CN110479100A - A kind of preparation method of acidproof Nano filtering composite membrane material - Google Patents
A kind of preparation method of acidproof Nano filtering composite membrane material Download PDFInfo
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- CN110479100A CN110479100A CN201910773164.0A CN201910773164A CN110479100A CN 110479100 A CN110479100 A CN 110479100A CN 201910773164 A CN201910773164 A CN 201910773164A CN 110479100 A CN110479100 A CN 110479100A
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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
- B01D61/027—Nanofiltration
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
- B01D65/10—Testing of membranes or membrane apparatus; Detecting or repairing leaks
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D69/00—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
- B01D69/10—Supported membranes; Membrane supports
- B01D69/105—Support pretreatment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D69/00—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
- B01D69/12—Composite membranes; Ultra-thin membranes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D69/00—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
- B01D69/12—Composite membranes; Ultra-thin membranes
- B01D69/125—In situ manufacturing by polymerisation, polycondensation, cross-linking or chemical reaction
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2323/00—Details relating to membrane preparation
- B01D2323/50—Control of the membrane preparation process
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2325/00—Details relating to properties of membranes
- B01D2325/30—Chemical resistance
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Abstract
The invention belongs to the technical fields of composite material preparation, and in particular to a kind of acidproof Nano filtering composite membrane material preparation method.Repeatedly replace coating reaction monomers using the principle of ultra-thin crosslinking coating on ultrafiltration support counterdie surface, under the effect of the catalyst, is prepared by heating aftertreatment technology.This method preparation process is simple, and the acidproof Nano filtering composite membrane material of preparation is applied in the highly acid material solution within the scope of pH value 1-7 and outside pH value range, and the following accurate feed separation field in extreme circumstances has wide application prospect.
Description
Technical field
The invention belongs to the technical fields of composite material preparation, and in particular to a kind of acidproof Nano filtering composite membrane material preparation side
Method.
Background technique
Material precision separation in industrial production occupies always the important composition of production cost.Such as the amino of high added value
Sour small molecule, polypeptide, the precious metal separation in metal smelt, high-precision silicon separating-purifying etc..However most of industrial production is raw
It produces medium and all contains acid, alkali or organic solvent, realize that the material precision separating difficulty of above-mentioned medium is very huge.Traditional extraction behaviour
It is not only difficult to meet environmental requirements, separative efficiency is also very low.
Since membrane separation technique to last century invention, especially reverse osmosis and Nanofiltration-membrane technique invention is quickly pushed
The application of water treatment field depth separation, becomes the most important water treatment technology of today's society.However business conventional at present is received
Filter and reverse osmosis membrane materials structure be not acidproof, it is difficult to directly apply in complex materials separation.In addition to this, conventional business is received
Filter membrane product in the industrial production to be directly separated application case less, main cause includes not acidproof, not anti-pollution, at high cost
Etc. reasons.
Therefore acidproof nanofiltration membrane material is developed with very wide application prospect.As United States Patent (USP) US20030141242,
US6783711, US20120152839 etc. and Chinese patent 103386255B, 105498549B, 107349804A etc. are respectively
Report the technology of preparing of acidproof nanofiltration membrane material.The field is also always the hot spot direction of academic and business circles concern.
Summary of the invention
For the acid nonfast problem of commercial nanofiltration membrane product of prior art routine, it is multiple that the present invention provides a kind of acidproof nanofiltration
Membrane material preparation method for material is closed, to solve the above technical problems.I.e. on porous ultrafiltration support counterdie, under the effect of the catalyst,
The monomer crosslinked coating of multicomponent prepares Multilayer ultrathin nano coating, is finally completed the preparation of acidproof Nano filtering composite membrane material.This side
The acidproof Nano filtering composite membrane material of method preparation has broad prospects in the separation application of acidic aqueous solution system.
This method preparation process is simple, and the acidproof Nano filtering composite membrane material of preparation is within the scope of pH value 1-7 and pH value model
It encloses and is applied in outer highly acid material solution, there is wide application to push away in the following accurate feed separation field in extreme circumstances
Wide prospect.
