Non-woven fabric with strong tear resistance and preparation method thereof

Abstract

The invention discloses a non-woven fabric with strong tear resistance and a preparation method thereof, and relates to the technical field of non-woven fabrics, and the non-woven fabric with strong tear resistance is prepared from the following components in parts by weight: 40-70 parts of polypropylene, 30-45 parts of polyethylene glycol terephthalate, 6-15 parts of nano silicon dioxide, 10-25 parts of modified phenolic fiber, 10-16 parts of epoxy resin, 10-16 parts of dibutyl phthalate and 6-9 parts of polyurethane. The high-tear-resistance non-woven fabric has excellent tear resistance and dimensional stability, and also has good flexibility and elasticity recovery capability, so that the high-tear-resistance non-woven fabric can keep a complete structure in various complex environments, and the unique mildew-proof, antibacterial and anti-ultraviolet aging characteristics of the high-tear-resistance non-woven fabric remarkably prolong the service life of the material and greatly expand the application range.

Description

Technical Field

[0001] The present invention relates to the technical field of non-woven fabrics, and in particular to a highly tear-resistant non-woven fabric and a preparation method thereof. Background Art

[0002] Nonwoven fabrics are fabrics that don't require spinning or weaving. They are made from oriented or randomly arranged fibers bonded together through friction, bonding, or heat pressing. As an important industrial material, nonwovens offer advantages such as light weight, excellent breathability, and low cost. They are widely used in healthcare, filtration materials, agriculture, construction, automotive interiors, and protective equipment.

[0003] With the development of industrial technology and the expansion of its application areas, the market's performance requirements for non-woven materials are constantly increasing. In particular, in high-strength, high-reliability applications, traditional non-woven fabrics have significant shortcomings, primarily manifested in low tear strength, short service life, and single functionality. While the polypropylene (PP) and polyester (PET) non-woven fabrics currently common on the market possess a certain level of strength, they are prone to tearing damage when subjected to repeated stretching and puncture by sharp objects. Furthermore, their performance degrades rapidly in harsh environments such as humidity, high temperature, and ultraviolet radiation, severely limiting their application in specialized environments.

[0004] Existing methods for improving the tear resistance of nonwoven fabrics primarily include increasing material density, changing fiber arrangement, and adding reinforcing fibers. However, these methods often result in increased rigidity, decreased flexibility, or significantly increased processing difficulty and cost. Furthermore, most improvement proposals focus solely on improving mechanical properties, ignoring functional requirements such as mildew resistance, antibacterial properties, and aging resistance in practical applications, failing to meet comprehensive application requirements.

[0005] 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 dried.

[0006] In recent years, although some studies have attempted to introduce functional fibers and additives into the non-woven fabric preparation process, these technologies often have problems such as poor component compatibility and insufficient functional durability, making it difficult to achieve effective synergy between mechanical properties and functional characteristics.

[0007] Therefore, the development of a new type of non-woven fabric material with excellent tear resistance, long-lasting functionality and good processing performance has important theoretical significance and practical value for improving the competitiveness of non-woven fabric products and expanding their application areas. Summary of the Invention

[0008] In order to address the deficiencies in the prior art, the purpose of the present invention is to provide a highly tear-resistant non-woven fabric and a preparation method thereof. The highly tear-resistant non-woven fabric has excellent tear resistance and dimensional stability, as well as good flexibility and elastic recovery ability, so that it can maintain structural integrity in various complex environments. Its unique mildew-proof, antibacterial and UV-resistant aging properties significantly extend the service life of the material and greatly expand its application range.

[0009] In order to achieve the above object, the present invention adopts the following technical solutions:

[0010] A highly tear-resistant non-woven fabric is made from the following components, measured by weight: 40-70 parts of polypropylene, 30-45 parts of polyethylene terephthalate, 6-15 parts of nano-silicon dioxide, 10-25 parts of modified phenolic fiber, 10-16 parts of epoxy resin, 10-16 parts of dibutyl phthalate, and 6-9 parts of polyurethane.

