A preparation method of a flexible antibacterial yarn

Abstract

The present invention discloses a method for preparing a flexible antibacterial yarn. In the technical solution, bleached soybean protein fiber and lyocell fiber are used for treatment to obtain a mixture fiber with internal voids, and the mixture fiber is treated with an antibacterial sol. Then, the stabilized mixture fiber is mixed with polyester fiber filaments and chitin fiber to form a first fiber pre-drawing sliver; at the same time, long-staple cotton and fine-staple cotton are processed through osmosis, solubilization, etc. to obtain a second fiber pre-drawing sliver; and skin-friendly fiber is used as a third fiber pre-drawing sliver. Then, the first fiber pre-drawing sliver, the second fiber pre-drawing sliver, and the third fiber pre-drawing sliver are processed on a carding machine in a ratio of 1:1:1 to obtain a mixed carded sliver. After the mixed carded sliver is successively processed through drawing, roving, and spinning, automatic doffing treatment is carried out to obtain the finished yarn. The present invention has better hand feeling and skin-friendly property, and at the same time also has better continuous antibacterial performance.

Description

Technical Field

[0001] The present invention relates to the yarn preparation technology in the field of textile materials, and specifically relates to a method for preparing a flexible antibacterial yarn. Background Art

[0002] With the improvement of people's living standards, people's requirements for consumer goods are also getting higher and higher. Among them, for fabric products, the requirements have evolved from the initial pursuit of warmth to functional directions such as comfort, beauty, and beneficial to health, and functional textiles have emerged as the times require; various functional fabric products have been continuously developed. Among them, for antibacterial fabrics, in addition to requiring the moisture absorption and sweat discharge performance of ordinary fabrics, they also need to have better antibacterial properties.

[0003] The most common and effective method for obtaining antibacterial yarns in the prior art is to use antibacterial fibers as raw materials to blend and make yarns. The principle is to blend antibacterial fibers and ordinary fibers in a certain proportion, and the main ways to obtain the corresponding antibacterial fibers are natural antibacterial fibers, melt spinning method, wet spinning method, surface metallization finishing method, and antibacterial agent soaking method. Among them, the antibacterial effect of natural antibacterial fibers is generally average, and a large proportion needs to be used to obtain a better antibacterial effect; for the antibacterial fibers obtained by the melt spinning method and the wet spinning method, due to the limited antibacterial substances on the fiber surface, when forming yarns, a sufficient content is required, which results in the performance of the entire yarn and fabric being greatly affected by the antibacterial fibers. At the same time, due to the use of chemical reagents, it may damage the hand feeling and style of the fabric, and even cause secondary harm to the skin; while the surface metallization finishing method can achieve good antibacterial performance with less metal usage, but the metallized surface is easily oxidized, and the antibacterial performance decreases rapidly with the increase of use time and cannot maintain persistent antibacterial properties; the antibacterial agent soaking method is usually not wash-resistant, and most of the antibacterial agents will be lost during the washing process, resulting in a rapid decline in antibacterial effect, which is far from the requirement of persistent antibacterial performance with better antibacterial effect under multiple washing conditions.

[0004] For the above reasons, a method for preparing an antibacterial yarn (application number: 201910972027.X) provides a method for preparing an antibacterial yarn by using bleached soy protein fiber for gap filling modification treatment with a silver glycine chelate nitrate solution and nano-titanium dioxide sol. However, although the antibacterial yarn prepared by this method has a good antibacterial effect, its overall elasticity is poor, it is easy to absorb water and deform, and after being made into fabric, the fabric has poor fabric performance, is easy to wrinkle and deform, has a large shrinkage rate, and poor dimensional stability. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a method for preparing a flexible antibacterial yarn to solve the defects in the above technical background.