The technical solution of the present invention is as follows:
A kind of acidproof Nano filtering composite membrane material preparation method, step are as follows: utilize ultra-thin crosslinking on ultrafiltration support counterdie surface
Repeatedly alternately coating reaction monomers are prepared by heating aftertreatment technology the principle of coating under the effect of the catalyst.
Further, after heat treatment, R-S-C-R` or the R-C-O-R` knot of crosslinking are formed after the reaction monomers are reacted
Structure.
A kind of acidproof Nano filtering composite membrane material preparation method, comprising the following steps:
(1) cleaning ultrafiltration supports counterdie, removes film surface impurity；
(2) the monomer solution A for preparing certain mass concentration applies the support of ultrafiltration described in step (1) counterdie surface
It covers, controls coating time 10-600s, remove residual liquid；
(3) the monomer B solution for preparing certain mass concentration applies the support of ultrafiltration described in step (2) counterdie surface
It covers, controls coating time 10-600s, remove residual liquid；
(4) repeating 2-8 step, (process of 2- (3), coating finish, and the ultrafiltration after being coated supports counterdie；
(5) the ultrafiltration support counterdie after being coated step (4) is heat-treated, and 30-100 DEG C of heat treatment temperature, heat
Handle time 30-900s；
(6) above-mentioned steps (5) composite film material is passed through to the hydrochloric acid solution washing by soaking of 5-10%, wash temperature is
25-80 DEG C, wash time 10-180min；
(7) by treated described in step (6), composite film material is taken out, and after 3% glycerine water solution impregnates 5min, is taken
It is sealed out.
Above-mentioned steps (1) ultrafiltration support counterdie can be polymerizable material ultrafiltration membrane, Inorganic Ultrafiltration Membrane, further excellent
Choosing, polymerizable material ultrafiltration membrane includes polysulfone ultrafiltration membrane, poly (ether-sulfone) ultrafiltration membrane, polyacrylonitrile ultrafiltration film, Kynoar ultrafiltration
Film, polyethylene ultrafiltration membrane, polypropylene ultrafiltration membrane, polyether-ether-ketone ultrafiltration membrane；Further preferably, Inorganic Ultrafiltration Membrane includes Ceramic excessive filtration
Film and inorganic ultrafiltration membrane with acid-resistant property.Use above-mentioned organic or inorganic material ultrafiltration membrane as support bottom
Film can guarantee acidproof Nano filtering composite membrane material selection intensity and acid resistance.
Above-mentioned steps (1) ultrafiltration supports counterdie, and form can be flat, hollow fiber form, tubular type, rolled film
Pattern.It can be prepared using the ultrafiltration support counterdie of above-mentioned different shape compound suitable for the acidproof nanofiltration of different application scene
Film product enriches the model of product.
In above-mentioned steps (2), the mass concentration of monomer solution A is 0.1%-3%.
In above-mentioned steps (2), the catalyst of 0.05-0.3g/L, catalyst choice such as carbonic acid are added in monomer solution A
Sodium, potassium hydroxide, sodium hydroxide, quaternary ammonium salt one or more mixture.Can significantly it be shortened using above-mentioned catalyst proof
Crosslinking time.
In above-mentioned steps (3), the mass concentration of monomer B solution is 0.1-3%.
In above-mentioned steps (2), in monomer solution A, monomer A is alcohol, mercaptan, the polyphenol of difunctional or trifunctional；It is molten
Agent is the mixture of one or more of water, ethyl alcohol, propyl alcohol, acetone.Choose the monomer A of difunctional or trifunctional, energy
Enough significantly improve the degree of cross linking of nano coating.
In above-mentioned steps (3), monomer B solution, monomer B is the organic epoxy small molecule of trifunctional, and structural formula is as follows:
Wherein in structural formula, R can be fat hydrocarbon chain structure, aromatic ring structure, aliphatic ring structure, heterocycle structure, into one
Preferably, monomer B is glycerol tripropoxy triglycidyl ether (CAS:78366-85-5), 1,3,5- three-glycidyl-S- to step
Triazinetrione (TGIC) (CAS:2451-62-9) or triglycidyl group para-aminophenol (CAS:5026-74-4).
