Preparation method of skin-friendly breathable cotton fabric

Abstract

The invention relates to the technical field of cotton fabrics, and discloses a preparation method of a skin-friendly breathable cotton fabric, the cotton fabric is formed by weaving cotton yarn and functional polyester fiber and cotton fiber blended yarn, the wrinkle resistance of the fabric is improved, the functional polyester fiber comprises alumina grafted antibacterial agent filler and a surface grafted silicone oil molecular chain, and the functional polyester fiber has the antibacterial function. Wherein the aluminum oxide grafted antibacterial agent filler is prepared by grafting a biguanide antibacterial agent on the surface of aluminum oxide, nano aluminum oxide has a good reinforcing effect and can improve the fiber strength, the biguanide antibacterial agent has the broad-spectrum antibacterial characteristic and is good in washability and lasting in antibacterial effect, the surface grafted epoxy silicone oil can enhance the lubricity between fibers, and the antibacterial effect is lasting. The method has the advantages that the friction coefficient is reduced, the fabric feels soft, smooth and plump, the static accumulation can be reduced, the skin-friendly comfort is indirectly improved, and the fabric is woven into a latticed fabric, so that the fabric has good air permeability.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of cotton fabrics, in particular to a preparation method of a skin-friendly and breathable cotton fabric. BACKGROUND

[0002] As the first of the four natural fibers, cotton fiber has the characteristics of high strength, good heat resistance, alkali resistance and poor acid resistance, good air permeability, good hydrophilicity and easy dyeing, and is one of the most important textile raw materials in the world, which is deeply loved by consumers and is widely used in various textiles. With the continuous improvement of living standards and the enhancement of health consciousness, people's demand for functional modification or finishing of cotton fiber products is also increasing. At present, traditional cotton fabric textiles cannot meet the needs of people in daily life. As a garment fabric that is in close contact with the human body, on the one hand, it needs to have physical properties such as skin-friendliness and air permeability to meet human ergonomics and wearing experience, and on the other hand, it also needs to have functions such as antibacterial property, which is directly related to people's health and health. Since cotton fiber itself has the disadvantages of poor wrinkle resistance, easy breeding of bacteria and lack of antibacterial property, therefore, developing cotton fabric that has skin-friendliness, air permeability and efficient antibacterial function has become an important direction of innovation in the textile industry.

[0003] Polyester fiber has excellent wrinkle resistance and shape retention, and is not easy to wrinkle during wearing. Blending with cotton fiber can solve the problem of poor wrinkle resistance of cotton fabric, but the skin-friendliness of polyester fabric is poor. According to the application number CN201610372244.1, a preparation method of an environmentally friendly skin-friendly polyester oregan fabric is disclosed, which modifies the polyester fiber by adding expanded vermiculite powder, plant dye and pearl powder, and the woven fabric has very good skin-friendliness. The application number CN202211697459.2 discloses an antibacterial polyester staple fiber, which uses modified graphene material as an antibacterial agent for the polyester material system, thereby greatly improving the antibacterial property of the polyester fiber. Therefore, by adding functional fillers with skin-friendliness and antibacterial property to the polyester fiber, the performance of the polyester fiber can be improved, and then blended with cotton fiber to make fabric, which can improve the poor wrinkle resistance of cotton fabric and increase the antibacterial property. SUMMARY

[0004] The application aims to provide a skin-friendly and breathable cotton fabric and a preparation method thereof.

[0005] The application can be achieved by the following technical solutions.

[0006] A preparation method of a skin-friendly and breathable cotton fabric, the cotton fabric is formed by weaving warp yarns and weft yarns; the warp yarns are cotton yarns; the weft yarns are blended yarns of functionalized polyester fibers and cotton fibers; the mass ratio of the functionalized polyester fibers and the cotton fibers is 3-4:6-7.

