An alcohol-resistant meltblown non-woven fabric and its preparation method

Abstract

This application relates to the field of functional textiles, and specifically discloses an alcohol-resistant meltblown non-woven fabric and a preparation method thereof. An alcohol-resistant meltblown non-woven fabric includes a base fabric, and the base fabric comprises raw materials in the following weight parts: 100-140 parts of polypropylene particles; 2.5-3.5 parts of electret masterbatch; 9-12 parts of alcohol-resistant masterbatch; 0.9-1.3 parts of solidifying agent; 1.2-1.6 parts of polyvinylidene fluoride; the alcohol-resistant masterbatch includes a three-resistant finishing agent, silica gel particles and a desiccant, and the weight ratio of the three-resistant finishing agent, silica gel particles and desiccant is (6-8):2:(1-2); the base fabric is subjected to dipping and rolling treatment with a dehumidifying slurry. The preparation method is: melt extrusion, spinning, hot air drawing, web laying, electrostatic electret and standing, dipping and rolling treatment, and drying to obtain the alcohol-resistant meltblown non-woven fabric. This application has the effect of improving the alcohol resistance of the non-woven fabric.

Description

Technical Field

[0001] The present application relates to the field of functional non-woven fabrics, and in particular to an alcohol-resistant melt-blown non-woven fabric and a preparation method thereof. Background Art

[0002] Melt-blown polypropylene electret non-woven fabric refers to a non-woven fabric that uses a passive electrode existing between fibers to generate an electrostatic adsorption effect to achieve dust filtration, and is the first choice material for medical protective masks.

[0003] In scenarios such as alcohol disinfection, 75% alcohol will adhere to the surface of the melt-blown polypropylene electret non-woven fabric. Water molecules around and on the surface of the non-woven fabric are miscible with alcohol to form an alcohol solution. The surface tension of the alcohol solution is less than that of water and is easily infiltrated into the interior of the non-woven fabric. The humidity inside the non-woven fabric increases. Due to the charge compensation effect of polar groups in water molecules, opposite ions in the atmosphere, etc., a large amount of charge is lost inside the non-woven fabric, resulting in a reduction in the filtration efficiency of the non-woven fabric for dust and viruses, and a weakening of the protective effect of the non-woven fabric. Summary of the Invention

[0004] In order to make the non-woven fabric less likely to have its protective effect weakened due to alcohol adhesion, the present application provides an alcohol-resistant melt-blown non-woven fabric and a preparation method thereof.

[0005] In a first aspect, an alcohol-resistant melt-blown non-woven fabric provided by the present application adopts the following technical solution:

[0006] An alcohol-resistant melt-blown non-woven fabric includes a base fabric, and the base fabric includes the following raw materials in parts by weight: 100-140 parts of polypropylene particles; 2.5-3.5 parts of electret masterbatch; 9-12 parts of alcohol-resistant masterbatch; 0.9-1.3 parts of solidifying agent; 1.2-1.6 parts of polyvinylidene fluoride; the alcohol-resistant masterbatch includes a three-resistant finishing agent, silica gel particles and a desiccant, and the weight ratio of the three-resistant finishing agent, silica gel particles and desiccant is (6-8):2:(1-2); the alcohol-resistant melt-blown non-woven fabric is obtained by impregnating and rolling the base fabric with a dehumidifying slurry.

[0007] By adopting the above technical solution, during the melting process of each raw material of the non-woven fabric, the three-resistant finishing agent, silica gel particles and desiccant are fully mixed with polypropylene particles to form a melt. After the non-woven fabric is formed, each raw material is evenly distributed in the non-woven fabric. When the non-woven fabric encounters the scenario of 75% alcohol disinfection, the silica gel and three-resistant finishing agent on the non-woven fabric block the entry of moisture into the interior of the non-woven fabric, thereby preventing the increase in humidity inside the non-woven fabric, and further reducing the loss of charge on the non-woven fabric, making the non-woven fabric not easily weakened in its protective effect due to the adhesion of alcohol; the desiccant absorbs water, further reducing the humidity inside the non-woven fabric and reducing the probability of water molecules infiltrating into the interior of the non-woven fabric under the action of alcohol, making the non-woven fabric not easily weakened in its protective effect due to the adhesion of alcohol; the silica gel, as an anti-caking agent and carrier, improves the dispersion uniformity of the three-resistant finishing agent and desiccant, improves the water repellency and dryness of the non-woven fabric, and makes the non-woven fabric not easily weakened in its protective effect due to the adhesion of alcohol.

[0008] Polyvinylidene fluoride is used in combination with electret masterbatch under the action of an electrostatic field. After electric field treatment, the non-woven fabric is charged, enabling the non-woven fabric to filter dust and viruses through electrostatic adsorption. During the use of the non-woven fabric, when it is pressed and bent, charges are generated to supplement the charge loss of the non-woven fabric, thereby improving the filtering effect of the non-woven fabric. In the scenario of alcohol spraying disinfection, the charges generated by the extrusion of the non-woven fabric offset the charges attenuated by the infiltration of water molecules, making the non-woven fabric not easily weakened in its protective effect due to the adhesion of alcohol.

[0009] Optionally, the desiccant is activated alumina.

[0010] By adopting the above technical solution, activated alumina is loaded with a three-resistant finishing agent, which improves the loading rate and loading amount of the three-resistant finishing agent on the non-woven fabric; activated alumina, as a desiccant, its large specific surface area increases the water absorption and storage capacity, reduces the content of free water molecules inside the non-woven fabric, thereby reducing the humidity inside the non-woven fabric, and making the non-woven fabric not easily weakened in its protective effect due to the adhesion of alcohol. When activated alumina and silica gel are used in combination, the silica gel wraps part of the activated alumina, playing a limiting and blocking role, making the activated alumina not easily weakened in its adhesion effect due to water absorption, thereby improving the alcohol resistance of the non-woven fabric.

