Dry skin-friendly fiber fabric, preparation method thereof and application of dry skin-friendly fiber fabric in underwear

Abstract

The invention relates to the technical field of high-performance polyester fibers, and discloses a dry skin-friendly fiber fabric, a preparation method thereof and application of the dry skin-friendly fiber fabric in underwear. The preparation method of the dry and comfortable skin-friendly fiber fabric comprises the following steps: carrying out reaction on terephthalic acid, ethylene glycol and an antibacterial modified diamide diol monomer to obtain modified polyester; the modified polyester and the polyester master batch are mixed and spun, and the modified profiled polyester fiber is obtained; dipping the modified profiled polyester fiber in a finishing liquid containing a biopolymer finishing agent to obtain the high-performance polyester fiber, blending and knitting high-performance polyester fibers, cotton fibers and mulberry silk fibers to obtain a dry skin-friendly fiber fabric; the dry and comfortable skin-friendly fiber fabric has excellent antibacterial performance, moisture absorption performance and skin-friendly performance, the skin can be kept dry and comfortable, safe and comfortable wearing experience is provided for a wearer, and the dry and comfortable skin-friendly fiber fabric can be used for underwear and other underwear materials.

Description

Technical Field

[0001] This invention relates to the field of high-performance polyester fiber technology, specifically to a dry and skin-friendly fiber fabric, its preparation method, and its application in underwear. Background Technology

[0002] With social development and the improvement of people's living standards, consumers' demands for clothing have moved beyond the traditional level of simply covering and keeping warm, and are now focused on comfort. Since underwear is worn close to the skin, wearers are far more sensitive to the moisture-wicking, breathable, dry, and skin-friendly properties of the fabric than to other clothing categories. Furthermore, the antibacterial function of underwear can significantly improve the wearer's safety and reduce various diseases caused by bacterial growth. Therefore, underwear fabrics with skin-friendly, dry, and antibacterial composite functions have a broad consumer market.

[0003] Polyester fibers are widely used in clothing, home furnishings, and industrial textiles due to their economic efficiency, excellent mechanical properties, and dimensional stability. However, due to their highly crystalline and ordered molecular structure, and the lack of active hydrophilic groups that can promote water molecule adsorption, polyester fibers have poor moisture absorption properties. This results in sweat not being able to be wicked away from the skin in a timely manner, making fabrics made from polyester fibers less skin-friendly and reducing wearing comfort. At the same time, the insufficient antibacterial properties of polyester fibers limit their application in antibacterial underwear fabrics. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a method for preparing a dry and skin-friendly fiber fabric, comprising the following steps: Step 1: Using 6-hydroxyhexanoic acid and 1,5-diaminopentane as raw materials, react to prepare a diamide diol monomer; using 3-dimethylamino-1,2-propanediol and 1-bromotetradecane as raw materials, react to prepare a quaternary ammonium salt compound; combine the quaternary ammonium salt compound and the diamide diol monomer through a chemical reaction to prepare an antibacterial modified diamide diol monomer; Step 2: Mix terephthalic acid, ethylene glycol, and antibacterial modified diamide glycol monomer in a mass ratio of 100:(20-40):(60-80):0.02, react, and prepare modified polyester; mix the modified polyester and polyester masterbatch, spin, and prepare modified profiled polyester fibers. Step 3: Impregnate the modified shaped polyester fiber in a finishing solution containing a binary copolymer finishing agent, cure it, and prepare high-performance polyester fiber; blend the high-performance polyester fiber, cotton fiber, and mulberry silk fiber to form a composite yarn, knit it, and prepare a dry and skin-friendly fiber fabric.

[0005] Preferably, in step one, the preparation method of the antibacterial modified diamide diol monomer specifically includes: mixing 6-hydroxyhexanoic acid, N-(3-dimethylaminopropyl)-N′-ethylcarbodiimide hydrochloride, N-hydroxysuccinimide, N,N-dimethylformamide, and 1,5-diaminopentane in a mass ratio of (20-30):(28.9-43.4):(16.9-25.3):(300-400):(5.1-10.2), and stirring the mixture at 28-32°C for 14-16 hours. Purification yields a diamide diol monomer; 3-dimethylamino-1,2-propanediol, 1-bromotetradecane, and N,N-dimethylformamide are mixed in a mass ratio of (11.9-23.8):(27.7-55.4):(80-120), and reacted at 70-80℃ for 8-14 h, followed by purification to obtain a quaternary ammonium salt compound; the diamide diol monomer, isophorone diisocyanate, dibutyltin dilaurate, and N,N-dimethylformamide are mixed, heated to 45-55℃, and stirred for 10-14 h, then... Then, a quaternary ammonium salt compound was added, and the temperature was kept constant. The reaction was continued with stirring for 10-14 hours, followed by purification to obtain an antibacterial modified diamide diol monomer. The mass ratio of the diamide diol monomer, isophorone diisocyanate, dibutyltin dilaurate, N,N-dimethylformamide, and quaternary ammonium salt compound was (16.5-33):(11.1-22.2):(0.1-0.3):(300-400):(19.6-39.2). In the above process, N-(3-dimethylaminopropyl)-N′-ethyl Under the action of carbodiimide hydrochloride and N-hydroxysuccinimide, 6-hydroxyhexanoic acid and 1,5-diaminopentane are combined through an amidation reaction to obtain a diamide diol monomer with excellent hydrophilicity and flexibility; 3-dimethylamino-1,2-propanediol and 1-bromotetradecane undergo a quaternization reaction to obtain a quaternary ammonium salt compound with hydrophilicity, antibacterial properties, and flexible alkyl long chains; next, the quaternary ammonium salt compound and the diamide diol monomer are crosslinked through the isocyanate group of isophorone diisocyanate to obtain an antibacterial modified diamide diol monomer.

