All-cotton multi-heating yarn, preparation method and product thereof

Abstract

The present application relates to the field of spinning technology, and particularly relates to a full cotton multi-heating yarn, a preparation method and a product thereof. The preparation method is to process cotton / micro-nano heating fiber sliver through a carding compact spinning process, including a carding / electrospinning process, a doubling process, a roving process, a spinning process and a bobbin process. The full cotton multi-heating yarn obtained by the above preparation method, in the cotton / micro-nano heating fiber sliver, the cotton fiber content is greater than or equal to 99.5%, and the micro-nano ceramic heating fiber content is less than or equal to 0.5%. The present application makes the micro-nano heating fiber with a content less than or equal to 0.5% and the cotton fiber inlay composite through a carding / electrospinning all-in-one machine, and then the yarn is formed through a carding compact spinning process, so that the full cotton multi-heating yarn has the advantages of uniform yarn evenness, compact structure, high strength, less hair, good quality and high production efficiency without increasing the cotton waste rate.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of spinning technology, in particular to a full cotton multi-heating yarn, a preparation method thereof and a product. BACKGROUND

[0002] Cold protection is an important indicator of winter clothing comfort. Traditional cotton warm-keeping fabrics mainly control energy loss to achieve warm-keeping effect by increasing the storage of still air. Although the fabric has the characteristics of skin comfort, the full cotton product does not have the function of self-heating. In order to enhance the warm-keeping effect of the fabric as a whole, it is bulky and heavy, which is not convenient for sports and lacks beauty. Moreover, after multiple washes, it deforms seriously and cannot meet the requirements of today's consumers for warm-keeping clothing. The carded yarn is not combed in the carding process, so the fiber in the yarn has poor regularity and high short fiber content, resulting in poor yarn evenness, high CV%, high neps and thick places, low yarn strength, long hair and other problems, which has been the main technical bottleneck restricting the application of carded yarn in high-end textiles. At present, some scholars have explored carded compact spinning yarn. The research of "Performance Analysis of Compact Spun Carded Yarn and Traditional Ring Spun Combed Yarn" shows that the CJ14.5tex compact spun carded yarn has worse yarn formation, thick places and neps than the CJ14.5tex traditional ring spun yarn, but has better strength and elongation performance, and fewer hairs. It is believed that in production, measures such as increasing the carding cotton shedding rate can be taken to improve the thick places and neps of compact spun carded yarn. This study compares carded compact spun yarn with combed yarn. Since the combed yarn is produced by the combing process, the short fiber content in the yarn is significantly reduced and the fiber regularity is good. At the same time, due to the use of the combing process for secondary carding of cotton fibers, a large amount of cotton shedding occurs during the carding process, resulting in a significant increase in spinning cost.

[0003] In recent years, the production technology of heat-retaining and warm-keeping fibers has been continuously broken through, and heat-retaining and warm-keeping fibers such as heat-releasing acrylic fiber, bulk acrylic fiber, far-infrared series, hollow series, graphene series, bamboo charcoal series and phase change temperature adjustment have appeared, providing a solid foundation for the development of heat-retaining and warm-keeping functional fabrics. For example, CN201810470612.5, a light-absorbing heat-releasing fiber, uniformly mixes inorganic heat-releasing particles and polyester chips or nylon chips, and then feeds the mixed particles into a double-screw mixing machine and a slicing machine to slice and granulate, and then feeds the modified polyester chips or modified nylon chips into a spinning box with a temperature of 260-300℃ for melt spinning to obtain the light-absorbing heat-releasing fiber. CN201810955138.5, a preparation method and application of self-heating cellulose fiber, dissolves 0.5%-3% of capsaicin in 4%-7% of sodium hydroxide and 6%-12% of urea solution to form a mixed solution, and the capsaicin-containing cellulose spinning solution is prepared into capsaicin-loaded cellulose fiber by a wet spinning process; CN202110728889.5, a preparation method of phase change temperature adjustment heat-releasing fiber, adds functional microcapsules to polyacrylonitrile to prepare phase change temperature adjustment heat-releasing fiber. The heat-retaining and warm-keeping fibers all use chemical fibers as carriers (main materials), and realize the heat-releasing function of the fibers by adding functional powders, additives and microcapsules in the melt or solution spinning process of the carrier materials.

