A breathable, antibacterial, and alcohol-resistant medical nonwoven fabric and its preparation method

Abstract

This invention discloses a breathable, antibacterial, and alcohol-resistant medical nonwoven fabric and its preparation method, relating to the field of nonwoven fabric technology. The breathable, antibacterial, and alcohol-resistant medical nonwoven fabric includes a skin-friendly layer, a breathable layer, and a functional layer. The breathable layer is disposed between the skin-friendly layer and the functional layer. The skin-friendly layer, breathable layer, and functional layer are thermally bonded together as a whole. The functional layer is obtained by spraying an antibacterial liquid onto the surface of a base fabric and then impregnating it with a fluorinated finishing liquid. This invention, by setting a three-layer structure of skin-friendly layer, breathable layer, and functional layer, and by treating the functional layer with antibacterial and alcohol-resistant properties to give it excellent antibacterial and alcohol-resistant properties, and by mechanically perforating the breathable layer to achieve a breathable effect, finally obtains a composite nonwoven fabric through thermal bonding. The resulting composite nonwoven fabric has a good feel, is skin-friendly, and dry, while also possessing excellent breathability, antibacterial, and alcohol-resistant effects.

Description

Technical Field

[0001] This invention relates to the field of nonwoven fabric technology, specifically to a breathable, antibacterial, and alcohol-resistant medical nonwoven fabric and its preparation method. Background Technology

[0002] Nonwoven fabrics, also known as non-woven textiles, are fabric-like materials made from randomly or directional fibers without using traditional weaving methods. Nonwoven fabrics integrate the fundamental knowledge and theories of modern mechanics, chemistry, and physics, and utilize various technologies such as chemical fibers, textiles, plastics, chemicals, dyeing and finishing, and papermaking, making it a sunrise discipline in the textile industry. Based on different customer needs, and through process design and rational scientific structural design, various nonwoven products for clothing and industrial use can be produced. Nonwoven products have unique functions and can replace some traditional textiles.

[0003] Nonwoven fabrics are a new generation of environmentally friendly materials, characterized by recyclability, rich colors, low price, non-toxicity, non-irritation, easy decomposition, softness, non-flammability, light weight, breathability, and moisture resistance. Medical nonwoven fabrics outperform traditional pure cotton woven fabrics in terms of compatibility with other materials, hygiene, surgical infection rate, and barrier properties.

[0004] Polypropylene (PP) nonwoven fabric boasts advantages such as high strength, excellent protective performance, breathability, comfort, environmental friendliness, and non-toxicity. It is currently widely used in the medical and health field, including surgical gowns, caps, surgical drapes, surgical covers, antibacterial bandages, and protective clothing. Therefore, the market has placed higher demands on the antibacterial properties of PP-based nonwoven fabrics. Currently, the main processing methods for PP-based nonwoven fabrics with antibacterial functions are additive methods and finishing methods. Antibacterial fabrics produced by the additive method are characterized by wash resistance and long-lasting antibacterial efficacy, making them more suitable for non-disposable antibacterial fiber products. Antibacterial fabrics produced by the finishing method are not wash-resistant, and their antibacterial efficacy typically weakens with each wash. However, for nonwoven fabrics, which are generally used as disposable textiles, the finishing method offers advantages in terms of effectiveness and low cost. Therefore, endowing nonwoven fabrics with antibacterial properties through finishing technology has high market value.

[0005] Chinese patent document CN112192915A discloses a method for preparing a medical antibacterial composite nonwoven fabric. The composite nonwoven fabric includes a waterproof layer, an absorbent layer, and a contact layer. The waterproof layer is a nonwoven fabric that has undergone antibacterial and hydrophobic treatment. The absorbent layer is a nonwoven fabric made of polypropylene fibers and superabsorbent resin through a hydroentangling process. The contact layer is an antibacterial and soft nonwoven fabric. The waterproof layer, absorbent layer, and contact layer are bonded together by hot pressing. The antibacterial, oil-proof, and alcohol-proof properties of existing medical composite nonwoven fabrics still need to be improved. Summary of the Invention

