Antibacterial and antiviral master batch as well as preparation method and application thereof

Abstract

The invention provides an antibacterial and antiviral master batch as well as a preparation method and application thereof. The antibacterial and antiviral master batch comprises the following components in parts by weight: 50-65 parts of polypropylene, 20-32 parts of polyethylene terephthalate, 3-8 parts of an antibacterial and antiviral agent, 1-5 parts of a surfactant and 0.1-0.5 part of a dispersing agent. The antibacterial and antiviral master batch has good antibacterial and antiviral effects, the antibacterial and antiviral effects are lasting, and after the antibacterial and antiviral master batch is used for melt-blown cloth, the obtained antibacterial and antiviral melt-blown cloth has remarkably enhanced antibacterial and antiviral performance.

Description

Technical Field

[0001] The present invention belongs to the technical field of antibacterial materials, and in particular relates to an antibacterial and antiviral masterbatch and a preparation method and application thereof. Background Art

[0002] Meltblown fabric is a nonwoven fabric made by extruding a polymer resin through a screw extruder, melting and plasticizing it. The material is then precisely metered by a metering pump and fed to a spinneret. High-speed, high-pressure hot air flows through the spinneret, where it is drawn into ultrafine fibers and collected on a collection device. The fibers can range in diameter from 1 to 5 microns. These ultrafine fibers, with their unique capillary structure, increase the fiber count and surface area per unit area, resulting in excellent filtration, shielding, thermal insulation, and oil absorption properties. It is widely used in medical and industrial masks, medical and sanitary materials, filter materials, isolation materials, oil absorbent materials, thermal insulation materials, and wipes. However, in daily life, humans face the threat of various microbial and viral infections. Current meltblown fabrics, which offer only filtration properties, are no longer sufficient to meet these demands. A meltblown fabric with strong antimicrobial and long-lasting antibacterial properties is needed.

[0003] CN111334930A discloses a graphene meltblown fabric, a manufacturing process, and protective equipment. Graphene powder is dispersed and adhered within the meltblown fabric fibers. The adhesion occurs by partially embedding the graphene powder particles within the meltblown fabric fibers, or by bonding the graphene powder to the surface of the meltblown fabric fibers, or by bonding the graphene powder to and coating the fibers. The graphene meltblown fabric, when combined with non-woven fabrics, can be used to manufacture graphene meltblown protective equipment. The invention has high adsorption and filtration properties, can more effectively remove harmful gases, prevent static electricity generation, is tear-resistant, and has improved anti-toxic and antibacterial effects.

[0004] CN112746396A discloses an antibacterial meltblown cloth for disposable medical masks and a preparation method thereof; the antibacterial meltblown cloth for disposable medical masks includes a slow-release antibacterial layer and a meltblown layer, and the slow-release antibacterial layer contains chitosan, sodium alginate and chlorogenic acid; the preparation method is: polypropylene and maleic anhydride grafted polypropylene are melt-drawn and laid to form a meltblown layer, and then a slow-release antibacterial liquid prepared from the slow-release antibacterial layer is sprayed on the meltblown layer to obtain the antibacterial meltblown cloth for disposable medical masks.

[0005] However, the antibacterial materials used in the meltblown cloth obtained above mostly only have a filtering or adsorption effect on bacteria, viruses and other microorganisms, and the killing effect is not ideal. Therefore, there is an urgent need to develop an antibacterial and antiviral material and antibacterial and antiviral meltblown cloth with low cost, good antibacterial and antiviral properties and harmless to the human body during use to meet application needs. Summary of the Invention

[0006] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide an antibacterial and antiviral masterbatch, its preparation method and application.

[0007] To achieve the purpose of this invention, the following technical solutions are adopted:

[0008] In the first aspect, the present invention provides an antibacterial and antiviral masterbatch. The components of the antibacterial and antiviral masterbatch include, by weight: 50 - 65 parts of polypropylene, 20 - 32 parts of polyethylene terephthalate, 3 - 8 parts of antibacterial and antiviral agent, 1 - 5 parts of surfactant, and 0.1 - 0.5 parts of dispersant.

