阅读说明：本技术 一种涂层修饰pan纳米纤维过滤膜及其制备方法和应用、pan过滤材料及其应用 (Coating modified PAN nanofiber filtering membrane, preparation method and application thereof, PAN filtering material and application thereof ) 是由 于吉红 王琪菲 邸建成 于 2021-01-28 设计创作，主要内容包括：本发明提供了一种涂层修饰PAN纳米纤维过滤膜及其制备方法和应用、PAN过滤材料及其应用,属于过滤材料技术领域。本发明提供的涂层修饰PAN纳米纤维过滤膜PAN纳米纤维和位于所述PAN纳米纤维表面的修饰层；所述修饰层的表面具有极性基团；所述极性基团包括氨基、氰基、羧基、羟基和羰基中的一种或几种。本发明制备的涂层修饰PAN纳米纤维过滤膜具有高柔性、高强度、高极性溶剂耐受性,可重复消毒使用；能够作为油水分离、电池隔膜、液相催化和空气过滤的材料。(The invention provides a coating modified PAN nanofiber filtering membrane, a preparation method and application thereof, a PAN filtering material and application thereof, and belongs to the technical field of filtering materials. The coating modifies PAN nanofiber filtering membrane PAN nanofibers and a modifying layer positioned on the surface of the PAN nanofiber; the surface of the modification layer is provided with polar groups; the polar group comprises one or more of amino, cyano, carboxyl, hydroxyl and carbonyl. The coating modified PAN nanofiber filtering membrane prepared by the method has the advantages of high flexibility, high strength, high polar solvent tolerance and repeated disinfection and use; can be used as materials for oil-water separation, battery diaphragm, liquid phase catalysis and air filtration.)

1. The coating modified PAN nanofiber filtering membrane comprises PAN nanofibers and a modifying layer positioned on the surfaces of the PAN nanofibers; the surface of the modification layer is provided with polar groups;

the polar group comprises one or more of amino, cyano, carboxyl, hydroxyl and carbonyl.

2. The coating-modified PAN nanofiber filtration membrane according to claim 1, wherein the diameter of the nanofibers of the coating-modified PAN nanofiber filtration membrane is 200-800 nm.

3. A method for the preparation of a coating-modified PAN nanofibrous filtration membrane according to claim 1 or 2, comprising the steps of:

mixing PAN raw material, cyano compound containing polar end group, hydrazine hydrochloride, hydrazine hydrate and glycol, and carrying out addition polymerization reaction to obtain the coating modified PAN nanofiber filtering membrane.

4. The preparation method according to claim 3, wherein the polar end group of the cyano compound having a polar end group comprises one or more of an amino group, a cyano group, a carboxyl group, a hydroxyl group and a carbonyl group;

the molar ratio of the PAN raw material to the cyano compound containing the polar end group is 1: (1-10);

the molar ratio of the cyano compound containing the polar terminal group to the hydrazine hydrochloride to the hydrazine hydrate is (0.5-1): (1-2): (5-11).

5. The process according to claim 3 or 4, wherein the temperature of the addition polymerization is 130 ℃ and the time is 2 to 7 hours.

6. The method of claim 3 or 4, wherein the PAN raw material comprises PAN powder or PAN nanofibers.

7. The method for preparing PAN nanofiber according to claim 6, wherein the method for preparing PAN nanofiber comprises the following steps: dissolving polyacrylonitrile in a solvent to obtain a spinning solution; and carrying out electrostatic spinning on the spinning solution to obtain the PAN nanofiber.

8. The method of claim 7, wherein the operating parameters of the electrospinning include: the receiving distance is 10-20 cm; the voltage intensity of the positive electrode is 10-15 kV; the voltage intensity of the negative electrode is-0.5 to-1 kV.

9. A PAN filter material comprising a substrate and a PAN nanofiber filtration membrane modified with a coating on the surface of the substrate;

the coating modified PAN nanofiber filtering membrane is the coating modified PAN nanofiber filtering membrane described in any one of claims 1-2 or the coating modified PAN nanofiber filtering membrane obtained by the preparation method described in any one of claims 3-8.

10. Use of the coating-modified PAN nanofiber filtration membrane according to any one of claims 1 to 2, the coating-modified PAN nanofiber filtration membrane obtained by the production method according to any one of claims 3 to 8, or the PAN filtration material according to claim 9 for oil-water separation, battery separators, liquid phase catalysis, or air filtration.

