High air permeability fibers, high air permeability textiles, and air permeable undergarments made therefrom

Abstract

This disclosure relates to the field of blended fiber technology, specifically to a high-breathability fiber, a high-breathability textile, and breathable underwear made therefrom. The high-breathability fiber is obtained by blending the following fibers: a) at least one modified plant fiber; b) at least one plant fiber; c) a first polymer fiber, wherein the first polymer fiber comprises a sheath layer and a core layer, the sheath layer being a modified polyester material and the core layer being a polylactic acid material; d) a second polymer fiber, the second polymer fiber comprising modified polylactic acid fiber.

Description

Technical Field

[0001] This disclosure relates to the field of blended fiber technology, specifically to a high-breathability fiber, a high-breathability textile, and breathable underwear made therefrom. Background Technology

[0002] Although traditional cotton fibers have the advantage of moisture absorption, the round cross-section and tight fabric structure of traditional cotton fiber textiles result in low air permeability. In existing technologies, synthetic fiber irregular cross-sections are generally relied upon, which results in stiff textiles, reduced skin-friendliness, and difficulty in degradation. In addition, cotton fibers are often flammable. Existing methods for improving the flame retardant properties of cotton fibers have the following shortcomings: (1) The finishing method requires a large amount of N-hydroxymethyl crosslinking agent, which releases formaldehyde; and the flame retardant ability will decrease after multiple washes; (2) The blending method requires the addition of ammonium polyphosphate masterbatch, which makes the textiles feel stiff and reduces air permeability; (3) The core-sheath composite flame retardant polyester blend with cotton can improve the flame retardant ability, but the biodegradability is not high.

[0003] Therefore, there is an urgent need to develop a blended fiber that combines high air permeability and good flame retardancy with good hand feel and degradation ability. Summary of the Invention

[0004] This disclosure provides an antibacterial and flame-retardant polylactic acid filament bundle and its preparation method to address the shortcomings of related technologies.

[0005] According to a first aspect of the present disclosure, a high-breathability fiber is provided, the high-breathability fiber being obtained by blending the following fibers;

[0006] a) At least one modified plant fiber;

[0007] b) At least one plant fiber;

[0008] c) A first polymer fiber, wherein the first polymer fiber comprises a sheath and a core, the sheath being a modified polyester material and the core being a polylactic acid material;

[0009] d) A second polymer fiber, comprising modified polylactic acid fiber.

[0010] In one aspect of this disclosure, the modified plant fiber is obtained by modifying plant fibers using quaternary ammonium salt compounds; the plant fiber is selected from one of cotton fiber, kapok fiber, flax fiber, ramie fiber, jute fiber, sisal fiber, abaca fiber, and bamboo fiber.

[0011] In one aspect of this disclosure, the plant fiber is selected from cotton fiber; the modified plant fiber is selected from cotton fiber modified with quaternary ammonium salt compounds, and the modified cotton fiber is prepared by the following steps:

[0012] Step 1a: Dissolve dimethyloctadecyl[3-(trimethoxysilyl)propyl]ammonium chloride in an aqueous ethanol solution, and add glacial acetic acid to adjust the pH to 5.0-6.0 to obtain a mixed solution;

[0013] Step 2a: Provide cotton fibers and soak them in the mixed solution obtained in step 1a. React at room temperature for 8-16 hours. After the reaction is complete, remove the cotton fibers, wash and dry them to obtain the modified plant fibers.

[0014] In one aspect of this disclosure, the modified polyester material in the first polymer fiber comprises the following components in parts by weight:

[0015] 90%-96% polyester material, 2%-5% layered bimetallic hydroxide, 0.05%-0.5% light stabilizer, 0.1%-0.3% antistatic agent, 0.25%-1% dispersant, 0.1%-0.3% antioxidant, and 0.25%-0.75% lubricant.

[0016] In one aspect of this disclosure, the layered bimetallic hydroxide in the first polymer fiber is selected from calcium aluminum hydrotalcite nanomaterials; the calcium aluminum hydrotalcite nanomaterials are prepared by the following steps:

[0017] Step 1b: Dissolve calcium nitrate tetrahydrate and aluminum nitrate nonahydrate in water to obtain the mixed solution from step 1b;

[0018] Step 2b: Dissolve sodium hydroxide in water to obtain the solution from step 2b;

[0019] Step 3b: Add the mixed solution from step 1b and the solution from step 2b simultaneously into a colloid mill reactor with a rotor speed of 2000-4000 rpm, react for 1-3 minutes, and then collect the slurry;

[0020] Step 4b: Place the slurry obtained in step 3b into a reaction vessel and react at 100℃-140℃ for 10-16 hours;

[0021] Step 5b: After the reaction is complete, collect the reaction mixture from step 4b, add it to deionized water, and obtain a solid product after centrifugation. After washing and drying, the solid product is obtained as the calcium aluminum hydrotalcite nanomaterial.

