Silver-containing filter element and method for producing same, and a mask

Abstract

The present application relates to the technical field of health protection products, and provides a silver-containing filter element, a preparation method thereof and a mask. The silver-containing filter element is formed by loading silver ions and nano-silver on a base cloth to form a silver-containing antibacterial layer, and the silver ions and nano-silver have broad-spectrum bactericidal properties to effectively kill bacteria. The silver-containing filter element provided by the present application can also effectively filter viruses and fine particulate matters, and has a simple structure and can be used multiple times. The silver-containing filter element provided by the present application includes various forms and can meet the needs of different occasions. Furthermore, the base cloth of the antibacterial layer of the silver-containing filter element is also loaded with chitosan and / or silk fibroin, and the chitosan and silk fibroin also have certain bactericidal properties, thereby further improving the bactericidal capacity of the silver-containing filter element. In addition, the base cloth of the silver-containing antibacterial layer is made of silk film cloth, and the base cloth itself also has certain bactericidal capacity and is soft and comfortable. The mask prepared by using the silver-containing filter element has good protection effect and can be used for a long time.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of health protection products, in particular to a silver-containing filter element and a preparation method thereof, and a mask. BACKGROUND

[0002] With the development of science and technology and social progress, a series of environmental problems have been brought about, and at the same time, people's awareness of self-protection is becoming stronger and stronger. Bacteria and viruses in the environment have gradually become an important factor endangering people's life and health. However, these microbial pollution is usually unobservable in daily life, making it difficult for people to take the initiative to protect themselves.

[0003] In order to avoid the dangers brought by dust and bacterial and viral microorganisms in the air, various high-end protection devices have emerged. Masks are the most widely used daily protection products for people, such as disposable non-woven masks for isolating bacteria and dust, gauze masks commonly used in medical and scientific research fields, and anti-virus masks with intermediate filter devices. The masks for preventing viruses are mainly disposable medical masks, N95 protective masks and the like.

[0004] At present, due to functional requirements and price factors, masks on the market generally use disposable synthetic materials and complex structural designs to achieve virus filtration and sterilization functions, thus some problems exist, such as material waste and material comfort problems during use of disposable medical masks, short use time, and most of the disposable medical masks and N95 masks only have the function of filtering bacteria and viruses, but do not have the function of sterilizing and removing viruses; the mask structure with air filter valves and air exchange channels is complex, internal damage or failure is not easy to be found, and there is a risk of not achieving the protection effect. SUMMARY

[0005] Therefore, the present application provides a silver-containing filter element and a preparation method thereof, and a mask. The silver-containing filter element provided by the present application has simple structure, both sterilization function and virus filtration and other small particle functions, and can be used repeatedly.

[0006] In order to achieve the above-mentioned application purposes, the present application provides the following technical solutions:

[0007] A silver-containing filter element, which is a single-layer silver-containing bacteriostatic layer.

[0008] Alternatively, the silver-containing filter element comprises a silver-containing bacteriostatic layer and a barrier layer arranged on one side surface of the silver-containing bacteriostatic layer.

[0009] Alternatively, the silver-containing filter element comprises a barrier layer and silver-containing bacteriostatic layers arranged on both side surfaces of the barrier layer.

[0010] The silver-containing bacteriostatic layer comprises a base cloth and a silver-based substance loaded on the base cloth; the silver-based substance comprises silver ions and / or nano-silver.

[0011] Preferably, the base cloth is also loaded with chitosan and / or silk fibroin.

[0012] Preferably, the base cloth is a polypropylene fiber membrane cloth, a silk membrane cloth, a chitosan membrane cloth or an activated carbon membrane cloth; the gram weight of the base cloth is 18-98 g / m 2 ;

[0013] The gram weight of the silver-containing antibacterial layer is 19.6-98.5 g / m 2 ;

[0014] The barrier layer is a polypropylene melt-blown cloth; the fiber fineness of the polypropylene melt-blown cloth is 0.5-1.5 μm.

