CN116764457A - Method for preparing three-dimensional crosslinked reticular hydrophilic coating based on polyolefin microporous membrane - Google Patents
Method for preparing three-dimensional crosslinked reticular hydrophilic coating based on polyolefin microporous membrane Download PDFInfo
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- 238000000576 coating method Methods 0.000 title claims abstract description 46
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- 238000000034 method Methods 0.000 title claims abstract description 33
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- RNMDNPCBIKJCQP-UHFFFAOYSA-N 5-nonyl-7-oxabicyclo[4.1.0]hepta-1,3,5-trien-2-ol Chemical compound C(CCCCCCCC)C1=C2C(=C(C=C1)O)O2 RNMDNPCBIKJCQP-UHFFFAOYSA-N 0.000 claims description 2
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- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical compound [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 claims description 2
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims description 2
- 239000003153 chemical reaction reagent Substances 0.000 claims description 2
- MLUCVPSAIODCQM-NSCUHMNNSA-N crotonaldehyde Chemical compound C\C=C\C=O MLUCVPSAIODCQM-NSCUHMNNSA-N 0.000 claims description 2
- MLUCVPSAIODCQM-UHFFFAOYSA-N crotonaldehyde Natural products CC=CC=O MLUCVPSAIODCQM-UHFFFAOYSA-N 0.000 claims description 2
- 235000014113 dietary fatty acids Nutrition 0.000 claims description 2
- GVGUFUZHNYFZLC-UHFFFAOYSA-N dodecyl benzenesulfonate;sodium Chemical compound [Na].CCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 GVGUFUZHNYFZLC-UHFFFAOYSA-N 0.000 claims description 2
- 239000000194 fatty acid Substances 0.000 claims description 2
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- 150000002191 fatty alcohols Chemical class 0.000 claims description 2
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- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 claims description 2
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- LENZDBCJOHFCAS-UHFFFAOYSA-N tris Chemical compound OCC(N)(CO)CO LENZDBCJOHFCAS-UHFFFAOYSA-N 0.000 claims description 2
- 235000011187 glycerol Nutrition 0.000 claims 1
- 238000001728 nano-filtration Methods 0.000 abstract description 12
- 230000004907 flux Effects 0.000 abstract description 10
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- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 description 4
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- 238000012695 Interfacial polymerization Methods 0.000 description 2
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- JKNCOURZONDCGV-UHFFFAOYSA-N 2-(dimethylamino)ethyl 2-methylprop-2-enoate Chemical compound CN(C)CCOC(=O)C(C)=C JKNCOURZONDCGV-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention discloses a method for preparing a three-dimensional crosslinked reticular hydrophilic coating based on a polyolefin microporous membrane, which comprises the steps of rolling a hydrophilic modified solution containing an amphipathic solvent and a hydrophilic polymer on the surface of the polyolefin microporous membrane by using a rubber roll, and preliminarily forming a uniform and compact hydrophilic coating on the surface of the polyolefin microporous membrane; dip-coating the solution containing the cross-linking agent, and curing the hydrophilic coating; and dip-coating the solution containing hydrophilic polymer, on one hand, hydrophilic groups consumed by the previous step of crosslinking reaction can be supplemented, the hydrophilicity of the polyolefin microporous membrane is enhanced, and on the other hand, the solution reacts with the residual crosslinking agent of the primary hydrophilic coating to be cured. Can form a cross-linked reticular hydrophilic coating with a sandwich structure by taking a polyolefin microporous membrane as a base membrane. The hydrophilic polyolefin microporous base membrane prepared by the invention has excellent hydrophilic performance, lasting stability and hydrophilicity, and the nanofiltration/reverse osmosis membrane prepared by the hydrophilic polyolefin microporous base membrane has excellent water flux and good salt rejection rate.
Description
Technical Field
The invention relates to the technical field of polymer separation membranes, in particular to a method for preparing a three-dimensional crosslinked reticular hydrophilic coating based on a polyolefin microporous membrane.
