A non-woven fabric with high tear resistance and preparation method thereof

Abstract

The present invention belongs to the technical field of non-woven fabric manufacturing, and specifically relates to a non-woven fabric with high tear resistance and a preparation method. The non-woven fabric with high tear resistance provided by the present invention includes the following components and their weight proportions: 50-70 parts of fiber raw materials, 14-23 parts of fillers, 3-7 parts of flow aids, 20-25 parts of additives, and 8-15 parts of polyurethane. The non-woven fabric with high tear resistance provided by the present invention improves the formula of traditional non-woven fabrics, and the fiber raw materials, fillers and additives in the formula play a synergistic role, which effectively improves the tear resistance of the non-woven fabric; modified chitosan is added to the formula, which effectively improves the antibacterial properties of the non-woven fabric. In addition, the non-woven fabric with high tear resistance provided by the present invention has a simple formula, and the preparation method is easy to operate, which effectively saves the production cost of the non-woven fabric, and is conducive to industrial production.

Description

Technical Field

[0001] The present invention belongs to the technical field of non-woven fabric manufacturing, and in particular relates to a non-woven fabric with high tear resistance and a preparation method thereof. Background Art

[0002] Non-woven fabric, also known as non-woven fabric, is a sheet, web or pad made of directional or randomly arranged fibers that are combined with each other through a combination of friction, adhesion or bonding. It has the characteristics of moisture-proof, breathable, flexible, lightweight, non-combustible, easy to decompose, non-toxic and non-irritating, and low price. It is widely used in many fields such as medical care, clothing, and packaging materials.

[0003] Existing nonwoven fabrics lack the inherent strength and durability of woven fabrics. They also suffer from poor tear resistance, tensile strength, and abrasion resistance, making them susceptible to tearing and excessive wear, which can damage them and make them unsuitable for applications requiring high strength. Furthermore, using pure specialty fibers (or filaments, long fibers) to make nonwovens is expensive and cannot meet market demand. Therefore, there is an urgent need to develop low-cost, high-performance nonwoven fabrics with excellent mechanical properties.

[0004] Patent publication number CN108893973A discloses a tear-resistant medical nonwoven fabric. Its raw materials include polyurethane fibers, modified cerium titanate, polyethylene glycol wax, an antibacterial agent, an antistatic agent, and an antioxidant. The modified cerium titanate is prepared using the following process: mesoporous cerium titanate, nanoglass fibers, and a coupling agent are added to an acetone solution. After adjusting the pH, polymethyl methacrylate and polyvinyl alcohol are added. The modified cerium titanate is then subjected to constant temperature ultrasonic treatment and drying. This medical nonwoven fabric exhibits excellent antibacterial and antistatic properties, but its tear resistance still needs to be improved.

[0005] Patent publication number CN111270342A discloses a high-strength, tear-resistant nonwoven fabric for packaging production and its preparation method. The fabric is made from high-strength composite fibers through a hydroentanglement or needle-punching process. The high-strength composite fibers are made from the following raw materials in parts by weight: 30-37 parts of polybutylene adipamide, 45-55 parts of polyhexamethylene adipamide, 15-20 parts of polytetraphenylene terephthalamide, 10-14 parts of poly(p-phenylene terephthalamide), 3.5-5 parts of carboxylated carbon nanotubes, 2.5-3.5 parts of graphene oxide, 1.5-2.2 parts of cerium oxide, 3-5 parts of nanofiller, and 5-10 parts of a flow aid. The high-strength, tear-resistant nonwoven fabric for bag production of the present invention has high bursting strength and breaking strength, significantly superior to ordinary nylon nonwoven fabrics at the same thickness, and exhibits high strength, high tear resistance, and excellent mechanical properties. However, the raw material composition of this non-woven fabric is complex and the production cost is high, which is not conducive to industrial production.

[0006] In summary, the existing technology generally has technical problems such as poor tear resistance, poor antibacterial performance, low strength, and high cost. Summary of the Invention

[0007] To overcome the shortcomings of the prior art, the present invention aims to provide a nonwoven fabric with high tear resistance and a method for preparing the same. The nonwoven fabric with high tear resistance provided by the present invention effectively improves the tear resistance and antibacterial properties of the nonwoven fabric, and the raw materials used in its preparation are simple, effectively reducing production costs.

