Preparation method of antibacterial bamboo fiber underpants

Abstract

The invention relates to the technical field of underpants, in particular to a preparation method of antibacterial bamboo fiber underpants. The preparation method comprises the following steps: S1, preparing modified bamboo fibers; s2, preparing modified cotton fibers; s3, spinning yarns; s4, preparing antibacterial yarns: dipping the yarns in an antibacterial softening solution for 10 minutes, and then baking the dipped yarns at 110 DEG C for 1.5 hours to obtain antibacterial soft yarns; s5, weaving the cloth; s6, preparing the antibacterial bamboo fiber underpants. The antibacterial bamboo fiber underpants have remarkable advantages in the aspects of antibacterial performance, hygroscopicity, air permeability, softness, comfort, washing resistance, environment friendliness and the like, and have important application value.

Description

Technical Field

[0001] The present application relates to the technical field of underwear, and in particular to a method for preparing antibacterial bamboo fiber underwear. Background Art

[0002] Underwear, as a necessity in daily life, generally refers to close-fitting lower body underwear, which is divided into men's and women's. There are many styles according to different genders. Underwear is divided into T-backs, C-backs and V-backs according to shape. According to fabric, underwear is generally divided into pure cotton underwear, bamboo fiber underwear, blended underwear and modal underwear, etc.

[0003] Existing underwear often has poor air permeability and does not absorb moisture. In a humid and hot environment, it is most likely to breed bacteria, produce odor, and easily cause gynecological diseases. How to improve the air permeability and moisture absorption performance of underwear and avoid the breeding of bacteria and diseases is a technical problem that needs to be solved urgently. Summary of the invention

[0004] In response to the above defects or improvement needs of the prior art, the present application provides a method for preparing antibacterial bamboo fiber underwear. The bamboo fiber underwear of the present application has stable, efficient and long-lasting antibacterial properties, hygroscopicity and breathability, is comfortable and skin-friendly, and has good antibacterial properties after multiple washings, and has important application value in the field of underwear technology.

[0005] In the first aspect, the present application provides a method for preparing antibacterial bamboo fiber underwear, which adopts the following technical scheme: A method for preparing antibacterial bamboo fiber underwear comprises the following steps: S1. Preparation of modified bamboo fiber: using bamboo fiber as aggregate, using epichlorohydrin as a modifier, sodium methoxide as a ring-opening catalyst, and then using sodium hydroxide to promote ring closure, forming epoxy modification on the bamboo fiber to obtain modified bamboo fiber; S2, preparation of modified cotton fiber: according to the mass fraction, add the cotton fiber to the sodium hydroxide solution, then add the hydrogen peroxide solution, impregnate, add the wool keratin solution, epichlorohydrin ethanol solution, and magnesium chloride after the impregnation, heat the reaction in a water bath under a nitrogen atmosphere, and dry after the reaction to obtain the modified cotton fiber; S3, spinning yarn: the modified bamboo fiber, modified cotton fiber and spandex fiber are sequentially subjected to the processes of cleaning, carding, drawing, roving, spinning and winding, and then blended to obtain yarn; S4, preparing antibacterial yarn: dipping the yarn in the antibacterial softening liquid for 10 minutes, and then baking the dipped yarn at 110° C. for 1.5 hours to obtain the antibacterial soft yarn; S5, fabric weaving: the antibacterial soft yarn is subjected to weaving and dyeing and finishing processes to obtain fabric; S6. Preparing antibacterial bamboo fiber underwear: preparing the antibacterial bamboo fiber underwear according to the processing technology of conventional underwear.

[0006] By adopting the above technical scheme, the preparation method gives bamboo fiber underwear excellent antibacterial, moisture absorption and breathability through multiple steps, while maintaining good comfort and durability. Preparation of modified bamboo fiber: Through epichlorohydrin modification, bamboo fiber obtains good softness while retaining toughness, solving the problem of hard texture and poor recovery of native bamboo fiber. Preparation of modified cotton fiber: Sodium hydroxide and hydrogen peroxide are used to treat cotton fiber to roughen its surface, increase the water contact specific surface area, introduce more alcohol hydroxyl groups, and improve the reaction grafting rate. Subsequently, epichlorohydrin is used as a cross-linking agent to react with cotton fiber and wool keratin to form a cross-linked structure, which enhances the softness, skin adaptability and moisture absorption of cotton fiber, and also improves the washability of the fabric. Spinning yarn: Modified bamboo fiber, modified cotton fiber and spandex fiber are mixed, and yarn is made through cleaning, carding, drawing, roving, spun yarn and winding processes. This step ensures the uniformity and strength of the yarn. Preparation of antibacterial yarn: The yarn is impregnated with an antibacterial softening liquid containing octadecyl trimethyl ammonium chloride and a composite antibacterial agent. These ingredients work synergistically to enhance the antibacterial properties and softness of the fabric. The addition of octadecylamine, ethylene oxide, polyoxyethylene ether and ethanol further enhances the binding force between the antibacterial agent and the yarn, and improves the antibacterial durability and washability. Fabric weaving: The antibacterial soft yarn is made into fabric through weaving and dyeing processes, which ensures the structural stability and aesthetics of the fabric. Preparation of antibacterial bamboo fiber underwear: Finally, the finished product is made according to the conventional underwear processing technology. Due to the optimization of the previous steps, the final product has stable antibacterial properties, good moisture absorption and breathability, and a comfortable wearing experience. In summary, each step is optimized from the aspects of fiber performance, antibacterial effect and fabric feel through physical and chemical modification methods, and finally the high-quality characteristics of antibacterial bamboo fiber underwear are achieved.

