A flame-retardant fabric containing high-performance flame-retardant fibers and a preparation process thereof

Abstract

This invention relates to a flame-retardant fabric containing high-performance flame-retardant fibers and its preparation process, belonging to the field of textile materials technology. The flame-retardant fabric of this invention is woven from pure yarn of modified polyacrylonitrile-based pre-oxidized fibers. The modified polyacrylonitrile-based pre-oxidized fibers are first pretreated by low-temperature plasma, and then sequentially processed with composite zinc ions and loaded cross-linked sericin. The fabric preparation process involves spinning the aforementioned modified polyacrylonitrile-based pre-oxidized fibers into yarn, weaving it into a greige fabric, immersing it in a bio-based finishing solution, and then pre-drying, baking for fixation, washing, and setting to obtain the flame-retardant fabric. The fabric obtained by this invention possesses high flame retardancy, abrasion resistance, excellent washability, good breathability and comfort, and environmental friendliness.

Description

Technical Field

[0001] This invention belongs to the field of textile materials technology, and relates to a flame-retardant fabric containing high-performance flame-retardant fibers and its preparation process. Background Technology

[0002] Flame-retardant fabrics are key materials for special protective clothing, home furnishings, and industrial textiles. Their core technology lies in how to efficiently and persistently inhibit or delay the spread of flames, while simultaneously ensuring wearing comfort, mechanical strength, abrasion resistance, and environmental friendliness. Currently, flame retardancy in fabrics is achieved primarily through two approaches: one is to perform flame-retardant finishing on conventional fiber fabrics, and the other is to directly use inherently flame-retardant fibers during the spinning and weaving stage. While finishing processes such as padding and coating are flexible and relatively low-cost, their flame-retardant effects are usually not resistant to washing and friction, resulting in poor durability. Furthermore, the extensive use of halogen-based and phosphorus-nitrogen-based flame-retardant finishing agents can affect the fabric's feel and breathability, and may also impair its abrasion resistance due to weak adhesion to the substrate. On the other hand, while directly using high-performance inherently flame-retardant fibers can provide permanent and reliable flame-retardant performance, it faces challenges such as high raw material costs, dyeing difficulties, a stiffer fabric feel, and room for improvement in abrasion resistance under long-term friction conditions, limiting its widespread adoption.

[0003] Therefore, there is an urgent need for a flame-retardant fabric and its preparation process that can maintain excellent flame retardancy, durability and comfort while also having good abrasion resistance. Summary of the Invention

[0004] The purpose of this invention is to provide a flame-retardant fabric containing high-performance flame-retardant fibers and its preparation process, which has excellent flame retardancy and abrasion resistance.

[0005] The objective of this invention can be achieved through the following technical solutions: A flame-retardant fabric containing high-performance flame-retardant fibers, said flame-retardant fabric being woven from pure yarn of modified polyacrylonitrile-based pre-oxidized fibers. The method for preparing the modified polyacrylonitrile-based pre-oxidized fiber is as follows. S1-1: Low-temperature plasma treatment of polyacrylonitrile-based pre-oxidized fibers is carried out for 30~180 s and the pressure is 50~100 Pa to obtain pre-treated polyacrylonitrile-based pre-oxidized fibers. S1-2: Add the pretreated polyacrylonitrile-based pre-oxidized fiber to an aqueous solution containing zinc salt at a bath ratio of 1:(20~30), sonicate at 40~60 ℃ for 20~60 min, and then drain. S1-3: Add the polyacrylonitrile-based pre-oxidized fiber obtained in S1-2 to an aqueous solution containing sericin at a bath ratio of 1:(30~50), stir at 50~60 ℃ for 10~30 min, adjust the pH to 5~6 using hydrochloric acid or sodium hydroxide, add genipin, continue stirring for 1~2 h, remove the fiber, wash with deionized water and dry to obtain the modified polyacrylonitrile-based pre-oxidized fiber.