[0006] The technical problem solved by the present invention is achieved by the following technical solutions:

[0007] A method for preparing a flexible antibacterial yarn, specifically including the following operating steps:

[0008] S1 Pretreat the bleached soy protein fiber. When treating, add the bleached soy protein fiber into warm water at 50 - 60 °C and soak it at a constant temperature for 1 - 2 h, then take it out and perform a rapid cooling treatment to obtain a modified bleached soy protein fiber with voids inside; use a swelling agent to perform fiber swelling treatment on the Lyocell fiber to obtain a swollen Lyocell fiber with a swelling degree of 35% - 45%;

[0009] S2 Immerse the modified bleached soy protein fiber and the swollen Lyocell fiber in a silver glycine nitrate chelate soaking solution for 6 - 8 h, then put them into a nano - titanium dioxide sol, perform ultrasonic dispersion treatment at a device power of 300 - 400 W for 20 - 30 min, then extrude the excess sol, rinse with running water for 10 - 20 s, and then dry with hot air;

[0010] S3 Perform pre - mixing treatment on 50 - 60 wt% of the modified bleached soy protein fiber treated in step S2, 20 - 35 wt% of the swollen Lyocell fiber treated in step S2, 7 - 20 wt% of polyester fiber filaments, and the remaining chitin fiber, and then perform carding, combing, and pre - drawing treatments in sequence to obtain a first fiber pre - drawn sliver;

[0011] S4 Pre - mix long - staple cotton and fine - staple cotton, and after mixing evenly, add them into hot water at 85 - 90 °C for soaking pretreatment for 10 - 15 min. After the soaking pretreatment is completed, take them out and dry naturally;

[0012] S5 Add the pre - mixed cotton after drying into a container, and also add warm water at 40 - 45 °C and keep it. According to the water consumption in the container, sequentially add penetrant FKS at 0.5 - 1 g / L, sodium hydroxide at 2 - 3 g / L, acetic acid at 10 - 30 ml / L of 1 mol / L, and carboxymethyl cellulose at 0.3 - 0.5 g / L. The above agents are added sequentially, and the addition interval is not less than 5 min. After adding carboxymethyl cellulose, raise the water temperature to 90 - 95 °C and keep it for 30 - 45 min to make the pre - mixed cotton be fully soaked. Then take out the pre - mixed cotton after soaking and dry it to obtain pre - mixed cotton fibers;

[0013] S6 Immerse the pre - mixed cotton fibers treated in step S5 in a silver glycine nitrate chelate soaking solution for 6 - 8 h, then put them into a nano - titanium dioxide sol, perform ultrasonic dispersion treatment at a device power of 300 - 400 W for 20 - 30 min, then extrude the excess sol, rinse with running water for 10 - 20 s, and then dry with hot air;

[0014] S7 mixes 75 - 85 wt% of the premixed cotton fibers processed in step S6 with the remaining viscose fibers, and then successively performs carding and pre-drawing processes to obtain a second fiber pre-drawn sliver;

[0015] S8 successively performs mixing, opening and cleaning cotton processes and carding process on the skin-friendly fibers to obtain a third fiber pre-drawn sliver;

[0016] S9 processes the first fiber pre-drawn sliver, the second fiber pre-drawn sliver, and the third fiber pre-drawn sliver in a ratio of 1:1:1 on a carding machine to obtain a mixed carded sliver. After successively performing drawing, roving, and spinning processes on the mixed carded sliver, automatic doffing is performed to obtain the finished flexible antibacterial yarn.

[0017] As a further limitation, in the step S1, the method of performing rapid cooling treatment is to soak in ice water for 120 - 150 min or to maintain at a temperature of -18 - -25 °C for 30 - 50 min.

[0018] As a further limitation, in the step S2, the preparation method of the silver glycine chelate soaking solution is as follows:

[0019] Weigh 10 parts by mass of glycine and 15 parts by mass of silver oxide as raw materials. Completely dissolve glycine in 300 - 500 parts by mass of deionized water, then add dilute nitric acid to adjust the pH value of the solution to below 4.2, and then slowly add silver oxide. Perform ultrasonic dispersion at a device power of 300 - 400 W, and then slowly adjust the pH value to neutral. Filter out the insoluble substances to obtain the silver glycine chelate soaking solution.

[0020] As a further limitation, in the step S2, the preparation method of the titanium dioxide sol is as follows:

[0021] Add 9 parts by mass of tetrabutyl titanate and 12 parts by mass of glacial acetic acid to 150 - 300 parts by mass of deionized water. After stirring evenly, add dilute nitric acid to adjust the pH value of the solution to below 5. Stir and react at a temperature of 40 - 50 °C for 30 - 40 min, and then naturally cool and age to obtain the titanium dioxide sol.