[0004] In summary, the full-cotton warm-keeping products on the market are bulky and heavy, and do not have the function of self-heating. Although the addition of functional materials to chemical fiber products has certain functions of self-heating and heat storage, it is limited by the high thermal conductivity coefficient of chemical fibers (cotton is 0.071-0.073, viscose fiber is 0.055-0.071, polyester is 0.084, and nylon is 0.244-0.337), the heat is lost quickly, and static electricity is easily generated, which seriously affects the wearing experience of consumers. SUMMARY

[0005] In view of the problems of the existing warm-keeping products that cannot self-heat or lose heat quickly and are easy to generate static electricity, the present application provides a full-cotton multi-heating yarn and a preparation method and product thereof. The content of the micro-nano heat-releasing fiber is ≤0.5%, which is inlaid and compounded with cotton fiber by a cotton / electrospinning integrated machine, and then spun into yarn by a carding compact spinning process. The full-cotton multi-heating yarn has uniform yarn evenness, compact structure, high strength, less hairiness, good quality and high production efficiency without increasing the cotton loss.

[0006] In the first aspect, the present application provides a preparation method of a full-cotton multi-heating yarn, which processes cotton / micro-nano heat-releasing fiber sliver by a carding compact spinning process, including the following steps:

[0007] The carding / electrospinning process: the lap cotton weight is 440-520 g / m, the carding / electrospinning integrated machine carding weight is 18.00-20.50 g / 5 m, the carding speed is 35-40 m / min, the carding cylinder speed is 415 r / min, the licker-in speed is 890 r / min, the tin-licker ratio is 2.4:1, the flat speed is 39.4 cm / min, the carding dust removal knife angle is 90°, the front upper cover plate outlet gauge is 3 mm, the front cotton web cleaner gauge is 0.3 mm, the carded sliver cotton neps content is ≤45 pieces / g, the 12.7 mm short fiber content is ≤6.5%, and the carding overall cotton waste rate is ≤10.5%; the electrospinning voltage is 48.5-49.8 kV, and the spinning solution consumption is 220-240 mL / h;

[0008] The drawing process: a three-way drawing method is adopted to improve the fiber straightness parallelism of the carded sliver, reduce the weight unevenness of the drawn sliver, the first drawing weight is 18.60-20.75 g / 5 m, the back zone draft ratio is 1.66-1.77 times; the second drawing weight is 18.40-20.55 g / 5 m, the back zone draft ratio is 1.36-1.45 times; the last drawing weight is 18.20-20.50 g / 5 m, and the back zone draft ratio is 1.25-1.36 times; the weight unevenness of the last drawing is ≤0.35%;

[0009] The roving process: a large twist factor is adopted to improve the fiber cohesion, the roving twist factor is 130-135, and the roving weight is 5.5-7.5 g / 10 m;

[0010] The spinning process: a negative pressure type compact spinning device is adopted for production, the main pipe negative pressure value is 3200-3800 MPa, in order to improve the yarn evenness, a front pressure bar + a rear pressure bar nip is used, and the front pressure bar nip gauge is 3.0-2.25 mm;

[0011] The winding process.

[0012] Further, the cotton / micro-nano heating fiber sliver is made of fine lint cotton or / and long lint cotton.

[0013] Further, the spinning solution formula and preparation steps of the micro-nano heating fiber are the prerequisite for realizing the production of the heating functional nanofiber, the spinning solution of the micro-nano heating fiber in the cotton / micro-nano heating fiber sliver is an organic solution containing nano heating powder and a polymer, wherein the polymer concentration is 10wt%-15wt%, and the nano heating powder concentration is 6wt%-10wt%; the preparation method is as follows:

[0014] The nano heating powder is added to the organic solvent, ultrasonic oscillation and stirring are performed, then the polymer is added and ultrasonic oscillation and stirring are continued until the polymer is completely dissolved, so that the nano heating powder presents a uniformly dispersed suspension state in the spinning solution.

[0015] Further, the organic solvent is one or more of dimethylformamide, dimethylacetamide, dichloromethane, dimethyl sulfoxide; and the polymer is one or more of polyacrylonitrile (PAN), thermoplastic polyurethane (TPU), and polylactic acid (PLA).