[0008] In order to achieve the above object, the technical solution of the present invention is as follows:

[0009] A non-woven fabric with high tear resistance comprises the following components and their weight proportions: 50-70 parts of fiber raw material, 14-23 parts of filler, 3-7 parts of flow aid, 20-25 parts of additive, and 8-15 parts of polyurethane.

[0010] Furthermore, the fiber raw materials in the high tear resistance non-woven fabric are composed of polypropylene particles, hydroxypropyl starch ether, modified chitosan, and polyethylene terephthalate in a mass ratio of 32-36:13-15:4-7:19-24.

[0011] Furthermore, the preparation method of the modified chitosan in the fiber raw material is as follows: add 50 mL of paraffin and water to a 250 mL three-necked flask equipped with a stirrer, then add 2 mL of acetic acid and 0.83 g of soybean lecithin, and emulsify at 30°C for 30 minutes; add 1 g of chitosan and stir for 30 minutes, then add 5 mL of methanol and heat to 60°C, react for 1 hour, adjust the pH value to 10 with 1 mol / L sodium hydroxide, and then add 10 mL of glutaraldehyde and react for 2 hours; after the reaction is completed, transfer the reactant in the three-necked flask to a 250 mL beaker, cool it completely and filter it, wash the filter residue with petroleum ether 3 times, then wash it with acetone 3 times, and vacuum dry it to obtain a crude product; place the crude product in a Soxhlet extractor, reflux extract it with ethanol-glacial acetic acid with a volume ratio of 40:60 for 10 hours, and vacuum dry it to obtain it.

[0012] Furthermore, the filler in the high tear resistance non-woven fabric is composed of graphene oxide and nano-calcium carbonate in a mass ratio of 23-27:12-16.

[0013] Furthermore, the flow aid in the high tear resistance non-woven fabric is nano silicon dioxide.

[0014] Furthermore, the additive in the high tear resistance non-woven fabric consists of epoxy resin and dibutyl phthalate in a mass ratio of 10-14:7-9.

[0015] The present invention also provides a method for preparing the non-woven fabric with high tear resistance, comprising the following steps:

[0016] S1. Co-melting: Weigh the fiber raw materials in the formula amount, add them into a crusher for crushing, and sieve them. Then add fillers, flow aids, additives and polyurethane. After stirring evenly, put them into a twin-screw extruder and heat them for 30-50 minutes to obtain a melt.

[0017] S2, spinning: the melt obtained in step S1 is placed into a composite spinning machine, ejected from a spinneret to form filaments, which are then cooled by air blowing to obtain high-strength composite fibers;

[0018] S3, laying the web: pressing the high-strength composite fiber obtained in step S2 with a hot pressing roller to obtain a fiber web;

[0019] S4, consolidation: the fiber web obtained in step S3 is fixed and formed under the conditions of a temperature of 120-135° C. and a pressure of 12-13 MPa.

[0020] Furthermore, in the preparation method of the non-woven fabric with high tear resistance, the fabric is sieved through a 500-600 mesh sieve in step S1; the heating temperature of the extruder is 350-400° C., and the screw speed is 80-100 rpm.

[0021] Furthermore, in step S2 of the method for preparing the non-woven fabric with high tear resistance, the pressure of the spinneret is 7-9 MPa.

[0022] Furthermore, in step S3 of the method for preparing the non-woven fabric with high tear resistance, the temperature of the hot pressing roller is 80-85°C.

[0023] The fiber raw materials in the high-tear-resistant non-woven fabric provided by the present invention are composed of polypropylene particles, hydroxypropyl starch ether, modified chitosan, and polyethylene terephthalate. The polypropylene particles, hydroxypropyl starch ether, and polyethylene terephthalate together form a high-strength composite fiber, which fully utilizes their respective advantages and promotes each other. The addition of modified chitosan forms a three-dimensional network structure within the composite fiber, thereby further improving the mechanical properties of the composite fiber and thus improving the tear resistance of the non-woven fabric. At the same time, the addition of modified chitosan can also effectively improve the antibacterial properties of the non-woven fabric.