[0006] As a preferred embodiment of the present invention, the flame-retardant fabric is obtained by blending and weaving 30-45 parts by weight of aramid fiber, 25-40 parts by weight of modified polyacrylonitrile-based pre-oxidized fiber and 15-25 parts by weight of polyimide fiber.

[0007] As a preferred embodiment of the present invention, the low-temperature plasma treatment in S1-1 is carried out in an air atmosphere, and the treatment power is 100~300 W.

[0008] As a preferred embodiment of the present invention, the zinc salt in S1-2 is one or more of zinc chloride, zinc sulfate and zinc nitrate, and the concentration of zinc ions in the aqueous solution is 0.05~0.2 mol / L.

[0009] As a preferred embodiment of the present invention, the concentration of sericin in the aqueous solution of S1-3 is 5~10wt%.

[0010] As a preferred embodiment of the present invention, the amount of genipin added in S1-3 is 2-6% of the sericin protein content.

[0011] As a preferred embodiment of the present invention, the stirring speed in S1-3 is 150~300 rpm.

[0012] A process for preparing a flame-retardant fabric containing high-performance flame-retardant fibers, the process comprising the following steps: The modified polyacrylonitrile-based pre-oxidized fiber is spun purely or blended with other fibers to form yarn. The flame-retardant yarn is woven into a greige fabric using a loom. The greige fabric is then immersed in a bio-based finishing solution for 20-30 minutes. The immersed fabric is pre-dried at 80-90°C for 3-5 minutes, followed by drying at 120-135°C. Finally, it is washed and shaped to obtain the flame-retardant fabric.

[0013] As a preferred technical solution of the present invention, the formulation of the bio-based finishing liquid is as follows: by weight, 3-5 parts modified halloysite nanotubes, 2-3 parts chitosan, 1-2 parts nano silica, 1-2 parts malic acid, and 50-60 parts deionized water. The preparation method of modified halloysite nanotubes is as follows: S9-1: Add halloysite nanotubes to deionized water, sonicate for 30-60 min, wash with deionized water and dry to obtain pretreated halloysite nanotubes. S9-2: The pretreated halloysite nanotubes and a 5-10 wt% phytic acid solution were mixed at a mass ratio of 1:(10-20), the pH was adjusted to 4-5, and the mixture was stirred at 60-80℃ for 4-6 h. The mixture was then washed with deionized water and dried to obtain the modified halloysite nanotubes.

[0014] As a preferred embodiment of the present invention, the liquid rolling rate during the impregnation process is 70-80%.

[0015] Low-temperature plasma treatment can effectively etch the surface of polyacrylonitrile-based pre-oxidized fibers, forming numerous micropores and grooves, significantly increasing the fiber surface roughness and specific surface area. Simultaneously, the introduction of oxygen-containing polar groups further enhances the fiber's surface energy. This not only facilitates the subsequent adsorption of zinc salts and sericin, but also improves the friction and adhesion between the fiber and other materials, enhancing yarn cohesion during fabric weaving and improving fabric strength and abrasion resistance.

[0016] In the preparation of modified polyacrylonitrile-based pre-oxidized fibers, the fibers are first treated with an aqueous solution containing zinc salts, causing zinc ions to adsorb onto the fiber surface. Subsequently, the fibers react with sericin and are cross-linked with genipin to form a composite structure on the fiber surface. During combustion, zinc promotes the formation of a dense carbon layer on the fiber surface. This carbon layer effectively isolates heat transfer and oxygen supply, preventing further flame spread. Simultaneously, the non-flammable gases produced by the decomposition of sericin dilute the concentration of surrounding oxygen and combustible gases, and the resulting carbides further enhance the stability of the carbon layer, thereby improving the flame retardant properties of the fiber. The synergistic effect of these two factors significantly enhances the flame retardant performance of the fiber.

[0017] Because low-temperature plasma treatment generates numerous active sites on the fiber surface, and the cross-linking effect of genipin firmly binds sericin to the fiber surface, the zinc-sericein composite structure is less likely to detach during washing. Compared to fibers that acquire flame retardancy solely through physical adsorption, the modified polyacrylonitrile-based pre-oxidized fiber of this invention exhibits a more durable flame retardant effect, meeting the needs of long-term use and repeated washing.