In above-mentioned steps (3), monomer B solution, solvent is ethyl alcohol, in hexane, isoparaffin, petroleum ether, toluene, dimethylbenzene
One or more of mixtures.
In above-mentioned steps (3), monomer B solution, in order to increase the solubility of monomer, solution process for preparation is increased
The acetone auxiliary agent of 0.05-5mL/L.Facts proved that can quickly dissolve monomer B using acetone auxiliary agent and form uniform solution, it can
Guarantee the uniformity of nano coating.
In above-mentioned steps (2) and (3), the removal residual liquid can use air knife purging, also can use centrifugal rotary
It is dry, it can also be in such a way that blotting paper blots.Residual liquid is removed using the above method, it can be ensured that nano coating is thinner,
The product permeance property of preparation is more preferable.
The monomer A and monomer B solution of certain mass concentration described in above-mentioned steps, when step (5) are heat-treated, mutually
Between chemical crosslink reaction occurs.Nano coating is prepared by monomer A and monomer B cross-linking reaction, to form composite membrane
Material, structural stability is more preferably.
Above-mentioned alternately coating monomer solution A and monomer B solution, are completed step (2) and (3), are as prepared for the painting of 1 layer function
Layer, repetitive coatings (2)-(3) one circulation are to be prepared for 1 layer function coating, and repeating n times is to be prepared for n-layer functional coating.
Alternately coating monomer A and monomer B solution, coating procedure can be centrifugal rotation coating, gas phase described in above-mentioned steps
Deposition, atomizing spraying etc..It selects above-mentioned technique to be coated, its advantage is that the usage amount of medicament can be saved, reduces and produce
Product production cost.
After above-mentioned steps (5) heat treatment, R-S-C-R` or the R-C-O-R` knot of crosslinking are formed after the A, B monomer are reacted
Structure.Heat treatment further promotes to form above-mentioned nano coating structure, which keeps stablizing in acid environment for a long time, it is ensured that product
Service performance and the service life.
The beneficial effects of the present invention are, used monomer be it is low in cost, nontoxic, preparation process is simple, preparation
Material acid-resistant stability is good.
The present invention is based on efficient " click chemistry " principles of heteroatoms medium aquamarine, in ultrafiltration supporting body surface Quick cross-linking
Ultrathin nanometer hole coating is coated, and the primary structure in cross-linked coating is mainly C-O C-S key, acid resistance with higher
Matter.
It can be within the scope of pH value 1-7 and outside pH value range by acidproof Nano filtering composite membrane material prepared by this method
It is applied in strongly acidic aqueous solution, can be used for the desalination of acid water process, as titanium white production, rare-earth smelting, lead storage battery return
The complexity water treatment field such as receipts, smelting iron and steel, chemical fibre, zero discharge of industrial waste water and recycling and landfill leachate, and system
The fields such as separation concentration of high added value organic matter, organic acid in medicine industry.
In short, the present invention makes its crosslinking coating by supporting film surface alternately coating reactable monomer solution in ultrafiltration
Nano porous layer is formed, the technical process is simple, and it is convenient to operate, and is easy to large-scale production.The invention enriches acidproof nanofiltration membrane
The research and development of product and production thinking, the acidproof Nano filtering composite membrane material of preparation have a vast market foreground.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, for those of ordinary skill in the art
Speech, without creative efforts, is also possible to obtain other drawings based on these drawings.
Fig. 1 is the schematic diagram of nano coating cross-linked structure prepared by the embodiment of the present invention 5, it can be seen that mostly with carbon
Heterodesmic form combines.
Fig. 2 is the acidproof Nano filtering composite membrane surface atom force microscope photo of the embodiment of the present invention 5, can from figure
Out, the acidproof Nano filtering composite membrane surface prepared using this method is more smooth, average surface roughness 8nm.
Specific embodiment
Technical solution in order to enable those skilled in the art to better understand the present invention, below in conjunction with of the invention real
The attached drawing in example is applied, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described implementation
Example is only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, this field is common
Technical staff's every other embodiment obtained without making creative work, all should belong to protection of the present invention
Range.