[0006] To address the shortcomings of existing technologies, the present invention aims to provide a breathable, antibacterial, and alcohol-resistant medical nonwoven fabric and its preparation method. The invention employs a three-layer structure consisting of a skin-friendly layer, a breathable layer, and a functional layer. The functional layer is treated with antibacterial and alcohol-resistant agents to impart excellent antibacterial and alcohol-resistant properties. The breathable layer is mechanically perforated to achieve breathability. Finally, the composite nonwoven fabric is obtained through heat fusion. The resulting composite nonwoven fabric has a good hand feel, is skin-friendly, and dry, while also possessing excellent breathability, antibacterial properties, and alcohol resistance.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A breathable, antibacterial, and alcohol-resistant medical nonwoven fabric includes a skin-friendly layer, a breathable layer, and a functional layer. The breathable layer is disposed between the skin-friendly layer and the functional layer. The skin-friendly layer, the breathable layer, and the functional layer are thermally melt-bonded into a whole.

[0009] The method for preparing the functional layer includes the following steps: taking functional fibers, opening, mixing and combing, stacking into a fiber web, stretching, leveling, and hydroentangling to obtain a base fabric, spraying an antibacterial liquid onto the surface of the base fabric, drying it once, and then immersing the base fabric in a fluorinated finishing liquid, impregnating, padding, and drying it a second time to obtain the functional layer; the functional fibers are one or more of polypropylene fibers, polyester fibers, and polyamide fibers.

[0010] Preferably, the fluorinated finishing solution is an emulsion prepared using a fluorinated monomer reagent, wherein the fluorinated monomer reagent is a perfluoroalkyl acrylate monomer and / or a perfluoroalkyl acrylate monomer derivative, and the concentration of the fluorinated monomer reagent is 5~20wt%; the fluorinated 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 ), where R is H or an alkyl group with a chain length of 1 to 8, and x and n range from 1 to 8.

[0011] Preferably, the emulsion prepared using the fluorinated monomer reagent further includes a polymerization inhibitor and an emulsifier; the polymerization inhibitor is a ferrous salt and / or a copper salt; the molar ratio of the polymerization inhibitor to the fluorinated monomer reagent is 0~1000:1; the emulsifier is a cationic surfactant and / or a nonionic surfactant, and the amount of emulsifier is 0.2~2wt%.

[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 has breathable holes distributed by mechanical perforation.

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

[0014] Preferably, in the preparation method of the functional layer, the spraying pressure is 0.5~0.8MPa, the spraying distance is 10~20cm, the first drying condition is drying at 60~80℃ for 3~8min; the liquid is immersed at a bath ratio of 1:10~1:20 for 5~15min, then rolled under a pressure of 0.15~0.3MPa, and the second drying condition is drying at 60~100℃ for 5~15min.

[0015] Preferably, the method for preparing the antibacterial solution includes the following steps:

[0016] (1) Add bentonite to hydrochloric acid solution, stir and sonicate, let stand, filter, wash, dry and grind to obtain pretreated bentonite;

[0017] (2) Disperse the pretreated bentonite into a polyallylamine ethanol solution, then add triethylamine, stir and disperse evenly, slowly add dialdehyde chitosan solution, continuously pass nitrogen gas, heat and react, filter, wash and dry the product to obtain functionalized bentonite;

[0018] (3) Disperse the functionalized bentonite in deionized water, then add copper chloride and sodium borohydride, stir the reaction under nitrogen atmosphere, centrifuge, wash and dry the product to obtain modified bentonite;

[0019] (4) Disperse the modified bentonite into deionized water, adjust the pH, and sonicate to obtain the antibacterial solution.

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

[0021] Preferably, in step (2), the concentration of the polyallylamine ethanol solution is 8~15wt%; the dialdehyde chitosan is dissolved in an acetate-sodium acetate buffer solution with a pH of 4~6 and a concentration of 0.01~1mol / L to obtain a dialdehyde chitosan solution with a concentration of 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 conditions are 70~85℃ for 3~6h after the dialdehyde chitosan solution is added dropwise.

