Breathable waterproof medical fabric and preparation method thereof

Abstract

The invention discloses a breathable waterproof medical fabric and a preparation method thereof, and relates to the technical field of textiles. The breathable waterproof medical fabric prepared by the invention comprises an inner layer, a middle layer and an outer layer from inside to outside, the outer layer is a coumarin derivative film, the middle layer is a polytetrafluoroethylene breathable film, and the inner layer is a modified cotton fabric; the coumarin derivative film has relatively high waterproofness and oxidation resistance, so that the breathable and waterproof medical fabric is prevented from being oxidized and yellowing; the surface of the modified cotton fabric has a micro-nano coarse structure, and then hydrophobic treatment is performed, so that the modified cotton fabric has excellent hydrophobicity; the modified cotton fabric is completely coated by the polytetrafluoroethylene in the middle layer, so that the hydrophobicity is improved, and the breaking strength is further enhanced; a coumarin derivative is cross-linked, so that the washability of the breathable waterproof medical fabric is enhanced.

Description

Technical Field

[0001] The invention relates to the technical field of textiles, in particular to a breathable and waterproof medical fabric and a preparation method thereof. Background Art

[0002] With the development of the times, people have higher and higher requirements for fabrics. The development of fabrics that can meet consumer needs plays an increasingly important role in the field of fabric production. Existing single-layer textile fabrics can no longer meet people's daily needs, especially in terms of waterproof and breathable performance. Single-layer fabrics have little effect, especially medical fabrics. Medical fabrics have a wide range of uses, such as masks, protective clothing, surgical caps, surgical kits, pillowcases, bed sheets, quilt covers, shoe covers and other disposable medical consumables. Medical fabrics need to have certain special functions to cope with their use environment, such as: antibacterial, liquid-proof, odor absorption, etc.

[0003] Therefore, the present invention processes the single-layer cotton fabric so that it has excellent air permeability and waterproofness, oxidation resistance and washability, so that the medical fabric of the single-layer cotton fabric has a wider application. Summary of the invention

[0004] The object of the present invention is to provide a breathable and waterproof medical fabric and a preparation method thereof to solve the problems raised in the above background technology.

[0005] A breathable and waterproof medical fabric comprises an inner layer, a middle layer and an outer layer from inside to outside; the outer layer is a coumarin derivative film; the inner layer is a modified cotton fabric; and the middle layer is a polytetrafluoroethylene breathable film.

[0006] Preferably, the coumarin derivative film is prepared by coating a double inner layer with a coumarin derivative; the coumarin derivative is prepared by reacting 3-aminocoumarin, triethylamine and chloroacetyl chloride to obtain 2-bromo-2-methyl-N-(3-coumarinyl) propionamide, which is then reacted with phthalic anhydride polyester polyol to obtain the product.

[0007] Preferably, the modified cotton fabric is prepared by immersing the activated cotton fabric in a Tris-HCl buffer solution containing dopamine hydrochloride and nano-ferroferric oxide and cobalt ion metal liquid to obtain metal-modified cotton fabric, and then performing a hydrophobic treatment.

[0008] Preferably, the hydrophobic treatment is to treat the metal-modified cotton fabric with an ethanol solution of heptadecafluorodecyltriethoxysilane.

[0009] Preferably, the method for preparing the breathable and waterproof medical fabric comprises the following specific steps:

[0010] (1) 2-bromo-2-methyl-N-(3-coumarinyl)propionamide, phthalic anhydride polyester polyol and tetrahydrofuran are mixed uniformly in a mass ratio of 1:1:10 to 1:4:20, copper sulfate in an amount of 0.02 to 0.5 times the mass of 2-bromo-2-methyl-N-(3-coumarinyl)propionamide is added, the mixture is stirred at 100 to 200 rpm and room temperature for 1 to 6 hours, and finally concentrated to obtain a coumarin derivative;