[0016] In a second aspect, the application provides a full-cotton multi-heating yarn prepared by the above method, wherein the content of cotton fibers in the cotton / micro-nano heating fiber sliver is ≥ 99.5%, and the content of micro-nano ceramic heating fibers is ≤ 0.5%. According to the industry standard FZ / T01053-2007 "Textiles - Identification of Fiber Content", when the content of a certain fiber in the product is ≤ 0.5%, it can be excluded from the total amount (labeled as containing a small amount of the fiber). Therefore, the yarn obtained by compounding the micro-nano heating fiber with a content of ≤ 0.5% and cotton fibers can still be called full-cotton yarn or pure cotton yarn.

[0017] Further, the full-cotton multi-heating yarn has the functions of far-infrared heating, light-absorbing heating, and moisture-absorbing heating, and has the characteristics of uniform strip evenness, compact structure, high strength, and less hair. For yarns of 10-50 English, the yarn strip evenness CV% of the product is 8.8%-12.9% without increasing the drop rate (8%-10.5%), which is 7%-25% lower than that of the same specification carding product; the yarn + 50% thick places are between 1 and 58 grains, which is 26.5%-75% lower than that of the same specification carding product; the yarn + 200% neps are between 2 and 76 grains, which is 17.4%-60% lower than that of the same specification carding product; the yarn strength is between 275 and 1106 CN, which is 8%-11.5% higher than that of the same specification carding product; the yarn 1mm hair is between 574 and 640 hairs per 10m, which is 10.8%-20% lower than that of the same specification carding product, and the yarn 3mm hair is between 22 and 35 hairs per 10m, which is 45.6%-59% lower than that of the same specification carding product.

[0018] In a third aspect, the application also provides a fabric prepared from the above full-cotton multi-heating yarn, wherein the fabric has a far-infrared radiation temperature rise value ≥ 4.3℃, a far-infrared emissivity ≥ 0.93, a light heat storage performance maximum temperature rise value ≥ 9.0℃, an average temperature rise value ≥ 5.6℃, a moisture-absorbing heating maximum temperature rise value ≥ 7.5℃, and an average temperature rise value within 30min ≥ 4.2℃.

[0019] The application has the following advantages:

[0020] The preparation method of the full-cotton multi-heating yarn provided by the application can ensure that the full-cotton multi-heating yarn can meet functional requirements and achieve ideal spinning indexes and production efficiency by optimizing the parameter range. The full-cotton multi-heating yarn prepared by the application maintains the natural comfortable and soft skin-friendly properties of full-cotton products, and at the same time, endows the products with the multi-heating functions of moisture absorption and heating, far-infrared heating and light absorption and heating, and the functional durability is long, which fills the market gap of the current full-cotton heating functional products and has high economic value. DETAILED DESCRIPTION

[0021] In order for those skilled in the art to better understand the technical solutions in the application, the technical solutions in the embodiments of the application will be clearly and completely described below. Obviously, the described embodiments are only some of the embodiments of the application, rather than all the embodiments. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor should fall within the protection scope of the application.

[0022] The nano-ceramic heating powder used in the following embodiments is purchased from Suzhou Zhongxu Nanometer New Material Technology Co., Ltd.

[0023] Embodiment 1

[0024] A 32 English full-cotton multi-heating warm-keeping open gilling compact spinning yarn, the raw material of which includes 100% Xinjiang machine-picked fine lint cotton and spinning liquid, is obtained by the following steps: the cotton / micro-nano heating fiber sliver is obtained through a cotton carding / electrospinning integrated machine, and then is processed through an open gilling compact spinning process. The specific preparation steps are as follows:

[0025] Cleaning process: the cleaning weight of the Xinjiang machine-picked fine lint cotton is 470 / m.