[0011] Preferably, the preparation method of the modified phenolic fiber comprises the following steps:

[0012] (1) placing phenolic fiber in an ethanol aqueous solution, adding KH550, adjusting the pH of the system, refluxing the reaction, filtering, washing, and drying the product to obtain pretreated fiber;

[0013] Silane coupling treatment: KH550 (γ-aminopropyltriethoxysilane) is hydrolyzed under acidic conditions, and the ethoxy group is converted into silanol to form an active intermediate, which condenses with the hydroxyl group on the surface of the phenolic fiber to form a Si-OC bond, linking the amino group to the fiber surface.

[0014] Preferably, in step (1), the phenolic fiber has a diameter of 10 to 50 μm and a length of 0.5 to 4 mm.

[0015] Preferably, in step (1), the usage ratio of phenolic fiber, ethanol aqueous solution and KH550 is 10g:100-150mL:0.5-3g; the volume ratio of ethanol to deionized water in the ethanol aqueous solution is 85-95:5-15.

[0016] Preferably, in step (1), glacial acetic acid is used to adjust the pH of the system to 4-5; and the reflux reaction conditions are 70-85° C. for 2-5 hours.

[0017] (2) Caffeic acid was added to DMF, followed by EDC and NHS, and the pH of the system was adjusted. The mixture was stirred and activated under a nitrogen atmosphere, and then the pretreated fiber was immersed in the mixture, and the temperature was raised to react. The product was filtered, washed, and dried to obtain the grafted fiber.

[0018] Caffeic acid grafting reaction: The carboxyl group of caffeic acid is activated by the EDC / NHS system. The amino group on the surface of the pretreated fiber acts as a nucleophilic reagent and undergoes a nucleophilic substitution reaction with the activated caffeic acid NHS ester to form an amide bond. At the same time, NHS is released, and the caffeic acid structure containing a carbon-carbon double bond and a phenolic hydroxyl group is successfully grafted to the fiber surface, providing reaction sites for subsequent free radical addition reactions.

[0019] Preferably, in step (2), the usage ratio of caffeic acid, DMF, EDC, NHS and pretreated fiber is 0.8-3.2 g:100-150 mL:1.2-2.4 g:0.6-1.2 g:10 g.

[0020] Preferably, in step (2), triethylamine is used to adjust the pH of the system to 7-9; the stirring activation condition is stirring and activating at room temperature for 1-2 hours; and the temperature reaction condition is reacting at 40-55°C for 8-16 hours.

[0021] (3) The grafted fiber is immersed in toluene, and then N-allyl-2-hydroxybenzamide and AIBN are added, and the reaction is stirred under a nitrogen atmosphere. The product is filtered, washed, and dried to obtain modified phenolic fiber.

[0022] Free radical addition reaction: AIBN thermally decomposes to generate free radicals, which attack the carbon-carbon double bond of caffeic acid on the fiber surface, forming carbon radical intermediates. These intermediates then attack the allyl double bond of N-allyl-2-hydroxybenzamide, achieving an addition reaction and covalently attaching the anti-fungal active structure to the fiber surface, thus functionalizing the phenolic fiber.

[0023] Preferably, in step (3), the usage ratio of the grafted fiber, toluene, N-allyl-2-hydroxybenzamide, and AIBN is 10 g: 100-150 mL: 1.2-3.6 g: 0.1-0.4 g.

[0024] Preferably, in step (3), the stirring reaction condition is 70-85° C. for 12-16 hours.

[0025] The present invention also claims protection for a method for preparing the highly tear-resistant non-woven fabric, comprising the following steps: mixing the components and conveying them to a screw extruder for melt extrusion to obtain a molten slurry, filtering and metering the slurry, and then inputting it into a spinning box, spinning it through a spinneret, and then cooling and stretching it with air flow to form filament fibers, the filament fibers are evenly adsorbed onto a conveyor belt to form a fiber web, and then hot-rolled by a hot rolling mill to obtain the highly tear-resistant non-woven fabric.

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

[0027] 1. The present invention provides a highly tear-resistant non-woven fabric. Polypropylene as the main material provides basic strength and durability, while polyethylene terephthalate enhances the tensile strength and dimensional stability of the material, effectively preventing deformation during use. Nano-silica, as an inorganic reinforcing agent, significantly improves the wear resistance and rigidity of the material, while improving thermal stability. Modified phenolic fiber not only enhances the tear resistance of the material, but also gives the non-woven fabric excellent UV resistance and mildew resistance. Epoxy resin increases the degree of cross-linking between components, improving the overall structural strength and chemical corrosion resistance. Dibutyl phthalate, as a plasticizer, effectively improves the processing performance and flexibility of the material, avoiding brittle fracture of the product. Polyurethane provides excellent elastic recovery and impact resistance. The components form a complementary synergistic effect, so that the final product has excellent strength, flexibility and durability while maintaining its lightweight characteristics, and is particularly suitable for application scenarios requiring high strength and high durability.