[0009] In the antibacterial and antiviral masterbatch of the present invention, polypropylene and polyethylene terephthalate are used as the base materials. Mixing the antibacterial and antiviral agent, surfactant and dispersant in the base materials can make the antibacterial and antiviral agent disperse more uniformly in the base materials, and at the same time improve the stability of the antibacterial and antiviral agent, which helps to improve the antibacterial effect of the prepared antibacterial and antiviral masterbatch. Experimental data show that this masterbatch has significant inhibitory and inactivating effects on common bacteria (such as Escherichia coli, Staphylococcus aureus) and viruses (such as influenza virus, coronavirus, etc.). The antibacterial rate can reach more than 99%, and the antiviral activity meets the requirements of industry standards. In addition, due to the loading and coating effect of the base materials on the antibacterial and antiviral agent, the antibacterial and antiviral agent has a certain slow - release effect, that is, it helps to improve the persistence of the antibacterial and antiviral effect of the prepared masterbatch. After testing, the fibers or plastic products prepared from this masterbatch can still maintain high antibacterial and antiviral activity after multiple washings or frictions, and are suitable for medical, household and packaging materials for long - term use.

[0010] In the antibacterial and antiviral masterbatch of the present invention, the addition amount of polypropylene can be 51 parts, 52 parts, 53 parts, 54 parts, 55 parts, 56 parts, 57 parts, 58 parts, 59 parts, 60 parts, 61 parts, 62 parts, 63 parts or 64 parts, etc.;

[0011] The addition amount of polyethylene terephthalate can be 21 parts, 22 parts, 23 parts, 24 parts, 25 parts, 26 parts, 27 parts, 28 parts, 29 parts, 30 parts or 31 parts, etc.;

[0012] The addition amount of the antibacterial and antiviral agent can be 3 parts, 3.5 parts, 4 parts, 4.5 parts, 5 parts, 5.5 parts, 6 parts, 6.5 parts, 7 parts, 7.5 parts or 8 parts, etc.;

[0013] The addition amount of the surfactant can be 1 part, 1.5 parts, 2 parts, 2.5 parts, 3 parts, 3.5 parts, 4 parts, 4.5 parts or 5 parts;

[0014] The addition amount of the dispersant can be 0.1 part, 0.2 part, 0.3 part, 0.4 part or 0.5 part, etc.

[0015] Preferably, the mass ratio of the polypropylene, polyethylene terephthalate and the antibacterial and antiviral agent is (10 - 11):(4 - 5):(0.8 - 1).

[0016] In the present invention, when the ratio of the polypropylene, polyethylene terephthalate and the antibacterial and antiviral agent is within the above range, not only can the antibacterial and antiviral effect of the masterbatch be better, but also the preparation cost of the masterbatch can be reduced. For example, if the dosage of the antibacterial and antiviral agent is too high, the improvement of the antibacterial and antiviral effect of the masterbatch is not obvious, but because the price of the antibacterial and antiviral agent is expensive, the preparation cost of the masterbatch will be increased; while when the dosage of the antibacterial and antiviral agent is too low, the antibacterial and antiviral effect of the masterbatch is poor. Through experimental verification, when the ratio of PP / PET to the antibacterial and antiviral agent is controlled within a certain range, the antibacterial and antiviral agent can fully exert its activity, so that the antibacterial rate of the masterbatch (such as against Escherichia coli and Staphylococcus aureus) reaches more than 99%, while avoiding the excessive use of expensive additives and significantly reducing the production cost. Critical concentration effect: It is found that when the addition amount of the antibacterial and antiviral agent exceeds a certain threshold, the improvement of the antibacterial performance tends to level off, while the cost increases significantly; while when it is lower than the minimum effective concentration (such as 1wt%), the antibacterial effect is insufficient. The ratio of the present invention accurately falls within the optimal activity range, ensuring high efficiency and economy.

[0017] Among them, "10 - 11" can be 10.1, 10.2, 10.3, 10.4, 10.5, 10.6, 10.7, 10.8 or 10.9, etc.;

[0018] "4 - 5" can be 4.1, 4.2, 4.3, 4.4, 4.5, 4.6, 4.7, 4.8 or 4.9, etc.;

[0019] "0.8 - 1" can be 0.82, 0.84, 0.86, 0.88, 0.9, 0.92, 0.94, 0.96 or 0.98, etc.

