Long-acting stable functional material, preparation method thereof and application thereof in far-infrared antibacterial polyacrylonitrile fibers

Abstract

The application relates to the technical field of polyacrylonitrile fiber preparation, and discloses a long-acting stable functional material, a preparation method thereof and application of the long-acting stable functional material in far-infrared antibacterial polyacrylonitrile fiber. The long-acting stable functional material comprises natural extracts, multi-functional group powders and a functional modifier. The long-acting stable functional material can be used in the preparation of far-infrared antibacterial polyacrylonitrile fiber, and the preparation method is as follows: the long-acting stable functional material is added into polyacrylonitrile spinning stock solution, fully stirred and uniformly distributed, and then far-infrared antibacterial polyacrylonitrile fiber is obtained through wet spinning. The application can prepare polyacrylonitrile fiber with high functional added value (antibacterial, heating, far-infrared and antistatic), and expand the application prospect of functional polyacrylonitrile fiber in the textile field.

Description

Technical Field

[0001] This invention relates to the field of polyacrylonitrile fiber preparation technology, specifically to a long-lasting stable functional material, its preparation method, and its application in far-infrared antibacterial polyacrylonitrile fibers. Background Technology

[0002] Polyacrylonitrile (PAC) fiber, also known as artificial wool, boasts advantages such as softness, fluffiness, and ease of dyeing. However, with the upgrading of consumer preferences, the existing functions of PAC cannot meet market demands, making its modification to enhance functionality a research hotspot for textile workers. Adding functional powders such as titanium dioxide (with UV protection, antioxidant, antibacterial, and far-infrared properties), zinc oxide (with antibacterial properties), ceramic powder (with far-infrared, antibacterial, and antioxidant properties), zeolite (with deodorizing and antibacterial properties), calcium carbonate (with antibacterial properties), and calcium oxide (with antibacterial properties) is one direction for improving the functionality of PAC fiber.

[0003] Patent CN 2017107109916 discloses an antibacterial acrylic fiber and its preparation method. The method employs a finishing process to bond an organic antibacterial agent to the acrylic fiber via ionic and / or hydrogen bonds, resulting in an antibacterial acrylic fiber with excellent antibacterial properties. This fiber has wide applications in pure spun yarns, blended yarns, knitted fabrics, and nonwoven fabrics.

[0004] Patent CN 2022100437323 discloses a rare earth antibacterial acrylic fiber and its preparation method. It employs a blending addition method and a wet spinning process using dimethylacetamide as a solvent. Through a suitable dispersion system and sand milling process, rare earth antibacterial powder is prepared into a nano-rare earth antibacterial suspension. The rare earth suspension has good compatibility with the acrylic fiber system, resulting in acrylic fibers with strong antibacterial ability, high efficiency and long-lasting effect, and is non-toxic and non-irritating.

[0005] While adding functional modifiers to fibers can enhance their functionality, it also leads to reduced fiber strength, increased spinning difficulty, and problems with the fiber's durability and stability. Therefore, developing a functional material that can remain stable and long-lasting during the polyacrylonitrile spinning process is essential to meet the growing consumer demand for apparel. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a long-lasting and stable functional material, its preparation method, and its application in far-infrared antibacterial polyacrylonitrile fiber.

[0007] To achieve the above objectives, the technical solution of the present invention is: a long-lasting and stable functional material, comprising natural extracts, multifunctional powders, and functional modifiers.

[0008] Furthermore, the natural extract is selected from one or more of sorbic acid, chitosan, lignin, gelatin, lecithin, sodium alginate, and maltodextrin.

[0009] Preferably, the natural extract is chitosan.

[0010] Furthermore, the degree of deacetylation of the chitosan is 85%–99%.

[0011] Furthermore, the multifunctional powder is selected from one or more of the following: modified zeolite, zirconium phosphate, diatomaceous earth, silica gel, activated carbon, calcium phosphate, and calcium oxide.

