CN109569328A - A kind of fluorine richness polyamide reverse osmose membrane preparation method - Google Patents
A kind of fluorine richness polyamide reverse osmose membrane preparation method Download PDFInfo
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- CN109569328A CN109569328A CN201811630789.3A CN201811630789A CN109569328A CN 109569328 A CN109569328 A CN 109569328A CN 201811630789 A CN201811630789 A CN 201811630789A CN 109569328 A CN109569328 A CN 109569328A
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- polyamide reverse
- fluorine richness
- fluorine
- film
- reverse osmose
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
- B01D71/06—Organic material
- B01D71/56—Polyamides, e.g. polyester-amides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
- B01D61/02—Reverse osmosis; Hyperfiltration ; Nanofiltration
- B01D61/025—Reverse osmosis; Hyperfiltration
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D67/00—Processes specially adapted for manufacturing semi-permeable membranes for separation processes or apparatus
- B01D67/0002—Organic membrane manufacture
Abstract
The present invention relates to a kind of fluorine richness polyamide reverse osmose membrane preparation methods, support substrate polyarylsulfone (PAS) film is first passed through to the water phase dissolved with diamine monomer, enter oily phase after drying, solvent in oily phase is n-hexane, solute in oily phase is acyl chlorides containing ternary or the monomer of ternary isocyanate functional group, after interfacial polymerization, into sink, it is dry after washed, into modified slot, modification liquid is housed inside modified slot, solute in modification liquid is fluorine-containing activated monomer, solvent in modification liquid is n-hexane, modification liquid carries out on the surface to film containing fluorine richness, finally it is dried to obtain fluorine richness polyamide reverse osmose membrane.The present invention is reacted using the monomer of fluoro-containing group and reaction active groups with the amino on polyamide reverse osmose membrane surface, will carry out improving its contamination resistance containing fluorine richness to polyamide reverse osmose membrane surface.
Description
Technical field
The present invention relates to a kind of fluorine richness polyamide reverse osmose membrane preparation methods, belong to reverse osmosis membrane functional modification technology
Field.
Background technique
Reverse osmosis technology is one kind using pressure difference as motive force, and the UF membrane operation of solvent is isolated from solution.Because
It is contrary with naturally osmotic, therefore claims reverse osmosis.According to the different osmotic of material, so that it may using greater than osmotic pressure
Reverse osmosis pressure, i.e. hyperfiltration achieve the purpose that separation, extraction, purifying and concentration.Reverse osmosis technology is net commonly used in household
Water dispenser industry, seawater fresh water；The sofening treatment of water；Wastewater treatment and food, medicine, the purification of chemical industry, concentration, separation
Etc..The core of reverse osmosis technology is reverse osmosis membrane.
Reverse osmosis membrane pollution refers to reverse osmosis membrane in use, particle, colloid, microorganism, salt in feed liquid etc.
Due to the physics between film, chemical action, is adsorbed in film surface or fenestra, deposits and membrane aperture is caused to become smaller or block, made
Film generates transmission flow and stalling characteristic and reduces, the irreversible change phenomenon of generation.Film is needed when generating seriously polluted to film
It is cleaned, reduces the service efficiency of film, and cleaned and can generate damage to film, shortened the service life of film, increase operation
Cost.Therefore, how to effectively control the critical issues that fouling membrane has become current reverse osmosis membrane field.Prepare anti-pollution reverse-osmosis
Film is the basic method for coping with reverse osmosis membrane pollution.
It is modified to the antifouling property of film, it is presently mainly modified to the hydrophilicity of film, such as woods Xiao Hong is using epoxy
Propyl alcohol modified polyamide reverse osmosis membrane, the effective antifouling property for improving film, achievement be published in " polymer material science with
Engineering " the 8th phase in 2018.Reverse osmosis membrane modified for fluorine material, studies less, Chinese patent: a kind of fluorine-containing polyamides at present
The preparation method of amine composite nanofiltration membrane, number of patent application: 201610129859.1, it is noted that a kind of fluorine-containing polyamides amine composite nanofiltration
Fluorochemical monomer Hexafluorobutyl mathacrylate is grafted in PA membrane by the preparation method of film by Michael addition reaction,
The antifouling property of film is improved significantly.
