CN111528553A - Virus-killing mask and preparation method of mask filter layer - Google Patents
Virus-killing mask and preparation method of mask filter layer Download PDFInfo
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- CN111528553A CN111528553A CN202010357035.6A CN202010357035A CN111528553A CN 111528553 A CN111528553 A CN 111528553A CN 202010357035 A CN202010357035 A CN 202010357035A CN 111528553 A CN111528553 A CN 111528553A
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- A—HUMAN NECESSITIES
- A41—WEARING APPAREL
- A41D—OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
- A41D13/00—Professional, industrial or sporting protective garments, e.g. surgeons' gowns or garments protecting against blows or punches
- A41D13/05—Professional, industrial or sporting protective garments, e.g. surgeons' gowns or garments protecting against blows or punches protecting only a particular body part
- A41D13/11—Protective face masks, e.g. for surgical use, or for use in foul atmospheres
- A41D13/1192—Protective face masks, e.g. for surgical use, or for use in foul atmospheres with antimicrobial agent
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- A—HUMAN NECESSITIES
- A41—WEARING APPAREL
- A41D—OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
- A41D31/00—Materials specially adapted for outerwear
- A41D31/04—Materials specially adapted for outerwear characterised by special function or use
- A41D31/30—Antimicrobial, e.g. antibacterial
- A41D31/305—Antimicrobial, e.g. antibacterial using layered materials
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F1/00—General methods for the manufacture of artificial filaments or the like
- D01F1/02—Addition of substances to the spinning solution or to the melt
- D01F1/10—Other agents for modifying properties
- D01F1/103—Agents inhibiting growth of microorganisms
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
- D01F6/44—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds as major constituent with other polymers or low-molecular-weight compounds
- D01F6/46—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds as major constituent with other polymers or low-molecular-weight compounds of polyolefins
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- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
- D04H1/54—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by welding together the fibres, e.g. by partially melting or dissolving
- D04H1/542—Adhesive fibres
- D04H1/544—Olefin series
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- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
- D04H1/54—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by welding together the fibres, e.g. by partially melting or dissolving
- D04H1/56—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by welding together the fibres, e.g. by partially melting or dissolving in association with fibre formation, e.g. immediately following extrusion of staple fibres
Abstract
The invention discloses a virus-killing mask and a preparation method of a mask filter layer, wherein the middle layer of a mask body is at least one layer of melt-blown non-woven fabric made of a virus-killing filter layer, the virus-killing filter layer is made of a polypropylene composite material, and the filter layer is made of the virus-killing polypropylene composite material and comprises the following components in percentage by weight: 95-99% of polypropylene and the balance of nano silver-copper alloy material; the nano silver-copper alloy material is formed by mixing nano silver-copper alloy particles with the particle size of 15 nm-50 nm, copper metal atoms on the outer surface of the alloy material are copper oxide, the content of silver is 40% -80% by weight, and the balance is copper. The virus killing mask has the advantages that the detection shows that the anti-bacterial rate of escherichia coli and staphylococcus aureus which represent conventional strains and the anti-methicillin staphylococcus aureus which represent super bacteria reaches more than 99 percent.
Description
Technical Field
The invention belongs to the technical field of composite filter materials, and particularly relates to a virus-killing mask and a preparation method of a mask filter layer.
Background
In recent years, with the development of economy and the improvement of the living standard of people, the quality requirement of the environment is higher and higher. But while the economy develops, it also brings a series of environmental problems. For example, in the haze weather, the haze mainly comprises sulfur dioxide, nitrogen oxide, inhalable particles and the like, and the micro-particle substances are inhaled into the human body and can bring great harm to the respiratory tract and the lung. There are also SARS virus and novel coronavirus pneumonia, which can be transmitted by various routes such as droplet and contact. Common medical masks can be worn by ordinary people, but medical staff and epidemic prevention staff in hospitals need to prevent blood, body fluid and splash from spreading in the invasive operation process, and particularly need a functional mask capable of killing super bacteria and viruses.
At present, medical masks in China are mainly divided into 3 types: the medical protective mask with the highest protection level, the medical surgical mask commonly used in invasive operation environments such as operating rooms and the like and the disposable medical mask with the common level. Medical surgical masks are typically made of three layers of nonwoven fabric. The material is spun-bonded non-woven fabric, melt-blown non-woven fabric and spun-bonded non-woven fabric. The skin touch feeling can also be improved by replacing one layer with staple fibers, namely ES hot-rolled non-woven fabric, melt-blown non-woven fabric and spun-bonded non-woven fabric. The outer layer of the mask is provided with a foam flying prevention design, the middle layer is used for filtering, and the inner storage absorbs moisture. Meltblown fabrics are generally selected to be 20 grams in weight. The N95 cup-shaped mask is composed of needled cotton, melt-blown fabric and non-woven fabric, wherein the melt-blown fabric is usually 40 g or even higher, and the thickness of the needled cotton is added, so that the mask looks thicker than a plane mask in appearance, and the protection effect can reach at least 95%.
