Preparation method of superfine nanofiber antibacterial mosquito-repellent high-efficiency low-resistance air filtration membrane

Abstract

The application discloses a preparation method of superfine nanofiber antibacterial and mosquito-repellent high-efficiency low-resistance air filtration membrane, which comprises the following steps: dissolving cellulose acetate, cinnamyl aldehyde and polyhexamethylene biguanide hydrochloride in a solvent, fully stirring to form a spinning solution, wherein the solvent is a mixed solution of acetone, N, N-dimethylacetamide and water; and performing electrostatic spinning on the spinning solution to obtain the superfine nanofiber antibacterial and mosquito-repellent high-efficiency low-resistance air filtration membrane. The manufacturing steps of the application are simple and not complicated; cellulose acetate has excellent mechanical properties, hydrophobicity and thermal stability, and is an ideal material for air filtration membrane; the liquid property of cinnamyl aldehyde can effectively dilute cellulose acetate, so that the overall binding energy of the mixed solution system is reduced, the diameter of the prepared fiber is reduced, and meanwhile, the mild binding force of cinnamyl aldehyde minimally affects the interaction between cellulose acetate molecules.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of air filtration membranes, and in particular to a preparation method of an ultrafine nanofiber antibacterial mosquito-repelling high-efficiency low-resistance air filtration membrane. BACKGROUND

[0002] With the rapid development of the global economy, air pollution problems are becoming increasingly serious. Air filtration materials are an effective means to resist air particles, but single filtration capacity cannot meet the personal protection needs in multiple scenarios. The particles deposited on the air filter membrane often contain a large number of pathogenic bacteria, which are harmful to human health, and it is necessary to endow the air filter membrane with antibacterial capacity. In addition, there may be a threat from mosquitoes in hot environments, which seriously affects human comfort and safety. Therefore, mosquito-repelling antibacterial air filter membranes are expected to further protect human safety. Electrospun nanofiber membranes are widely used in the development of high-efficiency low-resistance air filter membranes due to their small fiber diameter, large specific surface area and high porosity.

[0003] The prior art CN112755651A discloses a multi-combination functional electrospun sub-micron fiber air filtration material and a preparation method thereof, which prepares three kinds of electrospinning solutions containing antibacterial agents and mosquito repellents with different concentrations, and prepares a three-dimensional gradient structure air filter membrane through alternating electrospinning by a needleless batch electrospinning device, which has antibacterial and mosquito-repelling effects. However, it needs to prepare multiple solutions, and relies on the alternating electrospinning of a special device to construct a multi-level structure, which is complicated, has low fault tolerance and many limitations, and is not conducive to popularization. Therefore, the preparation method based on the electrospinning of a mixed solution is expected to more conveniently and efficiently prepare multifunctional air filter membranes. SUMMARY

[0004] Therefore, it is necessary to provide a preparation method of an ultrafine nanofiber antibacterial mosquito-repelling high-efficiency low-resistance air filtration membrane to solve the problems that the prior art needs to prepare multiple solutions, relies on the alternating electrospinning of a special device to construct a multi-level structure, and is complicated, has low fault tolerance and many limitations.

[0005] To achieve the above-mentioned purpose, the application provides a preparation method of an ultrafine nanofiber antibacterial mosquito-repelling high-efficiency low-resistance air filtration membrane, which comprises the following steps:

[0006] Dissolve cellulose acetate, cinnamaldehyde and polyhexamethylene biguanide hydrochloride in a solvent, and fully stir to form a spinning solution, wherein the solvent is a mixed solution of acetone, N,N-dimethylacetamide and water;

[0007] Electrospinning the spinning solution to obtain an ultrafine nanofiber antibacterial mosquito-repelling high-efficiency low-resistance air filtration membrane.

[0008] Further, the volume ratio of acetone, N,N-dimethylacetamide and water in the solvent is 5-10:1-6:0.1-1.

[0009] Further, the mass ratio of the cellulose acetate, the cinnamaldehyde and the polyhexamethylene biguanide hydrochloride is 15-22:2-14:0.1-1.

[0010] Further, the volume ratio of the acetone, the N,N-dimethylacetamide and the water in the solvent is 6-9:1-4:0.1-0.5.

[0011] Further, the mass fraction of the spinning solution is 16-25%.

[0012] Further, the stirring time is 8-24h.

[0013] Further, the temperature of the electrospinning is 20-50℃, the humidity is 20-80%, the spinning voltage is 16-30kV, the receiving distance is 8-20cm, and the liquid supply rate is 0.05-0.5mL / h.

