CN106975368A - A kind of continuous method and its equipment for preparing SPSF composite nanometer filtering film - Google Patents
A kind of continuous method and its equipment for preparing SPSF composite nanometer filtering film Download PDFInfo
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- CN106975368A CN106975368A CN201610916376.6A CN201610916376A CN106975368A CN 106975368 A CN106975368 A CN 106975368A CN 201610916376 A CN201610916376 A CN 201610916376A CN 106975368 A CN106975368 A CN 106975368A
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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
- B01D67/00—Processes specially adapted for manufacturing semi-permeable membranes for separation processes or apparatus
- B01D67/0002—Organic membrane manufacture
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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
- B01D67/0009—Organic membrane manufacture by phase separation, sol-gel transition, evaporation or solvent quenching
- B01D67/0011—Casting solutions therefor
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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
- B01D67/0009—Organic membrane manufacture by phase separation, sol-gel transition, evaporation or solvent quenching
- B01D67/0013—Casting processes
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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
- B01D71/30—Polyalkenyl halides
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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
- B01D71/66—Polymers having sulfur in the main chain, with or without nitrogen, oxygen or carbon only
- B01D71/68—Polysulfones; Polyethersulfones
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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
- B01D2323/46—Impregnation
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
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- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The present invention provides a kind of continuous method and its equipment for preparing SPSF composite nanometer filtering film, belongs to technical field of membrane separation.Methods described will prepare micropore basal membrane, basement membrane pretreatment and coating film forming and be reduced to a step process in production technology, specifically include：Coated on backing material under one layer of polymeric casting solution, coagulation bath environment and prepare micropore basal membrane；Micropore basal membrane oven drying after time of infusion in protecting hole agent solution is handled；Dried micropore basal membrane time of infusion in SPSF solution in the way of roll-type immersion coating, film process is carried out into subsequently into baking oven.The equipment, including supporter unreel rotary drum (1), casting film mechanism (2), casting film gel groove (3), basement membrane pretreatment tank (4), the first baking oven (5), SPSF solution dipping tank (6), the second baking oven (7), winding rotary drum (8).The present invention solves the shortcoming that prior art processes step is more and need to implement step by step, it is easy to continuous batch production.
Description
Technical field
The present invention relates to technical field of membrane separation, and in particular to a kind of continuous method for preparing SPSF composite nanometer filtering film
And its equipment.
Background technology
It is conventional as various circles of society increasingly improve and raising of the people to water quality requirement to the attention degree of water environmental problems
The need for handling process can not meet safe drinking water supply.Membrane separation technique is as a kind of high efficient separation technology, due to it
It is not related to phase transformation, non-secondary pollution and the obvious advantage such as is easily operated automatically, water treatment field is widely used in recent years.
Wherein composite nanometer filtering film has very big advantage in fields such as bitter, seawater due to its relatively low pressure and larger flux.
Cladding process is that to use at present is at most also the maximally effective method for preparing composite nanometer filtering film.Cladding process prepares compound
The general step of film is：The first step first prepares micropore basal membrane, and high polymer coating liquid is applied and scrapes or be impregnated into membrane surface by second step
After upper, the 3rd step, which is dried in the shade or heated, makes its solidification crosslinking.Existing cladding process is prepared in composite membrane technology, to reach micropore basal membrane
Energy and clean surface and the technical requirements of drying, need to pre-process micropore basal membrane before second step is carried out.Pretreatment
Hole agent solution is protected including basement membrane immersion, then dries in the shade or dries, it is ensured that membrane surface is clean and dries.In process of production,
One step prepares micropore basal membrane, and second step basement membrane is dried pretreatment, and the 3rd step coats a coating film liquid simultaneously in membrane surface
Carry out into film process.Basement membrane is pre-processed and undoubtedly adds a processing step, production efficiency, or even increase life is reduced
Production is controlled risk.