[0011] (2) soaking the activated cotton fabric in a metal Tris-HCl buffer solution with a mass of 100 to 200 times that of the activated cotton fabric, stirring the solution at 40 to 42° C. and 200 to 300 rpm for 10 to 12 hours, removing the solution and washing it with deionized water for 3 to 5 times, transferring the solution to a vacuum drying oven at 70 to 80° C. and drying the solution to a constant weight, thereby obtaining a metal-modified cotton fabric;

[0012] (3) soaking the metal-modified cotton fabric in an ethanol solution with a volume ratio of 9:1, stirring at 40-45° C. and 200-300 rpm for 5-15 min, adding 0.02-0.04 times the mass of the ethanol solution of 17fluorodecyltriethoxysilane at a rate of 0.5-1.5 ml / min, continuing the reaction for 5-8 h, taking out and washing with anhydrous ethanol for 3-5 times, and drying in a vacuum drying oven at 70° C. to constant weight, to obtain an inner layer modified cotton fabric;

[0013] (4) The modified cotton fabric is impregnated with polytetrafluoroethylene to form a middle polytetrafluoroethylene membrane; the middle layer is impregnated with a coumarin derivative to form an outer coumarin derivative membrane, thereby preparing a breathable and waterproof medical fabric.

[0014] Preferably, in the above step (1): the preparation method of 2-bromo-2-methyl-N-(3-coumarinyl)propionamide is: 3-aminocoumarin, dichloromethane and triethylamine are mixed in a mass ratio of 0.8:20:0.9 to 1:25:0.9, stirred evenly in an ice bath, and then 0.3 to 0.5 times the mass of chloroacetyl chloride of 3-aminocoumarin is added, the temperature is raised to room temperature and stirred at 30 to 50 rpm for 4 to 6 hours, filtered and washed with 0.1 mol / L hydrochloric acid, saturated sodium hydroxide solution and saturated brine for 3 to 5 times in sequence, then dried over anhydrous magnesium sulfate and rotary evaporated, and finally recrystallized with 50% by mass anhydrous ethanol to obtain 2-bromo-2-methyl-N-(3-coumarinyl)propionamide.

[0015] Preferably, in the above step (1): the preparation method of phthalic anhydride polyester polyol is: 1,6-hexanediol, phthalic anhydride and dibutyltin dilaurate are mixed in a mass ratio of 1.1:1:0.003-1.5:1:0.005, nitrogen is passed at a rate of 10-20 ml / min and the temperature is raised to 130-140° C., stirring and reacting at 200-400 rpm for 0.5-1 h, and then the temperature is further raised to 170-180° C., xylene with a mass of 0.1-0.3 times that of phthalic anhydride is added, and after reacting for 30-50 min, the temperature is further raised to 220-230° C., and the temperature is kept for 2-3 h, vacuuming and stopping the nitrogen passing, and cooling to 140-150° C. to obtain phthalic anhydride polyester polyol.

[0016] Preferably, in the above step (2), the activation process of the cotton fabric is: immersing the cotton fabric in a sodium hydroxide solution with a mass fraction of 18-20%, reacting for 2-4 hours, taking it out and washing it with deionized water for 5-8 times, and transferring it to a vacuum drying oven for drying.

[0017] Preferably, in the above step (2): the preparation method of the metal Tris-HCl buffer solution is: Tris-HCl buffer solution, dopamine, nano-ferrous oxide and cobalt ion methanol solution with a mass fraction of 0.05-0.1% are mixed in a mass ratio of 100:0.8:0.4:0.5-150:1:0.6:0.7.

[0018] Preferably, in the above step (4), the mass ratio of the inner layer modified cotton fabric, the middle layer polytetrafluoroethylene membrane and the outer layer coumarin derivative membrane is 100:1:3 to 200:2:5.

