CN106237717A - A kind of efficient low-resistance electrostatic spinning nano fiber air filting material and mass preparation method - Google Patents

Abstract

The invention relates to a high-efficiency and low-resistance electrospinning nanofiber air filter material and a batch preparation method. The filter material is a sandwich structure in which spunbond nonwovens and nanofibers are arranged alternately; a needle-free electrostatic spinning nozzle is used, and then The nanofiber/microsphere composite film was prepared through the synchronous combination of electrospinning and electrostatic spraying. The rotating drum was used as the receiving device, and the spunbonded nonwoven was used as the receiving substrate to obtain the nanofiber/nonwoven composite material, and then The surface is covered with a layer of spun-bonded non-woven fabric to form a sandwich structure in which the spun-bonded non-woven fabric and nanofibers are arranged alternately, and then bonded to obtain the finished product. The preparation process of the present invention is simple, controllable and repeatable, and the prepared air filter material has the characteristics of high efficiency and low resistance, uniform thickness, and stable filtration performance, and can realize batch production of nanofiber filter materials, and has a very good performance in the field of air filtration. application prospects.

Description

A high-efficiency and low-resistance electrospun nanofiber air filter material and its batch preparation method

technical field

The invention belongs to the field of air filter materials and preparation thereof, in particular to a high-efficiency and low-resistance electrospun nanofiber air filter material and a batch preparation method.

Background technique

With the deepening of my country's industrialization process and rapid economic development, the problem of air pollution is becoming more and more serious, especially in recent years, the PM2.5 (particles with a particle size less than 2.5 μm) pollution that has continued to appear in various parts of our country has caused serious threats to people's health. . Filtration as a protective measure can effectively resist the adverse effects of pollution on people. At present, my country's industry uses a large number of air filter materials based on glass fiber or melt-blown non-woven fabrics, which have a good filtering effect on particles above the micron level, but poor filtration efficiency on sub-micron or even nano-sized particles. , and there are problems such as large filtration resistance, small dust holding capacity, and short service life. Therefore, it is urgent to develop a new type of high-efficiency and low-resistance air filter material.

Electrospun nanofibers have the advantages of small fiber diameter, small pore size, large specific surface area, and high porosity. After combining it with a substrate, an ideal air filter material can be prepared. However, due to the fact that the diameter of electrospun fibers is submicron, high efficiency is usually accompanied by high filtration resistance. The existing literature mainly uses inorganic nanoparticles in the spinning solution to prepare porous fibers, and electret nanofiber membranes. A way to achieve high efficiency and low resistance. (1) Inorganic nanoparticles are added to the spinning solution, so that the fiber membrane has a multi-level surface rough structure, which increases the specific surface area, and the fiber cross section is non-circular, which reduces the filtration resistance while being efficient (N.Wang, Y.S.Si, N.Wang, et al.Multilevel structuredpolyacrylonitrile/silica nanofibrous membranes for high-performance airfiltration[J].Separation and Purification Technology,2014,126:44-51.). However, the amount of inorganic nanoparticles added is limited, too many nanoparticles will agglomerate, and the filtration efficiency of the fiber membrane will decrease instead, and the inorganic nanoparticles will fall off during use, posing a threat to people's health. (2) Preparation of porous fibers, patent CN103952783A discloses "a kind of beaded porous PLA nanofiber and its preparation method", using a low boiling point solvent, during the spinning process, the solvent evaporates rapidly, and induces rapid phase separation and solidification of the jet surface solution, Form a beaded porous fiber structure to achieve high efficiency and low resistance. However, the mechanical properties of porous fiber materials are poor, and the rapid volatilization of a large number of low-boiling solvents during the experiment will endanger people's health. (3) For nanofiber membrane electret, the patent CN104289042A discloses "an electrospun nanofiber electret filter material and its preparation" and prepared nano Fibrous electret filter material, but does not give relevant data on whether the surface charge of the material will dissipate after long-term storage. During the storage and use of electret materials, the moisture and particles in the air will accelerate the dissipation of the surface charge of the electret materials, which will gradually attenuate the electret effect and eventually lead to a decrease in the filtration efficiency of the materials. The low output of electrospun nanofiber materials has always been a technical difficulty restricting its industrial production. The above methods and patents have not solved the problem that electrospun nanofiber filter materials cannot be produced in batches.

