CN112295405A - High-flux high-pollution-resistance polyethylene ultrafiltration membrane and preparation method thereof - Google Patents
High-flux high-pollution-resistance polyethylene ultrafiltration membrane and preparation method thereof Download PDFInfo
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Abstract
The invention relates to a high-flux high-pollution-resistance polyethylene ultrafiltration membrane, which is characterized in that nano-scale carbon nano tubes are arrayed to have a channel effect in directional arrangement, then the nano-scale carbon nano tubes are used as an additive to prepare the polyethylene ultrafiltration membrane, the polyethylene ultrafiltration membrane is treated by a hydrophilic reagent to enable the membrane to have the hydrophilic performance and the water channel effect at the same time, and the electrical performance of the carbon nano tubes can effectively improve the separation capacity of the membrane.
Description
Technical Field
The invention relates to the technical field of ultrafiltration membranes, in particular to a preparation method of a polyethylene ultrafiltration membrane with high flux and high pollution resistance and application of the ultrafiltration membrane.
Background
Membrane separation technology is receiving attention from a wide range of scientists because of its many advantages in industrial processes. The membrane separation process mainly comprises Membrane Distillation (MD), Ultrafiltration (UF), Reverse Osmosis (RO), Microfiltration (MF) and Nanofiltration (NF). The membrane separation technology has the main advantages of easy process amplification, simple operation, high separation efficiency, low energy consumption and no harmful additive. Wherein the ultrafiltration membraneThe pore diameter is 10-100 nanometers, and the molecular weight cut-off is 500-106Because of the advantages of simple operation, low energy consumption, operability at room temperature and the like, the membrane separation technology is widely applied to the industries of water treatment, food industry, environmental protection, gas purification and the like.
Polyethylene (PE), which is one of the most widely used resin materials at present, has the advantages of high corrosion resistance, good stability, excellent machine type performance, excellent physical and chemical properties, etc., but because polyethylene has extremely strong hydrophobicity due to its own C — H bond and has extremely poor wettability, the flux and contamination resistance of the prepared ultrafiltration membrane are reduced, so that it is very important to perform hydrophilization modification on polyethylene to make polyethylene have hydrophilic performance.
The commonly used ultrafiltration membrane is mainly prepared by a non-solvent induced phase separation method (NIPS) and a thermally induced phase separation method (TIPS), PE is used as a crystalline polymer, no good solvent is basically used for dissolving the PE at normal temperature, the TIPS is used as the method for preparing the ultrafiltration membrane which is most widely used at present, and the ultrafiltration membrane has the advantages of good pore-forming effect and controllable pore structure, and the connectivity of the pore structure can be effectively controlled by selecting a diluent and an extracting agent, which is the most important point in a water treatment membrane.
Disclosure of Invention
The invention aims to overcome the defects of the existing membrane preparation technology and provides a high-flux and high-pollution-resistance ultrafiltration membrane with the function of loading an arrayed carbon nanotube water channel and a preparation method thereof. The invention utilizes various nano-scale carbon nano-tubes and carries out array treatment on the surfaces of the nano-scale carbon nano-tubes to enable the nano-scale carbon nano-tubes to have the function of water channels, the nano-scale carbon nano-tubes are used as additives to prepare a polyethylene base membrane, and a large number of hydrophilic groups are generated on the surface of the base membrane in a hydrophilic reagent loading mode, so that the membrane has the functions of hydrophilicity and water channels.
A preparation method of a high-flux and high-pollution resistance polyethylene ultrafiltration membrane comprises the following specific steps:
(1) placing the carbon nano tube in a mixed solution of nitric acid and sulfuric acid, performing ultrasonic treatment for 0-8 h at 40-100 ℃, mechanically stirring for 0-8 h, and performing high-speed centrifugal purification and filtration to obtain a treated carbon nano tube;
the carbon nano tube is one of a single-wall carbon nano tube, a double-wall carbon nano tube and a multi-wall carbon nano tube;
the volume ratio of nitric acid to sulfuric acid in the mixed solution of nitric acid and sulfuric acid is 1:0, 1:1, 1:3, 3:1 and 0: 1.
