Preparation method of perspiration and warm-keeping composite fiber blended knitted fabric

Abstract

The invention discloses a preparation method of a sweat-releasing and warm-keeping composite fiber blended knitted fabric, belongs to the technical field of fabric processing, and is used for solving the technical problem that the sweat-releasing and warm-keeping performance and the antibacterial performance of a cotton-containing warm-keeping knitted fabric in the prior art need to be further improved. The method comprises the following steps that pure cotton hollow yarn serves as a raw material, hydrophobic modification is conducted on the pure cotton hollow yarn, modified hollow cotton yarn is prepared, modified polyester fiber serves as a raw material, blending is conducted, and the modified polyester yarn with the linear density of 18-19 Tex is prepared. The moisture absorption performance and the quick-drying performance of the knitted fabric are effectively improved, the knitted fabric shows good perspiration and heat preservation performance, and the antibacterial performance of the knitted fabric is effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of fabric processing, and in particular to a method for preparing a sweat-wicking and warm-keeping composite fiber blended knitted fabric. Background Art

[0002] In the field of textiles and clothing, with the improvement of people's quality of life and the enhancement of health awareness, the requirements for home clothing, especially pajamas fabrics, are becoming increasingly stringent. Traditional pure cotton fiber fabrics are deeply loved by consumers for their natural, breathable and skin-friendly properties, but they have obvious deficiencies in sweat-wicking, warmth-keeping and antibacterial properties. These deficiencies are particularly prominent, especially in a warm and humid sleeping environment.

[0003] In the prior art, when pure cotton yarn is used as the basis for textile production, the warmth retention of pure cotton fabric mainly depends on its thickness and density, which sacrifices the lightness and wearing comfort of the fabric to a certain extent. Especially in the autumn and winter seasons, pure cotton pajamas are difficult to meet the high requirements for warmth retention performance. Pajamas are close-fitting clothing, and their antibacterial properties are directly related to the skin health of the wearer. Pure cotton fibers themselves do not have antibacterial functions. During sleep, the human body secretes sweat and sebum, which provide a breeding ground for bacteria. After long-term wearing and washing, bacteria are easily bred, affecting the health of the wearer. Cotton fiber fabrics have poor perspiration performance, and are prone to sweat accumulation on the skin surface in a high humidity environment, causing discomfort and even affecting sleep quality.

[0004] In view of the technical defects in this aspect, a solution is now proposed. Summary of the invention

[0005] The purpose of the present invention is to provide a method for preparing a sweat-wicking and heat-retaining composite fiber blended knitted fabric, which is used to solve the technical problem in the prior art that the sweat-wicking and heat-retaining performance and antibacterial performance of the cotton-containing heat-retaining knitted fabric need to be further improved.

[0006] The purpose of the present invention can be achieved by the following technical scheme: A method for preparing a sweat-wicking and heat-retaining composite fiber blended knitted fabric comprises the following steps:

[0007] S1. Using pure cotton hollow yarn as raw material, hydrophobically modifying it to prepare modified hollow cotton yarn;

[0008] S2, using modified polyester fiber as raw material for blending to prepare modified polyester yarn with a linear density of 18-19Tex;

[0009] S3. Using modified hollow cotton yarn and modified polyester yarn as textile raw materials, the two yarns are interwoven through a circular knitting machine to prepare weft knitted fabrics.

[0010] Furthermore, in step S1, the preparation method of the modified hollow cotton yarn is: completely immerse the pure cotton hollow yarn in a sodium hydroxide solution at a temperature of 75-85°C, keep it warm for 15-20 minutes, remove it from the sodium hydroxide solution and transfer it to a hydrophobic modification liquid, increase the temperature of the hydrophobic modification liquid to 60-70°C, keep it warm for 30-40 minutes, and post-treat to obtain the modified hollow cotton yarn.

[0011] The synthetic reaction mechanism of modified hollow cotton yarn is:

[0012] The pure cotton hollow yarn is treated with alkali solution to destroy the hydrogen bonds between cellulose molecules, reduce the crystallinity of cellulose, swell the fiber, make the surface rough, and increase the specific surface area of ​​the fiber. The pure cotton hollow yarn is surface modified by octyltrimethoxysilane. The long-chain alkyl in the octyltrimethoxysilane molecule is gradually grafted onto the cellulose molecular chain, covering the surface of the fiber, thereby giving the fiber hydrophobic properties to prepare modified hollow cotton yarn.

[0013] Furthermore, the dosage ratio of the pure cotton hollow yarn, the sodium hydroxide solution, and the hydrophobic modification liquid is 1g:10mL:5mL, the concentration of the sodium hydroxide solution is 0.3-0.5mol / L, and the hydrophobic modification liquid is composed of octyltrimethoxysilane, anhydrous ethanol and purified water in a dosage ratio of 1g:8mL:2mL. The post-treatment includes: after the insulation treatment is completed, the yarn is washed with purified water to neutrality, and then dried at room temperature to obtain modified hollow cotton yarn.