[0014] The above technical solution has the following beneficial effects:

[0015] (1) All components of the nanofiber membrane prepared in the application are selected from bio-based materials, which is expected to reduce energy consumption and environmental pollution. Cinnamaldehyde only contains carbonyl as a hydrogen bond acceptor, which is a low binding energy substance, while cellulose acetate contains hydroxyl as a hydrogen bond donor and acceptor, which has high binding energy. Cellulose acetate has excellent mechanical properties, hydrophobicity and thermal stability, and is an ideal material for air filtration membranes; the liquid properties of cinnamaldehyde can effectively dilute cellulose acetate, so that the overall binding energy of the mixed solution system is reduced, and the diameter of the prepared fiber is reduced. At the same time, the mild binding force of cinnamaldehyde minimally affects the interaction between cellulose acetate molecules, maximizing the retention of the mechanical properties, thermal stability and hydrophobicity of cellulose acetate; further, the addition of a small amount of polyhexamethylene biguanide hydrochloride can ionize a large number of cations, greatly increasing the solution conductivity, thereby enhancing the jet splitting, sharply reducing the fiber diameter, and a large number of extremely fine nanofibers with a diameter less than 30nm appear, which is beneficial to realize high-efficiency and low-resistance air filtration.

[0016] (2) Single antibacterial agent often has the problems of narrow antibacterial spectrum and weak antibacterial effect. Cinnamaldehyde increases the permeability of bacterial cell membranes, leading to cell death, and a large number of cations contained in polyhexamethylene biguanide hydrochloride interact with anionic phospholipids in the bacterial cell wall, leading to cell wall rupture and death. The different antibacterial mechanisms of cinnamaldehyde and polyhexamethylene biguanide hydrochloride enable them to achieve synergistic antibacterial effect and greatly enhance the antibacterial ability.

[0017] (3) The excellent mosquito-repelling effect of cinnamaldehyde is due to the neurotoxicity of its lipophilic benzene ring to mosquitoes, and the volatility of cinnamaldehyde enables it to contact mosquitoes when released through the air, achieving good mosquito-repelling effect. In addition, the hydrogen bond between cellulose acetate and cinnamaldehyde enables cinnamaldehyde to be effectively bound, achieving an encapsulation rate of cinnamaldehyde of more than 50%, giving cinnamaldehyde a slow-release ability, enabling long-acting mosquito-repelling and antibacterial for more than 2 weeks.

[0018] (4) The superfine nanofiber antibacterial mosquito-repelling high-efficiency low-resistance air filtration membrane is prepared by one-step electrospinning of a blended polymer solution, effectively avoiding nanotoxicity, improving preparation efficiency, and reducing the preparation threshold, which will greatly promote the batch preparation and promote commercial application. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 The figure is a schematic diagram of the preparation process of the superfine nanofiber antibacterial mosquito-repelling high-efficiency low-resistance air filtration membrane.

[0020] Figure 2 The figure is a flow chart of the preparation process of the superfine nanofiber antibacterial mosquito-repelling high-efficiency low-resistance air filtration membrane.

[0021] Figure 3 The figure is a scanning electron microscope photo of the superfine nanofiber antibacterial mosquito-repelling high-efficiency low-resistance air filtration membrane.

[0022] Figure 4 The figure is a scanning electron microscope photo of the nanofiber membrane prepared by the strong binding force electrospinning system containing eugenol.

[0023] Figure 5 The figure is the tensile strength of the superfine nanofiber antibacterial mosquito-repelling high-efficiency low-resistance air filtration membrane and the nanofiber membrane prepared by the strong binding force electrospinning system containing eugenol.

[0024] Figure 6 The figure is the melting point of the superfine nanofiber antibacterial mosquito-repelling high-efficiency low-resistance air filtration membrane and the nanofiber membrane prepared by the strong binding force electrospinning system containing eugenol.

[0025] Figure 7 The figure is the water contact angle of the superfine nanofiber antibacterial mosquito-repelling high-efficiency low-resistance air filtration membrane and the nanofiber membrane prepared by the strong binding force electrospinning system containing eugenol. DETAILED DESCRIPTION

[0026] In order to make the technical content, structural features, purposes and effects of the technical scheme clear, the following will be described in detail in combination with specific embodiments and the accompanying drawings.