It is that following embodiments use the preparation method is as follows:
A kind of acidproof Nano filtering composite membrane material preparation method, comprising the following steps:
(1) cleaning ultrafiltration supports counterdie, removes film surface impurity；The ultrafiltration support counterdie can be super for polymerizable material
Filter membrane, Inorganic Ultrafiltration Membrane, further preferably, polymerizable material ultrafiltration membrane include polysulfone ultrafiltration membrane, poly (ether-sulfone) ultrafiltration membrane, polypropylene
Nitrile ultrafiltration membrane, polyvinylidene fluoride (PVDF) ultrafiltration membrane, polyethylene ultrafiltration membrane, polypropylene ultrafiltration membrane, polyether-ether-ketone ultrafiltration membrane；It is further excellent
Choosing, Inorganic Ultrafiltration Membrane includes ceramic super-filtering film and other inorganic ultrafiltration membranes with acid-resistant property.The ultrafiltration supports bottom
Film, form can be flat, hollow fiber form, tubular type, rolled film pattern.
(2) the monomer solution A (mass concentration 0.1-3%) for preparing certain mass concentration, to ultrafiltration described in step (1)
Support counterdie surface is coated, and coating time 10-600s is controlled, and removes residual liquid；Monomer A is difunctional or trifunctional
Alcohol, the mercaptan, polyphenol of group；Solvent is the mixture of one or more of water, ethyl alcohol, propyl alcohol, acetone.In step (2), monomer
The catalyst of 0.05-0.3g/L is added in solution A, catalyst is sodium carbonate, potassium hydroxide, sodium hydroxide, quaternary ammonium salt one kind
Or several mixture；
(3) the monomer B solution (mass concentration 0.1-3%) for preparing certain mass concentration, to ultrafiltration described in step (2)
Support counterdie surface is coated, and coating time 10-600s is controlled, and removes residual liquid；Monomer B solution, monomer B are trifunctional
The organic epoxy small molecule of group, structural formula are as follows:
Wherein in structural formula, R can be fat hydrocarbon chain structure, aromatic ring structure, aliphatic ring structure, heterocycle structure, into one
Preferably, monomer B is glycerol tripropoxy triglycidyl ether (CAS:78366-85-5), 1,3,5- three-glycidyl-S- to step
Triazinetrione (TGIC) (CAS:2451-62-9) or triglycidyl group para-aminophenol (CAS:5026-74-4).Solvent is second
One or more of alcohol, hexane, isoparaffin, petroleum ether, toluene, dimethylbenzene mixture.
In above-mentioned steps (2) and (3), the removal residual liquid can use air knife purging, also can use centrifugal rotary
It is dry, residual liquid surface liquid can also be removed in such a way that blotting paper blots.
Alternately coating monomer A and monomer B solution, coating procedure can be centrifugal rotation coating, gas phase described in above-mentioned steps
Deposition and atomizing spraying etc..
In step (3), monomer B solution, in order to increase the solubility of monomer, solution process for preparation increases 0.05-
The acetone auxiliary agent of 5mL/L.
(4) repeating 2-8 step, (process of 2- (3), coating finish, and the ultrafiltration after being coated supports counterdie；
(5) the ultrafiltration support counterdie after being coated step (4) is heat-treated, and 30-100 DEG C of heat treatment temperature, heat
Handle time 30-900s；After step (5) heat treatment, the R-S-C-R` or R-C-O- of crosslinking are formed after the A, B monomer are reacted
R` structure.
(6) above-mentioned steps (5) composite film material is passed through to the hydrochloric acid solution washing by soaking of 5-10%, wash temperature is
25-80 DEG C, wash time 10-180min；
(7) by treated described in step (6), composite film material is taken out, and after 3% glycerine water solution impregnates 5min, is taken
It is sealed out.
In above-mentioned steps (2), in above-mentioned steps (2), the catalyst of 0.05-0.3g/L, such as carbon are added in monomer solution A
The mixture of the one or more such as sour sodium, potassium hydroxide, sodium hydroxide quaternary ammonium salt.It can significantly be contracted using above-mentioned catalyst proof
Short crosslinking time.