[0026] Cotton carding / electrospinning process: the cotton carding quantity of the cotton carding / electrospinning integrated machine is 18.00 g / 5 m, the cotton carding speed is 40 m / min, the cylinder speed of the cotton carding machine is 415 r / min, the pin roller speed is 890 r / min, the tin pin ratio is 2.4:1, the flat speed is 39.4 cm / min, the dust removal knife angle of the cotton carding machine is 90°, the outlet gauge of the front upper cover plate is 3 mm, the gauge of the front cotton net cleaner is 0.3 mm, the neps content in the cotton carding sliver is ≤35 pieces / g, the 12.7 mm short fiber rate is ≤6.3%, the cotton carding waste rate is 10%, the electrospinning voltage is 49.2 kV, the spinning liquid consumption is 230 mL / h, and the sub-micro-nano heating fiber content in the yarn is ≤0.36%;

[0027] The spinning solution preparation method is: adding nano ceramic heating powder with a particle size of 50 nm into dimethyl formamide, ultrasonic oscillation and stirring for 10 min, then adding PAN polymer, continuing ultrasonic oscillation and stirring until the polymer is completely dissolved for 24 h, obtaining a spinning solution with a nano heating powder concentration of 8 wt%, a PAN polymer concentration of 10 wt%, and the nano ceramic heating powder in the spinning solution being in a uniformly dispersed suspension state.

[0028] Drawing process: three-drawing method is adopted to improve the fiber straightness and parallelism of the carded sliver and reduce the weight unevenness of the drawing sliver; the first-drawing weight is 18.60 g / 5 m, and the back zone draft ratio is 1.66 times; the second-drawing weight is 18.40 g / 5 m, and the back zone draft ratio is 1.36 times; the third-drawing weight is 18.20 g / 5 m, and the back zone draft ratio is 1.25 times; the weight unevenness of the final-drawing sliver is ≤0.35%.

[0029] Roving process: large twist factor is adopted to improve the fiber cohesion, and the roving twist factor is 132, and the roving weight is 6.0 g / 10 m.

[0030] Spinning process: negative pressure compact spinning device is adopted for production, the main pipe negative pressure value is 3500 MPa, and front pressure bar + back pressure bar nip is used to improve the yarn evenness, and the front pressure bar nip distance is 2.75 mm.

[0031] Winding process: Uster electronic clearer is used, the winding speed is 1300 m / min, and the clearer parameters are N: 230%, S: 110% / 1.5 cm, L: 30% / 30 cm, T: -20% 20 cm, C±: 10% / 2.0 m, and CC±: 12% / 5.0 m.

[0032] Example 2

[0033] A 50 English cotton multi-heating warm-keeping carded compact spinning yarn, the raw material includes 100% Xinjiang machine-picked fine lint cotton and a spinning solution, and the cotton / micro-nano heating fiber sliver is obtained through a carding / electrospinning integrated machine, and then the yarn is obtained through a carded compact spinning process. The specific preparation steps are as follows:

[0034] Cleaning process: the cleaning weight of the Xinjiang machine-picked fine lint cotton is 440 / m.

[0035] Carding / electrospinning process: the carding / electrospinning integrated machine has a carding weight of 18.00 g / 5 m, a carding speed of 35 m / min, a carding cylinder speed of 415 r / min, a licker-in speed of 890 r / min, a tin-licker ratio of 2.4:1, a flat speed of 39.4 cm / min, a carding dust removal knife angle of 90°, a front upper cover plate outlet gauge of 3 mm, a front cotton web cleaner gauge of 0.3 mm, a carded sliver cotton nub content of ≤35 pieces / g, a 12.7 mm short fiber content of ≤6.3%, a carded sliver cotton falling rate of 10.5%, an electrospinning voltage of 48.5 kV, a spinning solution consumption of 220 mL / h, and a yarn sub-micro-nano heating fiber content of ≤0.32%;

[0036] The spinning solution preparation method is as follows: the nano ceramic heating powder with a particle size of 50 nm is added into dimethylacetamide, ultrasonic oscillation and stirring are performed for 10 min, TPU polymer is further added, ultrasonic oscillation and stirring are continued until the TPU polymer is completely dissolved for 24 h, a spinning solution with a nano heating powder concentration of 6 wt% and a TPU polymer concentration of 10 wt% is obtained, and the nano ceramic heating powder is in a uniformly dispersed suspension state in the spinning solution.

[0037] Drawing process: three-drawing is adopted to improve the fiber straightness and parallelism of the carded sliver and reduce the weight unevenness of the drawn sliver; the first-drawing weight is 18.60 g / 5 m, the back zone draft ratio is 1.66 times; the second-drawing weight is 18.40 g / 5 m, the back zone draft ratio is 1.36 times; the third-drawing weight is 18.20 g / 5 m, and the back zone draft ratio is 1.25 times; the weight unevenness of the final-drawing is ≤0.35%.