Background
At present, polyolefin raw materials are abundant, low in price, easy to process and form and excellent in comprehensive performance, so that the polyolefin is a high-molecular material with huge yield and very wide application. The polyolefin has small relative density, good chemical resistance and water resistance; good mechanical strength, electrical insulation and the like. The polyolefin can be used for films, pipes, plates, various molded products, wires and cables, etc.
At present, polyolefin microporous membranes are mainly used as base membranes for nanofiltration or reverse osmosis membranes. The performance of the base material is very important for the nanofiltration membrane or the reverse osmosis membrane, and the strength and the stability of the base material determine the service environment and the service life of the membrane. Traditional base materials such as polyethersulfone, polyarylsulfone, cellulose acetate, polyacrylonitrile and the like have poor acid and alkali resistance, oxidation resistance and solvent resistance, and various use conditions are limited.
The polyolefin microporous membrane is used as a base membrane of nanofiltration or reverse osmosis membrane, overcomes the problem of unstable chemical properties of the traditional base material, has good acid resistance, alkali resistance, multiple organic solvents resistance and various salt solutions resistance, and has higher mechanical strength and low price. Polyolefin microporous membranes have many advantages, and at the same time, have a serious problem, which affects the application of polyolefin membranes. Polyolefin generally refers to the general name of thermoplastic resins obtained by independently polymerizing or copolymerizing ethylene, propylene, 1-butene, 1-pentene, 1-hexene, 1-octene, 4-methyl-1-pentene and other alpha-olefins, and the polymer chain has no hydrophilic group and the material has strong hydrophobicity. In water treatment application, the polyolefin microporous membrane has low surface free energy, resists adhesion and hydrophilic wetting of water molecules, so that an aqueous phase solution in interfacial polymerization cannot infiltrate a substrate membrane, the integrity of interfacial polymerization is affected, and in addition, the transmembrane pressure is high and the water flux is low. And because of the lipophilicity of the polyolefin microporous membrane, the polyolefin microporous membrane is easy to be polluted due to the adsorption of organic matters and microorganisms in the application process. Therefore, the hydrophilic modification technology of the polyolefin microporous membrane is a key technology of whether the polyolefin microporous membrane can be successfully applied as a substrate membrane of nanofiltration or reverse osmosis membrane.
Currently, some related schemes for hydrophilic modification of polyolefin films exist, and the general appearance is mainly divided into two main categories, namely, the structure of a polyolefin material is changed before film preparation, and hydrophilic groups are introduced; in addition, after the polyolefin is formed into a film, it is subjected to a physical or chemical post-treatment.
Such as: CN106139937a discloses a macromolecular hydrophilic modified membrane, a preparation method and application thereof, wherein a macromolecular matrix and a comonomer (dimethylaminoethyl methacrylate, hydroxyethyl acrylate, methacrylamide and acrylamide) are adopted for crosslinking to form an amphiphilic ionizable post-crosslinking hydrophilic copolymer. The method belongs to the field of changing the molecular structure of polyolefin materials so as to achieve the aim of hydrophilic modification. Because common polyolefin materials such as polyethylene, polypropylene, polyvinylidene fluoride and the like have no active chemical sites, the success probability is very low by adopting a modification method of crosslinking with comonomer.
Such as: CN104998562a discloses a hydrophilic modification method of polytetrafluoroethylene film, in which the polytetrafluoroethylene film is subjected to plasma treatment under nitrogen atmosphere, and then is immersed in acrylic acid solution for a period of time, so as to obtain polytetrafluoroethylene film with polyacrylic acid grafted on the surface. The surface physical and chemical treatment methods such as ultraviolet grafting, irradiation grafting, plasma surface grafting and the like are adopted, and the problems of complicated operation steps, complex instruments and equipment, high cost, unstable modification effect and the like exist.
Such as: CN113499692a discloses a hydrophilic improvement method of PP film, which is mainly divided into three steps, namely soaking organic solvent, soaking water-soluble high polymer after water cleaning, and soaking cross-linking agent solution. Experiments prove that the water-soluble polymer in the test method cannot uniformly infiltrate the PP film, so that a polyolefin film with good hydrophilicity cannot be obtained, and further the polyolefin film cannot be used for nanofiltration or a substrate film of a reverse osmosis membrane.