[0012] Preferably, the multifunctional powder is a modified zeolite.

[0013] Furthermore, the preparation method of the modified zeolite is as follows:

[0014] S1: After washing the zeolite with deionized water, calcine it at 300-400℃ for 2-4 hours, cool it to room temperature, and then grind it with a ball mill to obtain zeolite powder.

[0015] S2: Then, the zeolite powder is placed in anhydrous ethanol, stirred evenly, and then the modification solution is added. After reacting for 10 hours under argon at 60℃, it is washed and dried with anhydrous ethanol to obtain the modified zeolite.

[0016] Further; the mass-to-volume ratio of zeolite powder to anhydrous ethanol in step S2 is (1-5) g:(20-100) mL, preferably 1 g:20 mL.

[0017] Further: the amount of modified solution added in step S2 is 3%-8% of the volume of anhydrous ethanol, preferably 5%.

[0018] Further: The modified solution in step S2 is obtained by mixing anhydrous ethanol, silicon-containing organic compound and water in a volume ratio of (5-10):(2-6):(1-3) and stirring until homogeneous, preferably in a volume ratio of 7:4:2.

[0019] Further, the silicon-containing organic compound is selected from one or more of 3-aminopropyltriethoxysilane, 3-aminopropyltrimethoxysilane, N-(2-aminoethyl)-3-aminopropylmethyldimethoxysilane, diethylenetriaminopropyltrimethoxysilane, 3-isocyanatepropyltriethoxysilane, isobutyltriethoxysilane, and vinyltriethoxysilane.

[0020] Furthermore, the silicon-containing organic compound is 3-aminopropyltriethoxysilane or 3-aminopropyltrimethoxysilane.

[0021] Furthermore, the functional modifier is selected from one or more of the following: titanium dioxide, zinc sulfate, cadmium oxide, silver sulfonate, iron phthalocyanine, zinc oxide, tin dioxide, metal oxide coordinated amino organosilicon, undecynedioxanol, zinc coordination compound, iron coordination compound, iodine coordination compound, silver coordination compound, and copper coordination compound.

[0022] Preferably, the functional modifier comprises titanium dioxide and zinc oxide, wherein the mass ratio of titanium dioxide to zinc oxide is (1-5):(2-8), preferably 1:3.

[0023] A method for preparing the aforementioned long-lasting stable functional material includes the following steps:

[0024] A: Add modified zeolite to the functional modifier aqueous solution, stir evenly, and slowly add alkaline aqueous solution dropwise while stirring to adjust the pH to 7. After filtration and drying, calcine at 100℃ for 2-3 hours, and cool to room temperature to obtain functional modified zeolite powder.

[0025] B: Immerse the functional modified zeolite powder in deionized water, then remove and drain for later use.

[0026] C: Add chitosan to a 2wt% acetic acid solution and stir until fully dissolved. Then add the functional modified zeolite powder drained in step (2) and add 5wt% glutaraldehyde solution while stirring. Stir at room temperature for 2-3 hours, wash and dry to obtain the long-lasting stable functional material.

[0027] Further; the mass ratio of the functional modifier to water in the aqueous solution of the functional modifier in step A is 1:(5-10); preferably 1:8.

[0028] Further; the mass ratio of the functional modifier aqueous solution to the modified zeolite in step A is 1:(1-5), preferably 1:2.

[0029] Furthermore, the alkaline aqueous solution described in step A is a saturated sodium bicarbonate solution.

[0030] Further; the mass-to-volume ratio of the functional modified zeolite powder to deionized water in step B is (1-5) g:(10-20) mL, preferably 1 g:10 mL.

[0031] Furthermore, the soaking time in step B is 2 to 6 hours, preferably 4 hours.

[0032] Further; the mass-to-volume ratio of chitosan to 2wt% acetic acid solution in step C is (1-5) g : (20-80) mL, preferably 1 g : 50 mL.