Contents of the invention

The technical problem to be solved by the present invention is to provide a high-efficiency and low-resistance electrospun nanofiber air filter material and a batch preparation method. The process of the method is simple, controllable and repeatable, and the prepared air filter material has the characteristics of high efficiency and low resistance. , uniform thickness, stable filtration performance, can realize mass production of nanofiber filter materials, and has very good application prospects in the field of air filtration.

A high-efficiency and low-resistance electrospun nanofiber air filter material of the present invention, the filter material is a sandwich structure of spunbonded nonwovens and nanofibers arranged alternately, the nanofiber is an electrospun nanofiber/microsphere composite film, wherein the electrostatic The structure of the spun nanofiber/microsphere composite membrane is: a three-dimensional cavity structure formed by microspheres embedded between electrospun nanofibers.

The spun-bonded nonwoven fabric has a fiber diameter of 1-10 μm, a grammage of 10-120 g/m ² , and an initial filtration efficiency of 0.1%-5%.

The diameter of the electrospun nanofiber is 100-300nm; the particle diameter of the microsphere is 500-800nm.

A high-efficiency and low-resistance electrospun nanofiber air filter material and a batch preparation method of the present invention include:

(1) adding the polymer into the solvent and stirring to obtain a high-concentration electrospinning polymer solution; wherein the mass percent concentration of the electrospinning polymer solution is 10-40%;

(2) adding the polymer into the solvent and stirring to obtain a low-concentration electrostatic spray polymer solution; wherein the mass percent concentration of the electrostatic spray polymer solution is 3-30%;

(3) Using a needle-free electrospinning nozzle, and then synchronously combining electrospinning and electrostatic spraying technology, the nanofiber/microsphere composite film is prepared, with the rotating drum as the receiving device, and the spunbonded nonwoven fabric as the receiving base material to obtain nanofiber/nonwoven fabric composite material, the grammage of electrospun nanofiber/microsphere composite film can be adjusted to be 0.1-10g/m ² by adjusting the spinning time;

(4) Cover the surface of the nanofiber/nonwoven fabric composite with a layer of spunbonded nonwoven fabric to form a sandwich structure in which the spunbonded nonwoven fabric and nanofibers are arranged alternately, and then bonded to obtain the electrospun nanofiber air filter material.

The polymers in the steps (1) and (2) are polyacrylonitrile, polyurethane, polysulfone, polyvinylpyrrolidone, polyvinylidene fluoride, polyethylene oxide, polystyrene, polymethyl methacrylate, polyethylene glycol One or more of lactone, polycaprolactam, chitosan; the solvents are N,N-dimethylformamide, N,N-dimethylacetamide, dimethyl sulfoxide, acetone, tetrahydrofuran, One or more of dichloromethane, chloroform, hexafluoroisopropanol, formic acid, acetic acid, and ethanol.

The stirring in the steps (1) and (2) is magnetic stirring for 10-12h.

In step (3), insulating materials are used to divide the surface of the needle-free electrospinning nozzle from the center into 2-8 parts with the same area or length, and the electrospinning polymer solution and the electrostatic spraying polymer solution are injected into different parts respectively. Part of it is spun through the combination of electrospinning and electrostatic spraying.

The insulating material is one of polytetrafluoroethylene, polyvinylidene fluoride, polymethyl methacrylate, polycarbonate, polyethylene, polypropylene and polystyrene.

The specific process parameters of the synchronous combination technology of electrospinning and electrostatic spraying in the step (3) are: spinning voltage 40-75KV, drum speed 10-400r/min, distance between nozzle and drum 10-25cm, nozzle lateral movement The speed is 10-300cm/min, the liquid supply speed is 20-500mL/h, the ambient temperature is 20-35°C, and the ambient humidity is 20-80%.

