Functional non-woven fabric and preparation method thereof

Abstract

The invention discloses a functional non-woven fabric and a preparation method thereof, and the preparation method comprises the following steps: S1, mixing 80-120 parts by weight of polypropylene, 5-10 parts by weight of maleic anhydride grafted polypropylene, 3-8 parts by weight of rutile titanium dioxide and 0.5-2.5 parts by weight of an antistatic agent, feeding the mixture into a screw extruder, melting, plasticizing, filtering and removing impurities to obtain a uniform melt; s2, the uniform melt obtained in the step S1 is subjected to spinning net forming and needling reinforcement treatment in sequence and then is dried and shaped, and a non-woven fabric blank is obtained; and S3, performing post-treatment on the non-woven fabric blank obtained in the step S2 to obtain the functional non-woven fabric. In the invention, through a conventional preparation process and secondary finishing, the prepared non-woven fabric has excellent comprehensive properties such as flame retardance, antibacterial property, mechanical property and the like, and the flame retardance and the antibacterial property are not obviously reduced after the non-woven fabric is washed.

Description

Technical Field

[0001] The present invention belongs to the technical field of non-woven materials, and particularly relates to a functional non-woven fabric and a preparation method thereof. Background Art

[0002] Non-woven fabric, also known as non-woven cloth or non-woven fabric, is a sheet material formed by orienting or randomly arranging and reinforcing fibers through physical, chemical or mechanical methods. The production of non-woven fabric does not rely on the spinning and weaving steps of traditional textile processes, but directly uses chemical fibers such as polypropylene (PP), polyester (PET) or natural fibers (such as cotton, hemp) to form a fiber web structure, and then is prepared by treatment processes such as hydroentangling, needling, and hot rolling. At present, non-woven fabrics are widely used in medical and health (such as masks, etc.), agriculture (such as seedling raising bags, etc.), industry and environmental protection (such as filter materials, etc.), construction and packaging (such as food packaging, etc.).

[0003] The raw materials for preparing non-woven fabrics include natural fibers, regenerated fibers, synthetic polymers (such as polypropylene, polyester, polyethylene, polyamide, polyvinyl chloride, etc.). Among them, polypropylene non-woven fabric has become the core material in the medical, environmental protection and industrial fields due to its advantages such as light weight, corrosion resistance, and antibacterial properties. However, problems such as its flammability and poor antibacterial properties still need to be solved through material modification or technological innovation.

[0004] In the prior art, for example, patent document CN103696134A provides a flame-retardant non-woven fabric sound-absorbing cotton and a preparation method thereof, which is composed of a top layer, a back layer, and a fiber cotton layer sandwiched between the top layer and the back layer. The top layer and the back layer adopt non-woven fabric materials. The non-woven fabric is made by melt blowing method from the following raw materials in parts by weight: isotactic polypropylene 100, carbon black 4-5, chlorinated paraffin 12-15, ferrocene 3-4, cetyltrimethylammonium bromide 1-2, straw 10-12, bentonite 12-14, zeolite powder 5-7, Coptis chinensis 2-3, Amomum kravanh 1-2, Syzygium aromaticum 1-2, Aucklandia lappa 2-3, Myrica rubra bark 1-2, auxiliary agent 4-5; The auxiliary agent is made from the following raw materials in parts by weight: clay 10-12, nano-carbon 1-2, polytetrafluoroethylene powder 3-4, silane coupling agent KH-550 1-2, zinc dialkyldithiophosphate 2-3, propyl gallate 3-4, coix seed oil 2-3, vanadium diboride 1-2, tea polyphenols 2-3, 1,6-hexanediol diacrylate 2-3, nano-aluminum trioxide 1-2, zinc cyanurate 2-3, epoxy butyl oleate 3-4; The special preparation method is to put the clay in a calcination furnace and calcine it at 700-730 °C for 3-4 hours, then crush it, mix it with other remaining materials, and grind it for 1-2 hours to obtain. In the above technical solution, a large number and variety of pigments are used, the preparation process is not easy to control, and the traditional Chinese medicines used are prone to cause allergic reactions.

[0005] For another example, patent document CN104385730A provides a flame-retardant non-woven fabric, including a first non-woven fabric layer, a reinforcement layer, a second non-woven fabric layer, and a flame-retardant film layer. The reinforcement layer is located between the first non-woven fabric layer and the second non-woven fabric layer. Both the first non-woven fabric layer and the second non-woven fabric layer are made of polyester fiber cloth. The reinforcement layer is an activated carbon reinforcement layer. There are two layers of the flame-retardant film layer, which are respectively attached to the outer surfaces of the first non-woven fabric and the second non-woven fabric. The flame-retardant film layer uses a PVC flame-retardant film. However, in the above technical solution, the specific material composition of the flame-retardant film layer is not introduced, and the flame-retardant effect is not clear.

[0006] For another example, patent document CN110747583A provides a preparation method of a high flame-retardant non-woven fabric, including the following steps: First step, polypropylene raw material treatment: Rinse polypropylene with deionized water and send it to a hopper type hot air dryer for convective drying. The drying temperature is 140 - 145 °C, and the drying time is 1 - 3 h. Second step, mixing: Weigh each raw material according to the following weight parts: 70 - 80 parts of polypropylene, 10 - 13 parts of maleic anhydride grafted polypropylene, 1.3 - 2.1 parts of a degradation agent, 14.5 - 16.5 parts of plant fiber, 0.2 - 0.3 parts of an antioxidant, 0.1 - 0.2 parts of a coupling agent, and 0.1 - 0.2 parts of a processing aid. Send them into a screw extruder for melt mixing. Third step, web forming: Make the melt enter a meltblown die head, extrude it through the spinneret holes on the die head, and then perform super multiple drawing by hot air flow. The fibers are cooled and solidified and deposited on a receiving device, and then wound into a web to obtain the non-woven fabric. Fourth step, preparation of the flame-retardant finishing liquid: The flame-retardant finishing liquid includes the following components in weight parts: 20 - 30 parts of a nitrogen-phosphorus based flame retardant, 5 - 6 parts of organic montmorillonite, 2 - 3 parts of a penetrant, and 70 - 80 parts of water. Mix the nitrogen-phosphorus based flame retardant, organic montmorillonite, penetrant, and water evenly according to the weight parts to prepare the flame-retardant finishing liquid. Fifth step, flame-retardant finishing. The dispersibility of montmorillonite and the flame retardant in water in the used flame-retardant finishing liquid will greatly affect the effect of flame-retardant finishing.

[0007] Therefore, it is hoped that the present invention. Summary of the Invention

[0008] Aiming at the deficiencies of the existing technology, the purpose of the present invention is to provide a functional non-woven fabric and its preparation method. Through a conventional preparation process plus secondary finishing, the obtained non-woven fabric has excellent comprehensive properties such as flame retardancy, antibacterial property, and mechanical property, and the flame retardancy and antibacterial property do not show obvious reduction after washing.

[0009] To achieve the above purpose, the present invention adopts the following technical solutions:

[0010] A preparation method of a functional non-woven fabric, including the following steps:

[0011] S1. Mix 80 - 120 parts by weight of polypropylene, 5 - 10 parts of maleic anhydride grafted polypropylene, 3 - 8 parts of rutile titanium dioxide, and 0.5 - 2.5 parts of antistatic agent, and then feed the mixture into a screw extruder. After melting, plasticizing, filtering, and removing impurities, a uniform melt is obtained.