[0022] As a further limitation, when performing hot air drying treatment in the step S2 and the step S6, the hot air temperature is 45 - 50 °C and the wind speed is 5 - 6 m / s.

[0023] As a further limitation, the optimal addition ratio of long-staple cotton and fine-staple cotton in the step S4 is a mass ratio of 3:1 - 5:1.

[0024] As a further limitation, in step S8, the skin-friendly fiber is one of cotton fiber, hemp fiber, bamboo fiber, and wool fiber, or a mixture fiber of cotton fiber, hemp fiber, bamboo fiber, or wool fiber and modal, polyester fiber, spandex, and Lycra in any proportion.

[0025] Beneficial effects: The antibacterial yarn prepared by the method for preparing a flexible antibacterial yarn of the present invention has a soft surface and excellent soft hand feeling. After being made into a fabric, it has a stable setting effect, is not easy to wrinkle and deform, has a small deformation after washing, good dimensional stability, and can comprehensively utilize chelated silver ions and the fiber characteristics of itself for antibacterial, having a better antibacterial effect, and can effectively prevent the diffusion and spread of bacteria; at the same time, it has excellent washing resistance and can still maintain a better antibacterial effect after multiple washings. Detailed implementation manners

[0026] In order to make the technical means, creative features, achieved purposes, and functions of the present invention easy to understand, the present invention will be further described below with reference to specific embodiments.

[0027] In the following embodiments, those skilled in the art of the present technology can understand that unless otherwise defined, all terms (including technical terms and scientific terms) used here have the same meaning as the general understanding of those of ordinary skill in the art in the field to which this application belongs. It should also be understood that terms such as those defined in a general dictionary should be understood to have a meaning consistent with the meaning in the context of the prior art, and will not be interpreted with an idealized or overly formal meaning unless defined as here.

[0028] In this embodiment, the flexible antibacterial yarn is prepared according to the following steps:

[0029] During preparation, first, modified bleached soy protein fiber and swollen Lyocell fiber are prepared. First, the bleached soy protein fiber is soaked in warm water at 56°C for 2 hours under constant temperature, and then taken out for rapid cooling treatment. During the rapid cooling treatment, it can be soaked in ice water for 120 - 150 minutes or maintained at a temperature of -18 to -25°C for 30 - 50 minutes. In this embodiment, the rapid cooling treatment method is to maintain at a temperature of -22°C for 40 minutes, which has faster processing and higher efficiency. When soaking in ice water for treatment, the dimensional stability of the formed fiber is better.

[0030] The bleached soybean protein fiber is made from soybean protein as raw material through wet spinning. It has good physical and chemical properties. Its single fiber fineness is low, while its strength is higher than that of natural fibers such as wool, cotton, and silk. It has good spinnability and is suitable for developing high-count and high-density high-grade fabrics. Moreover, the outer layer of the soybean protein fiber is basically protein, containing various essential amino acids for the human body. Therefore, it has a high affinity for the human body and has certain health care functions. At the same time, as a plant protein fiber, the bleached soybean protein fiber itself has the characteristics of soybean protein. By soaking the bleached soybean protein fiber at a constant temperature, its surface can swell. At this time, rapid cooling can destroy the internal structure of the plant protein, resulting in changes in the internal tissue structure of the fiber, inducing the oil bodies to fuse with each other, destroying some of its protein bodies, and aggregating with the oil bodies, so that larger voids and channels appear in the internal system of the bleached soybean protein fiber. Therefore, the warm water soaking operation can make the bleached soybean protein fiber absorb water, swell and open, and then the subsequent rapid cooling operation produces a modified bleached soybean protein fiber with voids inside.

[0031] In this embodiment, the Lyocell fiber is swollen by using warm water plus 3% NaOH by mass fraction as a swelling agent to obtain a swollen Lyocell fiber with a swelling degree of 40%. The water retention value and specific surface area of the swollen Lyocell fiber both increase, and at the same time, the mechanical properties of the fiber are less affected, and it has better elasticity and structural stability.