[0020] Preferably, the antibacterial and antiviral agent includes any one or a combination of at least two of nano silver, nano zinc oxide, nano bismuth tungstate, nano tin oxide, nano cerium oxide, silver and zinc loaded on graphene oxide, silver - doped nano bismuth tungstate, and silver - doped nano titanium dioxide.

[0021] Preferably, the antibacterial and antiviral agent is a combination of nano cerium oxide, silver and zinc loaded on graphene oxide, and silver - doped nano bismuth tungstate.

[0022] In the present invention, nano-ceria can release metal ions, react with proteins on bacterial proteins, affect their functions, and thus produce an antibacterial effect. After the metal oxide is made into nanoparticles, the size is smaller, the affinity with pathogens is enhanced, and the antibacterial efficiency is higher; nano-bismuth tungstate can form peroxide ions and hydroxide ions under light, and undergo a strong oxidation reaction after contacting bacteria and viruses to play a bactericidal role. After doping with silver, the synthesis ability of oxidizing ions in nano-bismuth tungstate is enhanced, and the killing ability against pathogenic microorganisms is stronger; graphene oxide loaded with silver and zinc has antibacterial properties. It can not only damage the bacterial cell membrane through contact cutting, but also destroy the cell membrane and kill bacteria by directly extracting a large amount of phospholipid molecules on the cell membrane. By loading silver and zinc ions antibacterial agents on graphene oxide, the advantages of graphene oxide and silver and zinc can be combined to improve the antibacterial performance. The above three substances cooperate with each other to produce a synergistic gain effect, which is effective against Gram-positive bacteria (such as Staphylococcus aureus), Gram-negative bacteria (such as Escherichia coli), fungi (such as Candida albicans) and enveloped viruses (such as influenza virus), and the material stability is relatively high, which can achieve long-term antibacterial and antiviral effects, and has higher application value.

[0023] Preferably, the mass ratio of the nano-ceria, graphene oxide loaded with silver and zinc, and silver-doped nano-bismuth tungstate is (3 - 5):(2 - 3):(1 - 2).

[0024] Among them, "3 - 5" can be 3.2, 3.4, 3.6, 3.8, 4, 4.2, 4.4, 4.6 or 4.8, etc.;

[0025] "2 - 3" can be 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8 or 2.9, etc.;

[0026] "1 - 2" can be 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8 or 1.9, etc.

[0027] Preferably, the surfactant is any one or a combination of at least two of glyceryl monostearate, sorbitan monooleate, polyoxyethylene sorbitan stearate, and fatty acid polyoxyethylene ether.

[0028] Preferably, the dispersant is any one or a combination of at least two of vinyltriethoxysilane, vinyltrimethoxysilane, and methacryloxypropyltrimethoxysilane.

[0029] Other specific point values within the above numerical ranges can be selected, and will not be elaborated one by one here.

[0030] Second aspect, the present invention provides a method for preparing the antibacterial and antiviral masterbatch as described in the first aspect, the method comprising blending polypropylene, polyethylene terephthalate, antibacterial and antiviral agent, surfactant, and dispersant, and then extruding, pelletizing, and drying to obtain the product.

[0031] Preferably, the extrusion is carried out in a twin-screw extruder.

[0032] Preferably, the granulation barrel temperature of the twin-screw extruder is 100 - 120 °C, for example, it can be 102 °C, 105 °C, 1.8 °C, 110 °C, 112 °C, 115 °C, or 118 °C, etc.

[0033] Preferably, the die head temperature of the twin-screw extruder is 130 - 150 °C, for example, it can be 132 °C, 135 °C, 138 °C, 140 °C, 142 °C, 145 °C, or 148 °C, etc.

[0034] Preferably, the drying temperature is 80 - 100 °C, for example, it can be 82 °C, 85 °C, 88 °C, 90 °C, 92 °C, 95 °C, or 98 °C, etc.

[0035] Other specific point values within the above numerical ranges can be selected and will not be elaborated one by one here.