[0033] Further; the mass ratio of chitosan to drained functional modified zeolite powder in step C is (1-5):(1-20), preferably 2:15.

[0034] Further, the mass-to-volume ratio of the polysaccharide to the 5wt% glutaraldehyde solution in step C is 2g:(3-5)mL, preferably 2g:4mL.

[0035] The application of the long-lasting stable functional material in far-infrared antibacterial polyacrylonitrile fiber, the preparation method of the far-infrared antibacterial polyacrylonitrile fiber is as follows: the long-lasting stable functional material is added to the polyacrylonitrile spinning solution, stirred thoroughly and evenly, and then wet-spun to obtain far-infrared antibacterial polyacrylonitrile fiber.

[0036] Furthermore, the mass ratio of the long-lasting stable functional material to the polyacrylonitrile spinning solution is (0.5-30):100.

[0037] Furthermore, the preparation method of the polyacrylonitrile spinning solution is as follows: polyacrylonitrile is dissolved in dimethylacetamide, and after stirring and dissolving, the polyacrylonitrile spinning solution is obtained. The dimethylacetamide accounts for 60% to 90% of the mass of the polyacrylonitrile spinning solution, preferably 80%.

[0038] The beneficial effects of this invention are:

[0039] (1) The far-infrared antibacterial polyacrylonitrile fiber prepared by the present invention, with the addition of a long-lasting stable composite material, maximizes the functional added value of polyacrylonitrile fiber without damaging the stable system of polyacrylonitrile spinning solution, and expands the application prospects of functional acrylic fiber in the textile field.

[0040] (2) The far-infrared antibacterial polyacrylonitrile fiber prepared by this invention has good antibacterial effect. According to GB / T20944.3-2008, the antibacterial rate against Staphylococcus aureus is ≥97%, the antibacterial rate against Escherichia coli is ≥97%, and the antibacterial rate against Candida albicans is ≥86%, which meets the requirements of the national standard for AAA-grade antibacterial textiles;

[0041] (3) The far-infrared antibacterial polyacrylonitrile fiber prepared by this invention has antistatic, far-infrared, and moisture-absorbing heat-generating effects. Antistatic testing according to GB / T 12703.1-2021 shows that the optimal static voltage half-life of the fabric is 0.028s; far-infrared testing according to GB / T30127-2013 shows that the far-infrared emissivity of the fabric is ≥0.9 and the far-infrared radiation temperature rise value is ≥1.6; moisture-absorbing heat-generating testing according to FZ / T73036-2020 shows that the maximum temperature rise value of the fabric is ≥6.6.

[0042] (4) The modified zeolite prepared by this invention has a uniform particle size distribution with an average particle size of 50-100 nm and almost no agglomeration. The active groups on the surface of the modified zeolite interact with the chitosan in the composite material to form a dense network structure. On the other hand, it enhances the loading rate of the functional modifier on the zeolite. The loading rate is >95% (according to GB / T 20944.3-2008, the antibacterial rate of fiber products against three bacteria (Staphylococcus aureus, Escherichia coli, and Candida albicans) is tested. If it meets the AAA grade judgment in the standard, it is considered that the loading rate of the functional modifier on the zeolite is >95%, and the loss rate of multifunctional powder and functional modifier is less than 1%).

[0043] (5) Chitosan is the most commonly used natural antibacterial agent with good biocompatibility, but its durability and heat resistance are poor. This invention uses chitosan as a bridge connecting functional materials (multifunctional powders and functional modifiers) and polyacrylonitrile fibers, allowing chitosan to interact with the hydroxyl and amino groups on modified zeolite loaded with titanium dioxide and zinc oxide to form a dense and stable network structure. First, it solves the problem of poor functional durability of chitosan during polyacrylonitrile fiber spinning; second, it reduces the loss of multifunctional powders and functional modifiers, making their loss rate less than 1%; and it avoids the precipitation of long-lasting stable functional materials, enhances the compatibility of inorganic functional powders in the polyacrylonitrile stock solution system, and obtains a stable pre-spinning suspension, laying the foundation for the long-lasting realization of antibacterial, far-infrared, moisture-absorbing and heat-generating, and antistatic functions. Detailed Implementation