[0015] The application also provides a preparation method of the silver-containing filter element described in the above scheme, comprising the following steps:

[0016] When the silver-containing filter element is a single-layer silver-containing antibacterial layer, the preparation method of the silver-containing filter element comprises the following steps: coating a silver-containing aqueous solution on one side surface of the base cloth, and then sequentially performing film pressing and drying to obtain the silver-containing antibacterial layer, i.e., the silver-containing filter element;

[0017] When the silver-containing filter element comprises a silver-containing antibacterial layer and a barrier layer arranged on one side surface of the silver-containing antibacterial layer, the preparation method of the silver-containing filter element comprises the following steps: placing the barrier layer on one side surface of the silver-containing antibacterial layer, and then performing heat sealing to obtain the silver-containing filter element;

[0018] When the silver-containing filter element comprises a barrier layer and silver-containing antibacterial layers arranged on both side surfaces of the barrier layer, the preparation method of the silver-containing filter element comprises the following steps: placing two pieces of silver-containing antibacterial layers on both side surfaces of the barrier layer, and then performing heat sealing to obtain the silver-containing filter element;

[0019] The silver-containing aqueous solution comprises a silver ion aqueous solution and / or a nano-silver aqueous solution.

[0020] Preferably, the concentration of the silver ion aqueous solution or the nano-silver aqueous solution is independently 0.1-2.5 ppm.

[0021] Preferably, the silver-containing aqueous solution further comprises a silver-containing chitosan aqueous solution and / or a silver-containing silk fibroin aqueous solution; the silver in the silver-containing chitosan aqueous solution or the silver-containing silk fibroin aqueous solution is silver ion or nano-silver;

[0022] The concentration of chitosan in the silver-containing chitosan aqueous solution is 0.001-0.05 g / mL, and the concentration of silver ion or nano-silver is 0.1-2.5 ppm;

[0023] The concentration of the silk fibroin in the silver-containing silk fibroin aqueous solution is 0.001-0.05 g / mL, and the concentration of the silver ion or nano-silver is 0.1-2.5 ppm.

[0024] Preferably, the mass ratio of the silver-containing aqueous solution to the base cloth during coating is 1:0.1-10.

[0025] Preferably, the method for pressing the film is as follows: the base cloth coated with the silver-containing aqueous solution on one side is folded inward, and then is placed between two stainless steel plates for gradient pressing; the gradient pressing includes a first pressing stage, a second pressing stage and a third pressing stage performed in sequence, the force of the first pressing stage is 50-100 kg, and the pressing time is 1-30 min, the force of the second pressing stage is 175-225 kg, and the pressing time is 1-30 min, the force of the third pressing stage is 500 kg, and the pressing time is 1-10 min.

[0026] The application further provides a mask, comprising a mask base and a rope, wherein the mask base comprises an inner layer, a middle layer and an outer layer arranged in sequence, and the middle layer is the silver-containing filter element or the silver-containing filter element prepared by the preparation method.

[0027] Preferably, the material of the inner layer and the outer layer is silk cloth or non-woven fabric independently.

[0028] The application provides a silver-containing filter element, which forms a silver-containing antibacterial layer by loading silver ions and nano-silver on a base cloth, effectively kills bacteria by using the broad-spectrum bactericidal property of silver ions and nano-silver, and can effectively filter viruses and fine particulate matters, and has simple structure, long service time and multiple uses; the silver-containing filter element provided by the application includes various forms and can meet the needs of different occasions. Further, the silver-containing filter element provided by the application further loads chitosan and / or silk fibroin on the base cloth of the antibacterial layer, and chitosan and silk fibroin also have certain bactericidal property, thereby further improving the bactericidal capacity of the silver-containing filter element; further, the application uses silk film cloth as the base cloth of the silver-containing antibacterial layer, and the base cloth itself also has certain bactericidal capacity and is soft and comfortable. The mask prepared by using the silver-containing filter element has good protection effect and can be used for a long time. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 Fig. 1 is a structural schematic diagram of the silver-containing filter element; wherein, 1 is a silver-containing antibacterial layer, 2 is a barrier layer, 1-1 is a silver-containing layer, and 1-2 is a base cloth;

[0030] Figure 2 Fig. 2 is a schematic diagram of the film pressing process;

[0031] Figure 3The structure diagram of the mask, wherein, 3 - inner layer, 4 - middle layer, 5 - outer layer. DETAILED DESCRIPTION

[0032] The application provides a silver-containing filter element, which has the structure as shown in the figure. Figure 1 The silver-containing filter element has any of the following structures.