Technical Field

The invention relates to the technical field of filter materials, in particular to a coating modified PAN nanofiber filter membrane, a preparation method and application thereof, a PAN filter material and application thereof.

Background

The mask body of the daily protective mask is made of a filtering material, and a wearer overcomes the resistance of the filtering material to air flow by autonomous respiration. When breathing in, the low air pressure in the mask makes the air flow into the mask; when the respirator breathes out, the air pressure in the respirator is higher than the ambient air pressure, and the air flow is discharged through the respirator. When the mask filter material meets the standard requirements and the mask is sufficiently sealed to the user's face, most of the inspiratory air flow is filtered through the filter material.

The traditional medical protective mask comprises an inner layer, a middle layer and an outer layer, wherein the inner layer is made of common sanitary gauze or non-woven fabric, the middle layer is a micron-sized polypropylene fiber melt-blown filter layer, and the outer layer is made of non-woven fabric or ultrathin polypropylene melt-blown material layer. The medical protective mask is strong in hydrophobic air permeability, and the filtering performance of the medical protective mask is improved mainly by capturing fine particles in the air through electrostatic injection. However, after the micron-sized polypropylene fiber melt-blown filter layer is treated by liquid disinfection means such as alcohol, water vapor and disinfectant, the injected static electricity disappears, so that the filtering efficiency is greatly reduced, and the filter layer cannot be repeatedly disinfected and used.

Disclosure of Invention

In view of the above, the invention aims to provide a coating modified PAN nanofiber filtering membrane, a preparation method and application thereof, a PAN filtering material and application thereof.

In order to achieve the above object, the present invention provides the following technical solutions:

the invention provides a coating modified PAN nanofiber filtering membrane, which comprises PAN nanofibers and a modification layer positioned on the surface of the PAN nanofibers; the surface of the modification layer is provided with polar groups;

the polar group comprises one or more of amino, cyano, carboxyl, hydroxyl and carbonyl.

Preferably, the diameter of the nanofiber of the PAN nanofiber filter membrane modified by the coating is 200-800 nm.

The invention provides a preparation method of a PAN nanofiber filtering membrane modified by a coating, which comprises the following steps:

mixing PAN raw material, cyano compound containing polar end group, hydrazine hydrochloride, hydrazine hydrate and glycol, and carrying out addition polymerization reaction to obtain the coating modified PAN nanofiber filtering membrane.

Preferably, the polar end group of the cyano compound containing a polar end group comprises one or more of amino, cyano, carboxyl, hydroxyl and carbonyl;

the molar ratio of the PAN raw material to the cyano compound containing the polar end group is 1: (1-10);

the molar ratio of the cyano compound containing the polar terminal group to the hydrazine hydrochloride to the hydrazine hydrate is (0.5-1): (1-2): (5-11).

Preferably, the temperature of the addition polymerization reaction is 130 ℃, and the time is 2-7 h.

Preferably, the PAN material comprises PAN powder or PAN nanofibers.

Preferably, the preparation method of the PAN nanofibers comprises the following steps: dissolving polyacrylonitrile in a solvent to obtain a spinning solution; and carrying out electrostatic spinning on the spinning solution to obtain the PAN nanofiber.

Preferably, the working parameters of the electrostatic spinning comprise: the receiving distance is 10-20 cm; the voltage intensity of the positive electrode is 10-15 kV; the voltage intensity of the negative electrode is-0.5 to-1 kV.

The invention also provides a PAN filtering material, which comprises a substrate and a PAN nanofiber filtering membrane modified by a coating positioned on the surface of the substrate;

the coating modified PAN nanofiber filtering membrane is the coating modified PAN nanofiber filtering membrane in the technical scheme or the coating modified PAN nanofiber filtering membrane obtained by the preparation method in the technical scheme.

The invention also provides the application of the coating modified PAN nanofiber filtering membrane in the technical scheme, the coating modified PAN nanofiber filtering membrane obtained by the preparation method in the technical scheme or the PAN filtering material in the technical scheme in oil-water separation, battery diaphragm, liquid phase catalysis or air filtration.

