Moisture wicking yarn based on hemp fiber, preparation method and textile product

Abstract

The present invention relates to the field of textile technology, and in particular to a moisture-absorbing and perspiration-releasing yarn based on hemp fiber, a preparation method and a textile. The yarn is prepared by using hemp fiber as the main raw material. Since the hemp fiber molecules contain a large number of polar hydrophilic groups and the special structure they have, the moisture-absorbing and perspiration-releasing yarn based on hemp fiber has excellent moisture-absorbing and perspiration-releasing performance; spandex fiber has good elasticity, and the blending method of hemp fiber and spandex fiber can improve the elasticity of hemp fiber-based yarn and improve the wearing comfort of the fabric; spandex fiber is modified, and hydrophilic groups and graphene oxide are introduced into the spandex fiber molecules, which can improve the hydrophilicity, antistatic and antibacterial properties of the spandex fiber. The prepared yarn and the textile prepared by the yarn have excellent moisture-absorbing and perspiration-releasing properties, antistatic and antibacterial properties.

Description

Technical Field

[0001] The invention relates to the field of textile technology, and in particular to a moisture absorption and perspiration-releasing yarn based on hemp fiber, a preparation method and a textile. Background Art

[0002] Hemp fiber is a cellulose fiber with good hydrophilicity. In addition, it has a unique structure, and the yarn and fabric made from it have excellent moisture absorption and breathability. However, hemp fiber has poor elasticity, and the yarn made from it is not elastic after being spun into fabric, which affects the wearing comfort.

[0003] Chinese patent application CN108277570A discloses a functional gradient layer knitted fabric and its preparation method. The middle layer and the inner layer of the knitted fabric are woven from blended yarns. The blended yarns are blended yarns of hemp fiber, cotton fiber and polyester. However, hemp fiber has poor elasticity. The elasticity of the fabric is achieved through the knitting process. The elasticity of the yarn itself is poor. The elasticity of the fabric obtained by other textile processes (such as weaving) is not good. In addition, the moisture permeability and antibacterial properties of the yarn and fabric need to be improved. Chinese patent application CN101492855A discloses a hemp knitted fabric. The hemp knitted fabric is made of hemp blended yarn. The hemp blended yarn includes hemp and cotton. Although it has good hygroscopicity, the blended yarn agrees that there are problems that the elasticity and antibacterial properties need to be improved. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a moisture wicking yarn based on hemp fiber to solve the problem in the prior art that the elasticity, moisture permeability, antibacterial properties and other properties of hemp fiber-based blended yarn need to be improved.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0006] A method for preparing a moisture wicking yarn based on hemp fiber comprises the following steps:

[0007] Step 1, placing the spandex fiber in an oxidizing solution for soaking, and after the soaking is completed, draining, washing, and drying to obtain the surface-activated spandex fiber;

[0008] Step 2: adding hydroxyethyl methacrylate and olefin-modified graphene oxide into deionized water, and dispersing them by ultrasonication to obtain a modified solution;

[0009] The surface activated spandex fiber is placed in a glutaraldehyde aqueous solution for soaking, after the soaking is completed, the fiber is drained out, transferred to a modification solution for reaction, after the reaction is completed, the fiber is drained out, washed, and dried to obtain a modified spandex fiber;

[0010] Step 3: Blending the modified spandex fiber with the hemp fiber to obtain a moisture wicking yarn based on the hemp fiber.

[0011] Preferably, in step 1, the oxidizing solution is a mixed aqueous solution of nitric acid and sulfuric acid, in which the mass percentage of nitric acid is 0.7% and the mass percentage of sulfuric acid is 17%.

[0012] Preferably, in the step 1, the spandex fiber is subjected to a cleaning treatment, and the cleaning treatment comprises sequentially placing the fiber in acetone, anhydrous ethanol and deionized water for ultrasonic cleaning.

[0013] Preferably, in the step 2, when preparing the modified liquid, the mass ratio of hydroxyethyl methacrylate, olefin-modified graphene oxide and deionized water is (26-38):(5-10):100, and the ultrasonic dispersion condition is ultrasonic dispersion at a frequency of 30-50kHz for 30-60min.

[0014] Preferably, in step 2, during the immersion treatment, the mass ratio of the surface activated spandex fiber, the glutaraldehyde aqueous solution, and the modifying liquid is 1:(10-15):(15-20), the glutaraldehyde aqueous solution is a 5wt% glutaraldehyde aqueous solution, and the immersion conditions are immersion at room temperature for 20-30h.

[0015] Preferably, in step 2, the reaction is carried out under ultrasonic conditions and at a temperature of 35-45° C. for 1-2 hours.

[0016] Preferably, in step 2, the olefin-modified graphene oxide is prepared by the following steps:

[0017] Adding graphene oxide to ethanol, dispersing by ultrasonication, and adjusting the pH value to 3-4 to obtain a graphene oxide dispersion;

[0018] Adding γ-methacryloxypropyltrimethoxysilane to the ethanol aqueous solution and stirring to obtain a γ-methacryloxypropyltrimethoxysilane solution;

[0019] Adding γ-methacryloxypropyltrimethoxysilane to the graphene oxide dispersion to react, filtering, washing and drying after the reaction is completed to obtain olefin-modified graphene oxide.

[0020] Preferably, in the graphene oxide dispersion, the mass ratio of graphene oxide to ethanol is 1:(450-500); in the γ-methacryloxypropyltrimethoxysilane solution, the mass ratio of γ-methacryloxypropyltrimethoxysilane solution to ethanol aqueous solution is 3:(85-95); the mass ratio of γ-methacryloxypropyltrimethoxysilane solution to graphene oxide dispersion is (8.8-9.8):(45-50).

[0021] Furthermore, the ethanol aqueous solution is a 95wt% ethanol aqueous solution.