[0018] Furthermore, zinc ions possess antibacterial activity. After forming a zinc-containing structure on the fiber surface, modified polyacrylonitrile-based pre-oxidized fibers acquire antibacterial properties, inhibiting the growth and reproduction of common bacteria and reducing odors and infection risks caused by bacterial proliferation. Polyacrylonitrile-based pre-oxidized fibers are inherently prone to static electricity. However, after modification, the altered surface properties and potential conductive pathways help reduce the generation and accumulation of static electricity, improving the fabric's antistatic properties and preventing issues such as dust adsorption and electric shocks during wear or use. Simultaneously, sericin has excellent biocompatibility and hygroscopicity. Introducing it onto the surface of polyacrylonitrile-based pre-oxidized fibers improves the fiber's hydrophilicity, giving the fabric better moisture absorption and breathability, thus enhancing wearing comfort.

[0019] The prepared fabric was impregnated with a bio-based finishing solution. Phytic acid-modified halloysite nanotubes, with chemically bonded phytic acid on their surface, efficiently catalyzes the dehydration and cross-linking of the fiber matrix and chitosan upon heating. Simultaneously, the decomposition of chitosan produces non-combustible gases. These two processes synergistically form a denser and more uniform expanded carbon layer. Secondly, the hollow tubular structure of the halloysite nanotubes has a high aspect ratio, effectively transferring and dispersing stress within the coating. Acting as nano-reinforcing steel, it significantly enhances the coating's hardness, tensile strength, and scratch resistance. Therefore, the unique tubular structure of the nanotubes, together with nano-silica, forms a composite framework in the carbon layer. This not only greatly improves the mechanical strength, continuity, and thermal stability of the carbon layer, preventing cracking and collapse, but its tubular cavity also effectively blocks heat flow and the diffusion of combustible gases, thus providing long-lasting insulation. Thirdly, the phosphorus- and nitrogen-containing active fragments produced by the decomposition of phytic acid and chitosan can capture free radicals in the gas phase, inhibiting flame propagation. In addition, malic acid, as a crosslinking agent, can not only bond the finishing agent network to the fiber surface, but also anchor the entire network more firmly through the abundant phytic acid sites on the surface of halloysite nanotubes, thereby giving the fabric excellent washability and achieving a synergistic improvement in flame retardancy, abrasion resistance and durability.

[0020] In this invention, aramid fiber serves as the core of high strength and high modulus, providing the fabric's skeleton to resist tearing and mechanical damage, and contributing stable intrinsic flame retardancy. Polyimide fiber offers excellent high-temperature resistance and a soft touch, compensating for the relatively stiff feel of aramid, providing protection for the fabric in extremely high-temperature environments, and improving wearing comfort. The metal-sericin composite layer on the surface of the modified polyacrylonitrile-based pre-oxidized fiber can form a char layer as a heat insulation barrier when exposed to fire; at the same time, because its cost is lower than that of aramid and polyimide, it effectively reduces the overall cost of the fabric without sacrificing performance. The bio-based finishing liquid can penetrate and cover the interlacing points and gaps between fibers, forming a continuous intumescent flame-retardant film on the entire fabric surface and at the interlacing points, further improving the fabric's flame-retardant properties.

[0021] The beneficial effects of this invention are: This invention modifies the surface of polyacrylonitrile-based pre-oxidized fibers through low-temperature plasma activation, zinc ion chelation, and sericin crosslinking, constructing a stable composite layer on its surface. Upon exposure to fire, zinc ions efficiently catalyze char formation, while sericin decomposes synergistically to form a dense and stable expanded char layer, isolating heat and mass transfer, thereby transforming the polyacrylonitrile-based pre-oxidized fibers into a highly efficient and durable bulk flame-retardant material. Furthermore, a bio-based finishing liquid is used for post-treatment. This finishing liquid acts as both a highly efficient nano-reinforcing agent and a flame-retardant synergist, forming an environmentally friendly expanded flame-retardant film with stronger coverage and superior mechanical properties on the fabric layer. This synergistic effect with the fiber's own flame-retardant mechanism further enhances overall abrasion resistance, flame-retardant uniformity, durability, and char layer strength. The final product possesses highly efficient flame retardancy, abrasion resistance, washability, comfort, breathability, and environmental friendliness. Detailed Implementation

[0022] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with embodiments, is provided below.