[0006] Preferably, in step two, the method for preparing the modified polyester specifically includes: mixing terephthalic acid, ethylene glycol, antibacterial modified diamide diol monomer, and tetrabutyl titanate, esterifying at 180-240℃ for 2.5-3.5h, and then melt polycondensing at 255-265℃ for 1.5-2.5h to obtain the modified polyester.

[0007] Preferably, in step two, the mass ratio of the modified polyester to the polyester masterbatch is (3.5-4.5):2; the spinning temperature is 230-250℃; and the spinning is carried out using a spinning method with a shaped spinneret, wherein the shaped spinneret is a hollow spinneret.

[0008] In the above process, antibacterial modified diamide diol monomers replace part of the ethylene glycol in the reaction with terephthalic acid. Through esterification and polycondensation, modified polyester is obtained. The modified polyester is then mixed with polyester masterbatch to obtain modified profiled polyester fibers. The introduction of antibacterial modified diamide diol monomers into the modified polyester has a significant impact on the improvement of the antibacterial properties, softness, and hydrophilic moisture absorption properties of the polyester fibers. Furthermore, processing the polyester fibers into hollow profiled structures can improve the moisture absorption and perspiration wicking properties of the polyester fibers, keeping the skin dry.

[0009] Preferably, in step three, the impregnation conditions are as follows: the modified shaped polyester fiber is added to the finishing solution at a bath ratio of (15-25):1, and impregnated at room temperature for 40-80 minutes, wherein the mass fraction of the binary copolymer finishing agent in the finishing solution is 3-5%; the curing conditions are: curing at 160-170℃ for 120-150 seconds.

[0010] Preferably, in step three, the mass ratio of the high-performance polyester fiber, cotton fiber, and mulberry silk fiber is (50-60):(20-30):(5-15); and the English count of the composite yarn is 30-40S.

[0011] Further, in step three, the preparation method of the modified copolyether specifically includes: step S1, mixing the copolyether, epoxybutene, and tetrahydrofuran at a mass ratio of 10:(1.2-2.6):80, stirring and reacting at room temperature for 20-24 h to obtain the modified copolyether; mixing N,N-dimethylethylenediamine, 4-hydroxynonenal, and ethanol at a mass ratio of (4.4-8.8):(7.8-15.6):150, reacting at 60-70℃ for 2.5-3.5 h in a nitrogen atmosphere to obtain an intermediate product; adding the intermediate product to tetrahydrofuran, stirring, then adding 1,3-propanesulfonyl lactone, and reacting at 56-62℃ for 10-16 h to obtain a sulfonated betaine compound; wherein, the mass ratio of the intermediate product, tetrahydrofuran, and 1,3-propanesulfonyl lactone is (11.3-22.6). ): (120-150): (6.1-12.2); The sulfonic acid betaine base compound, modified copolyether, ammonium persulfate, and water / methanol mixture are mixed in a mass ratio of (8.7-17.4): (3.6-5.4): (0.2-0.3): (150-200), and reacted at 68-72℃ for 22-26h in a nitrogen atmosphere to obtain a binary copolymer finishing agent; Further, in step S1, the preparation method of the copolyether specifically includes: in a nitrogen atmosphere, ethylene glycol and 2-aminobutane-1,4-diol are mixed in a mass ratio of 8: (2-5), and concentrated sulfuric acid accounting for 0.7-1.3wt% of the total reaction mixture is added under stirring at a speed of 200-300r / min, and heated to 165-175℃ for 7-9h to obtain the copolyether.

[0012] In the above process, ethylene glycol and 2-aminobutane-1,4-diol undergo dehydration copolymerization under the action of concentrated sulfuric acid to obtain a copolyether containing amino groups; the copolyether combines with epoxybutene through the reaction between amino and epoxy groups, introducing carbon-carbon double bonds into the copolyether structure; the amino group of N,N-dimethylethylenediamine reacts with the aldehyde group of 4-hydroxynonenal in a Schiff base reaction to obtain an intermediate product containing hydroxyl groups, carbon-carbon double bonds, Schiff base bonds, and tertiary amine groups; 1,3-propanesulfonyl lactone undergoes ring-opening reaction with the tertiary amine in the intermediate product to obtain a sulfonate betaine compound with antibacterial properties; the sulfonate betaine compound copolymerizes with the modified copolyether under the action of an initiator to obtain a binary copolymer finishing agent.

