Moisture absorption and sweat releasing blended antibacterial fabric and preparation method thereof

Abstract

The invention belongs to the technical field of functional fiber fabrics, and particularly relates to a moisture absorption and sweat releasing blended antibacterial fabric and a preparation method thereof. The preparation method of the moisture-absorbing and sweat-releasing blended antibacterial fabric comprises the following steps: reacting 4, 4 '-biphenol with epoxy chloropropane to prepare a dichlorohydrin ether compound; the preparation method comprises the following steps: reacting triphenylphosphine with a dichlorohydrin ether compound to prepare a double quaternary phosphonium salt compound; the preparation method comprises the following steps: reacting 4, 4 '-diphenylmethane diisocyanate, polytetrahydrofuran ether glycol, polyethylene glycol and a double quaternary phosphonium salt compound in an organic solvent under the action of a catalyst to prepare a polyurethane prepolymer, and carrying out chain extension and neutralization to prepare a polyurethane spinning solution; preparing spandex fibers from the polyurethane spinning solution through a dry spinning process; spandex fibers and China hemp fibers are blended to obtain composite fiber yarns, and then the composite fiber yarns are spun into a fabric to obtain the moisture absorption and sweat releasing blended antibacterial fabric. The fabric not only has excellent moisture absorption and sweat releasing performance and antibacterial performance, but also has good antistatic performance.

Description

Technical Field

[0001] This invention belongs to the field of functional fiber fabric technology, specifically relating to a moisture-wicking blended antibacterial fabric and its preparation method. Background Technology

[0002] With the improvement of people's living standards and the enhancement of health awareness, the functional requirements of textiles are becoming increasingly diversified and high-end. Multifunctional fabrics that combine comfort and hygiene, especially those integrating moisture-wicking, antibacterial, and antistatic functions, have become an important development direction in the textile industry and have broad application prospects in sportswear, outdoor equipment, underwear, medical textiles, and other fields.

[0003] Moisture-wicking properties primarily depend on the hydrophilicity of the fiber and the fabric's structural design. Natural fibers such as cotton and linen offer excellent skin-friendliness and moisture absorption, but their slow moisture wicking speed leads to clinging to the skin after sweating, causing discomfort. Synthetic fibers, especially modified polyesters and polyamides, can achieve rapid moisture wicking through irregular cross-sections and capillary effects, but their skin-friendliness and natural antibacterial properties are insufficient. Hemp fibers, due to their unique cavity structure and abundant hydrophilic groups, possess excellent moisture absorption, breathability, and natural antibacterial properties, but their fibers are relatively coarse and stiff with poor elasticity, resulting in fabrics that feel stiff and limiting comfort. Spandex is widely used to improve fabric comfort and fit due to its excellent elasticity, but conventional spandex fibers have poor moisture absorption and antibacterial / antistatic properties. Applying functional additives such as antibacterial and antistatic agents to fabrics through finishing processes is a common method to impart functionality to textiles, but this method generally suffers from poor functional durability and poor washability.

[0004] To address the aforementioned issues, introducing functional components during the fiber spinning stage has become an effective way to achieve stable and durable functionality. Among these approaches, introducing antibacterial agents into polyurethane spinning solutions through copolymerization or blending to prepare antibacterial spandex has been a research hotspot in recent years. Quaternary phosphonium salts, as cationic antibacterial agents, exhibit superior antibacterial properties compared to traditional quaternary ammonium salts, possessing advantages such as high efficiency, broad spectrum, low toxicity, and good heat resistance. However, the compatibility, dispersion stability, and migration resistance of quaternary phosphonium salts in the polymer matrix directly affect the durability and safety of functional fibers. While aliphatic quaternary phosphonium salts possess high antibacterial activity, their compatibility with polyurethane is generally limited, and their thermal stability in the high-temperature channels of spandex dry spinning is insufficient, leading to easy decomposition and volatilization, resulting in functional loss and environmental pollution. Aromatic quaternary phosphonium salts offer good thermal stability, but their molecular structure has limited compatibility with polyurethane, and they are difficult to firmly anchor to the polymer molecular chain through chemical bonding, still posing a risk of slow migration during long-term use, affecting functional durability.

[0005] Therefore, developing a novel functional aromatic bis-quaternary phosphonium salt that can be chemically bonded to the polyurethane molecular chain, and using it to prepare functional spandex fibers with excellent elasticity, long-lasting antibacterial, antistatic and moisture-wicking properties, and then blending them with natural hemp fibers, is an ideal technical route to solve existing technical problems and obtain high-performance multifunctional fabrics, which has important practical significance and market value. Summary of the Invention

[0006] This invention addresses the shortcomings of existing technologies by providing a moisture-wicking, perspiration-absorbing, and antibacterial blended fabric and its preparation method.