[0022] Preferably, the reaction is carried out at 55-65° C. for 20-30 h.

[0023] Preferably, in step three, the mass ratio of modified spandex fiber to hemp fiber is (3-8):(92-97).

[0024] Preferably, the mass ratio of the modified spandex fiber to the hemp fiber is 5:95.

[0025] Preferably, the blending process comprises: opening the modified spandex fiber and the hemp fiber separately, mixing them, and then processing them in sequence through the steps of mixing and opening, carding, drawing, roving and spun spinning.

[0026] Preferably, when the modified spandex fiber and the hemp fiber are opened separately and mixed and opened, the opening process adopts a rotation speed 5-10% lower than that of conventional cotton fiber opening.

[0027] Preferably, the process of the combing step is to use a hairy roller carding machine to comb the mixed fibers, and the rotation speed of the large cylinder of the hairy roller carding machine is 95-105r / min.

[0028] Preferably, the drawing process adopts a three-pass drawing process, each of which uses 8 feeds, the back zone drafting multiple of the first pass drawing is 1.7-2 times, and the back zone drafting multiples of the second and third passes drawing are the same, both 1.06-1.1 times.

[0029] Preferably, the process parameters of the roving process are: the roving Tex twist coefficient is 55-60, and the spindle speed is 440-480r / min.

[0030] Preferably, the process parameters of the spinning process are: the spinning Tex twist coefficient is 330-350, the sliver delivery speed is 10-15 m / min, and the spindle speed is 4500-9000 r / min.

[0031] The present invention also discloses a moisture wicking yarn based on hemp fiber prepared by adopting the preparation method of the moisture wicking yarn based on hemp fiber as mentioned above.

[0032] A textile product prepared using the above-mentioned moisture wicking yarn based on hemp fiber.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] In the present invention, hemp fiber is used as the main raw material to prepare the yarn. Since the hemp fiber molecules contain a large number of polar hydrophilic groups, and the fiber center has a large cavity, and there are many cracks and holes connected to it in the longitudinal direction, the fiber has more capillaries, which can quickly transfer and diffuse moisture and water vapor in the fabric, so that the moisture absorption and perspiration yarn based on hemp fiber and the textiles made of the yarn have excellent moisture absorption and perspiration performance;

[0035] Since spandex fiber has good elasticity, in the process of preparing moisture absorption and perspiration yarn, the hemp fiber and spandex fiber are blended to improve the elasticity of the hemp fiber-based yarn and improve the wearing comfort of the fabric; the spandex fiber is modified by firstly oxidizing and etching with a strong acid solution to improve the surface roughness of the spandex fiber, thereby improving the cohesion between the spandex fiber and the hemp fiber; the oxidation treatment with a strong acid solution can activate the surface of the spandex fiber, and then it can undergo a grafting reaction with the hydrophilic monomer hydroxyethyl methacrylate to introduce hydrophilic groups carboxyl and hydroxyl, thereby improving the hydrophilicity of the spandex fiber and improving the moisture absorption and perspiration performance of the composite yarn of spandex fiber and hemp fiber;

[0036] Hemp fiber has good antistatic and natural antibacterial properties. When spandex fiber is blended with hemp fiber, graphene oxide is modified by γ-methacryloxypropyltrimethoxysilane, and olefinic groups are introduced on the surface of graphene oxide. The olefinic modified graphene oxide is then grafted onto the surface-activated spandex fiber. This can improve the antistatic and antibacterial properties of the spandex fiber. The resulting spandex fiber and hemp fiber composite yarn has excellent antistatic and antibacterial properties. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 The present invention is a process flow chart of preparing the moisture absorption and perspiration yarn based on hemp fiber;

[0038] Figure 2 It is a bar graph showing the test results of the moisture permeability of the moisture absorption and perspiration yarn based on hemp fiber prepared in Examples 1-5 of the present invention and Comparative Examples 1-2;

[0039] Figure 3 A bar graph showing elasticity test results of the moisture absorption and perspiration yarn based on hemp fiber prepared in Examples 1-5 of the present invention and Comparative Examples 1-2;

[0040] Figure 4 It is a bar graph showing the antibacterial performance test results of the moisture absorption and perspiration yarn based on hemp fiber prepared in Examples 1-5 of the present invention and Comparative Examples 1-2;

[0041] Figure 5 It is a bar graph showing the antistatic performance test results of the moisture absorption and perspiration yarn based on hemp fiber prepared in Examples 1-5 of the present invention and Comparative Examples 1-2. DETAILED DESCRIPTION

[0042] Example 1

[0043] This embodiment discloses a method for preparing a moisture wicking yarn based on hemp fiber, comprising the following steps:

[0044] Step 1, placing the spandex fiber in acetone, anhydrous ethanol and deionized water in turn for ultrasonic cleaning, the amount of acetone, anhydrous ethanol and deionized water used is 15 times the mass of the spandex fiber, the frequency of ultrasonic cleaning is 50kHz, the time of ultrasonic cleaning is 15 minutes, after drying at room temperature, placing in an oxidizing solution, soaking at room temperature for 8 hours, after soaking is completed, draining, washing with deionized water until neutral, and drying at room temperature to obtain a surface-activated spandex fiber;

[0045] The oxidizing solution is a mixed aqueous solution of nitric acid and sulfuric acid, wherein the mass percentage of nitric acid is 0.7% and the mass percentage of sulfuric acid is 17%;

[0046] Step 2: Add hydroxyethyl methacrylate and alkenyl-modified graphene oxide to deionized water, wherein the mass ratio of hydroxyethyl methacrylate, alkenyl-modified graphene oxide and deionized water is 26:5:100, and perform ultrasonic dispersion at a frequency of 30 kHz for 60 minutes to obtain a modified solution;

[0047] Wherein, the olefin-modified graphene oxide is prepared by the following steps:

[0048] Graphene oxide was added to ethanol, the mass ratio of graphene oxide to ethanol was 1:450, and after ultrasonic dispersion at a frequency of 50 kHz for 30 minutes, a 1 mol / L hydrochloric acid aqueous solution was added dropwise to adjust the pH value to 3, thereby obtaining a graphene oxide dispersion;

[0049] Adding γ-methacryloxypropyltrimethoxysilane to a 95wt% ethanol aqueous solution, wherein the mass ratio of the γ-methacryloxypropyltrimethoxysilane solution to the 95wt% ethanol aqueous solution is 3:85, and stirring at a stirring speed of 300 r / min for 20 minutes to obtain a γ-methacryloxypropyltrimethoxysilane solution;

[0050] γ-methacryloxypropyltrimethoxysilane was added to the graphene oxide dispersion, the mass ratio of γ-methacryloxypropyltrimethoxysilane solution to the graphene oxide dispersion was 8.8:45, and the mixture was reacted at 55° C. for 30 h. After the reaction was completed, the mixture was filtered, washed with deionized water for 3 times, and dried in a vacuum drying oven at 50° C. for 10 h to obtain olefin-modified graphene oxide.

[0051] The surface activated spandex fiber was placed in a 5wt% glutaraldehyde aqueous solution and soaked at room temperature for 20 hours. After the soaking was completed, the fiber was drained out and transferred to a modification solution. The fiber was reacted for 2 hours under ultrasonic conditions at a frequency of 40kHz and a temperature of 35°C. After the reaction was completed, the fiber was drained out and washed with ethanol for 3 times and dried at room temperature to obtain a modified spandex fiber.

[0052] Step 3, blending the modified spandex fiber with the hemp fiber, wherein the mass ratio of the modified spandex fiber to the hemp fiber is 3:97, to obtain a moisture absorption and perspiration yarn based on the hemp fiber;

[0053] The blending process includes: opening the modified spandex fiber and the hemp fiber separately, mixing them, and then processing them through the steps of mixed opening, carding, drawing, roving and spinning in sequence;

[0054] Among them, the opening process adopts a rotation speed 5% lower than that of conventional cotton fiber opening; the process of the carding process is to use a wool-type roller carding machine to comb the mixed fiber, and the rotation speed of the large cylinder of the wool-type roller carding machine is 95r / min. The process of the drawing process is a three-pass drawing process, each of which uses 8 feeds, and the back zone drafting multiple of the first pass drawing is 1.7 times, and the back zone drafting multiples of the second and third passes drawing are the same, both 1.06 times. The process parameters of the roving process are: the roving Tex twist coefficient is 55, the spindle speed is 440r / min, and the process parameters of the spun yarn process are: the spun yarn Tex twist coefficient is 330, the spun yarn speed is 10m / min, and the spindle speed is 4500r / min.

[0055] Example 2

[0056] This embodiment discloses a method for preparing a moisture wicking yarn based on hemp fiber, comprising the following steps:

[0057] Step 1, placing the spandex fiber in acetone, anhydrous ethanol and deionized water in turn for ultrasonic cleaning, the amount of acetone, anhydrous ethanol and deionized water used is 15 times the mass of the spandex fiber, the frequency of ultrasonic cleaning is 50kHz, the time of ultrasonic cleaning is 15 minutes, after drying at room temperature, placing in an oxidizing solution, soaking at room temperature for 8 hours, after soaking is completed, draining, washing with deionized water until neutral, and drying at room temperature to obtain a surface-activated spandex fiber;

[0058] The oxidizing solution is a mixed aqueous solution of nitric acid and sulfuric acid, wherein the mass percentage of nitric acid is 0.7% and the mass percentage of sulfuric acid is 17%;

[0059] Step 2: Add hydroxyethyl methacrylate and alkenyl-modified graphene oxide to deionized water, wherein the mass ratio of hydroxyethyl methacrylate, alkenyl-modified graphene oxide and deionized water is 38:10:100, and perform ultrasonic dispersion at a frequency of 50 kHz for 30 minutes to obtain a modified solution;

[0060] Wherein, the olefin-modified graphene oxide is prepared by the following steps:

[0061] Graphene oxide was added to ethanol, the mass ratio of graphene oxide to ethanol was 1:500, and after ultrasonic dispersion at a frequency of 50 kHz for 30 minutes, 1 mol / L hydrochloric acid aqueous solution was added dropwise to adjust the pH value to 4 to obtain a graphene oxide dispersion;

[0062] Adding γ-methacryloxypropyltrimethoxysilane to a 95wt% ethanol aqueous solution, the mass ratio of the γ-methacryloxypropyltrimethoxysilane solution to the 95wt% ethanol aqueous solution is 3:95, and stirring at a stirring speed of 300 r / min for 20 minutes to obtain a γ-methacryloxypropyltrimethoxysilane solution;

[0063] γ-methacryloxypropyltrimethoxysilane was added to the graphene oxide dispersion, the mass ratio of γ-methacryloxypropyltrimethoxysilane solution to the graphene oxide dispersion was 9.8:50, and the mixture was reacted at 65° C. for 20 h. After the reaction was completed, the mixture was filtered, washed with deionized water for 3 times, and dried in a vacuum drying oven at 50° C. for 10 h to obtain olefin-modified graphene oxide.

[0064] The surface activated spandex fiber was placed in a 5wt% glutaraldehyde aqueous solution and soaked at room temperature for 30 hours. After the soaking was completed, the fiber was drained out and transferred to a modification solution. The fiber was reacted for 1 hour under ultrasonic conditions at a frequency of 40kHz and a temperature of 45°C. After the reaction was completed, the fiber was drained out and washed with ethanol for 3 times and dried at room temperature to obtain a modified spandex fiber.

