CN111945296A - Antibacterial nano-silver melt-blown cloth for mask and preparation process thereof - Google Patents
Antibacterial nano-silver melt-blown cloth for mask and preparation process thereof Download PDFInfo
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- CN111945296A CN111945296A CN202010838956.4A CN202010838956A CN111945296A CN 111945296 A CN111945296 A CN 111945296A CN 202010838956 A CN202010838956 A CN 202010838956A CN 111945296 A CN111945296 A CN 111945296A
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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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- 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
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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
- D01F2/00—Monocomponent artificial filaments or the like of cellulose or cellulose derivatives; Manufacture thereof
- D01F2/02—Monocomponent artificial filaments or the like of cellulose or cellulose derivatives; Manufacture thereof from solutions of cellulose in acids, bases or salts
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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
- D01F2/00—Monocomponent artificial filaments or the like of cellulose or cellulose derivatives; Manufacture thereof
- D01F2/24—Monocomponent artificial filaments or the like of cellulose or cellulose derivatives; Manufacture thereof from cellulose derivatives
- D01F2/28—Monocomponent artificial filaments or the like of cellulose or cellulose derivatives; Manufacture thereof from cellulose derivatives from organic cellulose esters or ethers, e.g. cellulose acetate
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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
- D04H1/541—Composite fibres, e.g. sheath-core, sea-island or side-by-side; Mixed fibres
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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
- D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
- D04H3/005—Synthetic yarns or filaments
- D04H3/007—Addition polymers
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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
- D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
- D04H3/08—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating
- D04H3/14—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating with bonds between thermoplastic yarns or filaments produced by welding
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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
- D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
- D04H3/08—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating
- D04H3/14—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating with bonds between thermoplastic yarns or filaments produced by welding
- D04H3/153—Mixed yarns or filaments
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M11/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising
- D06M11/73—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with carbon or compounds thereof
- D06M11/74—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with carbon or compounds thereof with carbon or graphite; with carbides; with graphitic acids or their salts
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
- D06M15/01—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with natural macromolecular compounds or derivatives thereof
- D06M15/03—Polysaccharides or derivatives thereof
- D06M15/05—Cellulose or derivatives thereof
- D06M15/09—Cellulose ethers
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
- D06M15/19—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with synthetic macromolecular compounds
- D06M15/37—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D06M15/564—Polyureas, polyurethanes or other polymers having ureide or urethane links; Precondensation products forming them
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- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M2101/00—Chemical constitution of the fibres, threads, yarns, fabrics or fibrous goods made from such materials, to be treated
- D06M2101/02—Natural fibres, other than mineral fibres
- D06M2101/04—Vegetal fibres
- D06M2101/06—Vegetal fibres cellulosic
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- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
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- D06M2200/00—Functionality of the treatment composition and/or properties imparted to the textile material
- D06M2200/10—Repellency against liquids
- D06M2200/12—Hydrophobic properties
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- D—TEXTILES; PAPER
- D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
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- D10B2401/13—Physical properties anti-allergenic or anti-bacterial
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- Chemical Or Physical Treatment Of Fibers (AREA)
Abstract
The invention discloses an antibacterial nano-silver melt-blown fabric for a mask and a preparation process thereof, wherein in the preparation process, modified mixed fibers are fluidized by pressurized hot air to form a fluidized gas-solid mixture, the gas-solid mixture is taken as a traction air flow and sprayed out from two sides of a spinneret plate to spray and stretch molten polypropylene, a melt is cooled on a receiving device to obtain a basic melt-blown fabric, a layer of nano-inorganic antibacterial particles is fixedly laid on the surface of the modified bamboo charcoal fiber, and the nano-bamboo charcoal microporous structure cannot be blocked while the good antibacterial and bacteriostatic effects are achieved, so that the performances of the nano-bamboo charcoal such as air permeability and adsorption cannot be influenced; the reduced graphene oxide with small diameter and long surface of the breathable fiber can not block the surface of the raw material fiber, so that the hydrophobic capacity of the raw material fiber is improved while the breathable performance of the raw material fiber is ensured; the antibacterial coating makes up the influence of the addition of the modified mixed fiber on the aperture of the melt-blown fabric on one hand, and improves the antibacterial performance of the melt-blown fabric on the other hand.
Description
Technical Field
The invention belongs to the technical field of mask production, and particularly relates to antibacterial nano-silver melt-blown cloth for a mask and a preparation process thereof.
Background
The melt-blown fabric is the most core material of the mask, the melt-blown fabric mainly takes polypropylene as a main raw material, and the fiber diameter can reach 1-5 microns. The superfine fiber with the unique capillary structure increases the number and the surface area of the fiber per unit area, so that the melt-blown fabric has good filtering property, shielding property, heat insulation property and oil absorption property. Can be used in the fields of air, liquid filtering materials, isolating materials, absorbing materials, mask materials, warm-keeping materials, oil absorbing materials, wiping cloth and the like;
the melt-blown cloth is used as a core material of the mask, the quality of the melt-blown cloth has the most direct influence on the quality of the mask, the service life of a common disposable mask is about 4 hours, the mask needs to be replaced for a longer time, the rapid propagation of bacteria on the mask is avoided, and the influence on the health of a user is caused, meanwhile, the filtering performance of the melt-blown cloth is limited, the filtering performance can be improved but the air permeability of the melt-blown cloth can be reduced by improving the thickness of the melt-blown cloth and reducing the pore diameter of the melt-blown cloth, so that the melt-blown cloth with good and lasting filtering performance is needed, the antibacterial capability and the air permeability of the melt-blown cloth are improved under the condition of not increasing the thickness, antibacterial particles are sprayed on the surface of melt-blown cloth fibers in a viscous state in the prior art, the fixing effect of the melt-blown cloth fibers is poor, the melt-blown cloth fibers are easy to be inhaled into nasal cavities and, the invention has obvious influence on the antibacterial effect of the melt-blown fabric, and provides the following technical scheme in order to solve the problems.