The whole spinning machine is airtight, and there are temperature and humidity detection and automatic control devices in the airtight space. The spinning nozzle is connected to the traverse mechanism, the spinning nozzle is connected to the infusion tube, and the other end of the infusion tube is connected to the liquid supply device. The whole spinning process In the process, the liquid supply device continuously and stably supplies liquid to the nozzle to ensure continuous spinning and realize the mass production of electrospun nanofiber materials.

The bonding treatment in the step (4) is ultrasonic bonding. This bonding method has little damage to the nanofibers, and the processed composite material can still maintain the characteristics of high efficiency and low resistance, and at the same time, the strength of the filter material has been greatly improved.

The invention adopts the needle-free electrostatic spinning nozzle, and through the synchronous combination of electrostatic spinning and electrostatic spraying technology, innovatively prepares the electrostatic spinning nanofiber/microsphere composite membrane, and obtains a high-efficiency and low-resistance nanofiber filter material in one step

The filter material prepared by the present invention has a three-dimensional cavity structure and good structural controllability, the filter material length is 1.6m, and the width is 0.6m, and the time used to produce a piece of filter material is 20-30min. The particle filtration efficiency with a number median diameter of 75nm can reach 99.99%, and the filtration resistance is 50-150Pa. After the nanofiber membrane structure is optimized by the method provided by the present invention, compared with ordinary nanofiber filter materials, the filtration efficiency can reach 99.99%. , the filter resistance is reduced by 35%.

Beneficial effect

(1) The present invention combines electrospinning and electrostatic spraying synchronously. After electrospinning, a high-concentration polymer solution forms fibers with a diameter of 100-300 nm, which can be used as a fiber membrane support structure. The low-concentration polymer solution is electrostatically sprayed to form microspheres with a diameter of 500-800nm. The microspheres are embedded between nanofibers, increasing the distance between fibers, forming a three-dimensional cavity structure, reducing filtration resistance, and low polymer The concentrated solution will form ultra-fine nanofibers with a diameter of about 80nm when forming microspheres, which can reduce the filtration resistance and improve the filtration efficiency. One-step molding has obtained high-efficiency and low-resistance nanofiber filter materials;

(2) The present invention adopts a needle-free electrospinning nozzle, which avoids the electric field mutual interference between a plurality of single-needle electrospinning needles and needles, resulting in poor uniformity of the obtained fiber film; the preparation method provided by the present invention, The thickness of the prepared nanofiber membrane is uniform, the filtration performance is stable, and the production efficiency is high. The time required to prepare a nanofiltration material with a length of 1.6m and a width of 0.6m is only 20-30min, which can realize electrospinning nanofiber air Mass production of filter materials;

(3) The process parameters of the present invention are simple and controllable, and the prepared nanofiber filter material has good structural controllability, and the packing density, pore size and pore size of the fiber material can be adjusted by adjusting the jet ratio of electrospinning and electrostatic spraying polymer solution precise regulation of the rate;

(4) The nanofiber filter material prepared by the present invention has small pore size and large porosity, and the existence of microspheres makes the material have a three-dimensional cavity structure, which has a large dust holding capacity in actual use and prolongs the life of the filter material. The service life of the filter material is improved, and it has a good practical application prospect.

Description of drawings

Fig. 1 is the flow chart of preparation of high-efficiency and low-resistance electrospun nanofiber air filter material of the present invention;

Fig. 2 is a SEM image of the high-efficiency and low-resistance electrospun nanofiber/microsphere composite film prepared in Example 1 of the present invention.

detailed description

Below in conjunction with specific embodiment, further illustrate the present invention. It should be understood that these examples are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the teachings of the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of the present application.

