Green ecological bacteriostatic composite protective mask

Abstract

The invention discloses a green ecological bacteriostatic composite protective mask in the technical field of protective masks, which comprises an external protective layer, one side of the external protective layer is fixedly connected with a middle sterilizing layer, and one side of the middle sterilizing layer far away from the external protective layer is fixedly connected with an internal skin-friendly layer. The invention provides an efficient antibacterial layer with triple antibacterial effects. Guanidine salt and 1-O-acetyl inula flower lactone containing a sesquiterpene lactone structure are grafted on hydroxy propyl cellulose; sesquiterpene lactone destroys bacterial cell walls and generates bactericidal active oxygen, guanidyl enhances the capacity of capturing bacteria through electrostatic attraction, and the sesquiterpene lactone and guanidyl act together to disturb cell membrane structures and cause cell death; the protective mask can sterilize for a long time, the replacement frequency is reduced, the sesquiterpene lactone can reduce peculiar smell and diminish inflammation, and the comfort level of a user is enhanced; the protection function of the outer layer is enhanced through fat-soluble protein modified polylactic acid, and the structural stability is improved; all the used base materials are green and degradable, and the environmental protection property is excellent.

Description

Technical Field

[0001] This invention belongs to the field of protective mask technology, and in particular relates to a green, eco-friendly, antibacterial composite protective mask. Background Technology

[0002] Composite protective masks are multi-layered masks designed to provide superior air filtration efficiency and ensure wearer comfort. Their complex structure comprises multiple functional layers to effectively filter fine particles, helping to prevent the spread of various respiratory pathogens. Composite masks effectively isolate airborne viral aerosols and virus-laden droplets, maintaining their barrier properties even under respiratory airflow. Furthermore, their design ensures that the outer surface does not come into contact with the skin when removing the mask, reducing the risk of cross-contamination. These masks effectively filter and intercept airborne particles, including droplets, blood, bodily fluids, and secretions, providing comprehensive protection for the user.

[0003] While existing composite protective masks offer the aforementioned performance advantages, they also face some limitations. Some of these issues include limited functionality; while effectively blocking particulate matter, they are limited in their ability to inhibit bacterial growth and cannot provide long-term microbial protection. Another key concern is environmental friendliness. Because some masks use non-biodegradable materials, they are detrimental to environmental protection. These disposable products can put pressure on the environment after disposal, and the resulting waste is difficult to manage, hindering green practices. Summary of the Invention

[0004] To address the above issues and overcome the shortcomings of existing technologies, this invention provides a green, eco-friendly, antibacterial composite protective mask. To resolve the deficiencies in antibacterial efficacy, functionality, and environmental friendliness of existing composite protective masks, this invention uses green, biodegradable materials as the base material and modifies the outer protective layer and the middle sterilization layer, resulting in a green, eco-friendly, antibacterial composite protective mask with long-lasting antibacterial properties.

[0005] To achieve the above objectives, the following technical solution is adopted: This invention provides a green, eco-friendly, antibacterial composite protective mask, comprising an outer protective layer, a middle sterilization layer fixedly connected to one side of the outer protective layer, an inner skin-friendly layer fixedly connected to the side of the middle sterilization layer away from the outer protective layer, elastic bands fixedly connected to both sides of the side of the inner skin-friendly layer away from the middle sterilization layer, and an adjustable nose bridge strip fixedly connected to the upper part of the side of the outer protective layer away from the middle sterilization layer.

[0006] Furthermore, the protective mask is prepared through the following steps:

[0007] S1. Preparation of the middle sterilization layer: 1.5-5 parts of guanidine salt, 0.5-2.5 parts of 1-O-acetyl inula lactone, 5-10 parts of diamine monomer and 100-150 parts of acetone are added to a reaction vessel and heated to reflux under a nitrogen atmosphere for 1.5-3 hours to obtain a solution of guanidine-containing sesquiterpene lactone compound. Then, 80-120 parts of hydroxypropyl cellulose and 0.1-1 parts of silver nitrate solution are added to the solution, stirred for 2-4 hours, and allowed to stand for 12-24 hours. The solution is then electrospun using an electrospinning device. The electrospun cellulose fibers are collected through a collecting plate and cut to obtain the middle sterilization layer.