[0012] S2. Subject the uniform melt obtained in step S1 to spinning and web - forming, and then needling reinforcement treatment successively. After drying and shaping, a non - woven fabric blank is obtained.

[0013] S3. Perform post - treatment on the non - woven fabric blank obtained in step S2 to obtain the functional non - woven fabric.

[0014] Further, in step S1, the melt index of the polypropylene is 20 - 50 g / 10 min, and the antistatic agent is selected from one of dodecyl trimethyl ammonium chloride and stearic acid;

[0015] The filtration mesh number is 150 - 250 meshes;

[0016] The melting and plasticizing temperature is 180 - 240 °C.

[0017] Further, in step S2, the needling density is 300 - 500 needles / cm 2 , and the drying temperature is 105 °C.

[0018] Further, in step S3, the post - treatment includes:

[0019] Place the non - woven fabric blank in a primary finishing solution and soak for 15 - 25 min. Then, press out the excess solution through a calender, and then dry at 100 - 120 °C to obtain a pre - finished non - woven fabric;

[0020] Subsequently, place the pre - finished non - woven fabric in a secondary finishing solution, soak for 10 - 20 min, then press out the excess solution through a calender, and then dry at 100 - 120 °C to obtain the functional non - woven fabric.

[0021] Further, the preparation of the primary finishing solution includes the following steps:

[0022] S11. Add tributyl phosphate to ethanol, adjust the pH of the system, then add montmorillonite, and then stir under heating conditions. After the treatment is completed, filter and dry to obtain modified montmorillonite;

[0023] S12. Mix attapulgite with sodium hydroxide and perform high - temperature treatment. After the treatment is completed, obtain pre - modified attapulgite;

[0024] S13. Add the pre-modified attapulgite obtained in step S12 into water. After dispersing it evenly, add potato starch. After dispersing evenly again, raise the temperature for treatment to obtain a primary reaction product. Subsequently, add the obtained primary reaction product into water, then add ammonium ferrous sulfate, stir again and carry out a high-temperature reaction. After the reaction ends, carry out washing and drying treatments to obtain material a;

[0025] S14. Add sodium trimetaphosphate into a sodium hydroxide solution, then add material a obtained in step S13, and then carry out a heating treatment. After the treatment is completed, carry out washing and drying treatments again to obtain material b;

[0026] S15. Add the modified montmorillonite obtained in step S11 and material b obtained in step S14 into water in sequence. After soaking, carry out a stirring treatment, and finally carry out filtration, drying, grinding and sieving treatments to obtain material c;

[0027] S16. Add material c into water, then add sodium dodecyl sulfate and acrylic emulsion, and stir evenly to obtain a primary finishing liquid.

[0028] Further, in step S11, the dosage ratio of tributyl phosphate, montmorillonite and ethanol is 0.35 - 0.5 g: 1 g: 5 - 10 mL;

[0029] The pH value of the system is adjusted with acetic acid, and the pH value is adjusted to 3.5 - 4;

[0030] The heating temperature is 30 - 35 °C, and the stirring treatment time is 2 - 6 h.

[0031] Further, in step S12, the mass ratio of attapulgite to sodium hydroxide is 1: 0.4 - 0.65; the high-temperature treatment temperature is 780 - 800 °C, and the treatment time is 0.5 - 2 h;

[0032] In step S13, the dosage ratio of pre-modified attapulgite, water and potato starch is 1 g: 60 - 100 mL: 1.5 - 2 g; raise the temperature to 90 - 95 °C, and the treatment time after raising the temperature is 15 - 25 min;

[0033] The dosage ratio of the primary reaction product, water and ammonium ferrous sulfate is 1 mL: 4 - 8 mL: 4 - 8 mL; the concentration of ammonium ferrous sulfate is 1.5 - 1.8 mol / L; the high-temperature reaction temperature is 170 - 190 °C, and the reaction time is 8 - 24 h;

[0034] In step S14, the dosage ratio of sodium trimetaphosphate, sodium hydroxide solution and material a is 1 g: 60 - 100 mL: 1.5 - 2.5 g; the heating treatment temperature is 30 - 35 °C, and the treatment time is 1 - 4 h; the concentration of the sodium hydroxide solution is 2 - 3.5 wt%.

[0035] Further, in step S15, the mass ratio of the modified montmorillonite, material b, and water is 1: 1.5-2: 10-15; the soaking time is 12-24 h; the stirring speed is 80-120 rpm, and the stirring time is 1-4 h; the mesh number of grinding and sieving is 100-150 meshes;

[0036] In step S16, the mass ratio of material c, water, sodium dodecyl sulfate, and acrylic emulsion is 6-10: 100: 1.5-2.5: 25-35.

[0037] Further, the preparation of the secondary finishing liquid includes the following steps:

[0038] S21. According to the dosage ratio of 1 g: 5-10 mL, add silicon dioxide to the mixed concentrated acid, and treat it at room temperature for 0.5-2.5 h. After the treatment is completed, wash it to obtain modified silicon dioxide; among them, the mixed concentrated acid is obtained by mixing concentrated sulfuric acid and hydrogen peroxide solution with a volume ratio of 7: 3;

[0039] S22. Add chitosan to a 0.5-1 wt% acetic acid solution, stir evenly to obtain a chitosan acetic acid solution with a concentration of 1-2 wt%;

[0040] S23. According to the mass ratio of 0.5-0.8: 100, add the modified silicon dioxide obtained in step S21 to the chitosan acetic acid solution obtained in step S22, stir at 30-35 °C for 2-6 h. After the treatment is completed, filter, dry, and grind and sieve through 100-150 meshes to obtain material d;

[0041] S24. Add material d to water, then add sodium dodecyl sulfate and acrylic emulsion, and stir evenly to obtain the secondary finishing liquid; among them, the mass ratio of material d: water: sodium dodecyl sulfate and acrylic emulsion is 3-6: 100: 1.2-2: 25-35.

[0042] Of course, the present invention also hopes to protect the functional non-woven fabric prepared by the above method.

[0043] Compared with the prior art, the present invention has the following beneficial effects:

[0044] The non-woven fabric provided by the present invention uses polypropylene as the main raw material, and is prepared through processes such as melting, spinning, needling, and post-treatment. The overall process is simple, and the obtained non-woven fabric has good flame retardant and antibacterial properties.

[0045] In the present invention, the post-treatment is mainly based on the secondary finishing process, with flame retardant finishing first and then antibacterial finishing. Compared with the simultaneous flame retardant finishing and antibacterial finishing, the performance of the obtained non-woven fabric is better.