[0044] Example 1:

[0045] A long-lasting and stable functional material is prepared using the following method:

[0046] (1) Preparation of modified zeolite

[0047] S1 calcined the zeolite washed with deionized water at 350°C for 3 hours, cooled it to room temperature, and then ground it in a ball mill for 15 hours to obtain zeolite powder.

[0048] S2. Zeolite powder was placed in anhydrous ethanol at a mass-to-volume ratio of 1g:20mL and stirred evenly. Then, 5% of the volume of anhydrous ethanol was added to the modification solution. After reacting at 60℃ under argon atmosphere for 10h, the mixture was washed with anhydrous ethanol and dried to obtain the modified zeolite. The modification solution was prepared by mixing anhydrous ethanol, 3-aminopropyltriethoxysilane and water at a volume ratio of 7:4:2 and stirring evenly.

[0049] (2) Preparation of long-lasting stable functional materials

[0050] A prepares a functional modifier by mixing titanium dioxide and zinc oxide at a mass ratio of 1:3. Then, the functional modifier is dissolved in water at a mass ratio of 1:8 to prepare an aqueous solution of the functional modifier. Modified zeolite is added to the aqueous solution of the functional modifier at a mass ratio of 1:2 and stirred evenly. While stirring, saturated sodium bicarbonate solution is slowly added dropwise to adjust the pH to 7. After filtration and drying, the mixture is calcined at 100℃ for 2 hours and cooled to room temperature to obtain functional modified zeolite powder.

[0051] B: Soak the functional modified zeolite powder prepared in step A in deionized water at a mass-volume ratio of 1g:10mL for 4 hours, then remove and drain for later use.

[0052] C: Add chitosan with a degree of deacetylation of 85% to a 2wt% acetic acid solution at a mass-to-volume ratio of 1g:50mL, stir until fully dissolved, and then add the functional modified zeolite powder drained in step B. The mass ratio of chitosan to the drained functional modified zeolite powder is 2:15. While stirring, add a 5wt% glutaraldehyde solution. The mass-to-volume ratio of chitosan to the 5wt% glutaraldehyde solution is 1g:2mL. Stir at room temperature for 3 hours, wash and dry to obtain a long-lasting stable functional material.

[0053] Far-infrared antibacterial acrylic fibers were prepared using long-lasting stable functional materials. The preparation method was as follows: the long-lasting stable functional material was mixed with polyacrylonitrile spinning solution at a mass ratio of 1:5, and stirred thoroughly until homogeneous. The mixture was then wet-spun to obtain the far-infrared antibacterial acrylic fibers. The polyacrylonitrile spinning solution was prepared by dissolving polyacrylonitrile in dimethylacetamide at a mass ratio of 1:4, and stirring until dissolved. The viscosity of the polyacrylonitrile spinning solution at room temperature was 20 Pa·s.

[0054] Example 2:

[0055] A long-lasting and stable functional material is prepared using the following method:

[0056] (1) Preparation of modified zeolite

[0057] S1 calcined the zeolite washed with deionized water at 300℃ for 4 hours, cooled it to room temperature, and then ground it in a ball mill for 15 hours to obtain zeolite powder.

[0058] S2. Zeolite powder was placed in anhydrous ethanol at a mass-to-volume ratio of 1g:100mL and stirred evenly. Then, 8% of the volume of anhydrous ethanol was added to the modification solution. After reacting at 60℃ under argon atmosphere for 10h, the mixture was washed with anhydrous ethanol and dried to obtain the modified zeolite. The modification solution was prepared by mixing anhydrous ethanol, 3-aminopropyltrimethoxysilane and water at a volume ratio of 5:2:1 and stirring evenly.