[0033] I. The silver-containing filter element is a single-layer silver-containing bacteriostatic layer, as shown in A of the figure. Figure 1 The filter element with this structure can be used to block general viruses and bacteria.

[0034] II. The silver-containing filter element comprises a silver-containing bacteriostatic layer and a blocking layer arranged on one side surface of the silver-containing bacteriostatic layer, as shown in B of the figure. Figure 1 In the application, the second type of filter element has two application forms, one is that the blocking layer is outward and the bacteriostatic layer is inward, as shown in B1 of the figure, which is suitable for people suffering from influenza and the like to prevent infection of others. Figure 1 The other is that the blocking layer is inward and the bacteriostatic layer is outward, as shown in B2 of the figure, which is suitable for personal protection of normal healthy people in the influenza season. Figure 1

[0035] III. The silver-containing filter element comprises a blocking layer and silver-containing bacteriostatic layers arranged on both side surfaces of the blocking layer, as shown in C of the figure. Figure 1 This structure is suitable for personal protection and protection of others in the case of serious influenza virus.

[0036] In the application, the silver-containing filter elements with the above three structures can be used for a long time, and in the specific use process, if the breathing resistance becomes large or the bactericidal efficiency is reduced by more than 20%, the silver-containing filter element is considered to be invalid.

[0037] In the application, the silver-containing bacteriostatic layer comprises a base cloth and silver substances loaded on the base cloth; the silver substances comprise silver ions and / or nano-silver.In the application, the base cloth preferably further loads chitosan and / or silk fibroin; in the specific embodiment of the application, the substances loaded on the base cloth can be specifically the following: silver ions, nano-silver, silver ion-chitosan, nano-silver-chitosan, silver ion-silk fibroin, nano-silver-silk fibroin, silver ion-nano-silver-silk fibroin, silver ion-nano-silver-chitosan, silver ion-nano-silver-silk fibroin-chitosan. In the application, the grammage of the silver-containing bacteriostatic layer is preferably 19.6-98.5 g / m 2 , and more preferably 21-96 g / m 2 .

[0038] In the present application, silver ions and nano-silver have broad-spectrum antibacterial properties, and chitosan and silk fibroin also have certain antibacterial ability. The present application loads the above substances on the base cloth to obtain a silver-containing bacteriostatic layer which has both sterilization ability and virus and fine particulate matter filtering ability.

[0039] In the present application, the base cloth is preferably a polypropylene fiber membrane cloth, a silk membrane cloth, a chitosan membrane cloth or an activated carbon membrane cloth, and more preferably a silk membrane cloth or a chitosan membrane cloth; the gram weight of the base cloth is preferably 18-98 g / m 2 , and more preferably 20-95 g / m 2 . The above types of base cloth selected in the present application not only can filter fine particles, but also have certain sterilization performance, which can further improve the sterilization ability of the silver-containing filter element.

[0040] In the present application, the barrier layer is preferably a polypropylene melt-blown cloth; the fiber fineness of the polypropylene melt-blown cloth is 0.5-1.5 μm, and more preferably 0.8-1.2 μm. In the present application, the barrier layer can effectively block viruses or bacteria that are not blocked and killed by the silver-containing bacteriostatic layer, which is conducive to further improving the bacterium filtering efficiency of the filter element; the present application does not have special requirements for the polypropylene melt-blown cloth, and commercially available products known to those skilled in the art can be used.

[0041] The present application also provides a preparation method of the silver-containing filter element described in the above scheme, which comprises the following steps:

[0042] When the silver-containing filter element is a single-layer silver-containing bacteriostatic layer, the preparation method of the silver-containing filter element comprises the following steps: coating a silver-containing aqueous solution on one side surface of the base cloth, and then sequentially performing film pressing and drying to obtain the silver-containing bacteriostatic layer, which is the silver-containing filter element.