[0024] The present invention employs a filler component composed of graphene oxide and nano-calcium carbonate, which is added to a molten fiber raw material for spinning. This not only increases the density of the silk fibers, but also effectively improves the hardness and tensile strength of the silk fibers, thereby effectively enhancing the tear resistance of the nonwoven fabric. However, during research, the applicant discovered that excessive amounts of filler reduced the tensile strength of the nonwoven fabric, while too low an amount failed to increase the fiber density. The nonwoven fabric exhibited optimal tear resistance when the filler content was 14-23 parts.

[0025] The epoxy resin in the present invention's high-tear-resistant nonwoven fabric additive effectively bonds and spins during the web laying process, thereby increasing the density of the nonwoven fabric and improving its tensile strength and tear resistance. Dibutyl phthalate improves the toughness, softness, and elasticity of the epoxy resin, increasing its impact strength and peel strength. Research by the present invention has found that the nonwoven fabric exhibits optimal tear resistance when the epoxy resin and dibutyl phthalate are combined in a mass ratio of 10-14:7-9.

[0026] In the preparation method of the non-woven fabric with high tear resistance provided by the present invention, a relatively high heating temperature is adopted to melt the fiber raw material, which is conducive to the formation of stable crystals of the fiber raw material, thereby improving the mechanical properties of the composite fiber.

[0027] Compared with the prior art, the high tear resistance nonwoven fabric provided by the present invention and its preparation method and application have the following technical advantages:

[0028] (1) The high tear resistance non-woven fabric provided by the present invention improves the formula of traditional non-woven fabrics. The fiber raw materials, fillers and additives in the formula have a synergistic effect as previously described, effectively improving the tear resistance of the non-woven fabric;

[0029] (2) The non-woven fabric with high tear resistance provided by the present invention has modified chitosan added to its formula, which effectively improves the antibacterial properties of the non-woven fabric;

[0030] (3) The high tear resistance non-woven fabric provided by the present invention has a simple formula and an easy-to-operate preparation method, which effectively saves the production cost of the non-woven fabric and is conducive to industrial production. DETAILED DESCRIPTION

[0031] The present invention is further described below by specific embodiments, but the present invention is not limited to the following embodiments. Those skilled in the art can make various modifications based on the basic idea of ​​the present invention, but as long as they do not depart from the basic idea of ​​the present invention, they are all within the scope of the present invention.

[0032] The preparation method of the modified chitosan in the fiber raw material in this specific embodiment is as follows: 50 mL of paraffin wax and 50 mL of water are added to a 250 mL three-necked flask equipped with a stirrer, and then 2 mL of acetic acid and 0.83 g of soybean lecithin are added, and the mixture is emulsified at 30° C. for 30 minutes; 1 g of chitosan is added, stirred for 30 minutes, 5 mL of methanol is added, and the temperature is raised to 60° C., and the reaction is carried out for 1 hour. The pH value is adjusted to 10 with 1 mol / L sodium hydroxide, and 10 mL of glutaraldehyde is added and reacted for 2 hours. After the reaction is completed, the reactant in the three-necked flask is transferred to a 250 mL beaker, completely cooled, and then filtered. The filter residue is first washed with petroleum ether 3 times, then washed with acetone 3 times, and vacuum dried to obtain a crude product; the crude product is placed in a Soxhlet extractor, refluxed and extracted with ethanol-glacial acetic acid in a volume ratio of 40:60 for 10 hours, and vacuum dried to obtain the product.

[0033] Example 1: A non-woven fabric with high tear resistance and its preparation method

[0034] A non-woven fabric with high tear resistance comprises the following components and their weight proportions: 50 parts of fiber raw material, 23 parts of filler, 7 parts of nano-silicon dioxide, 25 parts of additives and 15 parts of polyurethane.

