Breathable antibacterial alcohol-proof medical non-woven fabric and preparation method thereof

Abstract

The invention discloses a breathable, bacteriostatic and alcohol-proof medical non-woven fabric and a preparation method thereof, and relates to the technical field of non-woven fabrics, the breathable, bacteriostatic and alcohol-proof medical non-woven fabric comprises a skin-friendly layer, a breathable layer and a functional layer, the breathable layer is arranged between the skin-friendly layer and the functional layer, and the skin-friendly layer, the breathable layer and the functional layer are compounded into a whole through hot melting; the functional layer is obtained by spraying antibacterial liquid on the surface of the base cloth and carrying out immersion treatment by using fluorine-containing finishing liquid; by arranging a three-layer structure of the skin-friendly layer, the breathable layer and the functional layer, the functional layer is subjected to antibacterial and alcohol-proof treatment, the functional layer is endowed with excellent antibacterial and alcohol-proof performance, the breathable layer is subjected to mechanical punching treatment to achieve a breathable effect, finally, the composite non-woven fabric is obtained through hot melting, and the prepared composite non-woven fabric is good in hand feeling, skin-friendly, dry and comfortable, and has a good antibacterial and alcohol-proof effect. Meanwhile, the fabric also has excellent breathable, bacteriostatic and alcohol-proof effects.

Description

Technical Field

[0001] The invention relates to the technical field of nonwoven fabrics, and in particular to a breathable, antibacterial and alcohol-proof medical nonwoven fabric and a preparation method thereof. Background Art

[0002] Nonwoven fabrics are also called nonwoven fabrics, nonwoven fabrics, nonwoven fabrics, and nonwoven fabrics. They are cloth-like materials made of messy or directional fibers without using traditional weaving methods. Nonwoven fabrics use the basic knowledge and relevant theories of modern mechanics, chemistry, physics and other disciplines, and use a variety of technologies such as chemical fiber, textile, plastic, chemical industry, dyeing and finishing, and papermaking, becoming a sunrise discipline in the textile industry. According to the needs of different customers, through process design and reasonable and scientific structural design, various nonwoven products for clothing and industry can be produced. Nonwoven products have unique functions and can replace some traditional textiles. Its development speed is much higher than the average development speed of the textile industry, and there is a rising star competing for beauty, and it is in the ascendant.

[0003] Nonwoven fabrics are a new generation of environmentally friendly materials, which are recyclable, colorful, inexpensive, non-toxic, non-irritating, easy to decompose, soft, non-combustible, lightweight, breathable, and moisture-proof. The material decomposes within eight years in indoor environments and 90 days in outdoor environments. It does not pollute the environment during the combustion process, leaves no residue, is odorless, and non-toxic. Medical nonwoven fabrics are superior to traditional pure cotton woven fabrics in terms of compositeness with other materials, hygiene, surgical infection rate, and barrier properties. In recent years, about 100 million yuan of investment in my country's medical and health industry has been used for sanitary products and materials, and the variety is diverse and developing rapidly.

[0004] Polypropylene (PP) non-woven fabrics have the advantages of high strength, excellent protective performance, breathable and comfortable, environmentally friendly, non-toxic and odorless. They are currently widely used in the medical and health fields, such as surgical gowns, surgical caps, surgical wraps, surgical covers, sterilizing bandages, protective clothing, etc. Therefore, the market has put forward higher requirements for the antibacterial properties of PP-based non-woven fabrics. At present, there are two main processing methods for PP-based non-woven fabrics with antibacterial functions: the addition method and the finishing method. Among them, the antibacterial fabrics made by the addition method have the characteristics of washing resistance and lasting antibacterial effect, which are more suitable for non-disposable antibacterial fiber products; the antibacterial fabrics made by the finishing method are not washing-resistant, and their antibacterial effect usually weakens with the increase of the number of washings. However, as far as non-woven fabrics are generally used as disposable textiles, the finishing method has the process advantages of good effect and low cost. For this reason, giving non-woven fabrics antibacterial properties through finishing technology has a high market value.