[0043] In the present application, the silver-containing aqueous solution comprises a silver ion aqueous solution and / or a nano-silver aqueous solution; the silver ion aqueous solution is preferably prepared by using silver nitrate and water; the nano-silver aqueous solution is preferably prepared by using nano-silver and water; the water is preferably purified water, deionized water or distilled water; the concentration of the silver ion aqueous solution and the nano-silver aqueous solution is independently preferably 0.1 ppm-2.5 ppm, and more preferably 5-2 ppm; in a specific embodiment of the present application, a silver ion aqueous solution with a concentration of 1000 ppm is first prepared, and then the silver ion aqueous solution is mixed with water in a mass ratio of 1:(399-9999), stirred at a temperature of 15-30℃ and a speed of 60-180 rpm for 5-50 minutes to obtain a silver ion aqueous solution with a concentration of 0.1 ppm-25 ppm; the preparation method of the nano-silver aqueous solution is the same as that of the silver ion aqueous solution, and will not be described here.

[0044] In the present application, the silver-containing aqueous solution preferably further comprises a silver-containing chitosan aqueous solution, the silver in the silver-containing chitosan aqueous solution is silver ions or nano-silver, i.e. the silver-containing chitosan aqueous solution is a silver ion-chitosan aqueous solution or a nano-silver-chitosan aqueous solution; the concentration of chitosan in the silver-containing chitosan aqueous solution is preferably 0.001-0.05 g / mL, more preferably 0.005-0.03 g / mL, and the concentration of silver ions or nano-silver is preferably 0.1-2.5 ppm, more preferably 0.5-2 ppm.

[0045] The preparation process of the silver-containing chitosan aqueous solution is described below by taking a silver ion-chitosan aqueous solution as an example: glacial acetic acid, silver ion aqueous solution and chitosan are mixed to obtain a silver ion-chitosan aqueous solution. In the present application, the concentration of the silver ion aqueous solution is the same as that in the above scheme, which will not be described herein again. In the specific embodiments of the present application, the silver ion-chitosan aqueous solution can be prepared by directly using the silver ion aqueous solution with a concentration of 0.1-2.5 ppm prepared according to the above scheme; the volume ratio of the glacial acetic acid to the silver-containing aqueous solution is 0.5-2:98-99.5, more preferably 1:99, and the ratio of the mass of the chitosan to the total volume of the glacial acetic acid and the silver-containing aqueous solution is 0.1-5 g:100 mL; the deacetylation degree of the chitosan is preferably 70-95%; the glacial acetic acid and the silver ion aqueous solution are preferably mixed first, and then the chitosan is added, and then the mixture is stirred at a speed of 60-250 rpm for 4-24 h to obtain the silver ion-chitosan aqueous solution.

[0046] In the present application, the preparation method of the nano-silver-chitosan aqueous solution is the same as that of the silver ion-chitosan aqueous solution, except that the silver ion aqueous solution is replaced by a nano-silver aqueous solution. The nano-silver-chitosan aqueous solution is preferably prepared by directly using the nano-silver aqueous solution with a concentration of 0.1-2.5 ppm prepared according to the above scheme.

[0047] In the present application, the silver-containing aqueous solution preferably further comprises a silver-containing silk fibroin aqueous solution, the silver in the silver-containing silk fibroin aqueous solution is silver ions or nano-silver, i.e. the silver-containing silk fibroin aqueous solution is a silver ion-silk fibroin aqueous solution or a nano-silver-silk fibroin aqueous solution; the concentration of silk fibroin in the silver-containing silk fibroin aqueous solution is preferably 0.001-0.05 g / mL, more preferably 0.005-0.03 g / mL, and the concentration of silver ions or nano-silver is preferably 0.1-2.5 ppm, more preferably 0.5-2 ppm.