Disclosure of Invention
Therefore, the invention provides a method for preparing a three-dimensional crosslinked reticular hydrophilic coating based on a polyolefin microporous membrane, which solves the problems that the traditional polyolefin microporous membrane is poor in hydrophilicity and the hydrophilicity of the membrane is not durable after hydrophilic modification.
In order to achieve the above object, the present invention provides the following technical solutions: a method for preparing a three-dimensional crosslinked reticulated hydrophilic coating based on a polyolefin microporous membrane, comprising the steps of:
(1) Coating a solution A containing hydrophilic polymers on the surface of a polyolefin microporous membrane serving as a base membrane, adopting a rubber roller to roll the solution A, immersing the polyolefin microporous membrane in the solution A for 5-10 min, and then adopting the rubber roller or an air knife to remove the excessive solution A on the membrane surface of the polyolefin microporous membrane to obtain the initial hydrophilic polyolefin microporous base membrane;
(2) Firstly placing the hydrophilic polyolefin microporous base membrane in an oven at 40-100 ℃ to be dried, then soaking pure water for 2-5 min, and removing superfluous water on the membrane surface of the hydrophilic polyolefin microporous base membrane by adopting a rubber roller or an air knife;
(3) Dipping the hydrophilic polyolefin microporous base film soaked with pure water in a solution B containing a cross-linking agent for 2-5 min, and removing the redundant solution B on the surface of the hydrophilic polyolefin microporous base film by using a rubber roller or an air knife;
(4) Standing the hydrophilic polyolefin microporous base film which is dip-coated with the solution B at room temperature for 5-15 min, and airing to be semi-dry;
(5) Dipping the hydrophilic polyolefin microporous base film which is kept still at room temperature in a solution C containing hydrophilic polymers, dipping the hydrophilic polyolefin microporous base film for 2-5 min, and removing the redundant solution C on the film surface of the hydrophilic polyolefin microporous base film by adopting a rubber roller or an air knife;
(6) And (3) putting the hydrophilic polyolefin microporous base film immersed in the solution C into an oven at 40-80 ℃ for 5-20 min, and taking out for standby.
As a preferred scheme of the method for preparing the three-dimensional crosslinked reticular hydrophilic coating based on the polyolefin microporous membrane, the material of the polyolefin microporous membrane is selected from one of polyethylene, polypropylene, polyvinyl chloride, polybutene, polydicyclopentadiene, polytetrafluoroethylene and polyvinylidene fluoride;
the porosity of the polyolefin microporous membrane is between 30 and 60 percent;
the average pore diameter of the polyolefin microporous membrane is between 0.02 and 0.4 micron;
the polyolefin microporous membrane has an average thickness of between 20 and 120 microns.
As a preferred embodiment of the method for preparing a three-dimensional crosslinked network hydrophilic coating based on a polyolefin microporous membrane, the hydrophilic polymer solution a dip-coated on the surface of the polyolefin microporous membrane comprises: amphiphilic solvent, hydrophilic polymer, surfactant and pure water.
As a preferred scheme of the method for preparing the three-dimensional crosslinked reticular hydrophilic coating based on the polyolefin microporous membrane, the amphiphilic solvent is at least one of methanol, ethanol, isopropanol and acetone;
the mass ratio of the amphiphilic solvent in the solution A is 5-50wt%.
As a preferable scheme of the method for preparing the three-dimensional crosslinked reticular hydrophilic coating based on the polyolefin microporous membrane, the hydrophilic polymer is at least one of chitin, chitosan, cellulose, polyvinyl alcohol, polyethylene glycol, polyvinylpyrrolidone, polyacrylic acid and polyacrylamide;
the hydrophilic polymer mass in the solution A accounts for 0.5-5 wt%.