[0065] Step 3, blending the modified spandex fiber with the hemp fiber, wherein the mass ratio of the modified spandex fiber to the hemp fiber is 8:92, to obtain a moisture absorption and perspiration yarn based on the hemp fiber;

[0066] The blending process includes: opening the modified spandex fiber and the hemp fiber separately, mixing them, and then processing them through the steps of mixed opening, carding, drawing, roving and spinning in sequence;

[0067] Among them, the opening process adopts a rotation speed 10% lower than that of conventional cotton fiber opening; the process of the carding process is to use a wool-type roller carding machine to comb the mixed fiber, and the rotation speed of the large cylinder of the wool-type roller carding machine is 105r / min. The process of the drawing process is a three-pass drawing process, each of which uses 8 feeds, the back zone drafting multiple of the first pass drawing is 2 times, and the back zone drafting multiples of the second and third passes drawing are the same, both 1.1 times. The process parameters of the roving process are: the roving Tex twist coefficient is 60, the spindle speed is 480r / min, and the process parameters of the spun yarn process are: the spun yarn Tex twist coefficient is 350, the spun yarn speed is 15m / min, and the spindle speed is 9000r / min.

[0068] Example 3

[0069] This embodiment discloses a method for preparing a moisture wicking yarn based on hemp fiber, comprising the following steps:

[0070] Step 1, placing the spandex fiber in acetone, anhydrous ethanol and deionized water in turn for ultrasonic cleaning, the amount of acetone, anhydrous ethanol and deionized water used is 15 times the mass of the spandex fiber, the frequency of ultrasonic cleaning is 50kHz, the time of ultrasonic cleaning is 15 minutes, after drying at room temperature, placing in an oxidizing solution, soaking at room temperature for 8 hours, after soaking is completed, draining, washing with deionized water until neutral, and drying at room temperature to obtain a surface-activated spandex fiber;

[0071] The oxidizing solution is a mixed aqueous solution of nitric acid and sulfuric acid, wherein the mass percentage of nitric acid is 0.7% and the mass percentage of sulfuric acid is 17%;

[0072] Step 2: Add hydroxyethyl methacrylate and alkenyl-modified graphene oxide to deionized water, wherein the mass ratio of hydroxyethyl methacrylate, alkenyl-modified graphene oxide and deionized water is 29:6:100, and perform ultrasonic dispersion at a frequency of 40 kHz for 45 minutes to obtain a modified solution;

[0073] Wherein, the olefin-modified graphene oxide is prepared by the following steps:

[0074] Graphene oxide was added to ethanol, the mass ratio of graphene oxide to ethanol was 1:460, and after ultrasonic dispersion at a frequency of 50 kHz for 30 minutes, 1 mol / L hydrochloric acid aqueous solution was added dropwise to adjust the pH value to 3.5 to obtain a graphene oxide dispersion;

[0075] γ-methacryloxypropyltrimethoxysilane was added to a 95 wt % ethanol aqueous solution, the mass ratio of the γ-methacryloxypropyltrimethoxysilane solution to the 95 wt % ethanol aqueous solution was 3:88, and the mixture was stirred at a stirring speed of 300 r / min for 20 min to obtain a γ-methacryloxypropyltrimethoxysilane solution;

[0076] γ-methacryloxypropyltrimethoxysilane was added to the graphene oxide dispersion, the mass ratio of γ-methacryloxypropyltrimethoxysilane solution to the graphene oxide dispersion was 9:46, and the mixture was reacted at 60° C. for 25 h. After the reaction was completed, the mixture was filtered, washed with deionized water for 3 times, and dried in a vacuum drying oven at 50° C. for 10 h to obtain olefin-modified graphene oxide.

[0077] The surface activated spandex fiber was placed in a 5wt% glutaraldehyde aqueous solution and soaked at room temperature for 24 hours. After the soaking was completed, the fiber was drained out and transferred to a modification solution. The fiber was reacted for 1.5 hours under ultrasonic conditions at a frequency of 40kHz and a temperature of 40°C. After the reaction was completed, the fiber was drained out and washed with ethanol for 3 times and dried at room temperature to obtain a modified spandex fiber.

[0078] Step 3, blending the modified spandex fiber with the hemp fiber, wherein the mass ratio of the modified spandex fiber to the hemp fiber is 5:95, to obtain a moisture wicking yarn based on the hemp fiber;

[0079] The blending process includes: opening the modified spandex fiber and the hemp fiber separately, mixing them, and then processing them through the steps of mixed opening, carding, drawing, roving and spinning in sequence;

[0080] Among them, the opening process adopts a rotation speed 8% lower than that of conventional cotton fiber opening; the process of the carding process is to use a wool-type roller carding machine to comb the mixed fibers, and the rotation speed of the large cylinder of the wool-type roller carding machine is 100r / min. The process of the drawing process is a three-pass drawing process, each of which uses 8 feeds, and the back zone drafting multiple of the first pass drawing is 1.85 times, and the back zone drafting multiples of the second and third passes drawing are the same, both of which are 1.08 times. The process parameters of the roving process are: the roving Tex twist coefficient is 58, and the spindle speed is 460r / min. The process parameters of the spun yarn process are: the spun yarn Tex twist coefficient is 340, the spun yarn speed is 13m / min, and the spindle speed is 7500r / min.