Example 1

The filter material is a sandwich structure of spunbonded non-woven fabrics and nanofibers arranged alternately. The nanofibers are electrospun nanofiber/microsphere composite membranes. The structure of the electrospun nanofiber/microsphere composite membrane is: microspheres embedded in electrospun nanofibers The three-dimensional cavity structure formed between them; the diameter of the nanofiber is 139nm; the particle diameter of the microsphere is 658nm; the weight of the electrospun nanofiber/microsphere composite film is 1.08g/m ² . The spunbonded nonwoven fabric used has a fiber diameter of 5 μm and a grammage of 25 g/m ² , and the initial filtration efficiency of the spunbonded nonwoven fabric is 0.2%.

A high-efficiency and low-resistance electrospun nanofiber air filter material and a batch preparation method, the specific steps are:

Step 1: Place the polyacrylonitrile powder in a vacuum drying oven and dry it under vacuum at 70°C for 8 hours;

Step 2: dissolve the dried polyacrylonitrile powder in N,N-dimethylformamide solvent, stir on a magnetic stirrer for 12 hours, and prepare a high-concentration solution of polyacrylonitrile with a mass fraction of 10 wt %;

Dissolve the dried polyacrylonitrile powder in N,N-dimethylformamide solvent, stir on a magnetic stirrer for 12 hours, and prepare a polyacrylonitrile low-concentration solution with a mass fraction of 5% by weight;

The third step: adopt an umbrella-shaped spinning nozzle (CN103088443A), use a polytetrafluoroethylene sheet to divide the surface of the nozzle into two parts with the same circumferential length from the center, and use a liquid supply device to fill the left half of the surface of the nozzle with 10wt% A high-concentration polyacrylonitrile solution, the right half of the nozzle surface is filled with a 5wt% low-concentration polyacrylonitrile solution, and a nanofiber/microsphere composite membrane is prepared by synchronously combining electrospinning and electrostatic spraying. Using spunbonded nonwoven fabric as the receiving substrate, the whole spinning process is carried out in a closed space, the spinning voltage is 65KV, the drum speed is 70r/min, the distance between the nozzle and the drum is 20cm, the nozzle traverse speed is 120cm/min, and the liquid supply The speed is 50mL/h, the ambient temperature is 23°C, the ambient humidity is 25%, and the spinning time is 20min;

Step 4: Cover the upper surface of the nanofiber/spunbonded nonwoven material obtained in the third step with a layer of nonwoven fabric to form a sandwich structure in which the spunbonded nonwoven fabric and nanofibers are arranged alternately, and finally undergo ultrasonic bonding Finally, the electrospun nanofiber air filter material is obtained.

The filtration efficiency of the nanofiber air filter material to particles with a number median diameter of 75nm can reach 99.99%, and the filtration resistance is 130.7Pa.

Example 2

The filter material is a sandwich structure of spunbonded non-woven fabrics and nanofibers arranged alternately. The nanofibers are electrospun nanofiber/microsphere composite membranes. The structure of the electrospun nanofiber/microsphere composite membrane is: microspheres embedded in electrospun nanofibers The three-dimensional cavity structure formed between them; the diameter of the nanofiber is 204nm; the particle diameter of the microsphere is 569nm; the weight of the electrospun nanofiber/microsphere composite film is 1.25g/m ² . The spunbonded nonwoven fabric used has a fiber diameter of 5 μm and a grammage of 30 g/m ² , and the initial filtration efficiency of the spunbonded nonwoven fabric is 0.2%.

A high-efficiency and low-resistance electrospun nanofiber air filter material and a batch preparation method, the specific steps are:

Step 1: Place the polyacrylonitrile powder in a vacuum drying oven and dry it under vacuum at 70°C for 8 hours;

Step 2: dissolve the dried polyacrylonitrile powder in dimethyl sulfoxide solvent, stir on a magnetic stirrer for 12 hours, and prepare a polyacrylonitrile high-concentration solution with a mass fraction of 12 wt %;

Dissolve the dried polyacrylonitrile powder in dimethyl sulfoxide solvent, stir on a magnetic stirrer for 12 hours, and prepare a polyacrylonitrile low-concentration solution with a mass fraction of 6 wt %;