[0011] Optionally, the preparation of the alcohol-resistant masterbatch includes the following steps: silica gel particles and activated alumina are mixed evenly, a three-resistant finishing agent is added, stirred evenly, subjected to plasma treatment after baking and cooling, and granulated to obtain the alcohol-resistant masterbatch.

[0012] By adopting the above technical solution, during the meltblowing process of the non-woven fabric, each raw material of the alcohol-resistant masterbatch is easily dispersed, and plasma treatment makes the activated alumina, three-resistant finishing agent and silica gel mixed evenly and bonded firmly, facilitating the cooperation of the activated alumina, three-resistant finishing agent and silica gel to play their roles in the non-woven fabric.

[0013] Optionally, the solid electrolyte includes a polymer and graphene oxide, and the weight ratio of the polymer to graphene oxide is (14-15):12.

[0014] By adopting the above technical solution, the polymer enters the interlayer of graphene oxide to form a composite, forming a layer-by-layer conductive network structure inside the non-woven fabric. The charges carried by the non-woven fabric after electretization shuttle between the conductive networks, blocking dust and viruses in multiple directions and improving the filtration efficiency of the non-woven fabric. When the non-woven fabric is used as a mask or a protective suit, graphene oxide absorbs the moisture emitted by the human body, improving the comfort of human use. Graphene oxide fixes the water molecules, reducing the humidity inside the non-woven fabric, thereby reducing the probability of the water molecules dissolving with alcohol to form an alcohol solution and wetting the non-woven fabric, and thus reducing the charge attenuation rate inside the non-woven fabric, making the non-woven fabric not easily weakened in its protective effect due to the adhesion of alcohol.

[0015] Optionally, the polymer is a cationic styrene-acrylic emulsion.

[0016] By adopting the above technical solution, the cations carried by the cationic styrene-acrylic emulsion cooperate with the charges carried by the non-woven fabric to play the roles of sterilization, dust prevention and antistatic. Graphene oxide shows electronegativity, improving the adhesion fastness between the cationic styrene-acrylic emulsion and graphene oxide.

[0017] When water enters the non-woven fabric, the cationic styrene-acrylic emulsion is not hydrophilic, and graphene oxide absorbs water and swells. The composite formed by the cationic styrene-acrylic emulsion and graphene oxide expands the conductive network structure under the action of the volume expansion of graphene oxide to form a three-dimensional space network structure, thereby increasing the water absorption ratio of the composite and facilitating the fixation of the water molecules entering the non-woven fabric. The charges inside the non-woven fabric diffuse, reducing the probability of a large amount of charge loss caused by the compensation effect of the polar groups in the water molecules on the charges on the non-woven fabric, and thus making the non-woven fabric not easily weakened in its protective effect due to the adhesion of alcohol.

[0018] Optionally, the dehumidifying slurry is prepared from 4-cyanobenzoic acid and soybean powder, and the weight ratio of 4-cyanobenzoic acid to soybean powder is 3:2.

[0019] By adopting the above technical solution, after the dehumidifying slurry is pad-rolled on the base fabric, 4-cyanobenzoic acid forms a hydrogen bond with the polypropylene molecules, improving the hydrophobicity of the polypropylene molecules and thus improving the hydrophobicity of the base fabric. At this time, the soybean protein in the soybean powder absorbs and retains water, thus forming a water molecule movement channel on the surface of the base fabric. The water molecules move in the direction of the soybean protein, reducing the contact between the water molecules and the charges on the polypropylene molecules, and thus making the non-woven fabric not easily weakened in its protective effect due to the adhesion of alcohol.

[0020] Optionally, the dehumidifying slurry is prepared from polypyrrole, 4-cyanobenzoic acid, and soybean powder, and the weight ratio of polypyrrole, 4-cyanobenzoic acid, and soybean powder is (10-11):(3-4):2.

[0021] By adopting the above technical solution, in the padding process, polypyrrole is in full contact with graphene oxide, and under the action of the roll pressure, polypyrrole and graphene oxide are first intercalated and then polymerized to form a conductive network, improving the electret efficiency; 4-cyanobenzoic acid is used in combination with polypyrrole to improve the water resistance of polypyrrole. When water molecules enter the non-woven fabric, the conductive efficiency of polypyrrole is not easily weakened under the action of water molecules.

[0022] In a second aspect, a method for preparing an alcohol-resistant meltblown non-woven fabric provided by the present application adopts the following technical solution:

[0023] A method for preparing an alcohol-resistant meltblown non-woven fabric includes the following steps:

[0024] S1. Melting and extrusion;

[0025] S2. Spinning, hot air drawing, and web laying;

[0026] S3. Padding the base fabric with the dehumidifying slurry, and drying to obtain an alcohol-resistant non-woven fabric;

[0027] S4. Electrostatic electret and standing. The alcohol-resistant non-woven fabric is electretized by the corona electret method, and the product is allowed to stand after the electret treatment to obtain an alcohol-resistant meltblown non-woven fabric.

[0028] By adopting the above technical solution, the preparation steps are simple, and the performance of the prepared product is stable.

[0029] A method for preparing an alcohol-resistant meltblown non-woven fabric includes the following steps:

[0030] S1. Melting and extrusion;

[0031] S2. Spinning, hot air drawing, and web laying;

[0032] S3. Padding the base fabric with the dehumidifying slurry, and drying to obtain an alcohol-resistant non-woven fabric;

[0033] S4. Electrostatic electret and standing. The alcohol-resistant non-woven fabric is electretized by the corona electret method, and the product is allowed to stand after the electret treatment to obtain an alcohol-resistant meltblown non-woven fabric.

[0034] By adopting the above technical solution, the preparation steps are simple, and the performance of the prepared product is stable.

[0035] Optionally, S3 includes the following steps:

[0036] S31. Ultrasonically stirring 4-cyanobenzoic acid, soybean powder, and polypyrrole evenly to obtain a pre-soaking solution;

[0037] S32. Impregnate the base fabric with the prepreg solution;

[0038] S33. Wash the base fabric with deionized water and ethanol;

[0039] S34. Dry the base fabric to obtain alcohol-resistant meltblown non-woven fabric.