[0019] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0020] The breathable and waterproof medical fabric prepared by the present invention comprises an inner layer, a middle layer and an outer layer from the inside to the outside; the outer layer is a coumarin derivative film, the middle layer is a polytetrafluoroethylene breathable film, and the inner layer is a modified cotton fabric;

[0021] The coumarin derivative film is prepared by coating a double inner layer with a coumarin derivative; the coumarin derivative is prepared by reacting 3-aminocoumarin, triethylamine and chloroacetyl chloride to obtain 2-bromo-2-methyl-N-(3-coumarinyl) propionamide, which is then reacted with phthalic anhydride polyester polyol; the amide reacts with the alcohol to form an ester, so that the coumarin derivative film has strong waterproof properties and antioxidant properties, thereby preventing the breathable and waterproof medical fabric from oxidizing and turning yellow;

[0022] The modified cotton fabric is prepared by immersing the activated cotton fabric in a Tris-HCl buffer solution containing dopamine hydrochloride and nano-ferroferric oxide and cobalt ion metal liquid to obtain metal-modified cotton fabric, and then subjecting the fabric to a hydrophobic treatment; the hydrophobic treatment is to treat the metal-modified cotton fabric with an ethanol solution of heptadecafluorodecyltriethoxysilane; the surface of the cotton fabric modified with nano-ferroferric oxide and cobalt ions has a rough structure of micro-nano size, and then subjecting the fabric to a hydrophobic treatment to make the modified cotton fabric have excellent hydrophobicity; the middle layer of polytetrafluoroethylene completely covers the modified cotton fabric, which not only improves the hydrophobicity, but also further enhances the breaking strength; and then cross-linking the coumarin derivatives to enhance the washability of the breathable and waterproof medical fabric. DETAILED DESCRIPTION

[0023] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] In order to more clearly illustrate the method provided by the present invention, the following examples are used to describe in detail the test methods of various indicators of the breathable and waterproof medical fabrics prepared in the examples and comparative examples as follows:

[0025] Waterproofness: The breathable and waterproof medical fabrics prepared in the examples and comparative examples were tested for water resistance according to GB / T4744;

[0026] Antioxidation: The breathable and waterproof medical fabrics prepared in the examples and comparative examples were irradiated with ultraviolet rays for 7 days to observe whether they turned yellow;

[0027] Mechanical properties: The breathable and waterproof medical fabrics prepared in the examples and comparative examples were tested for breaking strength according to GB / T3923.1;

[0028] Washability: The breathable and waterproof medical fabrics prepared in the examples and comparative examples were washed 30 times and then tested for oxidation resistance again.

[0029] Example 1

[0030] (1) 3-aminocoumarin, dichloromethane and triethylamine were mixed in a mass ratio of 0.8:20:0.9, stirred evenly in an ice bath, and then 0.3 times the mass of chloroacetyl chloride of 3-aminocoumarin was added, the temperature was raised to room temperature and stirred at 30 rpm for 4 hours, filtered and washed three times with 0.1 mol / L hydrochloric acid, saturated sodium hydroxide solution and saturated brine in sequence, then dried over anhydrous magnesium sulfate and rotary evaporated, and finally recrystallized with 50% anhydrous ethanol to obtain 2-bromo-2-methyl-N-(3-coumarinyl)propionamide; 1,6-hexanediol, phthalic anhydride and dibutyltin dilaurate were mixed in a mass ratio of 1.1:1:0.003, and stirred at 10 ml / min. The mixture was heated to 130°C at a rate of nitrogen, stirred at 200 rpm for reaction for 0.5 h, then heated to 170°C, xylene (0.1 times the mass of phthalic anhydride) was added, reacted for 30 min, then heated to 220°C, kept warm for 2 h, evacuated and stopped nitrogen, cooled to 140°C, and phthalic anhydride polyester polyol was obtained; 2-bromo-2-methyl-N-(3-coumarinyl)propionamide, phthalic anhydride polyester polyol and tetrahydrofuran were mixed uniformly at a mass ratio of 1:1:10, copper sulfate (0.02 times the mass of 2-bromo-2-methyl-N-(3-coumarinyl)propionamide) was added, stirred at 100 rpm and room temperature for reaction for 1 h, and finally concentrated to obtain a coumarin derivative;