Invention (CN104524993A) discloses a kind of preparation method of SPSF composite nanometer filtering film, wherein counterdie gel
Pretreatment is dried after shaping by the way of natural air drying 24h, then the ultra-thin cortex of SPSF is coated on counterdie surface,
But this preparation method particularly drying pretreatment method is not suitable for carrying out continuous production.Invent (CN102698609B) public
A kind of semicontinuous device for preparing composite membrane and its composite membrane preparation technology have been opened, the flowing of liquid in control nozzle is laid particular emphasis on
State realizes regioselectivity film, and same be not implemented continuously prepares composite membrane.
The content of the invention
In view of the above-mentioned problems, the present invention provides a kind of continuous method and its equipment for preparing SPSF composite nanometer filtering film,
It is intended to simplify production technology, improves production efficiency, control reduction production risk realizes continuous batch production.
The technical solution adopted by the present invention is specially：
Three steps in production technology are reduced to one by a kind of continuous method and its equipment for preparing SPSF composite nanometer filtering film
Step, that is, prepare micropore basal membrane, basement membrane pretreatment and coating film forming and be reduced to a step process.
A kind of continuous method for preparing SPSF composite nanometer filtering film：
1) preparation of micropore basal membrane：One layer of polymeric casting solution is coated on backing material, is solidified under coagulation bath environment
Shaping.
2) basement membrane dries pretreatment：By step 1) micropore basal membrane of the coagulation forming time of infusion in hole agent solution is protected
Enter the 1st baking oven afterwards and carry out drying and processing, obtain the micropore basal membrane of dried and clean.
3) coat SPSF solution and implement into film process：By step 2) micropore basal membrane of dried and clean impregnates with roll-type
The mode of coating time of infusion in SPSF solution, subsequently into the 2nd baking oven carry out into film process obtain sulfonation gather
Sulfone composite nanometer filtering film.
The material of the non-woven fabrics includes but is not limited to polyethylene terephthalate, polypropylene or polyethylene or it is mixed
Compound；
The nonwoven thickness between 80 μm to 120 μm, weight per unit area in 50g/m2 between 100g/m2, thoroughly
Gas coefficient 0mL/cm2/s is between 50mL/cm2/s.
The micropore basal membrane polymeric casting film liquid is formulated by polymer, solvent, nonsolvent additive, wherein polymer
Mass fraction in the solution is 10-40%, and the mass fraction in the solution of solvent is 35-85%, and nonsolvent additive exists
Mass fraction in solution is 5-25%；
Described polymer includes：It is polyvinyl chloride, polyacrylonitrile, polysulfones, SPSF, polyether sulfone, sulfonated polyether sulfone, poly-
Acid imide, PEI, polyamide or two of which or two or more mixtures；
Described solvent includes：Dimethylformamide, dimethyl acetamide, N, N- dimethyl pyrrolidones, dimethyl are sub-
Sulfone etc. or two of which or two or more mixtures；
Described nonsolvent additive, including：Methanol, ethanol, ethylene glycol, propane diols, glycerine, polyethylene glycol, acetone,
Polyvinylpyrrolidone, lithium chloride, lithium perchlorate etc. or two of which or two or more mixtures；
The coagulation bath composition is deionized water and solvent mixture, and wherein solvent ratios are 0-30%, described solvent
Including：Dimethylformamide, dimethyl acetamide, N, N- dimethyl pyrrolidones, dimethyl sulfoxide (DMSO) etc. or two of which or two
Plant the mixture of the above.
The basement membrane pretreatment is used to be protected hole agent solution composition for deionized water and protects hole agent, wherein it is 0- to protect hole agent ratio
50%, described guarantor hole agent includes：Propane diols, glycerine, polyethylene glycol, calcium chloride, sodium camphorsulfonate etc. or two of which or
Two or more mixtures.