[0014] Further, in step S2, the modified polyester fiber is obtained by processing the following steps:

[0015] A1, adding bis(hydroxyethyl) terephthalate, terephthalic acid, ethylene glycol and a catalyst into a nitrogen-protected reactor and stirring, raising the temperature of the reactor to 170-180° C., and keeping the temperature for reaction for 6-8 hours, adding sodium diethylene glycol isophthalate-5-sulfonate and modified menthol into the reactor, raising the temperature of the reactor to 240-260° C., keeping the temperature for stirring for 10-15 minutes, evacuating the reactor to a vacuum pressure of 20-60 Pa, raising the temperature of the reactor to 260-280° C., keeping the temperature for stirring for 3-5 hours, discharging while hot, cooling and solidifying, slicing, and drying to obtain a modified polyester;

[0016] The synthetic reaction formula of modified polyester is:

[0017]

[0018] Where:

[0019]

[0020] The synthetic reaction mechanism of modified polyester is:

[0021] The carboxyl groups on dihydroxyethyl terephthalate and terephthalic acid molecules and the alcoholic hydroxyl groups on ethylene glycol molecules undergo esterification reaction under the action of a catalyst to generate ester bonds. As the reaction proceeds, polyester segments with different lengths and structures are formed. Sodium diethylene glycol 5-sulfonate and modified menthol as comonomers undergo ester exchange reaction with polyester under the action of high temperature to prepare modified polyester containing sodium diethylene glycol 5-sulfonate and modified menthol co-block segments.

[0022] A2, adding modified polyester, polyethylene glycol 4000, modified nano zinc oxide and auxiliary additives into a twin-screw extruder, melt-extruded into a spinning machine through the twin-screw extruder, and heat-stretched after melt spinning to obtain a modified polyester fiber precursor;

[0023] A3. Add the modified polyester fiber precursor and purified water into a reactor, raise the temperature of the reactor to 70-80°C, and steam for 60-80 minutes. Take out the fiber from the reactor, wash it 3 times with purified water, drain it, and air-dry it to obtain the modified polyester fiber.

[0024] Furthermore, in step A1, the weight ratio of dihydroxyethyl terephthalate, terephthalic acid, ethylene glycol, catalyst, sodium diethylene glycol 5-sulfonate isophthalate and modified menthol is 5:7:7:0.1:5:3, and the catalyst is composed of cobalt acetate and antimony trioxide in a weight ratio of 1:3.

[0025] Furthermore, in step A2, the weight ratio of the modified polyester, polyethylene glycol 4000, modified nano zinc oxide and auxiliary additives is 50:20:3:5, the auxiliary additives are composed of an antioxidant, a dispersant, a lubricant and a plasticizer in a weight ratio of 2:3:1:2, the antioxidant is antioxidant 1010, the dispersant is stearate, the lubricant is castor oil, and the plasticizer is phthalate. The temperatures of the six temperature sections of the twin-screw extruder from the feed end to the discharge end are 280°C, 285°C, 295°C, 295°C, 295°C, and 300°C, respectively. The screw speed of the twin-screw extruder is 39r / min, the spinning temperature of the spinning machine is 310-315°C, the aperture of the spinneret is 0.15-0.3mm, the hot stretching temperature is 180-200°C, and the stretching ratio is 3 times.

[0026] Furthermore, in step A3, the usage ratio of the modified polyester fiber precursor and purified water is 1 g:10 mL.

[0027] Further, the modified menthol is processed by the following steps:

[0028] B1, adding menthol, dichloromethane and cyanuric chloride into a reaction kettle and stirring until the system is dissolved, adding triethylamine into the reaction kettle, keeping the reaction at room temperature for 10-12h, and post-treating to obtain intermediate I;

[0029] The synthetic reaction formula of intermediate I is:

[0030]

[0031] The synthetic reaction mechanism of intermediate I is:

[0032] Using triethylamine as an alkaline reaction environment, the hydroxyl group on the menthol molecule and the alkyl halide on the cyanuric chloride molecule undergo a nucleophilic substitution reaction to prepare intermediate I;

[0033] The mass spectrometry analysis data of intermediate I are: m / z: 303.0905 (100.0%), 305.0876 (63.9%), 304.0939 (14.1%), 307.0846 (10.2%), 306.0909 (9.0%), 308.0880 (1.4%), 304.0876 (1.1%); elemental analysis: C, 51.33; H, 6.30; Cl, ​​23.31; N, 13.81; O, 5.26.

[0034] B2. Add intermediate I, methyl 4-aminobutyrate and ethylene dichloride into a reactor and stir until the system is dissolved. Add sodium carbonate into the reactor, increase the temperature of the reactor to 75-80° C., keep the temperature for 8-10 hours, and perform post-treatment to obtain modified menthol.

[0035] The synthetic reaction formula of modified menthol is:

[0036]

[0037] The synthetic reaction mechanism of modified menthol is:

[0038] Sodium carbonate is partially hydrolyzed in water to generate hydroxide ions to keep the reaction system alkaline. Under alkaline conditions, the alkyl halide on the intermediate I molecule undergoes a nucleophilic substitution reaction with the amino group on the 4-aminobutyric acid methyl ester molecule to prepare a modified menthol having a dibutyric acid methyl ester modified intermediate I;

[0039] The mass spectrometry analysis data of modified menthol are: m / z: 465.2951 (100.0%), 466.2985 (24.9%), 467.3018 (3.0%), 466.2922 (1.8%), 467.2994 (1.0%); elemental analysis: C, 59.33; H, 8.44; N, 15.04; O, 17.18.