[0008] S2. Preparation of the outer protective layer: Dissolve the liposoluble protein in 100-150 parts of ethyl acetate and stir at 100-120℃ for 0.5-1h. Then add 80-120 parts of polylactic acid, 10-15 parts of mineral powder, 10-20 parts of crosslinking agent, 5-8 parts of coupling agent, and 0.5-2 parts of emulsifier. Stir for 1.5-3h to obtain the spinning solution. Then perform wet spinning. After coagulation, washing, drying at 80-120℃, and cutting, the outer protective layer is obtained.

[0009] S3. Mask assembly: Using polylactic acid nonwoven fabric as the inner skin-friendly layer, the outer protective layer, the middle sterilization layer, and the inner skin-friendly layer are stacked in sequence and formed by hot pressing. Adjustable nose bridge strips and elastic bands are respectively set on the outer protective layer and the inner skin-friendly layer to obtain the protective mask.

[0010] Further, the guanidine salt is one of 1,1-dimethylbiguanidine, tetramethylguanidine hydrochloride, 2-n-butyl-1,1,3,3-tetramethylguanidine, 1-cyclopropyl-1-methylguanidine hydrochloride, and N-(6-(3-methylguanidinyl)hexyl)acetylimine.

[0011] Furthermore, the diamine monomer is one of triethylenediamine, tetraethylenediamine, oxaloyldiamine, hexamethylenediamine, 1,4-butanediamine dihydrochloride, 1,5-pentanediamine hydrochloride, and 1,8-octanediamine.

[0012] Furthermore, the molecular weight of the hydroxypropyl cellulose is 50,000-10,000.

[0013] Furthermore, the concentration of the silver nitrate solution is 1.0-3.5 wt%.

[0014] Furthermore, the molecular weight of the polylactic acid is 100,000-2,000,000.

[0015] Further, the crosslinking agent is one of 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide, N-hydroxysuccinimide, and 1,4-butanedialdehyde glycidyl ether.

[0016] Furthermore, the crosslinking agent is one of KH550, KH570, KH670, and KH790.

[0017] Furthermore, the emulsifier is a combination of one of Span20, Span60, and Span80 and one of Tween40, Tween60, and Tween85.

[0018] Furthermore, the mineral powder is one of zeolite powder, hydromagnetite powder, and montmorillonite.

[0019] Furthermore, the temperature of the hot-press bonding is 160-180℃.

[0020] The beneficial effects of this invention are:

[0021] (1) This invention provides a highly efficient antibacterial layer with multiple biological functions by compounding guanidine salt and 1-O-acetyl inula lactone containing sesquiterpene lactone structure and grafting it onto hydroxypropyl cellulose. Sesquiterpene lactone can not only destroy the cell wall of bacteria, but also interact with anions to generate active oxygen with bactericidal effect, further inhibiting the growth and metabolism of bacteria, leading to dysfunction and even death. Guanido group, as a group with a strong positive charge, can effectively adsorb the negatively charged part of the bacterial surface. Through this electrostatic attraction, the material's ability to capture bacteria is enhanced. In addition, sesquiterpene lactone and guanido group interact with phospholipids in bacterial cell membrane, disrupting the structural integrity of the cell membrane and causing leakage of important substances in the cell. This material can also form a stable coordination complex with silver ions, promoting the uniform distribution of anions. Thus, the middle sterilization layer exhibits excellent triple antibacterial effect under the action of anions, guanido group and sesquiterpene lactone, with long-lasting sterilization ability, greatly reducing the frequency of replacement of protective products by consumers.