Summary of the invention
The present invention in view of the deficienciess of the prior art, provide a kind of fluorine richness polyamide reverse osmose membrane preparation method,
Specific technical solution is as follows:
A kind of fluorine richness polyamide reverse osmose membrane preparation method first passes through support substrate polyarylsulfone (PAS) film dissolved with diamine list
The water phase of body enters oily phase after dry, the solvent in oily phase is n-hexane, and the solute in oily phase is that acyl chlorides containing ternary or ternary are different
The monomer of cyanate functional group, into sink, is equipped with water after interfacial polymerization inside sink, dry after washed, enters
Modified slot, modified slot inside are equipped with modification liquid, and the solute in modification liquid is fluorine-containing activated monomer, and the solvent in modification liquid is positive oneself
Alkane, modification liquid carry out the surface to film to be finally dried to obtain fluorine richness polyamide reverse osmose membrane containing fluorine richness.
As an improvement of the above technical solution, the fluorine-containing activated monomer is 4- trifluoromethyl benzoyl chloride.
As an improvement of the above technical solution, the support substrate is polyarylsulfone (PAS) film, and the porosity of polyarylsulfone (PAS) film is 5-
30nm。
As an improvement of the above technical solution, the water phase is the aqueous solution of diamine, and the diamine is m-phenylene diamine (MPD),
The concentration of m-phenylene diamine (MPD) is 0.005-0.01g/L.
As an improvement of the above technical solution, the solute in the oily phase is pyromellitic trimethylsilyl chloride or 2,4,6- tri- isocyanic acids
Phenyl ester, it is described oil phase in solute concentration be 0.002g/L.
As an improvement of the above technical solution, the molar ratio of solute and solute in oily phase is (1.05- in the water phase
1.1):1。
As an improvement of the above technical solution, the fluorine-containing activated monomer is 4- trifluoromethyl benzoyl chloride, in modification liquid
Fluorine-containing activated monomer concentration be 0.001-0.005g/L.
Beneficial effects of the present invention:
The present invention is carried out using the amino of the monomer and polyamide reverse osmose membrane surface of fluoro-containing group and reaction active groups
Reaction will carry out polyamide reverse osmose membrane surface to improve its contamination resistance containing fluorine richness.
Detailed description of the invention
Fig. 1 is fluorine richness polyamide reverse osmose membrane preparation technology flow chart of the present invention；
Fig. 2 is the antifouling property test result figure for compareing fluorine richness polyamide reverse osmose membrane；
Fig. 3 is the antifouling property test result figure of fluorine richness polyamide reverse osmose membrane in the embodiment of the present invention 1~4；
Fig. 4 is the infrared of fluorine richness polyamide reverse osmose membrane in control fluorine richness polyamide reverse osmose membrane and Examples 1 to 4
Spectral characterization figure；
Fig. 5 is the hydrophilicity test chart for compareing fluorine richness polyamide reverse osmose membrane；
Fig. 6 is the hydrophilicity test chart of fluorine richness polyamide reverse osmose membrane in inventive embodiments 1；
Fig. 7 is the hydrophilicity test chart of fluorine richness polyamide reverse osmose membrane in inventive embodiments 2；
Fig. 8 is the hydrophilicity test chart of fluorine richness polyamide reverse osmose membrane in inventive embodiments 3；
Fig. 9 is the hydrophilicity test chart of fluorine richness polyamide reverse osmose membrane in inventive embodiments 4；
Figure 10 is the reactive mode formula of invention example 1.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
Embodiment 1
Support substrate polyarylsulfone (PAS) film is first passed through into the water phase dissolved with p-phenylenediamine monomer, the concentration of p-phenylenediamine is
0.005g/L enters oily phase after dry, the solvent in oily phase is n-hexane, and the solute in the oil phase is pyromellitic trimethylsilyl chloride,
The concentration of pyromellitic trimethylsilyl chloride is 0.002g/L, after interfacial polymerization, into sink, water is housed inside sink, washed
After dry, into modified slot, modification liquid is housed inside modified slot, the solute in modification liquid is 4- trifluoromethyl benzoyl chloride, is changed
Property liquid in solvent be n-hexane, the concentration of solute is 0.001g/L in modification liquid, and modification liquid will carry out the surface of film fluorine-containing
It is modified, finally it is dried to obtain fluorine richness polyamide reverse osmose membrane.
Embodiment 2
Support substrate polyarylsulfone (PAS) film is first passed through into the water phase dissolved with p-phenylenediamine monomer, the concentration of p-phenylenediamine is 0.01g/
L enters oily phase after dry, the solvent in oily phase is n-hexane, and the solute in the oil phase is pyromellitic trimethylsilyl chloride, equal benzene front three
The concentration of acyl chlorides is 0.002g/L, after interfacial polymerization, into sink, water is housed inside sink, dry after washed, into
Enter modified slot, modification liquid is housed inside modified slot, the solute in modification liquid is 4- trifluoromethyl benzoyl chloride, molten in modification liquid
Agent is n-hexane, and the concentration of solute is 0.005g/L in modification liquid, and the surface to film finally do containing fluorine richness by modification liquid
It is dry to obtain fluorine richness polyamide reverse osmose membrane.