The invention provides a coating modified PAN nanofiber filtering membrane, which comprises PAN nanofibers and a modifying layer positioned on the surface of the PAN nanofibers, wherein the PAN nanofibers are coated with a coating; the surface of the modification layer is provided with polar groups; the polar group comprises one or more of amino, cyano, carboxyl, hydroxyl and carbonyl. The surface of the coating modified PAN nanofiber filtering membrane provided by the invention contains polar groups, and the polar groups and particles in the air have polar action, so that the coating modified PAN nanofiber filtering membrane can efficiently adsorb and remove fine particles, the filtering efficiency is always kept in a stable state, the level of N97 can be reached, and the filtering rate is high; is foldable, twistable and highly flexible; the filter membrane has extremely high stability in polar solution, and under the action of various disinfection means such as heating treatment, steam treatment, alcohol soaking, hypochlorous acid disinfection water soaking treatment, ultraviolet sterilization lamp irradiation treatment and the like, the polar effect between polar groups and particles in the air is not influenced, so that the filtering performance of the coating modified PAN nanofiber filter membrane is not weakened, the pressure drop of the coating modified PAN nanofiber filter membrane is not enhanced, and the PAN nanofiber filter membrane can be repeatedly disinfected for use; the macroscopic surface and the microscopic surface of the PAN nanofiber filtering membrane modified by the coating after repeated disinfection are intact. Can be used as materials for oil-water separation, battery diaphragm, liquid phase catalysis and air filtration.

The invention provides a preparation method of the coating modified PAN nanofiber filtering membrane in the technical scheme, which comprises the following steps: mixing PAN raw material, cyano compound containing polar end group, hydrazine hydrochloride, hydrazine hydrate and glycol, and carrying out addition polymerization reaction to obtain the coating modified PAN nanofiber filtering membrane. The preparation method provided by the invention is simple to operate and suitable for industrial production.

The invention provides a PAN filter material, which is obtained by covering the coating modified PAN nanofiber filter membrane in the technical scheme or the coating modified PAN nanofiber filter membrane obtained by the preparation method in the technical scheme on the surface of a substrate. According to the invention, the substrate is modified by the modification layer containing the polar group, the group change on the surface of the substrate is changed, the surface of the substrate contains the polar group, and the polar group and particles in the air have a polar effect, so that the PAN nanofiber filtering membrane modified by the coating can efficiently adsorb and remove fine particles, the filtering efficiency is always kept in a stable state, the level of N97 can be reached, and the filtering rate is high; is foldable, twistable and highly flexible; the filter material has extremely high stability in polar solution, and under the action of various disinfection means such as heating treatment, water vapor treatment, alcohol soaking, hypochlorous acid disinfection water soaking treatment, ultraviolet sterilization lamp irradiation treatment and the like, the polar effect between polar groups and particles in the air is not influenced, so that the filtering performance of the PAN filter material is not weakened, the pressure drop of the PAN filter material is not enhanced, and the PAN filter material can be repeatedly disinfected and used; both the macroscopic and microscopic surfaces of the PAN filter material after repeated sterilization were intact. Can be used as materials for oil-water separation, battery diaphragm, liquid phase catalysis and air filtration.

Drawings

FIG. 1 is a scanning electron micrograph of a coating modified PAN nanofiber filtration membrane prepared according to example 1;

FIG. 2 is a scanning electron microscope image of the PAN nanofiber filter membrane modified with the coating prepared in example 1 after adsorbing solid particles;

FIG. 3 is a scanning electron micrograph of a coating modified PAN nanofiber filtration membrane prepared according to example 2;

FIG. 4 is a scanning electron microscope image of the PAN nanofiber filter membrane modified with the coating prepared in example 2 after adsorbing solid particles;

FIG. 5 is a graph showing the results of flexibility of a coating-modified PAN nanofiber filtration membrane prepared in example 1, wherein a is a fold pattern and b is a twist pattern;

FIG. 6 is a graph of the tensile properties of a coating modified PAN nanofiber filtration membrane prepared in example 1;

FIG. 7 is a graph showing the results of solvent resistance performance of the coating-modified PAN nanofiber filtration membrane prepared in example 1, wherein a₁) Is a graph of the anti-solvent performance of PAN nanofibers in DMF and DMSO for 0min, a₂) Is a plot of the solvent resistance of PAN nanofibers in DMF and DMSO for 90d, b₁) Anti-solvent for coating modification of PAN nanofiber filter membrane in DMF and DMSO for 0minPerformance map, b₂) Modifying 90d anti-solvent performance diagram of the PAN nanofiber filtering membrane in DMF and DMSO for the coating;

FIG. 8 is a graph of the effect of different sterilization means on the coating modified PAN nanofiber filtration membrane prepared in example 1;

FIG. 9 is a material diagram and a scanning electron microscope diagram of the coating modified PAN nanofiber filtering membrane treated by alternately circulating 75% alcohol and hypochlorous acid disinfectant water for 5 times, wherein a is the material diagram and b is the scanning electron microscope diagram.