[0013] During the finishing process of modified profiled polyester fibers using binary copolymer finishing agents, the sulfonate betaine structure binds to the benzene rings in the polyester through cation-π interactions. Simultaneously, the binary copolymer finishing agent can also bind to the modified profiled polyester fibers through hydrogen bonding. Under the dual effects of cation-π interactions and hydrogen bonding, a strong interaction is formed between the binary copolymer finishing agent and the modified profiled polyester fibers, thereby improving the wash resistance of the fabric. In addition, the betaine groups and Schiff base groups of the binary copolymer finishing agent have excellent antibacterial properties. The sulfonate betaine compound and the modified copolyether also have a positive impact on the hydrophilic and moisture-wicking properties of the polyester fibers. Furthermore, the flexible polyether chain provided by the copolyether can also improve the softness of the fabric.

[0014] The dry and skin-friendly fiber fabric is prepared using the aforementioned method.

[0015] The application of the dry and skin-friendly fiber fabric in underwear.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This invention uses an antibacterial modified diamide diol monomer to replace part of the ethylene glycol in the reaction with terephthalic acid to obtain a modified polyester. The modified polyester is then mixed with polyester masterbatch to obtain modified profiled polyester fibers. The introduction of the antibacterial modified diamide diol monomer endows the polyester fibers with antibacterial properties, hydrophilic moisture absorption, softness, comfort, and skin-friendliness. In addition, this invention uses a method of introducing the antibacterial modified diamide diol monomer into the polyester structure, which solves the problems of poor additive dispersibility and short-lasting modification effect that are easily encountered in the traditional method of modifying polyester by adding modifiers. Furthermore, processing the polyester fibers into hollow profiled structures can further improve the moisture absorption and perspiration wicking properties of the polyester fibers, thereby keeping the skin dry. 2. This invention treats modified profiled polyester fibers with a finishing liquid containing a binary copolymer finishing agent. The binary copolymer finishing agent can improve the hydrophilic and moisture-absorbing properties, antibacterial properties, softness, comfort, and skin-friendliness of the polyester fibers. In addition, during the finishing process, the modified profiled polyester fibers are bonded together by non-covalent bonds, forming a strong interaction, which improves the washability of the fabric. 3. The dry and skin-friendly fiber fabric of the present invention has excellent antibacterial properties under the synergistic effect of the quaternary ammonium salt structure, sulfonate betaine structure and Schiff base structure. Sulfonate betaine can reduce the adhesion of bacteria on the surface of the fiber fabric, and Schiff base and quaternary ammonium salt can kill bacteria adhering to the fabric. 4. In addition to high-performance polyester fiber, the dry and skin-friendly fiber fabric of the present invention also includes cotton fiber and mulberry silk fiber. Both cotton fiber and mulberry silk fiber have the advantages of being soft and skin-friendly, moisture-absorbing and breathable, which can quickly remove sweat from the skin and keep the skin dry and comfortable. Moreover, mulberry silk fiber also has antibacterial and anti-mite effects.

[0017] In summary, the dry and skin-friendly fabric of the present invention has excellent antibacterial, moisture-wicking and skin-friendly properties, which can keep the skin dry and provide the wearer with a safe and comfortable wearing experience. It can be used in underwear and other intimate apparel materials. Attached Figure Description

[0018] Figure 1 This is a comparison chart of the water absorption rate tests of the dry and skin-friendly fabrics prepared in Examples 2-4 and Comparative Examples 1-4 of the present invention. Figure 2 This is a comparison chart of the antibacterial rates of Escherichia coli and Staphylococcus aureus (0 washes and 50 washes) of the dry and skin-friendly fabrics prepared in Examples 2-4 and Comparative Examples 1-4 of the present invention. Figure 3 This is a schematic diagram illustrating the synthesis of the diamide diol monomer of the present invention; Figure 4 This is a schematic diagram illustrating the synthesis of the quaternary ammonium salt compound of the present invention; Figure 5 This is a schematic diagram illustrating the synthesis of the intermediate products of this invention; Figure 6 This is a schematic diagram illustrating the synthesis of the sulfonate betaine base compound of the present invention. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0020] Example 1 This embodiment discloses a method for preparing a binary copolymer finishing agent, the specific steps of which are as follows: Step S1: In a nitrogen atmosphere, ethylene glycol and 2-aminobutane-1,4-diol are mixed at a mass ratio of 8:3.5. Then, 1 wt% of 98 wt% concentrated sulfuric acid (1 wt% of the total reaction mixture) is added while stirring at 250 r / min. The mixture is heated to 170°C and reacted for 8 hours. The water generated during the reaction is removed by distillation to obtain the copolyether. The copolyether, epoxybutene, and tetrahydrofuran are mixed at a mass ratio of 10:1.9:80 and stirred at room temperature for 22 hours. After the reaction is complete, the solvent is evaporated to obtain the modified copolyether. Step S2: 6.6g N,N-dimethylethylenediamine and 11.7g 4-hydroxynonenal were added to 150g ethanol and reacted at 65℃ for 3h under a nitrogen atmosphere. After the reaction, the solvent was evaporated to obtain an intermediate product. 17g of the intermediate product was added to 135g tetrahydrofuran and stirred for 30min. Then 9.2g 1,3-propanesulfonyl lactone was added and reacted at 59℃ for 13h. After the reaction, the solvent was evaporated to obtain a sulfonated betaine compound. 13.1g of the sulfonated betaine compound, 4.5g of modified copolyether, and 0.2g ammonium persulfate were added to 175g of a water / methanol mixture and reacted at 70℃ for 24h under a nitrogen atmosphere. After the reaction, the mixture was dialyzed and freeze-dried to obtain a binary copolymer finishing agent. The water / methanol mixture was obtained by mixing water and methanol at a volume ratio of 8:1.