[0032] The modified bleached soybean protein fiber and the Lyocell fiber are soaked with chelated silver, and the surface of the fiber is stabilized by titanium dioxide sol to prevent the precipitation of chelated silver, thereby consolidating the antibacterial properties of chelated silver ions. During the treatment, the modified bleached soybean protein fiber and the swollen Lyocell fiber are added to the nitric acid glycine chelated silver soaking solution and soaked for 7h, and then put into the nano-titanium dioxide sol. After being treated at an ultrasonic power of 350W for 25min, the excess sol is extruded, rinsed with running water for 15S, and after washing off the surface floating slurry, it is dried with hot air at 50°C.

[0033] Among them, to obtain better treatment effects, in this embodiment, the chelated silver solution for soaking is a silver glycine nitrate soaking solution. When preparing it, 10 parts by mass of glycine and 15 parts by mass of silver oxide are weighed as raw materials. The glycine is completely dissolved in 400 parts by mass of deionized water, and then the pH value of the solution is adjusted to 4.1 with dilute nitric acid. Then, silver oxide is slowly added, and ultrasonic dispersion is carried out at a device power of 350 W. Then, the pH value is slowly adjusted to neutral, and the insoluble substances are filtered off to obtain the silver glycine nitrate soaking solution for soaking treatment. When preparing the titanium dioxide sol, 9 parts by mass of tetrabutyl titanate and 12 parts by mass of glacial acetic acid are added to 220 parts by mass of deionized water. After stirring evenly, dilute nitric acid is added to adjust the pH value of the solution to below 4.8, and stirring reaction is carried out at a temperature of 45 °C for 40 min. Then, it is naturally cooled and aged for 12 h to obtain the titanium dioxide sol as the treatment raw material.

[0034] In this embodiment, although the rapidly cooled and damaged bleached soybean protein fiber can be used to absorb and fix chelated silver ions, the toughness of the fiber itself decreases, it is easy to become brittle and lose elasticity, and at the same time, the surface feel will also be affected. Other elastic fibers are needed to maintain the elasticity and stability; on the one hand, the swollen Lyocell fiber itself can be used in combination with chitin fiber to cooperate with the bleached soybean protein fiber to absorb a certain amount of chelated silver ions as an antibacterial function aid. At the same time, the swollen Lyocell fiber has better elasticity and structural stability. Cooperating with polyester fiber filaments can ensure the overall strength, toughness and structural stability of the fiber bundle of the mixture containing bleached soybean protein fiber; and under the ratio conditions of this embodiment, cooperating with the swollen Lyocell fiber, polyester fiber filaments and chitin fiber can also effectively make up for the defect of the skin-friendly feeling of the fiber.

[0035] To obtain the above effects, the mass ratio dosages of the modified bleached soybean protein fiber treated with chelated silver solution and nano-titanium dioxide sol, the swollen Lyocell fiber treated with chelated silver solution and nano-titanium dioxide sol, polyester fiber filaments, and chitin fiber are respectively: 50 - 60 wt%, 20 - 35 wt%, 7 - 20 wt% and 5 - 8 wt%. The total dosage of the four components is 100 wt%. In this embodiment, the modified bleached soybean protein fiber treated with chelated silver solution and nano-titanium dioxide sol is 55 wt%, the swollen Lyocell fiber treated with chelated silver solution and nano-titanium dioxide sol is 30 wt%, the polyester fiber filaments are 10 wt%, and the chitin fiber is 5 wt%. The raw materials meeting the above mass ratio are subjected to pre-mixing treatment, and then carding, combing and pre-drawing treatment are carried out in sequence to obtain the first fiber pre-drawing.

[0036] Then, the long-staple cotton and fine-staple cotton raw materials are premixed in a mass ratio of 3:1. After being mixed evenly, they are added to hot water at 90°C for soaking pretreatment for 10 minutes to expand and improve water absorption. After the soaking pretreatment is completed, they are taken out and dried naturally. After drying, the mixture of cotton fibers is added to warm water at 45°C and maintained. Taking the water consumption in the container as the reference amount, penetrant FKS is added, and the addition amount of penetrant FKS is 0.8 g / L. After 5 minutes, sodium hydroxide is added, and the addition amount of sodium hydroxide is 2.5 g / L. After 8 minutes, acetic acid is added. The acetic acid is an acetic acid aqueous solution with a concentration of 1 mol / L, and the addition amount is 20 ml / L. After 10 minutes, carboxymethyl cellulose is added, and the addition amount of carboxymethyl cellulose is 0.4 g / L. After adding carboxymethyl cellulose, the water temperature in the container is raised to 90°C and maintained for 40 minutes to ensure that the cotton yarn is fully soaked. Then, the soaked cotton yarn is taken out and dried. The above operation steps are mainly used to modify the cotton yarn, improve the penetration performance of the cotton yarn to facilitate the use of chelated silver soaking in subsequent operations, and stabilize the fiber surface through titanium dioxide sol to prevent the precipitation of chelated silver, thereby consolidating the persistence and stability of the antibacterial properties of chelated silver ions.