[0005] Chinese patent document CN112192915A discloses a method for preparing a medical antibacterial composite non-woven fabric, wherein the composite non-woven fabric comprises a waterproof layer, a water-absorbing layer and a contact layer; the waterproof layer is a non-woven fabric that has been antibacterial and hydrophobic finished, the water-absorbing layer is a non-woven fabric made of polypropylene fiber and a highly absorbent resin by a spunlace process, and the contact layer is an antibacterial and soft non-woven fabric; the waterproof layer, the water-absorbing layer and the contact layer are bonded by hot pressing; the antibacterial, oil-proof and alcohol-proof properties of the medical composite non-woven fabric in the prior art still need to be improved. Summary of the invention

[0006] In order to solve the shortcomings of the prior art, the purpose of the present invention is to provide a breathable, antibacterial and alcohol-proof medical non-woven fabric and a preparation method thereof. A three-layer structure of a skin-friendly layer, a breathable layer and a functional layer is set, the functional layer is treated with antibacterial and alcohol-proof treatment to give it excellent antibacterial and alcohol-proof properties, the breathable layer is mechanically punched to make it breathable, and finally a composite non-woven fabric is obtained by hot melting. The prepared composite non-woven fabric has good hand feel, is skin-friendly and dry, and also has excellent breathability, antibacterial and alcohol-proof effects.

[0007] In order to achieve the above object, the present invention adopts the following technical solution:

[0008] A breathable, antibacterial and alcohol-proof medical nonwoven fabric, comprising a skin-friendly layer, a breathable layer and a functional layer, wherein the breathable layer is arranged between the skin-friendly layer and the functional layer, and the skin-friendly layer, the breathable layer and the functional layer are composited into a whole by hot-melt bonding;

[0009] The preparation method of the functional layer comprises the following steps: taking functional fibers, opening, mixing and combing, stacking into a fiber web, stretching, leveling, and spunlacing to obtain a base fabric, spraying an antibacterial liquid on the surface of the base fabric, drying it once, and then immersing the base fabric in a fluorine-containing finishing liquid, dipping, squeezing, and drying it twice to obtain the functional layer; the functional fibers are one or more of polypropylene fibers, polyester fibers, and polyamide fibers.

[0010] Preferably, the fluorine-containing finishing liquid is an emulsion prepared by using a fluorine-containing monomer reagent, the fluorine-containing monomer reagent is a perfluoroalkyl acrylate monomer and / or a perfluoroalkyl acrylate monomer derivative, and the concentration of the fluorine-containing monomer reagent is 5 to 20 wt %; the fluorine-containing monomer is a perfluoroalkyl acrylate monomer and / or a perfluoroalkyl acrylate monomer derivative, and its general chemical formula is CH2=CROCO(CH2) x (C n F 2n+1 ), wherein R is H or an alkyl group with a chain length of 1 to 8, and the range of x and n is 1 to 8.

[0011] Preferably, the emulsion prepared using the fluorine-containing monomer reagent also includes an inhibitor and an emulsifier; the inhibitor is a divalent iron salt and / or a divalent copper salt; the molar ratio of the inhibitor to the fluorine-containing monomer reagent is 0 to 1000:1; the emulsifier is a cationic surfactant and / or a non-ionic surfactant, and the amount of the emulsifier is 0.2 to 2 wt%.

[0012] Preferably, the skin-friendly layer is made of one or more of cotton fiber, linen fiber, wool fiber, and silk; the breathable layer is made of polylactic acid fiber, and the breathable layer is provided with breathable holes through mechanical punching.

[0013] Preferably, the linear density of the polylactic acid fiber is 2.2 to 4.4 dtex, and the length is 38 to 65 mm.

[0014] Preferably, in the preparation method of the functional layer, the spraying pressure is 0.5-0.8 MPa, the spraying distance is 10-20 cm, the primary drying condition is drying at 60-80°C for 3-8 min; immersion for 5-15 min according to a bath ratio of 1:10-1:20, and then squeezing the liquid at a pressure of 0.15-0.3 MPa, and the secondary drying condition is drying at 60-100°C for 5-15 min.

[0015] Preferably, the method for preparing the antibacterial liquid comprises the following steps:

[0016] (1) adding bentonite to a hydrochloric acid solution, stirring, ultrasonically treating, standing, filtering, washing, drying, and grinding to obtain pretreated bentonite;

[0017] (2) dispersing the pretreated bentonite into a polyallylamine ethanol solution, then adding triethylamine, stirring and dispersing the mixture evenly, slowly adding a dialdehyde chitosan solution dropwise, continuously introducing nitrogen, heating the mixture for reaction, filtering, washing, and drying the product to obtain a functionalized bentonite;

[0018] (3) dispersing the functionalized bentonite in deionized water, then adding copper chloride and sodium borohydride, stirring and reacting under a nitrogen atmosphere, centrifuging, washing, and drying the product to obtain modified bentonite;

[0019] (4) Dispersing the modified bentonite in deionized water, adjusting the pH, and ultrasonically oscillating to obtain the antibacterial liquid.