[0007] The functionalized polyester fiber is made of the following raw materials measured by weight fraction:

[0008] 50-70 parts of skin-friendly modified polyester fiber chips, 2-4 parts of alumina grafted antibacterial agent filler, 8-10 parts of plasticizer, 1-3 parts of antioxidant;

[0009] The preparation method comprises the following steps:

[0010] Firstly, the functionalized polyester fiber and cotton fiber are mixed and spun into yarn through a spinning machine to obtain a blended yarn;

[0011] Secondly, the cotton yarn is used as warp yarn and the blended yarn is used as weft yarn, and a loom is used to interweave into a grid shape to form a gray cloth;

[0012] Thirdly, the gray cloth is first immersed in clean water and then subjected to setting and drying treatment to obtain a cotton fabric.

[0013] Further, in the second step, the warp density is 430 roots / 10 cm; and the weft density is 200 roots / 10 cm.

[0014] Further, the preparation method of the functionalized polyester fiber specifically comprises the following steps:

[0015] Step one, the skin-friendly modified polyester fiber chips, alumina grafted antibacterial agent filler, plasticizer and antioxidant are added into a mixer and stirred uniformly at a speed of 900-1100 r / min to obtain a premix;

[0016] Step two, the premix is placed in a screw extruder, and the process temperature is respectively 275-280℃ for the feeding zone, 285-290℃ for the melting zone, 285-290℃ for the metering zone, and 285-290℃ for the spinning assembly; after the temperature of all regions reaches the set value and stabilizes for 20-30 min, nitrogen gas is continuously introduced at a rate of 0.5-0.6 L / min;

[0017] Step three, start the screw rotation at a speed of 10-20 rpm to forwardly convey the melt; after the melt flow stabilizes, the melt is spun out through a spinneret, cooled and solidified by side blowing, and the side blowing conditions are set as follows: temperature 18-20℃, wind speed 0.7-0.9 m / s; after balancing, the yarn is subjected to stretching, crimping, relaxation and heat setting, and the winding speed is 1100-1150 m / min, the stretching multiple is 5-6, and the relaxation and heat setting temperature is 55-65℃ to obtain the functionalized polyester fiber.

[0018] Further, the preparation method of the skin-friendly modified polyester fiber chips comprises the following steps:

[0019] A1, evenly winding the polyester fiber on an aluminum alloy frame, placing it in a vacuum plasma treatment instrument reaction chamber, controlling the air pressure to be 200-300 Pa, the dielectric barrier discharge power to be 5-6 W, and treating the polyester fiber by plasma for 1-3 min to obtain a hydroxylated polyester fiber;

[0020] A2, taking the hydroxylated polyester fiber, adding it into toluene, uniformly dispersing it by ultrasonic, then adding epoxy silicone oil and a catalyst a, stirring uniformly, then increasing the temperature to 80-100℃, reacting for 5-7 h, filtering, and drying at 40-50℃ for 11-13 h to obtain a functionalized polyester fiber, then performing slicing treatment to obtain a skin-friendly modified polyester fiber slice.

[0021] Further, in A2, the catalyst a is benzyl dimethyl amine or triethylamine.

[0022] Further, the plasticizer is sodium gluconate or triethyl citrate, and the antioxidant is tris (2, 4-di-tert-butylphenyl) phosphite or 2, 6-di-tert-butyl-p-cresol.

[0023] Through the above technical solution, first, the polyester fiber is treated by vacuum plasma to make the surface of the polyester fiber have hydroxyl groups, and a hydroxylated polyester fiber is obtained, then, under the condition of a catalyst a and heating, the hydroxyl groups in the hydroxylated polyester fiber and the epoxy groups in the epoxy silicone oil undergo ring-opening reaction, the epoxy silicone oil is grafted to the surface of the polyester fiber, and a skin-friendly modified polyester fiber slice is obtained.