[0037] 80 wt% of the premixed cotton fibers treated by the above scheme are mixed with 20 wt% of viscose fibers, and after mixing, they are successively subjected to carding and pre-drawing processes to obtain a second fiber pre-drawing. Since the premixed cotton fibers have a relatively long-lasting antibacterial effect, but due to the treatment with titanium dioxide gel, their hygroscopicity and hand feel will decline, and viscose fibers are needed to make up for the performance. Viscose fibers are similar in nature to cotton and have a softer hand feel, better hygroscopicity and air permeability than cotton. After being mixed in proportion, the fiber texture of the fiber pre-drawing is close to that of cotton fiber pre-drawing. At the same time, the proportion of long-staple cotton and fine-staple cotton premixed cotton fibers can also maintain the anti-shrinkage performance of the second fiber pre-drawing and resist the defect of poor dimensional stability of viscose fibers themselves.

[0038] In this embodiment, 60 wt% of cotton fibers, 25 wt% of Lycra and 15 wt% of spandex are used as skin-friendly fibers, and after being successively mixed, through the opening and cleaning cotton process and the carding process, a third fiber pre-drawing is obtained. The first fiber pre-drawing, the second fiber pre-drawing, and the third fiber pre-drawing are processed on a carding machine in a ratio of 1:1:1 to obtain a mixed carded sliver. After the mixed carded sliver is successively subjected to drawing, roving, and spinning processes, automatic doffing is performed to obtain a finished flexible antibacterial yarn.

[0039] Under the preparation process conditions of the above embodiment, the prepared finished flexible antibacterial yarn has better elasticity, skin-friendly comfort, obvious antibacterial effect and good durability, and is especially suitable as the basic weaving raw material for intimate fabrics such as underwear and panties.

[0040] To characterize the above preparation process, the properties of the first fiber drawframe sliver were tested in Example Group 1: The raw materials, proportional relationships, and operating steps of the first fiber drawframe sliver were selectively missing, and then the first fiber drawframe sliver was drawn in two strands. After roving and spinning processes in sequence, the yarn was obtained by automatic doffing and its properties were tested. Each group of specimens was 10, and the average value was taken:

[0041] The fiber strength of the yarn was directly measured with a fiber tensile tester;

[0042] When testing the antibacterial property of the yarn, the yarn and cotton yarn were spun and woven under the same process conditions to obtain the corresponding fabric:

[0043] Antibacterial test: The antibacterial rate of the above antibacterial fabric was quantitatively tested according to GB / T20994.3-2008 "Evaluation of antibacterial properties of textiles - Part 3: Oscillation method"; The test included the test of the newly prepared fabric and the test twice after washing 20 times using the strong washing program mode of the washing machine;

[0044] The skin-friendly texture was the first feeling recorded by randomly selecting 50 people after touching the fabric, including skin-friendly comfort and softness, which were classified into excellent, qualified, general, and poor for grading evaluation, and the grading ratio with the largest value was taken as the result. The results are shown in the following table.

[0045]

[0046] Among them: The antibacterial treatment mentioned in the above table refers to soaking in a chelated silver solution and treatment with nano-titanium dioxide sol.

[0047] It can be seen from the above table content that during the preparation process of the first fiber drawframe sliver, the modification treatment of bleached soy protein fiber and the swelling treatment of Lyocell fiber can effectively improve the antibacterial treatment effect of the first fiber drawframe sliver and at the same time effectively improve the anti-washing effect of the antibacterial effect, ensuring its antibacterial effect during long-term washing. Although the substitution of cotton fiber can also obtain an antibacterial effect, the persistence and stability of this antibacterial effect are poor; The addition of the proportion of Lyocell fiber and polyester fiber filaments can effectively improve the strength and elasticity after fiber forming and appropriately improve the softness of the fiber, while the addition of chitin fiber can effectively improve the comfort of the first fiber drawframe sliver and also slightly enhance the antibacterial effect and the persistence of the antibacterial effect because chitin fiber itself contains antibacterial substances.