[0081] Example 4

[0082] This embodiment discloses a method for preparing a moisture wicking yarn based on hemp fiber, comprising the following steps:

[0083] Step 1, placing the spandex fiber in acetone, anhydrous ethanol and deionized water in turn for ultrasonic cleaning, the amount of acetone, anhydrous ethanol and deionized water used is 15 times the mass of the spandex fiber, the frequency of ultrasonic cleaning is 50kHz, the time of ultrasonic cleaning is 15 minutes, after drying at room temperature, placing in an oxidizing solution, soaking at room temperature for 8 hours, after soaking is completed, draining, washing with deionized water until neutral, and drying at room temperature to obtain a surface-activated spandex fiber;

[0084] The oxidizing solution is a mixed aqueous solution of nitric acid and sulfuric acid, wherein the mass percentage of nitric acid is 0.7% and the mass percentage of sulfuric acid is 17%;

[0085] Step 2: Add hydroxyethyl methacrylate and alkenyl-modified graphene oxide to deionized water, wherein the mass ratio of hydroxyethyl methacrylate, alkenyl-modified graphene oxide and deionized water is 32:7.5:100, and perform ultrasonic dispersion at a frequency of 40 kHz for 45 minutes to obtain a modified solution;

[0086] Wherein, the olefin-modified graphene oxide is prepared by the following steps:

[0087] Graphene oxide was added to ethanol, the mass ratio of graphene oxide to ethanol was 1:475, and after ultrasonic dispersion at a frequency of 50 kHz for 30 minutes, 1 mol / L hydrochloric acid aqueous solution was added dropwise to adjust the pH value to 3.5 to obtain a graphene oxide dispersion;

[0088] Adding γ-methacryloxypropyltrimethoxysilane to a 95wt% ethanol aqueous solution, the mass ratio of the γ-methacryloxypropyltrimethoxysilane solution to the 95wt% ethanol aqueous solution is 3:90, and stirring at a stirring speed of 300 r / min for 20 minutes to obtain a γ-methacryloxypropyltrimethoxysilane solution;

[0089] γ-methacryloxypropyltrimethoxysilane was added to the graphene oxide dispersion, the mass ratio of γ-methacryloxypropyltrimethoxysilane solution to the graphene oxide dispersion was 9.2:47.5, and the mixture was reacted at 60° C. for 25 h. After the reaction was completed, the mixture was filtered, washed with deionized water for 3 times, and dried in a vacuum drying oven at 50° C. for 10 h to obtain olefin-modified graphene oxide;

[0090] The surface activated spandex fiber was placed in a 5wt% glutaraldehyde aqueous solution and soaked at room temperature for 24 hours. After the soaking was completed, the fiber was drained out and transferred to a modification solution. The fiber was reacted for 1.5 hours under ultrasonic conditions at a frequency of 40kHz and a temperature of 40°C. After the reaction was completed, the fiber was drained out and washed with ethanol for 3 times and dried at room temperature to obtain a modified spandex fiber.

[0091] Step 3, blending the modified spandex fiber with the hemp fiber, wherein the mass ratio of the modified spandex fiber to the hemp fiber is 5:95, to obtain a moisture wicking yarn based on the hemp fiber;

[0092] The blending process includes: opening the modified spandex fiber and the hemp fiber separately, mixing them, and then processing them through the steps of mixed opening, carding, drawing, roving and spinning in sequence;

[0093] Among them, the opening process adopts a rotation speed 8% lower than that of conventional cotton fiber opening; the process of the carding process is to use a wool-type roller carding machine to comb the mixed fibers, and the rotation speed of the large cylinder of the wool-type roller carding machine is 100r / min. The process of the drawing process is a three-pass drawing process, each of which uses 8 feeds, and the back zone drafting multiple of the first pass drawing is 1.85 times, and the back zone drafting multiples of the second and third passes drawing are the same, both of which are 1.08 times. The process parameters of the roving process are: the roving Tex twist coefficient is 58, and the spindle speed is 460r / min. The process parameters of the spun yarn process are: the spun yarn Tex twist coefficient is 340, the spun yarn speed is 13m / min, and the spindle speed is 7500r / min.

[0094] Example 5

[0095] This embodiment discloses a method for preparing a moisture wicking yarn based on hemp fiber, comprising the following steps:

[0096] Step 1, placing the spandex fiber in acetone, anhydrous ethanol and deionized water in turn for ultrasonic cleaning, the amount of acetone, anhydrous ethanol and deionized water used is 15 times the mass of the spandex fiber, the frequency of ultrasonic cleaning is 50kHz, the time of ultrasonic cleaning is 15 minutes, after drying at room temperature, placing in an oxidizing solution, soaking at room temperature for 8 hours, after soaking is completed, draining, washing with deionized water until neutral, and drying at room temperature to obtain a surface-activated spandex fiber;

[0097] The oxidizing solution is a mixed aqueous solution of nitric acid and sulfuric acid, wherein the mass percentage of nitric acid is 0.7% and the mass percentage of sulfuric acid is 17%;

[0098] Step 2: Add hydroxyethyl methacrylate and alkenyl-modified graphene oxide to deionized water, wherein the mass ratio of hydroxyethyl methacrylate, alkenyl-modified graphene oxide and deionized water is 35:9:100, and perform ultrasonic dispersion at a frequency of 40 kHz for 45 minutes to obtain a modified solution;

[0099] Wherein, the olefin-modified graphene oxide is prepared by the following steps:

[0100] Graphene oxide was added to ethanol, the mass ratio of graphene oxide to ethanol was 1:490, and after ultrasonic dispersion at a frequency of 50 kHz for 30 minutes, 1 mol / L hydrochloric acid aqueous solution was added dropwise to adjust the pH value to 3.5 to obtain a graphene oxide dispersion;

[0101] Adding γ-methacryloxypropyltrimethoxysilane to a 95 wt % ethanol aqueous solution, wherein the mass ratio of the γ-methacryloxypropyltrimethoxysilane solution to the 95 wt % ethanol aqueous solution is 3:92, and stirring at a stirring speed of 300 r / min for 20 min to obtain a γ-methacryloxypropyltrimethoxysilane solution;

[0102] γ-methacryloxypropyltrimethoxysilane was added to the graphene oxide dispersion, the mass ratio of γ-methacryloxypropyltrimethoxysilane solution to the graphene oxide dispersion was 9.5:49, and the mixture was reacted at 60° C. for 25 h. After the reaction was completed, the mixture was filtered, washed with deionized water for 3 times, and dried in a vacuum drying oven at 50° C. for 10 h to obtain olefin-modified graphene oxide.