[0035] The fiber raw materials in the high-tear-resistant non-woven fabric are composed of polypropylene particles, hydroxypropyl starch ether, modified chitosan, and polyethylene terephthalate in a mass ratio of 32:13:4:19; the filler in the high-tear-resistant non-woven fabric is composed of graphene oxide and nano-calcium carbonate in a mass ratio of 23:12; and the additives in the high-tear-resistant non-woven fabric are composed of epoxy resin and dibutyl phthalate in a mass ratio of 10:7.

[0036] The present invention also provides a method for preparing the non-woven fabric with high tear resistance, comprising the following steps:

[0037] S1. Co-melting: Weigh the formulated amount of fiber raw materials, add them to a crusher for crushing, and pass them through a 500-mesh sieve. Then, add fillers, flow aids, additives, and polyurethane. After stirring evenly, put them into a twin-screw extruder and heat them for 30 minutes at a heating temperature of 400°C and a screw speed of 80 rpm to obtain a melt.

[0038] S2, spinning: the melt obtained in step S1 is placed in a composite spinning machine, ejected from a spinneret at a pressure of 7 MPa to form filaments, which are then cooled by air blowing to obtain high-strength composite fibers;

[0039] S3, laying the web: pressing the high-strength composite fiber obtained in step S2 with a hot pressing roller at 80°C to obtain a fiber web;

[0040] S4, consolidation: the fiber web obtained in step S3 is fixed and formed under the conditions of a temperature of 120° C. and a pressure of 13 MPa.

[0041] Example 2: A non-woven fabric with high tear resistance and its preparation method

[0042] A non-woven fabric with high tear resistance comprises the following components and their weight proportions: 70 parts of fiber raw material, 23 parts of filler, 7 parts of nano-silicon dioxide, 25 parts of additives, and 15 parts of polyurethane.

[0043] The fiber raw materials in the high-tear-resistant non-woven fabric are composed of polypropylene particles, hydroxypropyl starch ether, modified chitosan, and polyethylene terephthalate in a mass ratio of 36:15:7:24; the filler in the high-tear-resistant non-woven fabric is composed of graphene oxide and nano-calcium carbonate in a mass ratio of 27:16; and the additives in the high-tear-resistant non-woven fabric are composed of epoxy resin and dibutyl phthalate in a mass ratio of 14:9.

[0044] The present invention also provides a method for preparing the non-woven fabric with high tear resistance, comprising the following steps:

[0045] S1. Co-melting: Weigh the formulated amount of fiber raw materials, add them to a crusher for crushing, and pass them through a 600-mesh sieve. Then, add fillers, flow aids, additives, and polyurethane. After stirring evenly, put them into a twin-screw extruder and heat them for 50 minutes at a heating temperature of 350°C and a screw speed of 100 rpm to obtain a melt.

[0046] S2, spinning: the melt obtained in step S1 is placed in a composite spinning machine, ejected from a spinneret at a pressure of 9 MPa to form filaments, which are then cooled by air blowing to obtain high-strength composite fibers;

[0047] S3, laying the web: pressing the high-strength composite fiber obtained in step S2 with a hot pressing roller at 85°C to obtain a fiber web;

[0048] S4, consolidation: the fiber web obtained in step S3 is fixed and formed under the conditions of a temperature of 135° C. and a pressure of 12 MPa.

[0049] Example 3: A non-woven fabric with high tear resistance and its preparation method

[0050] A non-woven fabric with high tear resistance comprises the following components and their weight proportions: 61 parts of fiber raw material, 19 parts of filler, 5 parts of nano-silicon dioxide, 23 parts of additives, and 11 parts of polyurethane.

[0051] The fiber raw materials in the high-tear-resistant non-woven fabric are composed of polypropylene particles, hydroxypropyl starch ether, modified chitosan, and polyethylene terephthalate in a mass ratio of 34:14:5:21; the filler in the high-tear-resistant non-woven fabric is composed of graphene oxide and nano-calcium carbonate in a mass ratio of 26:15; and the additives in the high-tear-resistant non-woven fabric are composed of epoxy resin and dibutyl phthalate in a mass ratio of 13:8.