[0007] Preferably, in step S1, the specific preparation method of the modified bamboo fiber comprises the following steps: S21, taking bamboo pulp, adding water to adjust the pulp concentration to 12-15%, adding it to the refiner, adjusting the refining gap to 0.1 mm, circulating the refining until the beating degree reaches 47°SR, using a scoop net to drain the water, and preparing ground fiber; S22. Mix the ground fiber and tetrahydrofuran, assist with ultrasonic dispersion, add epichlorohydrin and sodium methoxide solution, heat to 72°C and reflux for 2 hours, filter and take the filter cake, soak it in sodium hydroxide solution, remove the supernatant, add water and wash repeatedly until neutral, then dry to constant weight and disperse to obtain modified bamboo fiber.

[0008] By adopting the above technical scheme, in the preparation process of modified bamboo fiber, epichlorohydrin is used as a modifier, sodium methoxide is used as a ring-opening catalyst, and sodium hydroxide is used to promote the closed loop, so that the surface of the bamboo fiber is epoxy-modified. This modification method can improve the softness and toughness of the bamboo fiber while maintaining its good antibacterial properties. The modified bamboo fiber has better hygroscopicity and breathability, which is a very important characteristic for underwear products and can improve the comfort of the wearer. The modified bamboo fiber also has good water washability, which means that after multiple washings, the underwear can still maintain good antibacterial properties and comfort. By blending with other fibers (such as cotton fibers), the softness and comfort of the underwear can be further improved while maintaining its antibacterial properties. In the entire preparation process, environmentally friendly chemicals and processes are used, which meets the requirements of sustainable development.

[0009] Preferably, in step S22, the ratio of the ground fiber, epichlorohydrin, sodium methoxide and tetrahydrofuran is 10 g:28 mL:0.13 g:220 mL.

[0010] Preferably, in step S2, the fineness of the cotton fiber is 20-25tex; the concentration of the sodium hydroxide solution is 0.5-1mol / L, the mass concentration of the hydrogen peroxide solution is 10-20%, the mass concentration of the wool keratin solution is 15-25%, the mass concentration of the epichlorohydrin ethanol solution is 20-30%, the immersion temperature is 30-40°C, and the time is 2-3h; the temperature of the water bath heating reaction is 85°C, and the time is 4h.

[0011] By adopting the above technical scheme, the cotton fiber is treated with alkali to roughen the surface of the cotton fiber, expand the contact specific surface area between water and cotton fiber, and at the same time make the cotton fiber surface have more alcohol hydroxyl groups, thereby improving the reaction grafting rate. Then, epichlorohydrin is used as a cross-linking agent. Epichlorohydrin can react with hydroxyl groups on viscose fiber and amino groups, thiol groups and other groups on wool keratin, thereby forming a cross-linking effect between cotton fiber and wool keratin. Wool keratin is a natural protein, which is harmless to human skin and skin-friendly. It not only makes the cotton fiber have better softness, skin adaptability and hygroscopicity, thereby improving the touch and quality of the fabric, but also through the action of chemical bonds, the fabric has better water wash resistance, thereby improving the service life of the underwear.

[0012] Preferably, in step S2, the mass ratio of the cotton fiber, the sodium hydroxide solution, the hydrogen peroxide solution, the wool keratin solution, the epichlorohydrin ethanol solution, and the magnesium chloride is 100:1000:220:150:60:4.

[0013] Preferably, in step S4, the antibacterial softening liquid comprises the following raw materials, measured by weight: 13 parts of antibacterial softener and 87 parts of water.

[0014] Preferably, the antibacterial softener comprises the following raw materials, by weight: 6-7 parts of octadecyltrimethylammonium chloride, 3-4 parts of composite antibacterial agent, 4-5 parts of octadecylamine, 2-4 parts of ethylene oxide, 2-3 parts of polyoxyethylene ether, 45-50 parts of ethanol and 20-25 parts of deionized water.