[0028] 2. The present invention provides a modified phenolic fiber that significantly improves its performance in composite materials through a three-step surface chemical modification. The first step, a KH550 silane coupling treatment, introduces amino functional groups onto the fiber surface, significantly improving the interfacial compatibility and bonding strength between the phenolic fiber and the polymer matrix, resolving the problem of poor bonding between traditional phenolic fibers and polymer matrices. The second step, a caffeic acid grafting reaction, introduces a structure containing phenolic hydroxyl groups and carbon-carbon double bonds onto the fiber surface, not only enhancing the fiber's antioxidant properties but also imparting significant UV resistance. The polyphenol structure within the caffeic acid molecule is a natural UV absorber and free radical scavenger, effectively absorbing and blocking UV radiation to prevent photoaging of the material. Its potent antioxidant activity can also capture free radicals in the environment, slowing material degradation and increasing the product's service life. Furthermore, the introduction of caffeic acid provides active sites for subsequent reactions. The third step, a free radical addition reaction of N-allyl-2-hydroxybenzamide, successfully introduces the anti-mildew 2-hydroxybenzamide structure onto the fiber surface, imparting the fiber with long-lasting mildew and antibacterial properties. The ortho-hydroxyl groups and amide groups in the 2-hydroxybenzamide molecule form a unique molecular structure that can exert a potent antifungal effect by interfering with fungal cell wall synthesis and disrupting its membrane structure. The modified phenolic fiber not only maintains its original high strength and heat resistance, but also exhibits significantly improved interfacial compatibility, antioxidant properties, UV resistance, and mildew resistance. In nonwoven fabrics, it can fully exert the dual role of reinforcement and functionalization, effectively improving the composite material's tear resistance and environmental stability, while also imparting multiple protective properties to the material, greatly expanding its application range. DETAILED DESCRIPTION

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

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

[0031] Polypropylene was purchased from LyondellBasell Polyolefins (Shanghai) Co., Ltd., brand MF650Y;

[0032] Polyethylene terephthalate was fiber-grade polyester chips (PET) purchased from Sinopec Yizheng Chemical Fiber Sales Branch;

[0033] Nano-silica structure Hubei Huifu Nanomaterials Co., Ltd., model: HB-152;

[0034] Epoxy resin structure Suzhou Jiaye Biotechnology Co., Ltd., brand E-44;

[0035] Dibutyl phthalate was purchased from Jinan Wei Te Chemical Technology Co., Ltd., model MY-101;

[0036] Polyurethane was purchased from Shanghai Tuode Industrial Co., Ltd. with the brand names F3250A-F3298A.

[0037] A method for preparing a highly tear-resistant non-woven fabric comprises the following steps:

[0038] (1) 10 g of phenolic fiber was placed in 100-150 mL of ethanol aqueous solution (the volume ratio of ethanol to deionized water was 85-95:5-15), 0.5-3 g of KH550 was added, the pH of the system was adjusted to 4-5 with glacial acetic acid, and the reaction was refluxed at 70-85 ° C for 2-5 h. The product was filtered, washed, and dried to obtain pretreated fiber;

[0039] (2) 0.8-3.2 g of caffeic acid was added to 100-150 mL of DMF, followed by the addition of 1.2-2.4 g of EDC and 0.6-1.2 g of NHS. The pH of the system was adjusted to 7-9 with triethylamine. The mixture was stirred and activated at room temperature under a nitrogen atmosphere for 1-2 h. Subsequently, 10 g of pretreated fiber was immersed in the mixture, and the temperature was raised to 40-55 °C for reaction for 8-16 h. The product was filtered, washed, and dried to obtain a grafted fiber.