[0038] Roving process: a large twist factor is adopted to improve the fiber cohesion, the roving twist factor is 135, and the roving weight is 5.5 g / 10 m.

[0039] Spinning process: a negative pressure compact spinning device is used for production, the main pipe negative pressure value is 3200 MPa, the front pressure bar nip is used to improve the yarn evenness, and the front pressure bar nip gauge is 2.25 mm.

[0040] Winding process: an Uster electronic clearer is used, the winding speed is 1100 m / min, the clearer parameters are N: 230%, S: 110% / 1.0 cm, L: 30% / 20 cm, T: -20% 20 cm, C±: 10% / 2.0 m, and CC±: 12% / 5.0 m.

[0041] Example 3

[0042] A 10-spindle full-cotton multi-heating warm-keeping open gilling compact spinning yarn, raw materials including 100% Xinjiang machine-picked fine lint cotton and spinning liquid, through a cotton carding / electrospinning integrated machine to obtain cotton / micro-nano heating fiber sliver, and then through an open gilling compact spinning process to obtain the same. The specific preparation steps are as follows:

[0043] Cleaning process: the cleaning weight of the Xinjiang machine-picked fine lint cotton is 520 / m.

[0044] Cotton carding / electrospinning process: the cotton carding weight of the cotton carding / electrospinning integrated machine is 20.50 g / 5 m, the cotton carding speed is 35 m / min, the cylinder speed of the cotton carding machine is 415 r / min, the speed of the licker-in is 890 r / min, the tin-stick ratio is 2.4:1, the flat speed is 39.4 cm / min, the dust removal knife angle of the cotton carding machine is 90°, the front upper cover plate outlet gauge is 3 mm, the front cotton net cleaner gauge is 0.3 mm, the neps content in the cotton carding sliver is ≤35 / g, the 12.7 mm short fiber rate is ≤6.3%, the cotton carding waste rate is 8%, the electrospinning voltage is 48.5 kV, the spinning liquid consumption is 220 mL / h, and the micro-nano heating fiber content in the yarn is ≤0.32%;

[0045] The spinning liquid preparation method is as follows: the nano ceramic heating powder with a particle size of 50 nm is added into dichloromethane, ultrasonic oscillation and stirring are performed for 10 min, then the PLA polymer is added, and ultrasonic oscillation and stirring are continued until the polymer is completely dissolved for 24 h, to obtain a spinning liquid with a nano heating powder concentration of 10 wt% and a PLA polymer concentration of 15 wt%, and the nano ceramic heating powder is in a uniformly dispersed suspension state in the spinning liquid.

[0046] Drawing process: three-drawing mode is adopted to improve the fiber straightness parallelism of the open gilling sliver and reduce the weight unevenness of the drawing sliver; the first-drawing weight is 20.75 g / 5 m, the back zone draft ratio is 1.77 times; the second-drawing weight is 20.55 g / 5 m, the back zone draft ratio is 1.45 times; the last-drawing weight is 20.50 g / 5 m, and the back zone draft ratio is 1.36 times; the last-drawing weight unevenness is ≤0.35%.

[0047] Roving process: a large twist factor is adopted to improve the fiber cohesion, the roving twist factor is 130, and the roving weight is 7.5 g / 10 m.

[0048] Spinning process: a negative pressure type compact spinning device is used for production, the main pipeline negative pressure value is 3800 MPa, the front pressure bar nip is used to improve the yarn strip evenness, and the front pressure bar nip gauge is 3.0 mm.

[0049] Winding process: Uster electronic yarn clearer, winding speed is 1500 m / min, clearer parameters are N: 230%, S: 110% / 1.1 cm, L: 40% / 30 cm, T: -30% 30 cm, C±: 10% / 2.0 m; CC±: 12% / 5.0 m.

[0050] Comparative Example 1

[0051] A 32 count all-cotton carded yarn, the raw material includes 100% Xinjiang machine-picked fine lint cotton, and the preparation method is as follows:

[0052] Cleaning process: the cleaning weight of Xinjiang machine-picked fine lint cotton is 580 / m.