[0021] Example 2 This embodiment discloses a method for preparing a dry and skin-friendly fiber fabric, the specific steps of which are as follows: Step 1: Add 20g of 6-hydroxyhexanoic acid, 28.9g of N-(3-dimethylaminopropyl)-N′-ethylcarbodiimide hydrochloride, and 16.9g of N-hydroxysuccinimide to 300g of N,N-dimethylformamide, stir for 20min, then add 5.1g of 1,5-diaminopentane, and stir at 28℃ for 16h. After the reaction is complete, precipitate the product with diethyl ether, filter, wash, and dry to obtain the diamide diol monomer; add 11.9g of 3-dimethylamino-1,2-propanediol and 27.7g of 1-bromotetradecane to 80g of N,N-dimethylformamide, mix and react at 70℃ for 14h, precipitate the reaction mixture with diethyl ether, filter, and recrystallize with ethanol to obtain the quaternary ammonium salt compound; add 16.5g of diamide diol monomer, 11.1g of isophorone diisocyanate, 0.1g of dibutyltin dilaurate, and 300g of... N,N-dimethylformamide was mixed, heated to 45°C, and stirred for 14 hours. Then, 19.6 g of quaternary ammonium salt compound was added, and the temperature was kept constant. The stirring was continued for 10 hours. After the reaction was completed, the solvent was removed by rotary evaporation. The product was washed with diethyl ether and dried to obtain the antibacterial modified diamide diol monomer. Step 2: Terephthalic acid, ethylene glycol, antibacterial modified diamide diol monomer, and tetrabutyl titanate catalyst are mixed in a mass ratio of 100:20:60:0.02, esterified at 180℃ for 3.5 h, and then melt-polymerized at 255℃ for 2.5 h to obtain modified polyester; the modified polyester and polyester masterbatch are mixed in a mass ratio of 3.5:2 and spun at 230℃ to obtain modified profiled polyester fiber; the spinning is carried out using a profiled spinneret forming method, and the profiled spinneret is a hollow spinneret; Step 3: Add the binary copolymer finishing agent to N,N-dimethylformamide to obtain a finishing solution with a mass fraction of 3%; add the modified profiled polyester fiber to the finishing solution at a bath ratio of 15:1, immerse it at room temperature for 40 minutes, remove it, then cure it at 160℃ for 150 seconds, wash it with water and air dry it to obtain high-performance polyester fiber; blend the high-performance polyester fiber, cotton fiber and mulberry silk fiber at a mass ratio of 50:20:5 to form a composite yarn with an English count of 30S, use the composite yarn as the warp and weft, and knit it to obtain a dry and skin-friendly fiber fabric.

[0022] Example 3 This embodiment discloses a method for preparing a dry and skin-friendly fiber fabric, the specific steps of which are as follows: Step 1: Add 30g of 6-hydroxyhexanoic acid, 43.4g of N-(3-dimethylaminopropyl)-N′-ethylcarbodiimide hydrochloride, and 25.3g of N-hydroxysuccinimide to 400g of N,N-dimethylformamide, stir for 40min, then add 10.2g of 1,5-diaminopentane, and stir at 32℃ for 14h. After the reaction is complete, precipitate the product with diethyl ether, filter, wash, and dry to obtain the diamide diol monomer; add 23.8g of 3-dimethylamino-1,2-propanediol and 55.4g of 1-bromotetradecane to 120g of N,N-dimethylformamide, mix and react at 80℃ for 8h, precipitate the reaction mixture with diethyl ether, filter, and recrystallize with ethanol to obtain the quaternary ammonium salt compound; add 33g of diamide diol monomer, 22.2g of isophorone diisocyanate, 0.3g of dibutyltin dilaurate, and 400g of... N,N-dimethylformamide was mixed, heated to 55°C, and stirred for 10 h. Then 39.2 g of quaternary ammonium salt compound was added, and the temperature was kept constant. The stirring was continued for 14 h. After the reaction was completed, the solvent was removed by rotary evaporation. The product was washed with diethyl ether and dried to obtain the antibacterial modified diamide diol monomer. Step 2: Terephthalic acid, ethylene glycol, antibacterial modified diamide diol monomer, and tetrabutyl titanate catalyst are mixed in a mass ratio of 100:40:80:0.02, esterified at 240℃ for 2.5 h, and then melt-polymerized at 265℃ for 1.5 h to obtain modified polyester; the modified polyester and polyester masterbatch are mixed in a mass ratio of 4.5:2 and spun at 250℃ to obtain modified profiled polyester fiber; the spinning is carried out using a profiled spinneret forming method, and the profiled spinneret is a hollow spinneret; Step 3: Add the binary copolymer finishing agent to N,N-dimethylformamide to obtain a finishing solution with a mass fraction of 5%; add the modified profiled polyester fiber to the finishing solution at a bath ratio of 25:1, immerse it at room temperature for 80 minutes, remove it, then cure it at 170℃ for 120 seconds, wash it with water and air dry it to obtain high-performance polyester fiber; blend the high-performance polyester fiber, cotton fiber and mulberry silk fiber at a mass ratio of 60:30:15 to form a composite yarn with an English count of 40S, use the composite yarn as the warp and weft, and knit it to obtain a dry and skin-friendly fiber fabric.

