Hole support membrane；
(2) preparation of composite nanometer filtering film：Crosslinked porous support membrane is fixed among tablet and frame, is placed in 60 DEG C
120s in isoperibol, the water phase aqueous solution that mass concentration is 4% is toppled over into frame, and water phase is that mass ratio is 1：1 dioxy
Change thiocarbamide and urea, solution is discharged after reacting 120s, is replaced in 60 DEG C of isoperibol, remained on surface is blotted with filter paper
Moisture, topple over the pyromellitic trimethylsilyl chloride solution of concentration 2g/L into frame, react 120s, the solvent of pyromellitic trimethylsilyl chloride solution
It is 1 for volume ratio:1 toluene and normal heptane, solution is discharged, and by film in 120 DEG C of dry 3min, obtains composite nanometer filtering film；By its
It is placed in the valve bag containing moisture and preserves.
The flux of gained film is 89L h-1m-2, filted chroma is NaCl, Na of 5000ppm2SO4、MgSO4、MgCl2Solution,
Its rejection is respectively 89.9%, 97.6%, 95.8%, 94.5%, operating pressure 1.6MPa.
Embodiment 5
A kind of preparation method of high flux and high retention ratio composite nanometer filtering film, includes the following steps：
(1) preparation of crosslinked porous support membrane：By the polyetherimide and N in advance through 100 DEG C of dry 12h, N- diformazans
Base formamide mixes, and it is 20% to make the mass concentration of polyetherimide, and 6h is stirred at 90 DEG C, stands 6h deaerations, obtains casting solution,
Casting solution is toppled on polysulfones non-woven fabrics, knifing, it is 300 μm to make the thickness of film, wet film is obtained by the volatilization of 10s, by wet film
It is transferred in 50 DEG C of water, impregnates 120min, take out, obtain polyetherimide supporting layer basement membrane, be dipped in the second of a concentration of 120g/L
Cross-linking reaction 5h is carried out in diamines methanol solution, taking-up is rinsed with deionized water, and blots the moisture on surface, is obtained crosslinked more
Hole support membrane；
(2) preparation of composite nanometer filtering film：Crosslinked porous support membrane is fixed among tablet and frame, is placed in 60 DEG C
120s in isoperibol topples over the aqueous solution of urea that mass concentration is 2% into frame, solution is discharged after 120s, sets again
In 60 DEG C of isoperibol, the moisture of remained on surface is blotted with filter paper, and the equal benzene front three of concentration 0.5g/L is toppled over into frame
Acyl chlorides cyclohexane solution reacts 60s, solution is discharged, by film in 70 DEG C of dry 6min, obtains composite nanometer filtering film；It places it in
It is preserved in valve bag containing moisture.
The flux of gained film is 45.8L h-1m-2, filted chroma is NaCl, Na of 5000ppm2SO4、MgSO4、MgCl2It is molten
Liquid, rejection are respectively 90.1%, 98.5%, 98.3%, 96.5%, operating pressure 1.6MPa.
Embodiment 6
A kind of preparation method of high flux and high retention ratio composite nanometer filtering film, includes the following steps：
(1) with 1 step of embodiment (1)；
(2) preparation of composite nanometer filtering film：Crosslinked porous support membrane is fixed among tablet and frame, is placed in 40 DEG C
60s in isoperibol, in the pyromellitic trimethylsilyl chloride hexane solution that a concentration of 1g/L is toppled over into frame, reacting will be molten after 60s
Liquid is discharged, and is replaced in 40 DEG C of isoperibol, removes the moisture of remained on surface, and it is 2% that mass concentration is toppled over into frame
Thiosemicarbazide aqueous solution, react 60s after solution is discharged, in 50 DEG C of dry 30min, obtain composite nanometer filtering film.
The flux of gained film is 67.8L h-1m-2, filted chroma is NaCl, Na of 5000ppm2SO4、MgSO4、MgCl2It is molten
Liquid, rejection are respectively 87.5%, 96.6%, 95.8%, 93.5%, operating pressure 1.6MPa.