[0022] In one aspect of this disclosure, the modified polylactic acid fiber comprises the following components by weight percentage in the second polymer fiber:

[0023] 75%-85% polylactic acid material, 5%-15% modified cellulose nanocrystals, 0.1%-1% antioxidant, 0.1%-1% crystallization promoter and 0.5%-1.5% lubricant.

[0024] In one aspect of this disclosure, the modified cellulose nanocrystals are prepared by the following steps:

[0025] Step 1c: Add cellulose nanocrystals to an ethanol solution, disperse them after stirring, and adjust the pH to 4.0-4.2 with citric acid;

[0026] Step 2c: Add the silane coupling agent to the ethanol solution and stir for 3-6 hours;

[0027] Step 3c: Heat the solution obtained in step 1c to 75℃-90℃, purge with nitrogen for protection, then add the solution obtained in step 2c, and react for 4-8 hours; after the reaction is complete, collect the precipitate, and then wash and dry it to obtain the modified cellulose nanocrystals.

[0028] In one aspect of this disclosure, the high-breathability fiber is obtained by blending the following fibers;

[0029] a) Cotton fiber;

[0030] b) Modified cotton fibers;

[0031] c) A first polymer fiber, wherein the first polymer fiber comprises a sheath and a core layer, the sheath being a modified polyester material and the core layer being a polylactic acid material; the modified polyester material contains calcium aluminum hydrotalcite nanomaterials;

[0032] d) A second polymer fiber, the second polymer fiber comprising modified polylactic acid fiber; the modified polylactic acid fiber containing modified cellulose nanocrystals.

[0033] In one aspect of this disclosure, the polyester material is PET material.

[0034] In one aspect of the embodiments of this disclosure, the polylactic acid fiber is selected from one of poly-L-lactic acid, poly-D-lactic acid, and poly-racemic lactic acid, specifically poly-L-lactic acid.

[0035] In one aspect of the embodiments of this disclosure, in the first polymer fiber, the light stabilizer is selected from zinc oxide, titanium dioxide R103, light stabilizer BW-10LD, or ultramarine 5008.

[0036] In one aspect of the embodiments of this disclosure, in the first polymer fiber, the antistatic agent is selected from octadecyl dimethyl hydroxyethyl quaternary ammonium nitrate, stearamide propyl dimethyl-β-hydroxyethyl ammonium dihydrogen phosphate, polyoxyethylene fatty amine, potassium phosphate salt, sodium dioctyl sulfosuccinate, or polyether ester amide.

[0037] In one aspect of the embodiments of this disclosure, in the first polymer fiber, the dispersant is selected from sodium polynaphthalene sulfonate, EO-PO block copolymer, sodium acrylic acid-maleic anhydride copolymer, or lignin sulfonate.

[0038] In one aspect of the embodiments of this disclosure, in the first polymer fiber, the antioxidant is selected from antioxidant 1010, antioxidant 1076, antioxidant 626, antioxidant 264 or antioxidant 2112.

[0039] In one aspect of this disclosure, in the first polymer fiber, the lubricant is selected from pentaerythritol stearate, polyethylene wax, ethylene bis-stearamide, stearate, or dimethylsilane.

[0040] In one aspect of the embodiments of this disclosure, in the second polymer fiber, the antioxidant is selected from antioxidant 1010, antioxidant 1076, antioxidant 626, antioxidant 264 or antioxidant 2112.

[0041] In one aspect of the embodiments of this disclosure, in the second polymer fiber, the crystallization promoter is selected from talc, silica, nano-montmorillonite, metal phosphate, erucamide, stearamide, oleamide, ethylene bis-stearamide, ethylene bis-oleamide, or phthalamide.

[0042] In one aspect of this disclosure, in the second polymer fiber, the lubricant is selected from pentaerythritol stearate, polyethylene wax, ethylene bis-stearamide, stearate, or dimethylsilane.

[0043] According to a second aspect of the present disclosure, a high-breathability textile is provided, the high-breathability textile being woven from the aforementioned high-breathability fibers.

[0044] According to a third aspect of the present disclosure, a breathable underwear is provided, which is prepared from the aforementioned high-breathability textile.

[0045] The technical solutions provided by the embodiments of this disclosure may include the following beneficial effects:

[0046] As can be seen from the above embodiments, this disclosure prepares a blended fiber that has both high air permeability and good flame retardancy, as well as good hand feel and degradation ability. Detailed Implementation

[0047] Exemplary embodiments will now be described in detail. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this disclosure. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this disclosure as detailed in the appended claims.