[0007] A method for preparing a moisture-wicking, perspiration-absorbing, and antibacterial blended fabric includes the following steps: Step 1: Add 4,4'-biphenyl hydroquinone, epichlorohydrin and benzyltrimethylammonium chloride to benzene and react. After the reaction is complete, separate and purify to obtain a dichloroethanol ether compound. Step 2: Add triphenylphosphine and dichloroethanol ether compounds to N,N-dimethylformamide (DMF) and react. After the reaction is complete, separate and purify to obtain a bisquaternary phosphonium salt compound. Step 3: Add 4,4'-diphenylmethane diisocyanate (MDI), polytetrahydrofuran ether glycol (PTMEG), polyethylene glycol (PEG), bisquaternary phosphonium salt compound, and dibutyltin dilaurate to N,N-dimethylformamide and react to obtain a polyurethane prepolymer; add dimethylolpropionic acid to the polyurethane prepolymer and continue the reaction. After the reaction is completed, cool and add alkali solution for neutralization to obtain a polyurethane spinning solution. Step 4: The polyurethane spinning solution is used to produce spandex fibers through a dry spinning process. Step 5: Blend spandex fiber with hemp fiber to obtain composite fiber yarn, and then spin the composite fiber yarn into fabric through knitting process to obtain moisture-wicking blended antibacterial fabric.

[0008] Preferably, in step one, the molar ratio of epichlorohydrin to 4,4'-biphenyl is (2.2-2.5):1, the amount of benzyltrimethylammonium chloride added is 2%-4% of the mass of 4,4'-biphenyl, the amount of benzene is 3-5 times the sum of the masses of epichlorohydrin and 4,4'-biphenyl, and the reaction conditions are reflux reaction at 70-90℃ for 4-8 hours under nitrogen protection.

[0009] Preferably, in step two, the molar ratio of triphenylphosphine to dichloroethanol ether compound is (2.2-2.6):1, the amount of N,N-dimethylformamide is 3-5 times the sum of the masses of triphenylphosphine and dichloroethanol ether compound, and the reaction conditions are under nitrogen protection and at 100-120℃ for 18-24 hours.

[0010] Preferably, in step three, when preparing the polyurethane prepolymer, the molar ratio of 4,4'-diphenylmethane diisocyanate, polytetrahydrofuran ether glycol, polyethylene glycol, and bisquaternary phosphonium salt compound is (2-3):(0.8-1.2):(0.6-0.9):(0.4-0.6), the amount of N,N-dimethylformamide is 2-2.5 times the total mass of 4,4'-diphenylmethane diisocyanate, polytetrahydrofuran ether glycol, polyethylene glycol, and bisquaternary phosphonium salt compound, the amount of dibutyltin dilaurate added is 0.2%-0.4% of the total mass of 4,4'-diphenylmethane diisocyanate, polytetrahydrofuran ether glycol, polyethylene glycol, bisquaternary phosphonium salt compound, and N,N-dimethylformamide, and the reaction conditions are 70-80℃ for 2-3 hours.

[0011] Preferably, in step three, the amount of dimethylolpropionic acid added is 6%-8% of the total mass of 4,4'-diphenylmethane diisocyanate, polytetrahydrofuran ether diol, polyethylene glycol, and the bisquaternary phosphonium salt compound, and the reaction is continued at 90-100°C for 3-4 hours.

[0012] Preferably, the alkaline solution comprises an aqueous solution of sodium hydroxide; the concentration of the aqueous solution of sodium hydroxide is 1-2 mol / L.

[0013] Preferably, in step four, during dry spinning, the temperature of the spinning tunnel is 240-260℃ and the spinning speed is 800-1000m / min.

[0014] Preferably, the spandex fiber obtained by dry spinning process has a single filament fineness of 20-40D (denier).

[0015] Preferably, in step five, the mass ratio of spandex fiber to hemp fiber blend is (30-50):(20-40), and the yarn count of the composite fiber yarn is 40-60S (English count); preferably, in step five, the textile process of the moisture-wicking blended antibacterial fabric includes a knitting process, and the weight of the moisture-wicking blended antibacterial fabric is 160-180 g / m². 2 .

[0016] The present invention also discloses a moisture-wicking blended antibacterial fabric prepared by the above-described method for preparing moisture-wicking blended antibacterial fabric.