[0020] Preferably, in step (1), the concentration of the hydrochloric acid solution is 1 to 3 mol / L; and the ultrasonic treatment is performed for 10 to 30 min.

[0021] Preferably, in step (2), the concentration of the polyallylamine ethanol solution is 8-15wt%; the dialdehyde chitosan is dissolved in an acetic acid-sodium acetate buffer solution with a pH of 4-6 and a concentration of 0.01-1 mol / L to obtain a dialdehyde chitosan solution, wherein the concentration of the dialdehyde chitosan solution is 2-8wt%.

[0022] Preferably, in step (2), the mass ratio of pretreated bentonite, polyallylamine ethanol solution, triethylamine, and dialdehyde chitosan solution is 10:80-200:4-15:46-127; the temperature reaction condition is that after the dialdehyde chitosan solution is added dropwise, the reaction is carried out at 70-85°C for 3-6 hours.

[0023] Preferably, in step (3), the dosage ratio of the functionalized bentonite, deionized water, copper chloride and sodium borohydride is 10:50-100:2-6:15-30, and the stirring reaction condition is stirring the reaction at room temperature for 2-5 hours.

[0024] Preferably, in step (4), the pH is adjusted to 3-6, and ultrasonic oscillation is performed for 10-30 minutes; and the mass ratio of modified bentonite to deionized water is 1:10-20.

[0025] The present invention also claims protection for a method for preparing the breathable, antibacterial and alcohol-proof medical non-woven fabric, comprising the following steps: an active unwinding device rotates and unwinds, sandwiching the breathable layer between the skin-friendly layer and the functional layer, and sending the three layers together into a hot air penetration dryer for hot melt compounding into a whole, thereby obtaining the breathable, antibacterial and alcohol-proof medical non-woven fabric; the drying temperature during hot melt compounding is 100-140°C, the production line speed is 50-60m / min, the drying time is 2-6min, and the product thickness is 1.5-7mm.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] 1) The present invention provides a breathable, antibacterial, and alcohol-proof medical non-woven fabric. The three-layer structure of a skin-friendly layer, a breathable layer, and a functional layer is provided. The functional layer is subjected to antibacterial and organic fluorine finishing to give it excellent antibacterial and alcohol-proof properties. The breathable layer is subjected to mechanical perforation treatment to make it breathable. Finally, a composite non-woven fabric is obtained by hot melting. The composite non-woven fabric has good hand feel, is skin-friendly, and is dry and cool, and also has excellent breathability, antibacterial, and alcohol-proof effects.

[0028] 2) The present invention provides a modified bentonite, which is first pretreated with hydrochloric acid, and then the H +Replace the cations in the bentonite, remove the blocked impurities, dredge the internal pores of the bentonite, effectively increase the pore size and porosity of the bentonite, increase the surface area of ​​the bentonite, and provide a large number of active sites for subsequent reactions; then fix the polyallylamine with strong adsorption on the surface of the bentonite, and then use the aldehyde group of the dialdehyde chitosan to react with the Schiff base of the amino group in the polyallylamine under the catalysis of triethylamine to fix the dialdehyde chitosan on the surface of the bentonite in the form of an imine complex, using natural polysaccharides carrying positive charges to effectively The antibacterial and antimicrobial properties and biocompatibility of bentonite are improved, and the long-term stability of the antibacterial and antimicrobial effects is ensured; finally, copper chloride is added, and the copper ions are reduced to nano-copper particles under the action of the reducing agent sodium borohydride. The copper ions can complex with the amino and aldehyde groups on the surface of the functionalized bentonite, thereby effectively preventing the aggregation of copper particles. Nano-copper particles are an inorganic antibacterial material with the advantages of broad antibacterial spectrum, good stability, low toxicity, and no drug resistance to bacteria. They can synergize with dialdehyde chitosan to exert excellent antibacterial properties. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with embodiments. Of course, the specific embodiments described here are only used to explain the present invention and are not used to limit the present invention.

[0030] Unless otherwise specified, the chemical reagents and materials in the present invention are purchased from commercial sources or synthesized from raw materials purchased from commercial sources.

[0031] The preparation method of the dialdehyde chitosan refers to Section 1.2.1 of "Preparation and Adsorption Properties of Polydopamine-Modified Dialdehyde Chitosan" published by Jin Haijun et al. (2023) in "Fine Chemicals".