[0048] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below in conjunction with embodiments. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. The embodiments described herein are illustrative in nature and are used to provide a basic understanding of this application. The embodiments of this application should not be construed as limiting this application.

[0049] For the sake of brevity, this article only discloses a few specific numerical ranges. However, any lower limit can be combined with any upper limit to form an unspecified range; and any lower limit can be combined with other lower limits to form an unspecified range, just as any upper limit can be combined with any other upper limit to form an unspecified range. Furthermore, each individually disclosed point or single value can itself serve as a lower or upper limit and be combined with any other point or single value or with other lower or upper limits to form an unspecified range.

[0050] In this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0051] In this description, unless otherwise stated, "above" and "below" include the stated number.

[0052] Unless otherwise stated, the terms used in this disclosure have their common meanings as commonly understood by those skilled in the art. Unless otherwise stated, the values ​​of the parameters mentioned in this disclosure can be measured using various measurement methods commonly used in the art (e.g., they can be tested according to the methods given in the embodiments of this disclosure).

[0053] The term "about" is used to describe and indicate small variations. When used in conjunction with an event or situation, the term may refer to examples in which the event or situation occurred precisely or in examples in which the event or situation occurred very approximately. For example, when used in conjunction with numerical values, the term may refer to a range of variation less than or equal to ±10% of the numerical value, such as less than or equal to ±5%, less than or equal to ±4%, less than or equal to ±3%, less than or equal to ±2%, less than or equal to ±1%, less than or equal to ±0.5%, less than or equal to ±0.1%, or less than or equal to ±0.05%. Additionally, quantities, ratios, and other numerical values ​​are sometimes presented in range format herein. It should be understood that such range format is for convenience and brevity and should be interpreted flexibly to include not only numerical values ​​explicitly specified as range limits but also all individual numerical values ​​or subranges covered within the range, as if each numerical value and subrange were explicitly specified.

[0054] The list of items connected by the terms "at least one of," "at least one of," "at least one of," or other similar terms can mean any combination of the listed items. For example, if items A and B are listed, then the phrase "at least one of A and B" means only A; only B; or A and B. In another instance, if items A, B, and C are listed, then the phrase "at least one of A, B, and C" means only A; or only B; only C; A and B (excluding C); A and C (excluding B); B and C (excluding A); or all of A, B, and C. Item A may contain a single component or multiple components. Item B may contain a single component or multiple components. Item C may contain a single component or multiple components.

[0055] The present disclosure will be further described below by way of specific embodiments. Unless otherwise specified, all chemical reagents used in the embodiments of the present disclosure are obtained through conventional commercial means. Unless otherwise specified, all contents mentioned below are mass contents. Unless otherwise specified, it is understood that the process is carried out at room temperature.

[0056] Example

[0057] Example 1:

[0058] Example 1 includes the following steps:

[0059] 1. Preparation of modified cotton fibers:

[0060] 0.5 parts by weight of dimethyloctadecyl[3-(trimethoxysilyl)propyl]ammonium chloride were dissolved in 32 parts by weight of 50% aqueous ethanol solution, and glacial acetic acid was added dropwise to adjust the pH to 5.4 to obtain a mixed solution. 25 parts by weight of cotton fiber were soaked in the mixed solution and reacted at room temperature for 12 hours. After the reaction was completed, the cotton fiber was taken out, washed and dried to obtain modified cotton fiber.

[0061] 2. Preparation of the first polymer fiber:

[0062] 2.1. Preparation of calcium aluminum hydrotalcite nanomaterials:

[0063] 2.5 parts by weight of calcium nitrate tetrahydrate and 1 part by weight of aluminum nitrate nonahydrate were dissolved in 200 parts by weight of water to obtain mixed solution A; 7.5 parts by weight of sodium hydroxide were dissolved in 200 parts by weight of water to obtain solution B; mixed solution A and solution B were simultaneously added to a colloid mill reactor with a rotor speed of 3500 rpm and reacted for 2 min, and then the slurry was collected; the slurry was added to a reaction vessel and reacted at 120℃ for 12 h; after the reaction was completed, the resulting mixture was collected, added to deionized water, and centrifuged (2000 rpm, 4 min) to obtain a solid product; the solid product was washed (once with water and twice with alcohol) and dried to obtain calcium aluminum hydrotalcite nanomaterials.

[0064] 2.2. Preparation of the first polymer fiber:

[0065] The following raw materials are provided in weight percentage:

[0066] PET polyester (93wt%), the aforementioned calcium aluminum hydrotalcite nanomaterial (4.5wt%), light stabilizer titanium dioxide R103 (0.3wt%), antistatic agent octadecyl dimethyl hydroxyethyl quaternary ammonium nitrate (0.2wt%), dispersant EO-PO block copolymer Pluronic PE 6200 (1wt%), antioxidant 1076 (0.3wt%), and lubricant pentaerythritol stearate (0.7wt%).