[0048] The preparation process of the silver ion-silk fibroin aqueous solution is described below by taking silver ion-silk fibroin aqueous solution as an example: silk fibroin and silver ion aqueous solution are mixed to obtain silver ion-silk fibroin aqueous solution; the mass ratio of the silk fibroin to the silver ion aqueous solution is 0.1-5 g:100 mL; the concentration of the silver ion aqueous solution is preferably consistent with the above scheme, and in the specific embodiments of the present application, the silver ion-silk fibroin aqueous solution is prepared directly by using the silver ion aqueous solution with a concentration of 0.1-2.5 ppm prepared according to the above scheme; the mixing is preferably carried out under stirring, and the stirring speed is preferably 60-180 rpm, and the stirring time is preferably 4-24 h.

[0049] In the present application, the preparation method of the silver ion-silk fibroin aqueous solution is the same as that of the silver ion-silk fibroin aqueous solution, and only the silver ion aqueous solution therein is replaced by the nano-silver aqueous solution. The present application preferably uses the nano-silver aqueous solution with a concentration of 0.1-2.5 ppm prepared according to the above scheme to prepare the nano-silver-silk fibroin aqueous solution.

[0050] In the present application, the mass ratio of the silver-containing aqueous solution to the base cloth during coating is preferably 1:0.1-10, and more preferably 1:0.5-8.

[0051] In the present application, the method for pressing the film is preferably as follows: the side of the base cloth coated with the silver-containing solution is folded inward, and then placed between two stainless steel plates, and then gradient pressing is carried out; in the present application, the size of the base cloth is preferably 20*40 cm, and the present application is preferably folded along the long side to obtain a square piece of 20*20 cm; in the present application, the size of the stainless steel plate is preferably not less than that of the base cloth after folding, and the thickness of the stainless steel plate is preferably 3-5 cm. In the present application, the gradient pressing preferably comprises a first pressing stage, a second pressing stage and a third pressing stage carried out in sequence, the force of the first pressing stage is preferably 50-100 kg, and more preferably 60-90 kg, and the pressing time is preferably 1-30 min, and more preferably 5-25 min; the force of the second pressing stage is preferably 175-225 kg, and more preferably 180-200 kg, and the pressing time is preferably 1-30 min, and more preferably 5-25 min; the force of the third pressing stage is preferably 500 kg, and the pressing time is preferably 1-10 min, and more preferably 3-8 min; in the specific embodiments of the present application, a plurality of base cloths coated with the silver-containing aqueous solution after folding are simultaneously subjected to film pressing, and the schematic diagram of the film pressing is shown in Figure 2 Figure 2 Specifically, the schematic diagram of simultaneously pressing four base cloths coated with the silver-containing aqueous solution after folding. By film pressing, the present application can enable the silver-containing aqueous solution to penetrate into the inside of the base cloth, and enhance the connection of silver ions, nano-silver, chitosan and silk fibroin with the base cloth.​

[0052] In the present application, the drying temperature is preferably 30-80℃, more preferably 40-60℃, and the drying time is preferably 4-24h, more preferably 5-20h.

[0053] In the present application, when the silver-containing filter core comprises a silver-containing bacteriostatic layer and a barrier layer arranged on one side surface of the silver-containing bacteriostatic layer, the preparation method of the silver-containing filter core comprises the following steps: placing the barrier layer on one side surface of the silver-containing bacteriostatic layer, and then performing heat sealing to obtain the silver-containing filter core. In the present application, the preparation method of the silver-containing bacteriostatic layer is consistent with the above scheme, and will not be described here again; the heat sealing temperature is preferably 165-200℃, more preferably 170-190℃; and the heat sealing is preferably hot pressing or adhesion using PP hot melt adhesive.

[0054] In the present application, when the silver-containing filter core comprises a barrier layer and silver-containing bacteriostatic layers arranged on both side surfaces of the barrier layer, the preparation method of the silver-containing filter core comprises the following steps: placing two silver-containing bacteriostatic layers on both side surfaces of the barrier layer, respectively, and then performing heat sealing to obtain the silver-containing filter core. In the present application, the preparation method of the silver-containing bacteriostatic layer is consistent with the above scheme, and will not be described here again; the heat sealing method and conditions are preferably consistent with the above scheme, and will not be described here again.