[0017] Compared with existing technologies, the beneficial effects of this invention are as follows: This invention synthesizes an aromatic bis-quaternary phosphonium salt compound containing two reactive hydroxyl groups. These hydroxyl groups directly participate in the synthesis reaction of polyurethane, attaching to the polyurethane molecular backbone in a strong covalent bond form. This fundamentally solves the problems of easy migration, precipitation, and poor washability of functional additives in traditional physical blending or finishing processes. The resulting spandex fiber embeds antibacterial and antistatic functions within the fiber body, ensuring long-lasting functionality. Compared to aliphatic quaternary phosphonium salts, the aromatic quaternary phosphonium salt structure has higher thermal stability, making the functional quaternary phosphonium salt groups less prone to decomposition and volatilization in the high-temperature tunnel environment of spandex dry spinning, thus maximizing their retention within the fiber. The chemically bonded bis-quaternary phosphonium salt provides a stable and broad-spectrum antibacterial source, resulting in excellent performance of the spandex fiber. The good antibacterial properties, combined with the antibacterial properties of spandex fibers, result in blended fabrics with excellent antibacterial performance. Quaternary phosphonium salt cations integrated into the molecular chain provide a durable conductive pathway, endowing spandex fibers with excellent antistatic properties. This, combined with the antistatic properties of hemp fibers, results in blended fabrics with superior antistatic performance. Introducing hydrophilic polyethylene glycol and the hydrophilic chain extender dimethylolpropionic acid into the polyurethane molecular chain imparts good hydrophilicity to the spandex fibers. The porous cavity structure and hydrophilic groups inherent in hemp fibers further enhance their moisture absorption and wicking capabilities. The porous coil structure formed by the knitting process collectively constructs an efficient moisture absorption-diffusion-evaporation channel, giving the fabric excellent moisture permeability. Furthermore, the increased hydrophilicity of spandex fibers further improves the fabric's antistatic properties. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the reaction for preparing dichloroethanol ether compounds in this invention; Figure 2 This is a schematic diagram of the reaction for preparing bisquaternary phosphonium salt compounds in this 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 moisture-wicking, perspiration-absorbing, and antibacterial blended fabric, including the following steps: Step 1: Add 4,4'-biphenylhydrazine, epichlorohydrin, and benzyltrimethylammonium chloride to benzene. The molar ratio of epichlorohydrin to 4,4'-biphenylhydrazine is 2.2:1. The amount of benzyltrimethylammonium chloride added is 2% of the mass of 4,4'-biphenylhydrazine. The amount of benzene is three times the combined mass of epichlorohydrin and 4,4'-biphenylhydrazine. The reaction is carried out under nitrogen protection and refluxed at 70°C for 8 hours. After the reaction, separation and purification are performed, specifically: the reaction solution is cooled to 0°C in an ice-water bath, filtered, and washed three times with benzene at 0°C. The filtrate and washings are combined to obtain a mixture, which is then washed with 5wt% hydrochloric acid at 0°C to remove the quaternary ammonium salt from the mixture. The catalyst benzyltrimethylammonium chloride was separated into liquid and liquid phases. The washing-separation process was repeated three times. The organic phase was taken and washed with deionized water until the aqueous phase was neutral. Then it was washed once with saturated brine to reduce the water content in the organic phase. Finally, it was dried with anhydrous sodium sulfate and filtered to obtain the purified organic phase. The purified organic phase was rotary evaporated at -0.08 MPa vacuum and 60°C until the liquid volume in the distillation flask no longer decreased significantly. The product was dissolved in 5 times its mass of ethyl acetate, and ethanol at 0°C was slowly added to precipitate crystals until the amount of crystal precipitation no longer increased. The product was filtered and dried in a vacuum drying oven at 30°C to constant weight to obtain the dichloroethanol ether compound. Step 2: Triphenylphosphine and dichloroethanol ether compound were added to N,N-dimethylformamide. The molar ratio of triphenylphosphine to dichloroethanol ether compound was 2.2:1, and the amount of N,N-dimethylformamide was 3 times the sum of the masses of triphenylphosphine and dichloroethanol ether compound. The reaction was carried out under nitrogen protection at 100°C for 24 hours. After the reaction was completed, separation and purification were performed, specifically including: removing the solvent N,N-dimethylformamide by vacuum distillation at 70°C under a vacuum of -0.085 MPa until the fraction was significantly reduced. Ethyl acetate with a mass of 3 times that of the distillate was added to the mixture after vacuum distillation for washing, filtration, and the washing-filtration process was repeated 3 times. The mixture was then dried in a vacuum drying oven at 50°C to constant weight to obtain the bisquaternary phosphonium salt compound. Step 3: Add 4,4'-diphenylmethane diisocyanate, polytetrahydrofuran ether glycol, polyethylene glycol, bisquaternary phosphonium salt compound, and dibutyltin dilaurate to N,N-dimethylformamide. The molar ratio of 4,4'-diphenylmethane diisocyanate, polytetrahydrofuran ether glycol, polyethylene glycol, and bisquaternary phosphonium salt compound is 2:0.8:0.6:0.4. The amount of N,N-dimethylformamide used is twice the sum of the masses of 4,4'-diphenylmethane diisocyanate, polytetrahydrofuran ether glycol, polyethylene glycol, and bisquaternary phosphonium salt compound. The amount of dibutyltin dilaurate added is equal to the mass of 4,4'-diphenylmethane diisocyanate. Isocyanate, polytetrahydrofuran ether glycol, polyethylene glycol, bisquaternary phosphonium salt compound, and N,N-dimethylformamide were reacted at 70°C for 3 hours to obtain a polyurethane prepolymer. Dimethylolpropionic acid was added to the polyurethane prepolymer at 6% of the total mass of 4,4'-diphenylmethane diisocyanate, polytetrahydrofuran ether glycol, polyethylene glycol, and bisquaternary phosphonium salt compound. The mixture was reacted at 90°C for 4 hours. After the reaction was completed, the mixture was cooled and neutralized to a pH of 6.5-7.5 with 1 mol / L sodium hydroxide aqueous solution to obtain a polyurethane spinning solution. Step 4: The polyurethane spinning solution is used to produce spandex fiber through a dry spinning process; wherein, during dry spinning, the temperature of the spinning tunnel is 240℃, the spinning speed is 800m / min, and the single filament fineness of the spandex fiber produced by the dry spinning process is 40D. Step 5: Blend spandex fiber and hemp fiber at a mass ratio of 30:20 to obtain a composite fiber yarn with a yarn count of 40S. Then, knit the composite fiber yarn into fabric to obtain a moisture-wicking blended antibacterial fabric with a weight of 160g / m². 2 .