[0103] The surface activated spandex fiber was placed in a 5wt% glutaraldehyde aqueous solution and soaked at room temperature for 24 hours. After the soaking was completed, the fiber was drained out and transferred to a modification solution. The fiber was reacted for 1.5 hours under ultrasonic conditions at a frequency of 40kHz and a temperature of 40°C. After the reaction was completed, the fiber was drained out and washed with ethanol for 3 times and dried at room temperature to obtain a modified spandex fiber.

[0104] Step 3, blending the modified spandex fiber with the hemp fiber, wherein the mass ratio of the modified spandex fiber to the hemp fiber is 5:95, to obtain a moisture wicking yarn based on the hemp fiber;

[0105] The blending process includes: opening the modified spandex fiber and the hemp fiber separately, mixing them, and then processing them through the steps of mixed opening, carding, drawing, roving and spinning in sequence;

[0106] Among them, the opening process adopts a rotation speed 8% lower than that of conventional cotton fiber opening; the process of the carding process is to use a wool-type roller carding machine to comb the mixed fibers, and the rotation speed of the large cylinder of the wool-type roller carding machine is 100r / min. The process of the drawing process is a three-pass drawing process, each of which uses 8 feeds, and the back zone drafting multiple of the first pass drawing is 1.85 times, and the back zone drafting multiples of the second and third passes drawing are the same, both of which are 1.08 times. The process parameters of the roving process are: the roving Tex twist coefficient is 58, and the spindle speed is 460r / min. The process parameters of the spun yarn process are: the spun yarn Tex twist coefficient is 340, the spun yarn speed is 13m / min, and the spindle speed is 7500r / min.

[0107] Comparative Example 1

[0108] This comparative example discloses a method for preparing a moisture absorption and perspiration yarn based on hemp fiber, comprising the following steps:

[0109] Step 1, placing the spandex fiber in acetone, anhydrous ethanol and deionized water in turn for ultrasonic cleaning, the amount of acetone, anhydrous ethanol and deionized water used is 15 times the mass of the spandex fiber, the frequency of ultrasonic cleaning is 50kHz, the time of ultrasonic cleaning is 15 minutes, after drying at room temperature, placing in an oxidizing solution, soaking at room temperature for 8 hours, after soaking is completed, draining, washing with deionized water until neutral, and drying at room temperature to obtain a surface-activated spandex fiber;

[0110] The oxidizing solution is a mixed aqueous solution of nitric acid and sulfuric acid, wherein the mass percentage of nitric acid is 0.7% and the mass percentage of sulfuric acid is 17%;

[0111] Step 2: adding hydroxyethyl methacrylate to deionized water, wherein the mass ratio of hydroxyethyl methacrylate to deionized water is 38:110, and performing ultrasonic dispersion at a frequency of 50 kHz for 30 minutes to obtain a modified solution;

[0112] The surface activated spandex fiber was placed in a 5wt% glutaraldehyde aqueous solution and soaked at room temperature for 30 hours. After the soaking was completed, the fiber was drained out and transferred to a modification solution. The fiber was reacted for 1 hour under ultrasonic conditions at a frequency of 40kHz and a temperature of 45°C. After the reaction was completed, the fiber was drained out and washed with ethanol for 3 times and dried at room temperature to obtain a modified spandex fiber.

[0113] Step 3, blending the modified spandex fiber with the hemp fiber, wherein the mass ratio of the modified spandex fiber to the hemp fiber is 8:92, to obtain a moisture absorption and perspiration yarn based on the hemp fiber;

[0114] The blending process includes: opening the modified spandex fiber and the hemp fiber separately, mixing them, and then processing them through the steps of mixed opening, carding, drawing, roving and spinning in sequence;

[0115] Among them, the opening process adopts a rotation speed 10% lower than that of conventional cotton fiber opening; the process of the carding process is to use a wool-type roller carding machine to comb the mixed fiber, and the rotation speed of the large cylinder of the wool-type roller carding machine is 105r / min. The process of the drawing process is a three-pass drawing process, each of which uses 8 feeds, the back zone drafting multiple of the first pass drawing is 2 times, and the back zone drafting multiples of the second and third passes drawing are the same, both 1.1 times. The process parameters of the roving process are: the roving Tex twist coefficient is 60, the spindle speed is 480r / min, and the process parameters of the spun yarn process are: the spun yarn Tex twist coefficient is 350, the spun yarn speed is 15m / min, and the spindle speed is 9000r / min.

[0116] Comparative Example 2

[0117] This comparative example discloses a method for preparing a moisture absorption and perspiration yarn based on hemp fiber, comprising the following steps:

[0118] Step 1, placing the spandex fiber in acetone, anhydrous ethanol and deionized water in turn for ultrasonic cleaning, the amount of acetone, anhydrous ethanol and deionized water used is 15 times the mass of the spandex fiber, the frequency of ultrasonic cleaning is 50kHz, the time of ultrasonic cleaning is 15 minutes, after drying at room temperature, placing in an oxidizing solution, soaking at room temperature for 8 hours, after soaking is completed, draining, washing with deionized water until neutral, and drying at room temperature to obtain a surface-activated spandex fiber;

[0119] The oxidizing solution is a mixed aqueous solution of nitric acid and sulfuric acid, wherein the mass percentage of nitric acid is 0.7% and the mass percentage of sulfuric acid is 17%;

[0120] Step 2: adding the olefin-modified graphene oxide to deionized water, wherein the mass ratio of the olefin-modified graphene oxide to the deionized water is 10:138, and ultrasonically dispersing the mixture at a frequency of 50 kHz for 30 minutes to obtain a modified solution;