[0023] It should be noted that, unless otherwise specified, the present invention does not specifically limit the source of the raw materials used in the following embodiments. Commercially available products or products prepared by conventional preparation methods that are well known to those skilled in the art can be used. Experimental methods that do not specify specific conditions are all conventional methods and conventional conditions well known in the art. Example 1

[0024] A flame-retardant fabric containing high-performance flame-retardant fibers, wherein the flame-retardant fabric is obtained by blending and weaving 38 parts by weight of para-aramid fiber, 30 parts by weight of modified polyacrylonitrile-based pre-oxidized fiber, and 20 parts by weight of polyimide fiber. The modified polyacrylonitrile-based pre-oxidized fiber is obtained by first pre-treating with low-temperature plasma, and then sequentially passing it through composite zinc ions and loaded cross-linked sericin.

[0025] The method for preparing the modified polyacrylonitrile-based pre-oxidized fiber is as follows. S2-1: Low-temperature plasma treatment was performed on polyacrylonitrile-based pre-oxidized fibers. The plasma treatment power was 200W, the treatment time was 90s, and the pressure was 75Pa. The low-temperature plasma treatment was carried out in an air atmosphere to obtain pre-treated polyacrylonitrile-based pre-oxidized fibers. S2-2: Add the pretreated polyacrylonitrile-based pre-oxidized fiber to a 0.1 mol / L zinc chloride aqueous solution at a bath ratio of 1:25, sonicate at 50 ℃ for 40 min, and then drain. S2-3: The polyacrylonitrile-based pre-oxidized fiber obtained in S2-2 was added to an aqueous solution containing sericin, with a sericin concentration of 8 wt% and a bath ratio of 1:40. The mixture was stirred at 55 °C for 20 min, and the pH was adjusted to 5.5 using hydrochloric acid or sodium hydroxide. Genipin was added at 4% of the sericin protein content. The mixture was stirred for another 1.5 h at a stirring speed of 250 rpm. The fiber was then removed, washed with deionized water, and dried to obtain the modified polyacrylonitrile-based pre-oxidized fiber.

[0026] A process for preparing a flame-retardant fabric containing high-performance flame-retardant fibers, the process comprising the following steps: Para-aramid fiber, modified polyacrylonitrile-based pre-oxidized fiber and polyimide fiber are blended to form yarn. The flame-retardant yarn is woven into a greige fabric on a loom. The greige fabric is then immersed in a bio-based finishing solution for 25 minutes with a immersion rate of 75%. The immersed fabric is pre-dried at 85 °C for 4 minutes, then dried at 125 °C, and finally washed and shaped to obtain the flame-retardant fabric.

[0027] The formula of the bio-based finishing solution is as follows, calculated by weight: 4 parts modified halloysite nanotubes, 2.5 parts chitosan, 1.5 parts nano silica, 1.5 parts malic acid, and 55 parts deionized water. The preparation method of modified halloysite nanotubes is as follows: S9-1: Add halloysite nanotubes to deionized water, sonicate for 45 min, wash with deionized water and dry to obtain pretreated halloysite nanotubes. S9-2: The pretreated halloysite nanotubes and a 7.5 wt% phytic acid solution were mixed at a mass ratio of 1:15, the pH was adjusted to 4.5, and the mixture was stirred at 70°C for 5 h. The mixture was then washed with deionized water and dried to obtain the modified halloysite nanotubes. Example 2

[0028] A flame-retardant fabric containing high-performance flame-retardant fibers, wherein the flame-retardant fabric is obtained by blending and weaving 30 parts by weight of para-aramid fiber, 25 parts by weight of modified polyacrylonitrile-based pre-oxidized fiber, and 15 parts by weight of polyimide fiber. The modified polyacrylonitrile-based pre-oxidized fiber is obtained by first pre-treating with low-temperature plasma, and then sequentially passing it through composite zinc ions and loaded cross-linked sericin.