[0031] (2) The cotton fabric was immersed in a sodium hydroxide solution with a mass fraction of 18%, reacted for 2 hours, removed and washed with deionized water for 5 times, and transferred to a vacuum drying oven for drying to obtain an activated cotton fabric; Tris-HCl buffer solution, dopamine, nano-ferrous oxide and a cobalt ion methanol solution with a mass fraction of 0.05% were mixed in a mass ratio of 100:0.8:0.4:0.5 to obtain a metal Tris-HCl buffer solution; the activated cotton fabric was immersed in a metal Tris-HCl buffer solution with a mass fraction of 100 times that of the activated cotton fabric, stirred at 40°C and 200 rpm for reaction for 10 hours, removed and washed with deionized water for 3 times, and transferred to a vacuum drying oven at 70°C to dry to constant weight to obtain a metal-modified cotton fabric;

[0032] (3) The metal-modified cotton fabric was immersed in an ethanol solution with a volume ratio of 9:1, stirred at 40°C and 200 rpm for 5 minutes, and then 0.02 times the mass of 17-fluorodecyltriethoxysilane of the ethanol solution was added at a rate of 0.5 ml / min, and the reaction was continued for 5 hours. After being removed and washed with anhydrous ethanol for 3 times, it was dried in a vacuum drying oven at 70°C to constant weight to obtain an inner layer modified cotton fabric;

[0033] (4) The inner modified cotton fabric is impregnated with polytetrafluoroethylene to form a middle polytetrafluoroethylene membrane; the middle layer is impregnated with a coumarin derivative to form an outer coumarin derivative membrane; the mass ratio of the inner modified cotton fabric, the middle polytetrafluoroethylene membrane and the outer coumarin derivative membrane is 100:1:3, and a breathable and waterproof medical fabric is obtained.

[0034] Example 2

[0035] (1) 3-aminocoumarin, dichloromethane and triethylamine were mixed in a mass ratio of 0.9:23:0.9, stirred evenly in an ice bath, and then 0.4 times the mass of chloroacetyl chloride of 3-aminocoumarin was added, the temperature was raised to room temperature and stirred at 40 rpm for 5 h, filtered and washed with 0.1 mol / L hydrochloric acid, saturated sodium hydroxide solution and saturated brine four times in sequence, then dried over anhydrous magnesium sulfate and rotary evaporated, and finally recrystallized with 50% anhydrous ethanol to obtain 2-bromo-2-methyl-N-(3-coumarinyl) propionamide; 1,6-hexanediol, phthalic anhydride and dibutyltin dilaurate were mixed in a mass ratio of 1.3:1:0.004 and heated at a rate of 15 ml / min. Pass nitrogen and heat to 135°C, stir and react at 300rpm for 0.8h, continue to heat to 175°C, add xylene with a mass of 0.2 times that of phthalic anhydride, react for 40min, continue to heat to 225°C, keep warm for 2-3h, evacuate and stop passing nitrogen, cool to 145°C to obtain phthalic anhydride polyester polyol; mix 2-bromo-2-methyl-N-(3-coumarinyl)propionamide, phthalic anhydride polyester polyol and tetrahydrofuran in a mass ratio of 1:2.5:15, add copper sulfate with a mass of 0.3 times that of 2-bromo-2-methyl-N-(3-coumarinyl)propionamide, stir and react at 150rpm and room temperature for 4h, and finally concentrate to obtain a coumarin derivative;