[0040] Furthermore, the preparation method of modified nano zinc oxide is: adding nano zinc oxide, KH-540 and anhydrous ethanol into a reactor and stirring, raising the temperature of the reactor to 45-55° C., adding alkali solution into the reactor, keeping the temperature for 90-120 minutes, and post-treating to obtain modified nano zinc oxide.

[0041] Furthermore, the dosage ratio of the nano zinc oxide, KH-540, anhydrous ethanol and alkali solution is 5g:2g:30mL:10mL, the alkali solution is 0.5mol / L sodium hydroxide solution, and the post-treatment includes: after the reaction is completed, the temperature of the reactor is lowered to room temperature, filtered, the filter cake is washed with purified water until it is neutral and then dried, the filter cake is transferred to a drying oven at a temperature of 60-70°C, and hollow dried to constant weight to obtain modified nano zinc oxide.

[0042] The synthetic reaction mechanism of modified nano zinc oxide is:

[0043] Under alkaline conditions, the siloxane bonds on KH-540 are hydrolyzed to form active silanol groups, which react with active groups on the surface of the nano-zinc oxide particles to coat and modify the outside of the nano-zinc oxide particles with KH-540, thereby preparing modified nano-zinc oxide particles modified with KH-540.

[0044] Furthermore, in step B1, the dosage ratio of menthol and cyanuric chloride is 1 mol:1 mol, and the dosage ratio of menthol, dichloromethane and triethylamine is 1 g:10 mL:0.5 g. The post-treatment includes: after the reaction is completed, adding purified water to the reactor, washing 3 times, drying the organic phase over anhydrous magnesium sulfate for 40 min, transferring the organic phase to a reactor at a temperature of 60° C., and removing the solvent under reduced pressure to obtain intermediate I.

[0045] Furthermore, in step B2, the ratio of the intermediate I to methyl 4-aminobutyrate is 1 mol:3 mol, the ratio of the intermediate I to ethylene dichloride and sodium carbonate is 1 g:10 mL:0.5 g, and the post-treatment includes: after the reaction is completed, the temperature of the reactor is lowered to room temperature, purified water is added to the reactor, and the reactor is washed three times, the organic phase is dried over anhydrous magnesium sulfate for 40 min, and then transferred to a reactor at a temperature of 70-80 ° C, and distilled under reduced pressure until no liquid is extracted to obtain modified menthol.

[0046] Furthermore, in step S3, the paths for feeding the yarn into the loop forming system of the circular knitting machine are as follows: the odd-numbered paths are used to feed the modified hollow cotton yarn, and the other paths are used to feed the modified polyester yarn.

[0047] The present invention has the following beneficial effects:

[0048] 1. The sweat-wicking and heat-retaining composite fiber blended knitted fabric of the present invention is prepared by using pure cotton yarn as a raw material to perform hydrophobic modification on it, enhancing the hydrophobic property of hollow cotton yarn, and preparing modified hollow cotton yarn. Then, modified polyester containing sodium diethylene glycol isophthalate-5-sulfonate and modified menthol co-blocked segments, polyethylene glycol 4000, and modified nano zinc oxide modified by KH-540 are used as raw materials to prepare moisture-absorbing and quick-drying modified polyester fibers, and the modified hollow cotton yarn and the modified hollow cotton yarn are used as raw materials for spinning to prepare knitted fabrics. The hollow cotton yarn can retain more air due to its hollow structure inside, forming a The hydrophobic modification does not change the hollow structure inside the knitted fabric, so that its thermal insulation performance is basically maintained. The modified polyester fiber can absorb moisture and diffuse rapidly inside the fiber or in the gaps between fibers. It is conducted to the outer surface of the fabric through the capillary effect, and the humidity difference with the outside air is used to promote rapid evaporation of moisture to achieve a quick-drying effect. The surface properties of the hollow cotton yarn after hydrophobic modification are changed, the affinity for water is reduced, and the residence time of moisture on the fiber surface is reduced, further improving the perspiration and thermal insulation properties of the knitted fabric.

[0049] 2. The sweat-wicking and heat-retaining composite fiber blended knitted fabric of the present invention is prepared by embedding sodium diethylene glycol 5-sulfonate isophthalate and modified menthol blocks in modified polyester molecular chains. The modified sulfonic acid groups in the molecular chains are hydrophilic. When the fibers come into contact with water molecules, the sulfonic acid groups can form hydrogen bonds with the water molecules, thereby accelerating the absorption and diffusion of water, thereby increasing the hygroscopicity of the polyester fibers. The capillary effect of the polyester fibers themselves enables water to be quickly conducted to the outside of the fabric, thereby improving the quick-drying performance of the fabric. Menthol itself has certain antibacterial properties. Menthol is used as a raw material and modified, and then the menthol is modified on the polyester molecular chain, which can improve the antibacterial properties of the modified polyester.