The SPSF solution is formulated by SPSF, nonsolvent additive and solvent, and wherein SPSF exists
Mass fraction in solution is 0-30%, and the mass fraction in the solution of solvent is 50-100%, and nonsolvent additive is molten
Mass fraction in liquid is 0-20%；
The sulfonation degree of the SPSF is between 0-80%%；Further, the solvent includes：Dimethyl formyl
Amine, dimethyl acetamide, N, N- dimethyl pyrrolidones, dimethyl sulfoxide (DMSO), water, ethanol, isopropanol, glycol monoethyl ether, two
Glycol methyl ether, diethylene glycol dimethyl ether, diethylene glycol monoethyl ether, diethylene glycol monobutyl ether, acetone, tetrahydrofuran, dichloromethane etc.
Or two of which or two or more mixtures；
The nonsolvent additive includes：Lithium chloride, lithium perchlorate, ethylene glycol, glycerine, polyethylene glycol, toluene, benzene
Phenol, triethylamine etc. or two of which or two or more mixtures.
A kind of continuous equipment for preparing SPSF composite nanometer filtering film：
Its equipment unreels rotary drum, casting film mechanism, casting film gel groove, basement membrane pretreatment tank, the first baking oven, sulphur including supporter
Change polysulfones solution dipping tank, the second baking oven, winding rotary drum.
The casting film mechanism is arranged on the supporter and unreeled at rotary drum upper outlet, and the casting film gel groove is arranged on institute
State supporter and unreel rotary drum bottom；
Backing material enters after smearing polymeric casting film liquid at the casting film mechanism after unreeling rotary drum transmission through supporter
The casting film gel groove；
Backing material surface is imported into the basement membrane pretreatment tank after forming polymeric layer；
The first baking oven, which is imported into, after the basement membrane pretreatment carries out drying and processing；
Dried basement membrane enters the SPSF solution dipping tank and implements immersion coating；
Basement membrane, which is coated, enters second baking oven implementation drying heat treatment after one layer of SPSF solution；
After drying SPSF composite nanometer filtering film is collected in the winding rotary drum.
The casting film mechanism includes containing the hopper of polymeric casting film liquid and spreads polymeric casting film liquid in supporting body surface
The coating head or scraper of exhibition.
The casting film gel groove includes gel groove, rinse bath and quenching tank.
The beneficial effect comprise that：
A kind of continuous method for preparing SPSF composite nanometer filtering film, simple and easy to apply, production efficiency is high, basement membrane pretreatment work
Skill is dried and clean coating counterdie by the way of drying and processing, and implements basement membrane guarantor hole processing before baking, is kept away
Exempting from drying course causes basement membrane fenestra to shrink and destroy based film structure.The introducing of backing material in prepared by this method micropore basal membrane,
The mechanical strength of composite membrane can be strengthened, keep smooth to bear mechanical tension and high-temperature process in continous way coating process
Degree.
A kind of continuous equipment for preparing SPSF composite nanometer filtering film, prepared by micropore basal membrane, basement membrane is pre-processed and is applied as
The step process of film one, eliminates intermediate link, improves production efficiency, reduces production and controls risk.
Brief description of the drawings
When considered in conjunction with the accompanying drawings, the present invention can more completely be more fully understood.Accompanying drawing described herein is used for providing
A further understanding of the present invention, embodiment and its illustrate be used for explain the present invention, do not constitute inappropriate limitation of the present invention.
Fig. 1 is the continuous Preparation equipment schematic flow sheet of SPSF composite nanometer filtering film of the present invention.Wherein：
1 is that supporter unreels rotary drum, supporter is transmitted into system；
2 be casting film mechanism, to coated polymer casting solution；
3 be casting film gel groove, to gelatin polymer casting solution, and implements cleaning and heat treatment；
4 be basement membrane pretreatment tank, and hole pretreatment is protected to basement membrane；
5 be the first baking oven, to dry pretreatment basement membrane；
6 be SPSF solution dipping tank, to immersion coating SPSF solution；
7 be the second baking oven, dries and is heat-treated to SPSF composite nanometer filtering film；
8 be winding rotary drum, to collect SPSF composite nanometer filtering film.
Embodiment
Below in conjunction with the accompanying drawings and embodiment is described in further detail to technical scheme.