[0053] Carding process: the carding weight is 20.50 g / 5 m, the carding speed is 65 m / min, the cylinder speed of the carding machine is 415 r / min, the pin speed is 1040 r / min, the cylinder-pin ratio is 2.1:1, the flat speed is 36.36 cm / min, the dust removal knife angle of the carding machine is 120°, the outlet gauge of the front upper flat is 2 mm, the gauge of the front cotton net cleaner is 0.9 mm, the neps content in the carded sliver is 89 / g, the 12.7 mm short fiber rate is less than or equal to 7.5%, and the carding waste rate is 12.5%.

[0054] Drawing process: two drawing, the first drawing weight is 21.5 g / 5 m, the back zone draft ratio is 1.88 times; the second drawing weight is 21.0 g / 5 m, the back zone draft ratio is 1.45 times; the weight unevenness of the final drawing is 0.53%.

[0055] Roving process: the roving twist factor is 118, and the roving weight is 5.0 g / 10 m.

[0056] Spinning process: ordinary ring spinning production, 3.0 mm front pressure bar + back pressure bar nip.

[0057] Winding process: Uster electronic yarn clearer, winding speed is 1600 m / min, clearer parameters are N: 250%, S: 120% / 1.2 cm, L: 40% / 40 cm, T: -40% 30 cm, C±: 10% / 2.0 m; CC±: 12% / 5.0 m.

[0058] Comparative Example 2

[0059] A 50 count all-cotton carded yarn, the raw material includes 100% Xinjiang machine-picked fine lint cotton, and the preparation method is as follows:

[0060] Cleaning process: the cleaning weight of Xinjiang machine-picked fine lint cotton is 470 / m.

[0061] Carding process: the carding weight is 19.50 g / 5 m, the carding speed is 60 m / min, the carding cylinder speed is 415 r / min, the licker-in speed is 1040 r / min, the tin-licker ratio is 2.1:1, the flat speed is 36.36 cm / min, the carding dust knife angle is 125°, the front apron outlet gauge is 2 mm, the front web clearer gauge is 0.7 m, the carded sliver neps content is 85 / g, the 12.7 mm short fiber rate is less than or equal to 7.2, and the carding waste rate is 14.5%.

[0062] Drawing process: two drawing, the first drawing weight is 20.00 g / 5 m, the back zone draft ratio is 1.77 times; the second drawing weight is 19.20 g / 5 m, the back zone draft ratio is 1.45 times; the drawing weight unevenness is 0.62%.

[0063] Roving process: the roving twist factor is 120, and the roving weight is 4.83 g / 10 m.

[0064] Spinning process: ordinary ring spinning production, 2.25 mm front pressure bar + back pressure bar nip.

[0065] Winding process: Uster electronic clearer, the winding speed is 1200 m / min, the clearer parameters are N: 250%, S: 150% / 1.5 cm, L: 40% / 40 cm, T: -40% 40 cm, C±: 12% / 2.0 m; CC±: 15% / 5.0 m.

[0066] Comparative Example 3

[0067] A 10 count all-cotton carded yarn, the raw material includes 100% Xinjiang machine-picked fine cotton, and the preparation method is as follows:

[0068] Cleaning process: the Xinjiang machine-picked fine cotton cleaning weight is 550 / m.

[0069] Carding process: the carding weight is 23.50 g / 5 m, the carding speed is 70 m / min, the carding cylinder speed is 415 r / min, the licker-in speed is 1040 r / min, the tin-licker ratio is 2.1:1, the flat speed is 36.36 cm / min, the carding dust knife angle is 120°, the front apron outlet gauge is 2 mm, the front web clearer gauge is 0.9 mm, the carded sliver neps content is 115 / g, the 12.7 mm short fiber rate is less than or equal to 8.5, and the carding waste rate is 15.5%.

[0070] Drawing process: two drawing, the first drawing weight is 22.50 g / 5 m, the back zone draft ratio is 1.88 times; the second drawing weight is 19.20 g / 5 m, the back zone draft ratio is 1.45 times; the drawing weight unevenness is 0.58%.

[0071] Roving process: The roving twist coefficient is 105, and the roving weight is 8.5g / 10m.