[0046] In the present invention, the primary finishing uses montmorillonite and attapulgite as the main raw materials. Both montmorillonite and attapulgite are relatively commonly used and good flame retardant fillers. However, when used, they have the disadvantage of poor dispersibility. Moreover, when montmorillonite is used alone, there is a shortage of large dosage, which leads to an increase in the density of the non-woven fabric and affects the lightweight use of the non-woven fabric. In addition, a high addition amount of montmorillonite will also cause a decrease in the air permeability and flexibility of the non-woven fabric, thereby reducing the usage experience. Similarly, when a large amount of attapulgite is used alone, it will also reduce the air permeability and flexibility of the non-woven fabric, thereby reducing the usage experience. Therefore, the present invention selects the compound of the two. In the specific use process, montmorillonite and attapulgite are respectively modified first. Among them, montmorillonite is intercalated and modified with tributyl phosphate. On the one hand, it can increase the layer spacing of montmorillonite and improve its dispersibility. On the other hand, the introduced tributyl phosphate is a phosphorus-based flame retardant, which can further improve the flame retardancy of montmorillonite. However, there is an important consideration for choosing to use tributyl phosphate, that is, the subsequently modified attapulgite also contains phosphorus atoms, and the two can form a multi-level hydrogen bond system and weak interaction forces to strengthen the finishing effect. Attapulgite is first subjected to high-temperature alkali treatment. After constructing rich pores, it is beneficial to the subsequent grafting of potato starch, and then to the formation of subsequent phosphate esters. The pre-modified attapulgite is then subjected to the preparation of carbon materials by hydrothermal method to introduce oxygen-containing groups, which is beneficial to the formation of subsequent phosphate esters on attapulgite. The formation of phosphate esters is beneficial to improving the flame retardancy of attapulgite, and is also beneficial to forming a large network system with modified montmorillonite to strengthen the finishing effect. In short, through the specific separate modification and then composite use of montmorillonite and attapulgite, while reducing the agglomeration of the two, it also synergistically improves the effect of flame retardant finishing, making the flame retardant effect of the prepared non-woven fabric good.

[0047] In the secondary finishing, chitosan and silica are used as the main raw materials. Chitosan has good antibacterial properties, but when used alone, there is an obvious shortage that the antibacterial property decreases significantly after many washing times. Therefore, in the present invention, silica and chitosan are used in combination to finish the non-woven fabric. The modified silica can form a stable composite structure with chitosan through interaction forces or hydrogen bond interactions, improving the antibacterial persistence of chitosan. For this reason, in the present invention, silica is modified with concentrated acid. The purpose of this simple modification is to enrich the groups on the surface of silica, so that chitosan and silica can improve the composite effect based on the rich functional groups, and then improve the effect of antibacterial finishing, thereby improving the antibacterial property of the non-woven fabric.

[0048] In the present invention, both the primary finishing liquid and the secondary finishing liquid use acrylic emulsion as the film-forming main body, and sodium dodecyl sulfate is used as an emulsifier to improve the dispersibility of substances.

[0049] Of course, through the primary and secondary finishing, the mechanical properties of the non-woven fabric can also be improved to a certain extent.

[0050] In summary, the non-woven fabric obtained in the present invention has excellent flame retardancy and antibacterial properties, and the antibacterial and flame retardant properties do not show significant decline after washing, with excellent performance. Specific Embodiments

[0051] The embodiments of the present invention will be described in detail below. All the embodiments are exemplary and are intended to explain the present invention and should not be construed as a limitation to the present invention.

[0052] In the present invention, unless otherwise specified, all raw materials are purchased through market channels. Among them, the polypropylene grade is HY525, and the manufacturer is Fushun Petrochemical Company, PetroChina; maleic anhydride grafted polypropylene, grade Fusabond P613, manufacturer is DuPont Company, USA; rutile titanium dioxide is purchased from Tianjin Zhiyuan Chemical Reagent Co., Ltd.; attapulgite is purchased from Changzhou Naoou New Materials Technology Co., Ltd.; potato starch is purchased from Gansu Lantian Potato Industry Development Co., Ltd.; montmorillonite is purchased from Tuoyi New Materials (Guangzhou) Co., Ltd.; silica is purchased from Henan Chuchuan Industry Co., Ltd., with a particle size of about 1000 mesh; chitosan is purchased from Shanghai Aladdin Biochemical Technology Co., Ltd.

[0053] In the present invention, the melting and plasticizing, impurity removal, spinning into a web, needling, and drying and shaping involved can all be implemented using existing devices, which are relatively mature technologies in the non-woven fabric production field. The present invention does not specifically describe or limit the above processes or devices, and is subject to the implementation by those skilled in the art.

[0054] In the embodiments of the present invention, the main process conditions for melting and plasticizing are: the feeding section is 180 °C, the plasticizing section is 220 °C, and the homogenizing section is 228 °C. A high-shear screw is used to improve the melting efficiency; the spinning into a web can adopt one of electrostatic fiber splitting, mechanical fiber splitting, or air flow fiber splitting, preferably air flow fiber splitting. The fibers after fiber splitting are evenly laid on a negative pressure mesh curtain to form a fiber web, which is a relatively mature process; needling reinforcement is also a common process, and the present invention does not describe it in detail and is subject to the implementation by those skilled in the art.

[0055] It should be particularly emphasized that the parts by weight used in this embodiment can be understood as a ratio, and the usage amounts of various substances in actual use can be adjusted on this basis.

[0056] Example 1

[0057] A method for preparing a functional non-woven fabric includes the following steps:

[0058] S1. Mix 100 parts by weight of polypropylene, 9 parts of maleic anhydride grafted polypropylene, 5 parts of rutile titanium dioxide, and 1.2 parts of dodecyl trimethyl ammonium chloride, and then feed them into a screw extruder. After melting and plasticizing, and filtering and removing impurities through a 200-mesh filter, a uniform melt is obtained.

[0059] S2. Perform melt spinning and needle punching reinforcement treatments (the needle punching density is 400 needles / cm 2 ) on the uniform melt obtained in step S1, and then dry and shape it to obtain a non-woven fabric blank.

[0060] S3. Perform post-treatment on the non-woven fabric blank obtained in step S2 to obtain the functional non-woven fabric.

[0061] Among them, the post-treatment includes: first place the non-woven fabric blank in a primary finishing solution, soak it for 15 minutes, then press out the excess solution through a calendar, and then dry it at 110°C to obtain a pre-finished non-woven fabric.

[0062] Subsequently, place the pre-finished non-woven fabric in a secondary finishing solution, soak it for 10 minutes, then press out the excess solution through a calendar, and then dry it at 110°C to obtain the functional non-woven fabric.

[0063] Among them, the preparation of the primary finishing solution includes the following steps:

[0064] S11. Add tributyl phosphate to ethanol, adjust the pH of the system to 3.8 with acetic acid, then add montmorillonite, and then stir and process it under heating conditions (30°C, 4h); after the treatment is completed, filter and dry it to obtain modified montmorillonite; among them, the dosage ratio of tributyl phosphate, montmorillonite, and ethanol is 0.4g:1g:10mL.

[0065] S12. Mix attapulgite and sodium hydroxide in a mass ratio of 1:0.45 and perform high-temperature treatment (790°C, 0.5h). After the treatment is completed, obtain pre-modified attapulgite.

[0066] S13. Add the pre-modified attapulgite obtained in step S12 to water, disperse it evenly, then add potato starch, disperse it evenly again, heat it to 95°C and post-treat it for 20 minutes to obtain a primary reaction product; then add the obtained primary reaction product to water, then add 1.6 mol / L ammonium ferrous sulfate, stir again and perform a high-temperature reaction (180°C, 16h). After the reaction is completed, wash and dry it to obtain material a; among them, the dosage ratio of pre-modified attapulgite, water, and potato starch is 1g:80mL:1.8g; the dosage ratio of the primary reaction product, water, and ammonium ferrous sulfate is 1mL:8mL:5mL.