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

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

[0025] This invention also claims a method for preparing the breathable, antibacterial, and alcohol-resistant medical nonwoven fabric, comprising the following steps: an active unwinding device rotates to unwind, 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 lamination to form a whole, thereby obtaining the breathable, antibacterial, and alcohol-resistant medical nonwoven fabric; the drying temperature during hot-melt lamination is 100~140℃, 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) This invention provides a breathable, antibacterial, and alcohol-resistant medical nonwoven fabric. It has a three-layer structure consisting of a skin-friendly layer, a breathable layer, and a functional layer. The functional layer is treated with antibacterial and organic fluorine finishing to give it excellent antibacterial and alcohol-resistant properties. The breathable layer is mechanically perforated to make it breathable. Finally, the composite nonwoven fabric is obtained by hot melting. The resulting composite nonwoven fabric has a good hand feel, is skin-friendly and dry, and also has excellent breathability, antibacterial and alcohol-resistant effects.

[0028] 2) This invention provides a modified bentonite, which is first pretreated with hydrochloric acid, utilizing the H+ in the acid solution... + By replacing cations within bentonite, removing clogging impurities, and unblocking the internal pores of the bentonite, the pore size and porosity of the bentonite are effectively increased, and the surface area of ​​the bentonite is enlarged, providing a large number of active sites for subsequent reactions. Subsequently, polyallylamine, which has strong adsorption properties, is first fixed on the bentonite surface. Then, under the catalysis of triethylamine, the aldehyde groups of dialdehyde chitosan react with the Schiff bases of the amino groups in polyallylamine, fixing the dialdehyde chitosan on the bentonite surface as an imine complex. Utilizing the positively charged natural polysaccharide, the reaction is effectively... This process enhances the antibacterial and biocompatibility properties of bentonite and ensures the long-term stability of its antibacterial effects. Finally, copper chloride is added, and under the action of sodium borohydride, copper ions are reduced to nano-copper particles. These copper ions can complex with the amino and aldehyde groups on the surface of the functionalized bentonite, effectively preventing the aggregation of copper particles. Nano-copper particles are an inorganic antibacterial material with advantages such as broad-spectrum antibacterial activity, good stability, low toxicity, and no risk of bacterial resistance. They can synergistically exert excellent antibacterial properties with dialdehyde chitosan. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. Of course, the specific embodiments described herein are only for explaining the invention and are not intended to limit the invention.

[0030] Unless otherwise specified, all chemical reagents and materials in this invention are purchased from the market or synthesized from raw materials purchased from the market.

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

[0032] A method for preparing a breathable, antibacterial, and alcohol-resistant medical nonwoven fabric includes the following steps:

[0033] (1) Add bentonite to a 1-3 mol / L hydrochloric acid solution, stir and sonicate for 10-30 min, let stand, filter, wash, dry and grind to obtain pretreated bentonite;

[0034] (2) Disperse 10g of pretreated bentonite into 80-200g of 8-15wt% polyallylamine ethanol solution, then add 4-15g of triethylamine, stir and disperse evenly, and slowly add 46-127g of 2-8wt% dialdehyde chitosan solution (obtained by dissolving dialdehyde chitosan in 0.01-1mol / L acetate-sodium acetate buffer solution at pH 4-6), continuously purging with nitrogen gas, and react at 70-85℃ for 3-6h after the dialdehyde chitosan solution is added, filter, wash and dry the product to obtain functionalized bentonite;

[0035] (3) Disperse 10g of functionalized bentonite into 50-100g of deionized water, then add 2-6g of copper chloride and 15-30g of sodium borohydride, stir the reaction at room temperature for 2-5h, centrifuge, wash and dry the product to obtain modified bentonite;

[0036] (4) Disperse 10g of modified bentonite into 100-200g of deionized water, adjust the pH to 3-6, and sonicate for 10-30 minutes to obtain the antibacterial solution;