Disclosure of Invention
The invention aims to provide antibacterial nano-silver melt-blown cloth for a mask and a preparation process thereof.
The technical problems to be solved by the invention are as follows:
in order to promote the antibiotic bacteriostatic property of melt-blown cloth among the prior art, generally fix antibacterial material through the nature of adhesive or melt-blown cloth material itself on fashioned melt-blown cloth surface, thereby form the material layer that the one deck has antibacterial effect, but fix the fixed effect that antibacterial material can't be guaranteed on the one hand on the material layer on the melt-blown cloth on the one hand, lead to antibiotic by user's suction nasal cavity and oral cavity, the gas permeability that the antibiotic layer on the melt-blown cloth can be influenced to on the other hand, thereby influence the quality of the gauze mask that becomes.
The purpose of the invention can be realized by the following technical scheme:
a preparation process of antibacterial nano-silver melt-blown cloth for a mask comprises the following steps:
firstly, adding polypropylene into hot melting equipment for heating and melting, and adding the molten polypropylene into melt-blowing equipment for melt-blowing;
secondly, fluidizing the modified mixed fibers by pressurized hot air to form a fluidized gas-solid mixture, spraying the gas-solid mixture serving as traction air flow from two sides of a spinneret plate to spray and stretch the molten polypropylene in the first step, and cooling the melt on a receiving device to obtain a basic melt-blown fabric;
the weight ratio of the polypropylene to the modified mixed fiber in the basic melt-blown fabric is 1: 0.04-0.17;
the modified mixed fiber is prepared from modified bamboo charcoal fiber and breathable fiber according to the weight ratio of 1: 0.6-1.7, and mixing uniformly;
and thirdly, uniformly spraying bacteriostatic coating on one surface of the basic melt-blown fabric, and drying to form a bacteriostatic coating to obtain the antibacterial nano-silver melt-blown fabric for the mask.
The preparation method of the modified bamboo charcoal fiber comprises the following steps:
s21, adding the nano bamboo charcoal into a mixed solution of deionized water and ethanol, cleaning, removing a floating layer and impurities on the surface of the nano bamboo charcoal, heating and drying at 65-90 ℃ for later use, wherein the volume ratio of ethanol to deionized water in the mixed solution is 1: 1-5;
s22, drying the nano inorganic antibacterial particles after the nano inorganic antibacterial particles are treated by a silane coupling agent for later use, preparing a carboxymethyl cellulose aqueous solution with the mass concentration of 1.2-2.3%, adding the nano inorganic antibacterial particles into the aqueous solution, ultrasonically dispersing the nano inorganic antibacterial particles uniformly, heating the mixture to 60-75 ℃, reducing the viscosity of the system, adding an aqueous polyurethane emulsion into the aqueous polyurethane emulsion, stirring the mixture for 10-13min at the rotation speed of 1200-2000r/min, ultrasonically treating the mixture for 8-20min at the rotation speed of 60-120KHz, and then stirring the mixture for 7-15min at the rotation speed of 1600-2200r/min to obtain a dispersion system, namely a surface treatment solution, of the nano inorganic antibacterial particles, wherein the surface of the dispersion system is wrapped by the polyurethane emulsion;
the silane coupling agent is one or a mixture of at least two of KH550, KH560, KH570, KH792, DL602 and DL171 in any ratio;
the nano inorganic antibacterial particles are nano silver or a mixture of nano silver and nano zinc oxide in any ratio;
the volume ratio of the carboxymethyl cellulose aqueous solution to the aqueous polyurethane emulsion in the step S22 is 1: 0.7-1.3;
the adding amount of the nano inorganic antibacterial particles in the step S22 is 7-11% of the weight of the polyurethane emulsion;
s23, adding the nano bamboo charcoal obtained in the step S21 into the surface treatment liquid, stirring for 1-1.5h under the condition that the rotating speed is 60-180r/min, standing for 4-5h, separating the surface treatment liquid from the nano bamboo charcoal, and drying the nano bamboo charcoal at the temperature of 120-125 ℃ to obtain the antibacterial bamboo charcoal;
in steps S22 and S23, carboxymethyl cellulose water solution with certain viscosity is used as a dispersion medium to fully disperse the nano inorganic antibacterial particles after surface treatment, then polyurethane emulsion is added into the dispersion system, the emulsion particles in the emulsion are wrapped on the surface of the nano inorganic antibacterial particles in a stirring and ultrasonic re-stirring mode, finally the nano bamboo charcoal is added into the dispersion system for impregnation treatment, so that the polyurethane emulsion wrapped with the nano inorganic antibacterial particles is wrapped on the surface of the nano bamboo charcoal, because the diameter of the polyurethane emulsion particles is larger than the diameter of micropores of the nano bamboo charcoal, the polyurethane emulsion particles wrapped with the nano inorganic antibacterial particles can not be subjected to the micropore structure of the nano bamboo charcoal, but form a wrapping structure on the surface of the nano bamboo charcoal, after drying and removing water and other substances, a layer of the nano inorganic antibacterial particles is fixedly laid on the surface of the nano bamboo charcoal, the antibacterial and bacteriostatic effects are good, and simultaneously, the microporous structure of the nano bamboo charcoal cannot be blocked, so that the performances of the nano bamboo charcoal such as air permeability, adsorption and the like cannot be influenced;