[0036] Third aspect, the present invention provides an antibacterial and antiviral meltblown fabric, and the raw materials for preparing the antibacterial and antiviral meltblown fabric include 1 - 10 parts by weight of the antibacterial and antiviral masterbatch as described in the first aspect, 30 - 90 parts of a high molecular polymer, and 0.1 - 1 part of a dispersant.

[0037] The antibacterial and antiviral meltblown fabric provided by the present invention can better disperse the antibacterial and antiviral masterbatch in the high molecular polymer through the synergistic cooperation of the antibacterial and antiviral masterbatch, dispersant, and high molecular polymer, thereby enabling the meltblown fabric to have broad-spectrum antibacterial and antiviral properties.

[0038] In the antibacterial and antiviral meltblown fabric of the present invention, the addition amount of the antibacterial and antiviral masterbatch can be 2 parts, 3 parts, 4 parts, 5 parts, 6 parts, 7 parts, 8 parts, or 9 parts, etc.;

[0039] The addition amount of the high molecular polymer can be 35 parts, 40 parts, 45 parts, 50 parts, 55 parts, 60 parts, 65 parts, 70 parts, 75 parts, 80 parts, or 85 parts, etc.;

[0040] The addition amount of the dispersant can be 0.2 parts, 0.3 parts, 0.4 parts, 0.5 parts, 0.6 parts, 0.7 parts, 0.8 parts, or 0.9 parts, etc.

[0041] Preferably, the high molecular polymer includes polypropylene and / or polyethylene terephthalate.

[0042] Preferably, the polymer is polypropylene and polyethylene terephthalate.

[0043] Preferably, the mass ratio of the polypropylene to the polyethylene terephthalate is 1:(0.3 - 0.5), and can be, for example, 1:0.32, 1:0.34, 1:0.36, 1:0.38, 1:0.4, 1:0.42, 1:0.46 or 1:0.48, etc.

[0044] Preferably, the dispersant includes any one or a combination of at least two of polyethylene wax, polypropylene wax or polystyrene wax.

[0045] Other specific point values within the above numerical ranges can be selected, and will not be elaborated one by one here.

[0046] In a fourth aspect, the present invention provides a method for preparing the antibacterial and antiviral meltblown fabric as described in the third aspect. The preparation method includes mixing the antibacterial and antiviral masterbatch as described in the first aspect, the polymer and the dispersant, melting and then extruding and spinning, and laying a web to obtain the product.

[0047] Preferably, the melting temperature is 210 - 240 °C, and can be, for example, 212 °C, 214 °C, 216 °C, 218 °C, 220 °C, 222 °C, 224 °C, 226 °C or 228 °C, etc.

[0048] Preferably, the antibacterial and antiviral masterbatch and the polymer are respectively dried before mixing.

[0049] Preferably, the water contents of the antibacterial and antiviral masterbatch and the polymer after drying are respectively and independently ≤ 400 ppm, and can be, for example, 50 ppm, 100 ppm, 150 ppm, 200 ppm, 250 ppm, 300 ppm or 350 ppm, etc.

[0050] Other specific point values within the above numerical ranges can be selected, and will not be elaborated one by one here.

[0051] Compared with the prior art, the present invention has the following beneficial effects:

[0052] (1) In the antibacterial and antiviral masterbatch of the present invention, using polypropylene and polyethylene terephthalate as the base materials, mixing the antibacterial and antiviral agent, the surfactant and the dispersant in the base materials can make the antibacterial and antiviral agent disperse more uniformly in the base materials, and at the same time can also improve the stability of the antibacterial and antiviral agent, which helps to improve the antibacterial effect of the prepared antibacterial and antiviral masterbatch. In addition, due to the loading and coating effect of the base materials on the antibacterial and antiviral agent, the antibacterial and antiviral agent has a certain slow-release effect, that is, it helps to improve the persistence of the antibacterial and antiviral effect of the prepared masterbatch.

[0053] (2) The present invention provides an antibacterial and antiviral meltblown fabric. Through the cooperation of an antibacterial and antiviral masterbatch, a polymer, and a dispersant, the meltblown fabric has good antibacterial, mildew-proof, and antiviral effects. After testing, the antibacterial rate of the antibacterial and antiviral meltblown fabric against Staphylococcus aureus is higher than 99%, the antibacterial rate against Candida albicans is higher than 99%, the antibacterial rate against Escherichia coli is higher than 99%, and the antiviral rate is higher than 99%. Detailed implementation mode

[0054] To further elaborate on the technical means and effects adopted by the present invention, the following further illustrates the technical solution of the present invention in conjunction with the preferred embodiments of the present invention. However, the present invention is not limited to the scope of the embodiments.