[0024] Further, the preparation method of the aluminum oxide grafted antibacterial agent filler specifically includes the following steps:

[0025] B1, taking nano-aluminum oxide, adding it into N, N-dimethylformamide, ultrasonic dispersing for 30-40 min to obtain a dispersion liquid, then taking 1, 6-hexane diisocyanate, adding it into the dispersion liquid, stirring uniformly, adding a catalyst b, heating to 60-80℃, and continuously stirring for 8-10 h to obtain modified aluminum oxide;

[0026] B2, taking the modified aluminum oxide, adding it into ion-free water, passing nitrogen, heating to 60-80℃, ultrasonic dispersing at the temperature for 40-50 min, filtering, and drying at 50-60℃ for 11-13 h to obtain amino-modified aluminum oxide;

[0027] B3, taking the amino-modified aluminum oxide, adding it into N, N-dimethylformamide, ultrasonic dispersing for 30-40 min to obtain a dispersion liquid, then taking dicyandiamide, adding it into the dispersion liquid, stirring and heating to 100-120℃, continuously stirring for 4-6 h, filtering, washing with ion-free water for 3-5 times, and drying at 40-50℃ for 10-12 h to obtain an aluminum oxide grafted antibacterial agent filler.

[0028] Further, in B1, the catalyst b is dibutyltin dilaurate or stannous octoate.

[0029] By the above technical solution, firstly, under the conditions of catalyst b and heating, the hydroxyl group on the surface of nano-alumina and the isocyanate group in 1,6-hexane diisocyanate undergo an urethane reaction, the isocyanate group is grafted on the surface of nano-alumina to obtain modified alumina, then under the conditions of nitrogen and heating, the isocyanate group is hydrolyzed into amino group in water, finally, under the action of heating, the amino group in the amino-modified alumina and the cyano group in dicyandiamide undergo a guanidination reaction to prepare a biguanide antibacterial agent, and the alumina grafted antibacterial filler is obtained.

[0030] The beneficial effects of the present application are:

[0031] (1) The alumina grafted antibacterial filler is prepared by grafting the biguanide antibacterial agent on the surface of nano-alumina. Nano-alumina has good reinforcing effect, which can improve the strength of polyester fiber and further improve the strength of the fabric, so that the fabric is not easy to break when subjected to external force. The biguanide antibacterial agent has the characteristics of broad-spectrum antibacterial property and good washing resistance, and the antibacterial effect is durable. The combination of the biguanide antibacterial agent and nano-alumina can improve the dispersibility of nano-alumina, reduce the polarity of the surface of alumina, and make the alumina grafted antibacterial filler better dispersed in the interior of polyester fiber, thereby improving the antibacterial efficiency.

[0032] (2) The surface of the functionalized polyester fiber is grafted with an epoxy silicone oil molecular chain. The epoxy silicone oil can enhance the lubricity between fibers, reduce the friction coefficient, and endow the fabric with soft, smooth and full characteristics. At the same time, the epoxy silicone oil can reduce the surface resistivity of polyester fiber and reduce the accumulation of static electricity, thereby indirectly improving the skin-friendly comfort.

[0033] (3) The prepared functionalized polyester fiber and cotton fiber are blended, and the blended cotton yarn is woven into a fabric. The fabric can effectively improve the antibacterial property and skin-friendliness of the fabric, and is woven into a grid shape, so that the fabric has good air permeability.

[0034] Of course, it is not necessary for any product implementing the present application to achieve all the advantages mentioned above. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0036] Preparation Example

[0037] Preparation of functionalized polyester fiber:

[0038] Step one, according to the weight fraction, take 50 parts of skin-friendly modified polyester fiber chips, 2 parts of alumina grafted antibacterial agent filler, 8 parts of sodium gluconate, 1 part of tris (2, 4-di-tert-butyl phenyl) phosphite into the mixer, stir uniformly at 900 r / min, get the premix;

[0039] Step two, put the premix into the screw extruder, the process temperature is respectively 275℃ for feeding zone, 285℃ for melting zone, 285℃ for metering zone, 290℃ for spinning assembly, after all the region temperature reaches the set value and stabilizes for 30 min, continuously pass in nitrogen at 0.5L / min;

[0040] Step three, start the screw rotation, the speed is 15rpm, the melt is transported forward, after the melt flows out stably, the spinning is sprayed out through the spinneret, cooled and solidified by side blowing, the side blowing condition is set as: temperature 19℃, wind speed 0.8m / s, after balancing, through stretching, crimping, relaxation heat setting, the winding speed is 1137m / min, the stretching multiple is 5, the relaxation heat setting temperature is 60℃, get the functionalized polyester fiber.