The third step: adopt an umbrella-shaped spinning nozzle (CN103088443A), use a polytetrafluoroethylene sheet to divide the surface of the nozzle into four parts with the same circumferential length from the center, and use a liquid supply device to fill a part of the nozzle with 12wt% poly Acrylonitrile high-concentration solution, the other three parts are filled with 6wt% polyacrylonitrile low-concentration solution, and the nanofiber/microsphere composite membrane is prepared by synchronously combining electrospinning and electrostatic spraying technology. Using spunbonded nonwoven fabric as the receiving substrate, the whole spinning process is carried out in a closed space, the spinning voltage is 60KV, the drum speed is 100r/min, the distance between the nozzle and the drum is 15cm, and the nozzle traverse speed is 80cm/min. The liquid speed is 40mL/h, the ambient temperature is 25°C, the ambient humidity is 30%, and the spinning time is 30min;

Step 4: Cover the upper surface of the nanofiber/spunbonded nonwoven material obtained in the third step with a layer of nonwoven fabric to form a sandwich structure in which the spunbonded nonwoven fabric and nanofibers are arranged alternately, and finally undergo ultrasonic bonding Finally, the electrospun nanofiber air filter material is obtained.

The filtration efficiency of the nanofiber air filter material to particles with a number median diameter of 75nm can reach 99.91%, and the filtration resistance is 102.8Pa.

Example 3

The filter material is a sandwich structure of spunbonded non-woven fabrics and nanofibers arranged alternately. The nanofibers are electrospun nanofiber/microsphere composite membranes. The structure of the electrospun nanofiber/microsphere composite membrane is: microspheres embedded in electrospun nanofibers The three-dimensional cavity structure formed between them; the diameter of the nanofiber is 236nm; the particle diameter of the microsphere is 631nm; the weight of the electrospun nanofiber/microsphere composite film is 1.96g/m ² . The spunbonded nonwoven fabric used has a fiber diameter of 10 μm and a grammage of 30 g/m ² , and the initial filtration efficiency of the spunbonded nonwoven fabric is 0.1%.

A high-efficiency and low-resistance electrospun nanofiber air filter material and a batch preparation method, the specific steps are:

Step 1: Put the polyurethane particles in a vacuum drying oven and dry them under vacuum at 110°C for 8 hours;

Step 2: dissolve the dried polyurethane particles in N,N-dimethylformamide solvent, stir on a magnetic stirrer for 12 hours, and prepare a high-concentration polyurethane solution with a mass fraction of 35 wt %;

Dissolving the dried polyurethane particles in N,N-dimethylformamide solvent, stirring on a magnetic stirrer for 12 hours, and preparing a low-concentration polyurethane solution with a mass fraction of 20% by weight;

The third step: adopt an electrospinning device (CN104593880A) for mass production of polymer fibers, use a plurality of metal wires as the electrospinning nozzle, and use a polytetrafluoroethylene sheet to divide the liquid storage tank from the center to have the same length For the two parts, use the liquid supply device to fill the left half of the liquid storage tank with a high-concentration polyurethane solution of 35wt%, and fill the right half of the liquid storage tank with a low-concentration polyurethane solution of 20wt%, and synchronize it with electrostatic spraying through electrospinning Combining the technology, the nanofiber/microsphere composite membrane is prepared. Using spunbonded nonwoven fabric as the receiving substrate, the whole spinning process is carried out in a closed space, the spinning voltage is 70KV, the drum speed is 120r/min, the distance between the nozzle and the drum is 25cm, the nozzle traverse speed is 100cm/min, and the liquid supply The speed is 80mL/h, the ambient temperature is 27°C, the ambient humidity is 35%, and the spinning time is 25min;

Step 4: Cover the upper surface of the nanofiber/spunbonded nonwoven material obtained in the third step with a layer of nonwoven fabric to form a sandwich structure in which the spunbonded nonwoven fabric and nanofibers are arranged alternately, and finally undergo ultrasonic bonding Finally, the electrospun nanofiber air filter material is obtained.

