CN111549446A - Virus-killing non-woven fabric, preparation process thereof and protective clothing using non-woven fabric - Google Patents
Virus-killing non-woven fabric, preparation process thereof and protective clothing using non-woven fabric Download PDFInfo
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- CN111549446A CN111549446A CN202010356072.5A CN202010356072A CN111549446A CN 111549446 A CN111549446 A CN 111549446A CN 202010356072 A CN202010356072 A CN 202010356072A CN 111549446 A CN111549446 A CN 111549446A
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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
- D04H1/42—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 characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
- D04H1/4282—Addition polymers
- D04H1/4291—Olefin series
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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
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/14—Making metallic powder or suspensions thereof using physical processes using electric discharge
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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
- D04H1/56—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
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- Textile Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Physical Education & Sports Medicine (AREA)
- Artificial Filaments (AREA)
Abstract
The invention discloses a virus-killing non-woven fabric, a preparation process thereof and protective clothing using the non-woven fabric, wherein the non-woven fabric is made of a 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 detection shows that the protective clothing using the non-woven fabric of the invention has an antibacterial rate of over 99 percent for escherichia coli and staphylococcus aureus representing conventional strains and methicillin-resistant staphylococcus aureus representing super bacteria.
Description
Technical Field
The invention belongs to the field of non-woven materials, and particularly relates to a virus-killing non-woven fabric, a preparation process thereof and protective clothing using the non-woven fabric.
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. In particular, SARS virus and novel coronavirus, which can be transmitted by various routes such as droplet and contact. For medical care personnel and epidemic prevention personnel in hospitals, the spread of blood, body fluid and splashes needs to be prevented in the invasive operation process, and besides the special mask which can kill super bacteria and viruses is needed, the protective clothing is also very important.
The medical disposable non-woven protective clothing is intensively purchased in a large quantity in the serious events of national resistance to new coronavirus epidemic situation, SARS, avian influenza, Wenchuan earthquake, Olympic Security, H1N1 influenza A and the like, and has short-term structural shortage. The medical disposable non-woven protective clothing is a one-piece structure consisting of a cap, a jacket and trousers, has good moisture permeability and barrier property, can effectively resist the penetration of alcohol, blood, body fluid, air dust particles and bacteria, is safe and convenient to use, can effectively protect a wearer from being threatened by infection, is comfortable to wear, has good hand feeling, strong tensile resistance, air permeability, water resistance, no cross infection and the like.
In some working environments with strong infectivity, medical staff or epidemic prevention staff even need to wear a plurality of layers of protective clothing to ensure the safety of the staff. The bulky protective clothing brings inconvenience to medical staff who work for a long time in a sterile and sealed manner. If a non-woven fabric protective garment with a special virus killing function can be developed, the non-woven fabric protective garment has very important practical significance for reducing virus infection and protecting health.
Disclosure of Invention
The invention provides a virus-killing non-woven fabric, a preparation process thereof and protective clothing using the non-woven fabric, the production process is simple and controllable, and the large-scale production is facilitated; compared with the existing medical disposable non-woven protective clothing, the super-bacteria and virus can be blocked and killed better, and the effect of killing the super-bacteria and the virus rate close to 100 percent can be achieved by adding a small amount of nano composite material.
In order to achieve the purpose, the invention adopts the technical scheme that:
the virus-killing non-woven fabric is characterized by being made of a virus-killing polypropylene composite material, wherein the virus-killing polypropylene composite material comprises the following components in percentage by weight:
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.
The nano silver-copper alloy powder comprises, 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 virus-killing nonwoven fabric, 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, preparing the virus-killing polypropylene composite material into the virus-killing non-woven fabric.
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 1-1.5 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, the particle size of the polypropylene master batch is 1-5 mu m, and the fiber diameter of the melt-blown material obtained in the step S06 is 1-5 mu m.
In another aspect of the invention, the protective clothing made of the virus-killing non-woven fabric is characterized in that the virus-killing non-woven fabric made of virus-killing polypropylene composite materials is used as the surface layer of the protective clothing.
Wherein, the surface layer of the protective clothing comprises at least one layer of the virucidal non-woven fabric made of virucidal polypropylene composite material.
Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages:
1. the invention adopts the virucidal polypropylene composite material to prepare the protective clothing of the non-woven fabric, and the specific nano silver-copper alloy powder particles are adopted as the bactericidal and virucidal agents in the polypropylene base material, so that the protective clothing can inhibit and kill super bacteria and viruses compared with the existing natural antibacterial agent, organic antibacterial agent and inorganic antibacterial agent, and the bactericidal and virucidal effects of the protective clothing are greatly improved.
2. The preparation method of the virus-killing polypropylene composite material adopted by the non-woven fabric is more simplified in formula design, 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 invention relates to a method for preparing virucidal polypropylene composite material for non-woven fabric, which 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 non-woven fabric and the protective clothing made of the virus-killing non-woven fabric can only adopt one or two layers of virus-killing non-woven fabrics on the basis of guaranteeing the remarkable effects of preventing and killing super bacteria and viruses, avoid the defects of insufficient air permeability and insufficient filling power caused by the improvement of antibacterial rate when a plurality of layers of protective clothing are worn in the prior art, and realize the consideration of both the sterilization rate, the virus-killing rate and the air permeability and the filling power.