[0022] (2) Sesquiterpene lactones have a natural fragrance. While inhibiting bacteria, they can reduce the odor produced by the mask during use. Sesquiterpene lactones have anti-inflammatory properties, which help eliminate skin inflammation in users. They are skin-friendly and reduce the risk of discomfort and cross-infection caused by allergic reactions in users.

[0023] (3) This invention modifies polylactic acid by using fat-soluble protein to make the outer protective layer water-repellent, blood-proof, and saliva-proof. The fat-soluble protein and mineral powder polylactic acid form a cross-linked structure, which enhances the structural stability of the mask and increases the surface area of ​​polylactic acid, allowing it to fully contact dust and bacteria and block, capture, and adsorb them.

[0024] (4) The basic materials used in this invention are hydroxypropyl cellulose, polylactic acid, and liposoluble protein, which are green and biodegradable materials with the advantages of being green and environmentally friendly. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of a green, eco-friendly, antibacterial composite protective mask according to the present invention;

[0026] Figure 2 The static water contact angle test results of the outer protective layer of the green ecological antibacterial composite protective mask of the present invention are shown in various embodiments and comparative examples.

[0027] Figure 3 The test results of bacterial filtration efficiency of various embodiments and comparative examples of the green ecological antibacterial composite protective mask of the present invention are shown.

[0028] Figure 4 The test results show the antibacterial rate of the green eco-friendly antibacterial composite protective mask of the present invention.

[0029] Legend: 1. Outer protective layer; 2. Middle sterilization layer; 3. Inner skin-friendly layer; 4. Elastic band; 5. Adjustable nose bridge strip.

[0030] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof. Detailed Implementation

[0031] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those familiar to those skilled in the art. Furthermore, any methods and materials similar to or equivalent to those described herein may be applied to this invention. The preferred embodiments and materials described herein are for illustrative purposes only and do not limit the scope of this application.

[0033] Unless otherwise specified, the experimental methods used in the following examples are conventional methods, and the experimental materials used in the following examples are all purchased from commercial channels.

[0034] Example 1

[0035] A green, eco-friendly, antibacterial composite protective mask

[0036] The protective mask includes an outer protective layer 1, which is water-repellent and can block and absorb dust and bacteria. A middle sterilization layer 2 is fixedly connected to one side of the outer protective layer 1. The middle sterilization layer 2 is used to kill bacteria. An inner skin-friendly layer 3 is fixedly connected to the side of the middle sterilization layer 2 away from the outer protective layer 1. The inner skin-friendly layer 3 is in direct contact with the user's face. Elastic bands 4 are fixedly connected to both sides of the side of the inner skin-friendly layer 3 away from the middle sterilization layer 2. The elastic bands 4 are used to hang on the ears when the user wears the mask. An adjustable nose bridge strip 5 is fixedly connected to the upper part of the side of the outer protective layer 1 away from the middle sterilization layer 2. The adjustable nose bridge strip 5 can be adjusted according to different users' faces so that the mask fits the user's face and covers the user's mouth and nose.

[0037] The protective mask is prepared through the following steps:

[0038] S1. Preparation of the middle sterilization layer: 1.5 parts of guanidine salt, 0.5 parts of 1-O-acetyl inula lactone, 5 parts of diamine monomer and 100 parts of acetone were added to a reaction vessel and heated to reflux under a nitrogen atmosphere for 1.5 h to obtain a solution of guanidine-containing sesquiterpene lactone compound. Then, 80 parts of hydroxypropyl cellulose and 0.1 parts of silver nitrate solution were added to the solution, stirred for 2 h, and allowed to stand for 12 h. The solution was then electrospinned using an electrospinning device. Cellulose electrospun fibers were collected through a collecting plate and cut to obtain the middle sterilization layer.