[0050] 3. The sweat-wicking and heat-retaining composite fiber blended knitted fabric of the present invention is prepared by mixing modified polyester, polyethylene glycol 4000, modified nano zinc oxide and auxiliary additives and then performing melt spinning. Polyethylene glycol 4000 is mixed with modified polyester as an auxiliary agent, which helps to improve the processing performance of the fiber. The high-temperature melt spinning and heat stretching process helps to orient and crystallize the fiber, forming a tighter fiber structure. Then, additives such as polyethylene glycol 4000 are removed by steaming, so that the pore structure inside the fiber is clearer, the rapid diffusion and evaporation of water are promoted, the fiber surface is made more hydrophilic, and the moisture absorption and quick-drying are further improved. Performance, nano zinc oxide is a broad-spectrum antibacterial material. By modifying it, the KH-540 modified on its surface can be compatible with organic polymer materials such as polyester, thereby improving the dispersibility and compatibility of nano zinc oxide in the polyester matrix, preventing the agglomeration and precipitation of nano particles, thereby improving the ability of nano zinc oxide to continuously and evenly release antibacterial substances and maintain the lasting antibacterial properties of the fiber. The modified menthol is combined with nano zinc oxide to form a multi-level antibacterial defense line in the modified polyester, which has a stronger killing and inhibitory effect on different types of bacteria and improves the antibacterial properties of the modified polyester fiber. DETAILED DESCRIPTION

[0051] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0052] In the present application, the pure cotton hollow yarn is selected from Shandong Huamian Yarn Co., Ltd., the twist is neutral twist TPM, the yarn count is 26 34*2Ne cone yarn, and the linear density is 18.2Tex.

[0053] Example 1

[0054] This embodiment provides a method for preparing a sweat-wicking and heat-retaining composite fiber blended knitted fabric, comprising the following steps:

[0055] S1. Preparation of modified hollow cotton yarn

[0056] Octyltrimethoxysilane, anhydrous ethanol and purified water were mixed uniformly in a dosage ratio of 1 g: 8 mL: 2 mL to obtain a hydrophobic modified liquid;

[0057] Pure cotton hollow yarn and 0.3 mol / L sodium hydroxide solution were added into the reactor at a ratio of 1 g:10 mL, and the reactor temperature was raised to 75°C, and the mixture was kept warm for 15 min. The yarn was removed from the reactor and drained.

[0058] The drained pure cotton hollow yarn and the hydrophobic modification liquid were added into the reactor at a ratio of 1 g:2 mL. The temperature of the reactor was raised to 60°C and kept warm for 30 minutes. The yarn was washed with purified water until neutral and then dried at room temperature to obtain modified hollow cotton yarn.

[0059] S2. Preparation of modified menthol

[0060] Weigh: 15.6 g of menthol, 156 mL of dichloromethane, and 18.4 g of cyanuric chloride, add them into a reactor and stir until the system is dissolved, add 7.8 g of triethylamine into the reactor, keep the reaction at room temperature for 10 h, add 100 mL of purified water into the reactor, wash three times, dry the organic phase over anhydrous magnesium sulfate for 40 min, transfer it to a reactor at 60° C., evaporate the solvent under reduced pressure to obtain intermediate I;

[0061] Weigh: 30.4 g of intermediate I, 35.1 g of methyl 4-aminobutyrate, and 304 mL of dichloroethane, add them to a reactor and stir until the system is dissolved, add 15.2 g of sodium carbonate to the reactor, raise the temperature of the reactor to 75°C, keep the reaction for 8 hours, lower the temperature of the reactor to room temperature, add 200 mL of purified water to the reactor, wash three times, dry the organic phase over anhydrous magnesium sulfate for 40 minutes, transfer it to a reactor at a temperature of 70°C, and distill under reduced pressure until no liquid is produced to obtain modified menthol.

[0062] S3. Preparation of modified nano zinc oxide

[0063] Weigh: 20g of nano zinc oxide, 8g of KH-540 and 120mL of anhydrous ethanol, add them into a reactor and stir, raise the temperature of the reactor to 45°C, add 40mL of 0.5mol / L sodium hydroxide solution into the reactor, keep warm and react for 90min, lower the temperature of the reactor to room temperature, filter, wash the filter cake with purified water until it is neutral and then dry, transfer the filter cake to a drying oven at a temperature of 60°C, and dry it in a hollow chamber to constant weight to obtain modified nano zinc oxide.

[0064] S4. Preparation of modified polyester

[0065] The catalyst is obtained by mixing cobalt acetate and antimony trioxide in a weight ratio of 1:3;

[0066] Weigh: 100g of dihydroxyethyl terephthalate, 140g of terephthalic acid, 140g of ethylene glycol and 2g of catalyst, add them into a nitrogen-protected reactor and stir, raise the temperature of the reactor to 170°C, and keep the temperature for 6h, add 100g of sodium diethylene glycol isophthalate-5-sulfonate and 60g of modified menthol into the reactor, raise the temperature of the reactor to 240°C, keep the temperature and stir for 10min, evacuate the reactor to a vacuum pressure of 20Pa, raise the temperature of the reactor to 260°C, keep the temperature and stir for 3h, discharge the material while hot, cool it down for solidification, slice it, and dry it to obtain modified polyester.