[0048] In the embodiments of the present invention, the addition of the second fiber pre-drawn sliver and the third fiber pre-drawn sliver is mainly to improve the skin-friendly property and comfort of the yarn itself while ensuring the antibacterial property of the yarn, and to obtain a texture close to that of natural fibers. In this embodiment, the prepared flexible antibacterial yarn, a commercially available civil antibacterial yarn of the same fineness, and a medical antibacterial yarn are subjected to performance tests. Each group of specimens has 10, and the average value is taken, and they are respectively used as Example 9, Comparative Example 1, and Comparative Example 2:

[0049] The fiber strength of the yarn is directly measured by a fiber tensile tester;

[0050] For the antibacterial property test of the yarn, the flexible antibacterial yarn, a commercially available civil antibacterial yarn of the same fineness, and a medical antibacterial yarn are used to spin and weave under the same process conditions to obtain the corresponding fabrics, which respectively correspond to Example 9, Comparative Example 1, and Comparative Example 2:

[0051] Antibacterial test: Quantitative antibacterial rate test is carried out on the above antibacterial fabrics according to GB / T20994.3-2008 "Evaluation of antibacterial properties of textiles - Part 3: Oscillation method"; The test includes the test of the newly prepared fabric and the test twice after washing 20 times using the strong washing program mode of the washing machine;

[0052] For the skin-friendly texture, 50 randomly selected people are used to record the first feelings after touching the fabric, including skin-friendly comfort and softness, which are divided into excellent, qualified, general, and poor for grading evaluation, and the grading ratio with the largest is taken as the result. The results are as follows:

[0053]

[0054]

[0055] Among them: The antibacterial treatment mentioned in the above table refers to soaking in a chelated silver solution and treating with a nano-titanium dioxide sol.

[0056] It can be seen from the content of the above table that Example 9 of the present application document is the finished flexible antibacterial yarn prepared based on the preparation steps in the embodiments of the present specific implementation manner. Compared with the civil antibacterial yarn in Comparative Example 1, its antibacterial effect and the wash resistance of the antibacterial effect are significantly better than those of Comparative Example 1, and the breaking strength and comfort are better; while compared with the medical antibacterial yarn in Comparative Example 2, although its antibacterial effect and the wash resistance of the antibacterial effect are slightly weaker, the breaking strength of the medical antibacterial yarn in Comparative Example 2 is poor, and it is easy to break during use, and at the same time, the comfort and softness are also poor.

[0057] The foregoing has shown and described the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments, and what is described in the above embodiments and the specification is only to illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements fall within the scope of the present invention claimed. The scope of the present invention claimed is defined by the appended claims and their equivalents.