Detailed Description

The invention provides a coating modified PAN nanofiber filtering membrane, PAN nanofibers and a modifying layer positioned on the surface of the PAN nanofibers; the surface of the modification layer is provided with polar groups; the polar group comprises one or more of amino, cyano, carboxyl, hydroxyl and carbonyl.

In the invention, the diameter of the nanofiber of the PAN nanofiber filtering membrane modified by the coating is preferably 200-800 nm, more preferably 300-700 nm, even more preferably 400-600 nm, and most preferably 400-500 nm.

The invention provides a preparation method of a PAN nanofiber filtering membrane modified by a coating, which comprises the following steps:

mixing PAN raw material, cyano compound containing polar end group, hydrazine hydrochloride, hydrazine hydrate and glycol, and carrying out addition polymerization reaction to obtain the coating modified PAN nanofiber filtering membrane.

In the present invention, all the raw material components are commercially available products well known to those skilled in the art unless otherwise specified.

In the present invention, the PAN (polyacrylonitrile) raw material preferably includes PAN powder or PAN nanofibers. The particle size of the PAN powder is not particularly limited, and the PAN powder is free from caking. The source and molecular weight of the PAN powder are not particularly limited in the invention, and commercially available industrial-grade PAN powder well known to those skilled in the art can be used; in an embodiment of the invention, the PAN powder is purchased from a gillin chemical plant, has a molecular weight of 150000 and a purity of 90%.

In the present invention, the PAN nanofiber manufacturing method preferably includes the steps of: dissolving polyacrylonitrile in a solvent to obtain a spinning solution; and carrying out electrostatic spinning on the spinning solution to obtain the PAN nanofiber.

The invention dissolves polyacrylonitrile in solvent to obtain spinning solution. In the present invention, the polyacrylonitrile is preferably industrial-grade PAN powder. In the present invention, the solvent preferably includes one or more of N' N-Dimethylformamide (DMF), N-Dimethylacetamide (DMAC), and Dimethylsulfoxide (DMSO). In the invention, the concentration of PAN in the spinning solution is preferably 10-15 wt%, more preferably 11-14 wt%, and even more preferably 12-13 wt%.

After the dissolving, the present invention preferably further comprises allowing the solution to stand to obtain a spinning solution. In the invention, the temperature of the standing is preferably room temperature, and the time of the standing is preferably 0.5-6 h, more preferably 1-5 h, and even more preferably 2-3 h. In the present invention, the purpose of the standing is to make the inside of the spinning liquid stable without bubbles.

After the spinning solution is obtained, the invention carries out electrostatic spinning on the spinning solution to obtain the PAN nanofiber.

In the present invention, the working parameters of the electrostatic spinning include: the receiving distance is preferably 10-20 cm, more preferably 12-18 cm, and even more preferably 14-15 cm; the voltage intensity of the positive electrode is preferably 10-15 kV, more preferably 11-14 kV, and even more preferably 12-13 kV; the voltage intensity of the negative electrode is preferably-0.5 to-1 kV, more preferably-0.6 to-0.9 kV, and even more preferably-0.7 to-0.8 kV; the bearing area of the electrostatic spinning is not specially limited, and the bearing area is determined according to actual needs; in an embodiment of the present invention, the receiving area is preferably 20cm × 20 cm. The equipment and operation used for said electrostatic spinning is not specifically limited, and those known to those skilled in the art can be used. In an embodiment of the present invention, the spinning solution is preferably injected into a disposable syringe, which is then placed in an electrospinning apparatus for electrospinning. In the present invention, the volume of the disposable needle tube is preferably 5 to 20mL, and more preferably 10 to 20 mL. The equipment used for said electrostatic spinning is not specifically limited, and electrostatic spinning equipment known to those skilled in the art can be used.

After the electrostatic spinning, the invention preferably further comprises the step of standing the electrostatic spinning product to obtain the PAN nanofiber. In the present invention, the temperature of the standing is preferably room temperature, and the time of the standing is not particularly limited in the present invention, and the solvent in the PAN nanofibers may be removed. The PAN nanofiber prepared by the method is a porous fiber membrane material with a complete nanofiber structure.