As a preferred scheme of the method for preparing the three-dimensional crosslinked reticular hydrophilic coating based on the polyolefin microporous membrane, the surfactant is at least one of sodium dodecyl benzene sulfonate, sodium dodecyl sulfate, sodium polystyrene sulfonate, glycerol, polyethylene glycol, polyoxyethylene nonylphenol ether, polysorbate, polyoxyethylene fatty acid ester and polyoxyethylene fatty alcohol ether;
the mass ratio of the surfactant in the solution A is 0.1-0.5 wt%.
As a preferred embodiment of the method for preparing a three-dimensional crosslinked network-like hydrophilic coating based on a polyolefin microporous membrane, the solution B in which the hydrophilic polyolefin microporous base membrane is dip-coated comprises: a crosslinking agent, a crosslinking reaction catalyst and pure water.
As a preferred scheme of the method for preparing the three-dimensional crosslinked reticular hydrophilic coating based on the polyolefin microporous membrane, the crosslinking agent is at least one of glyoxal, glutaraldehyde, paratolualdehyde, crotonaldehyde, oxalic acid, malonic acid, citric acid, maleic anhydride, glycidyl methacrylate and tris (hydroxymethyl) aminomethane;
the mass ratio of the cross-linking agent in the solution B is 0.05-0.5 wt%.
As a preferred scheme of the method for preparing the three-dimensional crosslinked reticular hydrophilic coating based on the polyolefin microporous membrane, the crosslinking reaction catalyst is at least one of sulfuric acid, hydrochloric acid, phosphoric acid and other acid reagents;
the mass ratio of the crosslinking reaction catalyst in the solution B is 0.01-0.5 wt%.
As a preferred embodiment of the method for preparing a three-dimensional crosslinked network-like hydrophilic coating based on a polyolefin microporous membrane, the solution C in which the hydrophilic polyolefin microporous base membrane is dip-coated comprises: hydrophilic polymer and pure water;
the hydrophilic polymer is at least one of chitin, chitosan, cellulose, polyvinyl alcohol, polyethylene glycol, polyvinylpyrrolidone, polyacrylic acid and polyacrylamide;
the hydrophilic polymer mass in the solution C accounts for 0.5-5 wt%.
The beneficial effects of the invention are as follows: coating a solution A containing hydrophilic polymers on the surface of a polyolefin microporous membrane by taking the polyolefin microporous membrane as a base membrane, adopting a rubber roller to roll the solution A, immersing the polyolefin microporous membrane in the solution A for 5-10 min, and then adopting the rubber roller or an air knife to remove redundant solution A on the membrane surface of the polyolefin microporous membrane to obtain the hydrophilic polyolefin microporous base membrane; firstly placing the hydrophilic polyolefin microporous base membrane in an oven at 40-100 ℃ to be dried, then soaking pure water for 2-5 min, and removing excessive water on the membrane surface of the hydrophilic polyolefin microporous base membrane by adopting a rubber roller or an air knife; dipping the hydrophilic polyolefin microporous base film soaked with pure water in a solution B containing a cross-linking agent for 2-5 min, and removing redundant solution B on the surface of the hydrophilic polyolefin microporous base film by using a rubber roller or an air knife; standing the hydrophilic polyolefin microporous base film dip-coated with the solution B at room temperature for 5-15 min, and airing to be semi-dry; dipping the hydrophilic polyolefin microporous base film which is kept stand at room temperature in a solution C containing hydrophilic polymers, dipping the hydrophilic polyolefin microporous base film for 2-5 min, and removing the redundant solution C on the film surface of the hydrophilic polyolefin microporous base film by adopting a rubber roller or an air knife; and (3) putting the hydrophilic polyolefin microporous base film immersed in the solution C into a baking oven at 40-80 ℃ for 5-20 min, and taking out for standby. The hydrophilic polyolefin microporous base membrane prepared by the invention has the advantages of excellent hydrophilic performance, lasting stability, hydrophilicity, simple process, low cost, easy industrial continuous production and the like; the nanofiltration/reverse osmosis membrane prepared by the hydrophilic polyolefin microporous base membrane has excellent water flux and good salt rejection rate.