4. The protective clothing using the special virus-killing non-woven fabric is tested by an authoritative institution, 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 process for preparing the virucidal nonwoven fabric of the present invention.
Fig. 2 is a picture of nano silver-copper alloy powder of the nonwoven fabric 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 protective clothing is made of the virus-killing non-woven fabric, and the virus-killing non-woven fabric made of virus-killing polypropylene composite materials is arranged on the surface layer of the protective clothing. Preferably, the top layer of the protective garment comprises at least one layer of the virucidal nonwoven fabric made of a polypropylene composite, more preferably, the top layer of the protective garment comprises two or three layers of the virucidal nonwoven fabric made of a polypropylene composite.
The preparation method of the virucidal non-woven fabric 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, preparing the virucidal polypropylene composite material into the virucidal non-woven fabric, and preparing the non-woven fabric by a melt-blown or non-melt-blown method, such as other non-woven fabric manufacturing processes of spun bond and the like, preferably, preparing the non-woven fabric by a melt-blown method; wherein the fiber diameter of the prepared melt-blown material is 1-5 μm. The melt-blown device and the melt-blown process can adopt the prior art, and the fiber diameter of the melt-blown material is controlled within the range of the target diameter only by adjusting the aperture of a spinneret plate.
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 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 method for preparing virus-killing non-woven fabric 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, preparing the virucidal polypropylene composite material into virucidal non-woven fabric through a melt-blowing process.
Example 2
A method for preparing virus-killing non-woven fabric 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, preparing the virucidal polypropylene composite material into virucidal non-woven fabric through a melt-blowing process.
Example 3
A method for preparing virus-killing non-woven fabric 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, preparing the virucidal polypropylene composite material into virucidal non-woven fabric through a melt-blowing process.
Example 4
A method for preparing virus-killing non-woven fabric 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, preparing the polypropylene composite material into a virus-killing non-woven fabric through a melt-blowing process.
Example 5
A method for preparing virus-killing non-woven fabric 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, preparing the virucidal polypropylene composite material into virucidal non-woven fabric through a melt-blowing process.
Example 6
A method for preparing virus-killing non-woven fabric 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, preparing the virucidal polypropylene composite material into virucidal non-woven fabric through a melt-blowing process.
The nano silver-copper alloy powder 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 silver-copper composite, the uniformity is excellent, and the consistency of the particle size reaches more than 95%.
The virus-killing non-woven fabric material prepared in the embodiment of the invention is prepared into protective clothing, and the virus-killing non-woven fabric is adopted on the surface layer of the protective clothing. 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 non-woven fabric is made of the virus-killing polypropylene composite material, and the formula design formed by the nano silver-copper alloy powder particles with 40% -80% of silver and the balance of copper is simpler; the nano silver-copper alloy particles are prepared by 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 virus-killing non-woven fabric and the protective clothing prepared by the virus-killing non-woven fabric can adopt only one layer of virus-killing non-woven fabric on the surface of the protective clothing 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 fluffy degree caused by the adoption of multiple layers in the prior art to improve the antibacterial rate are avoided, and the effects of sterilization, virus killing, air permeability and fluffy degree are achieved. The particle size of the nano silver-copper alloy powder prepared by the preparation method of the virus-killing polypropylene composite material of the non-woven fabric is smaller and is only 15-50nm, the uniformity of the nano silver-copper alloy powder is better, the uniformity 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 virus-killing non-woven fabric is characterized by being made of a virus-killing polypropylene composite material, wherein the virus-killing polypropylene composite material comprises the following components in percentage by weight:
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 nonwoven fabric as claimed in claim 1, wherein the nano silver-copper alloy particles comprise, by weight, 40% to 80% silver and the balance copper.
3. The virucidal nonwoven fabric of claim 2, wherein the nano silver-copper alloy particles have a particle size of 15nm to 30 nm.
4. A method of preparing a virucidal nonwoven fabric as claimed in any one of claims 1 to 3, 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, preparing the polypropylene composite material into the virucidal non-woven fabric.
5. The method of claim 4, wherein the supersonic inert gas flow in step S03 is a helium flow of 1-1.4 times sonic speed.
6. The method for preparing a virucidal non-woven fabric according to claim 4, 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.
7. The preparation method of the virucidal non-woven fabric according to claim 4, wherein the particle size of the prepared nano silver-copper alloy particles is 15nm to 50nm, the particle size of the polypropylene master batch is 1 μm to 5 μm, and the fiber diameter of the melt-blown material obtained in the step S06 is 1 μm to 5 μm.
8. The method of claim 4, wherein the step S06 is performed by melt-blowing or non-melt-blowing.
9. A protective garment using the virucidal nonwoven fabric according to any one of claims 1 to 3, wherein the surface layer of the protective garment is the virucidal nonwoven fabric made of a polypropylene composite material.
10. The protective garment according to claim 8, when used according to any one of claims 1 to 3, wherein the top layer of the garment comprises at least one layer of said virucidal nonwoven fabric made of a polypropylene composite.
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| CN113082281A (en) * | 2021-04-07 | 2021-07-09 | 武汉发明家创新科技有限公司 | Copper and/or silver series sterilization medical consumable and manufacturing method thereof |
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Application publication date: 20200818 |