[0040] (3) 10 g of the grafted fiber was immersed in 100-150 mL of toluene, and then 1.2-3.6 g of N-allyl-2-hydroxybenzamide and 0.1-0.4 g of AIBN were added, and the mixture was stirred and reacted at 70-85° C. under a nitrogen atmosphere for 12-16 h. The product was filtered, washed, and dried to obtain a modified phenolic fiber;

[0041] (4) 40-70 parts of polypropylene, 30-45 parts of polyethylene terephthalate, 6-15 parts of nano-silica, 10-25 parts of modified phenolic fiber, 10-16 parts of epoxy resin, 10-16 parts of dibutyl phthalate, and 6-9 parts of polyurethane are mixed and transported to a screw extruder for melt extrusion to obtain a molten slurry, which is filtered and measured and then fed into a spinning manifold, spun through a spinneret, and then cooled and stretched by air flow to form filament fibers. The filament fibers are uniformly adsorbed on a conveyor belt to form a fiber web, which is then hot-rolled in a hot rolling mill to obtain the highly tear-resistant non-woven fabric.

[0042] The present invention will be further described below with reference to specific examples.

[0043] Example 1

[0044] A method for preparing a highly tear-resistant non-woven fabric comprises the following steps:

[0045] (1) 10 g of phenolic fiber was placed in 150 mL of ethanol-water solution (the volume ratio of ethanol to deionized water was 90:10), 3 g of KH550 was added, the pH of the system was adjusted to 4.5 with glacial acetic acid, and the reaction was refluxed at 85 °C for 2 h. The product was filtered, washed, and dried to obtain pretreated fiber;

[0046] (2) 3.2 g of caffeic acid was added to 120 mL of DMF, followed by 2.4 g of EDC and 1.2 g of NHS. The pH of the system was adjusted to 8 with triethylamine. The mixture was stirred and activated at room temperature under a nitrogen atmosphere for 1 h. Subsequently, 10 g of pretreated fiber was immersed in the mixture and the temperature was raised to 55 °C for 8 h. The product was filtered, washed, and dried to obtain the grafted fiber.

[0047] (3) 10 g of the grafted fiber was immersed in 120 mL of toluene, and then 3.6 g of N-allyl-2-hydroxybenzamide and 0.4 g of AIBN were added. The mixture was stirred at 85 °C under a nitrogen atmosphere for 12 h. The product was filtered, washed, and dried to obtain modified phenolic fiber.

[0048] (4) 7000 g of polypropylene, 4500 g of polyethylene terephthalate, 1500 g of nano-silica, 2500 g of modified phenolic fiber, 1600 g of epoxy resin, 1600 g of dibutyl phthalate, and 900 g of polyurethane are mixed and conveyed to a screw extruder for melt extrusion to obtain a molten slurry, which is then filtered and metered and fed into a spinning manifold. The slurry is spun through a spinneret and then cooled and stretched by air flow to form filament fibers. The filament fibers are uniformly adsorbed on a conveyor belt to form a fiber web, which is then hot-rolled in a hot rolling mill to obtain the highly tear-resistant non-woven fabric.

[0049] Example 2

[0050] A method for preparing a highly tear-resistant non-woven fabric comprises the following steps:

[0051] (1) 10 g of phenolic fiber was placed in 150 mL of ethanol-water solution (the volume ratio of ethanol to deionized water was 90:10), 2 g of KH550 was added, the pH of the system was adjusted to 4.5 with glacial acetic acid, and the reaction was refluxed at 80 ° C for 3 h. The product was filtered, washed, and dried to obtain pretreated fiber;

[0052] (2) 2.4 g of caffeic acid was added to 120 mL of DMF, followed by 2.0 g of EDC and 1.0 g of NHS. The pH of the system was adjusted to 8 with triethylamine. The mixture was stirred and activated at room temperature under a nitrogen atmosphere for 1.5 h. Subsequently, 10 g of pretreated fiber was immersed in the mixture and the temperature was raised to 50 °C for 10 h. The product was filtered, washed, and dried to obtain a grafted fiber.

[0053] (3) 10 g of the grafted fiber was immersed in 120 mL of toluene, and then 2.8 g of N-allyl-2-hydroxybenzamide and 0.3 g of AIBN were added. The mixture was stirred at 80 °C under a nitrogen atmosphere for 14 h. The product was filtered, washed, and dried to obtain modified phenolic fiber.