[0037] (5) Take one or more of polypropylene fiber, polyester fiber, and polyamide fiber, open, mix and comb, stack into fiber web, stretch, level and hydroentangle to obtain base fabric, spray antibacterial liquid on the surface of base fabric, spray pressure is 0.5~0.8MPa, spray distance is 10~20cm, dry at 60~80℃ for 3~8min, then immerse base fabric in fluorine finishing liquid, soak at bath ratio of 1:10~1:20 for 5~15min, then roll liquid under pressure of 0.15~0.3MPa, dry at 60~100℃ for 5~15min to obtain the functional layer; process one or more of cotton fiber, hemp fiber, wool fiber, and silk into skin-friendly layer; take polylactic acid fiber with linear density of 2.2~4.4dtex and length of 38~65mm into breathable layer, the breathable layer has breathable holes distributed by mechanical perforation;

[0038] (6) The active unwinding device rotates to unwind, sandwiching the breathable layer between the skin-friendly layer and the functional layer. The three layers are then fed into a hot air penetration dryer for hot melt bonding to form a whole, thus obtaining the breathable, antibacterial, and alcohol-resistant medical nonwoven fabric. The drying temperature during hot melt bonding is 100~140℃, the production line speed is 50~60m / min, the drying time is 2~6min, and the product thickness is 1.5~7mm.

[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-resistant medical nonwoven fabric includes the following steps:

[0042] (1) Add bentonite to a 3 mol / L hydrochloric acid solution, stir and sonicate for 30 min, let stand, filter, wash, dry and grind to obtain pretreated bentonite;

[0043] (2) Disperse 10g of pretreated bentonite into 200g of 15wt% polyallylamine ethanol solution, then add 15g of triethylamine, stir and disperse evenly, and slowly add 127g of 8wt% dialdehyde chitosan solution (obtained by dissolving dialdehyde chitosan in 0.5mol / L acetate-sodium acetate buffer solution at pH 5), continuously purging with nitrogen gas, and react at 85℃ for 3h after the dialdehyde chitosan solution is added. Filter, wash and dry the product to obtain functionalized bentonite;

[0044] (3) Disperse 10g of functionalized bentonite into 100g of deionized water, then add 6g of copper chloride and 30g of sodium borohydride, stir and react at room temperature for 5h, centrifuge, wash and dry the product to obtain modified bentonite;

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

[0046] (5) Take polypropylene fibers, open, mix and comb, stack into fiber web, stretch, level and hydroentangle to obtain base fabric, spray antibacterial liquid on the surface of base fabric, spray pressure is 0.65MPa, spray distance is 15cm, dry at 70℃ for 5.5min, then immerse base fabric in fluorine finishing liquid (2-(perfluorohexyl)ethyl methacrylate monomer, concentration is 10wt%; ferrous sulfate is selected as polymerization inhibitor, molar ratio with monomer is 300:1; lauryl alcohol polyoxyethylene ether is selected as emulsifier, amount is 0.8wt%), soak for 10min at a bath ratio of 1:15, then roll the liquid under 0.25MPa pressure, dry at 80℃ for 10min to obtain the functional layer; process hemp fiber into skin-friendly layer; take polylactic acid fiber with linear density of 3.6dtex and length of 40~52mm to process into breathable layer, the breathable layer has breathable holes distributed by mechanical punching;

[0047] (6) The active unwinding device rotates to unwind, sandwiching the breathable layer between the skin-friendly layer and the functional layer. The three layers are then fed into the hot air penetration dryer for hot melt bonding to form a whole, thus obtaining the breathable, antibacterial, and alcohol-resistant medical nonwoven fabric. The drying temperature during hot melt bonding is 120°C, the production line speed is 55m / min, the drying time is 4min, and the product thickness is 4mm.