Embodiment 7
A kind of preparation method of high flux and high retention ratio composite nanometer filtering film, includes the following steps：
(1) with 2 step of embodiment (1)；
(2) preparation of composite nanometer filtering film：Crosslinked porous support membrane is fixed among tablet and frame, is placed in 25 DEG C
120s in isoperibol topples over the pyromellitic trimethylsilyl chloride solution of a concentration of 0.2g/L into frame, pyromellitic trimethylsilyl chloride solution
Solvent is that volume ratio is 1：Solution is discharged after reacting 120s, is replaced in 25 DEG C of isoperibol by 1 normal heptane and n-hexane
In, the moisture of remained on surface is removed, the water phase aqueous solution that mass concentration is 4% is toppled over into frame, water phase is that mass ratio is 1：1
Thiourea dioxide and urea, react 120s after solution is discharged, in 70 DEG C of dry 10min, obtain composite nanometer filtering film.
The flux of gained film is 61.9L h-1m-2, filted chroma is the glucose solution of 10g/L, and rejection is
99.1%, operating pressure 1.6MPa.
Embodiment 8
A kind of preparation method of high flux and high retention ratio composite nanometer filtering film, includes the following steps：
(1) with 3 step of embodiment (1)；
(2) preparation of composite nanometer filtering film：Crosslinked porous support membrane is fixed among tablet and frame, is placed in 60 DEG C
30s in isoperibol, topples over the pyromellitic trimethylsilyl chloride cyclohexane solution of a concentration of 5g/L into frame, reacts solution after 30s
Discharge, is replaced in 60 DEG C of isoperibol, removes the moisture of remained on surface, and it is 1% that mass concentration is toppled over into frame
Solution is discharged after reacting 10s, in 120 DEG C of dry 3min, obtains composite nanometer filtering film by aqueous solution of urea.
The flux of gained film is 69.9L h-1m-2, filted chroma is the glucose solution of 10g/L, and rejection is
95.1%, operating pressure 1.6MPa.
Embodiment 9
A kind of preparation method of high flux and high retention ratio composite nanometer filtering film, includes the following steps：
(1) with 4 step of embodiment (1)；
(2) preparation of composite nanometer filtering film：Crosslinked porous support membrane is fixed among tablet and frame, is placed in 60 DEG C
30s in isoperibol topples over the pyromellitic trimethylsilyl chloride toluene solution of a concentration of 2g/L into frame, arranges solution after reacting 30s
Go out, be replaced in 60 DEG C of isoperibol, remove the moisture of remained on surface, the contracting that mass concentration is 1% is toppled over into frame
Solution is discharged after reacting 10s, in 120 DEG C of dry 3min, obtains composite nanometer filtering film by two urea aqueous solutions.
The flux of gained film is 79.0L h-1m-2, filted chroma is NaCl, Na of 5000ppm2SO4、MgSO4、MgCl2It is molten
Liquid, rejection are respectively 76.9%, 91.5%, 92.3%, 93.4%, operating pressure 1.6MPa.
Embodiment 10
A kind of preparation method of high flux and high retention ratio composite nanometer filtering film, includes the following steps：
(1) with 5 step of embodiment (1)；
(2) preparation of composite nanometer filtering film：Crosslinked porous support membrane is fixed among tablet and frame, is placed in 60 DEG C
30s in isoperibol topples over the pyromellitic trimethylsilyl chloride cyclohexane solution of a concentration of 0.5g/L into frame, will be molten after reaction 30s
Liquid is discharged, and is replaced in 60 DEG C of isoperibol, removes the moisture of remained on surface, and it is 1% that mass concentration is toppled over into frame
Amidosulphuric acid aqueous solution, react 10s after solution is discharged, in 120 DEG C of dry 3min, obtain composite nanometer filtering film.