[0121] Wherein, the olefin-modified graphene oxide is prepared by the following steps:

[0122] Graphene oxide was added to ethanol, the mass ratio of graphene oxide to ethanol was 1:500, and after ultrasonic dispersion at a frequency of 50 kHz for 30 minutes, 1 mol / L hydrochloric acid aqueous solution was added dropwise to adjust the pH value to 4 to obtain a graphene oxide dispersion;

[0123] Adding γ-methacryloxypropyltrimethoxysilane to a 95wt% ethanol aqueous solution, the mass ratio of the γ-methacryloxypropyltrimethoxysilane solution to the 95wt% ethanol aqueous solution is 3:95, and stirring at a stirring speed of 300 r / min for 20 minutes to obtain a γ-methacryloxypropyltrimethoxysilane solution;

[0124] γ-methacryloxypropyltrimethoxysilane was added to the graphene oxide dispersion, the mass ratio of γ-methacryloxypropyltrimethoxysilane solution to the graphene oxide dispersion was 9.8:50, and the mixture was reacted at 65° C. for 20 h. After the reaction was completed, the mixture was filtered, washed with deionized water for 3 times, and dried in a vacuum drying oven at 50° C. for 10 h to obtain olefin-modified graphene oxide.

[0125] The surface activated spandex fiber was placed in a 5wt% glutaraldehyde aqueous solution and soaked at room temperature for 30 hours. After the soaking was completed, the fiber was drained out and transferred to a modification solution. The fiber was reacted for 1 hour under ultrasonic conditions at a frequency of 40kHz and a temperature of 45°C. After the reaction was completed, the fiber was drained out and washed with ethanol for 3 times and dried at room temperature to obtain a modified spandex fiber.

[0126] Step 3, blending the modified spandex fiber with the hemp fiber, wherein the mass ratio of the modified spandex fiber to the hemp fiber is 8:92, to obtain a moisture absorption and perspiration yarn based on the hemp fiber;

[0127] The blending process includes: opening the modified spandex fiber and the hemp fiber separately, mixing them, and then processing them through the steps of mixed opening, carding, drawing, roving and spinning in sequence;

[0128] Among them, the opening process adopts a rotation speed 10% lower than that of conventional cotton fiber opening; the process of the carding process is to use a wool-type roller carding machine to comb the mixed fiber, and the rotation speed of the large cylinder of the wool-type roller carding machine is 105r / min. The process of the drawing process is a three-pass drawing process, each of which uses 8 feeds, the back zone drafting multiple of the first pass drawing is 2 times, and the back zone drafting multiples of the second and third passes drawing are the same, both 1.1 times. The process parameters of the roving process are: the roving Tex twist coefficient is 60, the spindle speed is 480r / min, and the process parameters of the spun yarn process are: the spun yarn Tex twist coefficient is 350, the spun yarn speed is 15m / min, and the spindle speed is 9000r / min.

[0129] In the above embodiments and comparative examples, the spandex fiber is chopped spandex yarn with a length of 38 mm. The spandex yarn was purchased from Zhuji Datang Xiaoke Chemical Fiber Factory with a specification of 30D. The graphene oxide is a multilayer graphene oxide purchased from Zhejiang Zhiti Nano Micro New Materials Co., Ltd. with a model of DN-20DY, an average thickness of 1-3 nm, an average diameter of 4-7 μm, and a number of layers of 2-5. The hemp fiber was purchased from Jingde County Jinwei Hemp Industry Co., Ltd. with a fiber strength of ≥235 and a fiber length of ≥130 mm. The fiber was chopped to an average length of 38 mm before use.

[0130] Test example

[0131] The performance tests were performed on the moisture absorption and perspiration yarns based on hemp fibers prepared in the above examples and comparative examples:

[0132] (1) Moisture permeability test: The moisture wicking yarns based on hemp fibers prepared in Examples 1-5 and Comparative Examples 1-2 were knitted and woven according to conventional processes to obtain textile samples. The weight of each textile sample was 150 g / m 2, refer to the standard GB / T12704.1-2009 "Textile fabric moisture permeability test method Part 1: Moisture absorption method" to measure the moisture permeability of each textile sample, as shown in Table 1:

[0133] Table 1

[0134]

[0135] From Table 1 and Figure 2 It can be seen that the moisture absorption and perspiration yarn based on hemp fiber prepared by the present invention has good moisture permeability. Since hemp fiber molecules contain a large number of polar hydrophilic groups and have a special structure, the yarn based on hemp fiber has good moisture permeability; spandex fiber is modified to introduce hydrophilic groups, and the hydrophilicity is improved, and the yarn blended with hemp fiber has good moisture permeability, that is, good moisture absorption and perspiration. Compared with Example 2, in Comparative Example 1, the spandex fiber is not grafted with graphene oxide, and will not have a significant effect on the moisture permeability of the yarn; in Comparative Example 2, the spandex fiber is not grafted with hydroxyethyl methacrylate, lacks the hydrophilic effect of the hydrophilic group, and the spandex fiber has poor hydrophilicity. The moisture permeability of the yarn blended with spandex fiber and hemp fiber is reduced.

[0136] (2) Elasticity test: The elongation at break of the moisture wicking yarn based on hemp fiber prepared in Examples 1-5 and Comparative Examples 1-2 was measured with reference to the standard GB / T14344-2022 "Test method for tensile properties of chemical fiber filaments". The results are shown in Table 2:

[0137] Table 2

[0138]

[0139] From Table 2 and Figure 3 It can be seen that the moisture-absorbing and perspiration-wicking yarn based on hemp fiber prepared in the present invention has a certain elasticity. Spandex fiber has good elasticity. The blending of hemp fiber and spandex fiber can improve the elasticity of the yarn and improve the wearing comfort of the fabric. In Comparative Example 1 and Comparative Example 2, the usage ratio of modified spandex fiber to hemp fiber is the same as that in Example 2, and the elongation at break of the yarn does not change significantly.