[0067] S14. Add sodium trimetaphosphate to a 2.5 wt% sodium hydroxide solution, then add the material a obtained in step S13, and then carry out a heat treatment (35 °C, 2 h). After the treatment is completed, wash and dry it to obtain material b. Among them, the dosage ratio of sodium trimetaphosphate, sodium hydroxide solution, and material a is 1 g: 90 mL: 2 g;

[0068] S15. Add the modified montmorillonite obtained in step S11 and the material b obtained in step S14 to water in sequence. After soaking for 16 h, carry out a stirring treatment (100 rpm, 1 h), and finally carry out filtration, drying, and sieving through a 150-mesh sieve to obtain material c. Among them, the mass ratio of modified montmorillonite, material b, and water is 1: 2: 12;

[0069] S16. Add material c to water, then add sodium dodecyl sulfate and acrylic emulsion, and stir evenly to obtain the primary finishing liquid. Among them, the mass ratio of material c, water, sodium dodecyl sulfate, and acrylic emulsion is 8: 100: 2: 28.

[0070] Among them, the preparation of the secondary finishing liquid includes the following steps:

[0071] S21. Add silicon dioxide to the mixed concentrated acid according to the dosage ratio of 1 g: 8 mL, and treat it at room temperature for 1 h. After the treatment is completed, wash it to obtain modified silicon dioxide. Among them, the mixed concentrated acid is obtained by mixing concentrated sulfuric acid and hydrogen peroxide solution with a volume ratio of 7: 3;

[0072] S22. Add chitosan to a 0.8 wt% acetic acid solution and stir evenly to obtain a chitosan acetic acid solution with a concentration of 1.5 wt%;

[0073] S23. Add the modified silicon dioxide obtained in step S21 to the chitosan acetic acid solution obtained in step S22 according to the mass ratio of 0.6: 100, stir at 30 °C for 4 h. After the treatment is completed, carry out filtration, drying, and sieving through a 150-mesh sieve to obtain material d;

[0074] S24. Add material d to water, then add sodium dodecyl sulfate and acrylic emulsion, and stir evenly to obtain the secondary finishing liquid. Among them, the mass ratio of material d: water: sodium dodecyl sulfate and acrylic emulsion is 4: 100: 1.5: 30.

[0075] Example 2

[0076] A method for preparing a functional non-woven fabric includes the following steps:

[0077] S1. Mix 100 parts by weight of polypropylene, 8.5 parts of maleic anhydride grafted polypropylene, 6 parts of rutile titanium dioxide, and 1.3 parts of dodecyl trimethyl ammonium chloride, and then feed the mixture into a screw extruder. After melting and plasticizing, and filtering and removing impurities through a 200-mesh sieve, a uniform melt is obtained.

[0078] S2. Subject the uniform melt obtained in step S1 to melt spinning and needle punching reinforcement treatments (the needle punching density is 450 needles / cm 2 ), and then dry and shape it to obtain a non-woven fabric blank.

[0079] S3. Perform post-treatment on the non-woven fabric blank obtained in step S2 to obtain the functional non-woven fabric.

[0080] Among them, the post-treatment includes: first place the non-woven fabric blank in a primary finishing solution, soak it for 15 minutes, then press out the excess solution through a calender, and then dry it at 110°C to obtain a pre-finished non-woven fabric.

[0081] Subsequently, place the pre-finished non-woven fabric in a secondary finishing solution, soak it for 10 minutes, then press out the excess solution through a calender, and then dry it at 110°C to obtain the functional non-woven fabric.

[0082] Among them, the preparation of the primary finishing solution includes the following steps:

[0083] S11. Add tributyl phosphate to ethanol, adjust the pH of the system to 3.8 with acetic acid, then add montmorillonite, and then stir and process it under heating conditions (30°C, 4h); after the treatment is completed, filter and dry it to obtain modified montmorillonite; among them, the dosage ratio of tributyl phosphate, montmorillonite, and ethanol is 0.4g:1g:10mL.

[0084] S12. Mix attapulgite and sodium hydroxide in a mass ratio of 1:0.45 and then perform high-temperature treatment (795°C, 0.5h). After the treatment is completed, obtain pre-modified attapulgite.

[0085] S13. Add the pre-modified attapulgite obtained in step S12 to water, disperse it evenly, then add potato starch, disperse it evenly again, heat it to 95°C and post-treat it for 20 minutes to obtain a primary reaction product; then add the obtained primary reaction product to water, then add 1.6 mol / L ammonium ferrous sulfate, stir again and then perform a high-temperature reaction (180°C, 12h). After the reaction is completed, wash and dry it to obtain material a; among them, the dosage ratio of pre-modified attapulgite, water, and potato starch is 1g:90mL:1.75g; the dosage ratio of the primary reaction product, water, and ammonium ferrous sulfate is 1mL:9mL:4.5mL.

[0086] S14. Add sodium trimetaphosphate to a 2.5 wt% sodium hydroxide solution, then add the material a obtained in step S13, and then perform a heat treatment (35 °C, 2 h). After the treatment is completed, wash and dry to obtain material b. Among them, the dosage ratio of sodium trimetaphosphate, sodium hydroxide solution, and material a is 1 g: 100 mL: 2 g;

[0087] S15. Add the modified montmorillonite obtained in step S11 and the material b obtained in step S14 to water in sequence. After soaking for 16 h, perform a stirring treatment (100 rpm, 1 h), and finally perform filtration, drying, and sieving through a 150-mesh sieve to obtain material c. Among them, the mass ratio of modified montmorillonite, material b, and water is 1: 2: 12;

[0088] S16. Add material c to water, then add sodium dodecyl sulfate and acrylic emulsion, and stir evenly to obtain the primary finishing liquid. Among them, the mass ratio of material c, water, sodium dodecyl sulfate, and acrylic emulsion is 8: 100: 2: 28.

[0089] Among them, the preparation of the secondary finishing liquid includes the following steps:

[0090] S21. Add silicon dioxide to the mixed concentrated acid according to the dosage ratio of 1 g: 8 mL, and treat it at room temperature for 1 h. After the treatment is completed, wash to obtain modified silicon dioxide. Among them, the mixed concentrated acid is obtained by mixing concentrated sulfuric acid and hydrogen peroxide solution with a volume ratio of 7: 3;

[0091] S22. Add chitosan to a 1 wt% acetic acid solution and stir evenly to obtain a chitosan acetic acid solution with a concentration of 1.5 wt%;

[0092] S23. Add the modified silicon dioxide obtained in step S21 to the chitosan acetic acid solution obtained in step S22 according to the mass ratio of 0.6: 100, stir at 30 °C for 4 h. After the treatment is completed, perform filtration, drying, and sieving through a 150-mesh sieve to obtain material d;

[0093] S24. Add material d to water, then add sodium dodecyl sulfate and acrylic emulsion, and stir evenly to obtain the secondary finishing liquid. Among them, the mass ratio of material d: water: sodium dodecyl sulfate and acrylic emulsion is 4: 100: 1.5: 30.

[0094] Example 3

[0095] A method for preparing a functional non-woven fabric includes the following steps:

[0096] S1. Mix 100 parts by weight of polypropylene, 9.5 parts of maleic anhydride grafted polypropylene, 5.5 parts of rutile titanium dioxide, and 1.1 parts of dodecyl trimethyl ammonium chloride, and then feed the mixture into a screw extruder. After melting and plasticizing, and filtering and removing impurities through a 200-mesh sieve, a uniform melt is obtained.

[0097] S2. Subject the uniform melt obtained in step S1 to melt spinning and needle punching reinforcement treatments (the needle punching density is 450 needles / cm 2 ), and then dry and shape it to obtain a non-woven fabric blank.