(2) Adding the treated carbon nano tube prepared in the step (1) into a diluent, and carrying out probe ultrasonic treatment for 2 hours to uniformly mix the carbon nano tube and the diluent; then, continuously adding polyethylene and an additive, and heating and stirring for 1-5 hours at 170-220 ℃ in a vacuum state to obtain a casting solution;
the mass fraction of the treated carbon nano tube in the membrane casting solution is 0.5-5%;
the mass fraction of the polyethylene in the membrane casting solution is 10-40%;
the mass fraction of the additive in the casting solution is 0.01-1%;
the mass fraction of the diluent in the casting solution is 60-90%;
the mass fractions of the carbon nano tube, the diluent, the polyethylene and the additive ensure that the sum of the four is 100 percent.
The molecular weight of the polyethylene is between 100 and 2000 ten thousand;
the diluent is one or more of mineral oil, diphenyl ether, Liquid Paraffin (LP), soybean oil, diisodecyl phthalate (DIDP) and white oil;
the additive is pore-foaming agent and surfactant;
wherein the pore-forming agent is one of polyethylene glycol, hydroxypropyl cellulose, polyurethane, urea, polyvinylpyrrolidone and talcum powder,
the surfactant is one of sodium dodecyl sulfonate, cetyl trimethyl ammonium bromide, dodecyl trimethyl ammonium bromide, tween-85, sodium polystyrene sulfonate and methyl cellulose.
(3) Placing the casting solution prepared in the step (2) in a glass mold, placing the mold in a hot air oven at 170-220 ℃ to obtain a dry polyethylene film, directly applying an electric field with 220-500V alternating pulse voltage to the glass mold containing polyethylene/carbon nanotube solution, and obtaining an arrayed carbon nanotube/polyethylene composite film under the action of the electric field;
the time of the electric field action is 1-5 h;
(4) placing the polyethylene film obtained in the step (3) in an extracting agent to completely extract the diluent to obtain a polyethylene base film; the extraction time is 5-10 h;
the extracting agent is one of cyclohexane, n-heptane, toluene, n-hexane, n-pentane, absolute ethyl alcohol, dichloromethane and decalin;
(5) drying the polyethylene base film obtained in the step (4), completely immersing the polyethylene base film in a hydrophilic agent, taking out the obtained base film, and thermally sealing the base film for 15 min; the immersion time is 2-20 min, the heat seal temperature is 50-80 ℃, and the heat seal time is 2-20 min;
the hydrophilic agent is polyvinyl alcohol, a cross-linking agent and a solvent; the mass fraction of the polyvinyl alcohol in the hydrophilic agent is 0.5-5%, and the mass fraction of the cross-linking agent in the hydrophilic agent is 0-10%.
Wherein the alcoholysis degree of the polyvinyl alcohol is 60.0-99.8 mol%, the molecular weight is 50000-180000,
the cross-linking agent is one of glyoxal, glutaraldehyde, TMPTA, Pentaerythritol (PER), maleic anhydride, Trimethylolpropane (TMP) and polyether polyol (N220);
the solvent is one of dimethyl sulfoxide (DMSO), N-dimethylacetamide (DMAc) and water.
(6) And (4) washing the heat-sealed basement membrane obtained in the step (5) by using pure water and then storing to obtain the high-flux and high-pollution-resistance polyethylene ultrafiltration membrane.
Compared with the prior art, the invention has the beneficial effects that:
(1) the carbon nano tube with the water channel effect is obtained by utilizing the electric field to array the carbon nano tube, the carbon nano tube is added into the hydrophobic polyethylene film to prepare the arrayed carbon nano tube/polyethylene ultrafiltration film, the hydrophilic reagent is coated on the surface of the base film to enable the base film to have hydrophilic performance, and the electrical performance and the mechanical strength of the polyethylene ultrafiltration film can be obviously improved by utilizing the nano effect and the carbon enhancement effect of the carbon nano tube.