In the present invention, the polar end group of the cyano compound having a polar end group includes one or more of an amino group, a cyano group, a carboxyl group, a hydroxyl group and a carbonyl group, and more preferably a cyano group; the cyano compound having a polar end group preferably includes one or more of 4-cyanobenzoic acid, terephthalonitrile, and 4-cyanophenol.

In the present invention, the molar ratio of the PAN raw material and the cyano compound having a polar terminal group is preferably 1: (1 to 10), more preferably 1: (1-5), more preferably 1: (2-3).

In the present invention, the molar ratio of the polar end group-containing cyano compound to hydrazine hydrochloride to hydrazine hydrate is preferably (0.5 to 1): (1-2): (5-11), more preferably (0.6-0.9): (1.2-1.8): (6-9), more preferably (0.7-0.8): (1.4-1.5): (7-8).

In the present invention, the molar percentage of the polar end group-containing cyano compound in ethylene glycol is preferably 0.5 to 1%, more preferably 0.6 to 0.9%, and still more preferably 0.7 to 0.8%.

In the present invention, the order in which the PAN raw material, the cyano compound having a polar end group, hydrazine hydrochloride, hydrazine hydrate, and ethylene glycol are mixed is preferably such that the cyano compound having a polar end group, hydrazine hydrochloride, hydrazine hydrate, and ethylene glycol are mixed to obtain a liquid phase system, and then the PAN raw material is immersed in the liquid phase system.

In the present invention, the temperature of the addition polymerization reaction is preferably 130 ℃; the time of the addition polymerization reaction is preferably 2 to 7 hours, more preferably 3 to 6 hours, and even more preferably 4 to 5 hours. In the present invention, the product turned from white to orange-yellow during the addition polymerization.

After the addition polymerization reaction, the invention preferably further comprises drying the addition polymerization reaction system to obtain the coating modified PAN nanofiber filtering membrane. In the present invention, the drying temperature and time are not particularly limited, and the drying may be carried out to a constant weight.

The invention also provides a PAN filtering material, which comprises a substrate and a PAN nanofiber filtering membrane modified by a coating positioned on the surface of the substrate;

the coating modified PAN nanofiber filtering membrane is the coating modified PAN nanofiber filtering membrane in the technical scheme or the coating modified PAN nanofiber filtering membrane obtained by the preparation method in the technical scheme.

In the present invention, the substrate preferably comprises polyacrylonitrile, polypropylene, terylene, chinlon, viscose fiber, acrylon, polyethylene or polyvinyl chloride.

In the invention, the coverage of the coating modified PAN nanofiber filtering membrane is preferably 0.5-1 g/m²More preferably 0.6 to 0.8g/cm²。

The invention also provides the application of the coating modified PAN nanofiber filtering membrane in the technical scheme, the coating modified PAN nanofiber filtering membrane obtained by the preparation method in the technical scheme or the PAN filtering material in the technical scheme in oil-water separation, battery diaphragm, liquid phase catalysis or air filtration.

The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

Dissolving industrial PAN powder (molecular weight of 150000) in DMF, and standing at room temperature for 2h to obtain spinning solution, wherein the concentration of PAN in the spinning solution is 12 wt%.

Injecting the spinning solution into a 10mL disposable needle tube, placing the needle tube in electrostatic spinning equipment, performing electrostatic spinning, and standing at room temperature until DMF is removed to obtain PAN (polyacrylonitrile) nanofibers;

and (2) placing 0.5g of PAN nanofiber in a 100mL liquid phase system, performing polyaddition reaction for 3h at 130 ℃, drying the product to constant weight, and obtaining the coating modified PAN nanofiber filtering membrane made of the light yellow film-shaped material, wherein the mole percentage composition of the liquid phase system comprises 86% of ethylene glycol, 1% of terephthalonitrile, 2% of hydrazine hydrochloride and 11% of hydrazine hydrate.

As can be seen from fig. 1-2, the PAN nanofiber filtration membrane modified by the coating prepared in this embodiment has a uniform fiber diameter, and has a complicated vermicular pore channel inside, and can capture particulate matter larger than PM 5.

The PAN nanofiber filtering membrane modified by the coating prepared by the embodiment can be used for efficiently capturing particles below 300nm, and tests show that the filtering efficiency is up to 97%, and the filtering effect is excellent.

And carrying out electrostatic injection operation on the coating modified PAN nanofiber filtering membrane to obtain uniform injection amount, then efficiently capturing particles below 300nm, and testing shows that the filtering efficiency is up to 98%.