[0029] The method for preparing the modified polyacrylonitrile-based pre-oxidized fiber is as follows. S2-1: Low-temperature plasma treatment was performed on polyacrylonitrile-based pre-oxidized fibers for 30 seconds at a pressure of 50 Pa in an air atmosphere with a power of 100 W to obtain pre-treated polyacrylonitrile-based pre-oxidized fibers. S2-2: Add the pretreated polyacrylonitrile-based pre-oxidized fiber to a 0.05 mol / L zinc nitrate aqueous solution at a bath ratio of 1:20, sonicate at 40 ℃ for 20 min, and then drain. S2-3: The polyacrylonitrile-based pre-oxidized fiber obtained in S2-2 was added to an aqueous solution containing sericin, the concentration of sericin in the aqueous solution was 5 wt%, the bath ratio was 1:30, and the mixture was stirred at 50 ℃ for 10 min. The pH was adjusted to 5 using hydrochloric acid or sodium hydroxide, and genipin was added at 2% of the sericin protein mass. The mixture was stirred for another 1 h at a stirring speed of 150 rpm. The fiber was then removed, washed with deionized water, and dried to obtain the modified polyacrylonitrile-based pre-oxidized fiber.

[0030] A process for preparing a flame-retardant fabric containing high-performance flame-retardant fibers, the process comprising the following steps: Para-aramid fiber, modified polyacrylonitrile-based pre-oxidized fiber and polyimide fiber are blended to form yarn. The flame-retardant yarn is woven into a greige fabric by a loom. The greige fabric is immersed in a bio-based finishing solution for 20 min with a immersion rate of 70%. The immersed fabric is pre-dried at 80 °C for 3 min, then dried at 120 °C, and then washed and shaped to obtain the flame-retardant fabric.

[0031] The formula of the bio-based finishing solution is as follows, by weight: 3 parts phytic acid, 2 parts chitosan, 1 part nano silica, 1 part malic acid, and 50 parts deionized water. The preparation method of modified halloysite nanotubes is as follows: S9-1: Add halloysite nanotubes to deionized water, sonicate for 30 min, wash with deionized water and dry to obtain pretreated halloysite nanotubes. S9-2: The pretreated halloysite nanotubes and a 5 wt% phytic acid solution were mixed at a mass ratio of 1:10, the pH was adjusted to 4, and the mixture was stirred at 60°C for 4 h. The mixture was then washed with deionized water and dried to obtain the modified halloysite nanotubes. Example 3

[0032] A flame-retardant fabric containing high-performance flame-retardant fibers, wherein the flame-retardant fabric is obtained by blending and weaving 45 parts by weight of para-aramid fiber, 40 parts by weight of modified polyacrylonitrile-based pre-oxidized fiber and 25 parts by weight of polyimide fiber. The modified polyacrylonitrile-based pre-oxidized fiber is obtained by first pre-treating with low-temperature plasma, and then sequentially passing it through composite zinc ions and loaded cross-linked sericin.

[0033] The method for preparing the modified polyacrylonitrile-based pre-oxidized fiber is as follows. S2-1: Low-temperature plasma treatment was performed on polyacrylonitrile-based pre-oxidized fibers for 180 s at a pressure of 100 Pa in an air atmosphere with a power of 300 W to obtain pre-treated polyacrylonitrile-based pre-oxidized fibers. S2-2: Add the pretreated polyacrylonitrile-based pre-oxidized fiber to a 0.2 mol / L zinc sulfate aqueous solution at a bath ratio of 1:30, sonicate at 60 ℃ for 60 min, and then drain. S2-3: The polyacrylonitrile-based pre-oxidized fiber obtained in S2-2 was added to an aqueous solution containing sericin, the concentration of sericin in the aqueous solution was 10 wt%, the bath ratio was 1:50, and the mixture was stirred at 60 ℃ for 30 min. The pH was adjusted to 6 using hydrochloric acid or sodium hydroxide, and genipin was added at 6% of the sericin protein mass. The mixture was stirred for another 2 h at a stirring speed of 300 rpm. The fiber was then removed, washed with deionized water, and dried to obtain the modified polyacrylonitrile-based pre-oxidized fiber.