[0021] Example 2 This embodiment discloses a method for preparing a moisture-wicking, perspiration-absorbing, and antibacterial blended fabric, including the following steps: Step 1: Add 4,4'-biphenyl, epichlorohydrin, and benzyltrimethylammonium chloride to benzene. The molar ratio of epichlorohydrin to 4,4'-biphenyl is 2.5:1. The amount of benzyltrimethylammonium chloride added is 4% of the mass of 4,4'-biphenyl. The amount of benzene is 5 times the sum of the masses of epichlorohydrin and 4,4'-biphenyl. The reaction is carried out under nitrogen protection and refluxed at 90°C for 4 hours. After the reaction is completed, separation and purification are performed. The specific method for separation and purification is the same as in Example 1 to obtain the dichlorohydrin ether compound. Step 2: Triphenylphosphine and dichloroethanol ether compound were added to N,N-dimethylformamide. The molar ratio of triphenylphosphine to dichloroethanol ether compound was 2.6:1, and the amount of N,N-dimethylformamide was 5 times the sum of the masses of triphenylphosphine and dichloroethanol ether compound. The reaction was carried out under nitrogen protection at 120°C for 18 hours. After the reaction was completed, separation and purification were performed. The specific method for separation and purification was the same as in Example 1 to obtain the bisquaternary phosphonium salt compound. Step 3: Add 4,4'-diphenylmethane diisocyanate, polytetrahydrofuran ether glycol, polyethylene glycol, bisquaternary phosphonium salt compound, and dibutyltin dilaurate to N,N-dimethylformamide. The molar ratio of 4,4'-diphenylmethane diisocyanate, polytetrahydrofuran ether glycol, polyethylene glycol, and bisquaternary phosphonium salt compound is 3:1.2:0.9:0.6. The amount of N,N-dimethylformamide is 2.5 times the total mass of 4,4'-diphenylmethane diisocyanate, polytetrahydrofuran ether glycol, polyethylene glycol, and bisquaternary phosphonium salt compound. The amount of dibutyltin dilaurate added is equal to the mass of 4,4'-diphenylmethane diisocyanate. The following ingredients were added: 0.4% by mass of diisocyanate, polytetrahydrofuran ether glycol, polyethylene glycol, bisquaternary phosphonium salt compound, and N,N-dimethylformamide. The mixture was reacted at 80°C for 2 hours to obtain a polyurethane prepolymer. Dimethylolpropionic acid was added to the polyurethane prepolymer at an amount equal to 8% by mass of 4,4'-diphenylmethane diisocyanate, polytetrahydrofuran ether glycol, polyethylene glycol, and bisquaternary phosphonium salt compound. The mixture was reacted at 100°C for 3 hours. After the reaction was completed, the mixture was cooled and neutralized to a pH of 6.5-7.5 by adding 2 mol / L sodium hydroxide aqueous solution to obtain a polyurethane spinning solution. Step 4: The polyurethane spinning solution is used to produce spandex fiber through a dry spinning process; wherein, during dry spinning, the temperature of the spinning tunnel is 260℃, the spinning speed is 1000m / min, and the single filament fineness of the spandex fiber produced by the dry spinning process is 20D. Step 5: Blend spandex fiber and hemp fiber at a mass ratio of 50:40 to obtain a composite fiber yarn with a yarn count of 60S. Then, knit the composite fiber yarn into fabric to obtain a moisture-wicking blended antibacterial fabric with a weight of 180g / m². 2 .