[0098] S3. Perform post-treatment on the non-woven fabric blank obtained in step S2 to obtain the functional non-woven fabric.

[0099] Among them, the post-treatment includes: first place the non-woven fabric blank in a primary finishing solution, soak it for 15 minutes, then press out the excess solution through a calender, and then dry it at 110°C to obtain a pre-finished non-woven fabric.

[0100] Subsequently, place the pre-finished non-woven fabric in a secondary finishing solution, soak it for 10 minutes, then press out the excess solution through a calender, and then dry it at 110°C to obtain the functional non-woven fabric.

[0101] Among them, the preparation of the primary finishing solution includes the following steps:

[0102] S11. Add tributyl phosphate to ethanol, adjust the pH of the system to 3.8 with acetic acid, then add montmorillonite, and then stir and process it under heating conditions (30°C, 4 hours); after the treatment is completed, filter and dry it to obtain modified montmorillonite; among them, the dosage ratio of tributyl phosphate, montmorillonite, and ethanol is 0.42 g: 1 g: 9 mL.

[0103] S12. Mix attapulgite and sodium hydroxide in a mass ratio of 1:0.5 and perform high-temperature treatment (795°C, 0.5 hours). After the treatment is completed, obtain pre-modified attapulgite.

[0104] S13. Add the pre-modified attapulgite obtained in step S12 to water, disperse it evenly, then add potato starch, disperse it evenly again, raise the temperature to 95°C and post-treat it for 20 minutes to obtain a primary reaction product; then add the obtained primary reaction product to water, then add 1.8 mol / L ammonium ferrous sulfate, stir again and perform a high-temperature reaction (180°C, 12 hours). After the reaction is completed, wash and dry it to obtain material a; among them, the dosage ratio of pre-modified attapulgite, water, and potato starch is 1 g: 90 mL: 1.7 g; the dosage ratio of the primary reaction product, water, and ammonium ferrous sulfate is 1 mL: 10 mL: 4 mL.

[0105] S14. Add sodium trimetaphosphate to a 2.5 wt% sodium hydroxide solution, then add the material a obtained in step S13, and then conduct a heat treatment (35 °C, 2 h). After the treatment is completed, conduct washing and drying treatments to obtain material b. Among them, the dosage ratio of sodium trimetaphosphate, sodium hydroxide solution, and material a is 1 g: 85 mL: 2 g;

[0106] S15. Add the modified montmorillonite obtained in step S11 and the material b obtained in step S14 to water in sequence. After soaking for 16 h, conduct a stirring treatment (100 rpm, 1 h). Finally, conduct filtration, drying, and sieving through a 150-mesh sieve to obtain material c. Among them, the mass ratio of modified montmorillonite, material b, and water is 1: 2: 12;

[0107] S16. Add material c to water, then add sodium dodecyl sulfate and acrylic emulsion, and stir evenly to obtain the primary finishing liquid. Among them, the mass ratio of material c, water, sodium dodecyl sulfate, and acrylic emulsion is 8: 100: 2: 28.

[0108] Among them, the preparation of the secondary finishing liquid includes the following steps:

[0109] S21. Add silica to the mixed concentrated acid according to the dosage ratio of 1 g: 8 mL, and conduct a treatment at room temperature for 1 h. After the treatment is completed, conduct a washing treatment to obtain modified silica. Among them, the mixed concentrated acid is obtained by mixing concentrated sulfuric acid and hydrogen peroxide solution with a volume ratio of 7: 3;

[0110] S22. Add chitosan to a 1 wt% acetic acid solution and stir evenly to obtain a chitosan acetic acid solution with a concentration of 1.5 wt%;

[0111] S23. Add the modified silica obtained in step S21 to the chitosan acetic acid solution obtained in step S22 according to the mass ratio of 0.6: 100, and stir at 30 °C for 4 h. After the treatment is completed, conduct filtration, drying, and sieving through a 150-mesh sieve to obtain material d;

[0112] S24. Add material d to water, then add sodium dodecyl sulfate and acrylic emulsion, and stir evenly to obtain the secondary finishing liquid. Among them, the mass ratio of material d: water: sodium dodecyl sulfate and acrylic emulsion is 4: 100: 1.5: 30.

[0113] Comparative Example 1

[0114] Compared with Example 1, in Comparative Example 1, the flame retardancy and antibacterial properties are subjected to a single finishing instead of two times, that is, the primary finishing liquid and the secondary finishing liquid are combined and then used for finishing. Specifically: A preparation method of a functional non-woven fabric includes the following steps:

[0115] S1. Mix 100 parts by weight of polypropylene, 9 parts of maleic anhydride grafted polypropylene, 5 parts of rutile titanium dioxide, and 1.2 parts of dodecyl trimethyl ammonium chloride, and then feed them into a screw extruder. After melting and plasticizing, and filtering and removing impurities through a 200-mesh screen, a uniform melt is obtained.

[0116] S2. Perform melt spinning and needle punching reinforcement treatments (the needle punching density is 400 needles / cm 2 ) on the uniform melt obtained in step S1, and then dry and shape it to obtain a non-woven fabric blank.

[0117] S3. Perform post-treatment on the non-woven fabric blank obtained in step S2 to obtain the functional non-woven fabric.

[0118] Among them, the post-treatment includes: placing the non-woven fabric blank in a finishing solution, soaking for 15 minutes, then pressing out the excess solution through a calender, and then drying at 110°C to obtain the multi-functional non-woven fabric. The finishing solution is obtained by mixing a primary finishing solution and a secondary finishing solution.

[0119] Among them, the preparation of the primary finishing solution includes the following steps:

[0120] S11. Add tributyl phosphate to ethanol, adjust the pH of the system to 3.8 with acetic acid, then add montmorillonite, and then stir and process under heating conditions (30°C, 4h); after the treatment is completed, filter and dry to obtain modified montmorillonite; among them, the dosage ratio of tributyl phosphate, montmorillonite, and ethanol is 0.4g:1g:10mL.

[0121] S12. Mix attapulgite and sodium hydroxide according to a mass ratio of 1:0.45 and perform high-temperature treatment (790°C, 0.5h). After the treatment is completed, obtain pre-modified attapulgite.

[0122] S13. Add the pre-modified attapulgite obtained in step S12 to water, disperse it evenly, then add potato starch, disperse it evenly again, heat up to 95°C and post-treat for 20 minutes to obtain a primary reaction product; then add the obtained primary reaction product to water, then add 1.6 mol / L ammonium ferrous sulfate, stir again and perform a high-temperature reaction (180°C, 16h). After the reaction is completed, wash and dry to obtain material a; among them, the dosage ratio of pre-modified attapulgite, water, and potato starch is 1g:80mL:1.8g; the dosage ratio of the primary reaction product, water, and ammonium ferrous sulfate is 1mL:8mL:5mL.

[0123] S14. Add sodium trimetaphosphate to a 2.5 wt% sodium hydroxide solution, then add the material a obtained in step S13, and then conduct a heat treatment (35 °C, 2 h). After the treatment is completed, conduct washing and drying treatments to obtain material b. Among them, the dosage ratio of sodium trimetaphosphate, sodium hydroxide solution, and material a is 1 g: 90 mL: 2 g;

[0124] S15. Add the modified montmorillonite obtained in step S11 and the material b obtained in step S14 to water in sequence. After soaking for 16 h, conduct a stirring treatment (100 rpm, 1 h). Finally, conduct filtration, drying, and sieving through a 150-mesh sieve to obtain material c. Among them, the mass ratio of modified montmorillonite, material b, and water is 1: 2: 12;

[0125] S16. Add material c to water, then add sodium dodecyl sulfate and acrylic emulsion, and stir evenly to obtain the primary finishing liquid. Among them, the mass ratio of material c, water, sodium dodecyl sulfate, and acrylic emulsion is 8: 100: 2: 28.