[0067] Calcium aluminum hydrotalcite nanomaterials and dispersants were added to a high-speed mixer and mixed at 800 rpm for 2 minutes. Then, light stabilizers, antistatic agents, and antioxidants were added, and mixing continued for 5 minutes to obtain a mixture. The mixture and PET polyester were then melt-co-extruded to obtain a masterbatch. The melt co-extruded parameters were: co-rotating twin screw φ35mm, L / D=48, temperature range: 220℃-240℃-255℃-260℃-260℃-255℃, screw speed 300 rpm, and vacuum degree ≤-0.08MPa. The masterbatch was then water-cooled, stretched, dried by air blowing, granulated (approximately 2mm), and then vacuum-dried at 120℃ for 12 hours.

[0068] The obtained masterbatch and polylactic acid resin were composite melt-spun using a core-sheath type two-component spinning machine. The screw configuration was as follows: sheath: φ45mm, L / D=30, temperature 260℃-270℃-275℃-275℃; core: φ40mm, L / D=28, temperature 190℃-200℃-205℃-205℃; the sheath pump was set to 24rpm, 30g / min; the core pump was set to 16rpm, 20g / min; the sheath-core mass ratio was 6:4; the melt channel temperature was set to 275℃ (sheath) and 205℃ (core); the component pressure was 12MPa; and the fiber exit speed was 1200m / min. After drawing, heat setting, and winding, the first polymer fiber was obtained.

[0069] 3. Preparation of the second polymer fiber:

[0070] 3.1. Preparation of modified cellulose nanocrystals:

[0071] Ten parts by weight of cellulose nanocrystals were added to 72 parts by weight of 90% ethanol solution and dispersed by stirring. Citric acid was added to adjust the pH to 4.1. Two parts by weight of silane coupling agent KH560 were added to 16 parts by weight of 90% ethanol solution and stirred for 4 hours. The solution containing cellulose nanocrystals was heated to 85°C and protected by nitrogen gas. Then, the solution containing silane coupling agent KH560 was added and reacted for 6 hours. After the reaction was completed, the precipitate was collected, washed, and dried to obtain modified cellulose nanocrystals.

[0072] 3.2. Preparation of the second polymer fiber:

[0073] The following raw materials are provided in weight percentage:

[0074] PLA resin (83wt%), the aforementioned modified cellulose nanocrystals (14wt%), antioxidant 1010 (1wt%), crystallization accelerator stearamide (1wt%), and lubricant pentaerythritol stearate (1wt%) were added to a high-speed mixer and mixed at 1000 rpm for 4 min to obtain a mixture. The mixture and PLA resin were then melt-co-extruded to obtain a masterbatch. The parameters for melt co-extruded were: co-rotating twin screw φ45mm, L / D=48, temperature range: 160℃-175℃-185℃-190℃-195℃-195℃-190℃-185℃-180℃-175℃, screw speed 250 rpm, and vacuum degree ≤-0.08MPa. The masterbatch was then water-cooled, dried by air blowing, granulated (approximately 2mm), and then vacuum-dried at 120℃ for 12 h. The obtained masterbatch is melt-spun at a melt pressure of 8 MPa, φ30 mm, and L / D=30; then, after stretching, heat setting, and winding, a second polymer fiber is obtained.

[0075] 4. Preparation of blended fibers:

[0076] Cotton fibers are provided, and the aforementioned modified cotton fibers, first polymer fibers, and second polymer fibers are cut to the same length as the cotton fibers and relaxed in hot air at 70°C for 20 minutes to eliminate internal stress from curling. The cotton fibers and modified cotton fibers are then alternately laid in 6 layers, each layer ≤10cm thick, to obtain the first fabric. The first polymer fibers and second polymer fibers are then alternately laid in 4 layers and opened twice using a micro-opening machine to obtain the second fabric. The first and second fabrics are then laid in a 45:55 weight ratio to obtain the total blend. The total blend is then spun and finished to obtain blended fibers.

[0077] Comparative Example 1:

[0078] The difference between Comparative Example 1 and Example 1 is that Comparative Example 1 does not involve the preparation of modified cotton fibers, and the resulting blended fibers do not contain modified cotton fibers.

[0079] Comparative Example 2:

[0080] The difference between Comparative Example 2 and Example 1 is that Comparative Example 2 does not contain the first polymer fiber, and the resulting blended fiber does not contain the first polymer fiber either.

[0081] Comparative Example 3:

[0082] The difference between Comparative Example 3 and Example 1 is that Comparative Example 3 does not contain the second polymer fiber, and the resulting blended fiber does not contain the second polymer fiber.