[0040] By adopting the above technical solution, 4-cyanobenzoic acid, soybean powder and polypyrrole are ultrasonically dispersed evenly, and 4-cyanobenzoic acid is in full contact with and adhered to polypyrrole, improving the water resistance and alcohol resistance of polypyrrole; washing with deionized water and ethanol removes the impurities floating on the surface of the non-woven fabric, improving the quality of the non-woven fabric product.

[0041] In summary, the present application includes at least one of the following beneficial technical effects:

[0042] 1. In the raw materials of the non-woven fabric, the three-resistance finishing agent, silica gel particles, 4-cyanobenzoic acid, etc. cooperate with each other to provide hydrophobic protection for charges, graphene oxide, etc., reducing the probability of water molecules entering the interior of the non-woven fabric and consuming charges; the desiccant, soybean powder and graphene oxide cooperate with each other to absorb and retain water, reducing the content of free water molecules in the non-woven fabric, reducing the consumption of charges by water molecules, and improving the alcohol resistance of the non-woven fabric; styrene-acrylic emulsion and polyvinylidene fluoride cooperate with each other to improve the electret efficiency of the non-woven fabric and the charge amount in the non-woven fabric, reducing the probability of the filtration efficiency of the non-woven fabric failing; the styrene-acrylic emulsion, graphene oxide, polypyrrole and charges in the non-woven fabric cooperate with each other to form a layered conductive network structure, improving the dispersion of charges, thereby improving the filtration efficiency of the non-woven fabric and reducing the probability of water molecules capturing charges; graphene oxide, styrene-acrylic emulsion and water molecules entering the non-woven fabric cooperate to expand the conductive network structure, further improving the filtration efficiency and alcohol resistance of the non-woven fabric, making the non-woven fabric less likely to have its protective effect weakened due to alcohol adhesion.

[0043] 2. The base fabric is impregnated and rolled in the dehumidifying slurry, and the roll pressure promotes the formation of a double-layer mutual transmission network structure between polypyrrole and graphene oxide, facilitating the dispersion of charges in the non-woven fabric, thereby improving the filtration efficiency of the non-woven fabric for dust and viruses, and at the same time increasing the difficulty of water molecules capturing charges, making the non-woven fabric less likely to have its protective effect weakened due to alcohol adhesion.

[0044] 3. Silica gel, as an anti-caking agent and carrier, improves the dispersion uniformity of the three-resistance finishing agent and desiccant, improves the water repellency and dryness of the non-woven fabric, making the non-woven fabric less likely to have its protective effect weakened due to alcohol adhesion.

[0045] 4. Activated alumina and silica gel are used in combination. Silica gel wraps part of the activated alumina, playing a limiting and blocking role, reducing the probability of activated alumina swelling and softening under the action of water molecules.

[0046] 5. Activated alumina is used in combination with a three-resistant finishing agent to fix the free fluoride ions in the non-woven fabric, improving the safety of using the non-woven fabric. Specific Embodiments

[0047] The present application will be further described in detail below with reference to examples and comparative examples.

[0048] In the following examples, those not specified in detail are carried out according to conventional conditions or conditions recommended by the manufacturer. Except as otherwise specified, the raw materials used in the following examples are all commercially available.

[0049] The melt index of the polypropylene granules is 1200 - 1500 g / 10 min, the density is 0.92 g / cm 3 , the melting point is 165 - 175 °C; the melt index of the electret masterbatch is 700 g / 10 min; the glass transition temperature of polyvinylidene fluoride is -40 °C, the melting temperature is 160 - 168 °C, the water absorption rate is < 0.20%, and the tensile modulus (23 °C) is 1000 - 1500 MPa; the three-resistant finishing agent is a six-carbon fluorine-based waterproof and oil-proof finishing agent; the specific surface area of the activated alumina is ≥ 0.38 m 2 / g; the viscosity of the styrene-acrylic emulsion is 4000 CPS, the pH value is 7.0, the particle size is 0.2 μm, and the glass transition temperature is -20 °C; the water content of graphene oxide is < 0.01%, and the particle size is 0.8 - 2 μm; the conductivity of polypyrrole CAS30604-81-0 is 102 - 103 S / cm; the melting point of 4-cyanobenzoic acid is 219 °C, and LogP is 1.56; the particle size of soybean powder is 100 mesh.

[0050] Preparation Example of Alcohol-Resistant Masterbatch

[0051] Preparation Example 1

[0052] S1. Mix 4 kg of silica gel particles and 2 kg of activated alumina evenly to obtain a mixture.

[0053] S2. Add 12 kg of the three-resistant finishing agent to the mixture, stir evenly, bake at 80 °C for 3 min, and then cure at 100 °C for min to obtain alcohol-resistant particles.

[0054] S3. After cooling the alcohol-resistant particles, perform plasma treatment in an atmospheric pressure plasma processor. The plasma treatment is carried out with a frequency set to 13.65 MHz, a time of 15 s, a pressure of 0.2 MPa, a power of 42 W, a carrier gas flow rate of 30 L / min, and an active gas flow rate of 0.02 L / min. After the treatment is completed, granulate and screen to obtain alcohol-resistant masterbatch with a particle size of 1.5 mm.

[0055] Preparation Example 2

[0056] The difference between this Preparation Example and Preparation Example 1 is as follows: 2 kg of silica gel particles, 1.5 kg of activated alumina, and 7 kg of tri-antibacterial finishing agent are added.

[0057] Preparation Example 3

[0058] The difference between this Preparation Example and Preparation Example 1 is as follows: 2 kg of silica gel particles, 2 kg of activated alumina, and 8 kg of tri-antibacterial finishing agent are added.

[0059] Preparation Example 4

[0060] The difference between this Preparation Example and Preparation Example 1 is as follows: 4 kg of silica gel particles, 4 kg of activated alumina, and 12 kg of tri-antibacterial finishing agent are added.

[0061] Preparation Example 5

[0062] The difference between this Preparation Example and Preparation Example 1 is as follows: 4 kg of silica gel particles, 5 kg of activated alumina, and 12 kg of tri-antibacterial finishing agent are added.