[0067] S5. Preparation of modified polyester yarn

[0068] The antioxidant 1010, sodium stearate, castor oil and dibutyl phthalate were uniformly mixed in a weight ratio of 2:3:1:2 to obtain an auxiliary additive;

[0069] The modified polyester, polyethylene glycol 4000, modified nano zinc oxide and auxiliary additives are added into a twin-screw extruder in a weight ratio of 50:20:3:5, the temperatures of the 6 temperature sections of the twin-screw extruder from the feed end to the discharge end are 280° C., 285° C., 295° C., 295° C., 295° C. and 300° C., the screw speed of the twin-screw extruder is 39 r / min, and the fibers are melt-extruded into a spinning machine with a spinning temperature of 310° C. and a spinneret aperture of 0.15 mm through the twin-screw extruder. After melt spinning, the fibers are heat-stretched at a temperature of 180° C. at a stretching ratio of 3 times to obtain a modified polyester fiber precursor;

[0070] The modified polyester fiber precursor and purified water were added into the reactor at a ratio of 1 g:10 mL, the temperature of the reactor was raised to 70°C, and the reactor was kept warm and steamed for 60 minutes. The fiber was taken out of the reactor, washed with purified water for 3 times, and then dried, to obtain the modified polyester fiber;

[0071] The modified polyester fiber was used as the raw material for blending to prepare the modified polyester yarn with a linear density of 18Tex.

[0072] S6. Preparation of knitted fabrics

[0073] Modified hollow cotton yarn and modified polyester yarn are used as textile raw materials, and a circular knitting machine is used as textile equipment. The paths for feeding yarn into the loop forming system of the circular knitting machine are as follows: the modified hollow cotton yarn is fed into the odd-numbered paths, and the modified polyester yarn is fed into the other paths. The two yarns are interwoven through the circular knitting machine to prepare weft plain knitted fabrics.

[0074] Example 2

[0075] This embodiment provides a method for preparing a sweat-wicking and heat-retaining composite fiber blended knitted fabric, comprising the following steps:

[0076] S1. Preparation of modified hollow cotton yarn

[0077] Octyltrimethoxysilane, anhydrous ethanol and purified water were mixed uniformly in a dosage ratio of 1 g: 8 mL: 2 mL to obtain a hydrophobic modified liquid;

[0078] Pure cotton hollow yarn and 0.4 mol / L sodium hydroxide solution were added into the reactor at a ratio of 1 g:10 mL, and the mixture was completely immersed. The temperature of the reactor was raised to 80°C, and the mixture was immersed for 17 min. The yarn was removed from the reactor and drained.

[0079] The drained pure cotton hollow yarn and the hydrophobic modification liquid were added into the reactor at a ratio of 1 g:2 mL. The temperature of the reactor was raised to 65°C and kept warm for 35 minutes. The yarn was washed with purified water until neutral and then dried at room temperature to obtain modified hollow cotton yarn.

[0080] S2. Preparation of modified menthol

[0081] Weigh: 15.6 g of menthol, 156 mL of dichloromethane, and 18.4 g of cyanuric chloride, add them into a reactor and stir until the system is dissolved, add 7.8 g of triethylamine into the reactor, keep the reaction at room temperature for 11 h, add 100 mL of purified water into the reactor, wash three times, dry the organic phase over anhydrous magnesium sulfate for 40 min, transfer it to a reactor at 60° C., and evaporate the solvent under reduced pressure to obtain intermediate I;

[0082] Weigh: 30.4 g of intermediate I, 35.1 g of methyl 4-aminobutyrate, and 304 mL of dichloroethane, add them to a reactor and stir until the system is dissolved, add 15.2 g of sodium carbonate to the reactor, raise the temperature of the reactor to 77° C., keep the reaction for 9 hours, lower the temperature of the reactor to room temperature, add 200 mL of purified water to the reactor, wash three times, dry the organic phase over anhydrous magnesium sulfate for 40 minutes, transfer it to a reactor at a temperature of 75° C., and distill under reduced pressure until no liquid is produced to obtain modified menthol.

[0083] S3. Preparation of modified nano zinc oxide

[0084] Weigh: 20g of nano zinc oxide, 8g of KH-540 and 120mL of anhydrous ethanol, add them into a reactor and stir, raise the temperature of the reactor to 50°C, add 40mL of 0.5mol / L sodium hydroxide solution into the reactor, keep warm for 105min, lower the temperature of the reactor to room temperature, filter, wash the filter cake with purified water until it is neutral and then dry, transfer the filter cake to a drying oven at a temperature of 65°C, and dry it in a hollow chamber to constant weight to obtain modified nano zinc oxide.

[0085] S4. Preparation of modified polyester

[0086] The catalyst is obtained by mixing cobalt acetate and antimony trioxide in a weight ratio of 1:3;

[0087] Weigh: 100g of dihydroxyethyl terephthalate, 140g of terephthalic acid, 140g of ethylene glycol and 2g of catalyst, add them into a nitrogen-protected reactor and stir, raise the temperature of the reactor to 175°C, and keep the temperature for 7h, add 100g of sodium diethylene glycol isophthalate-5-sulfonate and 60g of modified menthol into the reactor, raise the temperature of the reactor to 250°C, keep the temperature and stir for 13min, evacuate the reactor to a vacuum pressure of 40Pa, raise the temperature of the reactor to 270°C, keep the temperature and stir for 4h, discharge the material while hot, cool it down for solidification, slice it, and dry it to obtain modified polyester.