The filtration efficiency of the nanofiber air filter material to particles with a number median diameter of 75nm can reach 99.26%, and the filtration resistance is 76.3Pa.

Example 4

The filter material is a sandwich structure of spunbonded non-woven fabrics and nanofibers arranged alternately. The nanofibers are electrospun nanofiber/microsphere composite membranes. The structure of the electrospun nanofiber/microsphere composite membrane is: microspheres embedded in electrospun nanofibers The three-dimensional cavity structure formed between them; the diameter of the nanofiber is 152nm; the particle diameter of the microsphere is 670nm; the weight of the electrospun nanofiber/microsphere composite film is 1.68g/m ² . The spunbonded nonwoven fabric used has a fiber diameter of 10 μm and a grammage of 35 g/m ² , and the initial filtration efficiency of the spunbonded nonwoven fabric is 0.2%.

A high-efficiency and low-resistance electrospun nanofiber air filter material and a batch preparation method, the specific steps are:

The first step: place the polyacrylonitrile powder in a vacuum drying oven, and dry it in vacuum at 70°C for 8 hours; put the polyvinylidene fluoride powder in a vacuum drying oven, and dry it in vacuum at 130°C for 8 hours;

Step 2: dissolve the dried polyacrylonitrile powder in dimethyl sulfoxide solvent, stir on a magnetic stirrer for 12 hours, and prepare a high-concentration solution of polyacrylonitrile with a mass fraction of 10 wt %;

Dissolve the dried polyvinylidene fluoride powder in N,N-dimethylformamide solvent, stir on a magnetic stirrer for 12 hours, and prepare a low-concentration polyvinylidene fluoride solution with a mass fraction of 6 wt %;

The third step: adopt an electrospinning device (CN104593880A) for mass production of polymer fibers, use a plurality of metal wires as the electrospinning nozzle, and use a polytetrafluoroethylene sheet to divide the liquid storage tank into four parts with the same length. Part, using a liquid supply device, so that one part of the liquid storage tank is filled with a 10wt% polyacrylonitrile high-concentration solution, and the other three parts are filled with a 6wt% polyvinylidene fluoride low-concentration solution, and the electrospinning and electrostatic spraying are synchronized. Combined with the technology, the nanofiber/microsphere composite membrane is prepared. Using spunbonded nonwoven fabric as the receiving substrate, the entire spinning process is carried out in a closed space, the spinning voltage is 55KV, the drum speed is 140r/min, the distance between the nozzle and the drum is 20cm, and the nozzle traverse speed is 60cm/min. The liquid speed is 30mL/h, the ambient temperature is 25°C, the ambient humidity is 40%, and the spinning time is 30min;

Step 4: Cover the upper surface of the nanofiber/spunbonded nonwoven material obtained in the third step with a layer of nonwoven fabric to form a sandwich structure in which the spunbonded nonwoven fabric and nanofibers are arranged alternately, and finally undergo ultrasonic bonding Finally, the electrospun nanofiber air filter material is obtained.

The filtration efficiency of the nanofiber air filter material to particles with a number median diameter of 75nm can reach 99.82%, and the filtration resistance is 95.1Pa.

Claims (10)

1. an efficient low-resistance electrostatic spinning nano fiber air filting material, it is characterised in that: described filtering material is spunbond non- Woven cloths and nanofiber sandwich alternately, nanofiber is electrostatic spinning nano fiber/microsphere composite membrane, Qi Zhongjing Electro spinning nano fiber/microsphere structure of composite membrane is: microsphere embeds the 3 D stereo cavity knot formed between electrostatic spinning nano fiber Structure.

A kind of efficient low-resistance electrostatic spinning nano fiber air filting material the most according to claim 1, it is characterised in that: institute Stating spun-bonded non-woven, fibre diameter is 1-10 μm, and grammes per square metre is 10-120g/m², exhibits initial filtration efficiency is 0.1%-5%.

A kind of efficient low-resistance electrostatic spinning nano fiber air filting material the most according to claim 1, it is characterised in that: institute State a diameter of 100-300nm of electrostatic spinning nano fiber；The particle diameter of microsphere is 500-800nm.