[0048] Example 2

[0049] A method for preparing a breathable, antibacterial, and alcohol-resistant medical nonwoven fabric includes the following steps:

[0050] (1) Add bentonite to a 2 mol / L hydrochloric acid solution, stir and sonicate for 20 min, let stand, filter, wash, dry and grind to obtain pretreated bentonite;

[0051] (2) Disperse 10g of pretreated bentonite into 140g of 12wt% polyallylamine ethanol solution, then add 9g of triethylamine, stir and disperse evenly, and slowly add 86.5g of 5wt% dialdehyde chitosan solution (obtained by dissolving dialdehyde chitosan in 0.5mol / L acetate-sodium acetate buffer solution at pH 5), continuously purging with nitrogen gas, and react at 80℃ for 4.5h after the dialdehyde chitosan solution is added. Filter, wash and dry the product to obtain functionalized bentonite;

[0052] (3) Disperse 10g of functionalized bentonite into 75g of deionized water, then add 4g of copper chloride and 22g of sodium borohydride, stir the reaction at room temperature for 3.5h, centrifuge, wash and dry the product to obtain modified bentonite;

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

[0054] (5) Take polypropylene fibers, open, mix and comb, stack into fiber web, stretch, level and hydroentangle to obtain base fabric, spray antibacterial liquid on the surface of base fabric, spray pressure is 0.65MPa, spray distance is 15cm, dry at 70℃ for 5.5min, then immerse base fabric in fluorine finishing liquid (2-(perfluorohexyl)ethyl methacrylate monomer, concentration is 10wt%; ferrous sulfate is selected as polymerization inhibitor, molar ratio with monomer is 300:1; lauryl alcohol polyoxyethylene ether is selected as emulsifier, amount is 0.8wt%), soak for 10min at a bath ratio of 1:15, then roll the liquid under 0.25MPa pressure, dry at 80℃ for 10min to obtain the functional layer; process hemp fiber into skin-friendly layer; take polylactic acid fiber with linear density of 3.6dtex and length of 40~52mm to process into breathable layer, the breathable layer has breathable holes distributed by mechanical punching;

[0055] (6) The active unwinding device rotates to unwind, sandwiching the breathable layer between the skin-friendly layer and the functional layer. The three layers are then fed into the hot air penetration dryer for hot melt bonding to form a whole, thus obtaining the breathable, antibacterial, and alcohol-resistant medical nonwoven fabric. The drying temperature during hot melt bonding is 120°C, the production line speed is 55m / min, the drying time is 4min, and the product thickness is 4mm.

[0056] Example 3

[0057] A method for preparing a breathable, antibacterial, and alcohol-resistant medical nonwoven fabric includes the following steps:

[0058] (1) Add bentonite to a 1 mol / L hydrochloric acid solution, stir and sonicate for 10 min, let stand, filter, wash, dry and grind to obtain pretreated bentonite;

[0059] (2) Disperse 10g of pretreated bentonite into 80g of 8wt% polyallylamine ethanol solution, then add 4g of triethylamine, stir and disperse evenly, and slowly add 46g of 2wt% dialdehyde chitosan solution (obtained by dissolving dialdehyde chitosan in 0.5mol / L acetate-sodium acetate buffer solution at pH 5), continuously purging with nitrogen gas. After the dialdehyde chitosan solution is added, react at 70℃ for 6h, filter, wash and dry the product to obtain functionalized bentonite;

[0060] (3) Disperse 10g of functionalized bentonite into 50g of deionized water, then add 2g of copper chloride and 15g of sodium borohydride, stir and react at room temperature for 2h, centrifuge, wash and dry the product to obtain modified bentonite;

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

[0062] (5) Take polypropylene fibers, open, mix and comb, stack into fiber web, stretch, level and hydroentangle to obtain base fabric, spray antibacterial liquid on the surface of base fabric, spray pressure is 0.65MPa, spray distance is 15cm, dry at 70℃ for 5.5min, then immerse base fabric in fluorine finishing liquid (2-(perfluorohexyl)ethyl methacrylate monomer, concentration is 10wt%; ferrous sulfate is selected as polymerization inhibitor, molar ratio with monomer is 300:1; lauryl alcohol polyoxyethylene ether is selected as emulsifier, amount is 0.8wt%), soak for 10min at a bath ratio of 1:15, then roll the liquid under 0.25MPa pressure, dry at 80℃ for 10min to obtain the functional layer; process hemp fiber into skin-friendly layer; take polylactic acid fiber with linear density of 3.6dtex and length of 40~52mm to process into breathable layer, the breathable layer has breathable holes distributed by mechanical punching;