[0083] Example 2:

[0084] Example 2 includes the following steps:

[0085] 1. Preparation of modified cotton fibers:

[0086] 0.5 parts by weight of dimethyloctadecyl[3-(trimethoxysilyl)propyl]ammonium chloride were dissolved in 32 parts by weight of 50% aqueous ethanol solution, and glacial acetic acid was added dropwise to adjust the pH to 5.4 to obtain a mixed solution. 25 parts by weight of cotton fiber were soaked in the mixed solution and reacted at room temperature for 12 hours. After the reaction was completed, the cotton fiber was taken out, washed and dried to obtain modified cotton fiber.

[0087] 2. Preparation of the first polymer fiber:

[0088] PET polyester (97.5wt%), light stabilizer titanium dioxide R103 (0.3wt%), antistatic agent octadecyl dimethyl hydroxyethyl quaternary ammonium nitrate (0.2wt%), dispersant EO-PO block copolymer Pluronic PE 6200 (1wt%), antioxidant 1076 (0.3wt%), lubricant pentaerythritol stearate (0.7wt%).

[0089] Dispersant, light stabilizer, antistatic agent, and antioxidant are added to a high-speed mixer and mixed at 800 rpm for 5 minutes to obtain a mixture. Then, the mixture and PET polyester are melt co-extruded to obtain a masterbatch. The parameters for melt co-extrusion are: co-rotating twin screw φ35mm, L / D=48, temperature range: 220℃-240℃-255℃-260℃-260℃-255℃, screw speed 300 rpm, and vacuum degree ≤-0.08MPa. The masterbatch is then water-cooled, stretched, dried by air blowing, granulated (about 2mm), and then vacuum dried at 120℃ for 12 hours.

[0090] The obtained masterbatch and polylactic acid resin were composite melt-spun using a core-sheath type two-component spinning machine. The screw configuration was as follows: sheath: φ45mm, L / D=30, temperature 260℃-270℃-275℃-275℃; core: φ40mm, L / D=28, temperature 190℃-200℃-205℃-205℃; the sheath pump was set to 24rpm, 30g / min; the core pump was set to 16rpm, 20g / min; the sheath-core mass ratio was 6:4; the melt channel temperature was set to 275℃ (sheath) and 205℃ (core); the component pressure was 12MPa; and the fiber exit speed was 1200m / min. After drawing, heat setting, and winding, the first polymer fiber was obtained.

[0091] 3. Preparation of the second polymer fiber:

[0092] 3.1. Preparation of modified cellulose nanocrystals:

[0093] Ten parts by weight of cellulose nanocrystals were added to 72 parts by weight of 90% ethanol solution and dispersed by stirring. Citric acid was added to adjust the pH to 4.1. Two parts by weight of silane coupling agent KH560 were added to 16 parts by weight of 90% ethanol solution and stirred for 4 hours. The solution containing cellulose nanocrystals was heated to 85°C and protected by nitrogen gas. Then, the solution containing silane coupling agent KH560 was added and reacted for 6 hours. After the reaction was completed, the precipitate was collected, washed, and dried to obtain modified cellulose nanocrystals.

[0094] 3.2. Preparation of the second polymer fiber:

[0095] The following raw materials are provided in weight percentage:

[0096] PLA resin (83wt%), the aforementioned modified cellulose nanocrystals (14wt%), antioxidant 1010 (1wt%), crystallization accelerator stearamide (1wt%), and lubricant pentaerythritol stearate (1wt%) were added to a high-speed mixer and mixed at 1000 rpm for 4 min to obtain a mixture. The mixture and PLA resin were then melt-co-extruded to obtain a masterbatch. The parameters for melt co-extruded were: co-rotating twin screw φ45mm, L / D=48, temperature range: 160℃-175℃-185℃-190℃-195℃-195℃-190℃-185℃-180℃-175℃, screw speed 250 rpm, and vacuum degree ≤-0.08MPa. The masterbatch was then water-cooled, dried by air blowing, granulated (approximately 2mm), and then vacuum-dried at 120℃ for 12 h. The obtained masterbatch is melt-spun at a melt pressure of 8 MPa, φ30 mm, and L / D=30; then, after stretching, heat setting, and winding, a second polymer fiber is obtained.

[0097] 4. Preparation of blended fibers:

[0098] Cotton fibers are provided, and the aforementioned modified cotton fibers, first polymer fibers, and second polymer fibers are cut to the same length as the cotton fibers and relaxed in hot air at 70°C for 20 minutes to eliminate internal stress from curling. The cotton fibers and modified cotton fibers are then alternately laid in 6 layers, each layer ≤10cm thick, to obtain the first fabric. The first polymer fibers and second polymer fibers are then alternately laid in 4 layers and opened twice using a micro-opening machine to obtain the second fabric. The first and second fabrics are then laid in a 45:55 weight ratio to obtain the total blend. The total blend is then spun and finished to obtain blended fibers.