[0022] Example 3 This embodiment discloses a method for preparing a moisture-wicking, perspiration-absorbing, and antibacterial blended fabric, including the following steps: Step 1: Add 4,4'-biphenyl, epichlorohydrin, and benzyltrimethylammonium chloride to benzene. The molar ratio of epichlorohydrin to 4,4'-biphenyl is 2.35:1. The amount of benzyltrimethylammonium chloride added is 3% of the mass of 4,4'-biphenyl. The amount of benzene is 4 times the sum of the masses of epichlorohydrin and 4,4'-biphenyl. The reaction is carried out under nitrogen protection and refluxed at 80°C for 6 hours. After the reaction is completed, separation and purification are performed. The specific method for separation and purification is the same as in Example 1 to obtain the dichlorohydrin ether compound. Step 2: Triphenylphosphine and dichloroethanol ether compound were added to N,N-dimethylformamide. The molar ratio of triphenylphosphine to dichloroethanol ether compound was 2.1:1, and the amount of N,N-dimethylformamide was 4 times the sum of the masses of triphenylphosphine and dichloroethanol ether compound. The reaction was carried out under nitrogen protection at 110°C for 21 hours. After the reaction was completed, separation and purification were performed. The specific method for separation and purification was the same as in Example 1 to obtain the bisquaternary phosphonium salt compound. Step 3: Add 4,4'-diphenylmethane diisocyanate, polytetrahydrofuran ether glycol, polyethylene glycol, bisquaternary phosphonium salt compound, and dibutyltin dilaurate to N,N-dimethylformamide. The molar ratio of 4,4'-diphenylmethane diisocyanate, polytetrahydrofuran ether glycol, polyethylene glycol, and bisquaternary phosphonium salt compound is 2.5:1:0.75:0.5. The amount of N,N-dimethylformamide used is 2.2 times the sum of the masses of 4,4'-diphenylmethane diisocyanate, polytetrahydrofuran ether glycol, polyethylene glycol, and bisquaternary phosphonium salt compound. The amount of dibutyltin dilaurate added is equal to the amount of 4,4'-diphenylmethane diisocyanate. A polyurethane prepolymer was obtained by reacting 4,4'-diphenylmethane diisocyanate, polytetrahydrofuran ether glycol, polyethylene glycol, a bis(quaternary)phosphonium salt compound, and N,N-dimethylformamide at a mass ratio of 0.3% of the total mass. The reaction was carried out at 75°C for 2.5 h. Dimethylolpropionic acid was then added to the polyurethane prepolymer at a mass ratio of 7% of the total mass of 4,4'-diphenylmethane diisocyanate, polytetrahydrofuran ether glycol, polyethylene glycol, and the bis(quaternary)phosphonium salt compound. The reaction was carried out at 95°C for 3.5 h. After the reaction was completed, the mixture was cooled and neutralized to a pH between 6.5 and 7.5 by adding a 1.5 mol / L sodium hydroxide aqueous solution to obtain the polyurethane spinning solution. Step 4: The polyurethane spinning solution is used to produce spandex fiber through a dry spinning process; wherein, during dry spinning, the temperature of the spinning tunnel is 250℃, the spinning speed is 900m / min, and the single filament fineness of the spandex fiber produced by the dry spinning process is 30D. Step 5: Blend spandex fiber and hemp fiber at a mass ratio of 40:30 to obtain a composite fiber yarn with a yarn count of 50S. Then, knit the composite fiber yarn into fabric to obtain a moisture-wicking blended antibacterial fabric with a weight of 170g / m². 2.

[0023] Comparative Example 1 This comparative example discloses a method for preparing a moisture-wicking blended antibacterial fabric, including the following steps: Step 1: Triphenylphosphine and 1,4-bis(chloromethyl)benzene were added to N,N-dimethylformamide, with a molar ratio of triphenylphosphine to 1,4-bis(chloromethyl)benzene of 2.2:1. The amount of N,N-dimethylformamide was three times the sum of the masses of triphenylphosphine and 1,4-bis(chloromethyl)benzene. The reaction was carried out under nitrogen protection at 100°C for 24 hours. After the reaction was completed, separation and purification were performed, specifically including: removing the solvent N,N-dimethylformamide by vacuum distillation at 70°C under a vacuum of -0.085 MPa until the fraction was significantly reduced. Ethyl acetate with a mass three times that of the distillate was added to the mixture after vacuum distillation for washing, filtration, and the washing-filtration process was repeated three times. The mixture was then dried in a vacuum drying oven at 50°C to constant weight to obtain the bisquaternary phosphonium salt compound. Step 2: Add 4,4'-diphenylmethane diisocyanate, polytetrahydrofuran ether glycol, polyethylene glycol, bisquaternary phosphonium salt compound, and dibutyltin dilaurate to N,N-dimethylformamide. The molar ratio of 4,4'-diphenylmethane diisocyanate, polytetrahydrofuran ether glycol, polyethylene glycol, and bisquaternary phosphonium salt compound is 2:0.8:0.6:0.4. The amount of N,N-dimethylformamide is twice the sum of the masses of 4,4'-diphenylmethane diisocyanate, polytetrahydrofuran ether glycol, polyethylene glycol, and bisquaternary phosphonium salt compound. The amount of dibutyltin dilaurate added is equal to the mass of 4,4'-diphenylmethane diisocyanate. Isocyanate, polytetrahydrofuran ether glycol, polyethylene glycol, bisquaternary phosphonium salt compound, and N,N-dimethylformamide were reacted at 70°C for 3 hours to obtain a polyurethane prepolymer. Dimethylolpropionic acid was added to the polyurethane prepolymer at 6% of the total mass of 4,4'-diphenylmethane diisocyanate, polytetrahydrofuran ether glycol, polyethylene glycol, and bisquaternary phosphonium salt compound. The mixture was reacted at 90°C for 4 hours. After the reaction was completed, the mixture was cooled and neutralized to a pH of 6.5-7.5 with 1 mol / L sodium hydroxide aqueous solution to obtain a polyurethane spinning solution. Step 3: The polyurethane spinning solution is used to produce spandex fiber through a dry spinning process; wherein, during dry spinning, the temperature of the spinning tunnel is 240℃, the spinning speed is 800m / min, and the single filament fineness of the spandex fiber produced by the dry spinning process is 40D. Step 4: Blend spandex fiber and hemp fiber at a mass ratio of 30:20 to obtain a composite fiber yarn with a yarn count of 40S. Then, knit the composite fiber yarn into fabric to obtain a moisture-wicking blended antibacterial fabric with a weight of 160g / m².2 .