[0039] S2. Preparation of the outer protective layer: The liposoluble protein is dissolved in 100 parts of ethyl acetate and stirred at 100°C for 0.5 h. Then, 80 parts of polylactic acid, 10 parts of mineral powder, 10 parts of crosslinking agent, 5 parts of coupling agent, and 0.5 parts of emulsifier are added and stirred for 1.5 h to obtain the spinning solution. Then, wet spinning is performed. After coagulation, washing, drying at 80°C, and cutting, the outer protective layer is obtained.

[0040] S3. Mask assembly: Using polylactic acid nonwoven fabric as the inner skin-friendly layer, the outer protective layer, the middle sterilization layer, and the inner skin-friendly layer are stacked in sequence and formed by hot pressing. Adjustable nose bridge strips and elastic bands are respectively set on the outer protective layer and the inner skin-friendly layer to obtain the protective mask.

[0041] The guanidine salt is 1,1-dimethylbiguanide.

[0042] The diamine monomer is triethylenediamine.

[0043] The molecular weight of the hydroxypropyl cellulose is 50,000-10,000.

[0044] The concentration of the silver nitrate solution is 1.0 wt%.

[0045] The molecular weight of the polylactic acid is 100,000-2,000,000.

[0046] The crosslinking agent is 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide.

[0047] The crosslinking agent is KH550.

[0048] The emulsifier is a combination of Span20 and Tween40 in a mass ratio of 4:1.

[0049] The mineral powder is zeolite powder.

[0050] The temperature for hot-press bonding is 160°C.

[0051] Example 2

[0052] A green, eco-friendly, antibacterial composite protective mask

[0053] The protective mask is prepared through the following steps:

[0054] S1. Preparation of the middle sterilization layer: 5 parts of guanidine salt, 2.5 parts of 1-O-acetyl inula lactone, 10 parts of diamine monomer and 150 parts of acetone were added to a reaction vessel and heated to reflux under a nitrogen atmosphere for 3 hours to obtain a solution of guanidine-containing sesquiterpene lactone compound. Then, 120 parts of hydroxypropyl cellulose and 1 part of silver nitrate solution were added to the solution, stirred for 4 hours, and allowed to stand for 24 hours. The solution was then added to an electrospinning device for electrospinning. The cellulose electrospun fibers were collected through a collecting plate and cut to obtain the middle sterilization layer.

[0055] S2. Preparation of the outer protective layer: The liposoluble protein is dissolved in 150 parts of ethyl acetate and stirred at 120°C for 1 hour. Then, 120 parts of polylactic acid, 15 parts of mineral powder, 20 parts of crosslinking agent, 8 parts of coupling agent, and 2 parts of emulsifier are added and stirred for 3 hours to obtain the spinning solution. Then, wet spinning is performed. After coagulation, washing, drying at 120°C, and cutting, the outer protective layer is obtained.

[0056] S3. Mask assembly: Using polylactic acid nonwoven fabric as the inner skin-friendly layer, the outer protective layer, the middle sterilization layer, and the inner skin-friendly layer are stacked in sequence and formed by hot pressing. Adjustable nose bridge strips and elastic bands are respectively set on the outer protective layer and the inner skin-friendly layer to obtain the protective mask.

[0057] The guanidine salt is tetramethylguanidine hydrochloride.

[0058] The diamine monomer is oxaloyldiamine.

[0059] The molecular weight of the hydroxypropyl cellulose is 50,000-10,000.

[0060] The concentration of the silver nitrate solution is 3.5 wt%.

[0061] The molecular weight of the polylactic acid is 100,000-2,000,000.

[0062] The crosslinking agent is N-hydroxysuccinimide.

[0063] The crosslinking agent is KH570.

[0064] The emulsifier is a combination of Span60 and Tween60 in a mass ratio of 3:1.

[0065] The mineral powder is hydropyrite powder.

[0066] The temperature for hot pressing is 180°C.