[0055] The present application also provides a mask, comprising a mask base and a rope, wherein the mask base comprises an inner layer, a middle layer and an outer layer arranged in sequence, and a structure diagram of the mask base is shown in Figure 3 ; the middle layer is the silver-containing filter core described in the above scheme or prepared by the preparation method described in the above scheme; in the present application, an opening is preferably arranged between the inner layer and the outer layer of the mask base to facilitate replacement of the silver-containing filter core, and the application form of the silver-containing filter core is consistent with the above scheme, and specific forms are shown in Figure 1 ; in the present application, the material of the inner layer is preferably silk cloth or non-woven fabric, more preferably silk cloth; and the material of the outer layer is preferably silk cloth or non-woven fabric, more preferably silk cloth. In the present application, the silver-containing filter core can be used repeatedly, and the mask base can be continuously used after sterilization by an auxiliary equipment, and the mask provided by the present application has simple structure, good protection effect, sterilization ability, virus and micro-particle filtering ability, and can be used repeatedly.

[0056] The present application does not have special requirements for the preparation method of the mask base, and the mask base can be prepared by using methods well known to those skilled in the art.

[0057] The technical solutions in the present application will be described clearly and completely in combination with the embodiments in the present application.

[0058] Example 1

[0059] Preparation of silver-containing filter element including only single-layer silver-containing antibacterial layer:

[0060] First, a silver ion aqueous solution with a concentration of 1000 ppm was prepared using silver nitrate and deionized water, and then 1 liter of the silver ion aqueous solution was mixed with deionized water at a mass ratio of 1:499 to obtain a silver ion aqueous solution with a concentration of 2 ppm at a temperature of 25°C and a stirring speed of 60 rpm for 100 minutes.

[0061] The silver ions were coated on one side of a silk membrane cloth (area of 20 cm*40 cm and grammage of 19.4 g / m 2 ), and the mass ratio of the silver ion aqueous solution to the cloth was 1:5. The side of the silk membrane cloth coated with the silver ion aqueous solution was folded inward to form a 20 cm*20 cm square, and was placed on a square stainless steel plate with a length and width of not less than 20 cm*20 cm and a thickness of 3 cm. Another square stainless steel plate with the same size was placed on the top, and a gradient pressure of 50 kg was applied for 5 minutes, a gradient pressure of 175 kg was applied for 10 minutes, and a gradient pressure of 500 kg was applied for 5 minutes. Drying was performed at 60°C for 4 hours to obtain a silver-containing antibacterial layer (grammage of 19.6 g / m 2 ), which was denoted as silver-containing filter element A-1.

[0062] Example 2

[0063] The silver-containing antibacterial layer prepared in Example 1 was taken, and a polypropylene melt-blown cloth (grammage of 60.0 g / m 2 ) with the same size was placed on the silver-containing antibacterial layer and heat-sealed at 165°C to obtain a silver-containing filter element including a silver-containing antibacterial layer and a single-side barrier layer, which was denoted as silver-containing filter element B-1.

[0064] Example 3

[0065] The silver-containing antibacterial layer prepared in Example 1 was taken, and two pieces of the silver-containing antibacterial layer were placed on the upper and lower surfaces of a polypropylene melt-blown cloth (grammage of 60.0 g / m 2 ) with the same size, and heat-sealed at 165°C to obtain a silver-containing filter element including a silver-containing antibacterial layer and a double-side barrier layer, which was denoted as silver-containing filter element C-1.

[0066] Examples 4-6

[0067] The other conditions were the same as in Example 1, except that the silver ion aqueous solution was replaced by a nano-silver aqueous solution to obtain a silver-containing antibacterial layer (grammage of 19.8 g / m 2 ), which was denoted as silver-containing filter element A-2;

[0068] The other conditions were the same as in Example 2, except that the silver-containing antibacterial layer was replaced by the silver-containing antibacterial layer prepared in Example 4 to obtain a silver-containing filter element B-2;

[0069] Other than the same as example 3, only the silver-containing bacteriostatic layer is replaced by the silver-containing bacteriostatic layer prepared in example 4, to obtain a silver-containing filter core C-2.