[0059] (2) Preparation of long-lasting stable functional materials

[0060] A prepares a functional modifier by mixing titanium dioxide and zinc oxide at a mass ratio of 1:2. Then, the functional modifier is dissolved in water at a mass ratio of 1:5 to prepare an aqueous solution of the functional modifier. Modified zeolite is added to the aqueous solution of the functional modifier at a mass ratio of 1:1 and stirred evenly. While stirring, saturated sodium bicarbonate solution is slowly added dropwise to adjust the pH to 7. After filtration and drying, the mixture is calcined at 100℃ for 2.5h and cooled to room temperature to obtain functional modified zeolite powder.

[0061] B: Soak the functional modified zeolite powder prepared in step A in deionized water at a mass-volume ratio of 1g:4mL for 2 hours, then remove and drain for later use.

[0062] C: Add chitosan with a degree of deacetylation of 85% to a 2wt% acetic acid solution at a mass-to-volume ratio of 1g:20mL, stir until fully dissolved, and then add the functional modified zeolite powder drained in step B. The mass ratio of chitosan to the drained functional modified zeolite powder is 1:1. While stirring, add a 5wt% glutaraldehyde solution. The mass-to-volume ratio of chitosan to the 5wt% glutaraldehyde solution is 2g:3mL. Stir at room temperature for 2 hours, wash and dry to obtain a long-lasting stable functional material.

[0063] Far-infrared antibacterial acrylic fibers were prepared using long-lasting stable functional materials. The preparation method was as follows: the long-lasting stable functional material was mixed with polyacrylonitrile spinning solution at a mass ratio of 0.5:100, and stirred thoroughly until homogeneous. The mixture was then wet-spun to obtain the far-infrared antibacterial acrylic fibers. The polyacrylonitrile spinning solution was prepared by dissolving polyacrylonitrile in dimethylacetamide at a mass ratio of 1:4, and stirring until dissolved. The viscosity of the polyacrylonitrile spinning solution at room temperature was 20 Pa·s.

[0064] Example 3:

[0065] A long-lasting and stable functional material is prepared using the following method:

[0066] (1) Preparation of modified zeolite

[0067] S1 calcined the zeolite washed with deionized water at 400℃ for 2 hours, cooled it to room temperature, and then ground it with a ball mill for 15 hours to obtain zeolite powder.

[0068] S2. Zeolite powder was placed in anhydrous ethanol at a mass-to-volume ratio of 1g:12mL and stirred evenly. Then, 3% of the volume of anhydrous ethanol was added to the modification solution. After reacting at 60℃ under argon atmosphere for 10h, the mixture was washed with anhydrous ethanol and dried to obtain the modified zeolite. The modification solution was prepared by mixing anhydrous ethanol, 3-aminopropyltriethoxysilane and water at a volume ratio of 10:6:3 and stirring evenly.

[0069] (2) Preparation of long-lasting stable functional materials

[0070] A prepares a functional modifier by mixing titanium dioxide and zinc oxide at a mass ratio of 5:8. Then, the functional modifier is dissolved in water at a mass ratio of 1:10 to prepare an aqueous solution of the functional modifier. Modified zeolite is added to the aqueous solution of the functional modifier at a mass ratio of 1:5 and stirred evenly. While stirring, saturated sodium bicarbonate solution is slowly added dropwise to adjust the pH to 7. After filtration and drying, the mixture is calcined at 100℃ for 3 hours and cooled to room temperature to obtain functional modified zeolite powder.

[0071] B: Immerse the functional modified zeolite powder prepared in step A in deionized water at a mass-volume ratio of 1g:20mL for 6 hours, then remove and drain for later use.