We generally say that the mask is a non-woven material, which is a relatively woven, non-woven fabric, made up of oriented or random fibres. Specifically, all the raw materials of the mask are Polypropylene (PP), and the medical mask is generally of a multi-layer structure, generally referred to as SMS structure, that is, an outer layer (a single-layer spunbond layer), an intermediate layer (a single-layer or multi-layer meltblown layer), and an inner layer (a single-layer). The main material for filtering virus of medical mask is the intermediate layer filter cloth-melt-blown non-woven fabric which is very fine and has static electricity. The main material of the melt-blown non-woven fabric is polypropylene, and the melt-blown non-woven fabric is superfine electrostatic fiber cloth and can capture dust. After the spray containing the pneumovirus is close to the melt-blown non-woven fabric, the spray can be electrostatically adsorbed on the surface of the non-woven fabric and cannot permeate, so that the virus protection effect is achieved.
In the prior art, various antibacterial materials are added, and the improvement of the sterilization effect of the mask is hoped. However, the sterilization and virus killing performance of the mask is not ideal enough, and the mask is limited by the performance of an antibacterial material, so that the existing antibacterial mask can only achieve bacteriostasis and cannot kill super bacteria and viruses. Or the existing medical mask adopts multilayer melt-blown materials to improve the virus blocking and filtering efficiency, so that the mask has insufficient air permeability and fluffy degree, and the sterilization, virus killing rate, air permeability and fluffy degree are more difficult to realize. This will certainly burden breathing and work pressure in a highly stressful and long-term heavy work environment for countless medical personnel.
Therefore, functional innovation is required to be performed on the medical mask, and therefore, the development of the mask with the special virus-killing polypropylene composite material filter layer has very important practical significance for reducing disease transmission and protecting health.
Disclosure of Invention
The invention provides a virus-killing mask and a preparation method of a mask filter layer, the production process is simple and controllable, and the large-scale production is facilitated; compared with the existing filtering material mask, the mask can better inhibit and kill super bacteria and viruses, and a small amount of nano silver-copper alloy powder material is added, so that the effect of more than 99 percent of antibacterial rate on escherichia coli and staphylococcus aureus representing conventional strains and methicillin-resistant staphylococcus aureus representing super bacteria is achieved.
In order to achieve the purpose, the invention adopts the technical scheme that:
the utility model provides a gauze mask of killing virus comprises the gauze mask face body and taut area, the gauze mask face body divide into inlayer, intermediate level, skin, characterized in that, the intermediate level is the melt-blown non-woven fabrics that at least one deck was made by the filter layer of killing virus, the filter layer of killing virus comprises polypropylene composite, wherein, polypropylene composite comprises the component of following weight percent:
95 to 99 percent of polypropylene,
the balance of nano silver-copper alloy material,
the nano silver-copper alloy material is formed by mixing nano silver-copper alloy particles with the particle size of 15 nm-50 nm, and copper metal atoms on the outer surface of the alloy material are copper oxide.
Wherein, the middle layer is 1-3 layers of melt-blown non-woven fabrics made of the virus-killing filter layer.
The inner layer is a layer of spun-bonded non-woven fabric, and the outer layer is a layer of spun-bonded non-woven fabric, ES hot-rolled non-woven fabric or needle-punched cotton.
The nano silver-copper alloy particles comprise, by weight, 40% -80% of silver and the balance copper.
Wherein the particle size of the nano silver-copper alloy particles is 15 nm-30 nm.
In another aspect of the present invention, a method for preparing a filter layer of the virus-killing mask comprises the steps of:
s01, preparing a composite metal wire rod by combining metal silver and copper, wherein the silver accounts for 40-80% by weight, and the balance is copper;
s02, forming an electric arc with the cathode by taking the composite metal wire rod as an anode conductor of the direct-current power supply, wherein the temperature of the electric arc is above 5000 ℃, so that the tip of the metal wire rod of the anode conductor is gasified and evaporated to generate a smog-like metal atomic group, and the silver metal atoms and the copper metal atoms are fully mixed to form a gaseous alloy;
s03, cooling the gaseous alloy by supersonic inert gas flow while gasifying the metal;
s04, collecting the powder cooled at normal temperature to obtain nano silver-copper alloy particles;
s05, uniformly mixing the polypropylene master batch and the prepared virus-killing nano silver-copper alloy particles, and granulating by adopting a screw extruder to obtain a virus-killing polypropylene composite material;
s06, feeding the virus-killing polypropylene composite material through a melt-blowing device, melt-extruding, forming fibers, cooling the fibers, forming a net, and reinforcing the net into cloth to obtain the virus-killing filter layer.
Wherein, the step S01 specifically includes: the metallic silver and the copper wire are woven and rolled into the metallic wire rod.
Wherein the supersonic inert gas flow in the step S03 is a helium gas flow with 1-1.4 times of the speed of sound.
Wherein the step S03 further includes: mixing the cooled alloy and inert gas flow with air, and feeding the mixture into a powder collecting device through a pipeline for gas-solid separation. The gas-solid separation step is realized by forming a soft agglomeration effect through electrostatic adsorption of a filter layer, and the filter layer is charged by an electrode to obtain the electrostatic adsorption capacity. The filtering material in the filtering layer is a copolymer of polytetrafluoroethylene and propylene or a copolymer of fluoroethylene and propylene.