[0063] (6) The active unwinding device rotates to unwind, sandwiching the breathable layer between the skin-friendly layer and the functional layer. The three layers are then fed into the hot air penetration dryer for hot melt bonding to form a whole, thus obtaining the breathable, antibacterial, and alcohol-resistant medical nonwoven fabric. The drying temperature during hot melt bonding is 120°C, the production line speed is 55m / min, the drying time is 4min, and the product thickness is 4mm.

[0064] Comparative Example 1

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

[0066] (1) Add bentonite to a 3 mol / L hydrochloric acid solution, stir and sonicate for 30 min, let stand, filter, wash, dry and grind to obtain pretreated bentonite;

[0067] (2) Disperse 10g of pretreated bentonite into 200g of 15wt% polyallylamine ethanol solution, then add 15g of triethylamine, stir and disperse evenly, and slowly add 127g of 8wt% dialdehyde chitosan solution (obtained by dissolving dialdehyde chitosan in 0.5mol / L acetate-sodium acetate buffer solution at pH 5), continuously purging with nitrogen gas, and react at 85℃ for 3h after the dialdehyde chitosan solution is added. Filter, wash and dry the product to obtain functionalized bentonite;

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

[0069] (4) Take polypropylene fibers, open, mix and comb, stack into fiber web, stretch, level and hydroentangle to obtain base fabric, spray antibacterial liquid on the surface of base fabric, spray pressure is 0.65MPa, spray distance is 15cm, dry at 70℃ for 5.5min, then immerse base fabric in fluorine finishing liquid (2-(perfluorohexyl)ethyl methacrylate monomer, concentration is 10wt%; ferrous sulfate is selected as polymerization inhibitor, molar ratio with monomer is 300:1; lauryl alcohol polyoxyethylene ether is selected as emulsifier, amount is 0.8wt%), soak at bath ratio of 1:15 for 10min, then roll liquid under pressure of 0.25MPa, dry at 80℃ for 10min to obtain the functional layer; process hemp fiber into skin-friendly layer; take polylactic acid fiber with linear density of 3.6dtex and length of 40~52mm to process into breathable layer, the breathable layer has breathable holes distributed by mechanical punching;

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

[0071] Comparative Example 2

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

[0073] (1) Add bentonite to a 3 mol / L hydrochloric acid solution, stir and sonicate for 30 min, let stand, filter, wash, dry and grind to obtain pretreated bentonite;

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

[0075] (3) Take polypropylene fiber, open, mix and comb, stack into fiber web, stretch, level and hydroentangle to obtain base fabric, spray antibacterial liquid on the surface of base fabric, spray pressure is 0.65MPa, spray distance is 15cm, dry at 70℃ for 5.5min, then immerse base fabric in fluorine finishing liquid (2-(perfluorohexyl)ethyl methacrylate monomer, concentration is 10wt%; ferrous sulfate is selected as polymerization inhibitor, molar ratio with monomer is 300:1; lauryl alcohol polyoxyethylene ether is selected as emulsifier, amount is 0.8wt%), soak at bath ratio of 1:15 for 10min, then roll liquid under pressure of 0.25MPa, dry at 80℃ for 10min to obtain the functional layer; process hemp fiber into skin-friendly layer; take polylactic acid fiber with linear density of 3.6dtex and length of 40~52mm to process into breathable layer, the breathable layer has breathable holes distributed by mechanical punching;

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

[0077] The performance of the nonwoven fabrics prepared in Examples 1-3 and Comparative Examples 1-2 was tested. The alcohol resistance was evaluated according to WSP 80.8 (05) (the lowest grade (grade 0, i.e., 100% water) of alcohol was dropped onto the functional layer surface of the nonwoven fabric in at least three locations. If the alcohol did not penetrate the nonwoven fabric within 5 minutes, the next grade of alcohol was used). Water resistance was tested according to GB / T 4744-2013. The initial antibacterial properties and antibacterial properties after 50 washes of the nonwoven fabric were tested according to GB 15979-2002 "Hygienic Standard for Disposable Sanitary Products". Five parallel groups were used, and the average value was taken. Specific data are shown in Table 1.