[0032] A method for preparing a breathable, antibacterial and alcohol-proof medical non-woven fabric comprises the following steps:

[0033] (1) adding bentonite to a 1-3 mol / L hydrochloric acid solution, stirring and then ultrasonically treating for 10-30 min, standing, filtering, washing, drying, and grinding to obtain pretreated bentonite;

[0034] (2) Dispersing 10 g of pretreated bentonite into 80-200 g of 8-15 wt% polyallylamine ethanol solution, then adding 4-15 g of triethylamine, stirring and dispersing evenly, slowly adding dropwise 46-127 g of 2-8 wt% dialdehyde chitosan solution (obtained by dissolving dialdehyde chitosan in acetic acid-sodium acetate buffer with a pH of 4-6 and a concentration of 0.01-1 mol / L), continuously introducing nitrogen, and reacting at 70-85° C. for 3-6 h after the dialdehyde chitosan solution is added dropwise, filtering, washing, and drying the product to obtain functionalized bentonite;

[0035] (3) Dispersing 10 g of functionalized bentonite into 50-100 g of deionized water, then adding 2-6 g of copper chloride and 15-30 g of sodium borohydride, stirring and reacting at room temperature for 2-5 h, centrifuging, washing, and drying the product to obtain modified bentonite;

[0036] (4) dispersing 10 g of modified bentonite into 100-200 g of deionized water, adjusting the pH to 3-6, and ultrasonically oscillating for 10-30 min to obtain the antibacterial solution;

[0037] (5) taking one or more of polypropylene fiber, polyester fiber, and polyamide fiber, opening, mixing and combing, stacking into a fiber web, drawing, leveling, and spunlacing to obtain a base fabric, spraying an antibacterial liquid on the surface of the base fabric, the spraying pressure is 0.5-0.8 MPa, the spraying distance is 10-20 cm, and drying at 60-80° C. for 3-8 min, then immersing the base fabric in a fluorine-containing finishing liquid, immersing for 5-15 min according to a bath ratio of 1:10-1:20, and then squeezing the liquid at a pressure of 0.15-0.3 MPa, and drying at 60-100° C. for 5-15 min to obtain the functional layer; processing one or more of cotton fiber, hemp fiber, wool fiber, and silk into a skin-friendly layer; taking polylactic acid fiber with a linear density of 2.2-4.4 dtex and a length of 38-65 mm to process it into a breathable layer, and the breathable layer is provided with breathable holes distributed by mechanical punching;

[0038] (6) The active unwinding device rotates and unwinds, sandwiching the breathable layer between the skin-friendly layer and the functional layer, and sending the three layers together into a hot air penetration dryer for hot melt compounding to form a whole, thereby obtaining the breathable, antibacterial and alcohol-proof medical non-woven fabric; the drying temperature during hot melt compounding is 100-140° C., the production line speed is 50-60 m / min, the drying time is 2-6 min, and the product thickness is 1.5-7 mm.

[0039] The present invention will be further described below through specific embodiments.

[0040] Example 1

[0041] A method for preparing a breathable, antibacterial and alcohol-proof medical non-woven fabric comprises the following steps:

[0042] (1) adding bentonite to a 3 mol / L hydrochloric acid solution, stirring and then ultrasonically treating for 30 min, standing, filtering, washing, drying, and grinding to obtain pretreated bentonite;

[0043] (2) Disperse 10 g of pretreated bentonite into 200 g of 15 wt% polyallylamine ethanol solution, then add 15 g of triethylamine, stir and disperse evenly, slowly dropwise add 127 g of 8 wt% dialdehyde chitosan solution (dialdehyde chitosan is dissolved in acetic acid-sodium acetate buffer with a pH of 5 and a concentration of 0.5 mol / L), continuously introduce nitrogen, and after the dialdehyde chitosan solution is added dropwise, react at 85° C. for 3 h, filter, wash, and dry the product to obtain functionalized bentonite;

[0044] (3) Dispersing 10 g of functionalized bentonite into 100 g of deionized water, then adding 6 g of copper chloride and 30 g of sodium borohydride, stirring and reacting at room temperature for 5 h, centrifuging, washing, and drying the product to obtain modified bentonite;

[0045] (4) dispersing 10 g of modified bentonite into 100 g of deionized water, adjusting the pH to 4.5, and ultrasonically oscillating for 30 min to obtain an antibacterial solution;