Embodiment 1：
As shown in figure 1, continuous preparation technology：Backing material unreels rotary drum 1 through supporter and is passed to casting film mechanism 2；Branch
Support material surface coating one layer of polymeric casting solution, the coagulation bath formation polymeric layer of immersion casting film gel groove 3, and it is cleaned and
Quenching Treatment obtains micropore basal membrane；Subsequent micropore basal membrane is imported into basement membrane pretreatment tank 4 and implements basement membrane guarantor hole pretreatment；Afterwards by
The drying of first baking oven 5, which is formed, to be dried and clean basement membrane；Dried basement membrane is subsequently conveyed to SPSF solution dipping tank
6, coat one layer of SPSF solution drying membrane surface；Subsequently enter the second baking oven 7 and implement drying heat treatment, in basement membrane table
Face forms one layer of fine and close SPSF composite bed；SPSF composite nanometer filtering film is finally collected by winding rotary drum 8.
The backing material is polyethylene terephthalate non-woven fabrics, and thickness is 95 μm, and weight per unit area is
74g/m2, air transmission coefficient is 2.1mL/cm2/s.The micropore basal membrane polymeric casting film liquid composition is 22.5% polysulfones, 5% poly- second
Alkene pyrrolidone, 72.5% dimethylformamide.The coagulation bath composition is 10% dimethylformamide and 90% ionized water.Institute
It is 30% glycerine and 70% deionized water to state basement membrane pretreatment hole agent solution composition used of protecting.The SPSF solution by
5% SPSF (sulfonation degree 40%), 8% ethylene glycol and 87% glycol monoethyl ether are formulated.
Pressure is 0.41MPa, and feed temperature is 25 DEG C, and the pure water flux of the SPSF composite nanometer filtering film is 87LMH,
Sodium sulphate rejection to 250mg/L is 87.1%, and the sodium chloride rejection to 250mg/L is 42.9%, to PEG1000 (phases
For rejection 1000) it is 94.5% to molecular weight.
Embodiment 2：
The continuous preparation technology be the same as Example 1 of SPSF composite nanometer filtering film.
The backing material is polyethylene terephthalate and polyethylene blend non-woven fabrics, and thickness is 85 μm, unit
Area weight is 58g/m2, and air transmission coefficient is 4.7mL/cm2/s.The micropore basal membrane polymeric casting film liquid composition gathers for 24.5%
Ether sulfone, 10% Macrogol 6000,65.5% dimethyl acetamide.Coagulation bath composition for 16% dimethyl acetamide and
84% ionized water.Basement membrane pretreatment hole agent solution composition used of protecting is 25% propane diols and 75% deionized water.The sulphur
Change polysulfones solution to be formulated by 8% SPSF (sulfonation degree 60%), 15% glycerine and 79% diethylene glycol dimethyl ether.
Pressure is 0.41MPa, and feed temperature is 25 DEG C, and the pure water flux of the SPSF composite nanometer filtering film is
102LMH, the sodium sulphate rejection to 250mg/L is 82.1%, and the sodium chloride rejection to 250mg/L is 36.9%, right
PEG2000 (relative molecular weight is 2000) rejection is 91.2%.
Embodiment 3：
The continuous preparation technology be the same as Example 1 of SPSF composite nanometer filtering film.
The backing material is polypropylene non-woven fabric, and thickness is 120 μm, and weight per unit area is 80g/m2, air transmission coefficient
For 13.3mL/cm2/s.Micropore basal membrane polymeric casting film liquid composition is 22% polyvinyl chloride, 4% polyvinylpyrrolidone,
6% polyethylene glycol 2000,68%N, N- dimethyl pyrrolidones.The coagulation bath composition is ionized water.The basement membrane pretreatment
Guarantor hole used agent solution composition is 15% propane diols, 3% camphorsulfonic acid and 72% deionized water.The SPSF solution by
15% SPSF (sulfonation degree 25%), 1% lithium chloride and 84% tetrahydrofuran are formulated.