The flux of gained film is 78.9L h-1m-2, filted chroma is the glucose solution of 10g/L, and rejection is
93.7%, operating pressure 1.6MPa.
Embodiment 11
A kind of preparation method of high flux and high retention ratio composite nanometer filtering film, includes the following steps：
(1) with 1 step of embodiment (1)；
(2) preparation of composite nanometer filtering film：Crosslinked porous support membrane is wrapped on the idler wheel of film preparation equipment, is placed in 25
DEG C isoperibol in 120s, being driven by idler wheel rotation makes the urine that the rotation of crosslinked porous support membrane is 1% by mass concentration
Plain aqueous solution comes from aqueous solution of urea back-out after reacting 120s, is replaced in 25 DEG C of isoperibol, removes remained on surface
Moisture is rotated by idler wheel and drives film rotation by the pyromellitic trimethylsilyl chloride hexane solution of a concentration of 5g/L, reaction 60s caudacorias from
Pyromellitic trimethylsilyl chloride hexane solution, which screws out, to be come, and in 50 DEG C of dry 30min, obtains composite nanometer filtering film.
The flux of gained film is 95.6L h-1m-2, filted chroma is NaCl, Na of 5000ppm2SO4、MgSO4、MgCl2It is molten
Liquid, rejection are respectively 66.7%, 89.6%, 89.9%, 93.8%, operating pressure 1.6MPa.
Embodiment 12
A kind of preparation method of high flux and high retention ratio composite nanometer filtering film, includes the following steps：
(1) with 2 step of embodiment (1)；
(2) preparation of composite nanometer filtering film：Crosslinked porous support membrane is wrapped on the idler wheel of film preparation equipment, is placed in 60
DEG C isoperibol in 30s, being driven by idler wheel rotation makes the amino that the rotation of crosslinked porous support membrane is 4% by mass concentration
Aqueous sulfuric acid screws out from amidosulphuric acid aqueous solution, be replaced in 60 DEG C of isoperibol, removes surface after reacting 10s
Remaining moisture is rotated by idler wheel and drives pyromellitic trimethylsilyl chloride cyclohexane solution of the film rotation by a concentration of 0.2g/L, reaction
120s caudacorias screw out to come from pyromellitic trimethylsilyl chloride cyclohexane solution, in 120 DEG C of dry 3min, obtain composite nanometer filtering film.
The flux of gained film is 45.9L h-1m-2, filted chroma is the glucose solution of 10g/L, and rejection is
99.7%, operating pressure 1.6MPa.
Embodiment 13
A kind of preparation method of high flux and high retention ratio composite nanometer filtering film, includes the following steps：
(1) with 3 step of embodiment (1)；
(2) preparation of composite nanometer filtering film：Crosslinked porous support membrane is wrapped on the idler wheel of film preparation equipment, is placed in 35
DEG C isoperibol in 60s, being driven by idler wheel rotation makes the contracting two that the rotation of crosslinked porous support membrane is 2% by mass concentration
Urea aqueous solution screws out from biuret aqueous solution, be replaced in 35 DEG C of isoperibol, removes remained on surface after reacting 60s
Moisture, rotated by idler wheel and drive film rotation by the pyromellitic trimethylsilyl chloride toluene solution of a concentration of 1g/L, reaction 30s caudacorias from
Pyromellitic trimethylsilyl chloride toluene solution, which screws out, to be come, and in 70 DEG C of dry 10min, obtains composite nanometer filtering film.
The flux of gained film is 90.8L h-1m-2, filted chroma is NaCl, Na of 5000ppm2SO4、MgSO4、MgCl2It is molten
Liquid, rejection are respectively 69.8%, 89.6%, 89.9%, 93.8%, operating pressure 1.6MPa.