[0015] By adopting the above technical scheme, octadecyl trimethyl ammonium chloride: as a cationic surfactant, it has antibacterial properties and can destroy bacterial cell membranes, causing bacterial death. When used in conjunction with a composite antibacterial agent, the antibacterial effect can be enhanced while improving the softness of the fabric. Composite antibacterial agents: usually contain a variety of antibacterial ingredients, which can be broad-spectrum antibacterial and have inhibitory effects on different types of bacteria, fungi and molds. When used in conjunction with octadecyl trimethyl ammonium chloride, a synergistic antibacterial effect can be produced, improving the broad spectrum and durability of antibacterial. Octadecylamine: can improve the feel of the fabric, making it more: as a softener, it is softer and more comfortable. When used in conjunction with ethylene oxide and polyoxyethylene ether, the softness and hygroscopicity of the fabric can be further enhanced. Ethylene oxide: as a cross-linking agent, it can react with the hydroxyl groups on the fiber to form a stable chemical bond, improving the washability and durability of the fabric. When used in conjunction with polyoxyethylene ether, the wear resistance and antibacterial persistence of the fabric can be enhanced. Polyoxyethylene ether: as a nonionic surfactant, it can reduce the surface tension of the liquid and enhance the permeability and wettability of the solution. When used in combination with ethylene oxide and octadecylamine, the softness and hygroscopicity of the fabric can be improved, while the adhesion of the antibacterial agent can be enhanced. Ethanol: As a solvent, it can dissolve and disperse various antibacterial and softening ingredients, making the solution uniform and stable. Through the synergistic effect of the above ingredients, the antibacterial softening liquid can not only give the underwear good antibacterial properties, but also significantly improve its softness, hygroscopicity and breathability, while ensuring that these excellent properties can be maintained after multiple washings. This comprehensive performance makes the modified bamboo fiber underwear outstanding in comfort and durability, and has important market application value.

[0016] Preferably, the composite antibacterial agent is composed of chitosan quaternary ammonium salt and polyhexamethylene biguanide hydrochloride in a mass ratio of 2:1.

[0017] By adopting the above technical scheme, chitosan quaternary ammonium salt has good antibacterial properties, destroys the cell membrane of bacteria, and causes the death of bacteria. Chitosan is a natural polysaccharide with good biocompatibility and biodegradability, and is harmless to human skin. Chitosan quaternary ammonium salt can absorb moisture, enhance the hygroscopicity of fibers, and improve wearing comfort. Polyhexamethylene biguanide hydrochloride has a broad-spectrum antibacterial property and has a certain inhibitory effect on bacteria, fungi and viruses. This ingredient can form a lasting antibacterial layer on the fiber surface to improve the durability of the antibacterial property. Polyhexamethylene biguanide hydrochloride is non-toxic and harmless to human skin, safe and reliable. The combination of chitosan quaternary ammonium salt and polyhexamethylene biguanide hydrochloride can produce a synergistic antibacterial effect and significantly improve the antibacterial performance. The cell membrane destruction effect of chitosan quaternary ammonium salt combined with the broad-spectrum antibacterial property of polyhexamethylene biguanide hydrochloride makes the antibacterial effect more comprehensive and efficient. The combination of the two not only improves the antibacterial effect, but also enhances the durability and stability of the antibacterial layer. The hygroscopicity of chitosan quaternary ammonium salt and the persistence of polyhexamethylene biguanide hydrochloride work together to ensure that the antibacterial performance can be maintained after multiple washings. Chitosan quaternary ammonium salt and polyhexamethylene biguanide hydrochloride are both safe and non-toxic ingredients. Their combined use not only improves the antibacterial performance, but also ensures the comfort and safety of the product. The biocompatibility of chitosan and the safety of polyhexamethylene biguanide make this composite antibacterial agent suitable for long-term close-fitting wear. In short, through the synergistic effect of chitosan quaternary ammonium salt and polyhexamethylene biguanide hydrochloride, the application of the composite antibacterial agent in antibacterial bamboo fiber underwear not only improves the antibacterial effect, but also enhances the persistence and stability of antibacterial, while ensuring the comfort and safety of the product. The application of this composite antibacterial agent enables the underwear to maintain good antibacterial performance after multiple washings, and has important market application value.

[0018] Preferably, the method for preparing the antibacterial softening liquid comprises the following steps: S91. Mix octadecyltrimethylammonium chloride and deionized water according to their weight fractions, heat to 50° C., stir for 10 minutes, then add the composite antibacterial agent, heat to 60° C., stir for 30 minutes to obtain an antibacterial solution; S92. Stir octadecylamine, ethylene oxide, polyoxyethylene ether and ethanol uniformly according to their weight proportions to obtain a softening liquid, and then add the antibacterial liquid into the softening liquid and stir for 30 minutes to obtain an antibacterial softening liquid.