s24, adding the high polymer material and the antibacterial bamboo charcoal into a mixed solution of dimethyl sulfoxide and acetone, stirring, mixing and dispersing, then adding a thickening agent and a defoaming agent, continuously mixing and stirring uniformly to obtain an extrusion raw material, spraying the extrusion raw material through a spinning nozzle to form a spinning flow, and curing the spinning flow sequentially through a first curing liquid and a second curing liquid to obtain the modified bamboo charcoal fiber;
the thickening agent is cellulose, and the defoaming agent is sodium polyacrylate;
the high polymer material comprises one of starch, starch derivatives, chitosan cellulose, carboxymethyl cellulose, methyl cellulose, ethyl cellulose and polyvinylpyrrolidone;
the weight ratio of the high polymer material, the antibacterial bamboo charcoal, the dimethyl sulfoxide and the acetone is (1-1.4): 0.1-0.7:4-6: 1-1.5;
the first curing liquid is prepared by uniformly mixing and dissolving deionized water, ethanol, potassium chloride and calcium chloride according to the weight ratio of 50:30:15: 5;
the second curing liquid is prepared by uniformly mixing deionized water, ethanol, isopropanol, sodium sulfate and hydrochloric acid according to the weight ratio of 30:20:15:5: 5.
The preparation method of the breathable fiber comprises the following steps:
s31, preparing a carboxymethyl cellulose aqueous solution with the mass concentration of 1.2% -2.3%, adding graphene oxide into the carboxymethyl cellulose aqueous solution, performing ultrasonic dispersion uniformly, heating to 60-75 ℃, then adding an aqueous polyurethane emulsion into the carboxymethyl cellulose aqueous solution, performing stirring treatment for 7-10min at the rotation speed of 1200-2000r/min, performing ultrasonic treatment for 14-20min at the condition of 100-140KHz, then keeping stirring, adding hydrazine hydrate into the carboxymethyl cellulose aqueous solution, performing heating reaction for 1-1.5h at the temperature of 90-95 ℃ to obtain reduced graphene oxide, performing ultrasonic treatment for 5-7min at the condition of 100-140KHz, and finally performing stirring treatment for 7-15min at the rotation speed of 1600-2200r/min to obtain a dispersion system, namely a spraying liquid, of the graphene oxide, the surface of which is wrapped with the polyurethane emulsion;
the silane coupling agent is one or a mixture of at least two of KH550, KH560, KH570, KH792, DL602 and DL171 in any ratio;
the volume ratio of the carboxymethyl cellulose aqueous solution to the aqueous polyurethane emulsion in the step S31 is 1: 0.7-1.3;
the addition amount of the graphene oxide in the step S31 is 3.6-5% of the weight of the polyurethane emulsion;
s32, adding the raw material fiber into a NaOH aqueous solution with the mass concentration of 1%, reacting at the temperature of 55-85 ℃ for 40-60min, adding NaOH until the mass concentration of NaOH is 4%, simultaneously adding hydrogen peroxide to enable the concentration of hydrogen peroxide in the solution to reach 8g/L, carrying out heat preservation reaction at the constant temperature of 70-90 ℃ for 120-130min, taking out, washing with clear water to be neutral, and drying to obtain the raw material fiber;
the raw material fiber comprises one or a mixture of at least two of cotton fiber, hemp fiber, wool fiber and silk in any ratio;
s33, spraying the spraying liquid on the raw material fiber treated in the step S32, wherein the using amount ratio of the spraying liquid to the raw material fiber is 1:1.8-2.6, and drying at the temperature of 100-120 ℃ to obtain the breathable fiber.
In the step, firstly, the graphene oxide is dispersed by a carboxymethyl cellulose aqueous solution with certain viscosity, then aqueous polyurethane emulsion is added into the graphene oxide, the graphene oxide is uniformly dispersed in the graphene oxide by stirring and ultrasonic re-stirring, then hydrazine hydrate is added into the graphene oxide by keeping stirring, the mixture is heated and reacted for 1 to 1.5 hours at the temperature of between 90 and 95 ℃ to obtain reduced graphene oxide, the surface of the reduced graphene oxide is wrapped by a layer of aqueous polyurethane emulsion droplet particles by ultrasonic and stirring treatment again, the spray liquid is uniformly sprayed on the surface of raw material fibers, the spray liquid is dried, the aqueous polyurethane is used as an adhesive to uniformly fix the surface of the fibers of the reduced graphene oxide to form a hydrophobic layer, and meanwhile, because the particle size of the polyurethane emulsion is larger, when the spray liquid is sprayed on the raw material fibers, the polyurethane emulsion particles with large particles can form a denser emulsion film, the low boiling point component evaporates with water after the stoving, and the long reduction oxidation graphite alkene of path can not cause the shutoff to raw materials fibre's surface, when guaranteeing raw materials fibre gas permeability, promotes its hydrophobic ability.