[0046] (5) taking polypropylene fibers, opening, mixing and combing, stacking into a fiber web, drawing, leveling, and spunlacing to obtain a base fabric, spraying an antibacterial liquid on the surface of the base fabric, the spraying pressure is 0.65 MPa, the spraying distance is 15 cm, and the base fabric is dried at 70°C for 5.5 min, and then the base fabric is immersed in a fluorine-containing finishing liquid (2-(perfluorohexyl) ethyl methacrylate monomer, the concentration is 10wt%; the polymerization inhibitor is ferrous sulfate, the molar ratio of the monomer is 300:1; the emulsifier is lauryl alcohol polyoxyethylene ether, the amount is 0.8wt%), and the base fabric is immersed for 10 min according to a bath ratio of 1:15, and then the liquid is squeezed at a pressure of 0.25 MPa, and dried at 80°C for 10 min to obtain the functional layer; processing the hemp fiber into a skin-friendly layer; taking polylactic acid fibers with a linear density of 3.6 dtex and a length of 40 to 52 mm to be processed into a breathable layer, and the breathable layer is provided with breathable holes distributed by mechanical punching;

[0047] (6) The active unwinding device rotates and unwinds, sandwiching the breathable layer between the skin-friendly layer and the functional layer, and sending the three layers together into a hot air penetration dryer for hot melt compounding to form a whole, thereby obtaining the breathable, antibacterial and alcohol-proof medical non-woven fabric; the drying temperature during hot melt compounding is 120° C., the production line speed is 55 m / min, the drying time is 4 min, and the product thickness is 4 mm.

[0048] Example 2

[0049] A method for preparing a breathable, antibacterial and alcohol-proof medical non-woven fabric comprises the following steps:

[0050] (1) adding bentonite to a 2 mol / L hydrochloric acid solution, stirring and then ultrasonically treating for 20 min, standing, filtering, washing, drying, and grinding to obtain pretreated bentonite;

[0051] (2) Disperse 10 g of pretreated bentonite into 140 g of 12 wt% polyallylamine ethanol solution, then add 9 g of triethylamine, stir and disperse evenly, slowly dropwise add 86.5 g of 5 wt% dialdehyde chitosan solution (dialdehyde chitosan is dissolved in acetic acid-sodium acetate buffer with a pH of 5 and a concentration of 0.5 mol / L), continuously introduce nitrogen, and after the dialdehyde chitosan solution is added dropwise, react at 80° C. for 4.5 h, filter, wash, and dry the product to obtain functionalized bentonite;

[0052] (3) Dispersing 10 g of functionalized bentonite into 75 g of deionized water, then adding 4 g of copper chloride and 22 g of sodium borohydride, stirring and reacting at room temperature for 3.5 h, centrifuging, washing, and drying the product to obtain modified bentonite;

[0053] (4) Dispersing 10 g of modified bentonite into 150 g of deionized water, adjusting the pH to 4.5, and ultrasonically oscillating for 20 min to obtain an antibacterial solution;

[0054] (5) taking polypropylene fibers, opening, mixing and combing, stacking into a fiber web, drawing, leveling, and spunlacing to obtain a base fabric, spraying an antibacterial liquid on the surface of the base fabric, the spraying pressure is 0.65 MPa, the spraying distance is 15 cm, and the base fabric is dried at 70°C for 5.5 min, and then the base fabric is immersed in a fluorine-containing finishing liquid (2-(perfluorohexyl) ethyl methacrylate monomer, the concentration is 10wt%; the polymerization inhibitor is ferrous sulfate, the molar ratio of the monomer is 300:1; the emulsifier is lauryl alcohol polyoxyethylene ether, the amount is 0.8wt%), and the base fabric is immersed for 10 min according to a bath ratio of 1:15, and then the liquid is squeezed at a pressure of 0.25 MPa, and dried at 80°C for 10 min to obtain the functional layer; processing the hemp fiber into a skin-friendly layer; taking polylactic acid fibers with a linear density of 3.6 dtex and a length of 40 to 52 mm to be processed into a breathable layer, and the breathable layer is provided with breathable holes distributed by mechanical punching;

[0055] (6) The active unwinding device rotates and unwinds, sandwiching the breathable layer between the skin-friendly layer and the functional layer, and sending the three layers together into a hot air penetration dryer for hot melt compounding to form a whole, thereby obtaining the breathable, antibacterial and alcohol-proof medical non-woven fabric; the drying temperature during hot melt compounding is 120° C., the production line speed is 55 m / min, the drying time is 4 min, and the product thickness is 4 mm.