[0041] The preparation method of the skin-friendly modified polyester fiber chips comprises the following steps:

[0042] A1, uniformly wind 5.18g of polyester fiber on an aluminum alloy frame, place it in the reaction chamber of the vacuum plasma treatment instrument, control the gas pressure to be 300Pa, the dielectric barrier discharge power is 5.7W, and the polyester fiber is treated by plasma for 3min to obtain hydroxylated polyester fiber;

[0043] A2, take 2.41g of hydroxylated polyester fiber and add it into toluene, ultrasonic dispersion, then add 5.37g of epoxy silicone oil and 0.13g of benzyl dimethylamine, stir uniformly, then increase the temperature to 90℃, react for 6h, filter and dry at 40℃ for 12h, get the functionalized polyester fiber, then slice treatment, get the skin-friendly modified polyester fiber chips.

[0044] The preparation method of the alumina grafted antibacterial agent filler comprises the following steps:

[0045] B1, take 1.24g of nano alumina and add it into 100ml of N,N-dimethylformamide, ultrasonic dispersion for 40min, get the dispersion liquid, then take 2.28g of 1, 6-hexane diisocyanate and add it into the dispersion liquid, stir uniformly, add 0.11g of dibutyl tin dilaurate, heat to 60℃, and continuously stir for 9h, filter and dry at 40℃ for 12h, get the modified alumina;

[0046] B2, take 1.12 g modified alumina into 100 ml ion-free water, pass nitrogen, heat to 80℃, ultrasonic dispersion at the temperature for 45 min, filter, dry at 60℃ for 12 h to obtain amino-modified alumina;

[0047] B3, take 1.07 g amino-modified alumina into 100 ml N,N-dimethylformamide, ultrasonic dispersion for 40 min to obtain a dispersion, then take 3.71 g dicyandiamide into the dispersion, stir and heat to 110℃, continue stirring for 6 h, filter, wash with ion-free water for 5 times, dry at 40℃ for 12 h to obtain alumina grafted antibacterial agent filler.

[0048] Example 1

[0049] A method for preparing a skin-friendly and breathable cotton fabric, comprising the following steps:

[0050] Firstly, functionalized polyester fibers and cotton fibers are mixed in a mass ratio of 3:7 and spun into yarn by a spinning machine to obtain blended yarn;

[0051] Secondly, cotton yarn is used as warp yarn and blended yarn is used as weft yarn, the warp yarn density is controlled to be 430 yarns per 10 cm, the weft yarn density is controlled to be 200 yarns per 10 cm, and a loom is used to interweave into a grid shape to form a gray fabric;

[0052] Thirdly, the gray fabric is first immersed in clean water and then subjected to setting and drying treatment to obtain a cotton fabric.

[0053] The preparation method of the functionalized polyester fibers is shown in the preparation example, and the following are the same.

[0054] Example 2

[0055] A method for preparing a skin-friendly and breathable cotton fabric, comprising the following steps:

[0056] Firstly, functionalized polyester fibers and cotton fibers are mixed in a mass ratio of 3.5:6.5 and spun into yarn by a spinning machine to obtain blended yarn;

[0057] Secondly, cotton yarn is used as warp yarn and blended yarn is used as weft yarn, the warp yarn density is controlled to be 430 yarns per 10 cm, the weft yarn density is controlled to be 200 yarns per 10 cm, and a loom is used to interweave into a grid shape to form a gray fabric;

[0058] Thirdly, the gray fabric is first immersed in clean water and then subjected to setting and drying treatment to obtain a cotton fabric.

[0059] Example 3

[0060] A method for preparing a skin-friendly and breathable cotton fabric, comprising the following steps:

[0061] The first step, functionalized polyester fibers and cotton fibers are mixed by a mass ratio of 4:6 through a spinning machine to spin yarn, and a blended yarn is obtained;

[0062] The second step, cotton yarn is used as warp yarn, and blended yarn is used as weft yarn, the warp yarn density is controlled to be 430 per 10 centimeters, the weft yarn density is controlled to be 200 per 10 centimeters, and a loom is used to interweave into a grid shape to form a gray cloth;

[0063] The third step, the gray cloth is first immersed in clean water, and then is subjected to a setting drying treatment to obtain a cotton fabric.