[0027] Please refer to Figures 1 to 7 The embodiment provides a preparation method of a superfine nanofiber antibacterial mosquito-repelling high-efficiency low-resistance air filtration membrane, which comprises the following steps:

[0028] (1) Cellulose acetate, cinnamaldehyde and polyhexamethylene biguanide hydrochloride are dissolved in a solvent, stirred thoroughly to form a spinning solution, and the solvent is a mixed solution of acetone, N, N-dimethylacetamide and water;

[0029] (2) The spinning solution obtained in (1) is electrospun to obtain an ultrafine nanofiber antibacterial and mosquito-repellent high-efficiency low-resistance air filtration membrane with stable structure and performance.

[0030] The flow of the preparation process is shown in Figure 1 and Figure 2 During the electrospinning process of the spinning solution, splitting of the electrospinning jet occurs to obtain a double-mode nanofiber layer with a large number of extremely fine nanofibers and coarse nanofibers interwoven, as shown in Figure 3 The average diameter of the fibers is 59 nm, and the average diameter of the extremely fine fibers is 15 nm, with a coverage rate of 100%.

[0031] The above technical solution has the following beneficial effects:

[0032] (1) All components of the nanofiber membrane prepared in the present application are selected from bio-based materials, which is expected to reduce energy consumption and environmental pollution. Cinnamaldehyde only contains carbonyl as a hydrogen bond acceptor, which is a low-binding-energy substance, while cellulose acetate contains hydroxyl as a hydrogen bond donor and acceptor, which has high binding energy. Cellulose acetate has excellent mechanical properties, hydrophobicity and thermal stability, and is an ideal material for air filtration membranes; the liquid properties of cinnamaldehyde can effectively dilute cellulose acetate, so that the overall binding energy of the mixed solution system is reduced, and the diameter of the prepared fibers is reduced. At the same time, the mild binding force of cinnamaldehyde minimally affects the interaction between cellulose acetate molecules, maximizing the retention of the mechanical properties, thermal stability and hydrophobicity of cellulose acetate; further addition of a small amount of polyhexamethylene biguanide hydrochloride can ionize a large number of cations, greatly increasing the solution conductivity, thereby enhancing the splitting of the jet, sharply reducing the fiber diameter, and a large number of extremely fine nanofibers with a diameter of less than 30 nm appear, which is beneficial to achieving high-efficiency low-resistance air filtration.

[0033] (2) Single antibacterial agent often has the problems of narrow antibacterial spectrum and weak antibacterial effect. Cinnamaldehyde increases the permeability of bacterial cell membranes, leading to their death, and the interaction between the large number of cations contained in polyhexamethylene biguanide hydrochloride and the anionic phospholipids in the bacterial cell wall leads to the rupture of the cell wall and death. The different antibacterial mechanisms of cinnamaldehyde and polyhexamethylene biguanide hydrochloride enable them to achieve synergistic antibacterial effect and greatly enhance the antibacterial ability.

[0034] (3) The excellent mosquito-repelling effect of cinnamyl aldehyde is due to the neurotoxicity of its lipophilic benzene ring to mosquitoes, and the volatility of cinnamyl aldehyde enables it to contact mosquitoes when released through the air, achieving good mosquito-repelling effect. In addition, the hydrogen bond between cellulose acetate and cinnamyl aldehyde enables cinnamyl aldehyde to be effectively bound, achieving an encapsulation rate of cinnamyl aldehyde of more than 50%, giving cinnamyl aldehyde a slow-release ability, enabling long-acting mosquito-repelling and antibacterial for more than 2 weeks.

[0035] (4) The superfine nanofiber antibacterial mosquito-repelling high-efficiency low-resistance air filtration membrane is prepared by one-step electrospinning of a blended polymer solution, effectively avoiding nanotoxicity, improving preparation efficiency, and reducing the preparation threshold, which will greatly promote the batch preparation and promote commercial application.

[0036] According to a preferred embodiment of the present application, the volume ratio of acetone, N,N-dimethylacetamide and water in the solvent is 5-10:1-6:0.1-1.

[0037] According to a preferred embodiment of the present application, the mass ratio of cellulose acetate, cinnamyl aldehyde and polyhexamethylene biguanide hydrochloride is 15-22:2-14:0.1-1.

[0038] According to a preferred embodiment of the present application, the volume ratio of acetone, N,N-dimethylacetamide and water in the solvent is 6-9:1-4:0.1-0.5.

[0039] According to a preferred embodiment of the present application, the mass fraction of the spinning solution is 16-25%.