[0056] Example 3

[0057] A method for preparing a breathable, antibacterial and alcohol-proof medical non-woven fabric comprises the following steps:

[0058] (1) adding bentonite to a 1 mol / L hydrochloric acid solution, stirring and then ultrasonically treating for 10 min, standing, filtering, washing, drying, and grinding to obtain pretreated bentonite;

[0059] (2) Dispersing 10 g of pretreated bentonite into 80 g of 8 wt% polyallylamine ethanol solution, then adding 4 g of triethylamine, stirring and dispersing evenly, slowly dropping 46 g of 2 wt% dialdehyde chitosan solution (obtained by dissolving dialdehyde chitosan in acetic acid-sodium acetate buffer with a pH of 5 and a concentration of 0.5 mol / L), continuously passing nitrogen, and reacting at 70° C. for 6 h after the dialdehyde chitosan solution is added, filtering, washing, and drying the product to obtain functionalized bentonite;

[0060] (3) Dispersing 10 g of functionalized bentonite into 50 g of deionized water, then adding 2 g of copper chloride and 15 g of sodium borohydride, stirring and reacting at room temperature for 2 h, centrifuging, washing, and drying the product to obtain modified bentonite;

[0061] (4) dispersing 10 g of modified bentonite into 200 g of deionized water, adjusting the pH to 4.5, and ultrasonically oscillating for 10 min to obtain an antibacterial solution;

[0062] (5) taking polypropylene fibers, opening, mixing and combing, stacking into a fiber web, drawing, leveling, and spunlacing to obtain a base fabric, spraying an antibacterial liquid on the surface of the base fabric, the spraying pressure is 0.65 MPa, the spraying distance is 15 cm, and the base fabric is dried at 70°C for 5.5 min, and then the base fabric is immersed in a fluorine-containing finishing liquid (2-(perfluorohexyl) ethyl methacrylate monomer, the concentration is 10wt%; the polymerization inhibitor is ferrous sulfate, the molar ratio of the monomer is 300:1; the emulsifier is lauryl alcohol polyoxyethylene ether, the amount is 0.8wt%), and the base fabric is immersed for 10 min according to a bath ratio of 1:15, and then the liquid is squeezed at a pressure of 0.25 MPa, and dried at 80°C for 10 min to obtain the functional layer; processing the hemp fiber into a skin-friendly layer; taking polylactic acid fibers with a linear density of 3.6 dtex and a length of 40 to 52 mm to be processed into a breathable layer, and the breathable layer is provided with breathable holes distributed by mechanical punching;

[0063] (6) The active unwinding device rotates and unwinds, sandwiching the breathable layer between the skin-friendly layer and the functional layer, and sending the three layers together into a hot air penetration dryer for hot melt compounding to form a whole, thereby obtaining the breathable, antibacterial and alcohol-proof medical non-woven fabric; the drying temperature during hot melt compounding is 120° C., the production line speed is 55 m / min, the drying time is 4 min, and the product thickness is 4 mm.

[0064] Comparative Example 1

[0065] A method for preparing a medical nonwoven fabric comprises the following steps:

[0066] (1) adding bentonite to a 3 mol / L hydrochloric acid solution, stirring and then ultrasonically treating for 30 min, standing, filtering, washing, drying, and grinding to obtain pretreated bentonite;

[0067] (2) Disperse 10 g of pretreated bentonite into 200 g of 15 wt% polyallylamine ethanol solution, then add 15 g of triethylamine, stir and disperse evenly, slowly dropwise add 127 g of 8 wt% dialdehyde chitosan solution (dialdehyde chitosan is dissolved in acetic acid-sodium acetate buffer with a pH of 5 and a concentration of 0.5 mol / L), continuously introduce nitrogen, and after the dialdehyde chitosan solution is added dropwise, react at 85° C. for 3 h, filter, wash, and dry the product to obtain functionalized bentonite;

[0068] (3) Dispersing 10 g of functionalized bentonite into 100 g of deionized water, adjusting the pH to 4.5, and ultrasonically oscillating for 30 min to obtain an antibacterial solution;