Detailed Description
Other advantages and advantages of the present invention will become apparent to those skilled in the art from the following detailed description, which, by way of illustration, is to be read in connection with certain specific embodiments, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The following specifically describes a method for preparing a crosslinked mesh-shaped hydrophilic coating layer based on a polyolefin microporous membrane according to an embodiment of the present invention;
(1) Dissolving 5-50wt% of amphiphilic solvent, 0.5-5wt% of hydrophilic polymer and 0.1-0.5wt% of surfactant in pure water to prepare solution A;
(2) Dissolving 0.05 to 0.5 weight percent of cross-linking agent and 0.01 to 0.5 weight percent of cross-linking reaction catalyst in pure water to prepare solution B;
(3) Dissolving 0.5-5 wt% of hydrophilic polymer in pure water to prepare solution C;
(4) Coating a solution A containing hydrophilic polymers on the surface of a polyolefin microporous membrane serving as a base membrane, adopting a rubber roller to roll the solution A, immersing the polyolefin microporous membrane in the solution A for 5-10 min, and then adopting the rubber roller or an air knife to remove the excessive solution A on the membrane surface of the polyolefin microporous membrane to obtain the initial hydrophilic polyolefin microporous base membrane;
(5) Firstly placing the hydrophilic polyolefin microporous base membrane in an oven at 40-100 ℃ to be dried, then soaking pure water for 2-5 min, and removing superfluous water on the membrane surface of the hydrophilic polyolefin microporous base membrane by adopting a rubber roller or an air knife;
(6) Dipping the hydrophilic polyolefin microporous base film soaked with pure water in a solution B containing a cross-linking agent for 2-5 min, and removing the redundant solution B on the surface of the hydrophilic polyolefin microporous base film by using a rubber roller or an air knife;
(7) Standing the hydrophilic polyolefin microporous base film which is dip-coated with the solution B at room temperature for 5-15 min, and airing to be semi-dry;
(8) Dipping the hydrophilic polyolefin microporous base film which is kept still at room temperature in a solution C containing hydrophilic polymers, dipping the hydrophilic polyolefin microporous base film for 2-5 min, and removing the redundant solution C on the film surface of the hydrophilic polyolefin microporous base film by adopting a rubber roller or an air knife;
(9) And (3) putting the hydrophilic polyolefin microporous base film immersed in the solution C into an oven at 40-80 ℃ for 5-20 min, and taking out for standby.
Thus, a polyolefin microporous membrane with a three-dimensional crosslinked reticular hydrophilic coating, namely a hydrophilic polyolefin microporous base membrane, can be prepared, and the hydrophilic polyolefin microporous base membrane with the three-dimensional crosslinked reticular hydrophilic coating obtained by the embodiment of the invention comprises the following parts: polyolefin microporous membranes and crosslinked network hydrophilic coatings. Specifically, the crosslinked reticular hydrophilic coating is divided into three layers similar to a sandwich structure, namely a hydrophilic polymer layer, a crosslinked layer and a hydrophilic polymer layer. The hydrophilic polymer and the amphiphilic solvent form uniform and stable hydrophilic solution, and the amphiphilic solvent can fully infiltrate the polyolefin microporous membrane, so that the hydrophilic polymer is uniformly dispersed in the pores and the surface of the polyolefin microporous membrane, and the polyolefin microporous membrane has initial hydrophilicity; then dip-coating the cross-linking agent solution, and carrying out cross-linking reaction with hydrophilic polymers on the polyolefin microporous membrane to further cure the hydrophilic coating; to supplement most of the hydrophilic groups consumed by the crosslinking reaction, the solution containing the hydrophilic polymer is dip-coated again, and the residual crosslinking agent can cure the second layer of hydrophilic polymer. Through two-step crosslinking reaction, a crosslinked reticular hydrophilic coating can be formed on the polyolefin microporous membrane, the inside of the hydrophilic coating is crosslinked and solidified, and is connected with the polyolefin microporous membrane through a riveting structure, and the hydrophilic coating has good hydrophilicity and can be durable, stable and hydrophilic. The method provided by the embodiment of the invention is simple, consumes less time, is convenient for industrial continuous production, and the obtained hydrophilic polyolefin microporous membrane has excellent hydrophilic performance and high water flux, and can be used as a base membrane for preparing nanofiltration or reverse osmosis membranes.