[0024] Comparative Example 2 This comparative example discloses a method for preparing a moisture-wicking blended antibacterial fabric, including the following steps: Step 1: Add 4,4'-diphenylmethane diisocyanate, polytetrahydrofuran ether glycol, polyethylene glycol, tributylhexylphosphonium bromide, and dibutyltin dilaurate to N,N-dimethylformamide. The molar ratio of 4,4'-diphenylmethane diisocyanate, polytetrahydrofuran ether glycol, polyethylene glycol, and tributylhexylphosphonium bromide is 2:0.8:0.6:0.4. The amount of N,N-dimethylformamide is twice the sum of the masses of 4,4'-diphenylmethane diisocyanate, polytetrahydrofuran ether glycol, polyethylene glycol, and tributylhexylphosphonium bromide. The amount of dibutyltin dilaurate added is equal to the amount of 4,4'-diphenylmethane diisocyanate. 0.2% by mass of 4,4'-diphenylmethane diisocyanate, polytetrahydrofuran ether glycol, polyethylene glycol, tributylhexylphosphonium bromide, and N,N-dimethylformamide were reacted at 70°C for 3 hours to obtain a polyurethane prepolymer. Dimethylolpropionic acid was added to the polyurethane prepolymer at 6% by mass of 4,4'-diphenylmethane diisocyanate, polytetrahydrofuran ether glycol, polyethylene glycol, and tributylhexylphosphonium bromide. The mixture was reacted at 90°C for 4 hours. After the reaction, the mixture was cooled and neutralized to a pH between 6.5 and 7.5 with 1 mol / L sodium hydroxide aqueous solution to obtain a polyurethane spinning solution. Step 2: The polyurethane spinning solution is used to produce spandex fiber through a dry spinning process; wherein, during dry spinning, the temperature of the spinning tunnel is 240℃, the spinning speed is 800m / min, and the single filament fineness of the spandex fiber produced by the dry spinning process is 40D. Step 3: Blend spandex fiber and hemp fiber at a mass ratio of 30:20 to obtain a composite fiber yarn with a yarn count of 40S. Then, knit the composite fiber yarn into fabric to obtain a moisture-wicking blended antibacterial fabric with a weight of 160g / m². 2 .

[0025] Comparative Example 3 This comparative example discloses a method for preparing a moisture-wicking blended antibacterial fabric, including the following steps: Step 1: Add 4,4'-biphenyl, epichlorohydrin, and benzyltrimethylammonium chloride to benzene. The molar ratio of epichlorohydrin to 4,4'-biphenyl is 2.2:1. The amount of benzyltrimethylammonium chloride added is 2% of the mass of 4,4'-biphenyl. The amount of benzene is 3 times the sum of the masses of epichlorohydrin and 4,4'-biphenyl. The reaction is carried out under nitrogen protection and refluxed at 70°C for 8 hours. After the reaction is completed, separation and purification are performed. The specific method for separation and purification is the same as in Example 1 to obtain the dichlorohydrin ether compound. Step 2: Triphenylphosphine and dichloroethanol ether compound were added to N,N-dimethylformamide. The molar ratio of triphenylphosphine to dichloroethanol ether compound was 2.2:1. The amount of N,N-dimethylformamide was 3 times the sum of the masses of triphenylphosphine and dichloroethanol ether compound. The reaction was carried out under nitrogen protection at 100°C for 24 hours. After the reaction was completed, separation and purification were performed. The specific method for separation and purification was the same as in Example 1 to obtain the bisquaternary phosphonium salt compound. Step 3: Add 4,4'-diphenylmethane diisocyanate, polytetrahydrofuran ether glycol, polyethylene glycol, bisquaternary phosphonium salt compound, and dibutyltin dilaurate to N,N-dimethylformamide. The molar ratio of 4,4'-diphenylmethane diisocyanate, polytetrahydrofuran ether glycol, polyethylene glycol, and bisquaternary phosphonium salt compound is 2:0.8:0.6:0.4. The amount of N,N-dimethylformamide used is twice the sum of the masses of 4,4'-diphenylmethane diisocyanate, polytetrahydrofuran ether glycol, polyethylene glycol, and bisquaternary phosphonium salt compound. Dibutyltin dilaurate... The amount of 4,4'-diphenylmethane diisocyanate, polytetrahydrofuran ether glycol, polyethylene glycol, bisquaternary phosphonium salt compound, and N,N-dimethylformamide added was 0.2% by mass. The mixture was reacted at 70°C for 3 hours to obtain a polyurethane prepolymer. 1,4-Butanediol was added to the polyurethane prepolymer at an amount of 4% by mass of 4,4'-diphenylmethane diisocyanate, polytetrahydrofuran ether glycol, polyethylene glycol, and bisquaternary phosphonium salt compound. The mixture was reacted at 90°C for 4 hours. After the reaction was completed, the mixture was cooled to obtain a polyurethane spinning solution. Step 4: The polyurethane spinning solution is used to produce spandex fiber through a dry spinning process; wherein, during dry spinning, the temperature of the spinning tunnel is 240℃, the spinning speed is 800m / min, and the single filament fineness of the spandex fiber produced by the dry spinning process is 40D. Step 5: Blend spandex fiber and hemp fiber at a mass ratio of 30:20 to obtain a composite fiber yarn with a yarn count of 40S. Then, knit the composite fiber yarn into fabric to obtain a moisture-wicking blended antibacterial fabric with a weight of 160g / m². 2 .