Wherein the particle size of the prepared nano silver-copper alloy particles is 15 nm-50 nm, and the particle size of the polypropylene master batch is 1-5 mu m.
Wherein the fiber diameter of the melt-blown material obtained in the step S06 is 1-5 μm.
Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages:
1. the invention adopts the virus killing polypropylene composite material as the filtering layer of the mask, and the melt-blown non-woven fabric is added with specific nano silver-copper alloy powder particles in the polypropylene material as a sterilizing and virus killing agent, has better sterilizing effect than the prior natural antibacterial agent, organic antibacterial agent and inorganic antibacterial agent, and can block and kill super bacteria and virus.
2. The preparation method of the filter layer of the virus-killing mask has the advantages that the formula design is more simplified, only two inorganic antibacterial materials of silver and copper are adopted, the granularity of the prepared nano silver-copper alloy powder is smaller and is only 15-50nm, the uniformity is better, and the consistency of the particle size reaches about 95%. The smaller the particle size of the nano alloy particles prepared by the method is, the more the number of metal atoms exposed on the surface is, the stronger the sterilization capability and the virus killing capability are, and the better the virus killing performance of the prepared polypropylene composite material filter layer is.
3. The preparation method of the virus killing mask filter layer of the invention changes supersonic cooling air in the prior art into supersonic inert gas such as helium for cooling, cools gaseous alloy through supersonic inert gas flow, oxidizing at natural normal temperature to effectively prevent the atomic agglomeration of silver metal and obtain the alloy material of nano silver metal and nano copper metal, when the powder is cooled, separated and collected at normal temperature, only the copper metal atoms exposed on the outer surface can be oxidized (the copper metal atoms inside are not oxidized), and the silver metal atoms are not oxidized, so that the nano silver-copper alloy material has better conductivity and sterilization performance, the more excellent the conductivity of the material is, the stronger the interference capability on the biological electric field of the microorganism is, so that the capability of killing the microorganism is stronger, and the super bacteria and viruses can be further killed. In addition, the copper metal atoms on the outer surface of the nano silver-copper alloy material are oxides, so that the dangerous characteristics of insecurity, easy combustion and explosion of copper metal powder are eliminated, and the safety of the nano silver-copper alloy material in application is ensured. The virus-killing filter layer and the mask made of the virus-killing filter layer can only adopt one intermediate layer on the basis of guaranteeing the remarkable effect of preventing and killing super bacteria and viruses, avoid the defects of insufficient air permeability and insufficient filling power caused by the fact that the antibacterial rate is improved by using multiple layers of melt-blown cloth in the prior art, and realize the consideration of the sterilization rate, the virus-killing rate, the air permeability and the filling power.
4. The virus killing mask using the special filter layer is tested by an authority, and the antibacterial rate of escherichia coli and staphylococcus aureus representing conventional strains and methicillin-resistant staphylococcus aureus representing super bacteria is over 99 percent.
Drawings
FIG. 1 is a flow chart of the preparation process of the filtration layer of the virus-killing mask of the present invention.
Fig. 2 is a picture of the nano silver-copper alloy powder of the mask filter layer material used in the present invention magnified by a scanning electron microscope by a hundred thousand times.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The utility model provides a gauze mask of killing virus comprises the gauze mask face body and taut area, the gauze mask face body divide into inlayer, intermediate level, skin, characterized in that, the intermediate level is the melt-blown non-woven fabrics that at least one deck was made by the filter layer of killing virus, the filter layer of killing virus comprises polypropylene composite, wherein, polypropylene composite comprises the component of following weight percent:
95 to 99 percent of polypropylene,
the balance of nano silver-copper alloy material,
the nano silver-copper alloy material is formed by mixing nano silver-copper alloy particles with the particle size of 15 nm-50 nm, and copper metal atoms on the outer surface of the alloy material are copper oxide.
Wherein, the mask body is divided into an inner layer, a middle layer and an outer layer, the inner layer is made of skin-friendly materials and can be common sanitary gauze or non-woven fabrics; at least one of the middle layer or the outer layer is a filter layer made of a virus-killing polypropylene composite material.
In a preferred embodiment, the middle layer is 1-3 layers of melt-blown non-woven fabric made of the virucidal filter layer, preferably, the middle layer is 1 layer of filter layer melt-blown non-woven fabric made of virucidal polypropylene composite material, and can also be 2 layers or 3 layers.
In a preferred embodiment, the inner layer is a layer of spunbonded nonwoven and the outer layer is a layer of spunbonded nonwoven, ES spunlace or needle punched cotton. .
In a preferred embodiment, the nano silver-copper alloy particles comprise, by weight, 40% to 80% of silver and the balance copper.
In a preferred embodiment, the particle size of the nano silver-copper alloy particles is 15nm to 30 nm.
On the other hand, the preparation method of the filter layer of the virucidal mask, as shown in fig. 1, comprises the following steps:
s01, preparing the composite metal wire rod by combining the metal silver and the copper, wherein the silver accounts for 40-80% by weight, and the balance is copper.