[0019] Preferably, the mass ratio of the modified bamboo fiber, modified cotton fiber and is 68:28:7, wherein the fineness of the spandex fiber is 25tex.

[0020] In summary, the beneficial technical effects of this application are: 1. Antibacterial properties: The combination of modified bamboo fiber and modified cotton fiber, plus the treatment of antibacterial softening liquid, makes the underwear have stable, efficient and lasting antibacterial properties. This antibacterial property is still effective after multiple washings, significantly improving the durability and hygiene of the underwear.

[0021] 2. Hygroscopicity and air permeability: Both modified bamboo fiber and modified cotton fiber have good hygroscopicity and air permeability. In particular, the surface of modified cotton fiber is roughened by alkali treatment and cross-linking agent, which increases the contact surface area between water and fiber, thereby improving hygroscopicity.

[0022] 3. Softness and comfort: The treatment of modified bamboo fiber and modified cotton fiber makes them softer and more comfortable. In particular, the cross-linking of modified cotton fiber and wool keratin makes it softer and more skin-friendly, improving the touch and quality of the fabric.

[0023] 4. Washability: Through the action of chemical bonds, modified fibers and antibacterial agents can better combine with the fabric, improving the washability of the fabric and thus extending the service life of the underwear.

[0024] 5. Environmental protection: The modifiers and antibacterial agents used are all environmentally friendly materials, such as epichlorohydrin, wool keratin, etc., which are harmless to human skin and skin-friendly, in line with the concept of green production and healthy consumption. DETAILED DESCRIPTION

[0025] The embodiments of the present application will be described in detail below in conjunction with the examples, but it will be appreciated by those skilled in the art that the following examples are only used to illustrate the present application and should not be considered as limiting the scope of the present application. In the examples, if specific conditions are not specified, they are carried out according to normal conditions or the conditions recommended by the manufacturer. If the manufacturer is not specified for the reagents or instruments used, they are all conventional products that can be purchased commercially.

[0026] In the following examples, 1 portion means 1000 g.

[0027] Example 1 A method for preparing antibacterial bamboo fiber underwear comprises the following steps: S1. Preparation of modified bamboo fiber: The specific preparation method of the modified bamboo fiber comprises the following steps: S21, taking bamboo pulp, adding water to adjust the pulp concentration to 12%, adding it to the refiner, adjusting the refining gap to 0.1 mm, circulating the refining until the beating degree reaches 47°SR, using a scoop net to drain the water, and preparing ground fiber; S22, take the ground fiber and tetrahydrofuran and mix them, assist with 33kHz ultrasonic dispersion for 25min to form a uniform dispersion, then add epichlorohydrin and methanol solution of sodium methoxide, heat the reaction system to 72°C, and reflux at this temperature for 1.5h. In the above reaction, the amount ratio of ground fiber, epichlorohydrin, sodium methoxide and tetrahydrofuran is controlled to be 10g:28mL:0.13g:220mL. After the reaction is completed, filter, take out the filter cake and soak it in 0.1mol / L sodium hydroxide solution for 5h, remove the supernatant, add water and wash repeatedly until neutral, filter the filter cake and place it in a vacuum drying oven, dry it at 60°C to constant weight, and disperse it using an air flow disperser to obtain modified bamboo fiber; S2, preparation of modified cotton fiber: according to the mass fraction, 100 parts of cotton fiber with a fineness of 20 tex are added to 1000 parts of a sodium hydroxide solution with a concentration of 0.5 mol / L, and then 220 parts of a hydrogen peroxide solution with a mass concentration of 10% are added, and the mixture is immersed at 30°C for 3 hours. After the immersion is completed, 150 parts of a wool keratin solution with a mass concentration of 15%, 60 parts of an epichlorohydrin ethanol solution with a mass concentration of 20%, and 4 parts of magnesium chloride are added, and the mixture is reacted in a water bath at 85°C in a nitrogen atmosphere for 4 hours. After the reaction is completed, the mixture is dried to obtain modified cotton fiber; S3. Spinning yarn: subjecting the modified bamboo fiber, modified cotton fiber and spandex fiber to the processes of cleaning, carding, drawing, roving, spinning and winding in sequence, and then blending to obtain yarn; wherein the mass ratio of the modified bamboo fiber, modified cotton fiber and is 68:28:7, and the fineness of the spandex fiber is 25 tex.