The preparation method of the antibacterial coating comprises the following steps:
s41, adding polyvinyl alcohol into deionized water, heating and dissolving, adding corn starch, and stirring and reacting for 1-1.5h at the temperature of 60-65 ℃, wherein the mass concentration of the polyvinyl alcohol in the deionized water is 1.2-2.3%, and the addition amount of the corn starch in the deionized water is 48-55g/100 ml;
s42, adding the clove oil, the nano calcium carbonate and the antibacterial bamboo charcoal prepared in the steps S21-S23 into the product of the step S41, uniformly mixing and dispersing, and then stirring and reacting for 1-1.5 hours at the temperature of 60-65 ℃ to obtain the antibacterial coating, wherein the weight ratio of the clove oil, the nano calcium carbonate, the antibacterial bamboo charcoal and the product of the step S41 is 0.1-0.15:1.2-1.8:1.8-2: 10-14.
In the step, gelatinized starch is used as a main adhesive component, clove oil with antibacterial property and antibacterial bamboo charcoal and nano calcium carbonate with enhanced connection effect are dispersed in the gelatinized starch, and the antibacterial coating is sprayed on one surface of the basic meltblown fabric and dried and formed to form an antibacterial coating with good permeability, so that the influence of the addition of the modified mixed fiber on the pore diameter of the meltblown fabric is compensated, and the antibacterial property of the meltblown fabric is improved.
The invention has the beneficial effects that:
the antibacterial nano silver melt-blown fabric for the mask is prepared by fluidizing modified mixed fibers by pressurized hot air to form a fluidized gas-solid mixture, spraying the gas-solid mixture from two sides of a spinneret plate as traction airflow to spray and stretch molten polypropylene, cooling a melt on a receiving device to obtain a basic melt-blown fabric, fully mixing the modified mixed fibers with the polypropylene fibers, fixing the modified mixed fibers, fully dispersing surface-treated nano inorganic antibacterial particles by using a carboxymethyl cellulose aqueous solution with certain viscosity as a dispersion medium in the preparation process of the modified bamboo charcoal fibers, adding polyurethane emulsion into a dispersion system, and wrapping emulsion particles in the emulsion on the surfaces of the nano inorganic antibacterial particles in a stirring, ultrasonic and re-stirring manner, finally, adding the nano bamboo charcoal into the dispersion system for dipping treatment, so that the polyurethane emulsion wrapped with the nano inorganic antibacterial particles is wrapped on the surface of the nano bamboo charcoal, because the diameter of the polyurethane emulsion particles is larger than the diameter of micropores of the nano bamboo charcoal, the polyurethane emulsion particles wrapped with the nano inorganic antibacterial particles cannot be in the micropore structure of the nano bamboo charcoal, but form a wrapping structure on the surface of the nano bamboo charcoal, after drying and removing water and other substances, a layer of nano inorganic antibacterial particles is fixedly laid on the surface of the nano bamboo charcoal, and when a good antibacterial and bacteriostatic effect is achieved, the micropore structure of the nano bamboo charcoal cannot be blocked, so that the performances of air permeability, adsorption and the like of the nano bamboo charcoal cannot be affected; in the preparation process of the breathable fiber, firstly, the graphene oxide is dispersed by a carboxymethyl cellulose aqueous solution with certain viscosity, then aqueous polyurethane emulsion is added into the graphene oxide, the graphene oxide is uniformly dispersed in the graphene oxide by stirring and ultrasonic re-stirring, then hydrazine hydrate is added into the graphene oxide by keeping stirring, the mixture is heated and reacted for 1 to 1.5 hours at the temperature of between 90 and 95 ℃ to obtain reduced graphene oxide, the surface of the reduced graphene oxide is coated with a layer of aqueous polyurethane emulsion droplet particles by ultrasonic and stirring treatment again, the spray liquid is uniformly sprayed on the surface of a raw material fiber, the reduced graphene oxide is uniformly fixed on the surface of the fiber by taking the aqueous polyurethane as an adhesive through drying and drying to form a hydrophobic layer, and meanwhile, as the particle size of the polyurethane emulsion is larger, the spray liquid is sprayed on the raw material fiber, the large-particle polyurethane emulsion particles can form a dense emulsion film, low-boiling-point components are evaporated with water after drying, the reduced graphene oxide with small diameter and long length cannot block the surface of the raw material fiber, and the hydrophobic capacity of the raw material fiber is improved while the air permeability of the raw material fiber is ensured; in the preparation process of the antibacterial coating, gelatinized starch is used as a main adhesive component, clove oil with antibacterial property and antibacterial bamboo charcoal and nano calcium carbonate with enhanced connection effect are dispersed in the main adhesive component, the antibacterial coating is sprayed on one surface of basic melt-blown fabric and dried and formed to form an antibacterial coating with good permeability, on one hand, the influence of the addition of modified mixed fibers on the aperture of the melt-blown fabric is compensated, and on the other hand, the antibacterial property of the melt-blown fabric is improved.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
A preparation process of antibacterial nano-silver melt-blown cloth for a mask comprises the following steps:
firstly, adding polypropylene into hot melting equipment for heating and melting, and adding the molten polypropylene into melt-blowing equipment for melt-blowing;
secondly, fluidizing the modified mixed fibers by pressurized hot air to form a fluidized gas-solid mixture, spraying the gas-solid mixture serving as traction air flow from two sides of a spinneret plate to spray and stretch the molten polypropylene in the first step, and cooling the melt on a receiving device to obtain a basic melt-blown fabric;
the weight ratio of the polypropylene to the modified mixed fiber in the basic melt-blown fabric is 1: 0.14;
the modified mixed fiber is prepared from modified bamboo charcoal fiber and breathable fiber according to the weight ratio of 1: 0.8, evenly mixing to prepare;
and thirdly, uniformly spraying bacteriostatic coating on one surface of the basic melt-blown fabric, and drying to form a bacteriostatic coating to obtain the antibacterial nano-silver melt-blown fabric for the mask.