See the following table for specific implementations of embodiments of the present invention:
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in this example, to test the hydrophilic properties of polyolefin microporous membranes, the initial pressure of produced water (bar) and the average water flux (NWP) of the polyolefin microporous membranes were tested using a flat sheet membrane apparatus.
Evaluation of hydrophilic properties of polyolefin microporous membranes with crosslinked reticulated hydrophilic coatings: the membrane is evaluated by cross-flow filtration, 500ppm sodium chloride aqueous solution is used as test solution, the pH value is 7-8, and the initial pressure and water flux of water production of the membrane are tested. To examine the hydrophilic durability of the polyolefin microporous membrane having a crosslinked network-like hydrophilic coating, the membrane was immersed in water at 95℃for a plurality of water changes during which the initial water production pressure and the average water flux of the membrane were re-examined after three months.
Water flux NWP: under certain test conditions, the water yield per unit area of membrane (L/m 2. H) per unit time.
In addition, a hydrophilic polyolefin microporous membrane with a crosslinked reticular hydrophilic coating is used as a base membrane to prepare the nanofiltration membrane. Nanofiltration membrane performance evaluation prepared by taking polyolefin microporous membrane with crosslinked reticular hydrophilic coating as base membrane: the membrane is evaluated by cross-flow filtration, 2000ppm magnesium sulfate solution is used as test solution, and the water flux and the rejection rate of salt of the membrane are tested under the pressure of 7-8 pH value and 1.0 MPa.
Salt rejection rate R: under certain test conditions, the salt concentration (C f ) And salt concentration in produced water (C) p ) Dividing the difference by the concentration of the salt in the water
The result of multiple tests shows that the nanofiltration membrane prepared by taking the hydrophilic polyolefin microporous membrane with the crosslinked reticular hydrophilic coating as the base membrane adopts 2000ppm magnesium sulfate solution as the test solution under the pressure of pH value of 7-8 and 1.0MPa, the average water flux reaches more than 20L/m2.H, and the rejection rate of the nanofiltration membrane to salt is more than or equal to 98 percent.
While the invention has been described in detail in the foregoing general description and specific examples, it will be apparent to those skilled in the art that modifications and improvements can be made thereto. Accordingly, such modifications or improvements may be made without departing from the spirit of the invention and are intended to be within the scope of the invention as claimed.
Claims (10)
1. A method for preparing a three-dimensional crosslinked reticulated hydrophilic coating based on a polyolefin microporous membrane, comprising the steps of:
(1) Coating a solution A containing hydrophilic polymers on the surface of a polyolefin microporous membrane serving as a base membrane, rolling the solution A by using a rubber roller to submerge the polyolefin microporous membrane for 5-10 min, and removing the redundant solution A on the membrane surface of the polyolefin microporous membrane by using the rubber roller or an air knife to obtain the hydrophilic polyolefin microporous base membrane;
(2) Firstly placing the hydrophilic polyolefin microporous base film in an oven at 40-100 ℃ to be dried, then soaking pure water for 2-5 min, and removing excessive water on the film surface of the hydrophilic polyolefin microporous base film by adopting a rubber roller or an air knife;
(3) Dipping the hydrophilic polyolefin microporous base film soaked with pure water in a solution B containing a cross-linking agent for 2-5 minutes, and removing the redundant solution B on the surface of the hydrophilic polyolefin microporous base film by using a rubber roller or an air knife;
(4) Standing the hydrophilic polyolefin microporous base film which is dip-coated with the solution B at room temperature for 5-15 min, and airing to be semi-dry;
(5) Dipping the hydrophilic polyolefin microporous base film which is kept stand at room temperature in a solution C containing hydrophilic polymers, dipping the hydrophilic polyolefin microporous base film for 2-5 minutes, and removing the redundant solution C on the film surface of the hydrophilic polyolefin microporous base film by using a rubber roller or an air knife;
(6) And (3) placing the hydrophilic polyolefin microporous base film immersed in the solution C in an oven at 40-80 ℃ for 5-20 min, and taking out for later use.