[0054] (4) 6000 g of polypropylene, 4000 g of polyethylene terephthalate, 1200 g of nano-silica, 2000 g of modified phenolic fiber, 1400 g of epoxy resin, 1400 g of dibutyl phthalate, and 800 g of polyurethane are mixed and conveyed to a screw extruder for melt extrusion to obtain a molten slurry, which is then filtered and metered and fed into a spinning manifold. The slurry is spun through a spinneret and then cooled and stretched by air flow to form filament fibers. The filament fibers are uniformly adsorbed on a conveyor belt to form a fiber web, which is then hot-rolled in a hot rolling mill to obtain the highly tear-resistant non-woven fabric.

[0055] Example 3

[0056] A method for preparing a highly tear-resistant non-woven fabric comprises the following steps:

[0057] (1) 10 g of phenolic fiber was placed in 150 mL of ethanol aqueous solution (the volume ratio of ethanol to deionized water was 90:10), 1 g of KH550 was added, the pH of the system was adjusted to 4.5 with glacial acetic acid, and the reaction was refluxed at 70-85 ° C for 2-5 h. The product was filtered, washed, and dried to obtain pretreated fiber;

[0058] (2) 1.6 g of caffeic acid was added to 120 mL of DMF, followed by 1.6 g of EDC and 0.8 g of NHS. The pH of the system was adjusted to 8 with triethylamine. The mixture was stirred and activated at room temperature under a nitrogen atmosphere for 1.5 h. Subsequently, 10 g of pretreated fiber was immersed in the mixture and the temperature was raised to 45 °C for 14 h. The product was filtered, washed, and dried to obtain the grafted fiber.

[0059] (3) 10 g of the grafted fiber was immersed in 120 mL of toluene, and then 2.0 g of N-allyl-2-hydroxybenzamide and 0.2 g of AIBN were added. The mixture was stirred at 75 °C under a nitrogen atmosphere for 15 h. The product was filtered, washed, and dried to obtain modified phenolic fiber.

[0060] (4) 5000 g of polypropylene, 3500 g of polyethylene terephthalate, 900 g of nano-silica, 1500 g of modified phenolic fiber, 1200 g of epoxy resin, 1200 g of dibutyl phthalate, and 00 g of polyurethane are mixed and transported to a screw extruder for melt extrusion to obtain a molten slurry, which is then filtered and metered and then fed into a spinning manifold. The slurry is spun through a spinneret and then cooled and stretched by air flow to form filament fibers. The filament fibers are uniformly adsorbed on a conveyor belt to form a fiber web, which is then hot-rolled in a hot rolling mill to obtain the highly tear-resistant non-woven fabric.

[0061] Example 4

[0062] A method for preparing a highly tear-resistant non-woven fabric comprises the following steps:

[0063] (1) 10 g of phenolic fiber was placed in 150 mL of ethanol aqueous solution (the volume ratio of ethanol to deionized water was 90:10), 0.5 g of KH550 was added, the pH of the system was adjusted to 4.5 with glacial acetic acid, and the reaction was refluxed at 70 ° C for 5 h. The product was filtered, washed, and dried to obtain pretreated fiber;

[0064] (2) 0.8 g of caffeic acid was added to 120 mL of DMF, followed by 1.2 g of EDC and 0.6 g of NHS. The pH of the system was adjusted to 8 with triethylamine. The mixture was stirred and activated at room temperature under a nitrogen atmosphere for 1 h. Subsequently, 10 g of pretreated fiber was immersed in the mixture and the temperature was raised to 40 °C for 16 h. The product was filtered, washed, and dried to obtain the grafted fiber.

[0065] (3) 10 g of the grafted fiber was immersed in 120 mL of toluene, and then 1.2 g of N-allyl-2-hydroxybenzamide and 0.1 g of AIBN were added. The mixture was stirred at 70 °C under a nitrogen atmosphere for 16 h. The product was filtered, washed, and dried to obtain modified phenolic fiber.

[0066] (4) 4000 g of polypropylene, 3000 g of polyethylene terephthalate, 600 g of nano-silica, 1000 g of modified phenolic fiber, 1000 g of epoxy resin, 1000 g of dibutyl phthalate, and 600 g of polyurethane are mixed and conveyed to a screw extruder for melt extrusion to obtain a molten slurry, which is then filtered and metered and fed into a spinning manifold. The slurry is spun through a spinneret and then cooled and stretched by air flow to form filament fibers. The filament fibers are uniformly adsorbed on a conveyor belt to form a fiber web, which is then hot-rolled in a hot rolling mill to obtain the highly tear-resistant non-woven fabric.