[0055] In the embodiment of the present invention, nano-ceria is purchased from Qinghe Yaoxie Metal Materials Co., Ltd.;

[0056] Silver-zinc loaded graphene oxide is purchased from Zhuhai Dongsheng Huigu New Material Technology Co., Ltd.;

[0057] Silver-doped bismuth tungstate nanowires are purchased from Xianfeng Nano;

[0058] Polyethylene terephthalate is purchased from Shenzhen Hansen Plastic Technology Co., Ltd.;

[0059] Vinyltriethoxysilane is purchased from Guangzhou Zhongjie Chemical Technology Co., Ltd.;

[0060] Polypropylene is purchased from Shandong Gaochuang Hengda New Building Materials Technology Co., Ltd.;

[0061] The remaining raw materials can be used as long as they are purchased from regular distributors.

[0062] Example 1

[0063] This embodiment provides an antibacterial and antiviral masterbatch. The components of the antibacterial and antiviral masterbatch include 55 parts of polypropylene, 25 parts of polyethylene terephthalate, 5 parts of an antibacterial and antiviral agent, 3 parts of glycerol monostearate, and 0.3 parts of vinyltriethoxysilane.

[0064] The antibacterial and antiviral agent is nano-ceria, silver-zinc loaded graphene oxide, and silver-doped bismuth tungstate nanowires with a mass ratio of 2:1:1.

[0065] The preparation method of the antibacterial and antiviral masterbatch includes the following steps:

[0066] Mix polypropylene, polyethylene terephthalate, the antibacterial and antiviral agent, glycerol monostearate, and vinyltriethoxysilane, and then extrude them in a twin-screw extruder. The temperature of the granulation barrel of the twin-screw extruder is 110 °C, the temperature of the die head is 140 °C, and after pelletizing, it is dried at 95 °C to obtain the product.

[0067] Example 2

[0068] This example provides an antibacterial and antiviral masterbatch. The components of the antibacterial and antiviral masterbatch include 60 parts of polypropylene, 30 parts of polyethylene terephthalate, 6 parts of antibacterial and antiviral agent, 4 parts of sorbitan monooleate, and 0.5 part of vinyltrimethoxysilane.

[0069] The antibacterial and antiviral agent is nano-ceria, silver-zinc loaded graphene oxide, and silver-doped nano-bismuth tungstate with a mass ratio of 5:2.5:1.5.

[0070] The preparation method of the antibacterial and antiviral masterbatch includes the following steps:

[0071] Mix polypropylene, polyethylene terephthalate, antibacterial and antiviral agent, surfactant, and dispersant, and then extrude in a twin-screw extruder. The granulation barrel temperature of the twin-screw extruder is 100 °C, the die head temperature is 145 °C, and after pelletizing, dry at 90 °C to obtain the product.

[0072] Example 3

[0073] This example provides an antibacterial and antiviral masterbatch. The components of the antibacterial and antiviral masterbatch include 55 parts of polypropylene, 20 parts of polyethylene terephthalate, 4 parts of antibacterial and antiviral agent, 1 part of polyoxyethylene sorbitan monostearate, 2 parts of fatty acid polyoxyethylene ether, and 0.4 part of methacryloxypropyltrimethoxysilane.

[0074] The antibacterial and antiviral agent is nano-ceria, silver-zinc loaded graphene oxide, and silver-doped nano-bismuth tungstate with a mass ratio of 3:3:1.

[0075] The preparation method of the antibacterial and antiviral masterbatch includes the following steps:

[0076] Mix polypropylene, polyethylene terephthalate, antibacterial and antiviral agent, surfactant, and dispersant, and then extrude in a twin-screw extruder. The granulation barrel temperature of the twin-screw extruder is 115 °C, the die head temperature is 135 °C, and after pelletizing, dry at 85 °C to obtain the product.