[0040] According to a preferred embodiment of the present application, the stirring time is 8-24h.

[0041] According to a preferred embodiment of the present application, the electrospinning temperature is 20-50℃, the humidity is 20-80%, the spinning voltage is 16-30kV, the receiving distance is 8-20cm, and the liquid supply rate is 0.05-0.5mL / h.

[0042] The specific embodiments of the present application are as follows:

[0043] Example 1

[0044] 6.3g of acetone, 1.9g of N,N-dimethylacetamide and 0.2g of water were taken to prepare a compound organic solvent with a volume ratio of 8 / 2 / 0.2 at room temperature. 1.663g of cellulose acetate, 0.416g of cinnamyl aldehyde and 0.021g of polyhexamethylene biguanide hydrochloride were weighed according to a mass concentration of 20wt%, and then added to the compound organic solvent. A magnetic stirrer was used for continuous stirring for 12h until complete dissolution, to obtain a cellulose acetate, cinnamyl aldehyde and polyhexamethylene biguanide hydrochloride blended spinning solution with a mass ratio of 16 / 4 / 0.2.

[0045] The electrospinning is carried out under the conditions of temperature 24℃, humidity 50%, spinning voltage 24kV, receiving distance 12cm, and liquid supply rate 0.15mL / h, so that the superfine nanofiber antibacterial and mosquito-repelling high-efficiency low-resistance air filtration membrane is obtained.

[0046] Example 2

[0047] The 6.3g of acetone, 1.9g of N,N dimethylacetamide and 0.2g of water are prepared into a compound organic solvent with a volume ratio of 8 / 2 / 0.2 at room temperature. 1.397g of cellulose acetate, 0.419g of cinnamaldehyde and 0.028g of polyhexamethylene biguanide hydrochloride are respectively weighed according to the mass concentration of 18wt%, and then added into the compound organic solvent. The magnetic stirrer is continuously stirred for 10h until fully dissolved, so that a cellulose acetate, cinnamaldehyde and polyhexamethylene biguanide hydrochloride blending spinning solution with a mass ratio of 20 / 6 / 0.4 is obtained.

[0048] The electrospinning is carried out under the conditions of temperature 30℃, humidity 65%, spinning voltage 22kV, receiving distance 10cm, and liquid supply rate 0.3mL / h, so that the superfine nanofiber antibacterial and mosquito-repelling high-efficiency low-resistance air filtration membrane is obtained.

[0049] Example 3

[0050] The 5.5g of acetone, 2.8g of N,N dimethylacetamide and 0.3g of water are prepared into a compound organic solvent with a volume ratio of 7 / 3 / 0.3 at room temperature. 1.375g of cellulose acetate, 0.859g of cinnamaldehyde and 0.052g of polyhexamethylene biguanide hydrochloride are respectively weighed according to the mass concentration of 21wt%, and then added into the compound organic solvent. The magnetic stirrer is continuously stirred for 15h until fully dissolved, so that a cellulose acetate, cinnamaldehyde and polyhexamethylene biguanide hydrochloride blending spinning solution with a mass ratio of 16 / 10 / 0.6 is obtained.

[0051] The electrospinning is carried out under the conditions of temperature 40℃, humidity 35%, spinning voltage 18kV, receiving distance 12cm, and liquid supply rate 0.2mL / h, so that the superfine nanofiber antibacterial and mosquito-repelling high-efficiency low-resistance air filtration membrane is obtained.

[0052] Example 4

[0053] The 5.5g of acetone, 2.8g of N,N dimethylacetamide and 0.3g of water are prepared into a compound organic solvent with a volume ratio of 7 / 3 / 0.3 at room temperature. 1.441g of cellulose acetate, 0.549g of cinnamaldehyde and 0.027g of polyhexamethylene biguanide hydrochloride are respectively weighed according to the mass concentration of 19wt%, and then added into the compound organic solvent. The magnetic stirrer is continuously stirred for 17h until fully dissolved, so that a cellulose acetate, cinnamaldehyde and polyhexamethylene biguanide hydrochloride blending spinning solution with a mass ratio of 21 / 8 / 0.4 is obtained.

[0054] The electrospinning is carried out under the conditions of temperature 35℃, humidity 65%, spinning voltage 28kV, receiving distance 15cm, and liquid supply rate 0.4mL / h, so that the superfine nanofiber antibacterial and mosquito-repelling high-efficiency low-resistance air filtration membrane is obtained.