[0063] Preparation Example 6

[0064] The difference between this Preparation Example and Preparation Example 1 is as follows: 2 kg of silica gel particles, 1 kg of activated alumina, and 8 kg of tri-antibacterial finishing agent are added.

[0065] Preparation Example 7

[0066] S1. Mix 8 kg of silica gel particles with 6 kg of activated alumina evenly to obtain a mixed material.

[0067] S2. Conduct plasma treatment on the mixed material in an atmospheric pressure plasma processor. The plasma treatment parameters are: frequency set to 13.65 MHz, time 15 s, pressure 0.2 MPa, power 42 W, carrier gas flow rate 30 L / min, active gas flow rate 0.02 L / min. After the treatment, granulate and screen to obtain anti-alcohol masterbatch with a particle size of 1.5 mm.

[0068] Preparation Example 8

[0069] S1. Stir 3 kg of activated alumina and 14 kg of tri-antibacterial finishing agent evenly, bake at 80 °C for 3 min, and then cure at 100 °C for [missing value] min to obtain anti-alcohol particles.

[0070] S2. After cooling the anti-alcohol particles, conduct plasma treatment on them in an atmospheric pressure plasma processor. The plasma treatment parameters are: frequency set to 13.65 MHz, time 15 s, pressure 0.2 MPa, power 42 W, carrier gas flow rate 30 L / min, active gas flow rate 0.02 L / min. After the treatment, granulate and screen to obtain anti-alcohol masterbatch with a particle size of 1.5 mm.

[0071] Preparation Example 9

[0072] S1. Stir 2 kg of silica gel particles and 7 kg of tri-antibody finishing agent evenly, bake at 80 °C for 3 min, and then cure at 100 °C for min to obtain anti-alcohol particles;

[0073] S2. After cooling the anti-alcohol particles, perform plasma treatment in an atmospheric pressure plasma processor. The plasma treatment has a frequency set to 13.65 MHz, a time of 15 s, a pressure of 0.2 MPa, a power of 42 W, a carrier gas flow rate of 30 L / min, and an active gas flow rate of 0.02 L / min. After the treatment is completed, granulate and screen to obtain anti-alcohol masterbatch with a particle size of 1.5 mm.

[0074] Table 1 Raw material table of anti-alcohol masterbatch preparation example (kg)

[0075] Silica gel particles Activated alumina Tri-antibacterial finishing agent Preparation Example 1 4 2 12 Preparation Example 2 2 1.5 7 Preparation Example 3 2 2 8 Preparation Example 4 4 4 12 Preparation Example 5 4 5 12 Preparation Example 6 2 1 8 Preparation Example 7 8 6 / Preparation Example 8 / 3 14 Preparation Example 9 2 / 7

[0076] Solid electrolyte preparation example

[0077] Preparation example 10

[0078] Stir 1 kg of cationic styrene-acrylic emulsion and 0.8 kg of graphene oxide evenly, and ultrasonically disperse for 5 min to obtain a solid electrolyte.

[0079] Preparation example 11

[0080] Stir 0.6 kg of cationic styrene-acrylic emulsion and 0.5 kg of graphene oxide evenly, and ultrasonically disperse for 5 min to obtain a solid electrolyte.

[0081] Preparation example 12

[0082] Stir 0.7 kg of cationic styrene-acrylic emulsion and 0.6 kg of graphene oxide evenly, and ultrasonically disperse for 5 min to obtain a solid electrolyte.

[0083] Preparation example 13

[0084] Take 1.1 kg of graphene oxide as the solid electrolyte.

[0085] Preparation example 14

[0086] Take 1.1 kg of cationic styrene-acrylic emulsion as the solid electrolyte.

[0087] Table 2 Raw material table of solid electrolyte preparation example (kg)

[0088] Cationic styrene-acrylic emulsion Graphene oxide Preparation Example 10 1.0 0.8 Preparation Example 11 0.6 0.5 Preparation Example 12 0.7 0.6 Preparation Example 13 / 1.1 Preparation Example 14 1.1 /

[0089] Example

[0090] Example 1

[0091] S1. Melt extrusion: Mix 100 kg of polypropylene pellets, 2.5 kg of electret masterbatch, 1.6 kg of polyvinylidene fluoride, 9 kg of the anti-alcohol masterbatch prepared in Preparation Example 1, and 0.9 kg of the solid electrolyte prepared in Preparation Example 10 evenly, and batchwise put them into the feed hopper of the non-woven meltblowing machine. Set the meltblowing process temperature in Zone 1 to 210 °C, Zone 2 to 240 °C, and Zones 3 to 5 to 260 °C. Turn on the air compressor and freeze dryer to preheat for more than 30 min. After preheating, turn on the front body air heating switch. After heating to the set temperature, turn on the metering pump to extrude the polymer melt;

[0092] S2. Spinning, hot air drawing and web laying: Set the air flow temperature to 260 °C, the air flow pressure to 0.2 MPa, and the hot air drawing temperature to 260 °C. After web laying, obtain a base fabric of 25 g / m 2 ;

[0093] S3. Humidity reduction slurry padding treatment:

[0094] S31. Stir 100 kg of polypyrrole, 40 kg of 4-cyanobenzoic acid and 20 kg of soybean powder evenly and perform ultrasonic treatment for 5 min as the pre-soaking solution;

[0095] S32. Install a magnetic stirring device in the padding cylinder, pour the pre-soaking solution into the padding cylinder, and pad the base fabric in the pre-soaking solution. Pad the base fabric using a three-padding and three-rolling process to obtain an adhered base fabric;

[0096] S33. Wash the adhered base fabric with ethanol sufficient to submerge the base fabric, and then wash it twice with deionized water sufficient to submerge the base fabric to obtain a wet base fabric;

[0097] S34. Dry the wet base fabric at a constant temperature of 60 °C to obtain alcohol-resistant non-woven fabric;

[0098] S4. Electrostatic electret and standing: Perform electret on the alcohol-resistant non-woven fabric web using the corona electret method. Set the electret static charge to positive electricity, the electrostatic electret to 300 V, the voltage charging time to 5 min, and the charging distance to 5 cm to obtain an electret non-woven fabric; Place the electret non-woven fabric in a standard environment for 24 hours to obtain an alcohol-resistant meltblown non-woven fabric with electrostatic filtration function.