[0064] Comparative Example 1

[0065] A preparation method of a skin-friendly and breathable cotton fabric comprises the following steps:

[0066] The first step, functionalized polyester fibers and cotton fibers are mixed by a mass ratio of 3.5:6.5 through a spinning machine to spin yarn, and a blended yarn is obtained;

[0067] The second step, cotton yarn is used as warp yarn, and blended yarn is used as weft yarn, the warp yarn density is controlled to be 430 per 10 centimeters, the weft yarn density is controlled to be 200 per 10 centimeters, and a loom is used to interweave into a grid shape to form a gray cloth;

[0068] The third step, the gray cloth is first immersed in clean water, and then is subjected to a setting drying treatment to obtain a cotton fabric.

[0069] The preparation method of the functionalized fiber is different from that of the preparation example in that no aluminum oxide grafting antibacterial agent filler is added, and the rest is the same.

[0070] Comparative Example 2

[0071] A preparation method of a skin-friendly and breathable cotton fabric comprises the following steps:

[0072] The first step, functionalized polyester fibers and cotton fibers are mixed by a mass ratio of 3.5:6.5 through a spinning machine to spin yarn, and a blended yarn is obtained;

[0073] The second step, cotton yarn is used as warp yarn, and blended yarn is used as weft yarn, the warp yarn density is controlled to be 430 per 10 centimeters, the weft yarn density is controlled to be 200 per 10 centimeters, and a loom is used to interweave into a grid shape to form a gray cloth;

[0074] The third step, the gray cloth is first immersed in clean water, and then is subjected to a setting drying treatment to obtain a cotton fabric.

[0075] The preparation method of the functionalized fiber is different from that of the preparation example in that a commercially available polyester fiber chip is used instead of a skin-friendly modified polyester fiber chip, and the rest is the same.

[0076] Comparative Example 3

[0077] A method for preparing a skin-friendly and breathable cotton fabric, comprising the following steps:

[0078] In the first step, functional fibers and cotton fibers are mixed in a mass ratio of 3.5:6.5 and spun into yarn by a spinning machine to obtain blended yarn;

[0079] In the second step, cotton yarn is used as warp yarn and blended yarn is used as weft yarn, the warp yarn density is controlled to be 430 yarns per 10 cm, the weft yarn density is controlled to be 200 yarns per 10 cm, and a loom is used to interweave into a grid shape to form a gray fabric;

[0080] In the third step, the gray fabric is first immersed in clean water and then subjected to setting and drying treatment to obtain a cotton fabric.

[0081] The difference between the method for preparing the functional fibers and the preparation example is that the alumina grafted antibacterial agent filler is replaced by nano-alumina, and the rest is the same.

[0082] Comparative Example 4

[0083] A method for preparing a skin-friendly and breathable cotton fabric, comprising the following steps:

[0084] In the first step, functional fibers and cotton fibers are mixed in a mass ratio of 3.5:6.5 and spun into yarn by a spinning machine to obtain blended yarn;

[0085] In the second step, cotton yarn is used as warp yarn and blended yarn is used as weft yarn, the warp yarn density is controlled to be 430 yarns per 10 cm, the weft yarn density is controlled to be 200 yarns per 10 cm, and a loom is used to interweave into a grid shape to form a gray fabric;

[0086] In the third step, the gray fabric is first immersed in clean water and then subjected to setting and drying treatment to obtain a cotton fabric.

[0087] The difference between the method for preparing the functional fibers and the preparation example is that the alumina grafted antibacterial agent filler is replaced by nano-alumina, and the rest is the same.