In a preferred embodiment, the metal silver and the metal copper wire are woven and rolled into the composite metal wire rod, wherein the silver accounts for 60-80% by weight, and the balance is copper.
S02, forming an electric arc with the cathode by taking the composite metal wire rod as an anode conductor of the direct-current power supply, wherein the temperature of the electric arc is above 5000 ℃, so that the tip of the metal wire rod of the anode conductor is gasified and evaporated to generate a smog-like metal atom group, and the silver metal atoms and the copper metal atoms are fully mixed to form a gaseous alloy.
In a preferred embodiment, the composite metal wire rod is used as an anode conductor of a direct current power supply to form an electric arc with a cathode, the temperature of the electric arc is more than 5000 ℃, the tip of the metal wire rod of the anode conductor is gasified and evaporated to generate smog-shaped metal atom groups, and silver metal atoms and copper metal atoms are fully mixed to form gaseous alloy.
S03, cooling the gaseous alloy with supersonic inert gas flow while gasifying the metal.
In a preferred embodiment, the supersonic inert gas flow is helium gas flow with the speed of 1-1.4 times of the speed of sound, and is more preferably helium gas flow with the speed of 1-1.3 times of the speed of sound. It will be understood by those skilled in the art that other inert gases including, but not limited to helium, neon, argon, etc. are also within the scope of the present invention.
In a preferred embodiment, the method further comprises the step of mixing the cooled nano silver-copper alloy and inert gas flow with air, and feeding the mixture into a powder collecting device through a pipeline for gas-solid separation. Preferably, the gas-solid separation step is realized by forming a soft agglomeration effect through electrostatic adsorption of a filter layer, and the filter layer obtains the electrostatic adsorption capacity by charging the filter layer with an electrode. The filtering material in the filtering layer is a copolymer of polytetrafluoroethylene and propylene or a copolymer of fluoroethylene and propylene.
And S04, collecting the powder cooled at normal temperature to obtain the nano silver-copper alloy particles.
In a preferred embodiment, only the copper metal atoms exposed on the outer surface of the obtained nano silver-copper alloy powder can be oxidized, for example, to copper oxide (the internal copper metal atoms are not oxidized), and the silver metal atoms are not oxidized, so that the nano silver-copper alloy material has better conductivity and bactericidal performance. The more excellent the conductivity of the material is, the stronger the interference capability on the biological electric field of the microorganism is, so that the capability of killing the microorganism is stronger, and the super bacteria and viruses can be further killed. In addition, the copper metal atoms on the outer surface of the nano silver-copper alloy material are oxides, so that the dangerous characteristics of insecurity, easy combustion and explosion of copper metal powder are eliminated, and the safety of the nano silver-copper alloy material in application is ensured.
And S05, uniformly mixing the polypropylene master batch with the prepared virus-killing nano silver-copper alloy particles, and granulating by adopting a screw extruder to obtain the virus-killing polypropylene composite material.
In a preferred embodiment, 95-99% of polypropylene and the balance of nano silver-copper alloy particles are fully mixed according to weight percentage, and a double-screw extruder is adopted for granulation, so that the virucidal polypropylene composite material with the particle size of 1-5 mu m is obtained. The mixing and granulating are conventional techniques in the art, and the prior art and equipment can be fully adopted, which are not described herein.
S06, feeding the virus-killing polypropylene composite material through a melt-blowing device, melt-extruding, forming fibers, cooling the fibers, forming a net, and reinforcing the net into cloth to obtain the virus-killing filter layer.
In a preferred embodiment, the virucidal polypropylene composite material comprises the following components in percentage by weight: 95-99% of polypropylene and the balance of 15-50nm nano silver-copper alloy particles. Preferably, the nano silver-copper alloy powder comprises, by weight, 40% to 80% of silver and the balance of copper, and more preferably, 60% to 80% of silver and the balance of copper. The copper on the surface of the nano silver-copper alloy particles prepared by the method is in an oxidation state, such as copper oxide; meanwhile, the copper in the nano silver-copper alloy particles is elemental copper. The preparation process of the melt-blown non-woven fabric can completely refer to the prior art and is not described herein.
The preparation process of the nano silver-copper alloy powder material can refer to the earlier invention achievement CN107671303B of the inventor, except for the improved process part. For example, a simplified formula is adopted, and the silver content is 40-80% by weight, and the balance is copper. The step S01 specifically includes: weaving and rolling metal silver and copper wires into a metal wire rod, taking the composite metal wire rod as an anode conductor of a direct-current power supply, and forming an electric arc with a cathode, wherein the temperature of the electric arc is more than 5000 ℃, so that the tip of the composite metal wire rod as the anode conductor is gasified and evaporated to generate a smog-shaped metal atomic group, and the silver metal atoms and the metal copper atoms are fully mixed to form a gaseous alloy; cooling the gaseous alloy by using inert gas flow (such as helium and other inert gases) with the speed of 1-1.4 times of sound, mixing the cooled alloy and the inert gas flow with air, feeding the mixture into a powder collecting device through a pipeline for gas-solid separation, and collecting the cooled powder to obtain the nano silver-copper alloy powder. The particle size of the prepared nano silver-copper alloy powder is 15 nm-50 nm.