[0023] Example 4 This embodiment discloses a method for preparing a dry and skin-friendly fiber fabric, the specific steps of which are as follows: Step 1: Add 25g of 6-hydroxyhexanoic acid, 36.2g of N-(3-dimethylaminopropyl)-N′-ethylcarbodiimide hydrochloride, and 21.1g of N-hydroxysuccinimide to 350g of N,N-dimethylformamide, stir for 30min, then add 7.7g of 1,5-diaminopentane, and stir at 30℃ for 15h. After the reaction is complete, precipitate the product with diethyl ether, filter, wash, and dry to obtain the diamide diol monomer; add 17.9g of 3-dimethylamino-1,2-propanediol and 41.6g of 1-bromotetradecane to 100g of N,N-dimethylformamide, mix and react at 75℃ for 11h, precipitate the reaction mixture with diethyl ether, filter, and recrystallize with ethanol to obtain the quaternary ammonium salt compound; add 24.8g of diamide diol monomer, 16.7g of isophorone diisocyanate, 0.2g of dibutyltin dilaurate, and 350g of... N,N-dimethylformamide was mixed, heated to 50°C, and stirred for 12 hours. Then 29.4 g of quaternary ammonium salt compound was added, and the temperature was kept constant. The stirring was continued for another 12 hours. After the reaction was completed, the solvent was removed by rotary evaporation. The product was washed with diethyl ether and dried to obtain the antibacterial modified diamide diol monomer. Step 2: Terephthalic acid, ethylene glycol, antibacterial modified diamide diol monomer, and tetrabutyl titanate catalyst are mixed in a mass ratio of 100:30:70:0.02, esterified at 210℃ for 3 hours, and then melt-polymerized at 260℃ for 2 hours to obtain modified polyester; the modified polyester and polyester masterbatch are mixed in a mass ratio of 4:2 and spun at 240℃ to obtain modified profiled polyester fibers; the spinning is carried out using a shaped spinneret forming method, and the shaped spinneret is a hollow spinneret; Step 3: Add the binary copolymer finishing agent to N,N-dimethylformamide to obtain a finishing solution with a mass fraction of 4%; add the modified profiled polyester fiber to the finishing solution at a bath ratio of 20:1, immerse it at room temperature for 60 minutes, remove it, then cure it at 165℃ for 135 seconds, wash it with water and air dry it to obtain high-performance polyester fiber; blend the high-performance polyester fiber, cotton fiber and mulberry silk fiber at a mass ratio of 55:25:10 to form a composite yarn with an English count of 35S, use the composite yarn as the warp and weft, and knit it to obtain a dry and skin-friendly fiber fabric.

[0024] The binary copolymer finishing agent used in Examples 2-4 above is the binary copolymer finishing agent prepared in Example 1.

[0025] Comparative Example 1 This comparative example discloses a method for preparing a dry and skin-friendly fiber fabric, the specific steps of which are as follows: Step 1: Add 25g of 6-hydroxyhexanoic acid, 36.2g of N-(3-dimethylaminopropyl)-N′-ethylcarbodiimide hydrochloride, and 21.1g of N-hydroxysuccinimide to 350g of N,N-dimethylformamide, stir for 30min, then add 7.7g of 1,5-diaminopentane, and stir at 30℃ for 15h. After the reaction is complete, precipitate the product with diethyl ether, filter, wash, and dry to obtain the diamide diol monomer; add 17.9g of 3-dimethylamino-1,2-propanediol and 41.6g of 1-bromotetradecane to 100g of N,N-dimethylformamide, mix and react at 75℃ for 11h, precipitate the reaction mixture with diethyl ether, filter, and recrystallize with ethanol to obtain the quaternary ammonium salt compound; add 24.8g of diamide diol monomer, 16.7g of isophorone diisocyanate, 0.2g of dibutyltin dilaurate, and 350g of... N,N-dimethylformamide was mixed, heated to 50°C, and stirred for 12 hours. Then 29.4 g of quaternary ammonium salt compound was added, and the temperature was kept constant. The stirring was continued for another 12 hours. After the reaction was completed, the solvent was removed by rotary evaporation. The product was washed with diethyl ether and dried to obtain the antibacterial modified diamide diol monomer. Step 2: Terephthalic acid, ethylene glycol, antibacterial modified diamide diol monomer, and tetrabutyl titanate catalyst are mixed in a mass ratio of 100:30:70:0.02, esterified at 210℃ for 3 hours, and then melt-polymerized at 260℃ for 2 hours to obtain modified polyester; the modified polyester and polyester masterbatch are mixed in a mass ratio of 4:2 and spun at 240℃ to obtain modified profiled polyester fibers; the spinning is carried out using a shaped spinneret forming method, and the shaped spinneret is a hollow spinneret; Step 3: Add the sulfonate betaine base compound prepared in Example 1 to N,N-dimethylformamide to obtain a finishing solution with a mass fraction of 4%; add the modified profiled polyester fiber to the finishing solution at a bath ratio of 20:1, immerse it at room temperature for 60 minutes, remove it, then cure it at 165°C for 135 seconds, wash it with water and air dry it to obtain high-performance polyester fiber; blend the high-performance polyester fiber, cotton fiber and mulberry silk fiber at a mass ratio of 55:25:10 to form a composite yarn with an English count of 35S, use the composite yarn as warp and weft, and knit it to obtain a dry and skin-friendly fiber fabric.