Embodiment 14
A kind of preparation method of high flux and high retention ratio composite nanometer filtering film, includes the following steps：
(1) with 4 step of embodiment (1)；
(2) preparation of composite nanometer filtering film：Crosslinked porous support membrane is wrapped on the idler wheel of film preparation equipment, is placed in 35
DEG C isoperibol in 60s, driven by idler wheel rotation make the rotation of crosslinked porous support membrane by mass concentration be 2% it is thio
Semicarbazides aqueous solution is screwed out from thiosemicarbazide aqueous solution, be replaced in 35 DEG C of isoperibol, removes after reacting 60s
The moisture of remained on surface is rotated by idler wheel and drives pyromellitic trimethylsilyl chloride n-heptane solution of the film rotation by a concentration of 0.5g/L,
It reacts 30s caudacorias to screw out to come from pyromellitic trimethylsilyl chloride n-heptane solution, in 70 DEG C of dry 10min, obtains composite nanometer filtering film.
The flux of gained film is 67.8L h-1m-2, filted chroma is the glucose solution of 10g/L, and rejection is
90.9%, operating pressure 1.6MPa.
Embodiment 15
A kind of preparation method of high flux and high retention ratio composite nanometer filtering film, includes the following steps：
(1) with 5 step of embodiment (1)；
(2) preparation of composite nanometer filtering film：Crosslinked porous support membrane is wrapped on the idler wheel of film preparation equipment, is placed in 35
DEG C isoperibol in 60s, being driven by idler wheel rotation makes the water phase that the rotation of crosslinked porous support membrane is 2% by mass concentration
Aqueous solution, water phase are mass ratio 1:1 thiourea dioxide and urea is screwed out from water phase aqueous solution, be replaced in after reacting 60s
In 35 DEG C of isoperibol, the moisture of remained on surface is removed, the equal benzene for driving film rotation to pass through a concentration of 2g/L is rotated by idler wheel
Front three solution of acid chloride, it is 1 that the solvent of pyromellitic trimethylsilyl chloride solution, which is volume ratio,：1 n-hexane and hexamethylene reacts 30s caudacorias
It screws out to come from pyromellitic trimethylsilyl chloride solution, in 70 DEG C of dry 10min, obtains composite nanometer filtering film.
The flux of gained film is 108.7L h-1m-2, filted chroma is NaCl, Na of 5000ppm2SO4、MgSO4、MgCl2It is molten
Liquid, rejection are respectively 63.5%, 85.7%, 83.9%, 88.6%, operating pressure 1.6MPa.
Embodiment 16
A kind of preparation method of high flux and high retention ratio composite nanometer filtering film, includes the following steps：
(1) with 1 step of embodiment (1)；
(2) preparation of composite nanometer filtering film：Crosslinked porous support membrane is wrapped on the idler wheel of film preparation equipment, is placed in 25
DEG C isoperibol in 120s, being driven by idler wheel rotation makes the rotation of crosslinked porous support membrane by mass concentration be 0.2g/L's
The hexane solution of pyromellitic trimethylsilyl chloride screws out to come from the pyromellitic trimethylsilyl chloride hexane solution, again after reacting 120s
It is placed in 60 DEG C of isoperibol, removes the moisture of remained on surface, the urine for driving film rotation to pass through a concentration of 4% is rotated by idler wheel
Plain aqueous solution, reaction 120s caudacorias come from aqueous solution of urea back-out, in 50 DEG C of dry 30min, obtain composite nanometer filtering film.
The flux of gained film is 30.8L h-1m-2, filted chroma is the glucose solution of 10g/L, and rejection is
99.9%, operating pressure 1.6MPa.