In above-mentioned steps (3), monomer B solution, in order to increase the solubility of monomer, solution process for preparation is increased
0.05-0.5ml/L acetone auxiliary agent, using acetone auxiliary agent, facts proved that can quickly dissolve monomer B and form uniform solution, energy
Enough guarantee the uniformity of nano coating.
The method and performance table of 1 embodiment 1-6 of table
Composite film material performance test methods are as follows
To the salt rejection rate and water flux of the cross-flow test of 2000ppm aqueous sodium persulfate solution under 25 DEG C, operating pressure 1MPa.
The salt rejection rate of metabisulfite solution is calculated according to formula (1):
Wherein, Cp (unit: ppm) is the concentration of metabisulfite solution in filtrate after film test is filtered, C0(unit: ppm) is
The concentration of stoste metabisulfite solution.
The water flux of metabisulfite solution is calculated according to formula (2):
Wherein water flux is defined as: test membrane area S (unit: m2) in testing time Δ T (unit: hour), institute
Obtain the V (unit: L) of filtrate volume.
PEG method tests the molecular cut off of above-mentioned composite membrane, i.e. the rejection molecular weight that is 90% corresponding polyethylene glycol.
The calculating of its rejection is calculated according to formula (3):
Wherein, the concentration that Cp (unit: ppm) is PEG in filtrate after film test is filtered, C0(unit: ppm) is in stoste
The concentration of PEG.
Experimental Comparison example 1
The acid resistance of Nano filtering composite membrane is tested
By the acidproof Nano filtering composite membrane of preparation and common commercial polyamide nanofiltration membrane in batches simultaneously in 20% sulfuric acid, 20% salt
Acid and 4% nitric acid solution in immersion test, be often soaked for a period of time in experimentation and be sampled test its is right
The cutoff performance of the magnesium sulfate neutral aqueous solution of 2000ppm, rejection (R) and water flux (J) are according to formula (1) and formula
(2) it is calculated, acquired results are as shown in table 1 below.
The acidproof Nano filtering composite membrane of table 2 is after acid solution immersion treatment to Adlerika strainability data
By table 2, it can be seen that, the acidproof Nano filtering composite membrane prepared using method of the invention is handled by three kinds of acid solutions
Afterwards, 90% or more still can achieve to the removal rate of neutral Adlerika, and existing customary commercial polyamide nanofiltration membrane exists
It is very low to the rejection of magnesium sulfate after test 3 days, illustrate that its nano coating structure has been destroyed, acid resistance is poor.
Although by reference to attached drawing and combining the mode of preferred embodiment to the present invention have been described in detail, the present invention
It is not limited to this.Without departing from the spirit and substance of the premise in the present invention, those of ordinary skill in the art can be to the present invention
Embodiment carry out various equivalent modifications or substitutions, and these modifications or substitutions all should in covering scope of the invention/appoint
What those familiar with the art in the technical scope disclosed by the present invention, can easily think of the change or the replacement, answer
It is included within the scope of the present invention.Therefore, protection scope of the present invention is answered described is with scope of protection of the claims
It is quasi-.
Claims (10)
1. a kind of acidproof Nano filtering composite membrane material preparation method, which is characterized in that step are as follows: utilized on ultrafiltration support counterdie surface
Repeatedly alternately coating reaction monomers pass through heating aftertreatment technology system under the effect of the catalyst to the principle of ultra-thin crosslinking coating
It is standby to form.
2. acidproof Nano filtering composite membrane material preparation method according to claim 1, which is characterized in that described after heat treatment
R-S-C-R` the or R-C-O-R` structure of crosslinking is formed after reaction monomers are reacted.