[0072] Fine spinning process: ordinary ring spinning production, 4.0mm ordinary nip + back pressure bar.

[0073] Winding process: Uster capacitive electronic yarn clearer, winding speed is 1400m / min, clearer parameters are N: 280%, S: 180% / 1.8cm, L: 50% / 40cm, T: -50%40cm, C±: 15% / 2.0m; CC±: 20% / 5.0m.

[0074] Comparative Example 4

[0075] A 32-count all-cotton multi-heat-generating combed compact spun yarn is prepared in a manner basically the same as in Example 1, except that the preparation method of the spinning solution is different.

[0076] The preparation method of the spinning solution for Comparative Example 4 is as follows:

[0077] Nano-ceramic heating powder with a particle size of 50 nm was added to dimethylformamide, and then PAN polymer was added to obtain a spinning solution with a nano-heating powder concentration of 8 wt% and a PAN polymer concentration of 10 wt%. The spinning solution was stirred with a magnetic stirrer for 24 h until the PAN was completely dissolved.

[0078] Comparative Example 5

[0079] A 32-count all-cotton multi-heat-generating and warm combed compact spun yarn is prepared in a manner basically the same as in Example 1, except that the process parameters for the opening, carding / electrostatic spinning, and drawing processes are different.

[0080] The opening, carding / electrostatic spinning, and drawing processes of Comparative Example 5 are as follows:

[0081] Cleaning process: The cleaning weight of Xinjiang machine-picked fine cotton is 530 g / m.

[0082] Carding / electrostatic spinning process: The carding quantity of the integrated carding / electrostatic spinning machine is 17.5g / 5m, the carding machine speed is 55m / min, the carding cylinder speed is 420r / min, the licker-in speed is 960r / min, the licker-in ratio is 2.3:1, the flat plate speed is 39.6cm / min, the carding machine dust removal knife angle is 105°, the front upper cover outlet spacing is 2mm, the front web cleaner spacing is 0.6mm, the cotton nip content in the carded sliver is ≤65 pieces / g, the 12.7mm short fiber rate is ≤8.1%, the carding waste rate is 13.5%, the electrostatic spinning voltage is 50.2kV, and the spinning solution consumption is 250mL / h (severe dripping occurs during electrostatic spinning).

[0083] Doubling process: two ways of doubling; the first way of doubling is 18.60 g / 5 m, and the back zone draft ratio is 1.66 times; the second way of doubling is 18.20 g / 5 m, and the back zone draft ratio is 1.36 times.

[0084] The properties of the yarns prepared in Examples 1-3 and Comparative Examples 1-5 were detected, and the results are shown in Table 1 according to GB / T 3292.1-2008 “Textiles - Yarn evenness - Part 1: Capacitance method”, GB / T 3916-2013 “Textiles - Determination of breaking force and elongation of single yarns from packages (CRE method)”, and FZ / T 01086-2020 “Textiles - Yarn hairiness - Determination of hairiness - Projection counting method”.

[0085] Table 1: Test results of evenness and strength indexes of each yarn

[0086]

[0087] The all-round multiple heat-generating warm-keeping fabrics were woven using the yarns prepared in Examples 1-3 and Comparative Examples 1-5, and the warm-keeping, heat-storing and heat-generating abilities of the fabrics were compared, and the results are shown in Table 2 according to GB / T 30127-2013 “Textiles - Detection and evaluation of far infrared performance”, GB / T 18319-2019 “Textiles - Test method for light heat storage performance”, and FZ / T 73036-2010 “Moisture-absorbing and heat-generating knitted underwear”.

[0088] Table 2: Test results of far infrared heat-generating and warm-keeping performance, light heat storage performance and moisture-absorbing and heat-generating of each yarn

[0089]

[0090] The changes of multiple heat-generating function of the all-round multiple heat-generating warm-keeping fabrics woven using the yarns of Example 1 and Comparative Example 5 before and after washing were tested, and the results are shown in Table 3.

[0091] Table 3: Changes of multiple heat-generating function of the all-round multiple heat-generating warm-keeping fabrics before and after washing

[0092]

[0093] Although the present application has been described in detail by preferred embodiments, the present application is not limited thereto. Various equivalent modifications or replacements can be made to the embodiments of the present application by those skilled in the art without departing from the spirit and essence of the present application, and these modifications or replacements shall be within the scope of the present application. Any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, and these changes or replacements shall be within the protection scope of the present application.