The preparation method of the modified bamboo charcoal fiber comprises the following steps:
s21, adding the nano bamboo charcoal into a mixed solution of deionized water and ethanol, cleaning, removing a floating layer and impurities on the surface of the nano bamboo charcoal, heating and drying at 80 ℃ for later use, wherein the volume ratio of ethanol to deionized water in the mixed solution is 1: 1;
s22, drying the nano inorganic antibacterial particles after the nano inorganic antibacterial particles are treated by a silane coupling agent for standby use, preparing a carboxymethyl cellulose aqueous solution with the mass concentration of 1.2-2.3%, adding the nano inorganic antibacterial particles into the aqueous solution, ultrasonically dispersing the nano inorganic antibacterial particles uniformly, heating the mixture to 70 ℃, reducing the viscosity of the system, adding an aqueous polyurethane emulsion into the aqueous polyurethane emulsion, stirring the mixture at the rotation speed of 1800r/min for 10min, ultrasonically treating the mixture at the rotation speed of 90KHz for 12min, and stirring the mixture at the rotation speed of 2000r/min for 10min to obtain a dispersion system, namely a surface treatment solution, of the nano inorganic antibacterial particles, wherein the surface of the dispersion system is wrapped by the polyurethane emulsion;
the silane coupling agent is KH 550;
the nano inorganic antibacterial particles are nano silver;
the volume ratio of the carboxymethyl cellulose aqueous solution to the aqueous polyurethane emulsion in the step S22 is 1: 1.1;
the adding amount of the nano inorganic antibacterial particles in the step S22 is 9% of the weight of the polyurethane emulsion;
s23, adding the nano bamboo charcoal obtained through the treatment in the step S21 into the surface treatment liquid, stirring for 1.5 hours at the rotating speed of 120r/min, standing for 4 hours, separating the surface treatment liquid from the nano bamboo charcoal, and drying the nano bamboo charcoal at the temperature of 120 ℃ to obtain the antibacterial bamboo charcoal;
s24, adding the high polymer material and the antibacterial bamboo charcoal into a mixed solution of dimethyl sulfoxide and acetone, stirring, mixing and dispersing, then adding a thickening agent and a defoaming agent, continuously mixing and stirring uniformly to obtain an extrusion raw material, spraying the extrusion raw material through a spinning nozzle to form a spinning flow, and curing the spinning flow sequentially through a first curing liquid and a second curing liquid to obtain the modified bamboo charcoal fiber;
the thickening agent is cellulose, and the defoaming agent is sodium polyacrylate;
the high polymer material is carboxymethyl cellulose;
the weight ratio of the high polymer material, the antibacterial bamboo charcoal, the dimethyl sulfoxide and the acetone is 1.2: 0.3:5: 1.2;
the first curing liquid is prepared by uniformly mixing and dissolving deionized water, ethanol, potassium chloride and calcium chloride according to the weight ratio of 50:30:15: 5;
the second curing liquid is prepared by uniformly mixing deionized water, ethanol, isopropanol, sodium sulfate and hydrochloric acid according to the weight ratio of 30:20:15:5: 5.