[0077] Example 4

[0078] This example provides an antibacterial and antiviral masterbatch. The difference between the antibacterial and antiviral masterbatch in this example and that in Example 1 is only that the antibacterial and antiviral agent is nano-ceria and silver-zinc loaded graphene oxide with a mass ratio of 2:1, and the addition amount of the antibacterial and antiviral agent remains unchanged, and the other components are the same as those in Example 1. The preparation method refers to Example 1.

[0079] Example 5

[0080] This embodiment provides an antibacterial and antiviral masterbatch. The difference between this antibacterial and antiviral masterbatch and that of Example 1 is only that the antibacterial and antiviral agent is cerium oxide nanoparticles and silver-doped bismuth tungstate with a mass ratio of 2:1, and the addition amount of the antibacterial and antiviral agent remains unchanged. The remaining components are the same as those in Example 1, and the preparation method refers to Example 1.

[0081] Example 6

[0082] This embodiment provides an antibacterial and antiviral masterbatch. The difference between this antibacterial and antiviral masterbatch and that of Example 1 is only that the antibacterial and antiviral agent is silver-zinc loaded on graphene oxide and silver-doped bismuth tungstate with a mass ratio of 1:1, and the addition amount of the antibacterial and antiviral agent remains unchanged. The remaining components are the same as those in Example 1, and the preparation method refers to Example 1.

[0083] Example 7

[0084] This embodiment provides an antibacterial and antiviral masterbatch. The difference between this antibacterial and antiviral masterbatch and that of Example 1 is only that the addition amount of the antibacterial and antiviral agent is 10 parts, and the remaining components are the same as those in Example 1. The preparation method refers to Example 1.

[0085] Example 8

[0086] This embodiment provides an antibacterial and antiviral masterbatch. The difference between this antibacterial and antiviral masterbatch and that of Example 1 is only that the addition amount of the antibacterial and antiviral agent is 2 parts, and the remaining components are the same as those in Example 1. The preparation method refers to Example 1.

[0087] Application Example 1

[0088] This application example provides an antibacterial and antiviral meltblown fabric. The preparation raw materials of the antibacterial and antiviral meltblown fabric are as follows by weight: 5 parts of the antibacterial and antiviral masterbatch of Example 1, 55 parts of polypropylene, 25 parts of polyethylene terephthalate, and 0.5 part of polyethylene wax.

[0089] The preparation method of the antibacterial and antiviral meltblown fabric is as follows:

[0090] Dry the antibacterial and antiviral masterbatch, and the water content after drying is 300 ppm; dry the high molecular polymer, and the water content after drying is 300 ppm;

[0091] Mix the dried antibacterial and antiviral masterbatch and high molecular polymer with a dispersant, conduct a melting treatment at 220 °C, and then perform extrusion spinning and web laying to obtain the meltblown fabric.

[0092] Application Examples 2 - 8

[0093] This application example provides 7 kinds of antibacterial and antiviral meltblown fabrics. The difference between the antibacterial and antiviral meltblown fabric and Application Example 1 is only that the antibacterial and antiviral masterbatch in Example 1 is replaced with the antibacterial and antiviral masterbatches prepared in Examples 2-7, and the addition amount of the antibacterial and antiviral masterbatch is kept unchanged, and the other components are the same as those in Application Example 1, and the preparation method refers to Application Example 1.

[0094] Comparative Application Example 1

[0095] This comparative application example provides a meltblown fabric. The difference between the meltblown fabric and Application Example 1 is only that the preparation raw materials do not include the antibacterial and antiviral masterbatch, and the other components are the same as those in Application Example 1, and the preparation method refers to Application Example 1.

[0096] Test Example 1:

[0097] The antibacterial and antiviral activities and antibacterial rates of the antibacterial and antiviral meltblown fabrics provided in Application Examples 1-8 and Comparative Application Example 1 of the present invention were tested. The results are shown in Table 1.

[0098] Among them, the antibacterial rate was carried out in accordance with GB / T 20944.3-2008; the antiviral activity test was carried out according to the NASBA detection method in GB / T19440-2004.