[0052] The present invention also provides a method for preparing the non-woven fabric with high tear resistance, comprising the following steps:

[0053] S1. Co-melting: Weigh the formulated amount of fiber raw materials, add them into a crusher for crushing, and pass them through a 550-mesh sieve. Then, add fillers, flow aids, additives, and polyurethane. After stirring evenly, put them into a twin-screw extruder and heat them for 40 minutes at a heating temperature of 380°C and a screw speed of 90 rpm to obtain a melt.

[0054] S2, spinning: the melt obtained in step S1 is placed in a composite spinning machine, ejected from a spinneret at a pressure of 8 MPa to form filaments, which are then cooled by air blowing to obtain high-strength composite fibers;

[0055] S3, laying the web: pressing the high-strength composite fiber obtained in step S2 with a hot pressing roller at 83°C to obtain a fiber web;

[0056] S4, consolidation: the fiber web obtained in step S3 is fixed and formed under the conditions of a temperature of 131° C. and a pressure of 12 MPa.

[0057] Comparative Example 1: A non-woven fabric and its preparation method

[0058] The formulation and preparation method of the non-woven fabric in this comparative example are similar to those in Example 3.

[0059] The difference between this comparative example and Example 3 is that the fiber raw material in this comparative example consists of polypropylene particles, hydroxypropyl starch ether, and polyethylene terephthalate in a mass ratio of 34:14:21, and no modified chitosan is added in this comparative example.

[0060] Comparative Example 2: Non-woven fabric and preparation method thereof

[0061] The formulation and preparation method of the non-woven fabric in this comparative example are similar to those in Example 3.

[0062] The difference between this comparative example and Example 3 is that the fiber raw material in this comparative example consists of polypropylene particles, hydroxypropyl starch ether, bis-chitosan, and polyethylene terephthalate in a mass ratio of 34:14:5:21, and bis-chitosan is used instead of modified chitosan.

[0063] Comparative Example 3: A non-woven fabric and its preparation method

[0064] The formulation and preparation method of the non-woven fabric in this comparative example are similar to those in Example 3.

[0065] The difference between this comparative example and Example 3 is that the amount of the filler used in this comparative example is 5 parts.

[0066] Comparative Example 4: Non-woven fabric and preparation method thereof

[0067] The formulation and preparation method of the non-woven fabric in this comparative example are similar to those in Example 3.

[0068] The difference between this comparative example and Example 3 is that the amount of the filler used in this comparative example is 35 parts.

[0069] Comparative Example 5: A non-woven fabric and its preparation method

[0070] The formulation and preparation method of the non-woven fabric in this comparative example are similar to those in Example 3.

[0071] The difference between this comparative example and Example 3 is that the filler in this comparative example is composed of white carbon black and calcium carbonate in a mass ratio of 26:15, that is, white carbon black and calcium carbonate are used instead of graphene oxide and nano-calcium carbonate, respectively.

[0072] Comparative Example 6: Non-woven fabric and preparation method thereof

[0073] The formulation and preparation method of the non-woven fabric in this comparative example are similar to those in Example 3.

[0074] The difference between this comparative example and Example 3 is that the additive in this comparative example consists of epoxy resin and dibutyl phthalate in a mass ratio of 1:1.

[0075] Comparative Example 7: Non-woven fabric and preparation method thereof

[0076] The formulation and preparation method of the non-woven fabric in this comparative example are similar to those in Example 3.

[0077] The difference between this comparative example and Example 3 is that the heating temperature in step S1 of the method for preparing the non-woven fabric in this comparative example is 210°C.