[0099] The main difference between Example 2 and Example 1 is that Example 2 does not involve the preparation of calcium aluminum hydrotalcite nanomaterials.

[0100] Example 3:

[0101] Example 3 includes the following steps:

[0102] 1. Preparation of modified cotton fibers:

[0103] 0.5 parts by weight of dimethyloctadecyl[3-(trimethoxysilyl)propyl]ammonium chloride were dissolved in 32 parts by weight of 50% aqueous ethanol solution, and glacial acetic acid was added dropwise to adjust the pH to 5.4 to obtain a mixed solution. 25 parts by weight of cotton fiber were soaked in the mixed solution and reacted at room temperature for 12 hours. After the reaction was completed, the cotton fiber was taken out, washed and dried to obtain modified cotton fiber.

[0104] 2. Preparation of the first polymer fiber:

[0105] 2.1. Preparation of calcium aluminum hydrotalcite nanomaterials:

[0106] 2.5 parts by weight of calcium nitrate tetrahydrate and 1 part by weight of aluminum nitrate nonahydrate were dissolved in 200 parts by weight of water to obtain mixed solution A; 7.5 parts by weight of sodium hydroxide were dissolved in 200 parts by weight of water to obtain solution B; mixed solution A and solution B were simultaneously added to a colloid mill reactor with a rotor speed of 3500 rpm and reacted for 2 min, and then the slurry was collected; the slurry was added to a reaction vessel and reacted at 120℃ for 12 h; after the reaction was completed, the resulting mixture was collected, added to deionized water, and centrifuged (2000 rpm, 4 min) to obtain a solid product; the solid product was washed (once with water and twice with alcohol) and dried to obtain calcium aluminum hydrotalcite nanomaterials.

[0107] 2.2. Preparation of the first polymer fiber:

[0108] The following raw materials are provided in weight percentage:

[0109] PET polyester (93wt%), the aforementioned calcium aluminum hydrotalcite nanomaterial (4.5wt%), light stabilizer titanium dioxide R103 (0.3wt%), antistatic agent octadecyl dimethyl hydroxyethyl quaternary ammonium nitrate (0.2wt%), dispersant EO-PO block copolymer Pluronic PE 6200 (1wt%), antioxidant 1076 (0.3wt%), and lubricant pentaerythritol stearate (0.7wt%).

[0110] Calcium aluminum hydrotalcite nanomaterials and dispersants were added to a high-speed mixer and mixed at 800 rpm for 2 minutes. Then, light stabilizers, antistatic agents, and antioxidants were added, and mixing continued for 5 minutes to obtain a mixture. The mixture and PET polyester were then melt-co-extruded to obtain a masterbatch. The melt co-extruded parameters were: co-rotating twin screw φ35mm, L / D=48, temperature range: 220℃-240℃-255℃-260℃-260℃-255℃, screw speed 300 rpm, and vacuum degree ≤-0.08MPa. The masterbatch was then water-cooled, stretched, dried by air blowing, granulated (approximately 2mm), and then vacuum-dried at 120℃ for 12 hours.

[0111] The obtained masterbatch and polylactic acid resin were composite melt-spun using a core-sheath type two-component spinning machine. The screw configuration was as follows: sheath: φ45mm, L / D=30, temperature 260℃-270℃-275℃-275℃; core: φ40mm, L / D=28, temperature 190℃-200℃-205℃-205℃; the sheath pump was set to 24rpm, 30g / min; the core pump was set to 16rpm, 20g / min; the sheath-core mass ratio was 6:4; the melt channel temperature was set to 275℃ (sheath) and 205℃ (core); the component pressure was 12MPa; and the fiber exit speed was 1200m / min. After drawing, heat setting, and winding, the first polymer fiber was obtained.

[0112] 3. Preparation of the second polymer fiber:

[0113] The following raw materials are provided in weight percentage:

[0114] PLA resin (97wt%), antioxidant 1010 (1wt%), crystallization accelerator stearamide (1wt%), and lubricant pentaerythritol stearate (1wt%) were added to a high-speed mixer and mixed at 1000 rpm for 4 min to obtain a mixture. The mixture and PLA resin were then melt co-extruded to obtain a masterbatch. The parameters for melt co-extruded were: co-rotating twin screw φ45mm, L / D=48, temperature range: 160℃-175℃-185℃-190℃-195℃-195℃-190℃-185℃-180℃-175℃, screw speed 250 rpm, and vacuum degree ≤-0.08MPa. The masterbatch was then water-cooled, dried by air blowing, granulated (approximately 2mm), and then vacuum dried at 120℃ for 12 h. The obtained masterbatch is melt-spun at a melt pressure of 8 MPa, φ30 mm, and L / D=30; then, after stretching, heat setting, and winding, a second polymer fiber is obtained.