[0126] Among them, the preparation of the secondary finishing liquid includes the following steps:

[0127] S21. Add silicon dioxide to the mixed concentrated acid according to a dosage ratio of 1 g: 8 mL, and conduct a treatment at room temperature for 1 h. After the treatment is completed, conduct a washing treatment to obtain modified silicon dioxide. Among them, the mixed concentrated acid is obtained by mixing concentrated sulfuric acid and hydrogen peroxide solution with a volume ratio of 7: 3;

[0128] S22. Add chitosan to a 0.8 wt% acetic acid solution and stir evenly to obtain a chitosan acetic acid solution with a concentration of 1.5 wt%;

[0129] S23. Add the modified silicon dioxide obtained in step S21 to the chitosan acetic acid solution obtained in step S22 according to a mass ratio of 0.6: 100, and stir at 30 °C for 4 h. After the treatment is completed, conduct filtration, drying, and sieving through a 150-mesh sieve to obtain material d;

[0130] S24. Add material d to water, then add sodium dodecyl sulfate and acrylic emulsion, and stir evenly to obtain the secondary finishing liquid. Among them, the mass ratio of material d: water: sodium dodecyl sulfate and acrylic emulsion is 4: 100: 1.5: 30.

[0131] Mix the above primary finishing liquid and secondary finishing liquid, and stir evenly to obtain the said finishing liquid.

[0132] Comparative Example 2

[0133] Compared with Example 1, in Comparative Example 2, the modification of montmorillonite is not carried out, that is, step S11 is omitted. Specifically: A preparation method of a functional non-woven fabric includes the following steps:

[0134] S1. Mix 100 parts by weight of polypropylene, 9 parts of maleic anhydride grafted polypropylene, 5 parts of rutile titanium dioxide, and 1.2 parts of dodecyl trimethyl ammonium chloride, and then feed them into a screw extruder. After melting and plasticizing, and filtering and removing impurities through a 200-mesh filter, a uniform melt is obtained.

[0135] S2. Perform melt spinning and needle punching reinforcement treatments (needle punching density is 400 needles / cm 2 ) on the uniform melt obtained in step S1, and then dry and shape it to obtain a non-woven fabric blank.

[0136] S3. Perform post-treatment on the non-woven fabric blank obtained in step S2 to obtain the functional non-woven fabric.

[0137] Among them, the post-treatment includes: placing the non-woven fabric blank in a primary finishing solution, soaking for 15 min, then removing the excess solution through a calender, and then drying at 110°C to obtain a pre-finished non-woven fabric.

[0138] Subsequently, place the pre-finished non-woven fabric in a secondary finishing solution, soak for 10 min, then remove the excess solution through a calender, and then dry at 110°C to obtain the functional non-woven fabric.

[0139] Among them, the preparation of the primary finishing solution includes the following steps:

[0140] S11. Take montmorillonite and set it aside.

[0141] S12. Mix attapulgite and sodium hydroxide in a mass ratio of 1:0.45 and then perform high-temperature treatment (790°C, 0.5 h). After the treatment is completed, pre-modified attapulgite is obtained.

[0142] S13. Add the pre-modified attapulgite obtained in step S12 to water, disperse it evenly, then add potato starch, disperse it evenly again, heat it to 95°C and perform post-treatment for 20 min to obtain a primary reaction product; subsequently, add the obtained primary reaction product to water, then add ammonium ferrous sulfate of 1.6 mol / L, stir again and perform high-temperature reaction (180°C, 16 h). After the reaction is completed, wash and dry it to obtain material a; among them, the dosage ratio of pre-modified attapulgite, water, and potato starch is 1 g:80 mL:1.8 g; the dosage ratio of the primary reaction product, water, and ammonium ferrous sulfate is 1 mL:8 mL:5 mL.

[0143] S14. Add sodium trimetaphosphate to a 2.5 wt% sodium hydroxide solution, then add material a obtained in step S13, and then perform heating treatment (35°C, 2 h). After the treatment is completed, wash and dry it to obtain material b; among them, the dosage ratio of sodium trimetaphosphate, sodium hydroxide solution, and material a is 1 g:90 mL:2 g.

[0144] S15. Add the montmorillonite obtained in step S11 and the material b obtained in step S14 into water in sequence, soak for 16 h and then carry out stirring treatment (100 rpm, 1 h), and finally carry out filtration, drying, grinding and sieving through a 150-mesh sieve to obtain material c; wherein, the mass ratio of montmorillonite, material b and water is 1:2:12.

[0145] S16. Add material c into water, then add sodium dodecyl sulfate and acrylic emulsion, and stir evenly to obtain the primary finishing liquid; wherein, the mass ratio of material c, water, sodium dodecyl sulfate and acrylic emulsion is 8:100:2:28.

[0146] Among them, the preparation of the secondary finishing liquid includes the following steps:

[0147] S21. Add silicon dioxide into the mixed concentrated acid according to the dosage ratio of 1 g:8 mL, treat at room temperature for 1 h, and after the treatment is completed, carry out washing treatment to obtain modified silicon dioxide; wherein, the mixed concentrated acid is obtained by mixing concentrated sulfuric acid and hydrogen peroxide solution with a volume ratio of 7:3.

[0148] S22. Add chitosan into a 0.8 wt% acetic acid solution, and stir evenly to obtain a chitosan acetic acid solution with a concentration of 1.5 wt%.

[0149] S23. Add the modified silicon dioxide obtained in step S21 into the chitosan acetic acid solution obtained in step S22 according to the mass ratio of 0.6:100, stir at 30 °C for 4 h, and after the treatment is completed, carry out filtration, drying and grinding and sieving through a 150-mesh sieve to obtain material d.

[0150] S24. Add material d into water, then add sodium dodecyl sulfate and acrylic emulsion, and stir evenly to obtain the secondary finishing liquid; wherein, the mass ratio of material d:water:sodium dodecyl sulfate and acrylic emulsion is 4:100:1.5:30.

[0151] Comparative Example 3

[0152] Compared with the examples, in Comparative Example 3, the re-modification of the pre-modified attapulgite is not carried out, that is, steps S13 and S14 are omitted.

[0153] Specifically, a preparation method of a functional non-woven fabric includes the following steps:

[0154] S1. By weight, mix 100 parts of polypropylene, 9 parts of maleic anhydride grafted polypropylene, 5 parts of rutile titanium dioxide, and 1.2 parts of dodecyl trimethyl ammonium chloride, and then send them into a screw extruder. After melting and plasticizing, and then filtering and removing impurities through a 200-mesh sieve, a uniform melt is obtained.

[0155] S2. Successively perform melt spinning into a web and needling consolidation on the uniform melt obtained in step S1 (the needling density is 400 needles / cm 2 ), and then dry and shape it to obtain a non-woven fabric blank;

[0156] S3. Perform post-treatment on the non-woven fabric blank obtained in step S2 to obtain the functional non-woven fabric.