2. The method for preparing a three-dimensional crosslinked reticular hydrophilic coating based on a polyolefin microporous membrane according to claim 1, wherein the material of the polyolefin microporous membrane is selected from one of polyethylene, polypropylene, polyvinyl chloride, polybutene, polydicyclopentadiene, polytetrafluoroethylene and polyvinylidene fluoride;
the porosity of the polyolefin microporous membrane is between 30 and 60 percent;
the average pore diameter of the polyolefin microporous membrane is between 0.02 and 0.4 micron;
the polyolefin microporous membrane has an average thickness of between 20 and 120 microns.
3. The method for preparing a three-dimensional crosslinked network hydrophilic coating based on a polyolefin microporous membrane according to claim 1, wherein the hydrophilic polymer solution a dip-coated on the surface of the polyolefin microporous membrane comprises: amphiphilic solvent, hydrophilic polymer, surfactant and pure water.
4. The method for preparing a three-dimensional crosslinked reticular hydrophilic coating based on a polyolefin microporous membrane according to claim 3, wherein the amphiphilic solvent is at least one of methanol, ethanol, isopropanol, and acetone;
the mass ratio of the amphiphilic solvent in the solution A is 5-50 wt%.
5. The method for preparing a three-dimensional crosslinked reticular hydrophilic coating based on a polyolefin microporous membrane according to claim 4, wherein the hydrophilic polymer is at least one of chitin, chitosan, cellulose, polyvinyl alcohol, polyethylene glycol, polyvinylpyrrolidone, polyacrylic acid and polyacrylamide;
the hydrophilic polymer in the solution A accounts for 0.5-5wt%.
6. The method for preparing a three-dimensional crosslinked reticular hydrophilic coating based on a polyolefin microporous membrane according to claim 5, wherein the surfactant is at least one of sodium dodecyl benzene sulfonate, sodium dodecyl sulfate, sodium polystyrene sulfonate, glycerin, polyethylene glycol, polyoxyethylene nonylphenol ether, polysorbate, polyoxyethylene fatty acid ester, polyoxyethylene fatty alcohol ether;
the mass ratio of the surfactant in the solution A is 0.1-0.5wt%.
7. The method for preparing a three-dimensional crosslinked reticulated hydrophilic coating based on a polyolefin microporous membrane according to claim 1, wherein the solution B for dip-coating the hydrophilic polyolefin microporous base membrane comprises: a crosslinking agent, a crosslinking reaction catalyst and pure water.
8. The method for preparing a three-dimensional crosslinked reticular hydrophilic coating based on a polyolefin microporous membrane according to claim 7, wherein the crosslinking agent is at least one of glyoxal, glutaraldehyde, p-tolualdehyde, crotonaldehyde, oxalic acid, malonic acid, citric acid, maleic anhydride, glycidyl methacrylate, and tris (hydroxymethyl) aminomethane;
the mass ratio of the cross-linking agent in the solution B is 0.05-0.5wt%.
9. The method for preparing a three-dimensional crosslinked reticular hydrophilic coating based on a polyolefin microporous membrane according to claim 8, wherein the crosslinking reaction catalyst is at least one of sulfuric acid, hydrochloric acid, phosphoric acid and other acid reagents;
the mass ratio of the crosslinking reaction catalyst in the solution B is 0.01-0.5wt%.
10. The method for preparing a three-dimensional crosslinked network hydrophilic coating based on a polyolefin microporous membrane according to claim 1, wherein the solution C for dip-coating the hydrophilic polyolefin microporous base membrane comprises: hydrophilic polymer and pure water;
the hydrophilic polymer is at least one of chitin, chitosan, cellulose, polyvinyl alcohol, polyethylene glycol, polyvinylpyrrolidone, polyacrylic acid and polyacrylamide;
the hydrophilic polymer in the solution C accounts for 0.5-5wt%.
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