3. acidproof Nano filtering composite membrane material preparation method according to claim 1, which is characterized in that the preparation method includes
Following steps:
(1) cleaning ultrafiltration supports counterdie, removes film surface impurity；
(2) the monomer solution A for preparing certain mass concentration coats the support of ultrafiltration described in step (1) counterdie surface, controls
Coating time 10-600s processed removes residual liquid；
(3) the monomer B solution for preparing certain mass concentration coats the support of ultrafiltration described in step (2) counterdie surface, controls
Coating time 10-600s processed removes residual liquid；
(4) repeating 2-8 step, (process of 2- (3), coating finish, and the ultrafiltration after being coated supports counterdie；
(5) the ultrafiltration support counterdie after being coated step (4) is heat-treated, and 30-100 DEG C of heat treatment temperature, heat treatment
Time 30-900s；
(6) above-mentioned steps (5) composite film material is passed through to the hydrochloric acid solution washing by soaking of 5-10%, wash temperature 25-
80 DEG C, wash time 10-180min；
(7) by treated described in step (6), composite film material is taken out, and after 3% glycerine water solution impregnates 5min, is taken out close
Envelope saves.
4. acidproof Nano filtering composite membrane material preparation method according to claim 3, which is characterized in that step (1) is described super
Filter support counterdie is polymerizable material ultrafiltration membrane, Inorganic Ultrafiltration Membrane, and further preferably, polymerizable material ultrafiltration membrane includes that polysulfones is super
Filter membrane, poly (ether-sulfone) ultrafiltration membrane, polyacrylonitrile ultrafiltration film, polyvinylidene fluoride (PVDF) ultrafiltration membrane, polyethylene ultrafiltration membrane, polypropylene ultrafiltration membrane,
Polyether-ether-ketone ultrafiltration membrane；Further preferably, Inorganic Ultrafiltration Membrane includes that ceramic super-filtering film and the inorganic with acid-resistant property surpass
Filter membrane.
5. acidproof Nano filtering composite membrane material preparation method according to claim 3, which is characterized in that step (1) is described super
Filter support counterdie, form can be flat, hollow fiber form, tubular type, rolled film pattern.
6. acidproof Nano filtering composite membrane material preparation method according to claim 3, which is characterized in that in step (2), monomer
The mass concentration of solution A is 0.1%-3%.
7. acidproof Nano filtering composite membrane material preparation method according to claim 3, which is characterized in that in step (2), monomer
The catalyst of 0.05-0.3g/L is added in solution A, catalyst is sodium carbonate, potassium hydroxide, sodium hydroxide, quaternary ammonium salt one kind
Or several mixture；Further, in step (2), in monomer solution A, monomer A be difunctional or trifunctional alcohol,
Mercaptan, polyphenol；Solvent is the mixture of one or more of water, ethyl alcohol, propyl alcohol, acetone.
8. acidproof Nano filtering composite membrane material preparation method according to claim 3, which is characterized in that in step (3), monomer
The mass concentration of B solution is 0.1-3%；Further, in step (3), monomer B solution, solvent is ethyl alcohol, hexane, isomeric alkane
One or more of hydrocarbon, petroleum ether, toluene, dimethylbenzene mixture；
Further, in step (3), monomer B solution, monomer B is the organic epoxy small molecule of trifunctional, and structural formula is as follows:
Wherein in structural formula, R can be fat hydrocarbon chain structure, aromatic ring structure, aliphatic ring structure, heterocycle structure, further it is excellent
Choosing, monomer B are glycerol tripropoxy triglycidyl ether (CAS:78366-85-5), 1,3,5- three-glycidyl-S- triazines
Triketone (TGIC) (CAS:2451-62-9) or triglycidyl group para-aminophenol (CAS:5026-74-4).
9. acidproof Nano filtering composite membrane material preparation method according to claim 3, which is characterized in that in step (3), monomer
B solution, in order to increase the solubility of monomer, solution process for preparation increases the acetone auxiliary agent of 0.05-5mL/L.
10. acidproof Nano filtering composite membrane material preparation method according to claim 3, which is characterized in that step (2) and (3)
In, the removal residual liquid can use air knife purging, also can use centrifugation and be spin-dried for, can also be blotted by blotting paper
Mode；Further, alternately coating monomer A and the monomer B solution, coating procedure can be centrifugal rotation coating, gas phase
Deposition, atomizing spraying.
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| CN107349804A (en) * | 2017-07-13 | 2017-11-17 | 中国科学院生态环境研究中心 | A kind of preparation method of high flux anti-acid NF membrane |
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