[0036] (2) The cotton fabric was immersed in a sodium hydroxide solution with a mass fraction of 19%, reacted for 3 hours, removed and washed with deionized water for 6 times, and transferred to a vacuum drying oven for drying to obtain an activated cotton fabric; Tris-HCl buffer solution, dopamine, nano-ferrous oxide and a cobalt ion methanol solution with a mass fraction of 0.08% were mixed in a mass ratio of 130:0.9:0.5:0.6 to obtain a metal Tris-HCl buffer solution; the activated cotton fabric was immersed in a metal Tris-HCl buffer solution with a mass fraction of 150 times that of the activated cotton fabric, stirred at 41°C and 250rpm for reaction for 10 to 12 hours, removed and washed with deionized water for 4 times, and transferred to a vacuum drying oven at 75°C for drying to constant weight to obtain a metal-modified cotton fabric;

[0037] (3) The metal-modified cotton fabric was immersed in an ethanol solution with a volume ratio of 9:1, stirred at 43°C and 250 rpm for 10 min, and then 0.03 times the mass of 17fluorodecyltriethoxysilane of the ethanol solution was added at a rate of 1 ml / min, and the reaction was continued for 6 h. After being removed and washed with anhydrous ethanol for 3 to 5 times, it was dried in a vacuum drying oven at 70°C to constant weight to obtain an inner layer modified cotton fabric;

[0038] (4) The inner modified cotton fabric is impregnated with polytetrafluoroethylene to form a middle polytetrafluoroethylene membrane; the middle layer is impregnated with a coumarin derivative to form an outer coumarin derivative membrane; the mass ratio of the inner modified cotton fabric, the middle polytetrafluoroethylene membrane and the outer coumarin derivative membrane is 150:1.5:4, and a breathable and waterproof medical fabric is obtained.

[0039] Example 3

[0040] (1) 3-aminocoumarin, dichloromethane and triethylamine were mixed in a mass ratio of 1:25:0.9, stirred evenly in an ice bath, and then 0.5 times the mass of chloroacetyl chloride of 3-aminocoumarin was added, the temperature was raised to room temperature and stirred at 50 rpm for 6 hours, filtered and washed with 0.1 mol / L hydrochloric acid, saturated sodium hydroxide solution and saturated brine for 5 times in sequence, then dried over anhydrous magnesium sulfate and rotary evaporated, and finally recrystallized with 50% anhydrous ethanol to obtain 2-bromo-2-methyl-N-(3-coumarinyl)propionamide; 1,6-hexanediol, phthalic anhydride and dibutyltin dilaurate were mixed in a mass ratio of 1.5:1:0.005, and stirred at 20 ml / min. The mixture was heated to 140°C at a rate of nitrogen, stirred at 400 rpm for reaction for 1 hour, and then heated to 180°C, and xylene with a mass of 0.3 times that of phthalic anhydride was added. After reaction for 50 minutes, the mixture was heated to 230°C and kept warm for 3 hours. The mixture was evacuated and the nitrogen was stopped, and then cooled to 150°C to obtain phthalic anhydride polyester polyol. 2-bromo-2-methyl-N-(3-coumarinyl)propionamide, phthalic anhydride polyester polyol and tetrahydrofuran were mixed uniformly at a mass ratio of 1:4:20, and copper sulfate with a mass of 0.5 times that of 2-bromo-2-methyl-N-(3-coumarinyl)propionamide was added, and the mixture was stirred at 200 rpm and room temperature for reaction for 6 hours. Finally, the mixture was concentrated to obtain a coumarin derivative.