[0157] Among them, the post-treatment includes: placing the non-woven fabric blank in the primary finishing solution first, soaking for 15 min, then passing it through a calendar to remove the excess solution, and then drying at 110 °C to obtain the pre-finished non-woven fabric;

[0158] Subsequently, place the pre-finished non-woven fabric in the secondary finishing solution, soak for 10 min, then pass it through a calendar to remove the excess solution, and then dry at 110 °C to obtain the functional non-woven fabric.

[0159] Among them, the preparation of the primary finishing solution includes the following steps:

[0160] S11. Add tributyl phosphate to ethanol, then adjust the pH of the system to 3.8 with acetic acid, then add montmorillonite, and then stir under heating conditions (30 °C, 4 h); after the treatment is completed, filter and dry to obtain modified montmorillonite; among them, the dosage ratio of tributyl phosphate, montmorillonite, and ethanol is 0.4 g: 1 g: 10 mL;

[0161] S12. Mix attapulgite and sodium hydroxide in a mass ratio of 1:0.45 and then perform high-temperature treatment (790 °C, 0.5 h). After the treatment is completed, obtain pre-modified attapulgite;

[0162] S13. Add the modified montmorillonite obtained in step S11 and the pre-modified attapulgite obtained in step S12 to water in sequence, soak for 16 h and then perform stirring treatment (100 rpm, 1 h), and finally filter, dry, and grind and sieve through 150 meshes to obtain material c; among them, the mass ratio of modified montmorillonite, pre-modified attapulgite, and water is 1:2:12;

[0163] S14. Add material c to water, then add sodium dodecyl sulfate and acrylic emulsion, and stir evenly to obtain the primary finishing solution; among them, the mass ratio of material c, water, sodium dodecyl sulfate, and acrylic emulsion is 8:100:2:28.

[0164] Among them, the preparation of the secondary finishing solution includes the following steps:

[0165] S21. Add silicon dioxide to the mixed concentrated acid according to the dosage ratio of 1 g: 8 mL, and treat it at room temperature for 1 h. After the treatment is completed, perform washing treatment to obtain modified silicon dioxide; among them, the mixed concentrated acid is obtained by mixing concentrated sulfuric acid and hydrogen peroxide solution with a volume ratio of 7:3;

[0166] S22. Add chitosan into 0.8 wt% acetic acid solution, stir evenly to obtain a chitosan acetic acid solution with a concentration of 1.5 wt%.

[0167] S23. According to the mass ratio of 0.6:100, add the modified silica obtained in step S21 into the chitosan acetic acid solution obtained in step S22, stir at 30 °C for 4 h. After the treatment is completed, filter, dry, and grind and sieve through 150 meshes to obtain material d.

[0168] S24. Add material d into water, then add sodium dodecyl sulfate and acrylic emulsion, stir evenly to obtain the secondary finishing liquid; wherein, the mass ratio of material d: water: sodium dodecyl sulfate and acrylic emulsion is 4:100:1.5:30.

[0169] Comparative Example 4

[0170] Compared with Example 1, in Comparative Example 4, the modification of silica is not carried out. Specifically: A preparation method of a functional non-woven fabric includes the following steps:

[0171] S1. By weight, mix 100 parts of polypropylene, 9 parts of maleic anhydride grafted polypropylene, 5 parts of rutile titanium dioxide, and 1.2 parts of dodecyl trimethyl ammonium chloride, then feed them into a screw extruder, after melting and plasticizing, and then filtering and removing impurities through 200 meshes, a uniform melt is obtained.

[0172] S2. Successively carry out spinning and web-forming and needling reinforcement treatment (needling density is 400 needles / cm 2 ) on the uniform melt obtained in step S1, and then dry and shape to obtain a non-woven fabric blank.

[0173] S3. Carry out post-treatment on the non-woven fabric blank obtained in step S2 to obtain the functional non-woven fabric.

[0174] Among them, the post-treatment includes: first place the non-woven fabric blank in the primary finishing liquid, soak for 15 min, then press out the excess solution through a calender, and then dry at 110 °C to obtain a pre-finished non-woven fabric;

[0175] Then place the pre-finished non-woven fabric in the secondary finishing liquid, soak for 10 min, then press out the excess solution through a calender, and then dry at 110 °C to obtain the functional non-woven fabric.

[0176] Among them, the preparation of the primary finishing liquid includes the following steps:

[0177] S11. Add tributyl phosphate to ethanol, adjust the pH of the system to 3.8 with acetic acid, then add montmorillonite, and then stir under heating conditions (30 °C, 4 h); after the treatment is completed, filter and dry to obtain modified montmorillonite; among them, the dosage ratio of tributyl phosphate, montmorillonite, and ethanol is 0.4 g: 1 g: 10 mL;

[0178] S12. Mix attapulgite and sodium hydroxide in a mass ratio of 1:0.45 and conduct high-temperature treatment (790 °C, 0.5 h). After the treatment is completed, obtain pre-modified attapulgite;

[0179] S13. Add the pre-modified attapulgite obtained in step S12 to water, disperse evenly, then add potato starch, disperse evenly again, heat up to 95 °C and post-treat for 20 min to obtain a primary reaction product; then add the obtained primary reaction product to water, then add 1.6 mol / L ammonium ferrous sulfate, stir again and conduct a high-temperature reaction (180 °C, 16 h). After the reaction is completed, wash and dry to obtain material a; among them, the dosage ratio of pre-modified attapulgite, water, and potato starch is 1 g: 80 mL: 1.8 g; the dosage ratio of the primary reaction product, water, and ammonium ferrous sulfate is 1 mL: 8 mL: 5 mL;

[0180] S14. Add sodium trimetaphosphate to a 2.5 wt% sodium hydroxide solution, then add material a obtained in step S13, and then conduct heat treatment (35 °C, 2 h). After the treatment is completed, wash and dry to obtain material b; among them, the dosage ratio of sodium trimetaphosphate, sodium hydroxide solution, and material a is 1 g: 90 mL: 2 g;

[0181] S15. Add the modified montmorillonite obtained in step S11 and material b obtained in step S14 to water in sequence, soak for 16 h and then conduct stirring treatment (100 rpm, 1 h), and finally filter, dry, and grind and sieve through 150 meshes to obtain material c; among them, the mass ratio of modified montmorillonite, material b, and water is 1:2:12;

[0182] S16. Add material c to water, then add sodium dodecyl sulfate and acrylic emulsion, and stir evenly to obtain a primary finishing solution; among them, the mass ratio of material c, water, sodium dodecyl sulfate, and acrylic emulsion is 8:100:2:28.

[0183] Among them, the preparation of the secondary finishing solution includes the following steps:

[0184] S21. Take silica for standby;

[0185] S22. Add chitosan to a 0.8 wt% acetic acid solution and stir evenly to obtain a 1.5 wt% chitosan acetic acid solution;

[0186] S23. Add the silica obtained in step S21 to the chitosan acetate solution obtained in step S22 according to a mass ratio of 0.6:100, stir at 30 °C for 4 h. After the treatment is completed, filter, dry, and grind and sieve through 150 meshes to obtain material d.

[0187] S24. Add material d to water, and then add sodium dodecyl sulfate and acrylic emulsion, and stir evenly to obtain the secondary finishing liquid; wherein, the mass ratio of material d: water: sodium dodecyl sulfate and acrylic emulsion is 4:100:1.5:30.