[0088] S5. Preparation of modified polyester yarn

[0089] The antioxidant 1010, calcium stearate, castor oil and dibutyl phthalate were uniformly mixed in a weight ratio of 2:3:1:2 to obtain an auxiliary additive;

[0090] The modified polyester, polyethylene glycol 4000, modified nano zinc oxide and auxiliary additives are added into a twin-screw extruder in a weight ratio of 50:20:3:5, the temperatures of the six temperature sections of the twin-screw extruder from the feed end to the discharge end are 280° C., 285° C., 295° C., 295° C., 295° C. and 300° C., the screw speed of the twin-screw extruder is 39 r / min, and the fibers are melt-extruded into a spinning machine with a spinning temperature of 313° C. and a spinneret aperture of 0.22 mm through the twin-screw extruder. After melt spinning, the fibers are heat-stretched at a temperature of 190° C. at a stretching ratio of 3 times to obtain a modified polyester fiber precursor;

[0091] The modified polyester fiber precursor and purified water were added into the reactor at a ratio of 1 g:10 mL, the temperature of the reactor was raised to 75°C, and the reactor was kept warm and steamed for 70 minutes. The fiber was taken out of the reactor, washed with purified water for 3 times, and then dried to obtain the modified polyester fiber.

[0092] The modified polyester fiber was used as the raw material for blending to prepare the modified polyester yarn with a linear density of 18.5Tex.

[0093] S6. Preparation of knitted fabrics

[0094] Modified hollow cotton yarn and modified polyester yarn are used as textile raw materials, and a circular knitting machine is used as textile equipment. The paths for feeding yarn into the loop forming system of the circular knitting machine are as follows: the modified hollow cotton yarn is fed into the odd-numbered paths, and the modified polyester yarn is fed into the other paths. The two yarns are interwoven through the circular knitting machine to prepare weft plain knitted fabrics.

[0095] Example 3

[0096] This embodiment provides a method for preparing a sweat-wicking and heat-retaining composite fiber blended knitted fabric, comprising the following steps:

[0097] S1. Preparation of modified hollow cotton yarn

[0098] Octyltrimethoxysilane, anhydrous ethanol and purified water were mixed uniformly in a dosage ratio of 1 g: 8 mL: 2 mL to obtain a hydrophobic modified liquid;

[0099] Pure cotton hollow yarn and 0.5 mol / L sodium hydroxide solution were added into the reactor at a ratio of 1 g:10 mL, and the mixture was completely immersed. The temperature of the reactor was raised to 85°C, and the mixture was immersed for 20 min. The yarn was removed from the reactor and drained.

[0100] The drained pure cotton hollow yarn and the hydrophobic modification liquid were added into the reactor at a ratio of 1 g:2 mL. The temperature of the reactor was raised to 70°C and kept warm for 40 minutes. The yarn was washed with purified water until neutral and then dried at room temperature to obtain modified hollow cotton yarn.

[0101] S2. Preparation of modified menthol

[0102] Weigh: 15.6 g of menthol, 156 mL of dichloromethane, and 18.4 g of cyanuric chloride, add them into a reactor and stir until the system is dissolved, add 7.8 g of triethylamine into the reactor, keep the reaction at room temperature for 12 h, add 100 mL of purified water into the reactor, wash three times, dry the organic phase over anhydrous magnesium sulfate for 40 min, transfer it to a reactor at 60° C., and evaporate the solvent under reduced pressure to obtain intermediate I;

[0103] Weigh: 30.4 g of intermediate I, 35.1 g of methyl 4-aminobutyrate, and 304 mL of dichloroethane, add them to a reactor and stir until the system is dissolved, add 15.2 g of sodium carbonate to the reactor, raise the temperature of the reactor to 80° C., keep the reaction for 10 hours, lower the temperature of the reactor to room temperature, add 200 mL of purified water to the reactor, wash three times, dry the organic phase over anhydrous magnesium sulfate for 40 minutes, transfer it to a reactor at 80° C., and distill under reduced pressure until no liquid is produced to obtain modified menthol.

[0104] S3. Preparation of modified nano zinc oxide

[0105] Weigh: 20g of nano zinc oxide, 8g of KH-540 and 120mL of anhydrous ethanol, add into the reactor and stir, raise the temperature of the reactor to 55°C, add 40mL of 0.5mol / L sodium hydroxide solution into the reactor, keep warm for 120min, lower the temperature of the reactor to room temperature, filter, wash the filter cake with purified water until it is neutral and then dry, transfer the filter cake to a drying oven at a temperature of 70°C, and dry it in hollow until constant weight to obtain modified nano zinc oxide.

[0106] S4. Preparation of modified polyester

[0107] The catalyst is obtained by mixing cobalt acetate and antimony trioxide in a weight ratio of 1:3;

[0108] Weigh: 100g of dihydroxyethyl terephthalate, 140g of terephthalic acid, 140g of ethylene glycol and 2g of catalyst, add them into a nitrogen-protected reactor and stir, raise the temperature of the reactor to 180°C, and keep the temperature for reaction for 8h, add 100g of sodium diethylene glycol isophthalate-5-sulfonate and 60g of modified menthol into the reactor, raise the temperature of the reactor to 260°C, keep the temperature and stir for 10-15min, evacuate the reactor to a vacuum pressure of 60Pa, raise the temperature of the reactor to 280°C, keep the temperature and stir for 5h, discharge the material while hot, cool it down for solidification, slice it, and dry it to obtain modified polyester.