[0067] Example 3

[0068] A green, eco-friendly, antibacterial composite protective mask

[0069] The protective mask is prepared through the following steps:

[0070] S1. Preparation of the middle sterilization layer: 3.5 parts of guanidine salt, 1.5 parts of 1-O-acetyl inula lactone, 7.5 parts of diamine monomer and 120 parts of acetone were added to a reaction vessel and heated to reflux under a nitrogen atmosphere for 2.5 h to obtain a solution of guanidine-containing sesquiterpene lactone compound. Then, 100 parts of hydroxypropyl cellulose and 0.65 parts of silver nitrate solution were added to the solution, stirred for 3 h, and allowed to stand for 16 h. The solution was then electrospinned using an electrospinning device. Cellulose electrospun fibers were collected through a collecting plate and cut to obtain the middle sterilization layer.

[0071] S2. Preparation of the outer protective layer: The liposoluble protein was dissolved in 120 parts of ethyl acetate and stirred at 110°C for 0.6 h. Then, 115 parts of polylactic acid, 13.5 parts of mineral powder, 14 parts of crosslinking agent, 7 parts of coupling agent, and 1.25 parts of emulsifier were added and stirred for 2.5 h to obtain the spinning solution. Then, wet spinning was performed. After coagulation, washing, drying at 100°C, and cutting, the outer protective layer was obtained.

[0072] S3. Mask assembly: Using polylactic acid nonwoven fabric as the inner skin-friendly layer, the outer protective layer, the middle sterilization layer, and the inner skin-friendly layer are stacked in sequence and formed by hot pressing. Adjustable nose bridge strips and elastic bands are respectively set on the outer protective layer and the inner skin-friendly layer to obtain the protective mask.

[0073] The guanidine salt is 1-cyclopropyl-1-methylguanidine hydrochloride.

[0074] The diamine monomer is hexamethylenediamine.

[0075] The molecular weight of the hydroxypropyl cellulose is 50,000-10,000.

[0076] The concentration of the silver nitrate solution is 2.5 wt%.

[0077] The molecular weight of the polylactic acid is 100,000-2,000,000.

[0078] The crosslinking agent is 1,4-butanedialdehyde glycidyl ether.

[0079] The crosslinking agent is KH670.

[0080] The emulsifier is a combination of Span80 and Tween40 in a mass ratio of 4:1.

[0081] The mineral powder is montmorillonite.

[0082] The temperature for hot pressing is 175°C.

[0083] 3.5 parts of guanidine salt, 1.5 parts of 1-O-acetyl inula lactone, 7.5 parts of diamine monomer and 120 parts of acetone were added to a reaction vessel and heated to reflux under a nitrogen atmosphere for 2.5 h to obtain a solution of guanidine-containing sesquiterpene lactone compound. Then, 1000 parts of hydroxypropyl cellulose and 0.65 parts of silver nitrate solution were added to the solution, stirred for 3 h, and allowed to stand for 16 h. The solution was then electrospun using an electrospinning device. The cellulose electrospun fibers were collected through a collecting plate and cut to obtain the central sterilized layer.

[0084] Comparative Example 1

[0085] A green, eco-friendly, antibacterial composite protective mask

[0086] The difference between this comparative example and Example 1 is that in S1, an equal amount of hydroxypropyl cellulose is used instead of guanidine salt, while the remaining components, component contents, and preparation process steps are the same as in Example 1.

[0087] Comparative Example 2

[0088] A green, eco-friendly, antibacterial composite protective mask

[0089] The difference between this comparative example and Example 1 is that in S1, an equal amount of hydroxypropyl cellulose is used instead of 1-O-acetylspirin lactone, while the remaining components, component contents, and preparation process steps are the same as in Example 1.

[0090] Comparative Example 3

[0091] A green, eco-friendly, antibacterial composite protective mask

[0092] The difference between this comparative example and Example 1 is that the external protective layer is not hydrophobically protected in S2, that is, an equal amount of polylactic acid is used instead of lipophilic protein. The remaining components, component contents, and preparation process steps are the same as in Example 1.