[0072] C: Add chitosan with a degree of deacetylation of 85% to a 2wt% acetic acid solution at a mass-to-volume ratio of 1g:16mL, stir until fully dissolved, then add the functional modified zeolite powder drained in step B, where the mass ratio of chitosan to the drained functional modified zeolite powder is 1:4. While stirring, add a 5wt% glutaraldehyde solution, where the mass-to-volume ratio of chitosan to the 5wt% glutaraldehyde solution is 2g:5mL. Stir at room temperature for 3 hours, wash and dry to obtain a long-lasting stable functional material.

[0073] Far-infrared antibacterial acrylic fibers were prepared using long-lasting stable functional materials. The preparation method was as follows: the long-lasting stable functional material was mixed with polyacrylonitrile spinning solution at a mass ratio of 3:10, and stirred thoroughly until homogeneous. The mixture was then wet-spun to obtain the far-infrared antibacterial acrylic fibers. The polyacrylonitrile spinning solution was prepared by dissolving polyacrylonitrile in dimethylacetamide at a mass ratio of 1:4, and stirring until dissolved. The viscosity of the polyacrylonitrile spinning solution at room temperature was 20 Pa·s.

[0074] Comparative Example 1:

[0075] Select a representative example 1, remove step (1) of preparing modified zeolite, replace the modified zeolite with the same amount of ordinary zeolite as in example 1, and keep the rest the same as in example 1, as comparative example 1.

[0076] Comparative Example 2:

[0077] Example 1, a representative example, was selected. Steps B and C were removed. The functional modified zeolite powder, in the same amount as in Example 1, was used to replace the long-lasting stable functional material and was mixed with the polyacrylonitrile spinning solution for wet spinning. All other aspects were the same as in Example 1. This example served as Comparative Example 2.

[0078] The far-infrared antibacterial acrylic fibers prepared in Examples 1-3 and Comparative Examples 1-2 were subjected to performance testing.

[0079] Antistatic testing was conducted according to GB / T 12703.1-2021; antibacterial testing was conducted according to GB / T 20944.3-2008; far-infrared testing was conducted according to GB / T 30127-2013; and moisture absorption and heat generation testing was conducted according to FZ / T 73036-2020. The test results are shown in Table 1 below.

[0080] Table 1 Performance Test Experiment Data Table

[0081]

[0082] The experimental data above show that the far-infrared antibacterial acrylic fiber prepared in the embodiments of the present invention has an optimal electrostatic half-life of 0.028s; while Comparative Example 1 and Comparative Example 2 have 48s and 52s, respectively. The fiber of the present invention exhibits an inhibition rate of ≥86% against three bacteria (Staphylococcus aureus, Escherichia coli, and Candida albicans), demonstrating excellent antibacterial effects and meeting the national standard requirements for AAA-grade antibacterial textiles; while the inhibition rate of the three bacteria in the comparative examples is 37%–59%. The fiber of the present invention has a far-infrared emissivity ≥0.9 and a far-infrared radiation temperature rise value ≥1.6; while the fiber of the comparative examples has a far-infrared emissivity ≤0.77 and a far-infrared radiation temperature rise value ≤1.3. The fiber of the present invention exhibits a maximum temperature rise value of ≥6.6°C due to moisture absorption and heat generation; while the fiber of the comparative examples has a maximum temperature rise value of ≤3.6°C due to moisture absorption and heat generation.

[0083] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the present invention in any way. Other variations and modifications may be made without departing from the technical solutions described in the claims.