[0109] S5. Preparation of modified polyester yarn

[0110] The antioxidant 1010, zinc stearate, castor oil and dimethyl phthalate are uniformly mixed in a weight ratio of 2:3:1:2 to obtain an auxiliary additive;

[0111] The modified polyester, polyethylene glycol 4000, modified nano zinc oxide and auxiliary additives are added into a twin-screw extruder in a weight ratio of 50:20:3:5, the temperatures of the six temperature sections of the twin-screw extruder from the feed end to the discharge end are 280° C., 285° C., 295° C., 295° C., 295° C. and 300° C., the screw speed of the twin-screw extruder is 39 r / min, and the fibers are melt-extruded into a spinning machine with a spinning temperature of 315° C. and a spinneret aperture of 0.3 mm through the twin-screw extruder. After melt spinning, the fibers are heat-stretched at a temperature of 200° C. at a stretching ratio of 3 times to obtain a modified polyester fiber precursor;

[0112] The modified polyester fiber precursor and purified water were added into the reactor at a ratio of 1 g:10 mL, the temperature of the reactor was raised to 80°C, and the fiber was kept warm and steamed for 80 minutes. The fiber was taken out of the reactor, washed with purified water for 3 times, and then dried to obtain the modified polyester fiber.

[0113] The modified polyester fiber was used as the raw material for blending to prepare the modified polyester yarn with a linear density of 19Tex.

[0114] S6. Preparation of knitted fabrics

[0115] Modified hollow cotton yarn and modified polyester yarn are used as textile raw materials, and a circular knitting machine is used as textile equipment. The paths for feeding yarn into the loop forming system of the circular knitting machine are as follows: the modified hollow cotton yarn is fed into the odd-numbered paths, and the modified polyester yarn is fed into the other paths. The two yarns are interwoven through the circular knitting machine to prepare weft plain knitted fabrics.

[0116] Comparative Example 1

[0117] The difference between this comparative example and Example 3 is that step S1 is eliminated, and the modified hollow cotton yarn in step S6 is replaced by the pure cotton hollow yarn in step S1.

[0118] Comparative Example 2

[0119] The difference between this comparative example and Example 3 is that in step S4, no modified menthol is added.

[0120] Comparative Example 3

[0121] The difference between this comparative example and Example 3 is that in step S5, polyethylene glycol 4000 is not added.

[0122] Performance Test:

[0123] The water absorption rate, drip diffusion time, wicking height and drying rate of the knitted fabric samples prepared in Examples 1-3 and 1-3 were tested with reference to the standard GB / T 21655.1-2023 “Evaluation of moisture absorption and quick-drying properties of textiles Part 1: Single combination test method”;

[0124] Referring to the standard GB / T 20944.2-2007 "Evaluation of antibacterial properties of textiles Part 2: Absorption method", the antibacterial rates of Example 1-3 and the knitted fabric samples prepared in Example 1-3 on Escherichia coli, Staphylococcus aureus and Klebsiella pneumoniae are tested. The specific test results are shown in Table 1 below.

[0125] Table 1-Performance test table of samples

[0126]

[0127]

[0128] Data Analysis:

[0129] Comparative analysis of the data in the above table shows that the water absorption rate of the knitted fabric prepared by the present invention reaches 279%, the drip diffusion time reaches 1.05s, the wicking height reaches 129mm, and the drying rate reaches 0.69g / h.

[0130] The antibacterial rate of Escherichia coli reaches 99.81%, the antibacterial rate of Staphylococcus aureus reaches 99.85%, and the antibacterial rate of Klebsiella pneumoniae reaches 99.72%. The performance parameters of each embodiment are better than those of the comparative example as a whole, indicating that the present invention performs hydrophobic modification on the hollow cotton yarn to prepare the modified hollow cotton yarn, and then uses the modified polyester containing sodium diethylene glycol isophthalate-5-sulfonate and modified menthol blocks, polyethylene glycol 4000 and modified zinc oxide to prepare the modified polyester fiber. By using the hydrophobically modified hollow cotton yarn and the prepared modified polyester fiber as raw materials, not only the hygroscopicity and quick-drying properties of the knitted fabric are effectively improved, so that the knitted fabric exhibits good perspiration and warmth-keeping properties, but also the antibacterial properties of the knitted fabric are effectively improved.

[0131] The above contents are merely examples and explanations of the structure of the present invention. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the structure of the invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

[0132] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0133] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A method for preparing a sweat-wicking and heat-retaining composite fiber blended knitted fabric, characterized in that: The following steps are involved: S1. Using pure cotton hollow yarn as raw material, hydrophobically modifying it to prepare modified hollow cotton yarn; S2, using modified polyester fiber as raw material for blending to prepare modified polyester yarn with a linear density of 18-19Tex; S3. Using modified hollow cotton yarn and modified polyester yarn as textile raw materials, the two yarns are interwoven through a circular knitting machine to prepare weft knitted fabrics.