[0028] S4, preparing antibacterial yarn: dipping the yarn in the antibacterial softening liquid for 10 minutes, and then baking the dipped yarn at 110° C. for 1.5 hours to obtain the antibacterial soft yarn; S5, fabric weaving: the antibacterial soft yarn is subjected to weaving and dyeing and finishing processes to obtain fabric; S6, preparing antibacterial bamboo fiber underwear: preparing antibacterial bamboo fiber underwear according to the processing technology of conventional underwear; Wherein, in step S4, the antibacterial softening liquid, by weight, comprises the following raw materials: 13 parts of antibacterial softener and 87 parts of water; the antibacterial softener, by weight, comprises the following raw materials: 6 parts of octadecyltrimethylammonium chloride, 3 parts of composite antibacterial agent, 4 parts of octadecylamine, 2 parts of ethylene oxide, 2 parts of polyoxyethylene ether, 45 parts of ethanol and 20 parts of deionized water; the composite antibacterial agent is composed of chitosan quaternary ammonium salt and polyhexamethylene biguanide hydrochloride in a weight ratio of 2:1; the preparation method of the antibacterial softening liquid comprises the following steps: S91. Mix octadecyltrimethylammonium chloride and deionized water according to their weight fractions, heat to 50° C., stir for 10 minutes, then add the composite antibacterial agent, heat to 60° C., stir for 30 minutes to obtain an antibacterial solution; S92. Stir octadecylamine, ethylene oxide, polyoxyethylene ether and ethanol uniformly according to their weight proportions to obtain a softening liquid, and then add the antibacterial liquid into the softening liquid and stir for 30 minutes to obtain an antibacterial softening liquid.

[0029] Example 2 A method for preparing antibacterial bamboo fiber underwear comprises the following steps: S1. Preparation of modified bamboo fiber: The specific preparation method of the modified bamboo fiber comprises the following steps: S21, taking bamboo pulp, adding water to adjust the pulp concentration to 15%, adding it to the refiner, adjusting the refining gap to 0.1 mm, circulating the refining until the beating degree reaches 47°SR, using a scoop net to drain the water, and preparing ground fiber; S22, take the ground fiber and tetrahydrofuran and mix them, assist with 33kHz ultrasonic dispersion for 25min to form a uniform dispersion, then add epichlorohydrin and methanol solution of sodium methoxide, heat the reaction system to 72°C, and reflux at this temperature for 1.5h. In the above reaction, the amount ratio of ground fiber, epichlorohydrin, sodium methoxide and tetrahydrofuran is controlled to be 10g:28mL:0.13g:220mL. After the reaction is completed, filter, take out the filter cake and soak it in 0.1mol / L sodium hydroxide solution for 5h, remove the supernatant, add water and wash repeatedly until neutral, filter the filter cake and place it in a vacuum drying oven, dry it at 60°C to constant weight, and disperse it using an air flow disperser to obtain modified bamboo fiber; S2, preparation of modified cotton fiber: according to the mass fraction, 100 parts of cotton fiber with a fineness of 25 tex are added to 1000 parts of sodium hydroxide solution with a concentration of 1 mol / L, and then 220 parts of hydrogen peroxide solution with a mass concentration of 20% are added, and the mixture is immersed at 40°C for 2 hours. After the immersion is completed, 150 parts of wool keratin solution with a mass concentration of 25%, 60 parts of epichlorohydrin ethanol solution with a mass concentration of 30%, and 4 parts of magnesium chloride are added, and the mixture is reacted in a water bath at 85°C in a nitrogen atmosphere for 4 hours. After the reaction is completed, the mixture is dried to obtain modified cotton fiber; S3. Spinning yarn: subjecting the modified bamboo fiber, modified cotton fiber and spandex fiber to the processes of cleaning, carding, drawing, roving, spinning and winding in sequence, and then blending to obtain yarn; wherein the mass ratio of the modified bamboo fiber, modified cotton fiber and is 68:28:7, and the fineness of the spandex fiber is 25 tex.

[0030] S4, preparing antibacterial yarn: dipping the yarn in the antibacterial softening liquid for 10 minutes, and then baking the dipped yarn at 110° C. for 1.5 hours to obtain the antibacterial soft yarn; S5, fabric weaving: the antibacterial soft yarn is subjected to weaving and dyeing and finishing processes to obtain fabric; S6, preparing antibacterial bamboo fiber underwear: preparing antibacterial bamboo fiber underwear according to the processing technology of conventional underwear; Wherein, in step S4, the antibacterial softening liquid, by weight, comprises the following raw materials: 13 parts of antibacterial softener and 87 parts of water; the antibacterial softener, by weight, comprises the following raw materials: 7 parts of octadecyltrimethylammonium chloride, 4 parts of composite antibacterial agent, 5 parts of octadecylamine, 4 parts of ethylene oxide, 3 parts of polyoxyethylene ether, 50 parts of ethanol and 25 parts of deionized water; the composite antibacterial agent is composed of chitosan quaternary ammonium salt and polyhexamethylene biguanide hydrochloride in a weight ratio of 2:1; the preparation method of the antibacterial softening liquid comprises the following steps: S91. Mix octadecyltrimethylammonium chloride and deionized water according to their weight fractions, heat to 50° C., stir for 10 minutes, then add the composite antibacterial agent, heat to 60° C., stir for 30 minutes to obtain an antibacterial solution; S92. Stir octadecylamine, ethylene oxide, polyoxyethylene ether and ethanol uniformly according to their weight proportions to obtain a softening liquid, and then add the antibacterial liquid into the softening liquid and stir for 30 minutes to obtain an antibacterial softening liquid.