Embodiment 3
Support substrate polyarylsulfone (PAS) film is first passed through into the water phase dissolved with p-phenylenediamine monomer, the concentration of p-phenylenediamine is
0.005g/L enters oily phase after dry, the solvent in oily phase is n-hexane, and the solute in the oil phase is 2,4,6- tri- isocyanic acids
The concentration of phenyl ester, 2,4,6- tri- phenyl isocyanates is 0.002g/L, after interfacial polymerization, into sink, is filled inside sink
There is water, it is dry after washed, into modified slot, modification liquid is housed inside modified slot, the solute in modification liquid is 4- trifluoromethyl
Chlorobenzoyl chloride, the solvent in modification liquid are n-hexane, and the concentration of solute is 0.001g/L in modification liquid, and modification liquid is by the table to film
Face carries out finally being dried to obtain fluorine richness polyamide reverse osmose membrane containing fluorine richness.
Embodiment 4
Support substrate polyarylsulfone (PAS) film is first passed through into the water phase dissolved with p-phenylenediamine monomer, the concentration of p-phenylenediamine is 0.01g/
L enters oily phase after dry, the solvent in oily phase is n-hexane, and the solute in the oil phase is 2,4,6- tri- phenyl isocyanates, and 2,
The concentration of 4,6- tri- phenyl isocyanates is 0.002g/L, after interfacial polymerization, into sink, water, warp is housed inside sink
It is dry after washing, into modified slot, modification liquid is housed inside modified slot, the solute in modification liquid is 4- trifluoromethylbenzoyl
Chlorine, the solvent in modification liquid are n-hexane, and the concentration of solute is 0.005g/L in modification liquid, and modification liquid will carry out the surface of film
Containing fluorine richness, it is finally dried to obtain fluorine richness polyamide reverse osmose membrane.
Blank test
Support substrate polyarylsulfone (PAS) film is first passed through into the water phase dissolved with p-phenylenediamine monomer, the concentration of p-phenylenediamine is
0.005g/L enters oily phase after dry, the solvent in oily phase is n-hexane, and the solute in oily phase is pyromellitic trimethylsilyl chloride, equal benzene
The concentration of three formyl chlorides is 0.002g/L, after interfacial polymerization, into sink, water is housed inside sink, dry after washed
It is dry, obtain control fluorine richness polyamide reverse osmose membrane.
Film properties test
1), antifouling property is tested
The antifouling property of film is assessed by cross-flow filtration test macro, mainly bovine serum albumin(BSA) (BSA) is selected to make
For pollutant.The relative molecular mass of BSA is 66000Dalton, and the concentration of BSA is 500mg/L in feeding liquid.It will be to be tested
Film is mounted in the membrane cisterna of plate film device, first carries out precompressed to film with the NaCl solution of 2g/L in 4MPa, 25 DEG C；It is reached to flux
Pressure is down to 1.5MPa after to stabilization, then in 1.5MPa, the permeance property of 25 DEG C of NaCl solutions with 2g/L, after stabilization
Permeation flux be denoted as F0；The mixed solution that feeding liquid is changed into the NaCl and 500mg/LBSA of 2g/L, in 1.5MPa, 25 DEG C of items
The permeance property of test film under part stops test when flux to be infiltrated basically reaches stable；It changes feeding liquid into deionized water, uses
Water rinses out the pollutant for being deposited on film surface, repeated flushing 1h；Finally, feeding liquid is changed into the NaCl solution of 2g/L,
The permeance property of 1.5MPa, 25 DEG C of test films, and the permeation flux of the film after stabilization is denoted as Ft.Membrane flux recovery rate
(FRR) calculation formula are as follows: FRR=Ft/F0.The flux recovery rate of film is higher, indicates that cleaning efficiency is higher, antifouling property
Better.
In conjunction with Fig. 2 and Fig. 3, it is known that significantly improved by the flux recovery rate of the polyamide reverse osmose membrane of fluorine richness, film
Resistance tocrocking be significantly improved.