(2) The polyethylene film selected by the application has excellent physicochemical properties and stability compared with other polymer film materials.
(3) The arrayed carbon nanotube/polyethylene ultrafiltration membrane prepared by the method has the advantages of high water flux, good wettability, low contact angle, high flux recovery rate and high retention rate to BSA.
Detailed Description
The following provides a specific embodiment of the high-flux and high-pollution-resistance polyethylene ultrafiltration membrane of the present invention.
Example 1
Adding the multi-walled carbon nano-tube into a mixed solution of nitric acid and sulfuric acid (1:3) in a volume ratio, carrying out ultrasonic reaction for 6 hours at 60 ℃, continuously stirring the mixture in an oil bath pot for reaction for 6 hours, and carrying out high-speed centrifugal purification and filtration to obtain the carbon nano-tube with the required length and length-diameter ratio.
Drying polyethylene (Mn 5X 10)6) Respectively adding 4 mass percent of multi-wall carbon nano tube, 75 mass percent of thinner white oil and 1 mass percent of polyethylene glycol into 20 mass percent of polyethylene, heating to 180 ℃, stirring for 4 hours under a vacuum state to obtain a casting solution, placing the prepared casting solution into a glass mold, placing the mold into a hot air oven at 180 ℃ to obtain a dried polyethylene film, directly applying an electric field with 380V alternating pulse voltage to the glass mold containing polyethylene/carbon nano tube solution to obtain an arrayed carbon nano tube/polyethylene composite film under the action of an electric field for 3 hours, and placing the obtained base film into an extracting agent dichloromethane to completely extract the thinner to obtain the required base film.
And (2) completely immersing the obtained polyethylene base membrane after drying in a 4% PVA solution, taking 5% glutaraldehyde as a cross-linking agent, taking out the polyethylene base membrane after immersing for 10min, carrying out heat-seal cross-linking for 15min at 70 ℃, washing the heat-sealed base membrane with pure water, and storing to obtain the high-flux and high-pollution-resistance polyethylene ultrafiltration membrane 1 prepared by the invention, wherein the performance test result of the embodiment 1 is shown in Table 1.
Example 2
The high-flux and high-pollution-resistance polyethylene ultrafiltration membrane 2 prepared by the invention is obtained by changing 380V alternating pulse voltage to 220V without changing other steps in the example 1, and the performance test result of the example 2 is shown in Table 1.
Example 3
The high-flux and high-pollution-resistance polyethylene ultrafiltration membrane 3 prepared by the invention is obtained by changing 380V alternating pulse voltage to 500V without changing other steps in the example 1, and the performance test result of the example 3 is shown in Table 1.
Example 4
Adding the multi-walled carbon nano-tube into a mixed solution of nitric acid and sulfuric acid (1:1) in a volume ratio, performing ultrasonic reaction for 4 hours at 50 ℃, continuously stirring the mixture in an oil bath pot for reaction for 4 hours, and performing high-speed centrifugal purification and filtration to obtain the carbon nano-tube with the required length and length-diameter ratio.
Drying polyethylene (Mn 5X 10)6) Respectively adding 4 mass percent of multi-wall carbon nano tube, 75 mass percent of thinner white oil and 1 mass percent of polyethylene glycol into 20 mass percent of polyethylene, heating to 180 ℃, stirring for 4 hours under a vacuum state to obtain a casting solution, placing the prepared casting solution into a glass mold, placing the mold into a hot air oven at 180 ℃ to obtain a dried polyethylene film, directly applying an electric field with 380V alternating pulse voltage to the glass mold containing polyethylene/carbon nano tube solution to obtain an arrayed carbon nano tube/polyethylene composite film under the action of an electric field for 3 hours, and placing the obtained base film into an extracting agent dichloromethane to completely extract the thinner to obtain the required base film.