Claims

1. A long-lasting and stable functional material, characterized in that: Including natural extracts, multifunctional powders, and functional modifiers; The natural extract is selected from one or more of sorbic acid, chitosan, lignin, gelatin, lecithin, sodium alginate, and maltodextrin; The functional modifier is selected from one or more of the following: titanium dioxide, zinc sulfate, cadmium oxide, silver sulfonate, iron phthalocyanine, zinc oxide, tin dioxide, metal oxide coordinated amino organosilicon, undecynediol, zinc coordination compound, iron coordination compound, iodine coordination compound, silver coordination compound, and copper coordination compound. The multifunctional powder is a modified zeolite, and the preparation method of the modified zeolite includes the following steps: S1: After washing the zeolite with deionized water, calcine it at 300~400℃ for 2~4 days, cool it to room temperature, and then grind it with a ball mill to obtain zeolite powder. S2: Then, the zeolite powder is placed in anhydrous ethanol, stirred evenly, and then the modification solution is added. After reacting for 10 hours under argon at 60℃, it is washed and dried with anhydrous ethanol to obtain the modified zeolite. The mass-volume ratio of the zeolite powder to anhydrous ethanol is (1~5) g : (20~100) mL. The amount of the modification solution added is 3%-8% of the volume of anhydrous ethanol. The modification solution is obtained by mixing anhydrous ethanol, silicon-containing organic compound and water in a volume ratio of (5~10) : (2~6) : (1~3) and stirring evenly. The silicon-containing organic compound is selected from one or more of 3-aminopropyltriethoxysilane, 3-aminopropyltrimethoxysilane, N-(2-aminoethyl)-3-aminopropylmethyldimethoxysilane, diethylenetriaminopropyltrimethoxysilane, 3-isocyanatepropyltriethoxysilane, isobutyltriethoxysilane, and vinyltriethoxysilane. The preparation method of the long-lasting stable functional material includes the following steps: A: Add modified zeolite to the functional modifier aqueous solution, stir evenly, and slowly add alkaline aqueous solution dropwise while stirring to adjust the pH to 7. After filtration and drying, calcine at 100℃ for 2-3 hours, and cool to room temperature to obtain functional modified zeolite powder. B: Soak the functional modified zeolite powder in deionized water, then remove and drain for later use. C: Add chitosan to a 2wt% acetic acid solution and stir until fully dissolved. Then add the functional modified zeolite powder drained in step (2) and add 5wt% glutaraldehyde solution while stirring. Stir at room temperature for 2-3 hours, wash and dry to obtain a long-lasting stable functional material.

2. The long-lasting stable functional material according to claim 1, characterized in that: The natural extract is chitosan, and the degree of deacetylation of the chitosan is 85%~99%.

3. The long-lasting stable functional material according to claim 1, characterized in that: In step A, the mass ratio of the functional modifier to water in the aqueous solution is 1:(5~10), the mass ratio of the aqueous solution to the modified zeolite is 1:(1~5), and the alkaline aqueous solution is a saturated sodium bicarbonate solution.

4. The long-lasting stable functional material according to claim 1, characterized in that: The mass-to-volume ratio of the functional modified zeolite powder to deionized water in step B is (1~5) g : (10~20) mL, and the soaking time is 2~6 h.

5. The long-lasting stable functional material according to claim 1, characterized in that: In step C, the mass-to-volume ratio of chitosan to 2wt% acetic acid solution is (1~5) g : (20~80) mL, the mass-to-volume ratio of chitosan to drained functional modified zeolite powder is (1~5) : (1~20), and the mass-to-volume ratio of chitosan to 5wt% glutaraldehyde solution is 2 g : (3~5) mL.

6. The application of the long-lasting stable functional material according to claim 1 in far-infrared antibacterial polyacrylonitrile fiber, wherein the far-infrared antibacterial polyacrylonitrile fiber is prepared by adding the long-lasting stable functional material to the polyacrylonitrile spinning solution, stirring thoroughly and evenly, and then wet spinning to obtain far-infrared antibacterial polyacrylonitrile fiber.

7. The application according to claim 6, characterized in that: The mass ratio of the long-lasting stable functional material to the polyacrylonitrile spinning solution is (0.5~30):

100. The polyacrylonitrile spinning solution is prepared by dissolving polyacrylonitrile in dimethylacetamide and stirring until dissolved to obtain the polyacrylonitrile spinning solution. The dimethylacetamide accounts for 60%~90% of the mass of the polyacrylonitrile spinning solution.

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