[0188] Perform performance tests on the functional non-woven fabrics prepared in Example 1 and Comparative Examples 1-4, and the method is as follows:

[0189] Flame retardancy test: Refer to GB / T5455-2014 for the test, and measure the damage length and afterflame time of the non-woven fabric 12 s after ignition.

[0190] Antibacterial performance test: Refer to GB / T20944.3-2008 for the test, and record and calculate the antibacterial rate of the non-woven fabric against Escherichia coli (ATCC 11229).

[0191] Tensile strength test: Refer to ASTM D638, and the tensile test rate is 45 mm / min.

[0192] Flame retardancy after washing and antibacterial property after washing test: Wash the non-woven fabrics with the same specifications 40 times with water, and then perform the flame retardancy and antibacterial performance tests again according to the foregoing method to obtain the test data of flame retardancy after washing and antibacterial property after washing respectively.

[0193] The test results are shown in Table 1.

[0194] Table 1 Performance test results

[0195]

[0196] It can be seen that the functional non-woven fabric prepared by the present invention has better flame retardancy, antibacterial property and mechanical properties, and after washing, the flame retardancy and antibacterial property do not show obvious decline, indicating that the flame retardant and antibacterial finishing effects are good and the wash resistance is high.

[0197] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for preparing a functional nonwoven fabric, characterized in that: The steps include: S1. In parts by weight, 80 to 120 parts of polypropylene, 5 to 10 parts of maleic anhydride grafted polypropylene, 3 to 8 parts of rutile titanium dioxide, and 0.5 to 2.5 parts of antistatic agent are mixed and fed into a screw extruder, and after melt plasticization and impurity removal by filtration, a uniform melt is obtained; S2, the uniform melt obtained in step S1 is subjected to spinning and needle punching treatments, and then dried and shaped to obtain a non-woven fabric blank; S3, post-processing the non-woven fabric blank obtained in step S2 to obtain a functional non-woven fabric.

2. The method for preparing a functional nonwoven fabric according to claim 1, characterized in that: In step S1, the melt index of the polypropylene is 20 to 50 g / 10 min, and the antistatic agent is selected from one of dodecyltrimethylammonium chloride and stearic acid; Filter mesh number 150~250 mesh; The melting and plasticizing temperature is 180-240°C.

3. The method for preparing a functional nonwoven fabric according to claim 1, characterized in that: In step S2, the acupuncture density is 300 to 500 needles / cm 2 , the drying temperature is 105℃.

4. The method for preparing a functional nonwoven fabric according to claim 1, characterized in that: In step S3, the post-processing includes: The non-woven fabric blank is first placed in a primary finishing solution and soaked for 15 to 25 minutes, then the excess solution is pressed out by a padder, and then dried at 100 to 120°C to obtain a pre-finished non-woven fabric; Then, the pre-finished nonwoven fabric is placed in the secondary finishing solution and soaked for 10 to 20 minutes. The excess solution is then pressed out by a padder and then dried at 100 to 120°C to obtain the functional nonwoven fabric.

5. The method for preparing a functional nonwoven fabric according to claim 4, characterized in that: The preparation of the primary finishing liquid comprises the following steps: S11, adding tributyl phosphate to ethanol to adjust the pH of the system, then adding montmorillonite, and then stirring under heating conditions; after the treatment is completed, filtering and drying to obtain modified montmorillonite; S12, mixing attapulgite with sodium hydroxide and subjecting the mixture to high temperature treatment, and obtaining pre-modified attapulgite after the treatment is completed; S13, adding the pre-modified attapulgite obtained in step S12 into water, dispersing it evenly, then adding potato starch, dispersing it evenly again, heating it to obtain a primary reaction product; then adding the primary reaction product into water, then adding ammonium ferrous sulfate, stirring it again, and reacting it at high temperature. After the reaction is completed, washing and drying it to obtain material a; S14, adding sodium trimetaphosphate to a sodium hydroxide solution, and then adding the material a obtained in step S13, followed by heating, and after the treatment, washing and drying to obtain material b; S15, adding the modified montmorillonite obtained in step S11 and the material b obtained in step S14 into water in sequence, soaking and stirring, and finally filtering, drying, grinding and sieving to obtain material c; S16, adding material c into water, and then adding sodium lauryl sulfate and acrylic emulsion, stirring evenly to obtain a primary finishing liquid.

6. The method for preparing a functional nonwoven fabric according to claim 5, characterized in that: In step S11, the usage ratio of tributyl phosphate, montmorillonite and ethanol is 0.35-0.5 g: 1 g: 5-10 mL; The pH value of the system was adjusted using acetic acid to a value of 3.5 to 4; The heating temperature is 30-35°C and the stirring treatment time is 2-6h.

7. The method for preparing a functional nonwoven fabric according to claim 5, characterized in that: In step S12, the mass ratio of attapulgite to sodium hydroxide is 1:0.4-0.65; the high temperature treatment temperature is 780-800°C, and the treatment time is 0.5-2h; In step S13, the ratio of pre-modified attapulgite, water and potato starch is 1 g: 60-100 mL: 1.5-2 g; the temperature is raised to 90-95° C., and the post-heating treatment time is 15-25 min; The dosage ratio of the primary reaction product, water and ammonium ferrous sulfate is 1 mL: 4-8 mL: 4-8 mL; the concentration of ammonium ferrous sulfate is 1.5-1.8 mol / L; the high temperature reaction temperature is 170-190° C., and the reaction time is 8-24 hours; In step S14, the dosage ratio of sodium trimetaphosphate, sodium hydroxide solution and material a is 1g:60-100mL:1.5-2.5g; the heating treatment temperature is 30-35°C, and the treatment time is 1-4h; the concentration of the sodium hydroxide solution is 2-3.5wt%.

8. The method for preparing a functional nonwoven fabric according to claim 5, characterized in that: In step S15, the mass ratio of modified montmorillonite, material b, and water is 1:1.5-2:10-15; the soaking time is 12-24 hours; the stirring speed is 80-120 rpm, and the stirring time is 1-4 hours; the grinding and sieving mesh number is 100-150 mesh; In step S16, the mass ratio of material c, water, sodium lauryl sulfate and acrylic emulsion is 6-10:100:1.5-2.5:25-35.

9. The method for preparing a functional nonwoven fabric according to claim 4, characterized in that: The preparation of the secondary finishing solution comprises the following steps: S21. Add silicon dioxide to a mixed concentrated acid at a dosage ratio of 1 g: 5-10 mL, treat at room temperature for 0.5-2.5 h, and wash to obtain modified silicon dioxide; wherein the mixed concentrated acid is obtained by mixing concentrated sulfuric acid and hydrogen peroxide solution in a volume ratio of 7:3; S22, adding chitosan to a 0.5-1 wt% acetic acid solution, stirring evenly, to obtain a chitosan acetic acid solution with a concentration of 1-2 wt%; S23, adding the modified silicon dioxide obtained in step S21 to the chitosan acetic acid solution obtained in step S22 at a mass ratio of 0.5 to 0.8:100, stirring at 30 to 35° C. for 2 to 6 hours, and after the treatment, filtering, drying, grinding and sieving through 100 to 150 meshes to obtain material d; S24. Add material d into water, and then add sodium dodecyl sulfate and acrylic emulsion, stir evenly, and obtain a secondary finishing liquid; wherein the mass ratio of material d: water: sodium dodecyl sulfate and acrylic emulsion is 3-6:100:1.2-2:25-35.

10. A functional nonwoven fabric prepared by the method according to any one of claims 1 to 9.

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