[0099] Example 2

[0100] S1. Melt extrusion: Mix 120 kg of polypropylene pellets, 3 kg of electret masterbatch, 1.4 kg of polyvinylidene fluoride, 10.5 kg of the anti-alcohol masterbatch prepared in Preparation Example 2, and 1.1 kg of the solid electrolyte prepared in Preparation Example 11 evenly, and batchwise put them into the feed hopper of the non-woven meltblowing machine. Set the meltblowing process temperature in Zone 1 to 210 °C, Zone 2 to 240 °C, and Zones 3 to 5 to 260 °C. Turn on the air compressor and freeze dryer to preheat for more than 30 min. After preheating, turn on the front body air heating switch. After heating to the set temperature, turn on the metering pump to extrude the polymer melt;

[0101] S2. Spinning, hot air drawing and web laying. Set the air flow temperature at 260°C, the air flow pressure at 0.2 MPa, set the hot air drawing temperature at 260°C, and obtain a base fabric of 25 g / m² after web laying; 2 after web laying;

[0102] S3. Humidity-reducing slurry padding treatment:

[0103] S31. Stir 160 kg of polypyrrole, 50 kg of 4-cyanobenzoic acid and 30 kg of soybean powder evenly and perform ultrasonic treatment for 5 min as the pre-soaking solution;

[0104] S32. Install a magnetic stirring device in the padding cylinder, pour the pre-soaking solution into the padding cylinder, and immerse the base fabric in the pre-soaking solution. Use the three-padding and three-rolling process to pad the base fabric to obtain an adhered base fabric;

[0105] S33. Wash the adhered base fabric with ethanol sufficient to submerge the base fabric, and then wash it twice with deionized water sufficient to submerge the base fabric to obtain a wet base fabric;

[0106] S34. Dry the wet base fabric at a constant temperature of 60°C to obtain alcohol-resistant non-woven fabric;

[0107] S4. Electrostatic electret and standing. Use the corona electret method to electret the alcohol-resistant non-woven fabric web. Set the electret static charge to positive, the electrostatic electret voltage to 300 V, the voltage charging time to 5 min, and the charging distance to 5 cm to obtain an electret non-woven fabric; Place the electret non-woven fabric in a standard environment for 24 hours to obtain an alcohol-resistant meltblown non-woven fabric with electrostatic filtration function.

[0108] Example 3

[0109] S1. Melt extrusion. Mix 140 kg of polypropylene pellets, 3.5 kg of electret masterbatch, 1.2 kg of polyvinylidene fluoride, 12 kg of alcohol-resistant masterbatch prepared in Preparation Example 3, and 1.3 kg of solidifying agent prepared in Preparation Example 12 evenly, and put them into the feed hopper of the non-woven meltblowing machine in batches. Set the meltblowing process temperature in Zone 1 at 210°C, Zone 2 at 240°C, and Zones 3 to 5 at 260°C. Turn on the air compressor and freeze dryer to preheat for more than 30 min. After preheating, turn on the front body air heating switch. After heating to the set temperature, turn on the metering pump to extrude the polymer melt;

[0110] S2. Spinning, hot air drawing and web laying. Set the air flow temperature at 260°C, the air flow pressure at 0.2 MPa, set the hot air drawing temperature at 260°C, and obtain a base fabric of 25 g / m² after web laying; 2 after web laying;

[0111] S3. Humidity-reducing slurry padding treatment:

[0112] S31. Stir 220 kg of polypyrrole, 60 kg of 4-cyanobenzoic acid and 40 kg of soybean powder evenly and perform ultrasonic treatment for 5 min to obtain a pre-impregnation solution;

[0113] S32. Install a magnetic stirring device in the padding bath, pour the pre-impregnation solution into the padding bath, dip the base fabric in the pre-impregnation solution, and pad the base fabric using a three-padding and three-rolling process to obtain an adhered base fabric;

[0114] S33. Wash the adhered base fabric with ethanol sufficient to submerge the base fabric, and then wash it twice with deionized water sufficient to submerge the base fabric to obtain a wet base fabric;

[0115] S34. Dry the wet base fabric at a constant temperature of 60 °C to obtain an alcohol-resistant non-woven fabric;

[0116] S4. Electrostatic electret and standing. Perform electret on the alcohol-resistant non-woven fabric web using the corona electret method, set the electret static charge to positive, the electrostatic electret to 300 V, the voltage charging for 5 min, and the charging distance to 5 cm to obtain an electret non-woven fabric; Place the electret non-woven fabric in a standard environment for 24 hours to obtain an alcohol-resistant meltblown non-woven fabric with electrostatic filtration function.

[0117] Example 4

[0118] The difference between this example and Example 2 is that 1.6 kg of polyvinylidene fluoride is added.

[0119] Example 5

[0120] The difference between this example and Example 2 is that 1.2 kg of polyvinylidene fluoride is added.

[0121] Example 6

[0122] The difference between this example and Example 2 is that 10.5 kg of the anti-alcohol masterbatch prepared in Preparation Example 1 is added.

[0123] Examples 7 to 10

[0124] The difference between this example and Example 2 is that 10.5 kg of the anti-alcohol masterbatches prepared in Preparation Examples 3 to 6 are added.

[0125] Example 11

[0126] The difference between this example and Example 2 is that 1.1 kg of the solidifying agent prepared in Preparation Example 10 is added.

[0127] Examples 12 to 14

[0128] The difference between this example and Example 2 is that 1.1 kg of the solidifying agents prepared in Preparation Examples 12 to 14 are added.