[0026] In the above examples and comparative examples, the polytetrahydrofuran ether glycol was PTMEG2000 with an average molecular weight of 2000; the polyethylene glycol was PEG1000 with an average molecular weight of 1000.

[0027] Test case The performance of the moisture-wicking blended antibacterial fabric samples prepared in Examples 1-3 and Comparative Examples 1-3 was determined: (1) Moisture permeability: The moisture permeability of the fabric samples was determined in accordance with the standard GB / T12704.1-2009 "Textiles - Test Methods for Moisture Permeability of Fabrics - Part 1: Moisture Absorption Method". The results of the moisture permeability test are shown in Table 1.

[0028] As shown in Table 1, the moisture-wicking blended antibacterial fabric prepared in this invention has good moisture permeability, thus exhibiting excellent moisture-wicking properties. The introduction of the hydrophilic diol polyethylene glycol effectively improves the hydrophilicity of polyurethane, thereby enhancing the moisture absorption performance of spandex fibers. Similarly, the introduction of hydrophilic carboxyl groups through the hydrophilic chain extender dimethylolpropionic acid further improves the hydrophilicity of polyurethane, thereby further enhancing the moisture absorption performance of spandex fibers. Hemp fiber molecules contain a large number of polar hydrophilic groups, and the fiber center has a large cavity with many longitudinally connected fissures and pores, giving the fiber numerous capillary channels that can rapidly transfer and diffuse moisture and water vapor within the fabric. This synergistic effect with the moisture-wicking spandex fibers results in a blended fabric with excellent moisture-wicking properties. Furthermore, the composite fiber yarn obtained by blending spandex and hemp fibers is spun into fabric through a knitting process. The loop structure naturally forms numerous breathable pores, allowing air and moisture to easily pass through, further improving the fabric's moisture-wicking performance. Compared with Example 1, in Comparative Example 3, the chain extender was replaced by 1,4-butanediol instead of dimethylolpropionic acid, which reduced the hydrophilicity of the spandex fiber and significantly reduced the moisture permeability of the fabric.

[0029] (2) Antibacterial properties: The antibacterial effect of the fabric samples against Staphylococcus aureus and Escherichia coli was determined according to the standard FZ / T73023-2006 "Antibacterial Knitted Fabrics". The test results are shown in Table 2.

[0030] As shown in Table 2, the moisture-wicking blended antibacterial fabric prepared in this invention exhibits excellent antibacterial properties. During the preparation of spandex fibers, a bisquaternary phosphonium salt compound with antibacterial properties was introduced. This compound contains hydroxyl groups, allowing it to react with diisocyanates and attach to the polyurethane molecular chain, thus stabilizing the antibacterial properties of the spandex fibers. Hemp fibers possess excellent natural antibacterial properties, which synergistically work with the antibacterial spandex fibers to produce a blended fabric with superior antibacterial performance. Compared to Example 1, in Comparative Example 1, the bisquaternary phosphonium salt compound does not contain hydroxyl groups and cannot bond to the polyurethane molecular chain, resulting in decreased dispersibility in the polyurethane spinning solution and a decline in antibacterial performance. In Comparative Example 2, the quaternary phosphonium salt is an aliphatic quaternary phosphonium salt, which, compared to aromatic quaternary phosphonium salts, has decreased thermal stability and is prone to decomposition and release during dry spinning, leading to a decrease in antibacterial performance.

[0031] (3) Antistatic properties: Reference standard: The antistatic properties of the fabric samples were determined according to GB / T12703.2-2009 "Evaluation of electrostatic properties of textiles - Part 2: Surface charge density". The results of the surface charge density determination are shown in Table 3.

[0032] As shown in Table 3, the moisture-wicking blended antibacterial fabric prepared in this invention has good antistatic properties. During the preparation of spandex fibers, a bis-quaternary phosphonium salt compound with antistatic properties was introduced. This compound contains hydroxyl groups, which can react with diisocyanate to connect to the polyurethane molecular chain, thus stabilizing the antistatic properties of the spandex fibers. Hemp fibers also possess good antistatic properties, and their synergistic effect with the antistatic spandex fibers results in a blended fabric with excellent antistatic properties. Compared with Example 1, in Comparative Example 1, the bisquaternary phosphonium salt compound does not contain hydroxyl groups and cannot be bonded to the polyurethane molecular chain, resulting in decreased dispersibility in the polyurethane spinning solution and a decrease in antistatic properties. In Comparative Example 2, the quaternary phosphonium salt is an aliphatic quaternary phosphonium salt, which has decreased thermal stability compared to aromatic quaternary phosphonium salts. It is prone to decomposition and release during the dry spinning process, leading to a decrease in antistatic properties. In Comparative Example 3, the chain extender was replaced by 1,4-butanediol, which reduced the hydrophilicity of the spandex fiber and also reduced the antistatic properties of the fabric.