Pressure is 0.41MPa, and feed temperature is 25 DEG C, and the pure water flux of the SPSF composite nanometer filtering film is 64LMH,
Sodium sulphate rejection to 250mg/L is 89.7%, and the sodium chloride rejection to 250mg/L is 50.3%, to PEG1000 (phases
For rejection 1000) it is 96.9% to molecular weight.
Embodiment 4：
The continuous preparation technology be the same as Example 1 of SPSF composite nanometer filtering film.
The backing material is polyethylene terephthalate non-woven fabrics, and thickness is 100 μm, and weight per unit area is
85g/m2, air transmission coefficient is 3.3mL/cm2/s.The micropore basal membrane polymeric casting film liquid composition is 20% polysulfones, and 8% sulfonation gathers
Ether sulfone, 4% polyvinylpyrrolidone, 68% dimethylformamide.Coagulation bath composition for 25% dimethylformamide and
75% ionized water.Basement membrane pretreatment hole agent solution composition used of protecting is 25% glycerine and 75% deionized water.The sulphur
Change polysulfones solution to be formulated by 6% SPSF (sulfonation degree 40%), 20% glycerine and 74% glycol monoethyl ether.
Pressure is 0.41MPa, and feed temperature is 25 DEG C, and the pure water flux of the SPSF composite nanometer filtering film is 57LMH,
Sodium sulphate rejection to 250mg/L is 92.5%, and the sodium chloride rejection to 250mg/L is 58.8%, (relative to PEG600
Molecular weight is that rejection 600) is 87.4%.
Finally it should be noted that：Obviously, above-described embodiment is only intended to clearly illustrate the application example, and simultaneously
The non-restriction to embodiment.For those of ordinary skill in the field, it can also do on the basis of the above description
Go out other various forms of changes or variation.There is no necessity and possibility to exhaust all the enbodiments.And thus drawn
Among the obvious changes or variations that Shen goes out is still in the protection domain of the application type.
Claims (9)
1. a kind of continuous method for preparing SPSF composite nanometer filtering film, it is characterised in that methods described is specifically included：
1) preparation of micropore basal membrane：One layer of polymeric casting solution, the coagulation forming under coagulation bath environment are coated on backing material.
2) basement membrane dries pretreatment：By step 1) micropore basal membrane of the coagulation forming time of infusion in hole agent solution is protected is laggard
Enter baking oven and carry out drying and processing, obtain the micropore basal membrane of dried and clean.
3) coat SPSF solution and implement into film process：By step 2) micropore basal membrane of dried and clean is with roll-type immersion coating
Mode in SPSF solution time of infusion, carry out into film process subsequently into baking oven and obtain that SPSF is compound to be received
Filter membrane.
2. a kind of continuous method for preparing SPSF composite nanometer filtering film according to claim 1, it is characterised in that described
Backing material has the characteristics that：
The backing material is non-woven fabrics, and the material of the non-woven fabrics includes but is not limited to polyethylene terephthalate, gathered
Propylene or polyethylene or its mixture；
The nonwoven thickness is between 80 μm to 120 μm, and weight per unit area is in 50g/m2 to 100g/m2Between, air transmission coefficient
0mL/cm2/s is between 50mL/cm2/s.
3. a kind of continuous method for preparing SPSF composite nanometer filtering film according to claim 1, it is characterised in that described
Polymeric casting film liquid is made up of following components：
The polymeric casting film liquid is formulated by polymer, solvent, nonsolvent additive, and the mass fraction of wherein polymer is
10-40%, the mass fraction of solvent is 35-85%, and the mass fraction of nonsolvent additive is 5-25%；
The polymer includes：Polyvinyl chloride, polyacrylonitrile, polysulfones, SPSF, polyether sulfone, sulfonated polyether sulfone, polyamides are sub-
Amine, PEI, polyamide or two of which or two or more mixtures；
The solvent includes：Dimethylformamide, dimethyl acetamide, N, N- dimethyl pyrrolidones, dimethyl sulfoxide (DMSO) etc. or
Two of which or two or more mixtures；
The nonsolvent additive includes：Methanol, ethanol, ethylene glycol, propane diols, glycerine, polyethylene glycol, acetone, polyethylene
Pyrrolidones, lithium chloride, lithium perchlorate etc. or two of which or two or more mixtures.