Specifically, the preparation method of the nano silver-copper alloy material comprises the following steps:
s1: preparing a metal wire rod: weaving silver metal wires and copper metal wires into mixed metal wires with the diameter of 6-8 mm, and cold rolling and calendering the mixed metal wires into a composite metal wire rod with the diameter of 5 mm;
s2: and (3) gasification: the composite metal wire rod is used as an anode conductor, and forms an electric arc with the cathode at the temperature of more than 5000 ℃ and the length of 30mm under the conditions of direct current voltage of 36V and current of 1050A, so that the tip of the metal wire rod of the anode conductor is gasified and evaporated to generate smog-like metal atomic groups, and silver metal atoms and copper atoms are fully mixed to form a gaseous alloy;
s3: condensation: along with metal gasification, separating the gaseous alloy from a high-temperature area by using an inert gas flow with the speed of 1-1.4 times of sound, and rapidly cooling to enable the metal to return to a solid state from a gaseous state to form alloy particles with the diameter of 15-30 nanometers;
s4: collecting: and the inert gas flow carries the alloy particles to enter a filter layer for gas-solid separation and collection, so that the nano silver-copper alloy material is obtained.
Example 1
A preparation method of a virus-killing mask filter layer comprises the following steps:
s01, weaving the silver metal wire and the copper metal wire into a mixed metal wire with the diameter of 6mm, and cold rolling and rolling the mixed metal wire into a composite metal wire rod with the diameter of 5 mm; the silver-copper composite wire comprises 40% of silver and the balance of copper by weight percent, the purities of the metal silver and the copper wire are both 99.9%, and the diameters of the silver metal wire and the copper metal wire are both 0.4 mm.
S02, the composite metal wire rod is used as an anode conductor of a direct current power supply, an electric arc with 5500 ℃ and 30mm length is formed with a cathode under the conditions that direct current voltage is 36V and current is 1050A, the tip of the metal wire rod of the anode conductor is gasified and evaporated, smog-shaped metal atom groups are generated, and silver metal atoms and copper metal atoms are fully mixed to form gaseous alloy.
And S03, cooling the gaseous alloy by using helium inert gas flow with the speed of 1.4 times of sound while gasifying the metal, mixing the cooled nano silver-copper alloy and inert gas flow with air, and feeding the mixture into a powder collecting device through a pipeline for gas-solid separation.
And S04, collecting the powder cooled at normal temperature to obtain the nano silver-copper alloy particles.
S05, stirring and uniformly mixing the polypropylene master batch and the prepared virus-killing nano silver-copper alloy powder at a high speed according to the proportion of 95wt% of polypropylene and 5% of nano silver-copper alloy, so that the dispersed nano silver-copper alloy powder particles are attached to and wrapped on the surface of the polypropylene master batch; and (3) granulating by adopting a double-screw extruder, melting, granulating and molding the mixed powder to obtain the virus-killing polypropylene composite material.
S06, feeding the virus-killing polypropylene composite material through a melt-blowing device, carrying out melt extrusion, forming fibers, cooling the fibers, forming a net, and reinforcing the net into cloth to obtain the virus-killing filter layer non-woven cloth material.
Example 2
A preparation method of a virus-killing mask filter layer comprises the following steps:
s01, weaving the silver metal wire and the copper metal wire into a mixed metal wire with the diameter of 7mm, and cold rolling and rolling the mixed metal wire into a composite metal wire rod with the diameter of 5 mm; the silver-copper wire comprises 60% of silver and the balance of copper by weight, the purities of the metal silver and the copper wire are both 99.9%, and the diameters of the silver metal wire and the copper metal wire are both 0.5 mm.
S02, the composite metal wire rod is used as an anode conductor of a direct current power supply, an electric arc with the temperature of 5800 ℃ and the length of 30mm is formed with a cathode under the conditions that the direct current voltage is 36V and the current is 1050A, the tip of the metal wire rod of the anode conductor is gasified and evaporated, smog-shaped metal atom groups are generated, and silver metal atoms and copper metal atoms are fully mixed to form gaseous alloy.
And S03, cooling the gaseous alloy by using helium inert gas flow with the speed of 1.5 times of sound while gasifying the metal, mixing the cooled nano silver-copper alloy and inert gas flow with air, and feeding the mixture into a powder collecting device through a pipeline for gas-solid separation.
And S04, collecting the powder cooled at normal temperature to obtain the nano silver-copper alloy particles.
S05, stirring and uniformly mixing the polypropylene master batch and the prepared virus-killing nano silver-copper alloy powder at a high speed according to the proportion of 96wt% of polypropylene and 4 wt% of nano silver-copper alloy, so that the dispersed nano silver-copper alloy powder particles are attached to and wrapped on the surface of the polypropylene master batch; and (3) granulating by adopting a double-screw extruder, melting, granulating and molding the mixed powder to obtain the virus-killing polypropylene composite material.
S06, feeding the virus-killing polypropylene composite material through a melt-blowing device, carrying out melt extrusion, forming fibers, cooling the fibers, forming a net, and reinforcing the net into cloth to obtain the virus-killing filter layer non-woven cloth material.