[0033] 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 moisture-wicking, perspiration-absorbing, blended antibacterial fabric, characterized in that, Includes the following steps: Step 1: Add 4,4'-biphenyl hydroquinone, epichlorohydrin and benzyltrimethylammonium chloride to benzene and react. After the reaction is complete, separate and purify to obtain a dichloroethanol ether compound. Step 2: Add triphenylphosphine and dichloroethanol ether compounds to N,N-dimethylformamide and react. After the reaction is complete, separate and purify to obtain the bisquaternary phosphonium salt compound. Step 3: Add 4,4'-diphenylmethane diisocyanate, polytetrahydrofuran ether diol, polyethylene glycol, bisquaternary phosphonium salt compound, and dibutyltin dilaurate to N,N-dimethylformamide and react to obtain a polyurethane prepolymer; add dimethylolpropionic acid to the polyurethane prepolymer and continue the reaction. After the reaction is completed, cool and add alkali solution for neutralization to obtain a polyurethane spinning solution. Step 4: The polyurethane spinning solution is used to produce spandex fibers through a dry spinning process. Step 5: Blend spandex fiber with hemp fiber to obtain composite fiber yarn, and then spin the composite fiber yarn into fabric through knitting process to obtain moisture-wicking blended antibacterial fabric.

2. The method for preparing a moisture-wicking, perspiration-absorbing blended antibacterial fabric according to claim 1, characterized in that, In step one, the molar ratio of epichlorohydrin to 4,4'-biphenyl is (2.2-2.5):1, the amount of benzyltrimethylammonium chloride added is 2%-4% of the mass of 4,4'-biphenyl, the amount of benzene is 3-5 times the sum of the masses of epichlorohydrin and 4,4'-biphenyl, and the reaction conditions are reflux reaction at 70-90℃ for 4-8 hours under nitrogen protection.

3. The method for preparing a moisture-wicking, perspiration-absorbing, and antibacterial blended fabric according to claim 1, characterized in that, In step two, the molar ratio of triphenylphosphine to dichloroethanol ether compound is (2.2-2.6):1, the amount of N,N-dimethylformamide is 3-5 times the sum of the masses of triphenylphosphine and dichloroethanol ether compound, and the reaction conditions are under nitrogen protection and at 100-120℃ for 18-24 hours.

4. The method for preparing a moisture-wicking, perspiration-absorbing blended antibacterial fabric according to claim 1, characterized in that, In step three, when preparing the polyurethane prepolymer, the molar ratio of 4,4'-diphenylmethane diisocyanate, polytetrahydrofuran ether glycol, polyethylene glycol, and bisquaternary phosphonium salt compound is (2-3):(0.8-1.2):(0.6-0.9):(0.4-0.6). The amount of N,N-dimethylformamide is 2-2.5 times the total mass of 4,4'-diphenylmethane diisocyanate, polytetrahydrofuran ether glycol, polyethylene glycol, and bisquaternary phosphonium salt compound. The amount of dibutyltin dilaurate added is 0.2%-0.4% of the total mass of 4,4'-diphenylmethane diisocyanate, polytetrahydrofuran ether glycol, polyethylene glycol, bisquaternary phosphonium salt compound, and N,N-dimethylformamide. The reaction conditions are: reaction at 70-80℃ for 2-3 hours.

5. The method for preparing a moisture-wicking, perspiration-wicking blended antibacterial fabric according to claim 1, characterized in that, In step three, the amount of dimethylolpropionic acid added is 6%-8% of the total mass of 4,4'-diphenylmethane diisocyanate, polytetrahydrofuran ether diol, polyethylene glycol, and the bisquaternary phosphonium salt compound. The reaction is continued at 90-100°C for 3-4 hours.

6. The method for preparing a moisture-wicking blended antibacterial fabric according to claim 1, characterized in that, In step four, during dry spinning, the temperature of the spinning tunnel is 240-260℃, and the spinning speed is 800-1000m / min.

7. The method for preparing a moisture-wicking, perspiration-absorbing blended antibacterial fabric according to claim 1, characterized in that, In step four, the spandex fiber obtained by dry spinning has a single filament fineness of 20-40D.

8. The method for preparing a moisture-wicking, perspiration-wicking blended antibacterial fabric according to claim 1, characterized in that, In step five, the mass ratio of spandex fiber to hemp fiber blend is (30-50):(20-40), and the yarn count of the composite fiber yarn is 40-60S.

9. The method for preparing a moisture-wicking blended antibacterial fabric according to claim 1, characterized in that, In step five, the textile process of the moisture-wicking blended antibacterial fabric includes a knitting process, and the weight of the moisture-wicking blended antibacterial fabric is 160-180 g / m². 2 .

10. A moisture-wicking blended antibacterial fabric prepared by the method described in any one of claims 1-9.

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