[0055] Example 5

[0056] The 4.7g of acetone, 3.7g of N,N-dimethylacetamide and 0.4g of water are prepared into a compound organic solvent with a volume ratio of 6 / 4 / 0.4 at room temperature. 1.854g of cellulose acetate, 1.011g of cinnamaldehyde and 0.067g of polyhexamethylene biguanide hydrochloride are weighed according to the mass concentration of 25wt% and added into the compound organic solvent respectively, and continuously stirred by a magnetic stirrer for 17h until fully dissolved, so as to obtain a cellulose acetate, cinnamaldehyde and polyhexamethylene biguanide hydrochloride blending spinning solution with a mass ratio of 22 / 12 / 0.8.

[0057] The electrospinning is carried out under the conditions of temperature 30℃, humidity 60%, spinning voltage 27kV, receiving distance 13cm, and liquid supply rate 0.2mL / h, so that the superfine nanofiber antibacterial and mosquito-repelling high-efficiency low-resistance air filtration membrane is obtained.

[0058] Example 6

[0059] The 4.7g of acetone, 3.7g of N,N-dimethylacetamide and 0.4g of water are prepared into a compound organic solvent with a volume ratio of 6 / 4 / 0.4 at room temperature. 1.854g of cellulose acetate, 1.011g of cinnamaldehyde and 0.067g of polyhexamethylene biguanide hydrochloride are weighed according to the mass concentration of 25wt% and added into the compound organic solvent respectively, and continuously stirred by a magnetic stirrer for 17h until fully dissolved, so as to obtain a cellulose acetate, cinnamaldehyde and polyhexamethylene biguanide hydrochloride blending spinning solution with a mass ratio of 22 / 12 / 0.8.

[0060] The electrospinning is carried out under the conditions of temperature 40℃, humidity 75%, spinning voltage 30kV, receiving distance 19cm, and liquid supply rate 0.5mL / h, so that the superfine nanofiber antibacterial and mosquito-repelling high-efficiency low-resistance air filtration membrane is obtained.

[0061] Since cinnamaldehyde has a certain volatility, the initial performance and the performance after standing for 14 days of the air filtration membranes prepared in Examples 1-6 were tested to verify the persistence of the effect. The air filtration membranes prepared in Examples 1-6 were tested for air filtration performance using 300 nm diameter sodium chloride aerosol particles, and the filtration efficiency thereof reached more than 99% at a test flow rate of 32 L / min, and the resistance pressure drop was not more than 60 Pa. The antibacterial performance of the air filtration membranes prepared in Examples 1-6 was tested according to GB / T 20944.3-2008, and the initial antibacterial rate and the antibacterial rate after standing for 14 days of Escherichia coli and Staphylococcus aureus were not less than 99%. The mosquito repellent performance of the air filtration membranes prepared in Examples 1-6 was tested according to the repellency test method in GB / T 30126, and the mosquito species used was Aedes albopictus. When the repellency rate is > 70%, it belongs to the best A level of mosquito repellent effect. The initial performance test results are shown in Table 1, and the performance test results after standing for 14 days are shown in Table 2.

[0062] Table 1 Initial performance of the superfine nanofiber antibacterial and mosquito repellent air filtration membranes prepared in Examples 1-6

[0063]

[0064] Table 2 Performance of the superfine nanofiber antibacterial and mosquito repellent air filtration membranes prepared in Examples 1-6 after standing for 14 days

[0065]

[0066] As can be seen from Table 1, the superfine nanofiber antibacterial and mosquito repellent high-efficiency low-resistance air filtration membranes prepared by the method of the application have excellent antibacterial ability, mosquito repellent effect, high-efficiency low-resistance air filtration performance, and have more than 99% filtration efficiency for 300 nm sodium chloride particles under the condition of a pressure drop of less than 60 Pa, and the bactericidal rate for Escherichia coli and Staphylococcus aureus is more than 99%, and the mosquito repellency rate is more than 90%, far exceeding the threshold value (70%) of the A level standard. As can be seen from Table 2, the superfine nanofiber antibacterial and mosquito repellent high-efficiency low-resistance air filtration membranes prepared by the method of the application have good persistent antibacterial, mosquito repellent and high-efficiency low-resistance air filtration ability, and even after standing for 14 days, they still have more than 99% filtration efficiency for 300 nm sodium chloride particles under the condition of a pressure drop of less than 60 Pa, and maintain more than 99% bactericidal rate and more than 70% mosquito repellency rate, meeting the A level mosquito repellent standard. In addition, the air filtration membranes all use bio-based materials, which can reduce energy consumption and environmental burden, and at the same time, effectively avoid nanotoxicity during use, and meet the safety requirements of personal protection.