[0026] Comparative Example 2 This comparative example discloses a method for preparing a dry and skin-friendly fiber fabric, the specific steps of which are as follows: Step 1: Add 25g of 6-hydroxyhexanoic acid, 36.2g of N-(3-dimethylaminopropyl)-N′-ethylcarbodiimide hydrochloride, and 21.1g of N-hydroxysuccinimide to 350g of N,N-dimethylformamide, stir for 30min, then add 7.7g of 1,5-diaminopentane, and stir at 30℃ for 15h. After the reaction is complete, precipitate the product with diethyl ether, filter, wash, and dry to obtain the diamide diol monomer; add 17.9g of 3-dimethylamino-1,2-propanediol and 41.6g of 1-bromotetradecane to 100g of N,N-dimethylformamide, mix and react at 75℃ for 11h, precipitate the reaction mixture with diethyl ether, filter, and recrystallize with ethanol to obtain the quaternary ammonium salt compound; add 24.8g of diamide diol monomer, 16.7g of isophorone diisocyanate, 0.2g of dibutyltin dilaurate, and 350g of... N,N-dimethylformamide was mixed, heated to 50°C, and stirred for 12 hours. Then 29.4 g of quaternary ammonium salt compound was added, and the temperature was kept constant. The stirring was continued for another 12 hours. After the reaction was completed, the solvent was removed by rotary evaporation. The product was washed with diethyl ether and dried to obtain the antibacterial modified diamide diol monomer. Step 2: Terephthalic acid, ethylene glycol, antibacterial modified diamide diol monomer, and tetrabutyl titanate catalyst are mixed in a mass ratio of 100:30:70:0.02, esterified at 210℃ for 3 hours, and then melt-polymerized at 260℃ for 2 hours to obtain modified polyester; the modified polyester and polyester masterbatch are mixed in a mass ratio of 4:2 and spun at 240℃ to obtain modified profiled polyester fibers; the spinning is carried out using a shaped spinneret forming method, and the shaped spinneret is a hollow spinneret; Step 3: Add the modified copolyether prepared in Example 1 to N,N-dimethylformamide to obtain a finishing solution with a mass fraction of 4%; add the modified profiled polyester fiber to the finishing solution at a bath ratio of 20:1, immerse it at room temperature for 60 minutes, remove it, then cure it at 165°C for 135 seconds, wash it with water and air dry it to obtain high-performance polyester fiber; blend the high-performance polyester fiber, cotton fiber and mulberry silk fiber at a mass ratio of 55:25:10 to form a composite yarn with an English count of 35S, use the composite yarn as warp and weft, and knit it to obtain a dry and skin-friendly fiber fabric.

[0027] Comparative Example 3 This comparative example discloses a method for preparing a dry and skin-friendly fiber fabric, the specific steps of which are as follows: Step 1: Add 25g of 6-hydroxyhexanoic acid, 36.2g of N-(3-dimethylaminopropyl)-N′-ethylcarbodiimide hydrochloride, and 21.1g of N-hydroxysuccinimide to 350g of N,N-dimethylformamide, stir for 30min, then add 7.7g of 1,5-diaminopentane, and stir the reaction at 30℃ for 15h. After the reaction is complete, precipitate the product with diethyl ether, filter, wash, and dry to obtain the diamide diol monomer; Step 2: Terephthalic acid, ethylene glycol, diamide diol monomer, and tetrabutyl titanate catalyst are mixed in a mass ratio of 100:30:70:0.02, esterified at 210℃ for 3 hours, and then melt-polymerized at 260℃ for 2 hours to obtain modified polyester; the modified polyester and polyester masterbatch are mixed in a mass ratio of 4:2 and spun at 240℃ to obtain modified profiled polyester fibers; the spinning is carried out using a shaped spinneret forming method, and the shaped spinneret is a hollow spinneret; Step 3: Add the binary copolymer finishing agent to N,N-dimethylformamide to obtain a finishing solution with a mass fraction of 4%; add the modified profiled polyester fiber to the finishing solution at a bath ratio of 20:1, immerse it at room temperature for 60 minutes, remove it, then cure it at 165℃ for 135 seconds, wash it with water and air dry it to obtain high-performance polyester fiber; blend the high-performance polyester fiber, cotton fiber and mulberry silk fiber at a mass ratio of 55:25:10 to form a composite yarn with an English count of 35S, use the composite yarn as the warp and weft, and knit it to obtain a dry and skin-friendly fiber fabric.