[0088] Performance detection

[0089] Antibacterial property test:

[0090] The fabric is cut into a 10cmx10cm sample, the test bacteria is Staphylococcus aureus, the antibacterial property of the sample is tested according to the national standard GB / T20944.2-2007 "Evaluation of Antibacterial Property of Textiles Part 2: Absorption Method", and then the antibacterial property is tested again after 50 times of washing in a C-type standard washing machine using a washing program numbered 4N according to the national standard GB / T8629-2017 "Household Washing and Drying Procedure for Textile Testing";

[0091] Skin-friendly test:

[0092] The 12 volunteers were aged 20-30 years old, half male and half female, with healthy skin and no history of allergies. One male and one female formed a group, and the fabric sample was made into an arm covering. The volunteers ran for 30 minutes at a temperature of 30°C and a humidity of 60%. After the exercise, the volunteers immediately rated their own feelings, and the average score of each group was taken as the evaluation result.

[0093]

[0094]

[0095] Tear strength test:

[0096] According to ASTM D1424-1996 "Impact Pendulum Method for Determining the Tear Strength of Fabrics", the YG065H electronic fabric strength tester was used for testing, and the sample size was 220mm x 50mm.

[0097] Air permeability test:

[0098] The fabric was cut into a sample with an area of 20cm 2 , and the air permeability was tested according to GB / T5453-1997 "Determination of Air Permeability of Textile Fabrics".

[0099] The test results are shown in the table below:

[0100]

[0101]

[0102] According to the antibacterial rate data, it can be seen that the addition of aluminum oxide grafted antibacterial agent filler greatly improves the antibacterial performance of the fabric, and the antibacterial rate before and after washing decreases very little. This is because the biguanide antibacterial agent has the advantages of broad-spectrum antibacterial property, good washing resistance, and long-lasting antibacterial effect. Grafted on nano-aluminum oxide, it can improve the dispersibility of aluminum oxide, reduce the polarity of the surface of aluminum oxide, and make the aluminum oxide grafted antibacterial agent filler better dispersed in the interior of the polyester fiber, improving the antibacterial efficiency.

[0103] According to the skin-friendly score, the polyester fiber in the examples and comparative example 1 has obvious improvement in skin-friendly feeling after being modified and added to the fabric. This is because the surface of the polyester fiber is grafted with a silicon oil molecular chain, which can reduce the friction coefficient between fibers, giving the fabric a soft, smooth, and full feel, reducing static electricity accumulation. At the same time, bacteria can breed after exercise, and the antibacterial agent can sterilize in time, without causing discomfort to the participants, indirectly improving the skin-friendly comfort.

[0104] According to the tear strength data and see, nano alumina has good reinforcing effect, can effectively enhance the polyester fiber, and improve the strength of the fabric.

[0105] According to the air permeability, the grid fabric has better air permeability, because the cavity structure of cotton fiber has good air permeability, and the grid fabric is woven after adding the functional polyester fiber, and the air permeability is not affected.

[0106] The above is only an example and description of the concept of the application, and those skilled in the art can make various modifications or supplements to the described specific embodiments or use similar ways to replace, as long as the concept of the application is not deviated or beyond the scope defined by the present application, which shall belong to the protection scope of the application.

Claims

1. A method for preparing a skin-friendly, breathable cotton fabric, characterized in that, The cotton fabric is formed by weaving warp yarns and weft yarns; the warp yarns are cotton yarns; the weft yarns are blended yarns of functionalized polyester fibers and cotton fibers; the mass ratio of the functionalized polyester fibers and the cotton fibers is 3-4:6-7; The functionalized polyester fibers are made of the following raw materials in the amount of parts by weight: 50-70 parts of skin-friendly modified polyester fiber chips, 2-4 parts of alumina grafted antibacterial agent filler, 8-10 parts of plasticizer, and 1-3 parts of antioxidant; The preparation method comprises the following steps: Step 1: mixing the functionalized polyester fibers and the cotton fibers and spinning the mixture through a spinning machine to obtain blended yarns; Step 2: using cotton yarns as warp yarns and the blended yarns as weft yarns, interlacing the yarns through a loom to form a grid-shaped gray fabric; Step 3: immersing the gray fabric in clean water, then performing a setting and drying treatment to obtain the cotton fabric.