Example 3
A preparation method of a virus-killing mask filter layer comprises the following steps:
s01, weaving the silver metal wire and the copper metal wire into a mixed metal wire with the diameter of 8mm, and cold rolling and rolling the mixed metal wire into a composite metal wire rod with the diameter of 5 mm; the silver-copper wire comprises 40 wt% of silver and the balance of copper, the purities of the metal silver and the copper wire are both 99.9%, and the diameters of the silver metal wire and the copper metal wire are both 0.6 mm.
S02, taking the composite metal wire rod as an anode conductor of a direct current power supply, forming an electric arc with the cathode at 6000 ℃ and 30mm in length under the conditions of 36V direct current voltage and 1050A current, so that the tip of the metal wire rod of the anode conductor is gasified and evaporated to generate a smog-like metal atomic group, and the silver metal atoms and the copper metal atoms are fully mixed to form a gaseous alloy.
And S03, cooling the gaseous alloy by using helium inert gas flow with the speed of 1.3 times of sound while gasifying the metal, mixing the cooled nano silver-copper alloy and inert gas flow with air, and feeding the mixture into a powder collecting device through a pipeline for gas-solid separation.
And S04, collecting the powder cooled at normal temperature to obtain the nano silver-copper alloy particles.
S05, stirring and uniformly mixing the polypropylene master batch and the prepared virus-killing nano silver-copper alloy powder at a high speed according to the proportion of 97wt% of polypropylene and 3% of nano silver-copper alloy, so that the dispersed nano silver-copper alloy powder particles are attached to and wrapped on the surface of the polypropylene master batch; and (3) granulating by adopting a double-screw extruder, melting, granulating and molding the mixed powder to obtain the virus-killing polypropylene composite material.
S06, feeding the virus-killing polypropylene composite material through a melt-blowing device, carrying out melt extrusion, forming fibers, cooling the fibers, forming a net, and reinforcing the net into cloth to obtain the virus-killing filter layer non-woven cloth material.
Example 4
A preparation method of a virus-killing mask filter layer comprises the following steps:
s01, weaving the silver metal wire and the copper metal wire into a mixed metal wire with the diameter of 8mm, and cold rolling and rolling the mixed metal wire into a composite metal wire rod with the diameter of 5 mm; the silver-copper composite wire comprises 80 wt% of silver and the balance of copper, wherein the purities of the metal silver and the copper wire are both 99.9%, and the diameters of the silver metal wire and the copper metal wire are both 0.7 mm.
S02, the composite metal wire rod is used as an anode conductor of a direct current power supply, an electric arc with the temperature of 5250 ℃ and the length of 30mm is formed with a cathode under the conditions that the direct current voltage is 36V and the current is 1050A, the tip of the metal wire rod of the anode conductor is gasified and evaporated, smog-shaped metal atom groups are generated, and silver metal atoms and copper metal atoms are fully mixed to form gaseous alloy.
And S03, cooling the gaseous alloy by using helium inert gas flow with the speed of 1.2 times of sound while gasifying the metal, mixing the cooled nano silver-copper alloy and inert gas flow with air, and feeding the mixture into a powder collecting device through a pipeline for gas-solid separation.
And S04, collecting the powder cooled at normal temperature to obtain the nano silver-copper alloy particles.
S05, stirring and uniformly mixing the polypropylene master batch and the prepared virus-killing nano silver-copper alloy powder at a high speed according to the proportion of 98wt% of polypropylene and 2% of nano silver-copper alloy, so that the dispersed nano silver-copper alloy powder particles are attached to and wrapped on the surface of the polypropylene master batch; and (3) granulating by adopting a double-screw extruder, melting, granulating and molding the mixed powder to obtain the virus-killing polypropylene composite material.
S06, feeding the virus-killing polypropylene composite material through a melt-blowing device, carrying out melt extrusion, forming fibers, cooling the fibers, forming a net, and reinforcing the net into cloth to obtain the virus-killing filter layer non-woven cloth material.
Example 5
A preparation method of a virus-killing mask filter layer comprises the following steps:
s01, weaving the silver metal wire and the copper metal wire into a mixed metal wire with the diameter of 8mm, and cold rolling and rolling the mixed metal wire into a composite metal wire rod with the diameter of 5 mm; the silver-copper wire comprises 60% of silver and the balance of copper by weight, the purities of the metal silver and the copper wire are both 99.9%, and the diameters of the silver metal wire and the copper metal wire are both 0.8 mm.
S02, the composite metal wire rod is used as an anode conductor of a direct current power supply, an electric arc with the temperature of 5650 ℃ and the length of 30mm is formed with a cathode under the conditions that the direct current voltage is 36V and the current is 1050A, the tip of the metal wire rod of the anode conductor is gasified and evaporated, smog-shaped metal atom groups are generated, and silver metal atoms and copper metal atoms are fully mixed to form gaseous alloy.
And S03, cooling the gaseous alloy by using helium inert gas flow with the speed of 1.1 times of sound while gasifying the metal, mixing the cooled nano silver-copper alloy and inert gas flow with air, and feeding the mixture into a powder collecting device through a pipeline for gas-solid separation.