[0067] Comparative Example 1

[0068] A method for preparing a highly tear-resistant non-woven fabric comprises the following steps:

[0069] (1) 10 g of phenolic fiber was placed in 150 mL of ethanol-water solution (the volume ratio of ethanol to deionized water was 90:10), 3 g of KH550 was added, the pH of the system was adjusted to 4.5 with glacial acetic acid, and the reaction was refluxed at 85 °C for 2 h. The product was filtered, washed, and dried to obtain pretreated fiber;

[0070] (2) 3.2 g of caffeic acid was added to 120 mL of DMF, followed by 2.4 g of EDC and 1.2 g of NHS. The pH of the system was adjusted to 8 with triethylamine. The mixture was stirred and activated at room temperature under a nitrogen atmosphere for 1 h. Subsequently, 10 g of pretreated fiber was immersed in the mixture and the temperature was raised to 55 °C for 8 h. The product was filtered, washed, and dried to obtain the grafted fiber.

[0071] (3) 7000 g of polypropylene, 4500 g of polyethylene terephthalate, 1500 g of nano-silica, 2500 g of grafted fiber, 1600 g of epoxy resin, 1600 g of dibutyl phthalate, and 900 g of polyurethane are mixed and conveyed to a screw extruder for melt extrusion to obtain a molten slurry, which is then filtered and measured and then fed into a spinning manifold. The slurry is spun through a spinneret, and then cooled and stretched by air flow to form filament fibers. The filament fibers are uniformly adsorbed on a conveyor belt to form a fiber web, which is then hot-rolled in a hot rolling mill to obtain the highly tear-resistant non-woven fabric.

[0072] Comparative Example 2

[0073] A method for preparing a highly tear-resistant non-woven fabric comprises the following steps:

[0074] (1) 10 g of phenolic fiber was placed in 150 mL of ethanol-water solution (the volume ratio of ethanol to deionized water was 90:10), 3 g of KH550 was added, the pH of the system was adjusted to 4.5 with glacial acetic acid, and the reaction was refluxed at 85 °C for 2 h. The product was filtered, washed, and dried to obtain pretreated fiber;

[0075] (2) 7000 g of polypropylene, 4500 g of polyethylene terephthalate, 1500 g of nano-silica, 2500 g of pretreated fiber, 1600 g of epoxy resin, 1600 g of dibutyl phthalate, and 900 g of polyurethane are mixed and conveyed to a screw extruder for melt extrusion to obtain a molten slurry, which is then filtered and metered and fed into a spinning manifold. The slurry is spun through a spinneret and then cooled and stretched by air flow to form filament fibers. The filament fibers are uniformly adsorbed on a conveyor belt to form a fiber web, which is then hot-rolled in a hot rolling mill to obtain the highly tear-resistant non-woven fabric.

[0076] The nonwoven fabrics prepared in Examples 1-4 and Comparative Examples 1-2 were tested for performance. Breaking strength and elongation were tested according to GB / T 24218.3-2010, "Textiles - Nonwovens - Test Methods - Part 3: Determination of Breaking Strength and Elongation at Break (Strip Method)." The test specimens were 20 cm × 5 cm in size, with a clamping gauge of 10 cm and a tensile speed of 100 mm / min. Tear strength was tested according to GB / T 3917.2-2009, "Textile Fabrics - Tear Properties - Part 2: Determination of Tear Strength of Trouser-Shaped Specimens (Single Seam)." The gauge length was 10 cm, the effective clamp width was 75 mm, and the tensile speed was 100 mm / min. The specimens were 20 cm × 5 cm in size. Each specimen was cut with a 100 mm length parallel to the longitudinal direction, running through the middle of the width. The tear endpoint was marked 25 mm from the middle of the specimen to the uncut end. Five different specimens were tested in each case, and the average value was taken. Specific data are shown in Table 1.

[0077] Table 1. Test results of mechanical properties of nonwoven fabrics.