The preparation method of the breathable fiber comprises the following steps:
s31, preparing a carboxymethyl cellulose aqueous solution with the mass concentration of 2.1%, adding graphene oxide into the aqueous solution, performing ultrasonic dispersion uniformly, heating to 70 ℃, then adding an aqueous polyurethane emulsion into the aqueous polyurethane emulsion, performing stirring treatment for 8min at the rotation speed of 1800r/min, performing ultrasonic treatment for 16min at the condition of 120KHz, then adding hydrazine hydrate into the aqueous polyurethane emulsion while maintaining stirring, performing heating reaction for 1.5h at the temperature of 90 ℃ to obtain reduced graphene oxide, performing ultrasonic treatment for 7min at the condition of 120KHz, and finally performing stirring treatment for 10min at the rotation speed of 2000r/min to obtain a dispersion system, namely a spraying liquid, of the graphene oxide, the surface of which is coated with the polyurethane emulsion;
the silane coupling agent is KH 550;
the volume ratio of the carboxymethyl cellulose aqueous solution to the aqueous polyurethane emulsion in the step S31 is 1: 1.1;
the addition amount of the graphene oxide in the step S31 is 4% of the weight of the polyurethane emulsion;
s32, adding the raw material fiber into a NaOH aqueous solution with the mass concentration of 1%, reacting for 45min at the temperature of 80 ℃, adding NaOH until the mass concentration of NaOH is 4%, simultaneously adding hydrogen peroxide to enable the concentration of hydrogen peroxide in the solution to reach 8g/L, keeping the temperature at the constant temperature of 80 ℃ for reaction for 120min, taking out, washing with clear water to be neutral, and drying to obtain the raw material fiber;
the raw material fiber is fibrilia;
s33, spraying the spraying liquid on the raw material fiber processed in the step S32, wherein the using amount ratio of the spraying liquid to the raw material fiber is 1:2.2, and drying at the temperature of 115 ℃ to obtain the breathable fiber.
The preparation method of the antibacterial coating comprises the following steps:
s41, adding polyvinyl alcohol into deionized water, heating and dissolving, adding corn starch, and stirring and reacting for 1h at 65 ℃, wherein the mass concentration of the polyvinyl alcohol in the deionized water is 2%, and the addition amount of the corn starch in the deionized water is 50g/100 ml;
s42, adding the clove oil, the nano calcium carbonate and the antibacterial bamboo charcoal prepared in the steps S21-S23 into the product obtained in the step S41, uniformly mixing and dispersing, and then stirring and reacting for 1h at 65 ℃ to obtain the antibacterial coating, wherein the weight ratio of the clove oil, the nano calcium carbonate and the antibacterial bamboo charcoal to the product obtained in the step S41 is 0.12:1.5:2: 12.
Comparative example 1
The preparation method of the modified bamboo charcoal fiber comprises the following steps:
s21, adding the nano bamboo charcoal into a mixed solution of deionized water and ethanol, cleaning, removing a floating layer and impurities on the surface of the nano bamboo charcoal, heating and drying at 80 ℃ for later use, wherein the volume ratio of ethanol to deionized water in the mixed solution is 1: 1;
s22, drying the nano inorganic antibacterial particles after the nano inorganic antibacterial particles are treated by a silane coupling agent for later use, preparing a carboxymethyl cellulose aqueous solution with the mass concentration of 1.2-2.3%, adding the nano inorganic antibacterial particles into the carboxymethyl cellulose aqueous solution, and heating the mixture to 70 ℃ after the nano inorganic antibacterial particles are uniformly dispersed by ultrasound to obtain a surface treatment solution;
the silane coupling agent is KH 550;
the nano inorganic antibacterial particles are nano silver;
the adding amount of the nano inorganic antibacterial particles in the step S22 is 4.6 percent of the weight of the carboxymethyl cellulose aqueous solution;
s23, adding the nano bamboo charcoal obtained through the treatment in the step S21 into the surface treatment liquid, stirring for 1.5 hours at the rotating speed of 120r/min, standing for 4 hours, separating the surface treatment liquid from the nano bamboo charcoal, and drying the nano bamboo charcoal at the temperature of 120 ℃ to obtain the antibacterial bamboo charcoal;
s24, adding the high polymer material and the antibacterial bamboo charcoal into a mixed solution of dimethyl sulfoxide and acetone, stirring, mixing and dispersing, then adding a thickening agent and a defoaming agent, continuously mixing and stirring uniformly to obtain an extrusion raw material, spraying the extrusion raw material through a spinning nozzle to form a spinning flow, and curing the spinning flow sequentially through a first curing liquid and a second curing liquid to obtain the modified bamboo charcoal fiber;
the thickening agent is cellulose, and the defoaming agent is sodium polyacrylate;
the high polymer material is carboxymethyl cellulose;
the weight ratio of the high polymer material, the antibacterial bamboo charcoal, the dimethyl sulfoxide and the acetone is 1.2: 0.3:5: 1.2;
the first curing liquid is prepared by uniformly mixing and dissolving deionized water, ethanol, potassium chloride and calcium chloride according to the weight ratio of 50:30:15: 5;
the second curing liquid is prepared by uniformly mixing deionized water, ethanol, isopropanol, sodium sulfate and hydrochloric acid according to the weight ratio of 30:20:15:5: 5.
Other conditions are the same.
Example 2
The preparation method of the breathable fiber comprises the following steps:
s31, preparing a carboxymethyl cellulose aqueous solution with the mass concentration of 2.1%, adding graphene oxide into the aqueous solution, heating the solution to 70 ℃ after uniform ultrasonic dispersion, then adding hydrazine hydrate into the solution while keeping stirring, and heating the solution at the temperature of 90 ℃ for reaction for 1.5 hours to obtain a dispersion liquid of reduced graphene oxide, namely a spray liquid;
the silane coupling agent is KH 550;
the addition amount of the graphene oxide in the step S31 is 2.1% of the weight of the carboxymethyl cellulose aqueous solution;
s32, adding the raw material fiber into a NaOH aqueous solution with the mass concentration of 1%, reacting for 45min at the temperature of 80 ℃, adding NaOH until the mass concentration of NaOH is 4%, simultaneously adding hydrogen peroxide to enable the concentration of hydrogen peroxide in the solution to reach 8g/L, keeping the temperature at the constant temperature of 80 ℃ for reaction for 120min, taking out, washing with clear water to be neutral, and drying to obtain the raw material fiber;
the raw material fiber is fibrilia;
s33, spraying the spraying liquid on the raw material fiber processed in the step S32, wherein the using amount ratio of the spraying liquid to the raw material fiber is 1:2.2, and drying at the temperature of 115 ℃ to obtain the breathable fiber.