[0069] (4) taking polypropylene fibers, opening, mixing and combing, stacking into a fiber web, stretching, leveling, and spunlacing to obtain a base fabric, spraying an antibacterial liquid on the surface of the base fabric, the spraying pressure is 0.65 MPa, the spraying distance is 15 cm, and the base fabric is dried at 70°C for 5.5 min, and then the base fabric is immersed in a fluorine-containing finishing liquid (2-(perfluorohexyl) ethyl methacrylate monomer, the concentration is 10wt%; the polymerization inhibitor is ferrous sulfate, the molar ratio of the monomer is 300:1; the emulsifier is lauryl alcohol polyoxyethylene ether, the amount is 0.8wt%), and the base fabric is immersed for 10 min according to a bath ratio of 1:15, and then the liquid is squeezed at a pressure of 0.25 MPa, and dried at 80°C for 10 min to obtain the functional layer; processing the hemp fiber into a skin-friendly layer; taking polylactic acid fibers with a linear density of 3.6 dtex and a length of 40 to 52 mm to be processed into a breathable layer, and the breathable layer is provided with breathable holes distributed by mechanical punching;

[0070] (5) The active unwinding device rotates and unwinds, sandwiching the breathable layer between the skin-friendly layer and the functional layer, and sending the three layers together into a hot air penetration dryer for hot melt bonding to form a whole, thereby obtaining the medical non-woven fabric; the drying temperature during hot melt bonding is 120° C., the production line speed is 55 m / min, the drying time is 4 min, and the product thickness is 4 mm.

[0071] Comparative Example 2

[0072] A method for preparing a medical nonwoven fabric comprises the following steps:

[0073] (1) adding bentonite to a 3 mol / L hydrochloric acid solution, stirring and then ultrasonically treating for 30 min, standing, filtering, washing, drying, and grinding to obtain pretreated bentonite;

[0074] (2) dispersing 10 g of pretreated bentonite into 100 g of deionized water, adjusting the pH to 4.5, and ultrasonically oscillating for 30 min to obtain an antibacterial solution;

[0075] (3) taking polypropylene fibers, opening, mixing and combing, stacking into a fiber web, drawing, leveling, and spunlacing to obtain a base fabric, spraying an antibacterial liquid on the surface of the base fabric, the spraying pressure is 0.65 MPa, the spraying distance is 15 cm, and the base fabric is dried at 70°C for 5.5 min, and then the base fabric is immersed in a fluorine-containing finishing liquid (2-(perfluorohexyl) ethyl methacrylate monomer, the concentration is 10wt%; the polymerization inhibitor is ferrous sulfate, the molar ratio of the monomer is 300:1; the emulsifier is lauryl alcohol polyoxyethylene ether, the amount is 0.8wt%), and the base fabric is immersed for 10 min according to a bath ratio of 1:15, and then the liquid is squeezed at a pressure of 0.25 MPa, and dried at 80°C for 10 min to obtain the functional layer; processing the hemp fiber into a skin-friendly layer; taking polylactic acid fibers with a linear density of 3.6 dtex and a length of 40 to 52 mm to be processed into a breathable layer, and the breathable layer is provided with breathable holes distributed by mechanical punching;

[0076] (4) The active unwinding device rotates and unwinds, sandwiching the breathable layer between the skin-friendly layer and the functional layer, and sending the three layers together into a hot air penetration dryer for hot melt bonding to form a whole, thereby obtaining the medical non-woven fabric; the drying temperature during hot melt bonding is 120° C., the production line speed is 55 m / min, the drying time is 4 min, and the product thickness is 4 mm.

[0077] The nonwoven fabrics prepared in Examples 1 to 3 and Comparative Examples 1 to 2 were tested for performance, and the alcohol-proof performance was evaluated with reference to WSP 80.8 (05) (the lowest grade (grade 0, i.e., 100% water) alcohol was dropped on the functional layer surface of the flat nonwoven fabric, the diameter of the droplet was about 5 mm, the volume was about 0.05 ml, and the alcohol was dropped at least 3 places on the nonwoven fabric. If the alcohol did not penetrate the nonwoven fabric within 5 minutes, the next grade of alcohol was replaced). The water permeability test was performed with reference to GB / T 4744-2013. The initial antibacterial property and the antibacterial property after washing 50 times of the nonwoven fabric were tested with reference to GB15979-2002 "Hygiene Standards for Disposable Sanitary Products", 5 groups were paralleled, and the average value was taken. The specific data are shown in Table 1.

[0078] Table 1 Nonwoven fabric performance test results

[0079]

[0080] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A breathable, antibacterial and alcohol-proof medical nonwoven fabric, characterized in that: It comprises a skin-friendly layer, a breathable layer and a functional layer, wherein the breathable layer is arranged between the skin-friendly layer and the functional layer, and the skin-friendly layer, the breathable layer and the functional layer are composited into a whole by hot-melt bonding; The preparation method of the functional layer comprises the following steps: taking functional fibers, opening, mixing and combing, stacking into a fiber web, stretching, leveling, and spunlacing to obtain a base fabric, spraying an antibacterial liquid on the surface of the base fabric, drying it once, and then immersing the base fabric in a fluorine-containing finishing liquid, dipping, squeezing, and drying it twice to obtain the functional layer; the functional fibers are one or more of polypropylene fibers, polyester fibers, and polyamide fibers.