[0031] Example 3 A method for preparing antibacterial bamboo fiber underwear comprises the following steps: S1. Preparation of modified bamboo fiber: The specific preparation method of the modified bamboo fiber comprises the following steps: S21, taking bamboo pulp, adding water to adjust the pulp concentration to 13%, adding it to the refiner, adjusting the refining gap to 0.1 mm, circulating the refining until the beating degree reaches 47°SR, using a scoop net to drain the water, and preparing ground fiber; S22, take the ground fiber and tetrahydrofuran and mix them, assist with 33kHz ultrasonic dispersion for 25min to form a uniform dispersion, then add epichlorohydrin and methanol solution of sodium methoxide, heat the reaction system to 72°C, and reflux at this temperature for 1.5h. In the above reaction, the amount ratio of ground fiber, epichlorohydrin, sodium methoxide and tetrahydrofuran is controlled to be 10g:28mL:0.13g:220mL. After the reaction is completed, filter, take out the filter cake and soak it in 0.1mol / L sodium hydroxide solution for 5h, remove the supernatant, add water and wash repeatedly until neutral, filter the filter cake and place it in a vacuum drying oven, dry it at 60°C to constant weight, and disperse it using an air flow disperser to obtain modified bamboo fiber; S2, preparation of modified cotton fiber: according to the mass fraction, 100 parts of cotton fiber with a fineness of 23 tex were added to 1000 parts of a sodium hydroxide solution with a concentration of 0.8 mol / L, followed by adding 220 parts of a hydrogen peroxide solution with a mass concentration of 15%, and immersed at 35°C for 2.3 hours. After the immersion, 150 parts of a wool keratin solution with a mass concentration of 20%, 60 parts of an epichlorohydrin ethanol solution with a mass concentration of 25%, and 4 parts of magnesium chloride were added, and the mixture was reacted in a water bath at 85°C in a nitrogen atmosphere for 4 hours. After the reaction was completed, the mixture was dried to obtain modified cotton fiber; S3. Spinning yarn: subjecting the modified bamboo fiber, modified cotton fiber and spandex fiber to the processes of cleaning, carding, drawing, roving, spinning and winding in sequence, and then blending to obtain yarn; wherein the mass ratio of the modified bamboo fiber, modified cotton fiber and is 68:28:7, and the fineness of the spandex fiber is 25 tex.

[0032] S4, preparing antibacterial yarn: dipping the yarn in the antibacterial softening liquid for 10 minutes, and then baking the dipped yarn at 110° C. for 1.5 hours to obtain the antibacterial soft yarn; S5, fabric weaving: the antibacterial soft yarn is subjected to weaving and dyeing and finishing processes to obtain fabric; S6, preparing antibacterial bamboo fiber underwear: preparing antibacterial bamboo fiber underwear according to the processing technology of conventional underwear; Wherein, in step S4, the antibacterial softening liquid, by weight, comprises the following raw materials: 13 parts of antibacterial softener and 87 parts of water; the antibacterial softener, by weight, comprises the following raw materials: 6.7 parts of octadecyltrimethylammonium chloride, 3.4 parts of composite antibacterial agent, 4.5 parts of octadecylamine, 3 parts of ethylene oxide, 2.5 parts of polyoxyethylene ether, 47 parts of ethanol and 23 parts of deionized water; the composite antibacterial agent is composed of chitosan quaternary ammonium salt and polyhexamethylene biguanide hydrochloride in a weight ratio of 2:1; the preparation method of the antibacterial softening liquid comprises the following steps: S91. Mix octadecyltrimethylammonium chloride and deionized water according to their weight fractions, heat to 50° C., stir for 10 minutes, then add the composite antibacterial agent, heat to 60° C., stir for 30 minutes to obtain an antibacterial solution; S92. Stir octadecylamine, ethylene oxide, polyoxyethylene ether and ethanol uniformly according to their weight proportions to obtain a softening liquid, and then add the antibacterial liquid into the softening liquid and stir for 30 minutes to obtain an antibacterial softening liquid.

[0033] Comparative Example 1 The same as Example 3, except that step S2, preparation of modified cotton fiber, is omitted, and an equal amount of 23 tex cotton fiber is used to replace the modified cotton fiber in step S3.

[0034] Comparative Example 2 The same as Example 3, except that step S1, preparation of modified bamboo fiber is omitted, and an equal amount of 25 tex bamboo fiber is used to replace the modified bamboo fiber in step S3.