[0078] Test Example 1: Tear Resistance Test

[0079] Test samples: non-woven fabrics prepared in Examples 1-3 and Comparative Examples 1-7;

[0080] Test Method: Referring to GB / T 3917.2-2009, "Tear Properties of Textile Fabrics - Part 2: Determination of Tear Strength of Trouser-Shaped Specimens (Single Seam)," the tear resistance of the tear-resistant, antibacterial nonwoven fabrics obtained from various examples of the present invention was tested. The tensile speed was 100 mm / min; the gauge length could be set to 100 mm; the effective clamp width was 75 mm. The tear-resistant, antibacterial nonwoven fabrics obtained from various examples of the present invention were formed into strips of 200 mm in length and 50 mm in width. Each specimen was cut with a 100 mm long slit parallel to the length, running down the middle of the width. The tear endpoint was marked at the center of the specimen, 25 mm from the uncut end. Five different specimens were tested in each example, and the test results were averaged over the five specimens.

[0081] Test results: The test results are shown in Table 1.

[0082] Table 1 Tear resistance test results

[0083] Group Tearing strength (N) Example 1 91.0 Example 2 90.3 Example 3 91.2 Comparative Example 1 86.7 Comparative Example 2 87.1 Comparative Example 3 71.6 Comparative Example 4 74.9 Comparative Example 5 81.2 Comparative Example 6 84.7 Comparative Example 7 85.4

[0084] As can be seen from Table 1, the high tear resistance non-woven fabric provided by the present invention has a ground strength of up to 90.3-91.2N and excellent tear resistance. Among them, the non-woven fabric prepared in Example 3 has the highest tear strength and is the best embodiment of the present invention.

[0085] Compared with Example 3, no modified chitosan was added in Comparative Example 1, and bis-chitosan was used instead of modified chitosan in Comparative Example 2, but the tear strength of the obtained non-woven fabric was reduced, which shows that the modified chitosan added in the formula of the present invention can form a three-dimensional network structure inside the composite fiber, improve the mechanical properties of the fiber, and thus improve the tear resistance of the non-woven fabric.

[0086] In Comparative Example 3, the filler dosage was reduced, while in Comparative Example 4, the filler dosage was increased. However, the tear strength of the resulting nonwoven fabric decreased. This indicates that the filler dosage in the nonwoven fabric formulation provided by the present invention has reached the optimal range. Reducing the filler dosage does not increase the fiber density, while increasing the filler dosage reduces the tensile strength of the nonwoven fabric, thereby reducing the tear strength of the nonwoven fabric. In Comparative Example 5, white carbon black and calcium carbonate were used instead of graphene oxide and nano-calcium carbonate, but the tear strength of the resulting nonwoven fabric decreased. This indicates that not all fillers can achieve the technical effects of graphene oxide and nano-calcium carbonate in the present invention.

[0087] In Comparative Example 6, the dosage ratio of the additives epoxy resin and dibutyl phthalate was changed, but the tear strength of the obtained non-woven fabric was reduced, which shows that the dosage ratio of the additives in the formula of the high tear resistance non-woven fabric provided by the present invention has been optimized.

[0088] In the preparation method of the non-woven fabric in Comparative Example 7, low-temperature heating is used in step S1, but the tear strength of the non-woven fabric obtained is reduced. This shows that the use of high-temperature heating in the preparation method of the non-woven fabric provided by the present invention is conducive to the formation of stable crystals of the fiber raw material, thereby improving the tear resistance of the non-woven fabric.

[0089] Test Example 2: Antibacterial Performance Test

[0090] Test samples: non-woven fabrics prepared in Examples 1-3 and Comparative Examples 1-2;

[0091] Test method: Refer to GB / T 20944.1-2007 for testing. The test bacteria are Escherichia coli (ATCC11229) and Staphylococcus aureus (ATCC6538). Circular nonwoven fabric samples with a diameter of 25 mm are incubated at a temperature of 37°C and a relative humidity of 85% for 24 hours to determine the width of the inhibition zone.

[0092] Test results: The test results are shown in Table 2.

[0093] Table 2 Antibacterial performance test results

[0094] Group Width of E. coli inhibition zone (mm) Width of the Staphylococcus aureus inhibition zone (mm) Example 1 5.01 4.93 Example 2 4.99 4.91 Example 3 5.04 4.97 Comparative Example 1 3.82 3.77 Comparative Example 2 3.91 3.94

[0095] As can be seen from Table 2, the high tear resistance non-woven fabric provided by the present invention has a wide inhibition zone width against Escherichia coli and Staphylococcus aureus, indicating that the high tear resistance non-woven fabric provided by the present invention has a good antibacterial effect.