[0041] (2) The cotton fabric was immersed in a 20% sodium hydroxide solution, reacted for 4 hours, removed and washed with deionized water for 8 times, and transferred to a vacuum drying oven for drying to obtain an activated cotton fabric; Tris-HCl buffer solution, dopamine, nano-ferrous oxide and 0.1% cobalt ion methanol solution were mixed in a mass ratio of 150:1:0.6:0.7 to obtain a metal Tris-HCl buffer solution; the activated cotton fabric was immersed in a metal Tris-HCl buffer solution with a mass of 200 times that of the activated cotton fabric, stirred at 42°C and 300 rpm for 12 hours, removed and washed with deionized water for 5 times, and transferred to a vacuum drying oven at 80°C to dry to constant weight to obtain a metal-modified cotton fabric;

[0042] (3) The metal-modified cotton fabric was immersed in an ethanol solution with a volume ratio of 9:1, stirred at 45°C and 300 rpm for 15 min, and then 0.04 times the mass of 17fluorodecyltriethoxysilane of the ethanol solution was added at a rate of 1.5 ml / min. The reaction was continued for 8 h, and the fabric was taken out and washed with anhydrous ethanol for 5 times, and then dried in a vacuum drying oven at 70°C to constant weight to obtain an inner layer modified cotton fabric;

[0043] (4) The inner modified cotton fabric is impregnated with polytetrafluoroethylene to form a middle polytetrafluoroethylene membrane; the middle layer is impregnated with a coumarin derivative to form an outer coumarin derivative membrane; the mass ratio of the inner modified cotton fabric, the middle polytetrafluoroethylene membrane and the outer coumarin derivative membrane is 200:2:5, and a breathable and waterproof medical fabric is obtained.

[0044] Comparative Example 1

[0045] The prescription composition of comparative example 1 is the same as that of example 2. The preparation method of the breathable and waterproof medical fabric is different from that of example 2 only in step (1), and step (1) is modified as follows: 3-aminocoumarin, dichloromethane and triethylamine are mixed in a mass ratio of 0.9:23:0.9, stirred evenly in an ice bath, and then 0.4 times the mass of chloroacetyl chloride of 3-aminocoumarin is added, the temperature is raised to room temperature, stirred at 40 rpm for 5 hours, filtered and washed with 0.1 mol / L hydrochloric acid, saturated sodium hydroxide solution and saturated salt water for 4 times in sequence, then dried over anhydrous magnesium sulfate and rotary evaporated, and finally recrystallized with 50% by mass anhydrous ethanol to obtain 2-bromo-2-methyl-N-(3-coumarinyl) propionamide, which is a coumarin derivative; the remaining steps are the same as those of example 2.

[0046] Comparative Example 2

[0047] The prescription composition of comparative example 2 is the same as that of example 2. The difference between the preparation method of the breathable and waterproof medical fabric and example 2 is that only 3-aminocoumarin is used to prepare the outer coumarin derivative film; 3-aminocoumarin.

[0048] Comparative Example 3

[0049] The prescription composition of comparative example 3 is the same as that of example 2. The preparation method of the breathable and waterproof medical fabric is different from that of example 2 only in step (2), and step (2) is modified as follows: soaking the cotton fabric in a sodium hydroxide solution with a mass fraction of 19%, reacting for 3 hours, taking it out and washing it with deionized water for 6 times, transferring it to a vacuum drying oven for drying, and obtaining an activated cotton fabric; mixing Tris-HCl buffer solution, dopamine, and nano-ferrous oxide in a mass ratio of 130:0.9:0.5 to obtain a metal Tris-HCl buffer solution; soaking the activated cotton fabric in a metal Tris-HCl buffer solution with a mass of 150 times that of the activated cotton fabric, stirring and reacting at 41°C and 250rpm for 10 to 12 hours, taking it out and washing it with deionized water for 4 times, transferring it to a vacuum drying oven at 75°C and drying it to constant weight, and obtaining a metal-modified cotton fabric; the remaining steps are the same as those of example 2.