[0115] 4. Preparation of blended fibers:

[0116] Cotton fibers are provided, and the aforementioned modified cotton fibers, first polymer fibers, and second polymer fibers are cut to the same length as the cotton fibers and relaxed in hot air at 70°C for 20 minutes to eliminate internal stress from curling. The cotton fibers and modified cotton fibers are then alternately laid in 6 layers, each layer ≤10cm thick, to obtain the first fabric. The first polymer fibers and second polymer fibers are then alternately laid in 4 layers and opened twice using a micro-opening machine to obtain the second fabric. The first and second fabrics are then laid in a 45:55 weight ratio to obtain the total blend. The total blend is then spun and finished to obtain blended fibers.

[0117] Performance testing:

[0118] Breathability: Samples of equal area from the examples and comparative examples were cut and tested according to GB / T 5453-2025. The results are shown in Table 1.

[0119] Flame retardant properties: Samples of equal mass from the examples and comparative examples were cut and their flame retardant properties were tested. The shorter the self-extinguishing time, the better the flame retardant properties of the rubber. The values ​​are shown in Table 1 below.

[0120] Antibacterial properties: The samples obtained from the examples and comparative examples were cut into small pieces, and 0.1g of each sample was taken. According to GB / T20944.3-2008 "Evaluation of antibacterial properties of textiles - Part 3: Shaking method", the antibacterial properties of the samples obtained from the examples and comparative examples were tested using Gram-positive Staphylococcus aureus as the test species. The test results are shown in Table 1. Subsequently, the samples obtained from the examples and comparative examples were washed with water 30 times, dried, and 0.1g of each sample was cut into small pieces for antibacterial property testing. The test results are shown in Table 1.

[0121] Table 1:

[0122] Self-extinguishing time (s) Air permeability (mm / s) Staphylococcus aureus (%) Example 1 3.5 179 94.2 Comparative Example 1 4.6 162 58.9 Comparative Example 2 12.4 157 87.5 Comparative Example 3 7.9 160 85.3 Example 2 10.5 167 88.7 Example 3 7.3 158 85.9

[0123] As can be seen, the antibacterial effect of Example 1 is significantly better than that of Comparative Example 1, which is due to the modification of cotton fibers by quaternary ammonium salt compounds. Compared with Comparative Examples 1 to 3 and Examples 2 to 3, the air permeability of Example 1 is significantly better. This is because calcium aluminum hydrotalcite and modified CNC partially migrate to the yarn surface during the melt spinning process, forming rough surface protrusions. These protrusions prevent adjacent monofilaments from adhering tightly, forming extremely fine channels, thereby improving air permeability (and it can be seen that modified CNC plays a greater role in forming rough surface protrusions to enhance air permeability). The flame retardant effect of Comparative Example 2 and Example 2 is not as good as that of other examples and comparative examples. This is because calcium aluminum hydrotalcite has a good flame retardant effect, and it can release CO2 and H2O at high temperatures, thus playing a good flame retardant role.

[0124] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the disclosure herein. This disclosure is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein.

Claims

1. A high permeability fiber characterized by, The high-breathability fiber is obtained by blending the following fibers; a) At least one modified plant fiber; b) At least one plant fiber; c) A first polymer fiber, wherein the first polymer fiber comprises a sheath and a core, the sheath being a modified polyester material and the core being a polylactic acid material; d) A second polymer fiber, the second polymer fiber comprising modified polylactic acid fiber; In the first polymer fiber, the modified polyester material comprises the following components in parts by weight: 90%-96% polyester material, 2%-5% layered bimetallic hydroxide, 0.05%-0.5% light stabilizer, 0.1%-0.3% antistatic agent, 0.25%-1% dispersant, 0.1%-0.3% antioxidant, and 0.25%-0.75% lubricant; In the first polymer fiber, the layered bimetallic hydroxide is selected from calcium aluminum hydrotalcite nanomaterials; In the second polymer fiber, the modified polylactic acid fiber comprises the following components by weight percentage: 75%-85% polylactic acid material, 5%-15% modified cellulose nanocrystals, 0.1%-1% antioxidant, 0.1%-1% crystallization accelerator, and 0.5%-1.5% lubricant; The modified cellulose nanocrystals are prepared through the following steps: Step 1c: Add cellulose nanocrystals to an ethanol solution, disperse them after stirring, and adjust the pH to 4.0-4.2 with citric acid; Step 2c: Add the silane coupling agent to the ethanol solution and stir for 3-6 hours; Step 3c: Heat the solution obtained in step 1c to 75℃-90℃, purge with nitrogen for protection, then add the solution obtained in step 2c, and react for 4-8 hours; after the reaction is complete, collect the precipitate, and then wash and dry it to obtain the modified cellulose nanocrystals.