The obtained polyethylene base membrane is dried and then completely immersed in 4% of PVA solution, 5% of glutaraldehyde is used as a cross-linking agent, a solvent is dimethyl sulfoxide (DMSO), the polyethylene base membrane is immersed for 10min and then taken out to be thermally cross-linked at 70 ℃ for 15min, the thermally sealed base membrane is washed by pure water and then stored, and the high-flux and high-pollution-resistance polyethylene ultrafiltration membrane 4 prepared by the method is obtained, and the performance test result of the embodiment 4 is shown in Table 1.
Example 5
The other steps in the above example 4 are not changed, after the ultrasonic reaction at 50 ℃ for 4 hours in the mixed solution of nitric acid and sulfuric acid (1:1) in the volume ratio, the oil bath kettle is continuously stirred for reaction for 4 hours, and after the ultrasonic reaction at 80 ℃ for 8 hours in the mixed solution of nitric acid and sulfuric acid (3:1) in the volume ratio, the oil bath kettle is continuously stirred for reaction for 5 hours to obtain the high-flux and high-pollution-resistance polyethylene ultrafiltration membrane 5 prepared by the invention, and the performance test results of the example 5 are shown in table 1.
Example 6
Adding the multi-walled carbon nano-tube into a mixed solution of nitric acid and sulfuric acid (1:3) in a volume ratio, carrying out ultrasonic reaction for 6 hours at 60 ℃, continuously stirring the mixture in an oil bath pot for reaction for 6 hours, and carrying out high-speed centrifugal purification and filtration to obtain the carbon nano-tube with the required length and length-diameter ratio.
Drying polyethylene (Mn 8 × 10)6) Respectively adding 4 mass percent of multi-wall carbon nano tube, 75 mass percent of thinner white oil and 1 mass percent of polyethylene glycol into 20 mass percent of polyethylene, heating to 180 ℃, stirring for 4 hours under a vacuum state to obtain a casting solution, placing the prepared casting solution into a glass mold, placing the mold into a hot air oven at 180 ℃ to obtain a dried polyethylene film, directly applying an electric field with 380V alternating pulse voltage to the glass mold containing polyethylene/carbon nano tube solution to obtain an arrayed carbon nano tube/polyethylene composite film under the action of an electric field for 3 hours, and placing the obtained base film into an extracting agent dichloromethane to completely extract the thinner to obtain the required base film.
And (2) completely immersing the obtained polyethylene base membrane after drying in a 4% PVA solution, taking 5% glutaraldehyde as a cross-linking agent, taking out the polyethylene base membrane after immersing for 10min, carrying out heat-seal cross-linking for 15min at 70 ℃, washing the heat-sealed base membrane with pure water, and storing to obtain the high-flux and high-pollution-resistance polyethylene ultrafiltration membrane 6 prepared by the invention, wherein the performance test result of the embodiment 6 is shown in Table 1.
Example 7
The other steps in example 6 were not changed, and the molecular weight of the polyethylene was changed to (Mn ═ 6 × 10)7) The high-flux and high-pollution-resistance polyethylene ultrafiltration membrane 7 prepared by the invention is obtained, and the performance test result of the example 7 is shown in table 1.
Example 8
Adding the multi-walled carbon nano-tube into a mixed solution of nitric acid and sulfuric acid (1:3) in a volume ratio, carrying out ultrasonic reaction for 6 hours at 60 ℃, continuously stirring the mixture in an oil bath pot for reaction for 6 hours, and carrying out high-speed centrifugal purification and filtration to obtain the carbon nano-tube with the required length and length-diameter ratio.
Drying polyethylene (Mn 5X 10)6) Respectively adding 1% by mass of multi-wall carbon nano tube, 75% by mass of diluent white oil and 1% by mass of polyethylene glycol into 23% by mass of polyethylene, heating to 180 ℃ and stirring for 4 hours under a vacuum state to obtain a casting solution, placing the prepared casting solution into a glass mold, placing the mold into a hot air oven at 180 ℃ to obtain a dried polyethylene film, directly applying an electric field with 380V alternating pulse voltage to the glass mold containing polyethylene/carbon nano tube solution to obtain an arrayed carbon nano tube/polyethylene composite film under the action of the electric field for 3 hours, and placing the obtained base film into an extracting agent dichloromethane to completely extract the diluent to obtain the required base film.