[0028] Comparative Example 4 This comparative example discloses a method for preparing a dry and skin-friendly fiber fabric, the specific steps of which are as follows: Step 1: The polyester masterbatch is spun at 240°C to obtain modified profiled polyester fibers; the spinning is carried out by a spinning method using a profiled spinneret, and the profiled spinneret is a hollow spinneret. Step 2: Add the binary copolymer finishing agent to N,N-dimethylformamide to obtain a finishing solution with a mass fraction of 4%; add the modified profiled polyester fiber to the finishing solution at a bath ratio of 20:1, immerse it at room temperature for 60 minutes, remove it, then cure it at 165℃ for 135 seconds, wash it with water and air dry it to obtain high-performance polyester fiber; blend the high-performance polyester fiber, cotton fiber and mulberry silk fiber at a mass ratio of 55:25:10 to form a composite yarn with an English count of 35S, use the composite yarn as warp and weft, and knit it to obtain a dry and skin-friendly fiber fabric.

[0029] Experimental Example The performance of the dry and skin-friendly fiber fabrics prepared in Examples 2-4 and Comparative Examples 1-4 was tested.

[0030] I. Moisture absorption test: The test shall be conducted in accordance with GB / T21655.1-2023 "Evaluation of moisture absorption and quick-drying properties of textiles - Part 1: Single combination test method".

[0031] II. Antibacterial performance test: The test standard GB / T20944.3-2008 "Evaluation of antibacterial properties of textiles - Part 3: Shaking method" was adopted, and Escherichia coli and Staphylococcus aureus were selected as the test strains.

[0032] The test results are shown in Table 1:

[0033] As can be seen from the test results in Table 1, the dry and skin-friendly fiber fabrics prepared in Examples 2-4 of the present invention have excellent antibacterial and washability properties, as well as excellent moisture absorption properties, which can keep the skin dry and provide users with a safe and comfortable wearing experience.

[0034] A comparison of Comparative Examples 1-2 and Example 4 shows that the sulfonate betaine compound and the modified copolyether in the binary copolymer finishing agent of the present invention both help improve the hydrophilic and moisture-wicking properties of the fabric, and the sulfonate betaine compound can also improve the antibacterial and wash-resistant properties of the fabric. A comparison of Comparative Examples 3-4 and Example 4 shows that the introduction of amide groups and quaternary ammonium salt groups in the antibacterial modified diamide diol monomer improves the moisture-wicking and antibacterial properties of the fabric. In addition, introducing the antibacterial modified diamide diol monomer into the polyester structure can give the fabric a long-lasting antibacterial effect.

[0035] III. Comfort Performance Evaluation Test: Twenty women aged 20-30 were selected and divided into four groups to evaluate the softness and skin-friendliness of the samples. The evaluation level was divided into 1-5 from low to high. Level 1 represents very poor skin-friendliness, Level 2 represents poor skin-friendliness, Level 3 represents average skin-friendliness, Level 4 represents good skin-friendliness, and Level 5 represents excellent skin-friendliness. The evaluation result was the level that appeared most frequently in each group.

[0036] The test results are shown in Table 2:

[0037] As shown in Table 2, the dry and skin-friendly fabrics prepared in Examples 2-3 of this invention have excellent wearing comfort. A comparison between Comparative Example 1 and Example 4 shows that the copolyether structure in the binary copolymer finishing agent improves the fabric's moisture absorption and softness, thus providing excellent wearing comfort. A comparison between Comparative Example 2 and Example 4 shows that the betaine compound structure in the binary copolymer finishing agent affects the fabric's moisture absorption, thereby improving its wearing comfort. A comparison between Comparative Examples 3-4 and Example 4 shows that the presence of amide groups and quaternary ammonium salt compounds in the antibacterial modified diamide diol monomer enhances the fabric's wearing comfort.

[0038] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method for preparing a dry and skin-friendly fiber fabric, characterized in that, Includes the following steps: Step 1: Using 6-hydroxyhexanoic acid and 1,5-diaminopentane as raw materials, react to prepare a diamide diol monomer; using 3-dimethylamino-1,2-propanediol and 1-bromotetradecane as raw materials, react to prepare a quaternary ammonium salt compound; combine the quaternary ammonium salt compound and the diamide diol monomer through a chemical reaction to prepare an antibacterial modified diamide diol monomer; Step 2: Mix terephthalic acid, ethylene glycol, and antibacterial modified diamide glycol monomer in a mass ratio of 100:(20-40):(60-80):0.02, react, and prepare modified polyester; mix the modified polyester and polyester masterbatch, spin, and prepare modified profiled polyester fibers. Step 3: Impregnate the modified shaped polyester fiber in a finishing solution containing a binary copolymer finishing agent, cure it, and prepare high-performance polyester fiber; blend the high-performance polyester fiber, cotton fiber, and mulberry silk fiber to form a composite yarn, knit it, and prepare a dry and skin-friendly fiber fabric.