[0034] A process for preparing a flame-retardant fabric containing high-performance flame-retardant fibers, the process comprising the following steps: Para-aramid fiber, modified polyacrylonitrile-based pre-oxidized fiber and polyimide fiber are blended to form yarn. The flame-retardant yarn is woven into a greige fabric by a loom. The greige fabric is immersed in a bio-based finishing solution for 30 min with a immersion rate of 80%. The immersed fabric is pre-dried at 90 °C for 5 min, then dried at 135 °C, and then washed and shaped to obtain the flame-retardant fabric.

[0035] The formula of the bio-based finishing solution is as follows, by weight: 5 parts modified halloysite nanotubes, 3 parts chitosan, 2 parts nano silica, 2 parts malic acid, and 60 parts deionized water. The preparation method of modified halloysite nanotubes is as follows: S9-1: Add halloysite nanotubes to deionized water, sonicate for 60 min, wash with deionized water and dry to obtain pretreated halloysite nanotubes. S9-2: The pretreated halloysite nanotubes and a 10 wt% phytic acid solution were mixed at a mass ratio of 1:20, the pH was adjusted to 5, and the mixture was stirred at 80°C for 6 h. The mixture was then washed with deionized water and dried to obtain the modified halloysite nanotubes. Example 4

[0036] The difference between this embodiment and Embodiment 1 is that the flame-retardant fabric is woven from pure yarn of modified polyacrylonitrile-based pre-oxidized fiber, while the rest is the same as in Embodiment 1.

[0037] Comparative Example 1 The difference between this comparative example and Example 1 is that no zinc salt is added in the preparation of the modified polyacrylonitrile-based pre-oxidized fiber; otherwise, they are the same as in Example 1.

[0038] Comparative Example 2 The difference between this comparative example and Example 1 is that no sericin was added in the preparation of the modified polyacrylonitrile-based pre-oxidized fiber; otherwise, they are the same as in Example 1.

[0039] Comparative Example 3 The difference between this comparative example and Example 1 is that unmodified polyacrylonitrile-based pre-oxidized fiber is used instead of modified polyacrylonitrile-based pre-oxidized fiber; otherwise, they are the same as in Example 1.

[0040] Comparative Example 4 The difference between this comparative example and Example 1 is that the fabric in the preparation of the flame-retardant fabric is not impregnated with a bio-based finishing solution, while the rest is the same as in Example 1.

[0041] Comparative Example 5 The difference between this comparative example and Example 1 is that an equal amount of unmodified halloysite nanotubes were used instead of modified halloysite nanotubes in the bio-based finishing solution; otherwise, they are the same as in Example 1.

[0042] Comparative Example 6 The difference between this comparative example and Example 1 is that no nano-silica is added to the bio-based finishing solution; otherwise, they are the same as in Example 1.

[0043] Flame retardant performance test The flame-retardant fabrics prepared according to the embodiments and comparative examples of the present invention were tested for flame retardant performance according to the method in GA10-2014. The specific experimental results are recorded in the table below.

[0044] Abrasion resistance test The flame-retardant fabrics prepared in Example 1 and Comparative Examples 4-6 of this invention were subjected to abrasion resistance tests according to the national standard GB / T 21196.2-2007. The number of rubbings when the fabric was damaged was recorded. The specific experimental results are recorded in the table below.

[0045] Data from the examples and comparative examples show that the fabric prepared by the present invention has excellent flame retardant and abrasion resistance properties.

[0046] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention are still within the scope of the present invention.