Embodiment 17
A kind of preparation method of high flux and high retention ratio composite nanometer filtering film, includes the following steps：
(1) with 2 step of embodiment (1)；
(2) preparation of composite nanometer filtering film：Crosslinked porous support membrane is wrapped on the idler wheel of film preparation equipment, is placed in 60
DEG C isoperibol in 30s, being driven by idler wheel rotation makes the rotation of crosslinked porous support membrane by mass concentration be the equal of 5g/L
Three formyl chloride cyclohexane solution of benzene screws out from the pyromellitic trimethylsilyl chloride cyclohexane solution, is replaced in 60 after reacting 10s
DEG C isoperibol in, remove the moisture of remained on surface, rotated by idler wheel and film rotation is driven to pass through a concentration of 1% sulfo-amino
Urea aqueous solution, reaction 30s caudacorias screw out to come from thiosemicarbazide aqueous solution, in 120 DEG C of dry 3min, obtain composite nanometer filtering film.
The flux of gained film is 105.6L h-1m-2, filted chroma is NaCl, Na of 5000ppm2SO4、MgSO4、MgCl2It is molten
Liquid, rejection are respectively 66.1%, 87.3%, 85.2%, 89.0%, operating pressure 1.6MPa.
Embodiment 18
A kind of preparation method of high flux and high retention ratio composite nanometer filtering film, includes the following steps：
(1) with 3 step of embodiment (1)；
(2) preparation of composite nanometer filtering film：Crosslinked porous support membrane is wrapped on the idler wheel of film preparation equipment, is placed in 35
DEG C isoperibol in 60s, being driven by idler wheel rotation makes the rotation of crosslinked porous support membrane by mass concentration be the equal of 1g/L
Three formyl chloride toluene solution of benzene screws out from the pyromellitic trimethylsilyl chloride toluene solution, is replaced in 35 DEG C after reacting 60s
In isoperibol, the moisture of remained on surface is removed, is rotated by idler wheel and drives film rotation water-soluble by a concentration of 2% biuret
Liquid, reaction 60s caudacorias screw out to come from biuret aqueous solution, in 70 DEG C of dry 10min, obtain composite nanometer filtering film.
The flux of gained film is 78.0L h-1m-2, filted chroma is the glucose solution of 10g/L, and rejection is
89.6%, operating pressure 1.6MPa.
Embodiment 19
A kind of preparation method of high flux and high retention ratio composite nanometer filtering film, includes the following steps：
(1) with 4 step of embodiment (1)；
(2) preparation of composite nanometer filtering film：Crosslinked porous support membrane is wrapped on the idler wheel of film preparation equipment, is placed in 35
DEG C isoperibol in 60s, being driven by idler wheel rotation makes the rotation of crosslinked porous support membrane by mass concentration be 0.5g/L's
Pyromellitic trimethylsilyl chloride n-heptane solution is screwed out from the pyromellitic trimethylsilyl chloride n-heptane solution, is replaced in after reacting 60s
In 35 DEG C of isoperibol, the moisture of remained on surface is removed, the amino sulphur for driving film rotation to pass through a concentration of 2% is rotated by idler wheel
Aqueous acid, reaction 60s caudacorias screw out to come from amidosulphuric acid aqueous solution, in 70 DEG C of dry 10min, obtain composite nanometer filtering film.
The flux of gained film is 57.9L h-1m-2, filted chroma is the glucose solution of 10g/L, and rejection is
95.7%, operating pressure 1.6MPa.
Embodiment 20
A kind of preparation method of high flux and high retention ratio composite nanometer filtering film, includes the following steps：
(1) with 5 step of embodiment (1)；
(2) preparation of composite nanometer filtering film：Crosslinked porous support membrane is wrapped on the idler wheel of film preparation equipment, is placed in 35
DEG C isoperibol in 60s, being driven by idler wheel rotation makes the rotation of crosslinked porous support membrane by mass concentration be the equal of 2g/L
Benzene front three solution of acid chloride, it is 1 that the solvent of pyromellitic trimethylsilyl chloride solution, which is volume ratio,：1 n-hexane and hexamethylene, after reacting 60s
It screws out to come from the pyromellitic trimethylsilyl chloride solution, is replaced in 35 DEG C of isoperibol, removes the moisture of remained on surface, by
Idler wheel rotation drives film rotation by a concentration of 2% water phase aqueous solution, and water phase is mass ratio 1:1 thiourea dioxide and urine
Element, reaction 60s caudacorias screw out to come from water phase aqueous solution, in 70 DEG C of dry 10min, obtain composite nanometer filtering film.