Claims

1. A method for preparing a full cotton multi-heating yarn, characterized by, The cotton / micro-nano heat generating fiber sliver is processed by the compact spinning process of carding and close spinning, including the following steps: The carding / electrospinning process: the lap weight of the cleaned cotton is 440-520 g / m, the carding and electrospinning integrated machine has a carding weight of 18.00-20.50 g / 5 m, the carding speed is 35-40 m / min, the carding cylinder speed is 415 r / min, the licker-in speed is 890 r / min, the tin-stick ratio is 2.4:1, the flat speed is 39.4 cm / min, the carding dust removal knife angle is 90°, the front upper cover plate outlet gauge is 3 mm, the front cotton web cleaner gauge is 0.3 mm, the neps content in the carded sliver is ≤45 pieces / g, the 12.7 mm short fiber content is ≤6.5%, and the overall carding waste rate is ≤10.5%; the electrospinning voltage is 48.5-49.8 kV, and the spinning solution consumption is 220-240 mL / h; The doubling process: a three-way doubling method is adopted, the first doubling weight is 18.60-20.75 g / 5 m, the back zone draft ratio is 1.66-1.77 times; the second doubling weight is 18.40-20.55 g / 5 m, the back zone draft ratio is 1.36-1.45 times; the last doubling weight is 18.20-20.50 g / 5 m, the back zone draft ratio is 1.25-1.36 times; the last doubling weight unevenness is ≤0.35%; The roving process: the roving twist factor is 130-135, and the roving weight is 5.5-7.5 g / 10 m; The spinning process: a negative pressure type compact spinning device is used for production, the main pipeline negative pressure value is 3200-3800 MPa, and a front pressure bar + rear pressure bar nip is used; The winding process: The yarn count of the yarn is 10-50 English, the yarn evenness CV% of the product is 8.8%-12.9%, the yarn +50% neps is between 1 and 58, the yarn +200% neps is between 2 and 76, the yarn strength is between 275 and 1106 CN, the yarn 1 mm hairiness is between 574 and 640 per 10 m, and the 3 mm hairiness is between 22 and 35 per 10 m.

2. The production method according to claim 1, wherein The cotton / micro-nano heat generating fiber sliver contains fine and long lint cotton.

3. The production method according to claim 1, wherein The spinning solution of the micro-nano heat generating fiber in the cotton / micro-nano heat generating fiber sliver is an organic solution containing nano heat generating powder and high polymer, wherein the high polymer concentration is 10wt%-15wt%, and the nano heat generating powder concentration is 6wt%-10wt%.

4. The production method according to claim 3, wherein The preparation method of the spinning solution of the micro-nano heat generating fiber is as follows: The nano heat generating powder is added to the organic solvent, ultrasonic oscillation and stirring are performed, then the high polymer is added and ultrasonic oscillation and stirring are continued until the high polymer is completely dissolved, so that the nano heat generating powder is in a uniformly dispersed suspension state in the spinning solution.

5. The production method according to claim 4, wherein The organic solvent is one or more of dimethylformamide, dimethylacetamide, dichloromethane, and dimethyl sulfoxide; the high polymer is one or more of polyacrylonitrile, thermoplastic polyurethane, and polylactic acid.

6. A fully cotton multi-heating yarn obtained by the production method according to any one of claims 1 to 5, characterized in that, In the cotton / micro-nano heat generating fiber sliver, the cotton fiber content is ≥99.5%, and the micro-nano ceramic heat generating fiber content is ≤0.5%.

7. A fabric prepared using the all-cotton multi-heating yarn according to claim 6, characterized in that, The far infrared radiation temperature rise value of the fabric is greater than or equal to 4.3 DEG C, the far infrared emissivity is greater than or equal to 0.93; the maximum light heat storage performance temperature rise value is greater than or equal to 9.0 DEG C, the average temperature rise value is greater than or equal to 5.6 DEG C; the maximum moisture absorption heat generation temperature rise value is greater than or equal to 7.5 DEG C, and the average temperature rise value within 30 min is greater than or equal to 4.2 DEG C.

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