And S04, collecting the powder cooled at normal temperature to obtain the nano silver-copper alloy particles.
S05, stirring and uniformly mixing the polypropylene master batch and the prepared virus-killing nano silver-copper alloy powder at a high speed according to the proportion of 99wt% of polypropylene and 1% of nano silver-copper alloy, so that the dispersed nano silver-copper alloy powder particles are attached to and wrapped on the surface of the polypropylene master batch; and (3) granulating by adopting a double-screw extruder, melting, granulating and molding the mixed powder to obtain the virus-killing polypropylene composite material.
S06, feeding the virus-killing polypropylene composite material through a melt-blowing device, carrying out melt extrusion, forming fibers, cooling the fibers, forming a net, and reinforcing the net into cloth to obtain the virus-killing filter layer non-woven cloth material.
Example 6
A preparation method of a virus-killing mask filter layer comprises the following steps:
s01, weaving the silver metal wire and the copper metal wire into a mixed metal wire with the diameter of 8mm, and cold rolling and rolling the mixed metal wire into a composite metal wire rod with the diameter of 5 mm; the silver-copper composite wire comprises 80 wt% of silver and the balance of copper, wherein the purities of the metal silver and the copper wire are both 99.9%, and the diameters of the silver metal wire and the copper metal wire are both 0.6 mm.
S02, the composite metal wire rod is used as an anode conductor of a direct current power supply, an electric arc with the temperature of 5250 ℃ and the length of 30mm is formed with a cathode under the conditions that the direct current voltage is 36V and the current is 1050A, the tip of the metal wire rod of the anode conductor is gasified and evaporated, smog-shaped metal atom groups are generated, and silver metal atoms and copper metal atoms are fully mixed to form gaseous alloy.
And S03, cooling the gaseous alloy by using a helium inert gas flow with the speed of 1 time of sound while gasifying the metal, mixing the cooled nano silver-copper alloy and the inert gas flow with air, and feeding the mixture into a powder collecting device through a pipeline for gas-solid separation.
And S04, collecting the powder cooled at normal temperature to obtain the nano silver-copper alloy particles.
S05, stirring and uniformly mixing the polypropylene master batch and the prepared virus-killing nano silver-copper alloy powder at a high speed according to the proportion of 97.5wt% of polypropylene and 2.5% of nano silver-copper alloy, so that the dispersed nano silver-copper alloy powder particles are attached to and wrapped on the surface of the polypropylene master batch; and (3) granulating by adopting a double-screw extruder, melting, granulating and molding the mixed powder to obtain the virus-killing polypropylene composite material.
S06, feeding the virus-killing polypropylene composite material through a melt-blowing device, carrying out melt extrusion, forming fibers, cooling the fibers, forming a net, and reinforcing the net into cloth to obtain the virus-killing filter layer non-woven cloth material.
The nano silver-copper alloy powder material obtained in step S04 of example 1 was magnified by a scanning electron microscope at a magnification of one hundred thousand times to obtain fig. 2. As shown in the figure: the particle size of the composite nano material is about 15 nm-50 nm, the composite nano material is a nano silver-copper alloy composite, the uniformity is excellent, and the consistency of the particle size reaches more than 95%.
The filter layer of the virus killing mask prepared by the embodiment of the invention is melt-blown with non-woven fabric material to prepare the mask, and the filter layer of the virus killing mask is adopted in the middle layer of the mask. The antibacterial rate of Escherichia coli and Staphylococcus aureus representing conventional strains and methicillin-resistant Staphylococcus aureus representing super bacteria is more than 99% by the test of an authority.
In conclusion, the virus-killing mask and the filter layer thereof are made of virus-killing polypropylene composite materials, and the formula design of the virus-killing mask is more simplified by adopting nano silver-copper alloy powder particles with 40% -80% of silver and the balance of copper; the nano silver-copper alloy particles are prepared by adopting gasification evaporation, mixing and cooling, and have stronger capability of resisting and killing super bacteria and viruses than the existing natural antibacterial agent, organic antibacterial agent and inorganic antibacterial agent, so that the filtering layer of the virus-killing mask and the mask prepared by the filtering layer can only adopt one intermediate layer on the basis of ensuring the remarkable effect of resisting and killing the super bacteria and the viruses, the defects of insufficient air permeability and insufficient fluffiness caused by the fact that the antibacterial rate is improved by using multiple layers of melt-spraying cloth in the prior art are avoided, and the sterilization, virus-killing rate, the air permeability and the fluffiness are considered at the same time. The particle size of the nano silver-copper alloy powder material prepared by the preparation method of the virus-killing polypropylene composite material of the filter layer material is small, only 15-50nm, the uniformity is better, the consistency of the particle size reaches about 95%, the smaller the particle size of the prepared nano alloy particles is, the more the number of metal atoms exposed on the surface is, the stronger the sterilizing capability and the virus-killing capability are, and the better the super-bacterium and virus-killing performance of the prepared polypropylene composite material is.