2. The method for preparing a skin-friendly and breathable cotton fabric according to claim 1, characterized in that, The plasticizer is sodium gluconate or triethyl citrate, and the antioxidant is tris(2,4-di-tert-butylphenyl) phosphite or 2,6-di-tert-butyl-p-cresol.

3. The method for preparing a skin-friendly and breathable cotton fabric according to claim 1, characterized in that, In the second step, the density of the warp yarns is 430 per 10 cm, and the density of the weft yarns is 200 per 10 cm.

4. The method for preparing a skin-friendly and breathable cotton fabric according to claim 1, characterized in that, The preparation method of the functionalized polyester fibers comprises the following steps: Step 1: adding skin-friendly modified polyester fiber chips, alumina grafted antibacterial agent filler, plasticizer, and antioxidant into a mixer, stirring uniformly at a speed of 900-1100 r / min to obtain a premix; Step 2: placing the premix in a screw extruder, and setting the process temperatures of the feeding zone, the melting zone, the metering zone, and the spinning assembly to be 275-280℃, 285-290℃, 285-290℃, and 285-290℃ respectively, continuously supplying nitrogen at a rate of 0.5-0.6 L / min after the temperatures of all the zones reach the set values and stabilize for 20-30 min; Step 3: starting the rotation of the screw at a speed of 10-20 rpm, conveying the melt forward, and spinning the fibers through the spinneret after the melt flow stabilizes, and the fibers are cooled and solidified by side blowing, and the side blowing conditions are set to be a temperature of 18-20℃ and a wind speed of 0.7-0.9 m / s, and the fibers are balanced, stretched, crimped, and relaxed and heat set, and the winding speed is 1100-1150 m / min, the stretching multiple is 5-6, and the relaxation and heat setting temperature is 55-65℃, to obtain the functionalized polyester fibers.

5. The method for preparing a skin-friendly and breathable cotton fabric according to claim 1, characterized in that, The preparation method of the skin-friendly modified polyester fiber chips comprises the following steps: A1: uniformly winding the polyester fibers on an aluminum alloy frame, placing the frame in the reaction chamber of a sub-vacuum plasma treatment instrument, controlling the air pressure to be 200-300 Pa, and performing dielectric barrier discharge at a power of 5-6 W on the polyester fibers for 1-3 min to obtain hydroxylated polyester fibers; A2: adding the hydroxylated polyester fibers into toluene, uniformly dispersing by ultrasonic, then adding epoxy silicone oil and a catalyst a, stirring uniformly, increasing the temperature to 80-100℃, reacting for 5-7 h, filtering, and drying at 40-50℃ for 11-13 h to obtain functionalized polyester fibers, and then performing a slicing treatment to obtain the skin-friendly modified polyester fiber chips.

6. The method for preparing a skin-friendly and breathable cotton fabric according to claim 5, characterized in that, In A2, the catalyst a is benzyl dimethyl amine or triethylamine.

7. The method for preparing a skin-friendly and breathable cotton fabric according to claim 1, characterized in that, The preparation method of the alumina grafted antibacterial agent filler specifically comprises the following steps: B1, take nano alumina into N, N-dimethylformamide, ultrasonic dispersion for 30-40 min, to obtain a dispersion liquid, then take 1, 6-hexane diisocyanate into the dispersion liquid, stir uniformly, add catalyst b, heat to 60-80℃, and continue to stir for 8-10h, to obtain modified alumina; B2, take the modified alumina into ion-free water, pass nitrogen, heat to 60-80℃, ultrasonic dispersion for 40-50 min at the temperature, filter, dry at 50-60℃ for 11-13h, to obtain amino modified alumina; B3, take the amino modified alumina into N, N-dimethylformamide, ultrasonic dispersion for 30-40 min, to obtain a dispersion liquid, then take dicyandiamide into the dispersion liquid, stir and heat to 100-120℃, continue to stir for 4-6h, filter, wash with ion-free water for 3-5 times, dry at 40-50℃ for 10-12h, to obtain alumina grafted antibacterial agent filler.

8. The method for preparing a skin-friendly and breathable cotton fabric according to claim 7, characterized in that, In B1, the catalyst b is dibutyl tin dilaurate or stannous octoate.

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