[0078] Table 1. Test Results of Nonwoven Fabric Performance

[0079]

[0080] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A breathable, antibacterial, and alcohol-resistant medical nonwoven fabric, characterized in that, It includes a skin-friendly layer, a breathable layer, and a functional layer, wherein the breathable layer is disposed between the skin-friendly layer and the functional layer, and the skin-friendly layer, the breathable layer, and the functional layer are bonded together as a whole by hot-melt bonding; The method for preparing the functional layer includes the following steps: taking functional fibers, opening, mixing and carding, stacking into a fiber web, stretching, leveling, and hydroentangling to obtain a base fabric, spraying an antibacterial liquid onto the surface of the base fabric, drying it once, and then immersing the base fabric in a fluorinated finishing solution, impregnating, padding, and drying it a second time to obtain the functional layer; the functional fibers are one or more of polypropylene fibers, polyester fibers, and polyamide fibers. The method for preparing the antibacterial solution includes the following steps: (1) Add bentonite to hydrochloric acid solution, stir and sonicate, let stand, filter, wash, dry and grind to obtain pretreated bentonite; (2) Disperse the pretreated bentonite into a polyallylamine ethanol solution, then add triethylamine, stir and disperse evenly, slowly add dialdehyde chitosan solution, continuously pass nitrogen gas, heat and react, filter, wash and dry the product to obtain functionalized bentonite; (3) Disperse the functionalized bentonite in deionized water, then add copper chloride and sodium borohydride, stir the reaction under nitrogen atmosphere, centrifuge, wash and dry the product to obtain modified bentonite; (4) Disperse the modified bentonite into deionized water, adjust the pH, and sonicate to obtain the antibacterial solution.

2. The breathable, antibacterial, and alcohol-resistant 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 the breathable layer has breathable holes distributed by mechanical perforation.

3. The breathable, antibacterial, and alcohol-resistant 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 first drying condition is drying at 60~80℃ for 3~8min; the liquid is immersed at a bath ratio of 1:10~1:20 for 5~15min, then rolled under a pressure of 0.15~0.3MPa, and the second drying condition is drying at 60~100℃ for 5~15min.

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

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

6. The breathable, antibacterial, and alcohol-resistant medical nonwoven fabric according to claim 1, 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 conditions are 70~85℃ for 3~6h after the dialdehyde chitosan solution is added dropwise.

7. The breathable, antibacterial, and alcohol-resistant medical nonwoven fabric according to claim 1, characterized in that, In step (3), the ratio of functionalized bentonite, deionized water, copper chloride, and sodium borohydride is 10:50~100:2~6:15~30, and the stirring reaction is carried out at room temperature for 2~5 hours.

8. The breathable, antibacterial, and alcohol-resistant medical nonwoven fabric according to claim 1, characterized in that, In step (4), adjust the pH to 3-6 and ultrasonically vibrate for 10-30 minutes; the mass ratio of modified bentonite to deionized water is 1:10-20.

9. A method for preparing a breathable, antibacterial, and alcohol-resistant medical nonwoven fabric as described in any one of claims 1 to 8, characterized in that, The process includes the following steps: the active unwinding device rotates to unwind the fabric, sandwiching the breathable layer between the skin-friendly layer and the functional layer, and then sending all three layers together into a hot air penetration dryer for hot-melt bonding to form a whole, thereby obtaining the breathable, antibacterial, and alcohol-resistant medical nonwoven fabric; the drying temperature during hot-melt bonding is 100~140℃, 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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