[0093] Results Analysis

[0094] Static water contact angle tests were performed on the external protective layers of each embodiment and comparative example. The water droplet volume was 6 μL, and the experiment was repeated three times, with the average value taken. The instrument used was an OCA200 fully automatic single-fiber contact angle measuring instrument. The test results are shown in […]. Figure 2 .

[0095] The bacterial filtration efficiency of the composite protective masks in each embodiment and comparative example was tested according to the test method in Y0469-2011. The pass standard was that the filtration efficiency of the composite protective mask against Staphylococcus aureus ATCC6538 was not less than 95%. The test results are shown in […]. Figure 3 .

[0096] The composite protective masks of each embodiment and comparative example were subjected to body fluid penetration test and wearing comfort test according to the test method in Y0469-2011. The body fluid penetration test adopted the synthetic blood penetration method, which is as follows: after 2 mL of synthetic blood is sprayed onto the outer protective layer of the mask at a pressure of 16.0 kPa, no penetration should occur on the inner side of the mask. The wearing comfort test adopted the pressure difference test method. The qualified standard is that under the specified conditions, the pressure difference between the two sides of the mask for gas exchange should not be greater than 49 Pa. The test results are shown in Table 1.

[0097] Table 1. Results of fluid penetration tests and wearing comfort tests for each embodiment and comparative example.

[0098]

[0099] Antibacterial properties were tested on the composite protective masks prepared in each embodiment and comparative example. The test results are shown in [the table below]. Figure 4 .

[0100] The antibacterial test method is as follows: Inoculate 0.1 mL of Staphylococcus aureus ATCC6538 and Escherichia coli ATCC35401 into 100 mL of sterile nutrient broth, activate for 2-3 generations, and achieve a bacterial concentration of 10. 11 The concentration was calculated as CFU / mL. Then, 1 mL of the activated bacterial culture was added to sterile nutrient broth (0.8%) and diluted decimal to a concentration of 10. 6CFU / mL, mask samples with a diameter of 10 mm were sterilized under UV light for 2 hours and then placed in diluted nutrient solutions of Staphylococcus aureus and Escherichia coli, respectively. The samples were then incubated at 37°C with shaking for 12 hours. Finally, 0.1 mL of the cultured bacterial solution was spread onto nutrient agar plates and incubated upside down at 37°C for 24 hours. The total number of colonies was recorded, and the inhibition rate was calculated according to the following formula: Inhibition rate = (AB) / A × 100%, where A is the total number of colonies without sample treatment and B is the total number of colonies after sample treatment. The experiment was repeated 3 times and the average value was taken.

[0101] As can be seen from the above test results, the composite protective mask prepared in the embodiments of the present invention has a static water contact angle that is much larger than that of the comparative proportions. The filtration efficiency for Staphylococcus aureus exceeds 99%, which is higher than that of the comparative proportions. No penetration phenomenon was observed in the body fluid penetration test. The pressure difference between the two sides of the mask is low, making it comfortable to wear. Furthermore, it has a very strong antibacterial rate against Staphylococcus aureus and Escherichia coli. In summary, the modification of the outer protective layer and the inner antibacterial layer of the present invention enables the composite protective mask to have the functions of hydrophobicity, water repellency, and protection against blood splashes. It also has excellent bacterial filtration and sterilization capabilities and long-lasting sterilization capabilities.

[0102] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

[0103] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention. The actual application is not limited to this. In conclusion, if those skilled in the art are inspired by this description and design similar methods and embodiments without departing from the spirit of the present invention, they should all fall within the protection scope of the present invention.