4. the mass system of the efficient low-resistance electrostatic spinning nano fiber air filting material as described in claim 1-3 is arbitrary Preparation Method, including:

(1) polymer is added in solvent, stirring, obtain the electrostatic spinning polymer solution of high concentration；Wherein electrostatic spinning gathers The mass percentage concentration of polymer solution is 10-40%；

(2) polymer is added in solvent, stirring, obtain the electrostatic spray polymer solution of low concentration；Wherein electrostatic spray gathers The mass percentage concentration of polymer solution is 3-30%；

(3) use needle-free electrostatic spinning nozzle, then by electrostatic spinning and electrostatic spray locking phase combination technology, prepare and receive Rice fiber/microsphere composite membrane, using rotate cylinder as receive device, spun-bonded non-woven for receive base material, obtain nanofiber/ Non-weaving cloth composite material；

(4) by above-mentioned nanofiber/non-weaving cloth composite material surface cover one layer spun-bonded non-woven, spun-bonded non-woven is formed With nanofiber sandwich alternately, then adhesion process, obtain electrostatic spinning nano fiber air filting material.

The mass preparation side of a kind of efficient low-resistance electrostatic spinning nano fiber air filting material the most according to claim 4 Method, it is characterised in that: in described step (1), (2) polymer be polyacrylonitrile, polyurethane, polysulfones, polyvinylpyrrolidone, In Kynoar, polyethylene glycol oxide, polystyrene, polymethyl methacrylate, polycaprolactone, polycaprolactam, chitosan One or more；Solvent is N,N-dimethylformamide, DMAC N,N' dimethyl acetamide, dimethyl sulfoxide, acetone, tetrahydrochysene furan Mutter, one or more in dichloromethane, chloroform, hexafluoroisopropanol, formic acid, acetic acid, ethanol.

The mass preparation side of a kind of efficient low-resistance electrostatic spinning nano fiber air filting material the most according to claim 4 Method, it is characterised in that: in described step (1), (2), stirring is magnetic agitation 10-12h.

The mass preparation side of a kind of efficient low-resistance electrostatic spinning nano fiber air filting material the most according to claim 4 Method, it is characterised in that: step (3) uses insulant, needle-free electrostatic spinning nozzle surface is divided into from center and has The 2-8 part of equal area or length, is injected into electrostatic spinning polymer solution and electrostatic spray polymer solution not respectively Same part, carries out spinning by electrostatic spinning and electrostatic spray locking phase combination technology.

The mass preparation side of a kind of efficient low-resistance electrostatic spinning nano fiber air filting material the most according to claim 7 Method, it is characterised in that: described insulant be politef, Kynoar, polymethyl methacrylate, Merlon, One in polyethylene, polypropylene, polystyrene.

The mass preparation side of a kind of efficient low-resistance electrostatic spinning nano fiber air filting material the most according to claim 4 Method, it is characterised in that: in described step (3), electrostatic spinning with the concrete technology parameter of electrostatic spray locking phase combination technology is: Spinning voltage 40-75KV, drum rotation speed 10-400r/min, shower nozzle and roller pitch are from 10-25cm, shower nozzle transverse moving speed 10- 300cm/min, liquid supply speed 20-500mL/h, ambient temperature 20-35 DEG C, ambient humidity 20-80%；Whole spinning-drawing machine is airtight, Being provided with temperature and humidity measure and device for automatically regulating in confined space, spinning nozzle is connected with transverse-moving mechanism, and spinning nozzle is with defeated Liquid pipe is connected, and the tube for transfusion other end connects liquid feed device, and in whole spinning process, liquid feed device supplies to shower nozzle sustainedly and stably Liquid, it is ensured that spinning is carried out continuously.

Prepared by the mass of a kind of efficient low-resistance electrostatic spinning nano fiber air filting material the most according to claim 4 Method, it is characterised in that: in described step (4), adhesion process is ultrasonic bonds.