[0099] Table 1

[0100]

[0101]

[0102] As can be seen from Table 1, in Examples 1-3, the antibacterial and antiviral agents and promoters specified at the same time were used in combination, and the antibacterial rates of the obtained antibacterial and antiviral meltblown fabrics against Staphylococcus aureus were all higher than 99%, the antibacterial rates against Candida albicans were all higher than 99%, the antibacterial rates against Escherichia coli were all higher than 99%, and the antiviral rates were all higher than 99%. In the meltblown fabric of Comparative Application Example 1, the antibacterial and antiviral masterbatch was not used, and the antibacterial rate of the obtained antibacterial and antiviral meltblown fabric against Staphylococcus aureus was only 30.9%, the antibacterial rate against Candida albicans was only 52.5%, the antibacterial rate against Escherichia coli was only 68.5%, and the highest antiviral rate was only 46.3%. This shows that the meltblown fabric has good antibacterial, antiviral and mildew-proof properties after adding the antibacterial and antiviral masterbatch.

[0103] Compared with Application Example 1, in Application Examples 4-6, the antibacterial and antiviral agents in the added antibacterial and antiviral masterbatch are not the specific combinations selected in the present invention. At this time, the antibacterial and antiviral rates of the obtained antibacterial and antiviral meltblown fabrics are lower than those in Example 1, indicating that the nano-ceria, silver-zinc loaded graphene oxide and silver-doped nano-bismuth tungstate in the antibacterial and antiviral agents in the present invention cooperate synergistically, which can affect the antibacterial and antiviral rates of the antibacterial and antiviral meltblown fabric.

[0104] Compared with Application Example 1, when the dosage of the antibacterial and antiviral agent in the antibacterial and antiviral masterbatch in Application Example 7 is excessive, the antibacterial rate and antiviral rate of the obtained antibacterial and antiviral meltblown cloth do not change significantly compared with Example 1, but its dosage is too high, directly resulting in an increase in the cost of the antibacterial and antiviral masterbatch; when the dosage of the antibacterial and antiviral agent in the antibacterial and antiviral masterbatch in Application Example 8 is too small, the antibacterial rate and antiviral rate of the meltblown cloth also decrease, indicating that when the antibacterial and antiviral agent in the present invention is too small, it has a negative impact on the antibacterial rate and antiviral rate of the antibacterial and antiviral meltblown cloth.

[0105] Test Example 2

[0106] Test the antibacterial and antiviral aging time of the antibacterial and antiviral meltblown cloths prepared in Application Examples 1-6.

[0107] Experimental process: Detect the antibacterial rate and antiviral rate of the antibacterial and antiviral meltblown cloth at the time of completion of preparation (0 days), the 7th day after preparation, the 14th day after preparation, and the 28th day after preparation respectively. The detection method is the same as that in Test Example 1, and the results are shown in Table 2.

[0108] Table 2

[0109]

[0110]

[0111]

[0112] As can be seen from Table 2, for the antibacterial and antiviral meltblown cloths obtained in Application Examples 1-3, as time goes by, on the 28th day, the antibacterial rate against Staphylococcus aureus is still higher than 99%, the antibacterial rate against Candida albicans is higher than 99%, the antiviral rate is higher than 99%, and the anti-mold grade is 0. Compared with the 0th day, the antibacterial and antiviral rates decrease less, both not exceeding 1%, indicating that the antibacterial and antiviral effects of the meltblown cloth are more long-lasting.

[0113] In Application Examples 4-6, the antibacterial rate and antiviral rate of the obtained antibacterial and antiviral meltblown cloth decrease significantly, with the lowest decrease value reaching 5% and the highest decrease value being 6.63%, indicating that the combination of nano-ceria, silver-zinc loaded graphene oxide and silver-doped nano-bismuth tungstate selected in the present invention can improve the stability and slow-release effect of the antibacterial and antiviral masterbatch, and achieve long-term antibacterial and antiviral effects.

[0114] The applicant declares that the present invention illustrates the antibacterial and antiviral masterbatch and its preparation method and application through the above-mentioned embodiments. However, the present invention is not limited to the above-mentioned embodiments, that is, it does not mean that the present invention must rely on the above-mentioned embodiments to be implemented. Those skilled in the art should understand that any improvement of the present invention, the equivalent substitution of each raw material of the product of the present invention, the addition of auxiliary components, the selection of specific methods, etc., all fall within the protection scope and the disclosure scope of the present invention.