2), infrared spectrum characterization
The chemical structure of Modified Membrane, using decaying In situ ATR-FTIR characterization.First by Modified Membrane at 40 DEG C before test
Dry 3h, then cuts the film of about 1cm × 1cm and is tested with the ATR reflection unit of equipment in vacuum drying oven.
Referring to fig. 4, from infrared spectroscopy as can be seen that by the modified polyamide in fluorine surface in 963cm-1Place occurs apparent
C-F key absorption peak.
3), hydrophilicity is tested
Contact angle reflects the hydrophilicity of film, and the smaller hydrophily for showing film of contact angle is better.First by film 40 before test
DEG C vacuum drying oven in dry 3h, the diaphragm sticking double faced adhesive tape of suitable size is cut on glass slide, with drop method measurement film of lying
The contact angle numerical value of upper 5 positions, is averaged.In Fig. 5~9, contact angle θ.
In the above-described embodiments, unit is quality-volumetric concentration that g/L refers to solution.
Fig. 1 is fluorine richness polyamide reverse osmose membrane preparation technology flow chart of the present invention.Figure 10 is the side that example 1 is reacted
Formula.
In the preparation process of fluorine richness polyamide reverse osmose membrane, support substrate is polyarylsulfone (PAS) film, the hole of polyarylsulfone (PAS) film
Important influence is distributed on counterdie for amine in rate, and the aperture of polyarylsulfone (PAS) film the big more is conducive to the transmission of solvent, gathers
The porosity of fragrant sulfone film is in 5-30nm.Wherein, the molar ratio of solute and solute in oily phase is (1.05-1.1) in water phase: 1, it is ensured that
With the presence of extra amino after oily phase reaction.
The present invention is carried out using the amino of the monomer and polyamide reverse osmose membrane surface of fluoro-containing group and reaction active groups
Reaction will carry out polyamide reverse osmose membrane surface to improve its contamination resistance containing fluorine richness.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (7)
1. a kind of fluorine richness polyamide reverse osmose membrane preparation method, it is characterised in that: first pass through support substrate polyarylsulfone (PAS) film molten
There is the water phase of diamine monomer, oily phase is entered after dry, the solvent in oily phase is n-hexane, and the solute in oily phase is acyl containing ternary
Chlorine or the monomer of ternary isocyanate functional group, into sink, are equipped with water after interfacial polymerization inside sink, washed
After dry, into modified slot, modification liquid is housed inside modified slot, the solute in modification liquid is fluorine-containing activated monomer, in modification liquid
Solvent be n-hexane, modification liquid carries out the surface to film to be finally dried to obtain fluorine richness polyamide reverse osmosis containing fluorine richness
Film.
2. a kind of fluorine richness polyamide reverse osmose membrane preparation method according to claim 1, it is characterised in that: described fluorine-containing
Activated monomer is 4- trifluoromethyl benzoyl chloride.
3. a kind of fluorine richness polyamide reverse osmose membrane preparation method according to claim 1, it is characterised in that: the support
Bottom is polyarylsulfone (PAS) film, and the porosity of polyarylsulfone (PAS) film is 5-30nm.
4. a kind of fluorine richness polyamide reverse osmose membrane preparation method according to claim 1, it is characterised in that: the water phase
For the aqueous solution of diamine, the diamine is m-phenylene diamine (MPD), and the concentration of m-phenylene diamine (MPD) is 0.005-0.01g/L.
5. a kind of fluorine richness polyamide reverse osmose membrane preparation method according to claim 4, it is characterised in that: the oil phase
In solute be pyromellitic trimethylsilyl chloride or 2,4,6- tri- phenyl isocyanates, the concentration of solute is 0.002g/L in the oil phase.
6. a kind of fluorine richness polyamide reverse osmose membrane preparation method according to claim 5, it is characterised in that: the water phase
The molar ratio of middle solute and solute in oily phase is (1.05-1.1): 1.
7. a kind of fluorine richness polyamide reverse osmose membrane preparation method according to claim 1, it is characterised in that: described fluorine-containing
Activated monomer is 4- trifluoromethyl benzoyl chloride, and the concentration of the fluorine-containing activated monomer in modification liquid is 0.001-0.005g/L.
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Cited By (2)
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| CN113663528A (en) * | 2021-08-12 | 2021-11-19 | 中国石油大学(华东) | Preparation method of fluorine-containing oil-water separation membrane with high oil pollution resistance and stability |
| CN114210214A (en) * | 2021-12-20 | 2022-03-22 | 天津大学浙江研究院 | Preparation method of fluorine-containing loose polyamide nanofiltration membrane |
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