[0078] Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 Breaking strength (N) 147.5 145.7 144.8 143.2 143.7 142.1 Elongation at break (%) 21.3 20.7 20.4 19.8 20.1 19.5 Tear strength (N) 87.2 86.5 85.8 84.7 85.1 84.6

[0079] UV resistance was tested according to GB / T 18830-2009, "Textiles — Evaluation of Ultraviolet Protection," and mildew resistance was tested according to GB / T 24346-2009, "Evaluation of Mildew Resistance of Textiles." Non-woven fabrics were repeatedly washed 50 times with a commercially available detergent (2 hours of soaking, 30 minutes of washing, and 3 hours of drying under a fluorescent lamp). UV resistance and mildew resistance were then tested again. See Table 2 for specific data.

[0080] Table 2 Test results of non-woven fabric anti-ultraviolet and anti-mildew performance

[0081]

[0082] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A strong tear-resistant non-woven fabric, characterized in that: The invention is prepared from the following components in parts by weight: 40-70 parts of polypropylene, 30-45 parts of polyethylene terephthalate, 6-15 parts of nano silicon dioxide, 10-25 parts of modified phenolic fiber, 10-16 parts of epoxy resin, 10-16 parts of dibutyl phthalate and 6-9 parts of polyurethane.

2. The tear-resistant nonwoven fabric according to claim 1, characterized in that: The preparation method of the modified phenolic fiber comprises the following steps: (1) placing phenolic fiber in an ethanol aqueous solution, adding KH550, adjusting the pH of the system, refluxing the reaction, filtering, washing, and drying the product to obtain pretreated fiber; (2) Caffeic acid was added to DMF, followed by EDC and NHS, and the pH of the system was adjusted. The mixture was stirred and activated under a nitrogen atmosphere, and then the pretreated fiber was immersed in the mixture, and the temperature was raised to react. The product was filtered, washed, and dried to obtain the grafted fiber. (3) The grafted fiber is immersed in toluene, and then N-allyl-2-hydroxybenzamide and AIBN are added, and the reaction is stirred under a nitrogen atmosphere. The product is filtered, washed, and dried to obtain modified phenolic fiber.

3. The tear-resistant nonwoven fabric according to claim 2, characterized in that: In step (1), the phenolic fiber has a diameter of 10 to 50 μm and a length of 0.5 to 4 mm.

4. The tear-resistant nonwoven fabric according to claim 2, characterized in that: In step (1), the usage ratio of phenolic fiber, ethanol aqueous solution and KH550 is 10 g:100-150 mL:0.5-3 g; the volume ratio of ethanol to deionized water in the ethanol aqueous solution is 85-95:5-15.

5. The tear-resistant nonwoven fabric according to claim 2, characterized in that: In step (1), glacial acetic acid is used to adjust the pH of the system to 4-5; the reflux reaction conditions are reflux reaction at 70-85° C. for 2-5 hours.

6. The tear-resistant nonwoven fabric according to claim 2, characterized in that: In step (2), the usage ratio of caffeic acid, DMF, EDC, NHS and pretreated fiber is 0.8-3.2 g:100-150 mL:1.2-2.4 g:0.6-1.2 g:10 g.

7. The tear-resistant nonwoven fabric according to claim 2, characterized in that: In step (2), the pH of the system is adjusted to 7-9 with triethylamine; the stirring activation condition is stirring and activating at room temperature for 1-2 hours; the temperature reaction condition is reacting at 40-55°C for 8-16 hours.

8. The tear-resistant nonwoven fabric according to claim 2, characterized in that: In step (3), the usage ratio of the grafted fiber, toluene, N-allyl-2-hydroxybenzamide, and AIBN is 10 g: 100-150 mL: 1.2-3.6 g: 0.1-0.4 g.

9. The tear-resistant nonwoven fabric according to claim 2, characterized in that: In step (3), the stirring reaction condition is 70-85° C. for 12-16 hours.

10. A method for preparing a highly tear-resistant nonwoven fabric according to any one of claims 1 to 9, characterized in that: The method comprises the following steps: mixing the components and conveying them to a screw extruder for melt extrusion to obtain a molten slurry, filtering and metering the slurry and then feeding it into a spinning box, spinning the slurry through a spinneret, cooling and stretching the slurry through air flow to form filament fibers, uniformly adsorbing the filament fibers onto a conveyor belt to form a fiber web, and hot-rolling the slurry through a hot rolling mill to obtain the highly tear-resistant non-woven fabric.

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