[0035] Comparative Example 3 The same as Example 3, except that in step S4, the composite antibacterial agent is chitosan quaternary ammonium salt.

[0036] Comparative Example 4 The same as Example 3, except that in step S4, the composite antibacterial agent is polyhexamethylene biguanide hydrochloride.

[0037] Performance Test The bamboo fiber underwear prepared in Examples 1 to 3 and Comparative Examples 1 to 4 were sampled and the following tests were performed. The test results are shown in Table 1. Air permeability: Referring to GB / T5453-1997 Determination of air permeability of textile fabrics, the air permeability of bamboo fiber underwear was tested; the test results are shown in Table 1; Moisture permeability: Referring to GB / T12704.1-2009 Test method for moisture permeability of textile fabrics, the moisture permeability of bamboo fiber underwear was tested using the moisture absorption method; the test results are shown in Table 1; Antibacterial rate: The antibacterial rate of Staphylococcus aureus was determined using the national standard GB / T20944.2-2007 "Evaluation of antibacterial properties of textiles - Part 2: Absorption method"; the test results are shown in Table 1; Moisture regain: Refer to GB / T9995-1997 "Determination of moisture content and moisture regain of textile materials - Oven drying method" to test the moisture regain. The greater the moisture regain, the better the hygroscopicity of the fabric. The test results are shown in Table 1. Durability: The antibacterial rate was determined using the same standard before and after the sample was washed 50 times. The test results are shown in Table 1.

[0038] Table 1 Performance test Analyzing the data in Table 1, we can see that: 1) The bamboo fiber underwear prepared in Examples 1 to 3 has stable, efficient and long-lasting antibacterial properties, hygroscopicity and breathable moisture permeability, and is comfortable and skin-friendly. It also has good antibacterial properties after multiple washings, and has important application value in the field of underwear technology.

[0039] 2) The comparative analysis of the performance of the bamboo fiber underwear prepared in combination with Example 3 and Comparative Example 1 shows that the cotton fiber prepared in the present application is modified by alkali treatment of the cotton fiber to roughen the surface of the cotton fiber, expand the contact specific surface area between water and the cotton fiber, and at the same time make the cotton fiber surface have more alcohol hydroxyl groups, thereby improving the reaction grafting rate. Then, epichlorohydrin is used as a cross-linking agent. Epichlorohydrin can react with the hydroxyl groups on the viscose fiber and with the amino, thiol and other groups on the wool keratin, thereby forming a cross-linking effect between the cotton fiber and the wool keratin. Wool keratin is a natural protein, which is harmless to human skin and skin-friendly. It not only makes the cotton fiber have better softness, skin adaptability and hygroscopicity, thereby improving the touch and quality of the fabric, but also through the action of chemical bonds, the fabric has better water washability, thereby improving the service life of the underwear.

[0040] 3) The performance comparison analysis of the bamboo fiber underwear prepared in combination with Example 3 and Comparative Example 2 shows that the modified bamboo fiber prepared in the present application, by using epichlorohydrin as a modifier, sodium methoxide as a ring-opening catalyst, and then promoting the closed loop by sodium hydroxide, forms epoxy modification on the surface of the bamboo fiber. This modification method can improve the softness and toughness of the bamboo fiber while maintaining its good antibacterial properties. The modified bamboo fiber has better hygroscopicity and air permeability, which is a very important characteristic for underwear products and can improve the comfort of the wearer. The modified bamboo fiber also has good water washability, which means that after multiple washings, the underwear can still maintain good antibacterial properties and comfort.

[0041] 4) The performance comparison analysis of the bamboo fiber underwear prepared in combination with Example 3 and Comparative Examples 3-4 shows that the composite antibacterial agent is composed of chitosan quaternary ammonium salt and polyhexamethylene biguanide hydrochloride in a mass ratio of 2:1. The synergistic effect between them not only improves the antibacterial effect, but also enhances the durability and stability of the antibacterial effect, while ensuring the comfort and safety of the product. The application of this composite antibacterial agent enables the underwear to maintain good antibacterial properties after multiple washings, and has important market application value.

[0042] The above embodiments are only used to explain the technical solutions of the present application rather than to limit them. Although the above embodiments provide a specific description of the present application, relevant technical personnel should understand that the specific implementation methods of the present application can still be modified or replaced by equivalents, and any modifications and equivalent replacements that do not depart from the spirit and scope of the present application should be included in the protection scope of the present application.