2. The high air permeability fiber according to claim 1, characterized in that, The modified plant fiber is obtained by modifying plant fiber using quaternary ammonium salt compounds; the plant fiber is selected from one of cotton fiber, kapok fiber, flax fiber, ramie fiber, jute fiber, sisal fiber, abaca fiber, and bamboo fiber.

3. The high air permeability fiber according to claim 2, characterized in that, The plant fiber is selected from cotton fiber; the modified plant fiber is selected from cotton fiber modified with quaternary ammonium salt compounds, and the modified cotton fiber is prepared by the following steps: Step 1a: Dissolve dimethyloctadecyl[3-(trimethoxysilyl)propyl]ammonium chloride in an aqueous ethanol solution, and add glacial acetic acid to adjust the pH to 5.0-6.0 to obtain a mixed solution; Step 2a: Provide cotton fibers and soak them in the mixed solution obtained in step 1a. React at room temperature for 8-16 hours. After the reaction is complete, remove the cotton fibers, wash and dry them to obtain the modified plant fibers.

4. The high air permeability fiber according to claim 1, characterized in that, The calcium aluminum hydrotalcite nanomaterial was prepared through the following steps: Step 1b: Dissolve calcium nitrate tetrahydrate and aluminum nitrate nonahydrate in water to obtain the mixed solution from step 1b; Step 2b: Dissolve sodium hydroxide in water to obtain the solution from step 2b; Step 3b: Add the mixed solution from step 1b and the solution from step 2b simultaneously into a colloid mill reactor with a rotor speed of 2000-4000 rpm, react for 1-3 minutes, and then collect the slurry; Step 4b: Place the slurry obtained in step 3b into a reaction vessel and react at 100℃-140℃ for 10-16 hours; Step 5b: After the reaction is complete, collect the reaction mixture from step 4b, add it to deionized water, and obtain a solid product after centrifugation. After washing and drying, the solid product is obtained as the calcium aluminum hydrotalcite nanomaterial.

5. The high air permeability fiber according to any one of claims 1-4, characterized in that, The high-breathability fiber is obtained by blending the following fibers; a) Cotton fiber; b) Modified cotton fibers; c) A first polymer fiber, wherein the first polymer fiber comprises a sheath and a core layer, the sheath being a modified polyester material and the core layer being a polylactic acid material; the modified polyester material contains calcium aluminum hydrotalcite nanomaterials; d) A second polymer fiber, the second polymer fiber comprising modified polylactic acid fiber; the modified polylactic acid fiber containing modified cellulose nanocrystals.

6. The high air permeability fiber according to any one of claims 1-4, characterized in that, The high-breathability fiber meets at least one of the following conditions: (1) In the first polymer fiber, the light stabilizer is selected from zinc oxide, titanium dioxide R103, light stabilizer BW-10LD or ultramarine 5008; (2) In the first polymer fiber, the antistatic agent is selected from octadecyl dimethyl hydroxyethyl quaternary ammonium nitrate, stearamide propyl dimethyl-β-hydroxyethyl ammonium dihydrogen phosphate, polyoxyethylene fatty amine, potassium phosphate, sodium dioctyl sulfosuccinate or polyether ester amide. (3) In the first polymer fiber, the dispersant is selected from sodium polynaphthalene sulfonate, EO-PO block copolymer, sodium acrylic acid-maleic anhydride copolymer or lignin sulfonate; (4) In the first polymer fiber, the antioxidant is selected from antioxidant 1010, antioxidant 1076, antioxidant 626, antioxidant 264 or antioxidant 2112; (5) In the first polymer fiber, the lubricant is selected from pentaerythritol stearate, polyethylene wax, ethylene bis-stearamide, stearate or dimethylsilane; (6) In the second polymer fiber, the antioxidant is selected from antioxidant 1010, antioxidant 1076, antioxidant 626, antioxidant 264 or antioxidant 2112; (7) In the second polymer fiber, the crystallization promoter is selected from talc, silica, nano-montmorillonite, metal phosphate, erucamide, stearamide, oleamide, ethylene bis-stearamide, ethylene bis-oleamide or phthalamide. (8) In the second polymer fiber, the lubricant is selected from pentaerythritol stearate, polyethylene wax, ethylene bis-stearamide, stearate or dimethylsilane.

7. A highly breathable textile, characterized in that, The high-breathability textile is woven from the high-breathability fiber described in any one of claims 1-6.

8. A breathable underwear, characterized in that, The breathable underwear is prepared using the high breathability textile described in claim 7.