2. The method for preparing a sweat-wicking and heat-retaining composite fiber blended knitted fabric according to claim 1, characterized in that: In step S1, the preparation method of the modified hollow cotton yarn is: completely immerse the pure cotton hollow yarn in a sodium hydroxide solution at a temperature of 75-85°C, keep it warm for 15-20 minutes, remove it from the sodium hydroxide solution and transfer it to a hydrophobic modification liquid, increase the temperature of the hydrophobic modification liquid to 60-70°C, keep it warm for 30-40 minutes, and post-treat to obtain the modified hollow cotton yarn.

3. The method for preparing a sweat-wicking and heat-retaining composite fiber blended knitted fabric according to claim 2, characterized in that: The dosage ratio of the pure cotton hollow yarn, the sodium hydroxide solution and the hydrophobic modification liquid is 1g:10mL:5mL, the concentration of the sodium hydroxide solution is 0.3-0.5mol / L, and the hydrophobic modification liquid is composed of octyltrimethoxysilane, anhydrous ethanol and purified water in a dosage ratio of 1g:8mL:2mL.

4. The method for preparing a sweat-wicking and heat-retaining composite fiber blended knitted fabric according to claim 1, characterized in that: In step S2, the modified polyester fiber is processed by the following steps: A1, adding bis(hydroxyethyl) terephthalate, terephthalic acid, ethylene glycol and a catalyst into a nitrogen-protected reactor and stirring, raising the temperature of the reactor to 170-180° C., and keeping the temperature for reaction for 6-8 hours, adding sodium diethylene glycol isophthalate-5-sulfonate and modified menthol into the reactor, raising the temperature of the reactor to 240-260° C., keeping the temperature for stirring for 10-15 minutes, evacuating the reactor to a vacuum pressure of 20-60 Pa, raising the temperature of the reactor to 260-280° C., keeping the temperature for stirring for 3-5 hours, discharging while hot, cooling and solidifying, slicing, and drying to obtain a modified polyester; A2, adding modified polyester, polyethylene glycol 4000, modified nano zinc oxide and auxiliary additives into a twin-screw extruder, melt-extruded into a spinning machine through the twin-screw extruder, and heat-stretched after melt spinning to obtain a modified polyester fiber precursor; A3. Add the modified polyester fiber precursor and purified water into a reactor, raise the temperature of the reactor to 70-80°C, and steam for 60-80 minutes. Take out the fiber from the reactor, wash it 3 times with purified water, drain it, and air-dry it to obtain the modified polyester fiber.

5. The method for preparing a sweat-wicking and heat-retaining composite fiber blended knitted fabric according to claim 4, characterized in that: In step A1, the weight ratio of dihydroxyethyl terephthalate, terephthalic acid, ethylene glycol, catalyst, sodium diethylene glycol 5-sulfonate and modified menthol is 5:7:7:0.1:5:3, and the catalyst is composed of cobalt acetate and antimony trioxide in a weight ratio of 1:3; in step A2, the weight ratio of the modified polyester, polyethylene glycol 4000, modified nano zinc oxide and auxiliary additives is 50:20:3:5; in step A3, the amount ratio of the modified polyester fiber precursor and purified water is 1g:10mL.

6. The method for preparing a sweat-wicking and heat-retaining composite fiber blended knitted fabric according to claim 4, characterized in that: Modified menthol is processed by the following steps: B1, adding menthol, dichloromethane and cyanuric chloride into a reaction kettle and stirring until the system is dissolved, adding triethylamine into the reaction kettle, keeping the reaction at room temperature for 10-12h, and post-treating to obtain intermediate I; B2. Add intermediate I, methyl 4-aminobutyrate and ethylene dichloride into a reactor and stir until the system is dissolved. Add sodium carbonate into the reactor, increase the temperature of the reactor to 75-80° C., keep the temperature for 8-10 hours, and perform post-treatment to obtain modified menthol.

7. The method for preparing a sweat-wicking and heat-retaining composite fiber blended knitted fabric according to claim 6, characterized in that: The preparation method of modified nano zinc oxide is as follows: nano zinc oxide, KH-540 and anhydrous ethanol are added into a reactor and stirred, the temperature of the reactor is raised to 45-55° C., alkali solution is added into the reactor, the reaction is kept warm for 90-120 minutes, and modified nano zinc oxide is obtained by post-treatment.

8. The method for preparing a sweat-wicking and heat-retaining composite fiber blended knitted fabric according to claim 7, characterized in that: The dosage ratio of the nano zinc oxide, KH-540, anhydrous ethanol and alkali solution is 5g:2g:30mL:10mL, and the alkali solution is 0.5mol / L sodium hydroxide solution.

9. The method for preparing a sweat-wicking and heat-retaining composite fiber blended knitted fabric according to claim 6, characterized in that: In step B1, the usage ratio of menthol and cyanuric chloride is 1 mol:1 mol, and the usage ratio of menthol, dichloromethane and triethylamine is 1 g:10 mL:0.5 g; in step B2, the usage ratio of intermediate I and methyl 4-aminobutyrate is 1 mol:3 mol, and the usage ratio of intermediate I, dichloroethane and sodium carbonate is 1 g:10 mL:0.5 g.

10. The method for preparing a sweat-wicking and heat-retaining composite fiber blended knitted fabric according to claim 9, characterized in that: In step S3, the paths for feeding the yarn into the loop forming system of the circular knitting machine are as follows: the odd-numbered paths are used to feed the modified hollow cotton yarn, and the other paths are used to feed the modified polyester yarn.

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