[0129] Example 15

[0130] The difference between this example and Example 2 is as follows: In S31, 100 kg of polypyrrole, 40 kg of 4-cyanobenzoic acid, and 20 kg of soybean powder are stirred evenly and ultrasonically treated for 5 min to obtain a pre-impregnating solution.

[0131] Example 16

[0132] The difference between this example and Example 2 is as follows: In S31, 220 kg of polypyrrole, 60 kg of 4-cyanobenzoic acid, and 40 kg of soybean powder are stirred evenly and ultrasonically treated for 5 min to obtain a pre-impregnating solution.

[0133] Example 17

[0134] The difference between this example and Example 2 is as follows: In S31, 160 kg of polypyrrole and 30 kg of soybean powder are stirred evenly and ultrasonically treated for 5 min to obtain a pre-impregnating solution.

[0135] Example 18

[0136] The difference between this example and Example 2 is as follows: In S31, 160 kg of polypyrrole and 50 kg of 4-cyanobenzoic acid are stirred evenly and ultrasonically treated for 5 min to obtain a pre-impregnating solution.

[0137] Example 19

[0138] The difference between this example and Example 2 is as follows: In S31, 100 kg of polypyrrole, 30 kg of 4-cyanobenzoic acid, and 20 kg of soybean powder are stirred evenly and ultrasonically treated for 5 min to obtain a pre-impregnating solution.

[0139] Example 20

[0140] The difference between this example and Example 2 is as follows: In S31, 110 kg of polypyrrole, 40 kg of 4-cyanobenzoic acid, and 20 kg of soybean powder are stirred evenly and ultrasonically treated for 5 min to obtain a pre-impregnating solution.

[0141] Example 21

[0142] The difference between this example and Example 2 is as follows: In S31, 30 kg of 4-cyanobenzoic acid and 20 kg of soybean powder are stirred evenly and ultrasonically treated for 5 min to obtain a pre-impregnating solution.

[0143] Comparative example

[0144] Comparative example 1

[0145] The difference between this comparative example and Example 2 is that polyvinylidene fluoride is not added.

[0146] Comparative example 2

[0147] The difference between this comparative example and Example 2 is that no anti-alcohol masterbatch was added.

[0148] Comparative Examples 3 to 5

[0149] The difference between this comparative example and Example 2 is that the anti-alcohol masterbatch was replaced with the anti-alcohol masterbatch prepared in Preparation Examples 7 to 9 at 10.5 kg.

[0150] Comparative Example 6

[0151] The difference between this comparative example and Example 2 is that no solid electrolyte was added.

[0152] Comparative Example 7

[0153] The difference between this comparative example and Example 2 is that the base fabric was not impregnated and rolled with the humidity-reducing sizing.

[0154] Table 3 Raw material table of examples and comparative examples (kg)

[0155]

[0156]

[0157] Performance detection test

[0158] Test method

[0159] 1. The breathing resistance (Pa) of the non-woven fabric was measured by the method in "GB2626-2019 Respiratory protective devices - Self-priming filter type particulate respirators". The test results are shown in Table 4.

[0160] 2. The test method for the filtration efficiency decay rate is as follows:

[0161] (1) The initial filtration efficiency η 1 (%) of the non-woven fabric was measured by the method in "GB2626-2019 Respiratory protective devices - Self-priming filter type particulate respirators";

[0162] (2) The filtration efficiency (%) of the non-woven fabric after treatment was measured by the method in "GB2626-2019 Respiratory protective devices - Self-priming filter type particulate respirators"

[0163] (3) Referring to the method in "GB / T24120-2009 Determination of the properties of textiles against aqueous ethanol solutions", the non-woven fabric was laid flat, and 75% alcohol solution was sprayed at a distance of 2 cm from the surface of the non-woven fabric. The spraying amount was 10% of the weight of the non-woven fabric. After 2 min, the filtration efficiency η 2 (%) of the non-woven fabric after treatment was measured by the method in "GB2626-2019 Respiratory protective devices - Self-priming filter type particulate respirators";

[0164] Filter efficiency decay rate (%), the calculation formula is as follows:

[0165]

[0166] The test results are shown in Table 4 in detail.

[0167] Table 4 Test result data table of each example and comparative example

[0168]

[0169]

[0170] The inspiratory resistance of the alcohol-resistant meltblown non-woven fabric prepared by each example and comparative example meets the requirements for inspiratory resistance in "GB19083-2003 Technical Requirements for Medical Protective Masks" (the inspiratory resistance does not exceed 343.2 Pa).

[0171] Combined with Example 1, Example 2 and Example 3 and combined with Table 4, by adjusting the addition amounts of polypropylene particles, electret masterbatch, polyvinylidene fluoride, anti-alcohol masterbatch, solid electrolyte and polypyrrole, 4-cyano-benzoic acid and soybean powder in the impregnating solution, the non-woven fabric is not easily weakened in protective effect due to alcohol adhesion.

[0172] Combined with Example 2 and Comparative Example 1 and combined with Table 4, it can be seen that the addition of polyvinylidene fluoride improves the filtration efficiency of the non-woven fabric and reduces the filtration efficiency loss rate of the non-woven fabric. After the non-woven fabric is formed, polyvinylidene fluoride is dispersed in the non-woven fabric. Polyvinylidene fluoride has low air permeability, increasing the breathing resistance of the non-woven fabric. The piezoelectricity of polyvinylidene fluoride enables the non-woven fabric to accumulate charges during rubbing and bending, improving the electrostatic adsorption efficiency of the non-woven fabric, thereby improving the filtration efficiency of the non-woven fabric. At the same time, the accumulated charges compensate for the charge loss of the non-woven fabric, reducing the loss of charges of the non-woven fabric by the ethanol solution, thereby reducing the filtration efficiency loss rate of the non-woven fabric.