Claims

1. A green ecological antibacterial composite protective mask, comprising an outer protective layer (1), characterized in that: One side of the outer protective layer (1) is fixedly connected to the middle sterilization layer (2), the side of the middle sterilization layer (2) away from the outer protective layer (1) is fixedly connected to the inner skin-friendly layer (3), the sides of the side of the inner skin-friendly layer (3) away from the middle sterilization layer (2) are fixedly connected to elastic bands (4), and the upper part of the side of the outer protective layer (1) away from the middle sterilization layer (2) is fixedly connected to an adjustable nose bridge strip (5); the protective mask is prepared by the following steps: S1. Preparation of the middle sterilization layer: 1.5-5 parts of guanidine salt, 0.5-2.5 parts of 1-O-acetyl inulinolactone, 5-10 parts of diamine monomer and 100-150 parts of acetone are added to a reaction container, heated to reflux under a nitrogen atmosphere, reacted for 1.5-3 hours to obtain a guanidine-containing sesquiterpene lactone compound solution, and then 80-120 parts of hydroxypropyl cellulose and 0.1-1 part of silver nitrate solution are added to the solution, stirred for 2-4 hours, allowed to stand for 12-24 hours, added to an electrospinning device for electrospinning, and the cellulose electrospun fibers are received by a collecting plate, and the middle sterilization layer is obtained after cutting; S2, preparation of external protective layer: dissolving the liposoluble protein in 100-150 parts of ethyl acetate, stirring at 100-120° C. for 0.5-1 h, adding 80-120 parts of polylactic acid, 10-15 parts of mineral powder, 10-20 parts of cross-linking agent, 5-8 parts of coupling agent, 0.5-2 parts of emulsifier, stirring for 1.5-3 h to obtain spinning solution, and then wet spinning, coagulation, water washing, 80-120° C. drying, cutting to obtain the external protective layer; S3. Mask assembly: Use polylactic acid non-woven fabric as the inner skin-friendly layer, overlap the outer protective layer, the middle sterilization layer, and the inner skin-friendly layer in order, and form them by hot pressing and bonding. Set adjustable nose bridge strips and elastic bands on the outer protective layer and the inner skin-friendly layer, respectively, to obtain the protective mask.

2. A green ecological antibacterial composite protective mask according to claim 1, characterized in that: The guanidine salt is one of 1,1-dimethylbiguanidine, tetramethylguanidine hydrochloride, 2-n-butyl-1,1,3,3-tetramethylguanidine, 1-cyclopropyl-1-methylguanidine hydrochloride, and N-(6-(3-methylguanidino)hexyl)acetimide.

3. A green ecological antibacterial composite protective mask according to claim 2, characterized in that: The diamine monomer is one of triethylenediamine, tetraethylenediamine, oxalyl diamine, hexamethylenediamine, 1,4-butanediamine dihydrochloride, 1,5-pentanediamine hydrochloride, and 1,8-octanediamine.

4. A green ecological antibacterial composite protective mask according to claim 3, characterized in that: The molecular weight of the hydroxypropyl cellulose is 50,000-10,000.

5. The green ecological antibacterial composite protective mask according to claim 4, characterized in that: The concentration of the silver nitrate solution is 1.0-3.5 wt %.

6. The green ecological antibacterial composite protective mask according to claim 5, characterized in that: Furthermore, the molecular weight of the polylactic acid is 100,000-2,000,000.

7. The green ecological antibacterial composite protective mask according to claim 6, characterized in that: The cross-linking agent is one of 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide, N-hydroxysuccinimide, and 1,4-butanedialdehyde glycidyl ether.

8. The green ecological antibacterial composite protective mask according to claim 7, characterized in that: The cross-linking agent is one of KH550, KH570, KH670 and KH790; the emulsifier is a combination of one of Span20, Span60 and Span80 and one of Tween40, Tween60 and Tween85.

9. The green ecological antibacterial composite protective mask according to claim 8, characterized in that: The mineral powder is one of zeolite powder, hectorite powder and montmorillonite.

10. The green ecological antibacterial composite protective mask according to claim 9, characterized in that: The temperature of the thermal compression bonding is 160-180°C.

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