[0096] Compared with Example 3, no modified chitosan was added in Comparative Example 1, and bis-chitosan was used instead of modified chitosan in Comparative Example 2. However, the width of the inhibition zone of the prepared non-woven fabric against Escherichia coli and Staphylococcus aureus was reduced, which shows that the use of modified chitosan in the present invention can effectively improve the antibacterial properties of the non-woven fabric.

[0097] The above examples are merely illustrative of the preparation methods of the present invention and are not intended to limit the present invention. Anyone skilled in the art is prohibited from modifying the above examples without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or variations made by one of ordinary skill in the art without departing from the technical principles of the present invention are encompassed by the claims of the present invention.

Claims

1. A nonwoven fabric with high tear resistance, characterized in that: The invention comprises the following components and their weight proportions: 50-70 parts of fiber raw materials, 14-23 parts of fillers, 3-7 parts of flow aids, 20-25 parts of additives, and 8-15 parts of polyurethane; the fiber raw materials are composed of polypropylene particles, hydroxypropyl starch ether, modified chitosan, and polyethylene terephthalate in a mass ratio of 32-36:13-15:4-7:19-24; The preparation method of the modified chitosan in the fiber raw material is as follows: add 50 mL of paraffin and water respectively to a 250 mL three-necked flask equipped with a stirrer, then add 2 mL of acetic acid and 0.83 g of soybean lecithin, and emulsify at 30° C. for 30 min; add 1 g of chitosan and stir for 30 min, then add 5 mL of methanol and heat to 60° C., react for 1 h, adjust the pH value to 10 with 1 mol / L of sodium hydroxide, then add 10 mL of glutaraldehyde and react for 2 h; after the reaction is completed, transfer the reactant in the three-necked flask to a 250 mL beaker, completely cool and then filter, wash the filter residue with petroleum ether for 3 times, then wash with acetone for 3 times, and vacuum dry to obtain a crude product; place the crude product in a Soxhlet extractor, reflux extract with ethanol-glacial acetic acid with a volume ratio of 40:60 for 10 h, and vacuum dry to obtain; The filler is composed of graphene oxide and nano calcium carbonate in a mass ratio of 23-27:12-16.

2. The high tear resistance nonwoven fabric according to claim 1, characterized in that: The flow aid is nano silicon dioxide.

3. The high tear resistance nonwoven fabric according to claim 1, characterized in that: The additive is composed of epoxy resin and dibutyl phthalate in a mass ratio of 10-14:7-9.

4. The method for preparing a nonwoven fabric with high tear resistance according to any one of claims 1 to 3, characterized in that: The following steps are involved: S1. Co-melting: Weigh the fiber raw materials in the formula amount, add them into a crusher for crushing, and sieve them, then add fillers, flow aids, additives and polyurethane, stir them evenly, and then put them into a twin-screw extruder for heating treatment for 30-50 minutes to obtain a melt; S2, spinning: putting the molten mass obtained in step S1 into a composite spinning machine, spraying it out from a spinneret to form filaments, and then cooling it by air blowing to obtain high-strength composite fibers; S3, laying a web: pressing the high-strength composite fiber obtained in step S2 by means of a hot pressing roller to obtain a fiber web; S4, consolidation: the fiber web obtained in step S3 is fixed and formed under the conditions of a temperature of 120-135° C. and a pressure of 12-13 MPa.

5. The method for preparing a nonwoven fabric with high tear resistance according to claim 4, characterized in that: In the step S1, the sieve is 500-600 mesh; the heating temperature of the extruder is 350-400° C., and the screw speed is 80-100 rpm.

6. The method for preparing a nonwoven fabric with high tear resistance according to claim 4, characterized in that: The pressure of the spinneret in step S2 is 7-9 MPa.

7. The method for preparing a nonwoven fabric with high tear resistance according to claim 4, characterized in that: The temperature of the hot pressing roller in step S3 is 80-85°C.