The nano silver-copper alloy material has better conductivity and sterilization performance, and the more excellent the conductivity of the material, the stronger the interference capability on the bioelectric field of microorganisms, so the stronger the capability of killing microorganisms, and further, superbacteria and viruses can be killed.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. The utility model provides a gauze mask of killing virus comprises the gauze mask face body and taut area, the gauze mask face body divide into inlayer, intermediate level, skin, characterized in that, the intermediate level is the melt-blown non-woven fabrics that at least one deck was made by the filter layer of killing virus, the filter layer of killing virus comprises polypropylene composite, wherein, polypropylene composite comprises the component of following weight percent:
95 to 99 percent of polypropylene,
the balance of nano silver-copper alloy material,
the nano silver-copper alloy material is formed by mixing nano silver-copper alloy particles with the particle size of 15 nm-50 nm, and copper metal atoms on the outer surface of the alloy material are copper oxide.
2. The virucidal mask as claimed in claim 1, wherein said intermediate layer is 1-3 layers of meltblown nonwoven fabric made from said virucidal filter.
3. The virucidal mask of claim 1 wherein said inner layer is a spunbond nonwoven and said outer layer is a spunbond nonwoven, ES hot rolled nonwoven or needle punched cotton.
4. The virucidal mask as claimed in claim 1, wherein said silver nanoparticles comprise 40-80% silver and the balance copper, by weight.
5. The virucidal mask as claimed in claim 1, wherein the nano silver-copper alloy particles have a particle size of 15nm to 30 nm.
6. A method for preparing a filter layer of a virucidal mask according to any one of claims 1 to 5, comprising the steps of:
s01, preparing a composite metal wire rod by combining metal silver and copper, wherein the silver accounts for 40-80% by weight, and the balance is copper;
s02, forming an electric arc with the cathode by taking the composite metal wire rod as an anode conductor of the direct-current power supply, wherein the temperature of the electric arc is above 5000 ℃, so that the tip of the metal wire rod of the anode conductor is gasified and evaporated to generate a smog-like metal atomic group, and the silver metal atoms and the copper metal atoms are fully mixed to form a gaseous alloy;
s03, cooling the gaseous alloy by supersonic inert gas flow while gasifying the metal;
s04, collecting the powder cooled at normal temperature to obtain nano silver-copper alloy particles;
s05, uniformly mixing the polypropylene master batch and the prepared virus-killing nano silver-copper alloy particles, and granulating by adopting a screw extruder to obtain a virus-killing polypropylene composite material;
s06, feeding the virus-killing polypropylene composite material through a melt-blowing device, melt-extruding, forming fibers, cooling the fibers, forming a net, and reinforcing the net into cloth to obtain the virus-killing filter layer.
7. The method of claim 6, wherein the supersonic inert gas flow in step S03 is a helium flow of 1 to 1.4 times the speed of sound.
8. The method for preparing a filter layer of a virucidal mask as claimed in claim 6, wherein the step S03 further comprises: mixing the cooled alloy and inert gas flow with air, and feeding the mixture into a powder collecting device through a pipeline for gas-solid separation.
9. The method for preparing the filter layer of the antivirus mask according to claim 6, wherein the particle size of the prepared nano silver-copper alloy particles is 15nm to 50nm, and the particle size of the polypropylene master batch is 1 μm to 5 μm.
10. The method of claim 6, wherein the melt-blown material obtained in step S06 has a fiber diameter of 1 to 5 μm.
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| CN112355320A (en) * | 2019-07-25 | 2021-02-12 | 上海沪正实业有限公司 | Nano copper powder and application thereof in preparation of antibacterial and haze-preventing mask |
| CN112538765A (en) * | 2020-11-24 | 2021-03-23 | 佛山市顺德区中辐环保科技有限公司 | Nonwoven fabric with sterilizing and virus removing functions and manufacturing method thereof |
| CN112626717A (en) * | 2020-10-20 | 2021-04-09 | 美洁纳米科技(苏州)有限公司 | Antibacterial and antiviral monovalent copper-carbon composite non-woven fabric and preparation method and application thereof |
| CN112726219A (en) * | 2020-12-28 | 2021-04-30 | 广东广油华丰科技研究有限公司 | Emulsion containing nano cuprous oxide/copper oxide/silver oxide for non-woven fabric and application thereof |
| CN112796038A (en) * | 2020-12-30 | 2021-05-14 | 苏州熔叠科技有限公司 | Antibacterial melt-blown fabric and manufacturing method thereof |
| CN114216303A (en) * | 2021-09-17 | 2022-03-22 | 长春大学 | Preparation method of long-tunnel multi-cavity copper plate exchange recovery low-energy-consumption drying tower |
| US20220096975A1 (en) * | 2020-09-30 | 2022-03-31 | Uchicago Argonne, Llc | Nanofiber Filter Medium for Reusable Facemask and Filtering Facepiece Respirator |
| CN114601216A (en) * | 2022-03-21 | 2022-06-10 | 北京化工大学 | Preparation method of mask capable of resisting virus and decomposing ozone |
| US11375761B2 (en) * | 2020-11-12 | 2022-07-05 | Chi Chen HSIEN | Electrochemical antimicrobial face mask |
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