[0050] Comparative Example 4

[0051] The prescription composition of Comparative Example 4 is the same as that of Example 2. The preparation method of the breathable and waterproof medical fabric is different from that of Example 2 only in step (2), and step (2) is modified as follows: soaking the cotton fabric in a sodium hydroxide solution with a mass fraction of 19%, reacting for 3 hours, taking it out and washing it with deionized water for 6 times, transferring it to a vacuum drying oven for drying, and obtaining an activated cotton fabric; mixing Tris-HCl buffer solution, dopamine and a cobalt ion methanol solution with a mass fraction of 0.08% in a mass ratio of 130:0.9:0.6 to obtain a metal Tris-HCl buffer solution; soaking the activated cotton fabric in a metal Tris-HCl buffer solution with a mass fraction of 150 times that of the activated cotton fabric, stirring and reacting at 41°C and 250 rpm for 10 to 12 hours, taking it out and washing it with deionized water for 4 times, transferring it to a vacuum drying oven at 75°C and drying it to constant weight, and obtaining a metal-modified cotton fabric; the remaining steps are the same as those of Example 2.

[0052] Comparative Example 5

[0053] The prescription composition of comparative example 5 is the same as that of example 2. The difference between the preparation method of the breathable and waterproof medical fabric and example 2 is that the modified cotton fabric is not prepared, and the metal-modified cotton fabric is the inner layer; the remaining steps are the same as those of example 2.

[0054] Comparative Example 6

[0055] The breathable and waterproof medical fabric prepared in Comparative Example 6 is an untreated cotton fabric.

[0056] Effect example

[0057] Table 1 below shows the performance analysis results of the breathable and waterproof medical fabrics of Examples 1-3 and Comparative Examples 1-6 of the present invention:

[0058] Table 1

[0059]

[0060] By comparing the experimental data of the embodiments and the comparative examples in Table 1, it can be clearly found that the breathable and waterproof medical fabrics prepared in Examples 1, 2 and 3 have good waterproofness, mechanical properties, oxidation resistance and washability.

[0061] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations within the meaning and scope of the equivalent elements of the claims be included in the invention. Any marking in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A breathable and waterproof medical fabric, characterized in that: The breathable and waterproof medical fabric comprises an inner layer, a middle layer and an outer layer from the inside to the outside; the outer layer is a coumarin derivative film; the inner layer is a modified cotton fabric; and the middle layer is a polytetrafluoroethylene breathable film.

2. A breathable and waterproof medical fabric according to claim 1, characterized in that: The coumarin derivative film is prepared by coating a double inner layer with a coumarin derivative; the coumarin derivative is prepared by reacting 3-aminocoumarin, triethylamine and chloroacetyl chloride to obtain 2-bromo-2-methyl-N-(3-coumarinyl) propionamide, which is then reacted with phthalic anhydride polyester polyol.

3. The breathable and waterproof medical fabric according to claim 1, characterized in that: The modified cotton fabric is prepared by immersing the activated cotton fabric in a Tris-HCl buffer solution containing dopamine hydrochloride and nano-ferroferric oxide and cobalt ion metal liquid to obtain metal-modified cotton fabric, and then performing hydrophobic treatment.

4. A breathable and waterproof medical fabric according to claim 3, characterized in that: The hydrophobic treatment is to treat the metal-modified cotton fabric with an ethanol solution of heptadecafluorodecyltriethoxysilane.