[0070] Example 7

[0071] Other than the same as example 1, only the silver ion aqueous solution is replaced by the silver ion-chitosan solution, which is prepared as follows: 1 ml of glacial acetic acid is added to 99 ml of silver ion aqueous solution (concentration of 2 ppm, prepared in the same way as example 1), to obtain an aqueous solution containing acetic acid and silver ions, and then a chitosan powder with a deacetylation degree of 95% is weighed and dissolved in the aqueous solution containing acetic acid and silver ions at a mass-volume ratio of 3 g: 100 mL, and stirred at a speed of 250 rpm for 24 h to obtain a silver ion-chitosan solution.

[0072] The preparation of the silver-containing bacteriostatic layer is carried out according to the method of example 1, to obtain a silver-containing bacteriostatic layer (gram weight of 20.22 g / m 2 ), which is recorded as a silver-containing filter core A-3.

[0073] Example 8

[0074] Other than the same as example 2, only the silver-containing bacteriostatic layer is replaced by the silver-containing bacteriostatic layer prepared in example 7, to obtain a silver-containing filter core B-3.

[0075] Example 9

[0076] Other than the same as example 3, only the silver-containing bacteriostatic layer is replaced by the silver-containing bacteriostatic layer prepared in example 7, to obtain a silver-containing filter core C-3.

[0077] Examples 10-12

[0078] Other than the same as example 7, only the silver ion aqueous solution is replaced by the nanosilver aqueous solution, to obtain a nanosilver-chitosan solution; and the prepared silver-containing bacteriostatic layer (gram weight of 20.3 g / m 2 ) is recorded as a silver-containing filter core A-4;

[0079] Other than the same as example 2, only the silver-containing bacteriostatic layer is replaced by the silver-containing bacteriostatic layer prepared in example 10, to obtain a silver-containing filter core B-4.

[0080] Other than the same as example 3, only the silver-containing bacteriostatic layer is replaced by the silver-containing bacteriostatic layer prepared in example 10, to obtain a silver-containing filter core C-4.

[0081] Example 13

[0082] Other than the same as example 1, only the silver ion aqueous solution is replaced by silver ion-silk fibroin solution, and the preparation method is as follows: silk fibroin powder is weighed, and is dissolved in silver ion aqueous solution (concentration is 2 ppm, preparation method is the same as example 1) at a mass volume ratio of 5 g: 100 mL, and is stirred at a speed of 180 rpm for 4 h to obtain silver-containing silk fibroin aqueous solution.

[0083] According to the method of example 1, the preparation of the silver-containing antibacterial layer is carried out, and the silver-containing antibacterial layer (gram weight is 19.8 g / m 2 ), which is recorded as silver-containing filter core A-5.

[0084] Example 14

[0085] Other than the same as example 2, only the silver-containing antibacterial layer is replaced by the silver-containing antibacterial layer prepared in example 13, and the silver-containing filter core B-5 is obtained.

[0086] Example 15

[0087] Other than the same as example 3, only the silver-containing antibacterial layer is replaced by the silver-containing antibacterial layer prepared in example 13, and the silver-containing filter core C-5 is obtained.

[0088] Examples 16-18

[0089] Other than the same as example 13, only the silver ion aqueous solution is replaced by silver nano aqueous solution, and silver nano-silk fibroin aqueous solution is obtained; the silver-containing antibacterial layer prepared (gram weight is 20.1 g / m 2 ) is recorded as silver-containing filter core A-6;

[0090] Other than the same as example 2, only the silver-containing antibacterial layer is replaced by the silver-containing antibacterial layer prepared in example 10, and the silver-containing filter core B-6 is obtained.

[0091] Other than the same as example 3, only the silver-containing antibacterial layer is replaced by the silver-containing antibacterial layer prepared in example 10, and the silver-containing filter core C-6 is obtained.

[0092] Performance test:

[0093] According to the method of GB15979, Chinese Pharmacopoeia and YY 0469-2011 Medical Standard of Medical Surgical Mask, the bactericidal ability test of part of the above silver-containing filter core is carried out, and the particle filtration ability test and the use time test of effective filtering particles are carried out according to the method of YY 0469-2011 Medical Standard of Medical Surgical Mask, and the results are shown in table 1.