[0067] Further in order to prove that the air filter membrane prepared by the present application introduces the cinnamaldehyde with mild binding force to enhance the voltage response and reduce the damage to the original system performance, two kinds of electrospinning systems with mild binding force and strong binding force are constructed, wherein the mild binding force electrospinning system is composed of cellulose acetate, cinnamaldehyde and polyhexamethylene biguanide hydrochloride, and the mass ratio is 20 / 6 / 0.4; the strong binding force system is composed of cellulose acetate, eugenol and polyhexamethylene biguanide hydrochloride, and the mass ratio is 20 / 6 / 0.4.

[0068] Cinnamaldehyde contains a large number of hydroxyl groups, which are only hydrogen bond acceptors, and has low binding energy. At the same time, the liquid dilution effect reduces the binding energy of the solution system, so it has a strong response to the voltage, the jet splitting is enhanced, and the fiber is finer (see Figure 3 ). Under the same conditions, eugenol contains more hydroxyl groups, which are hydrogen bond donors and acceptors, and has higher binding energy. Even if there is liquid dilution effect, it cannot offset the negative impact brought by the presence of hydroxyl groups, so the voltage response is weaker, the electrospinning jet stretching is inhibited, and the fiber diameter increases significantly (see Figure 4 ).

[0069] The tensile strength (see Figure 5 ), melting point (see Figure 6 ), and water contact angle (see Figure 7 ) of the superfine nanofiber antibacterial mosquito-repellent high-efficiency low-resistance air filter membrane containing cinnamaldehyde are 2.35 MPa, 224℃, and 110°, respectively, which are higher than those of the nanofiber membrane prepared by the strong binding force electrospinning system containing eugenol (1.93 MPa, 195℃, 0°), proving that cinnamaldehyde has less impact on the original cellulose acetate system, while eugenol has too strong binding force, which destroys the interaction between cellulose acetate molecules, and seriously damages the performance of the fiber.

[0070] It should be noted that in this paper, relational terms such as first and second are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or terminal device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or terminal device. Without more limitations, the elements defined by the statement "include" or "contain" do not exclude the presence of other elements in the process, method, article or terminal device including the elements. In addition, in this paper, "greater than", "less than", "exceed" and the like are understood as not including the number; "above", "below", "within" and the like are understood as including the number.

[0071] Although the above-mentioned embodiments have been described, those skilled in the art can make further changes and modifications to the embodiments once they know the basic inventive concept, and therefore the above-mentioned embodiments are only examples of the present application, and are not intended to limit the patent protection scope of the present application, and any equivalent structure or equivalent process transformation made by using the content of the present application specification and drawings, or directly or indirectly applied to other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A method for preparing an ultra-fine nanofiber antibacterial mosquito-repellent high-efficiency low-resistance air filtration membrane, characterized in that, The method comprises the following steps: Dissolving cellulose acetate, cinnamaldehyde and polyhexamethylene biguanide hydrochloride in a solvent, fully stirring to form a spinning solution, the solvent is a mixed solution of acetone, N, N-dimethylacetamide and water, the mass ratio of the cellulose acetate, the cinnamaldehyde and the polyhexamethylene biguanide hydrochloride is 15-22:2-14:0.1-1; Carrying out electrostatic spinning on the spinning solution to obtain superfine nanofiber antibacterial and mosquito-repellent high-efficiency low-resistance air filtration membrane.

2. The production method according to claim 1, characterized by, The volume ratio of acetone, N, N-dimethylacetamide and water in the solvent is 5-10:1-6:0.1-1.

3. The preparation method according to claim 1, characterized in that, The volume ratio of acetone, N, N-dimethylacetamide and water in the solvent is 6-9:1-4:0.1-0.

5.

4. The production method according to claim 1, characterized by, The mass fraction of the spinning solution is 16-25%.

5. The preparation method according to claim 1, characterized in that, The stirring time is 8-24h.

6. The method of claim 1, wherein, The temperature of the electrostatic spinning is 20-50℃, the humidity is 20-80%, the spinning voltage is 16-30kV, the receiving distance is 8-20cm, and the liquid supply rate is 0.05-0.5mL / h.

Images