Example 3
A preparation process of antibacterial nano-silver melt-blown cloth for a mask comprises the following steps:
firstly, adding polypropylene into hot melting equipment for heating and melting, and adding the molten polypropylene into melt-blowing equipment for melt-blowing;
and secondly, spraying and stretching the molten polypropylene in the first step from two sides of a spinneret plate by taking pressurized hot air as a traction air flow, and cooling the melt on a receiving device to obtain the melt-blown fabric.
Experimental results and data analysis
Reference is made to GB/T20944.3-2008 section 3 for evaluation of antibacterial properties of textiles: oscillation method, testing the bacteriostasis rate of the meltblown fabric to escherichia coli and staphylococcus aureus; the air permeability was tested according to GB/T5453-1997 determination of air permeability of textile fabrics, with the following specific results:
| example 1 | Comparative example 1 | Comparative example 2 | Comparative example 3 | |
| Inhibition of E.coli/%) | >99.9 | >99.9 | >99.9 | No antibacterial property |
| Inhibition of Staphylococcus aureus/%) | >99.9 | >99.9 | >99.9 | No antibacterial property |
| Air permeability/mm.s-1 | 3215.7 | 2896.6 | 2914.3 | 3421.7 |
| Filtration efficiency/%) | 93.2 | 92.7 | 94.1 | 90.6 |
As can be seen from the above table, the antibacterial nano silver meltblown for masks of the present invention has good antibacterial performance and filtration efficiency, and does not significantly reduce the air permeability of the meltblown.
The foregoing is merely exemplary and illustrative of the present invention and various modifications, additions and substitutions may be made by those skilled in the art to the specific embodiments described without departing from the scope of the invention as defined in the following claims.
Claims (10)
1. A preparation process of antibacterial nano-silver melt-blown cloth for a mask is characterized by comprising the following steps:
firstly, adding polypropylene into hot melting equipment for heating and melting, and adding the molten polypropylene into melt-blowing equipment for melt-blowing;
secondly, fluidizing the modified mixed fibers by pressurized hot air to form a fluidized gas-solid mixture, spraying the gas-solid mixture serving as traction air flow from two sides of a spinneret plate to spray and stretch the molten polypropylene in the first step, and cooling the melt on a receiving device to obtain a basic melt-blown fabric;
and thirdly, uniformly spraying bacteriostatic coating on one surface of the basic melt-blown fabric, and drying to form a bacteriostatic coating to obtain the antibacterial nano-silver melt-blown fabric for the mask.
2. The preparation process of the antibacterial nano-silver meltblown for masks according to claim 1, wherein the weight ratio of polypropylene to modified mixed fiber in the basic meltblown is 1: 0.04-0.17; the modified mixed fiber is prepared from modified bamboo charcoal fiber and breathable fiber according to the weight ratio of 1: 0.6-1.7, and mixing uniformly.
3. The preparation process of the antibacterial nano silver meltblown for masks according to claim 2, wherein the preparation method of the modified bamboo charcoal fiber comprises the following steps:
s21, adding the nano bamboo charcoal into a mixed solution of deionized water and ethanol, cleaning, removing a floating layer and impurities on the surface of the nano bamboo charcoal, heating and drying at 65-90 ℃ for later use, wherein the volume ratio of ethanol to deionized water in the mixed solution is 1: 1-5;
s22, drying the nano inorganic antibacterial particles after the nano inorganic antibacterial particles are treated by a silane coupling agent for standby use, preparing a carboxymethyl cellulose aqueous solution with the mass concentration of 1.2-2.3%, adding the nano inorganic antibacterial particles into the aqueous solution, uniformly dispersing the nano inorganic antibacterial particles by ultrasonic, heating the mixture to 60-75 ℃, then adding an aqueous polyurethane emulsion into the aqueous polyurethane emulsion, stirring the mixture for 10-13min at the rotation speed of 1200-2000r/min, then performing ultrasonic treatment for 8-20min at the rotation speed of 60-120KHz, and then stirring the mixture for 7-15min at the rotation speed of 1600-2200r/min to obtain a dispersion system, namely a surface treatment solution, wherein the polyurethane emulsion is wrapped on the surfaces of the nano inorganic antibacterial particles;
s23, adding the nano bamboo charcoal obtained in the step S21 into the surface treatment liquid, stirring for 1-1.5h under the condition that the rotating speed is 60-180r/min, standing for 4-5h, separating the surface treatment liquid from the nano bamboo charcoal, and drying the nano bamboo charcoal at the temperature of 120-125 ℃ to obtain the antibacterial bamboo charcoal;
s24, adding the high polymer material and the antibacterial bamboo charcoal into a mixed solution of dimethyl sulfoxide and acetone, stirring, mixing and dispersing, then adding a thickening agent and a defoaming agent, continuously mixing and stirring uniformly to obtain an extrusion raw material, spraying the extrusion raw material through a spinning nozzle to form a spinning flow, and curing the spinning flow sequentially through a first curing liquid and a second curing liquid to obtain the modified bamboo charcoal fiber;
the weight ratio of the high polymer material, the antibacterial bamboo charcoal, the dimethyl sulfoxide and the acetone is 1-1.4: 0.1-0.7:4-6: 1-1.5;
the first curing liquid is prepared by uniformly mixing and dissolving deionized water, ethanol, potassium chloride and calcium chloride according to the weight ratio of 50:30:15: 5;
the second curing liquid is prepared by uniformly mixing deionized water, ethanol, isopropanol, sodium sulfate and hydrochloric acid according to the weight ratio of 30:20:15:5: 5.