And (2) completely immersing the obtained polyethylene base membrane after drying in a 4% PVA solution, taking 5% glutaraldehyde as a cross-linking agent, taking out the polyethylene base membrane after immersing for 10min, carrying out heat-seal cross-linking for 15min at 70 ℃, washing the heat-sealed base membrane with pure water, and storing to obtain the high-flux and high-pollution-resistance polyethylene ultrafiltration membrane 8 prepared by the invention, wherein the performance test result of the embodiment 8 is shown in Table 1.
Example 9
All other steps in the above example 8 are not changed, and the multi-walled carbon nanotube with the mass ratio of 1%, the diluent white oil with the mass ratio of 75% and the polyethylene glycol with the mass ratio of 1% are respectively added into the polyethylene with the mass ratio of 23% to obtain the polyethylene ultrafiltration membrane 9 with the high flux and the high pollution resistance prepared by the invention, wherein the multi-walled carbon nanotube with the mass ratio of 5%, the diluent white oil with the mass ratio of 74% and the polyethylene glycol with the mass ratio of 1% are respectively added into the polyethylene with the mass ratio of 20%, and the performance test results of the example 9 are shown in table 1.
Example 10
Adding the multi-walled carbon nano-tube into a mixed solution of nitric acid and sulfuric acid (1:3) in a volume ratio, carrying out ultrasonic reaction for 6 hours at 60 ℃, continuously stirring the mixture in an oil bath pot for reaction for 6 hours, and carrying out high-speed centrifugal purification and filtration to obtain the carbon nano-tube with the required length and length-diameter ratio.
Drying polyethylene (Mn 5X 10)6) Respectively adding 4% of multi-wall carbon nano-tube, 75% of thinner white oil and 1% of polyethylene glycol into 20% by massHeating the polyethylene to 180 ℃, stirring for 4 hours under a vacuum state to obtain a casting solution, placing the prepared casting solution in a glass mold, placing the mold in a hot air oven at 180 ℃ to obtain a dried polyethylene film, directly applying an electric field with 380V alternating pulse voltage to the glass mold containing the polyethylene/carbon nanotube solution to obtain an arrayed carbon nanotube/polyethylene composite film under the action of the electric field for 3 hours, and placing the obtained base film in an extracting agent dichloromethane to completely extract the diluting agent to obtain the required base film.
The obtained polyethylene base membrane is dried and then completely immersed in 1% of PVA solution, 5% of glutaraldehyde is used as a cross-linking agent, a solvent is dimethyl sulfoxide (DMSO), the polyethylene base membrane is immersed for 10min and then taken out to be thermally cross-linked at 70 ℃ for 15min, the thermally sealed base membrane is washed by pure water and then stored, the high-flux and high-pollution-resistance polyethylene ultrafiltration membrane 10 prepared by the invention is obtained, and the performance test result of the embodiment 10 is shown in Table 1.
Example 11
The high-flux and high-pollution-resistance polyethylene ultrafiltration membrane 11 prepared by the invention is obtained by changing the condition that the other steps in the above example 10 are not changed and the condition that the membrane is completely immersed in the 1% PVA solution into the condition that the membrane is completely immersed in the 5% PVA solution, and the performance test results of the example 11 are shown in the table 1.
Comparative example 1
Drying polyethylene (Mn 5X 10)6) Respectively adding 75% by mass of diluent white oil and 1% by mass of polyethylene glycol into 24% by mass of polyethylene, heating to 180 ℃, stirring for 4 hours under a vacuum state to obtain a casting solution, placing the prepared casting solution on a 180 ℃ glass plate for film scraping, and placing the obtained base film in an extractant dichloromethane to completely extract the diluent to obtain the required base film.