[0140] Antibacterial performance test: The antibacterial effect of the moisture wicking yarn based on hemp fiber prepared in Examples 1-5 and Comparative Examples 1-2 after washing 50 times was measured with reference to the standard FZ / T73023-2006 "Antibacterial Knitwear". The results are shown in Table 3:

[0141] Table 3

[0142]

[0143] From Table 3 and Figure 4It can be seen that the moisture-absorbing and perspiration-wicking yarn based on hemp fiber prepared by the present invention has good antibacterial properties. Hemp fiber itself has good natural antibacterial properties. Spandex fiber is modified to introduce graphene oxide with antibacterial effect. The yarn prepared by blending spandex fiber and hemp fiber has good inhibitory effects on Staphylococcus aureus, Escherichia coli, and Candida albicans. Compared with Example 2, in Comparative Example 1, the spandex fiber is not grafted with graphene oxide, and the antibacterial effect of the yarn only depends on the hemp fiber. As the number of washings increases, the antibacterial effect is significantly reduced; in Comparative Example 2, the spandex fiber is not grafted with hydroxyethyl methacrylate, which mainly affects the hydrophilicity of the yarn and has no significant effect on the antibacterial properties of the yarn.

[0144] (4) Antistatic performance test: The charge surface density of each textile sample woven with the moisture wicking yarn based on hemp fiber prepared in Examples 1-5 and Comparative Examples 1-2 in Test Example (1) was measured with reference to the standard GB / T12703.2-2009 "Evaluation of electrostatic properties of textiles Part 2: Charge surface density". The measurement results are shown in Table 4:

[0145] Table 4

[0146]

[0147] From Table 4 and Figure 5 It can be seen that the moisture absorption and perspiration yarn based on hemp fiber prepared by the present invention has good antistatic properties. Hemp fiber itself has good natural antistatic properties. Spandex fiber is modified to introduce graphene oxide with antistatic effect. The yarn prepared by blending spandex fiber and hemp fiber has good antistatic properties. Compared with Example 2, in Comparative Example 1, the spandex fiber is not grafted with graphene oxide, the charge surface density increases, and the antistatic properties of the yarn decrease; in Comparative Example 2, the spandex fiber is not grafted with hydroxyethyl methacrylate, the hydrophilicity of the spandex fiber decreases, and the antistatic properties are also reduced.

[0148] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for preparing a moisture wicking yarn based on hemp fiber, characterized in that: The steps include: Step 1, placing the spandex fiber in an oxidizing solution for soaking treatment, washing and drying after the soaking is completed, to obtain the surface activated spandex fiber; The oxidizing solution is a mixed aqueous solution of nitric acid and sulfuric acid, wherein the mass percentage of nitric acid is 0.7% and the mass percentage of sulfuric acid is 17%; Step 2: adding hydroxyethyl methacrylate and olefin-modified graphene oxide into deionized water, and dispersing by ultrasonication to obtain a modified solution; The mass ratio of hydroxyethyl methacrylate, olefin-modified graphene oxide and deionized water is (26-38):(5-10):100, and the ultrasonic dispersion is carried out at a frequency of 30-50 kHz for 30-60 min. The surface activated spandex fiber is placed in a glutaraldehyde aqueous solution for soaking, after the soaking is completed, the fiber is drained out, transferred to a modification solution for reaction, after the reaction is completed, the fiber is drained out, washed, and dried to obtain a modified spandex fiber; The mass ratio of the surface activated spandex fiber, the glutaraldehyde aqueous solution and the modifying liquid is 1:(10-15):(15-20), and the glutaraldehyde aqueous solution is a 5wt% glutaraldehyde aqueous solution; The reaction conditions are: maintaining the temperature at 35-45°C for 1-2h under ultrasonic conditions; Step 3: Blending the modified spandex fiber with the hemp fiber to obtain a moisture wicking yarn based on the hemp fiber.

2. The method for preparing a moisture wicking yarn based on hemp fiber according to claim 1, characterized in that: In the step 2, the olefin-modified graphene oxide is prepared by the following steps: Adding graphene oxide to ethanol, dispersing by ultrasonication, and adjusting the pH value to 3-4 to obtain a graphene oxide dispersion; Adding γ-methacryloxypropyltrimethoxysilane to the ethanol aqueous solution and stirring to obtain a γ-methacryloxypropyltrimethoxysilane solution; Adding γ-methacryloxypropyltrimethoxysilane to the graphene oxide dispersion to react, filtering, washing and drying after the reaction is completed to obtain olefin-modified graphene oxide.

3. The method for preparing a moisture wicking yarn based on hemp fiber according to claim 2, characterized in that: In the graphene oxide dispersion, the mass ratio of graphene oxide to ethanol is 1:(450-500); in the γ-methacryloxypropyltrimethoxysilane solution, the mass ratio of γ-methacryloxypropyltrimethoxysilane solution to ethanol aqueous solution is 3:(85-95); the mass ratio of γ-methacryloxypropyltrimethoxysilane solution to graphene oxide dispersion is (8.8-9.8):(45-50); The reaction conditions are 55-65° C. for 20-30 h.

4. The method for preparing a moisture wicking yarn based on hemp fiber according to claim 1, characterized in that: In the step three, the mass ratio of the modified spandex fiber to the hemp fiber is (3-8):(92-97).

5. A moisture wicking yarn based on hemp fiber prepared by the method for preparing a moisture wicking yarn based on hemp fiber according to any one of claims 1 to 4.

6. A textile product made from the moisture wicking yarn based on hemp fiber as claimed in claim 5.

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