Claims

1. A method for preparing antibacterial bamboo fiber underwear, characterized in that: The following steps are involved: S1. Preparation of modified bamboo fiber: using bamboo fiber as aggregate, using epichlorohydrin as a modifier, sodium methoxide as a ring-opening catalyst, and then using sodium hydroxide to promote ring closure, forming epoxy modification on the bamboo fiber to obtain modified bamboo fiber; S2, preparation of modified cotton fiber: according to the mass fraction, add the cotton fiber to the sodium hydroxide solution, then add the hydrogen peroxide solution, impregnate, add the wool keratin solution, epichlorohydrin ethanol solution, and magnesium chloride after the impregnation, heat the reaction in a water bath under a nitrogen atmosphere, and dry after the reaction to obtain the modified cotton fiber; S3, spinning yarn: the modified bamboo fiber, modified cotton fiber and spandex fiber are sequentially subjected to the processes of cleaning, carding, drawing, roving, spinning and winding, and then blended to obtain yarn; S4, preparing antibacterial yarn: dipping the yarn in the antibacterial softening liquid for 10 minutes, and then baking the dipped yarn at 110° C. for 1.5 hours to obtain the antibacterial soft yarn; S5, fabric weaving: the antibacterial soft yarn is subjected to weaving and dyeing and finishing processes to obtain fabric; S6. Preparing antibacterial bamboo fiber underwear: preparing the antibacterial bamboo fiber underwear according to the processing technology of conventional underwear.

2. The method for preparing antibacterial bamboo fiber underwear according to claim 1, characterized in that: In step S1, the specific preparation method of the modified bamboo fiber includes the following steps: S21, taking bamboo pulp, adding water to adjust the pulp concentration to 12-15%, adding it to the refiner, adjusting the refining gap to 0.1 mm, cyclic refining until the beating degree reaches 47°SR, using a scoop net to drain the water, and preparing ground fiber; S22. Mix the ground fiber and tetrahydrofuran, assist with ultrasonic dispersion, add epichlorohydrin and sodium methoxide solution, heat to 72°C and reflux for 2 hours, filter and take the filter cake, soak it in sodium hydroxide solution, remove the supernatant, add water and wash repeatedly until neutral, then dry to constant weight and disperse to obtain modified bamboo fiber.

3. The method for preparing antibacterial bamboo fiber underwear according to claim 2, characterized in that: In step S22, the ratio of the ground fiber, epichlorohydrin, sodium methoxide and tetrahydrofuran is 10 g:28 mL:0.13 g:220 mL.

4. The method for preparing antibacterial bamboo fiber underwear according to claim 1, characterized in that: In step S2, the fineness of the cotton fiber is 20-25tex; the concentration of the sodium hydroxide solution is 0.5-1mol / L, the mass concentration of the hydrogen peroxide solution is 10-20%, the mass concentration of the wool keratin solution is 15-25%, the mass concentration of the epichlorohydrin ethanol solution is 20-30%, the immersion temperature is 30-40°C, and the time is 23h; the temperature of the water bath heating reaction is 85°C, and the time is 4h.

5. The method for preparing antibacterial bamboo fiber underwear according to claim 1, characterized in that: In step S2, the mass ratio of the cotton fiber, the sodium hydroxide solution, the hydrogen peroxide solution, the wool keratin solution, the epichlorohydrin ethanol solution, and the magnesium chloride is 100:1000:220:150:60:

4.

6. The method for preparing antibacterial bamboo fiber underwear according to claim 1, characterized in that: In step S4, the antibacterial softening liquid includes the following raw materials, measured by weight: 13 parts of antibacterial softener and 87 parts of water.

7. The method for preparing antibacterial bamboo fiber underwear according to claim 6, characterized in that: The antibacterial softener comprises the following raw materials, by weight: 6-7 parts of octadecyltrimethylammonium chloride, 3-4 parts of composite antibacterial agent, 4-5 parts of octadecylamine, 2-4 parts of ethylene oxide, 2-3 parts of polyoxyethylene ether, 45-50 parts of ethanol and 20-25 parts of deionized water.

8. The method for preparing antibacterial bamboo fiber underwear according to claim 7, characterized in that: The composite antibacterial agent is composed of chitosan quaternary ammonium salt and polyhexamethylene biguanide hydrochloride in a mass ratio of 2:

1.

9. The method for preparing antibacterial bamboo fiber underwear according to claim 6, characterized in that: The preparation method of the antibacterial softening liquid comprises the following steps: S91. Mix octadecyltrimethylammonium chloride and deionized water according to their weight fractions, heat to 50° C., stir for 10 minutes, then add the composite antibacterial agent, heat to 60° C., stir for 30 minutes to obtain an antibacterial solution; S92. Stir octadecylamine, ethylene oxide, polyoxyethylene ether and ethanol uniformly according to their weight proportions to obtain a softening liquid, and then add the antibacterial liquid into the softening liquid and stir for 30 minutes to obtain an antibacterial softening liquid.

10. The method for preparing antibacterial bamboo fiber underwear according to claim 1, characterized in that: The mass ratio of the modified bamboo fiber, modified cotton fiber and is 68:28:7, wherein the fineness of the spandex fiber is 25tex.

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