And (2) completely immersing the obtained polyethylene base membrane after drying in 4% of PVA solution, taking 5% of glutaraldehyde as a cross-linking agent, taking out the polyethylene base membrane after immersing for 10min, carrying out heat-seal cross-linking for 15min at 70 ℃, washing the heat-sealed base membrane with pure water, and storing to obtain the high-flux and high-pollution-resistance polyethylene ultrafiltration membrane 12 prepared by the invention, wherein the performance test result of the comparative example 1 is shown in Table 1.
Comparative example 2
Adding the multi-walled carbon nano-tube into a mixed solution of nitric acid and sulfuric acid (1:3) in a volume ratio, carrying out ultrasonic reaction for 6 hours at 60 ℃, continuously stirring the mixture in an oil bath pot for reaction for 6 hours, and carrying out high-speed centrifugal purification and filtration to obtain the carbon nano-tube with the required length and length-diameter ratio.
Drying polyethylene (Mn 5X 10)6) Respectively adding 4% by mass of multi-wall carbon nanotubes, 75% by mass of diluent white oil and 1% by mass of polyethylene glycol into 20% by mass of polyethylene, heating to 180 ℃ and stirring for 4 hours in a vacuum state to obtain a casting solution, placing the prepared casting solution into a glass mold, placing the mold into a hot air oven at 180 ℃ to obtain a dried polyethylene film, directly applying an electric field with 380V alternating pulse voltage to the glass mold containing the polyethylene/carbon nanotube solution to obtain an arrayed carbon nanotube/polyethylene composite film under the action of an electric field for 3 hours, placing the obtained base film into an extracting agent dichloromethane, and completely extracting the diluent to obtain the required base film 13, wherein the performance test result of the comparative example 2 is shown in Table 1.
The film performance test and characterization in the examples and comparative examples are carried out according to GB/T32360-2015; the Flux Recovery Ratio (FRR) is generally used to rate the anti-fouling performance of the membrane, and is calculated as follows: wherein JW1And JW2The pure water flux without contaminating the ultrafiltration membrane and the pure water flux after filtering and washing the BSA liquid, respectively.
Table 1. flux, rejection performance and contact angle of the composite ultrafiltration membranes of examples and comparative examples.
As can be seen from table 1: the surface of the nano-scale carbon nanotube is truncated by the oxidation and pickling process and is rich in hydroxyl and carboxyl, the nano-scale carbon nanotube is subjected to directional arrangement after passing through an electric field array, the anti-fouling performance of the membrane is improved, the BSA interception rate is improved, and the flux recovery rate is improved.
Meanwhile, after the hydrophilic reagent is treated, the surface of the membrane is rich in hydrophilic groups, the hydrophilic performance of the membrane is further improved, the pure water flux is further improved, and the contact angle is obviously reduced.
The foregoing is illustrative of the preferred embodiments of the present invention, and it is to be understood that the invention is not limited thereto, and that various modifications and enhancements which fall within the spirit and scope of the invention are possible.
Claims (10)
1. The preparation method of the polyethylene ultrafiltration membrane with high flux and high pollution resistance is characterized by comprising the following specific steps:
(1) placing the carbon nano tube in a mixed solution of nitric acid and sulfuric acid, performing ultrasonic treatment for 0-8 h at 40-100 ℃, mechanically stirring for 0-8 h, and performing high-speed centrifugal purification and filtration to obtain a treated carbon nano tube;
(2) adding the treated carbon nano tube prepared in the step (1) into a diluent, and carrying out probe ultrasonic treatment for 2 hours to uniformly mix the carbon nano tube and the diluent; then, continuously adding polyethylene and an additive, and heating and stirring for 1-5 hours at 170-220 ℃ in a vacuum state to obtain a casting solution;
(3) placing the casting solution prepared in the step (2) in a glass mold, placing the mold in a hot air oven at 170-220 ℃ to obtain a dried polyethylene film, directly applying an electric field with 220-500V alternating pulse voltage to the glass mold containing polyethylene/carbon nanotube solution, and obtaining an arrayed carbon nanotube/polyethylene composite film under the action of the electric field;
(4) placing the polyethylene film obtained in the step (3) in an extracting agent to completely extract the diluent to obtain a polyethylene base film; the extraction time is 5-10 h;
(5) drying the polyethylene base film obtained in the step (4), completely immersing the polyethylene base film in a hydrophilic agent, taking out the obtained base film, and thermally sealing the base film for 15 min; the immersion time is 2-20 min, the heat seal temperature is 50-80 ℃, and the heat seal time is 2-20 min;
(6) and (4) washing the heat-sealed basement membrane obtained in the step (5) by using pure water and then storing to obtain the high-flux and high-pollution-resistance polyethylene ultrafiltration membrane.