Example 2

A coating modified PAN nanofiber filtration membrane was prepared as in example 1, except that 4-cyanobenzoic acid was used instead of terephthalonitrile.

The scanning electron microscope image of the PAN nanofiber filtration membrane modified by the coating prepared in the embodiment is shown in fig. 3, and the scanning electron microscope image after adsorbing particles is shown in fig. 4, as can be seen from fig. 3 to 4, the PAN nanofiber filtration membrane modified by the coating prepared in the embodiment has a uniform fiber diameter, and has a complex vermicular pore canal inside, so that particulate matters larger than PM5 can be captured.

The coating-modified PAN nanofiber filtering membrane prepared by the embodiment can be used for efficiently capturing particles below 300nm, the efficiency is up to 97%, and the filtering effect is excellent.

And carrying out electrostatic injection operation on the coating modified PAN nanofiber filtering membrane to obtain uniform injection amount, then efficiently capturing particles below 300nm, and testing shows that the filtering efficiency is up to 98%.

Test example

(1) The flexibility results of the coating modified PAN nanofiber filtration membrane prepared in example 1 are shown in fig. 5, wherein a is a fold pattern and b is a twist pattern. As can be seen from FIG. 5, the coating modified PAN nanofiber filtering membrane prepared by the method can be folded and twisted, and has high flexibility; the flexibility results of the PAN nanofiber filtration membrane modified with the coating prepared in example 2 were the same.

(2) The tensile properties of the coating modified PAN nanofiber filtration membrane prepared in example 1 are shown in fig. 6. As can be seen from fig. 6, the coating modification process has no major effect on the tensile properties of the PAN material itself, and the coating-modified PAN nanofiber filtration membrane still maintains the tensile properties of PAN. The coating modified PAN nanofiber filtering membrane prepared by the method has high strength; the tensile properties of the coating modified PAN nanofiber filtration membrane prepared in example 2 were the same.

(3) The results of the solvent resistance performance of the coating-modified PAN nanofiber filtration membrane prepared in example 1 are shown in fig. 7, wherein a₁) A solvent resistance graph of a PAN nanofiber filtering membrane modified by a coating in DMF and DMSO for 0min, a₂) Solvent resistance profile of PAN nanofiber filtration membranes in DMF and DMSO for 90d modification of the coating, b₁) Solvent resistance diagram of PAN nanofiber filter membrane modified for coating in DMF and DMSO for 0min, b₂) And modifying 90d anti-solvent performance diagram of the PAN nanofiber filtering membrane in DMF and DMSO for the coating. As can be seen from FIG. 7, the PAN nanofiber filtering membrane modified by the coating still exists stably after being soaked in DMF and DMSO for 90 days, and the surface of the PAN nanofiber filtering membrane modified by the coating has no damage or dissolution tendency, which illustrates that the PAN nanofiber filtering membrane modified by the coating provided by the invention has no damage or dissolution tendencyThe tolerance of the nanofiber filtering membrane in a high-polarity solvent is strong; the anti-solvent properties of the coating modified PAN nanofiber filtration membranes prepared in example 2 were the same.

(4) The effect of different disinfection means on the coating modified PAN nanofiber filtration membrane prepared in example 1 is shown in fig. 8, and it can be seen from fig. 8 that the drying treatment (i.e., heating), steam treatment, alcohol soaking treatment, ultraviolet sterilization lamp irradiation treatment and hypochlorous acid disinfection water soaking treatment do not weaken the filtration performance of the coating modified PAN nanofiber filtration membrane nor enhance the pressure drop of the material, which indicates that the coating modified PAN nanofiber filtration membrane prepared by the present invention can be repeatedly sterilized and used; the repeated disinfection effect of the coating modified PAN nanofiber filter membrane prepared in example 2 is the same.

(5) An object diagram and a scanning electron microscope diagram of the coating modified PAN nanofiber filtering membrane subjected to alternate circulation treatment with 75% alcohol and hypochlorous acid disinfectant water for 5 times are shown in FIG. 9, wherein a is the object diagram and b is the scanning electron microscope diagram. As can be seen from fig. 9, both the macroscopic surface and the microscopic surface of the PAN nanofiber filter membrane modified by the repeatedly sterilized coating were intact; the repeated disinfection effect of the coating modified PAN nanofiber filter membrane prepared in example 2 is the same.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.