The flux of gained film is 85.7L h-1m-2, filted chroma is NaCl, Na of 5000ppm2SO4、MgSO4、MgCl2It is molten
Liquid, rejection are respectively 79.5%, 92.1,93.5%, 96.5%, operating pressure 1.6MPa.
Claims (8)
1. a kind of preparation method of high flux and high retention ratio composite nanometer filtering film, it is characterized in that including the following steps：
(1) preparation of crosslinked porous support membrane：By the polyetherimide and organic solvent in advance through 60-100 DEG C of dry 8-12h
Mixing, it is 12%-22% to make the mass concentration of polyetherimide, and 6-12h is stirred at 60-90 DEG C, stands 6-14h deaerations, obtains
Casting solution topples over casting solution on non-woven fabrics, and knifing, it is 100-300 μm to make the thickness of film, is obtained by the volatilization of 0-60s wet
Wet film is transferred in 25-50 DEG C of water by film, impregnates 5-120min, is taken out, is obtained polyetherimide supporting layer basement membrane, be dipped in dense
Cross-linking reaction 0.5-5h is carried out in the ethylenediamine solution that degree is 30-120g/L, taking-up is rinsed with deionized water, and blots surface
Moisture obtains crosslinked porous support membrane；
(2) preparation of composite nanometer filtering film：It is prepared with a kind of following four kinds of the of method：
Method one：Crosslinked porous support membrane is fixed among tablet and frame, 30- in 25-60 DEG C of isoperibol is placed in
120s topples over the water phase aqueous solution that mass concentration is 1%-4% into frame, solution is discharged after reacting 10-120s, sets again
In 25-60 DEG C of isoperibol, the moisture of remained on surface is removed, the equal benzene front three of a concentration of 0.2-5g/L is toppled over into frame
Solution is discharged after reacting 30-120s, in 50-120 DEG C of dry 3-30min, obtains composite nanometer filtering film by solution of acid chloride；
Method two：Crosslinked porous support membrane is fixed among tablet and frame, 30- in 25-60 DEG C of isoperibol is placed in
In the pyromellitic trimethylsilyl chloride solution for toppling over a concentration of 0.2-5g/L into frame, solution is discharged after reacting 30-120s by 120s,
It is replaced in 25-60 DEG C of isoperibol, removes the liquid of remained on surface, it is 1%-4% that mass concentration is toppled over into frame
Water phase aqueous solution, react 10-120s after solution is discharged, in 50-120 DEG C of dry 3-30min, obtain composite nanometer filtering film；
Method three：Crosslinked porous support membrane is wrapped on the idler wheel of film preparation equipment, is placed in 25-60 DEG C of isoperibol
30-120s, being driven by idler wheel rotation keeps crosslinked porous support membrane rotation water-soluble by the water phase that mass concentration is 1%-4%
Liquid screws out from the water phase aqueous solution, be replaced in 25-60 DEG C of isoperibol, it is residual to remove surface after reacting 10-120s
The moisture stayed is rotated by idler wheel and drives pyromellitic trimethylsilyl chloride solution of the film rotation by a concentration of 0.2-5g/L, reacts 30-120s
Caudacoria screws out to come from pyromellitic trimethylsilyl chloride solution, in 50-120 DEG C of dry 3-30min, obtains composite nanometer filtering film；
Method four：Crosslinked porous support membrane is wrapped on the idler wheel of film preparation equipment, is placed in 25-60 DEG C of isoperibol
30-120s is driven the equal benzene front three for making crosslinked porous support membrane rotation by mass concentration for 0.2-5g/L by idler wheel rotation
Solution of acid chloride screws out from the pyromellitic trimethylsilyl chloride solution, is replaced in 25-60 DEG C of constant temperature ring after reacting 10-120s
In border, the liquid of remained on surface is removed, is rotated by idler wheel and drives water phase aqueous solution of the film rotation by a concentration of 1%-4%, instead
It answers 30-120s caudacorias to screw out to come from water phase aqueous solution, in 50-120 DEG C of dry 3-30min, obtains composite nanometer filtering film；
The solvent of the ethylenediamine solution is water, methanol or isopropanol；
The aqueous phase solution solute is at least one in thiosemicarbazide, biuret, amidosulphuric acid, thiourea dioxide and urea
Kind.