Claims

1. A preparation method of flexible antibacterial yarns, characterized in that, it specifically includes the following operation steps: S1 Pretreat the bleached soy protein fiber. When treating, add the bleached soy protein fiber into warm water at 50-60°C and soak it at a constant temperature for 1-2h, then take it out and perform a rapid cooling treatment to obtain modified bleached soy protein fiber with voids inside; Use a swelling agent to perform fiber swelling treatment on the Lyocell fiber to obtain swollen Lyocell fiber with a swelling degree of 35%-45%; S2 Immerse the modified bleached soy protein fiber and the swollen Lyocell fiber in a silver glycine nitrate chelate soaking solution for 6-8h, then put them into nano-titanium dioxide sol, and perform ultrasonic dispersion treatment for 20-30min at a device power of 300-400W, then extrude the excess sol, rinse with running water for 10-20S and then dry with hot air; S3 Pre-mix 50-60wt% of the modified bleached soy protein fiber treated in step S2, 20-35wt% of the swollen Lyocell fiber treated in step S2, 7-20wt% of polyester fiber filaments and the balance of chitin fiber, and then perform wool mixing, carding and pre-drawing processes in sequence to obtain the first fiber pre-drawing; S4 Premix long-staple cotton and fine-staple cotton, and after mixing evenly, add them into hot water at 85-90°C for soaking pretreatment for 10-15min, and take them out and air dry naturally after the soaking pretreatment is completed; S5 Add the air-dried pre-mixed cotton into a container, and add warm water at 40-45°C and keep it. According to the water consumption in the container, sequentially add penetrant FKS at 0.5-1g / L, sodium hydroxide at 2-3g / L, 1mol / L acetic acid at 10-30ml / L, and carboxymethyl cellulose at 0.3-0.5g / L. The above-mentioned medicaments are added in sequence, and the addition interval is not less than 5min. After adding carboxymethyl cellulose, raise the water temperature to 90-95°C and keep it for 30-45min to make the pre-mixed cotton fully soaked, then take out the soaked pre-mixed cotton and dry it to obtain pre-mixed cotton fiber; S6 Immerse the pre-mixed cotton fiber treated in step S5 in a silver glycine nitrate chelate soaking solution for 6-8h, then put it into nano-titanium dioxide sol, and perform ultrasonic dispersion treatment for 20-30min at a device power of 300-400W, then extrude the excess sol, rinse with running water for 10-20S and then dry with hot air; S7 Mix 75-85wt% of the pre-mixed cotton fiber treated in step S6 with the balance of viscose fiber, and then perform carding and pre-drawing processes in sequence to obtain the second fiber pre-drawing; S8 Obtain the third fiber pre-drawing by subjecting the skin-friendly fiber to mixing, opening and cleaning cotton processes and carding processes in sequence; S9 Treat the first fiber pre-drawing, the second fiber pre-drawing, and the third fiber pre-drawing on a carding machine in a ratio of 1:1:1 to obtain a mixed carded sliver. After sequentially passing the mixed carded sliver through drawing, roving, and spinning processes, perform automatic doffing treatment to obtain the finished yarn.

2. The preparation method of flexible antibacterial yarns according to claim 1, characterized in that, The method of performing rapid cooling treatment in step S1 is to soak in ice water for 120 - 150 min.

3. The method for preparing the flexible antibacterial yarn according to claim 1, characterized in that, the method of performing rapid cooling treatment in step S1 is to maintain at a temperature of -18 to -25 °C for 30 - 50 min.

4. The method for preparing the flexible antibacterial yarn according to claim 1, characterized in that, in step S2, the preparation method of the silver glycine chelate soaking solution is as follows: Weigh 10 parts by mass of glycine and 15 parts by mass of silver oxide as raw materials. Completely dissolve glycine in 300 - 500 parts by mass of deionized water, then adjust the pH value of the solution to below 4.2 with dilute nitric acid, then slowly add silver oxide, perform ultrasonic dispersion at an equipment power of 300 - 400 W, then slowly adjust the pH value to neutral, filter out the insoluble substances, and obtain the silver glycine chelate soaking solution.

5. The method for preparing the flexible antibacterial yarn according to claim 1, characterized in that, in step S2, the preparation method of the titanium dioxide sol is as follows: Add 9 parts by mass of tetrabutyl titanate and 12 parts by mass of glacial acetic acid to 150 - 300 parts by mass of deionized water, stir evenly, then add dilute nitric acid, adjust the pH value of the solution to below 5, stir and react at a temperature of 40 - 50 °C for 30 - 40 min, then naturally cool and age to obtain the titanium dioxide sol.

6. The method for preparing the flexible antibacterial yarn according to claim 1, characterized in that, when performing hot air drying treatment in step S2 and step S6, the hot air temperature is 45 - 50 °C and the wind speed is 5 - 6 m / s.

7. The method for preparing the flexible antibacterial yarn according to claim 1, characterized in that, in step S4, the mass ratio of long-staple cotton to fine-staple cotton is 3:1 - 5:

1.

8. The method for preparing the flexible antibacterial yarn according to claim 1, characterized in that, in step S8, the skin-friendly fiber is one of cotton fiber, hemp fiber, bamboo fiber, and wool fiber.

9. The method for preparing the flexible antibacterial yarn according to claim 1, characterized in that, in step S8, the skin-friendly fiber is cotton fiber or hemp fiber or bamboo fiber or wool fiber and a mixture fiber of any ratio with modal, polyester fiber, spandex, and Lycra.

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