[0115] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific details in the above-mentioned embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.

[0116] In addition, it should be noted that in the various specific technical features described in the above specific embodiments, they can be combined in any suitable manner without conflict. To avoid unnecessary repetition, the present invention will not further explain various possible combination methods.

Claims

1. An antibacterial and antiviral masterbatch, characterized in that, The components of the antibacterial and antiviral masterbatch include, by weight parts: 50-65 parts of polypropylene, 20-32 parts of polyethylene terephthalate, 3-8 parts of antibacterial and antiviral agent, 1-5 parts of surfactant, and 0.1-0.5 parts of dispersant.

2. The antibacterial and antiviral masterbatch according to claim 1, characterized in that, The mass ratio of polypropylene, polyethylene terephthalate to the antibacterial and antiviral agent is (10-11):(4-5):(0.8-1).

3. The antibacterial and antiviral masterbatch according to claim 1 or 2, characterized in that, The antibacterial and antiviral agent includes any one or a combination of at least two of nano silver, nano zinc oxide, nano bismuth tungstate, nano tin oxide, nano cerium oxide, silver and zinc loaded on graphene oxide, silver doped nano bismuth tungstate, silver doped nano titanium dioxide; Preferably, the antibacterial and antiviral agent is a combination of nano cerium oxide, silver and zinc loaded on graphene oxide and silver doped nano bismuth tungstate; Preferably, the mass ratio of the nano cerium oxide, silver and zinc loaded on graphene oxide and silver doped nano bismuth tungstate is (3-5):(2-3):(1-2).

4. The antibacterial and antiviral masterbatch according to any one of claims 1-3, characterized in that, The surfactant is any one or a combination of at least two of glycerol monostearate, sorbitan monooleate, polyoxyethylene sorbitan stearate, fatty acid polyoxyethylene ether; Preferably, the dispersant is any one or a combination of at least two of vinyltriethoxysilane, vinyltrimethoxysilane, methacryloxypropyltrimethoxysilane.

5. The preparation method of the antibacterial and antiviral masterbatch according to any one of claims 1-4, characterized in that, The method includes blending polypropylene, polyethylene terephthalate, antibacterial and antiviral agent, surfactant, and dispersant, then extruding, pelletizing, and drying to obtain the product.

6. The preparation method according to claim 5, wherein, The extrusion is carried out in a twin-screw extruder; Preferably, the granulation barrel temperature of the twin-screw extruder is 100-120 °C; Preferably, the die head temperature of the twin-screw extruder is 130-150 °C; Preferably, the drying temperature is 80-100 °C.

7. An antibacterial and antiviral meltblown fabric, characterized in that, The raw materials for preparing the antibacterial and antiviral meltblown cloth include, by weight parts: 1-10 parts of the antibacterial and antiviral masterbatch according to any one of claims 1-4, 30-90 parts of high molecular polymer, and 0.1-1 part of dispersant.

8. The antibacterial and antiviral meltblown fabric according to claim 7, characterized in that, The high molecular polymer includes polypropylene and / or polyethylene terephthalate; Preferably, the high molecular polymer is polypropylene and polyethylene terephthalate; Preferably, the mass ratio of polypropylene to polyethylene terephthalate is 1:(0.3-0.5); Preferably, the dispersant includes any one or a combination of at least two of polyethylene wax, polypropylene wax, or polystyrene wax.

9. The preparation method of the antibacterial and antiviral meltblown cloth according to claim 7 or 8, characterized in that, The preparation method includes mixing the antibacterial and antiviral masterbatch according to any one of claims 1-4, high molecular polymer, and dispersant, melting, then extruding and spraying filaments, and laying a net to obtain the product.

10. The preparation method of the antibacterial and antiviral meltblown cloth according to claim 9, characterized in that, The melting temperature is 210-240 °C; Preferably, the antibacterial and antiviral masterbatch and high molecular polymer are respectively dried before mixing; Preferably, the water content of the antibacterial and antiviral masterbatch and high molecular polymer after drying is respectively and independently ≤400 ppm.

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