[0173] Combined with Example 2, Example 4 and Example 5 and combined with Table 4, it can be seen that as the addition amount of polyvinylidene fluoride increases, the filtration efficiency decay rate of the non-woven fabric first decreases and then increases. Polyvinylidene fluoride is difficult to form a film and exists in a granular state in the non-woven fabric. As the addition amount of polyvinylidene fluoride increases, the fluoride ion content in the non-woven fabric increases, increasing the consumption of silica gel, resulting in the swelling and softening of activated alumina under the action of water molecules in the ethanol solution, losing its drying performance, leading to an enhanced compensation effect of water molecules on the charges of the non-woven fabric, serious charge loss of the non-woven fabric, and an increase in the filtration efficiency decay rate of the non-woven fabric.

[0174] Combined with Example 2 and Comparative Example 2 and in conjunction with Table 4, it can be seen that the addition of the anti-alcohol masterbatch effectively reduces the filtration efficiency decay rate of the non-woven fabric. The raw materials of the anti-alcohol masterbatch include a three-resistant finishing agent, silica gel particles, and activated alumina. The three-resistant finishing agent, silica gel particles, and activated alumina are used in combination with polypropylene particles and a solid electrolyte, making the non-woven fabric less likely to have its protective effect weakened due to alcohol adhesion.

[0175] Combined with Example 2, Example 6, and Example 7 and in conjunction with Table 4, it can be seen that by adjusting the proportions of the three-resistant finishing agent, silica gel particles, and activated alumina, the non-woven fabric is less likely to have its protective effect weakened due to alcohol adhesion.

[0176] Combined with Example 2 and Comparative Example 3 and in conjunction with Table 4, it can be seen that the addition of the three-resistant finishing agent reduces the filtration efficiency and the filtration efficiency decay rate of the non-woven fabric. The three-resistant finishing agent is combined with polypropylene particles to improve the hydrophobicity of the polypropylene melt-blown non-woven fabric. Ethanol solution is not easily introduced into the non-woven fabric, thereby reducing the humidity inside the non-woven fabric. The charges inside the non-woven fabric are not easily attenuated due to the action of water molecules in the ethanol solution, thus reducing the filtration efficiency decay rate of the non-woven fabric.

[0177] Combined with Example 2 and Comparative Example 4 and in conjunction with Table 4, it can be seen that the addition of silica gel particles reduces the filtration efficiency decay rate of the non-woven fabric. After the melt-blown process, the silica gel particles are fully dispersed on the non-woven fabric. The silica gel is used in combination with activated alumina and the three-resistant finishing agent to improve the dispersion uniformity of the three-resistant finishing agent and activated alumina, facilitating the three-resistant finishing agent and activated alumina to play their roles, improving the water repellency and dryness of the non-woven fabric, thereby reducing the humidity inside the non-woven fabric. The charges inside the non-woven fabric are not easily attenuated due to the action of water molecules in the ethanol solution, thus reducing the filtration efficiency decay rate of the non-woven fabric.

[0178] Combined with Example 2 and Comparative Example 5 and in conjunction with Table 4, it can be seen that the addition of activated alumina reduces the filtration efficiency decay rate of the non-woven fabric. The large specific surface area of activated alumina increases the water absorption and storage capacity, making it difficult for water molecules entering the non-woven fabric to escape. In addition, the silica gel and activated alumina are used in combination, and the silica gel wraps part of the activated alumina, playing a limiting and blocking role, reducing the probability of activated alumina swelling and softening under the action of water molecules, improving the utilization efficiency of activated alumina, and reducing the filtration efficiency decay rate of the non-woven fabric.

[0179] Combined with Example 6, Example 8, and Example 9 and in conjunction with Table 4, it can be seen that as the proportion of activated alumina in the anti-alcohol masterbatch increases, the filtration efficiency decay rate of the non-woven fabric first decreases and then increases. With the increase in the proportion of activated alumina, the adsorption effect of the non-woven fabric on dust, moisture, and viruses is enhanced, manifested as an increase in the filtration efficiency of the non-woven fabric. After treatment in ethanol solution, due to the reduction of silica gel wrapping the activated alumina, the proportion of activated alumina failure increases, so the filtration efficiency decay rate of the non-woven fabric increases.

[0180] Combining Example 2 and Comparative Example 6 and referring to Table 4, it can be seen that the addition of the solid electrolyte improves the filtration efficiency of the non-woven fabric and reduces the attenuation rate of the filtration efficiency of the non-woven fabric. The solid electrolyte includes cationic styrene-acrylic emulsion and graphene oxide. Graphene oxide is used in combination with the cationic styrene-acrylic emulsion and the dehumidifying slurry, reducing the attenuation rate of the filtration efficiency of the non-woven fabric.

[0181] Combining Example 2, Example 11 and Example 12, by adjusting the ratio of the cationic styrene-acrylic emulsion to graphene oxide in the solid electrolyte, the non-woven fabric is less likely to have its protective effect weakened due to alcohol adhesion.

[0182] Combining Example 2 and Example 13 and referring to Table 4, it can be seen that the addition of the cationic styrene-acrylic emulsion improves the filtration efficiency of the non-woven fabric and reduces the attenuation rate of the filtration efficiency of the non-woven fabric. The cationic styrene-acrylic emulsion is loaded on graphene oxide, and relying on the spatial structure of graphene oxide, a spatial conductive network structure with cations is formed. This structure is used in combination with the electret masterbatch, so that the number of cations on the non-woven fabric increases, and positive charges shuttle on the spatial conductive network structure, improving the uniformity of charge distribution and the filtration efficiency of the non-woven fabric. After treatment with ethanol solution, graphene oxide expands, and the cationic styrene-acrylic emulsion expands under the drive of graphene oxide, so that the distribution of cations on the non-woven fabric becomes more dispersed, the filtration efficiency of the non-woven fabric is improved, and the probability of cations and charges being captured by water molecules is reduced, and the attenuation rate of the filtration efficiency of the non-woven fabric is reduced.

[0183] Combining Example 2 and Example 14 and referring to Table 4, it can be seen that the addition of graphene oxide improves the filtration efficiency of the non-woven fabric and reduces the attenuation rate of the filtration efficiency of the non-woven fabric. The conductive network structure formed by graphene oxide and the cationic styrene-acrylic emulsion facilitates the dispersion of charges on the non-woven fabric.