2. The method for preparing the polyethylene ultrafiltration membrane with high flux and high contamination resistance according to claim 1, wherein in the step (1), the carbon nanotube is one of a single-walled carbon nanotube, a double-walled carbon nanotube and a multi-walled carbon nanotube.
3. The method for preparing the polyethylene ultrafiltration membrane with high flux and high contamination resistance according to claim 1, wherein, in the step (2),
the mass fraction of the treated carbon nano tube in the membrane casting solution is 0.5-5%;
the mass fraction of the polyethylene in the membrane casting solution is 10-40%;
the mass fraction of the additive in the casting solution is 0.01-1%;
the mass fraction of the diluent in the casting solution is 60-90%.
4. The method for preparing the polyethylene ultrafiltration membrane with high flux and high contamination resistance according to claim 1, wherein, in the step (2),
the molecular weight of the polyethylene is 100-2000 ten thousand.
5. The method for preparing the polyethylene ultrafiltration membrane with high flux and high contamination resistance according to claim 1, wherein, in the step (2),
the diluent is one or more of mineral oil, diphenyl ether, Liquid Paraffin (LP), soybean oil, diisodecyl phthalate (DIDP) and white oil;
the additive is pore-foaming agent and surfactant.
6. The method for preparing the polyethylene ultrafiltration membrane with high flux and high contamination resistance according to claim 1, wherein in the step (2), the pore-forming agent is one of polyethylene glycol, hydroxypropyl cellulose, polyurethane, urea, polyvinylpyrrolidone and talcum powder,
the surfactant is one of sodium dodecyl sulfonate, cetyl trimethyl ammonium bromide, dodecyl trimethyl ammonium bromide, tween-85, sodium polystyrene sulfonate and methyl cellulose.
7. The method for preparing the polyethylene ultrafiltration membrane with high flux and high pollution resistance according to claim 1, wherein in the step (3), the electric field is applied for 1-5 hours.
8. The method for preparing a polyethylene ultrafiltration membrane with high flux and high stain resistance according to claim 1, wherein in the step (4), the extracting agent is one of cyclohexane, n-heptane, toluene, n-hexane, n-pentane, absolute ethyl alcohol, dichloromethane and decalin.
9. The method for preparing a polyethylene ultrafiltration membrane with high flux and high contamination resistance according to claim 1, wherein in the step (5), the hydrophilic agent is polyvinyl alcohol, a crosslinking agent and a solvent; the mass fraction of the polyvinyl alcohol in the hydrophilic agent is 0.5-5%, and the mass fraction of the cross-linking agent in the hydrophilic agent is 0-10%; wherein the alcoholysis degree of the polyvinyl alcohol is 60.0-99.8 mol%, and the molecular weight is 50000-180000.
10. The method for preparing a polyethylene ultrafiltration membrane with high flux and high stain resistance according to claim 1, wherein in the step (5), the cross-linking agent is one of glyoxal, glutaraldehyde, TMPTA, Pentaerythritol (PER), maleic anhydride, Trimethylolpropane (TMP), polyether polyol (N220);
the solvent is one of dimethyl sulfoxide (DMSO), N-dimethylacetamide (DMAc) and water.
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