2. the preparation method of a kind of high flux and high retention ratio composite nanometer filtering film according to claim 1, it is characterized in that described
The mass concentration of polyetherimide is 18%-20% in step (1).
3. the preparation method of a kind of high flux and high retention ratio composite nanometer filtering film according to claim 1 or 2, it is characterized in that institute
It is at least one of n,N-Dimethylformamide, n,N-dimethylacetamide and N-Methyl pyrrolidone to state organic solvent.
4. the preparation method of a kind of high flux and high retention ratio composite nanometer filtering film according to claim 1, it is characterized in that described
The material of non-woven fabrics is polypropylene, polysulfones or polyester.
5. the preparation method of a kind of high flux and high retention ratio composite nanometer filtering film according to claim 1, it is characterized in that described
The mass concentration of step (2) water phase aqueous solution is 2%.
6. the preparation method of a kind of high flux and high retention ratio composite nanometer filtering film according to claim 1, it is characterized in that described
A concentration of 0.5-2g/L of pyromellitic trimethylsilyl chloride solution.
7. the preparation method of a kind of high flux and high retention ratio composite nanometer filtering film according to claim 1 or 6, it is characterized in that institute
The solvent for stating pyromellitic trimethylsilyl chloride solution is at least one of n-hexane, hexamethylene, normal heptane and toluene.
8. high flux and high retention ratio composite nanometer filtering film prepared by the method for one of claim 1-7.
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| CN108187511B (en) * | 2017-12-27 | 2021-03-26 | 东华大学 | High-flux high-rejection-rate polyamide composite reverse osmosis membrane and preparation method thereof |
| CN109876677A (en) * | 2019-04-16 | 2019-06-14 | 济宁安瑞生物科技有限公司 | A kind of vanillic aldehyde solvent-resistant compound nanofiltration membrane and its preparation method and application |
| CN111514769B (en) * | 2020-04-30 | 2021-12-14 | 万华化学集团股份有限公司 | Nanofiltration membrane for chlorine-resistant and pollution-resistant soft water and preparation method thereof |
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| CN102438735A (en) * | 2009-05-22 | 2012-05-02 | 通用电气公司 | Composite membrane and method of making |
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| CN103406030A (en) * | 2013-08-23 | 2013-11-27 | 哈尔滨工业大学 | Preparation method of gas-phase crosslinking modified polyetherimide nanofiltration membrane |
| CN103877876A (en) * | 2012-12-21 | 2014-06-25 | 中国科学院大连化学物理研究所 | Organic-inorganic hybrid polyamide nanofiltration membrane and preparation method thereof |
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| CN102438735A (en) * | 2009-05-22 | 2012-05-02 | 通用电气公司 | Composite membrane and method of making |
| CN102764599A (en) * | 2012-06-29 | 2012-11-07 | 清华大学 | Method for preparing nanometer material mixed matrix membrane |
| CN103877876A (en) * | 2012-12-21 | 2014-06-25 | 中国科学院大连化学物理研究所 | Organic-inorganic hybrid polyamide nanofiltration membrane and preparation method thereof |
| EP2835175A1 (en) * | 2013-06-07 | 2015-02-11 | Lg Chem, Ltd. | Polyamide-based water treatment separation membrane having excellent oxidation resistance and chlorine resistance and manufacturing method therefor |
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