5. A method for preparing a breathable and waterproof medical fabric, characterized in that: The method for preparing the breathable and waterproof medical fabric comprises the following specific steps: (1) 2-bromo-2-methyl-N-(3-coumarinyl)propionamide, phthalic anhydride polyester polyol and tetrahydrofuran are mixed uniformly in a mass ratio of 1:1:10 to 1:4:20, copper sulfate in an amount of 0.02 to 0.5 times the mass of 2-bromo-2-methyl-N-(3-coumarinyl)propionamide is added, the mixture is stirred at 100 to 200 rpm and room temperature for 1 to 6 hours, and finally concentrated to obtain a coumarin derivative; (2) soaking the activated cotton fabric in a metal Tris-HCl buffer solution with a mass of 100 to 200 times that of the activated cotton fabric, stirring the solution at 40 to 42° C. and 200 to 300 rpm for 10 to 12 hours, removing the solution and washing it with deionized water for 3 to 5 times, transferring the solution to a vacuum drying oven at 70 to 80° C. and drying the solution to a constant weight, thereby obtaining a metal-modified cotton fabric; (3) soaking the metal-modified cotton fabric in an ethanol solution with a volume ratio of 9:1, stirring at 40-45° C. and 200-300 rpm for 5-15 min, adding 0.02-0.04 times the mass of the ethanol solution of 17fluorodecyltriethoxysilane at a rate of 0.5-1.5 ml / min, continuing the reaction for 5-8 h, taking out and washing with anhydrous ethanol for 3-5 times, and drying in a vacuum drying oven at 70° C. to constant weight, to obtain an inner layer modified cotton fabric; (4) The modified cotton fabric is impregnated with polytetrafluoroethylene to form a middle polytetrafluoroethylene membrane; the middle layer is impregnated with a coumarin derivative to form an outer coumarin derivative membrane, thereby preparing a breathable and waterproof medical fabric.

6. The method for preparing a breathable and waterproof medical fabric according to claim 5, characterized in that: In the above step (1), the preparation method of 2-bromo-2-methyl-N-(3-coumarinyl)propionamide is as follows: 3-aminocoumarin, dichloromethane and triethylamine are mixed in a mass ratio of 0.8:20:0.9 to 1:25:0.9, stirred evenly in an ice bath, and then 0.3 to 0.5 times the mass of chloroacetyl chloride of 3-aminocoumarin is added, the temperature is raised to room temperature, and the reaction is stirred at 30 to 50 rpm for 4 to 6 hours, filtered and washed with 0.1 mol / L hydrochloric acid, saturated sodium hydroxide solution and saturated brine for 3 to 5 times in sequence, then dried over anhydrous magnesium sulfate and rotary evaporated, and finally recrystallized with 50% by mass anhydrous ethanol to obtain 2-bromo-2-methyl-N-(3-coumarinyl)propionamide.

7. The method for preparing a breathable and waterproof medical fabric according to claim 5, characterized in that: In the above step (1), the preparation method of phthalic anhydride polyester polyol is as follows: 1,6-hexanediol, phthalic anhydride and dibutyltin dilaurate are mixed in a mass ratio of 1.1:1:0.003-1.5:1:0.005, nitrogen is introduced at a rate of 10-20 ml / min and the temperature is raised to 130-140° C., stirring and reacting at 200-400 rpm for 0.5-1 h, and then the temperature is further raised to 170-180° C., xylene in an amount of 0.1-0.3 times the mass of phthalic anhydride is added, and after reacting for 30-50 min, the temperature is further raised to 220-230° C., and the temperature is kept for 2-3 h, vacuuming and stopping the introduction of nitrogen, and cooling to 140-150° C. to obtain phthalic anhydride polyester polyol.

8. The method for preparing a breathable and waterproof medical fabric according to claim 5, characterized in that: In the above step (2), the activation process of the cotton fabric is as follows: immersing the cotton fabric in a sodium hydroxide solution with a mass fraction of 18-20%, reacting for 2-4 hours, taking it out and washing it with deionized water for 5-8 times, and transferring it to a vacuum drying oven for drying.

9. The method for preparing a breathable and waterproof medical fabric according to claim 5, characterized in that: In the above step (2), the preparation method of the metal Tris-HCl buffer solution is as follows: Tris-HCl buffer solution, dopamine, nano-ferroferric oxide and a cobalt ion methanol solution with a mass fraction of 0.05-0.1% are uniformly mixed in a mass ratio of 100:0.8:0.4:0.5-150:1:0.6:0.

7.

10. The method for preparing a breathable and waterproof medical fabric according to claim 5, characterized in that: In the above step (4), the mass ratio of the inner layer modified cotton fabric, the middle layer polytetrafluoroethylene membrane and the outer layer coumarin derivative membrane is 100:1:3 to 200:2:5.

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