Claims

1. A flame-retardant fabric containing high-performance flame-retardant fibers, characterized in that, The flame-retardant fabric is woven from pure yarn of modified polyacrylonitrile-based pre-oxidized fiber. The method for preparing the modified polyacrylonitrile-based pre-oxidized fiber is as follows. S1-1: Low-temperature plasma treatment of polyacrylonitrile-based pre-oxidized fibers is carried out for 30~180 s and the pressure is 50~100 Pa to obtain pre-treated polyacrylonitrile-based pre-oxidized fibers. S1-2: Add the pretreated polyacrylonitrile-based pre-oxidized fiber to an aqueous solution containing zinc salt at a bath ratio of 1:(20~30), sonicate at 40~60 ℃ for 20~60 min, and then drain. S1-3: Add the polyacrylonitrile-based pre-oxidized fiber obtained in S1-2 to an aqueous solution containing sericin at a bath ratio of 1:(30~50), stir at 50~60 ℃ for 10~30 min, adjust the pH to 5~6 using hydrochloric acid or sodium hydroxide, add genipin, continue stirring for 1~2 h, remove the fiber, wash with deionized water and dry to obtain the modified polyacrylonitrile-based pre-oxidized fiber.

2. The flame-retardant fabric containing high-performance flame-retardant fibers according to claim 1, characterized in that, The flame-retardant fabric is obtained by blending and weaving 30-45 parts by weight of aramid fiber, 25-40 parts by weight of modified polyacrylonitrile-based pre-oxidized fiber and 15-25 parts by weight of polyimide fiber.

3. The flame-retardant fabric containing high-performance flame-retardant fibers according to claim 1, characterized in that, The low-temperature plasma treatment in S1-1 is carried out in an air atmosphere, with a processing power of 100~300 W.

4. The flame-retardant fabric containing high-performance flame-retardant fibers according to claim 1, characterized in that, The zinc salt in S1-2 is one or more of zinc chloride, zinc sulfate, and zinc nitrate, and the concentration of zinc ions in the aqueous solution is 0.05~0.2 mol / L.

5. A flame-retardant fabric containing high-performance flame-retardant fibers according to claim 1, characterized in that, The concentration of sericin in the aqueous solution of S1-3 is 5~10 wt%.

6. The flame-retardant fabric containing high-performance flame-retardant fibers according to claim 1, characterized in that, The amount of genipin added in S1-3 is 2-6% of the sericin protein content.

7. The flame-retardant fabric containing high-performance flame-retardant fibers according to claim 1, characterized in that, The stirring speed in S1-3 is 150~300 rpm.

8. A process for preparing a flame-retardant fabric containing high-performance flame-retardant fibers as described in any one of claims 1 to 7, characterized in that, The preparation process includes the following steps. The modified polyacrylonitrile-based pre-oxidized fiber is spun purely or blended with other fibers to form yarn. The flame-retardant yarn is woven into a greige fabric using a loom. The greige fabric is then immersed in a bio-based finishing solution for 20-30 minutes. The immersed fabric is pre-dried at 80-90°C for 3-5 minutes, followed by drying at 120-135°C. Finally, it is washed and shaped to obtain the flame-retardant fabric.

9. The preparation process of a flame-retardant fabric containing high-performance flame-retardant fibers according to claim 8, characterized in that, The formula of the bio-based finishing solution is as follows, by weight: 3-5 parts modified halloysite nanotubes, 2-3 parts chitosan, 1-2 parts nano silica, 1-2 parts malic acid, and 50-60 parts deionized water. The preparation method of modified halloysite nanotubes is as follows: S9-1: Add halloysite nanotubes to deionized water, sonicate for 30-60 min, wash with deionized water and dry to obtain pretreated halloysite nanotubes. S9-2: The pretreated halloysite nanotubes and a 5-10 wt% phytic acid solution were mixed at a mass ratio of 1:(10-20), the pH was adjusted to 4-5, and the mixture was stirred at 60-80℃ for 4-6 h. The mixture was then washed with deionized water and dried to obtain the modified halloysite nanotubes.

10. The preparation process of a flame-retardant fabric containing high-performance flame-retardant fibers according to claim 8, characterized in that, The liquid extraction rate during the impregnation process is 70-80%.

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