2. The breathable, antibacterial and alcohol-proof medical nonwoven fabric according to claim 1, characterized in that: The skin-friendly layer is made of one or more of cotton fiber, linen fiber, wool fiber, and silk; the breathable layer is made of polylactic acid fiber, and breathable holes are distributed on the breathable layer by mechanical punching.

3. The breathable, antibacterial and alcohol-proof medical nonwoven fabric according to claim 1, characterized in that: In the preparation method of the functional layer, the spraying pressure is 0.5-0.8MPa, the spraying distance is 10-20cm, the primary drying condition is 60-80℃ drying for 3-8min; the bath ratio is 1:10-1:20 and the mixture is immersed for 5-15min, then squeezed out at a pressure of 0.15-0.3MPa, and the secondary drying condition is 60-100℃ drying for 5-15min.

4. The breathable, antibacterial and alcohol-proof medical nonwoven fabric according to claim 1, characterized in that: The method for preparing the antibacterial liquid comprises the following steps: (1) adding bentonite to a hydrochloric acid solution, stirring, ultrasonically treating, standing, filtering, washing, drying, and grinding to obtain pretreated bentonite; (2) dispersing the pretreated bentonite into a polyallylamine ethanol solution, then adding triethylamine, stirring and dispersing the mixture evenly, slowly adding a dialdehyde chitosan solution dropwise, continuously introducing nitrogen, heating the mixture for reaction, filtering, washing, and drying the product to obtain a functionalized bentonite; (3) dispersing the functionalized bentonite in deionized water, then adding copper chloride and sodium borohydride, stirring and reacting under a nitrogen atmosphere, centrifuging, washing, and drying the product to obtain modified bentonite; (4) Dispersing the modified bentonite in deionized water, adjusting the pH, and ultrasonically oscillating to obtain the antibacterial liquid.

5. The breathable, antibacterial and alcohol-proof medical nonwoven fabric according to claim 4, characterized in that: In step (1), the concentration of the hydrochloric acid solution is 1 to 3 mol / L; and the ultrasonic treatment is performed for 10 to 30 min.

6. The breathable, antibacterial and alcohol-proof medical nonwoven fabric according to claim 4, characterized in that: In step (2), the concentration of the polyallylamine ethanol solution is 8-15wt%; the dialdehyde chitosan is dissolved in an acetic acid-sodium acetate buffer solution with a pH of 4-6 and a concentration of 0.01-1 mol / L to obtain a dialdehyde chitosan solution, wherein the concentration of the dialdehyde chitosan solution is 2-8wt%.

7. The breathable, antibacterial and alcohol-proof medical nonwoven fabric according to claim 4, characterized in that: In step (2), the mass ratio of pretreated bentonite, polyallylamine ethanol solution, triethylamine and dialdehyde chitosan solution is 10:80-200:4-15:46-127; the temperature reaction condition is that after the dialdehyde chitosan solution is added dropwise, the reaction is carried out at 70-85°C for 3-6 hours.

8. The breathable, antibacterial and alcohol-proof medical nonwoven fabric according to claim 4, characterized in that: In step (3), the dosage ratio of the functionalized bentonite, deionized water, copper chloride and sodium borohydride is 10:50-100:2-6:15-30, and the stirring reaction condition is stirring the reaction at room temperature for 2-5 hours.

9. The breathable, antibacterial and alcohol-proof medical nonwoven fabric according to claim 4, characterized in that: In step (4), the pH is adjusted to 3-6, and ultrasonic oscillation is performed for 10-30 minutes; the mass ratio of modified bentonite to deionized water is 1:10-20.

10. A method for preparing the breathable, antibacterial and alcohol-proof medical nonwoven fabric according to any one of claims 1 to 9, characterized in that: The method comprises the following steps: an active unwinding device rotates and unwinds, sandwiches the breathable layer between the skin-friendly layer and the functional layer, and sends the three layers together into a hot air penetration dryer for hot-melt compounding to form a whole, so as to obtain the breathable, antibacterial and alcohol-proof medical non-woven fabric; the drying temperature during hot-melt compounding is 100-140°C, the production line speed is 50-60m / min, the drying time is 2-6min, and the product thickness is 1.5-7mm.

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