[0094] Table 1 test results

[0095]

[0096]

[0097] The silver-containing filter cartridges prepared in Examples 1-18 not listed in Table 1 were subjected to the same tests, and the results showed that the silver-containing filter cartridges all had excellent bactericidal performance, high particle filtration efficiency, and long service life.

[0098] Examples 19-21

[0099] The silver-containing filter cartridges prepared in Examples 1-3 were used as the intermediate layer to prepare masks, and the inner and outer layers of the mask body were both silk cloth, which were denoted as mask A-1, mask B-1 and mask C-1.

[0100] The above only describes the preferred embodiments of the present application, and it should be noted that for those skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can be made, and these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A silver-containing filter element, characterized in that The silver-containing filter element is composed of a barrier layer and silver-containing antibacterial layers arranged on both sides of the barrier layer; the silver-containing antibacterial layer is composed of a base cloth and silver-containing substances loaded on the base cloth; the silver-containing substances are silver ions and / or nano-silver; the base cloth further carries silk fibroin; The base cloth is a polypropylene fiber membrane cloth, a silk membrane cloth, a chitosan membrane cloth or an activated carbon membrane cloth; the gram weight of the base cloth is 18-98 g / m 2 ; the gram weight of the silver-containing antibacterial layer is 19.6-98.5 g / m 2 ; the barrier layer is a polypropylene melt-blown cloth; the fiber fineness of the polypropylene melt-blown cloth is 0.5-1.5 μm; The preparation method of the silver-containing antibacterial layer comprises the following steps: coating silver-containing aqueous solution on one side surface of the base cloth, and then sequentially performing film pressing and drying to obtain the silver-containing antibacterial layer; The film pressing method comprises the following steps: folding the side of the base cloth coated with silver-containing aqueous solution inward, and then placing it between two stainless steel plates for gradient pressing; the gradient pressing comprises sequentially performing a first pressing stage, a second pressing stage and a third pressing stage; the force of the first pressing stage is 50-100 kg, and the pressing time is 1-30 min; the force of the second pressing stage is 175-225 kg, and the pressing time is 1-30 min; the force of the third pressing stage is 500 kg, and the pressing time is 1-10 min.

2. The method of claim 1, wherein the silver-containing filter is prepared by, The method comprises the following steps: Two silver-containing antibacterial layers are placed on both sides of the barrier layer, and then heat-sealed to obtain the silver-containing filter element; The preparation method of the silver-containing antibacterial layer comprises the following steps: coating silver-containing aqueous solution on one side surface of the base cloth, and then sequentially performing film pressing and drying to obtain the silver-containing antibacterial layer; the film pressing method comprises the following steps: folding the side of the base cloth coated with silver-containing aqueous solution inward, and then placing it between two stainless steel plates for gradient pressing; the gradient pressing comprises sequentially performing a first pressing stage, a second pressing stage and a third pressing stage; the force of the first pressing stage is 50-100 kg, and the pressing time is 1-30 min; the force of the second pressing stage is 175-225 kg, and the pressing time is 1-30 min; the force of the third pressing stage is 500 kg, and the pressing time is 1-10 min; The silver-containing aqueous solution comprises silver ion aqueous solution and / or nano-silver aqueous solution; the silver-containing aqueous solution is silver-containing silk fibroin aqueous solution.

3. The production method according to claim 2, characterized by, The concentration of the silver ion aqueous solution or the nano-silver aqueous solution is independently 0.1-2.5 ppm.

4. The production method according to claim 2, characterized by, The concentration of silk fibroin in the silver-containing silk fibroin aqueous solution is 0.001-0.05 g / mL, and the concentration of silver ions or nano-silver is 0.1-2.5 ppm.

5. The production method according to claim 2 or 3, characterized by, The mass ratio of the silver-containing aqueous solution to the base cloth is 1:0.1-10.

6. A facemask comprising a facemask base and a strap, characterized in that, The mask substrate comprises an inner layer, a middle layer and an outer layer arranged in sequence; the middle layer is the silver-containing filter element of claim 1 or the silver-containing filter element prepared by the preparation method of any one of claims 2-5.

7. The facemask of claim 6, wherein, The materials of the inner layer and the outer layer are independently silk cloth or non-woven fabric.

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