4. The process for preparing the antibacterial nanosilver meltblown for masks according to claim 3, wherein the thickener is cellulose and the defoamer is sodium polyacrylate;
the high polymer material comprises one of starch, starch derivatives, chitosan cellulose, carboxymethyl cellulose, methyl cellulose, ethyl cellulose and polyvinylpyrrolidone; the nano inorganic antibacterial particles are nano silver or a mixture of nano silver and nano zinc oxide in any ratio.
5. The process for preparing antibacterial nanosilver meltblown for masks according to claim 3, wherein the volume ratio of the carboxymethyl cellulose aqueous solution to the aqueous polyurethane emulsion in step S22 is 1: 0.7-1.3; the addition amount of the nano inorganic antibacterial particles in the step S22 is 7-11% of the weight of the polyurethane emulsion.
6. The preparation process of the antibacterial nanosilver meltblown for masks according to claim 2, wherein the preparation method of the breathable fiber comprises the following steps:
s31, preparing a carboxymethyl cellulose aqueous solution with the mass concentration of 1.2% -2.3%, adding graphene oxide into the carboxymethyl cellulose aqueous solution, performing ultrasonic dispersion uniformly, heating to 60-75 ℃, then adding an aqueous polyurethane emulsion into the carboxymethyl cellulose aqueous solution, performing stirring treatment for 7-10min at the rotation speed of 1200-2000r/min, performing ultrasonic treatment for 14-20min at the condition of 100-140KHz, then keeping stirring, adding hydrazine hydrate into the carboxymethyl cellulose aqueous solution, performing heating reaction for 1-1.5h at the temperature of 90-95 ℃ to obtain reduced graphene oxide, performing ultrasonic treatment for 5-7min at the condition of 100-140KHz, and finally performing stirring treatment for 7-15min at the rotation speed of 1600-2200r/min to obtain a dispersion system, namely a spraying liquid, of the graphene oxide, the surface of which is wrapped with the polyurethane emulsion;
s32, adding the raw material fiber into a NaOH aqueous solution with the mass concentration of 1%, reacting at the temperature of 55-85 ℃ for 40-60min, adding NaOH until the mass concentration of NaOH is 4%, simultaneously adding hydrogen peroxide to enable the concentration of hydrogen peroxide in the solution to reach 8g/L, carrying out heat preservation reaction at the constant temperature of 70-90 ℃ for 120-130min, taking out, washing with clear water to be neutral, and drying to obtain the raw material fiber;
s33, spraying the spraying liquid on the raw material fiber treated in the step S32, wherein the using amount ratio of the spraying liquid to the raw material fiber is 1:1.8-2.6, and drying at the temperature of 100-120 ℃ to obtain the breathable fiber.
7. The preparation process of the antibacterial nanosilver meltblown for masks according to claim 6, wherein the raw material fiber comprises one or a mixture of at least two of cotton fiber, hemp fiber, wool fiber and silk in any ratio.
8. The process for preparing the antibacterial nanosilver meltblown for masks according to claim 6, wherein the volume ratio of the carboxymethyl cellulose aqueous solution to the aqueous polyurethane emulsion in step S31 is 1: 0.7-1.3; the addition amount of the graphene oxide in the step S31 is 3.6-5% of the weight of the polyurethane emulsion.
9. The preparation process of the antibacterial nano silver meltblown for the mask according to claim 1, wherein the preparation method of the antibacterial coating comprises the following steps:
s41, adding polyvinyl alcohol into deionized water, heating and dissolving, adding corn starch, and stirring and reacting for 1-1.5h at the temperature of 60-65 ℃, wherein the mass concentration of the polyvinyl alcohol in the deionized water is 1.2-2.3%, and the addition amount of the corn starch in the deionized water is 48-55g/100 ml;
s42, adding the clove oil, the nano calcium carbonate and the antibacterial bamboo charcoal prepared in the steps S21-S23 into the product of the step S41, uniformly mixing and dispersing, and then stirring and reacting for 1-1.5 hours at the temperature of 60-65 ℃ to obtain the antibacterial coating, wherein the weight ratio of the clove oil, the nano calcium carbonate, the antibacterial bamboo charcoal and the product of the step S41 is 0.1-0.15:1.2-1.8:1.8-2: 10-14.
10. An antibacterial nano silver meltblown for a mask, which is prepared by the preparation process of the antibacterial nano silver meltblown for a mask according to any one of claims 1 to 9.
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