4. a kind of continuous method for preparing SPSF composite nanometer filtering film according to claim 1, it is characterised in that described
Coagulation bath composition is deionized water and solvent mixture, and wherein solvent ratios are 0-30%, and described solvent includes：Dimethyl methyl
Acid amides, dimethyl acetamide, N, N- dimethyl pyrrolidones, dimethyl sulfoxide (DMSO) etc. or two of which or two or more mixing
Thing.
5. a kind of continuous method for preparing SPSF composite nanometer filtering film according to claim 1, it is characterised in that described
Basement membrane pretreatment is used to be protected hole agent solution composition for deionized water and protects hole agent, wherein it is 0-50% to protect hole agent ratio, it is described
Protecting hole agent includes：Propane diols, glycerine, polyethylene glycol, calcium chloride, sodium camphorsulfonate etc. or two of which are two or more mixed
Compound.
6. a kind of continuous method for preparing SPSF composite nanometer filtering film according to claim 1, it is characterised in that described
SPSF solution is made up of following components:
The SPSF solution is formulated by SPSF, nonsolvent additive and solvent, and wherein SPSF is in solution
In mass fraction be 0-30%, the mass fraction in the solution of solvent is 50-100%, and nonsolvent additive is in the solution
Mass fraction be 0-20%；
The sulfonation degree of the SPSF is between 0-80%；
The solvent includes：Dimethylformamide, dimethyl acetamide, N, N- dimethyl pyrrolidones, dimethyl sulfoxide (DMSO), water,
Ethanol, isopropanol, glycol monoethyl ether, diethylene glycol methyl ether, diethylene glycol dimethyl ether, diethylene glycol monoethyl ether, diethylene glycol mono butyl
Ether, acetone, tetrahydrofuran, dichloromethane etc. or two of which or two or more mixtures；
The nonsolvent additive includes：Lithium chloride, lithium perchlorate, ethylene glycol, glycerine, polyethylene glycol, toluene, phenol, three
Ethamine etc. or two of which or two or more mixtures.
7. a kind of continuous equipment for preparing SPSF composite nanometer filtering film, it is characterised in that the equipment is unreeled including supporter
Rotary drum (1), casting film mechanism (2), casting film gel groove (3), basement membrane pretreatment tank (4), the first baking oven (5), the leaching of SPSF solution
Stain groove (6), the second baking oven (7), winding rotary drum (8).The casting film mechanism (2) is arranged on the supporter and unreeled on rotary drum (1)
Portion exit, the casting film gel groove (3) is arranged on the supporter and unreels rotary drum (1) bottom；Backing material is put through supporter
Roll up and enter the casting film gel groove (3) after smearing polymeric casting film liquid at casting film mechanism (2) place after rotary drum (1) transmission；Branch
The basement membrane pretreatment tank (4) is imported into after support material surface formation polymeric layer；First is imported into after the basement membrane pretreatment
Baking oven (5) carries out drying and processing；Dried basement membrane enters the SPSF solution dipping tank (6) and implements immersion coating；Base
Film, which is coated, enters second baking oven (7) implementation drying heat treatment after one layer of SPSF solution；Turn after drying in the winding
Drum (8) collects SPSF composite nanometer filtering film.
8. a kind of continuous equipment for preparing SPSF composite nanometer filtering film according to claim 7, it is characterised in that described
Casting film mechanism (2) includes the coating head for containing the hopper of polymeric casting film liquid and sprawling polymeric casting film liquid in supporting body surface
Or scraper.
9. a kind of continuous equipment for preparing SPSF composite nanometer filtering film according to claim 7, it is characterised in that described
Casting film gel groove (3) includes gel groove, rinse bath and quenching tank.
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| CN113680210A (en) * | 2021-08-17 | 2021-11-23 | 安徽智泓净化科技股份有限公司 | Nanofiltration membrane for separating low-valence ions and preparation method thereof |
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