2. The method for preparing the dry and skin-friendly fiber fabric according to claim 1, characterized in that, In step one, the preparation method of the antibacterial modified diamide diol monomer specifically includes: mixing 6-hydroxyhexanoic acid, N-(3-dimethylaminopropyl)-N′-ethylcarbodiimide hydrochloride, N-hydroxysuccinimide, N,N-dimethylformamide, and 1,5-diaminopentane in a mass ratio of (20-30):(28.9-43.4):(16.9-25.3):(300-400):(5.1-10.2), stirring and reacting at 28-32℃ for 14-16 h, and purifying to obtain the diamide diol monomer; and mixing 3-dimethylamino-1,2-propanediol, 1-bromotetradecane, and N,N-dimethylformamide in a mass ratio of (11.9-23.8):(27.7-55.4):(80-120). The components are mixed in a specific mass ratio and reacted at 70-80℃ for 8-14 hours. After purification, a quaternary ammonium salt compound is obtained. The diamide diol monomer, isophorone diisocyanate, dibutyltin dilaurate, and N,N-dimethylformamide are mixed, heated to 45-55℃, and stirred for 10-14 hours. Then, the quaternary ammonium salt compound is added, and the temperature is kept constant. The mixture is stirred for another 10-14 hours and purified to obtain an antibacterial modified diamide diol monomer. The mass ratio of the diamide diol monomer, isophorone diisocyanate, dibutyltin dilaurate, N,N-dimethylformamide, and quaternary ammonium salt compound is (16.5-33):(11.1-22.2):(0.1-0.3):(300-400):(19.6-39.2).

3. The method for preparing the dry and skin-friendly fiber fabric according to claim 1, characterized in that, In step two, the method for preparing the modified polyester specifically includes: mixing terephthalic acid, ethylene glycol, antibacterial modified diamide diol monomer, and tetrabutyl titanate, esterifying at 180-240℃ for 2.5-3.5h, and then melt polycondensing at 255-265℃ for 1.5-2.5h to obtain the modified polyester.

4. The method for preparing the dry and skin-friendly fiber fabric according to claim 1, characterized in that, In step two, the mass ratio of the modified polyester to the polyester masterbatch is (3.5-4.5):2; the spinning temperature is 230-250℃; the spinning adopts a spinning method using a shaped spinneret, which is a hollow spinneret.

5. The method for preparing the dry and skin-friendly fiber fabric according to claim 1, characterized in that, In step three, the impregnation conditions are as follows: the modified shaped polyester fiber is added to the finishing solution at a bath ratio of (15-25):1, and impregnated at room temperature for 40-80 minutes, wherein the mass fraction of the binary copolymer finishing agent in the finishing solution is 3-5%; the curing conditions are: curing at 160-170℃ for 120-150 seconds.

6. The method for preparing the dry and skin-friendly fiber fabric according to claim 1, characterized in that, In step three, the mass ratio of the high-performance polyester fiber, cotton fiber, and mulberry silk fiber is (50-60):(20-30):(5-15).

7. The method for preparing the dry and skin-friendly fiber fabric according to claim 1, characterized in that, In step three, the preparation method of the binary copolymer finishing agent specifically includes: Step S1: Mix the copolyether, epoxy butene, and tetrahydrofuran at a mass ratio of 10:(1.2-2.6):80, and stir the mixture at room temperature for 20-24 hours to obtain the modified copolyether. Step S2: N,N-dimethylethylenediamine, 4-hydroxynonenal, and ethanol are mixed in a mass ratio of (4.4-8.8):(7.8-15.6):150 and reacted at 60-70°C for 2.5-3.5 h under a nitrogen atmosphere to obtain an intermediate product. The intermediate product is added to tetrahydrofuran, stirred, and then 1,3-propanesulfonyl lactone is added. The mixture is reacted at 56-62°C for 10-16 h to obtain a sulfonated betaine compound. The intermediate product and tetrahydrofuran are... The mass ratio of 1,3-propanesulfonyl lactone is (11.3-22.6):(120-150):(6.1-12.2); the sulfonated betaine compound, modified copolyether, ammonium persulfate, and water / methanol mixture are mixed in a mass ratio of (8.7-17.4):(3.6-5.4):(0.2-0.3):(150-200), and reacted at 68-72℃ for 22-26 h in a nitrogen atmosphere to obtain a binary copolymer finishing agent.

8. The method for preparing the dry and skin-friendly fiber fabric according to claim 7, characterized in that, In step S1, the preparation method of the copolyether specifically includes: mixing ethylene glycol and 2-aminobutane-1,4-diol in a mass ratio of 8:(2-5) under a nitrogen atmosphere, adding concentrated sulfuric acid accounting for 0.7-1.3 wt% of the total reaction mixture under stirring at a speed of 200-300 r / min, heating to 165-175℃, and reacting for 7-9 h to obtain the copolyether.

9. A dry and skin-friendly fiber fabric prepared by the method for preparing dry and skin-friendly fiber fabric as described in any one of claims 1-8.

10. The application of the dry and skin-friendly fiber fabric according to claim 9 in underwear.

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