[0184] Combining Example 2 and Comparative Example 7 and referring to Table 4, it can be seen that the setting of the dehumidification treatment reduces the filtration efficiency of the non-woven fabric and reduces the attenuation rate of the filtration efficiency of the non-woven fabric. The dehumidification treatment refers to padding the base fabric with the dehumidifying slurry. The dehumidifying slurry is prepared from polypyrrole, 4-cyanobenzoic acid and soybean powder.

[0185] Combining Example 2, Example 15 and Example 16 and referring to Table 4, by adjusting the ratio of polypyrrole, 4-cyanobenzoic acid and soybean powder in the impregnating slurry, the non-woven fabric is less likely to have its protective effect weakened due to alcohol adhesion.

[0186] Combined with Example 2 and Example 17 and in conjunction with Table 4, it can be seen that the addition of 4-cyanobenzoic acid reduces the attenuation rate of the non-woven fabric filtration efficiency. 4-Cyanobenzoic acid forms a hydrogen bond with the polypropylene molecules, improving the hydrophobicity of the polypropylene molecules, thereby enhancing the hydrophobicity of the base fabric. Water molecules are not easily introduced into the non-woven fabric, thus reducing the adverse effect of water molecules on the charges inside the non-woven fabric, and the filtration attenuation rate of the non-woven fabric decreases.

[0187] Combined with Example 2 and Example 18 and in conjunction with Table 4, it can be seen that the addition of soybean powder reduces the attenuation rate of the non-woven fabric filtration efficiency. The soy protein in the soybean powder absorbs and retains water, and the soybean powder and 4-cyanobenzoic acid form a water molecule movement channel on the surface of the base fabric. The water molecules move towards the soy protein direction, reducing the contact between the water molecules and the charges on the polypropylene molecules, thereby reducing the attenuation rate of the non-woven fabric filtration efficiency.

[0188] Combined with Example 15 and Example 19 and in conjunction with Table 4, it can be seen that as the ratio of polypyrrole to 4-cyanobenzoic acid increases, the filtration efficiency attenuation rate of the non-woven fabric decreases.

[0189] This specific embodiment is only an interpretation of the present application and does not limit the present application. After reading this specification, those skilled in the art can make modifications to this embodiment without creative contributions as needed, but as long as it is within the scope of the claims of the present application, it is protected by the patent law.

Claims

1. An alcohol-resistant meltblown non-woven fabric, characterized in that, it comprises a base fabric, and the base fabric comprises the following raw materials in parts by weight: 100-140 parts of polypropylene particles; 2.5-3.5 parts of electret masterbatch; 9-12 parts of alcohol-resistant masterbatch; 0.9-1.3 parts of charge-stabilizing agent; 1.2-1.6 parts of polyvinylidene fluoride; the alcohol-resistant masterbatch comprises a three-resistant finishing agent, silica gel particles and a desiccant, and the weight ratio of the three-resistant finishing agent, silica gel particles and desiccant is (6-8):2:(1-2); the desiccant is activated alumina; the charge-stabilizing agent comprises a polymer and graphene oxide, and the weight ratio of the polymer and graphene oxide is (14-15):12; the polymer is cationic styrene-acrylic emulsion; the preparation of the alcohol-resistant masterbatch comprises the following steps: S1. Mix the silica gel particles and the activated alumina evenly to obtain a mixture; S2. Add the three-resistant finishing agent to the mixture, stir evenly, bake at 80 °C for 3 min, and then cure at 100 °C to obtain alcohol-resistant particles; S3. After cooling the alcohol-resistant particles, perform plasma treatment in an atmospheric pressure plasma processor, and after the treatment is completed, granulate and screen to obtain an alcohol-resistant masterbatch with a particle size of 1.5 mm; The alcohol-resistant meltblown non-woven fabric is obtained by impregnating and rolling the base fabric with a dehumidifying slurry.

2. An alcohol-resistant meltblown non-woven fabric according to claim 1, characterized in that, the dehumidifying slurry is prepared from 4-cyanobenzoic acid and soybean powder, and the weight ratio of 4-cyanobenzoic acid and soybean powder is 3:

2.

3. An alcohol-resistant meltblown non-woven fabric according to claim 1, characterized in that, the dehumidifying slurry is prepared from polypyrrole, 4-cyanobenzoic acid and soybean powder, and the weight ratio of polypyrrole, 4-cyanobenzoic acid and soybean powder is (10-11):(3-4):

2.

4. A preparation method of the alcohol-resistant meltblown non-woven fabric according to claim 1 or 2, characterized in that, it comprises the following steps: S1. Melting and extrusion; S2. Spinning, hot air drawing and web laying; S3. Impregnating and rolling the base fabric with the dehumidifying slurry, and drying to obtain the alcohol-resistant non-woven fabric; S4. Electrostatic electret and standing, using the corona electret method to electret the alcohol-resistant non-woven fabric, and standing the product after the electret treatment to obtain the alcohol-resistant meltblown non-woven fabric.

5. A preparation method of the alcohol-resistant meltblown non-woven fabric according to claim 3, characterized in that, it comprises the following steps: S1. Melting and extrusion; S2. Spinning, hot air drawing and web laying; S3. Impregnating and rolling the base fabric with the dehumidifying slurry, and drying to obtain the alcohol-resistant non-woven fabric; S4. Electrostatic electret and standing, using the corona electret method to electret the alcohol-resistant non-woven fabric, and standing the product after the electret treatment to obtain the alcohol-resistant meltblown non-woven fabric.

6. A preparation method of the alcohol-resistant meltblown non-woven fabric according to claim 5, characterized in that, S3 comprises the following steps: S31. Ultrasonically stir 4-cyanobenzoic acid, soybean powder and polypyrrole evenly as a pre-impregnation solution; S32. Impregnate and roll the base fabric with the pre-impregnation solution; S33. Wash the base fabric with deionized water and ethanol; S34. Dry the base fabric to obtain the alcohol-resistant meltblown non-woven fabric.

Images