Antibacterial far infrared thermal knitted material and antibacterial thermal fabric

Abstract

This application relates to the field of textile technology, specifically disclosing an antibacterial far-infrared warm knitted material and an antibacterial warm fabric. The antibacterial far-infrared warm knitted material is a yarn made from a blend of fibers including multifunctional polyester fibers and wool fibers. The wool fibers in this application are modified and then blended with multifunctional polyester fibers whose spinning properties are matched. The spinning and dyeing process is optimized, utilizing the hygroscopic properties of the wool fibers and the accordion pleats formed by the nanoscale microporous structure of the multifunctional polyester fibers to synergistically enhance moisture evaporation, thus improving the quick-drying and washing performance of the fabric, achieving a machine-washable and easy-care effect. Furthermore, the antibacterial far-infrared warm knitted material of this application also has a certain antibacterial effect, and this antibacterial effect has minimal attenuation after washing. Even after 50 washes, it still meets the national standard 3A level, and it does not produce cytotoxicity or harmful residues due to achieving the antibacterial effect.

Description

Technical Field

[0001] This application relates to the field of textile technology, and more specifically, to an antibacterial far-infrared thermal knitted material and an antibacterial thermal fabric. Background Technology

[0002] Knitted fabrics are fabrics made by weaving yarn into loops using knitting needles and then interlocking these loops. A wide range of raw materials can be used to make knitted fabrics, including cotton, wool, silk, linen, synthetic fibers, and their blends or interlaced yarns. Knitted fabrics are soft and have good wrinkle resistance and breathability, as well as significant stretch and elasticity, making them suitable for clothing production.

[0003] One related technology involves a knitted fabric made from a knitted material processed using a knitting technique. This knitted material is a blended yarn composed of polyester and wool fibers. Wool fibers have strong hydrophilicity, enabling the fabric to achieve excellent sweat-wicking properties.

[0004] Regarding the aforementioned technologies, the inventors believe that while knitted fabrics achieve sweat absorption through wool fibers, the high hydrophilicity of wool fibers slows down the evaporation of moisture from sweat. Furthermore, while absorbing sweat, microorganisms from the sweat can also enter the knitted fabric, easily leading to their growth. Additionally, wool fibers have poor machine washability, which negatively impacts the washability of antibacterial and warm fabrics. Summary of the Invention

[0005] The shrink-resistant wool fibers used in related technologies have good hydrophilicity, which slows down the evaporation of moisture from sweat. However, while the knitted fabric absorbs sweat, microorganisms from the sweat also enter the fabric, easily leading to their growth. Furthermore, wool fibers have poor machine washability, which affects the washability of antibacterial and warm fabrics. To improve these shortcomings, this application provides an antibacterial far-infrared warm knitted material and an antibacterial warm fabric.

[0006] In a first aspect, this application provides an antibacterial far-infrared thermal knitted material, employing the following technical solution:

[0007] An antibacterial far-infrared warm knitted material, wherein the knitted material is a yarn made of at least two fibers, including multifunctional polyester fiber and shrink-resistant wool fiber, wherein the multifunctional polyester fiber contains far-infrared powder.

[0008] By adopting the above technical solution, far-infrared powder absorbs heat emitted by the human body and external heat, converting the heat into far-infrared radiation, which is then transferred back to the human body. Far-infrared radiation promotes blood circulation and enhances the warmth retention of fabrics. It also weakens the hydrogen bonds between water molecules. These hydrogen bonds are directly related to the evaporation rate of water; weakening them reduces the energy required for evaporation, making evaporation easier. Therefore, when the knitted material of this application absorbs sweat, the far-infrared radiation released by the tourmaline powder accelerates the evaporation of moisture from the sweat, helping to reduce the time sweat remains in the fabric, promoting evaporation, and improving the fabric's quick-drying and washability. Simultaneously, the blending of shrink-resistant wool fibers and fibers including multifunctional polyester fibers achieves machine-washable and easy-care properties. Furthermore, far-infrared radiation kills bacteria, thus the knitted material of this application also possesses antibacterial properties, helping to reduce bacterial growth within the fabric.

[0009] Preferably, the multifunctional polyester fiber contains 4-8% by mass of far-infrared powder, which is tourmaline powder.

[0010] By adopting the above technical solution, the content of far-infrared powder is optimized, which greatly improves the quick-drying effect of knitted materials while saving raw material usage, and at the same time achieves the effect of being machine washable and easy to care for.

[0011] Preferably, the tourmaline powder has an average particle size of 0.82-1.20 μm.

[0012] By adopting the above technical solution, when the average particle size of tourmaline powder is too small, the agglomeration of tourmaline powder will affect the uniform dispersion of tourmaline powder. Conversely, when the average particle size of tourmaline powder is too large, the density of tourmaline powder distribution is limited. Through optimization, when the average particle size of tourmaline powder is 0.82-1.20 μm, there is less agglomeration and the distribution is more uniform, which helps improve the quick-drying effect of knitted materials and achieves machine-washable and easy-care properties.

[0013] Preferably, the multifunctional polyester fiber contains 1.2% sodium stearate by mass.

[0014] By adopting the above technical solution, the tourmaline powder is more evenly dispersed in the multifunctional polyester fiber with added sodium stearate, reducing the agglomeration of tourmaline powder, which helps to improve the quick-drying performance of the fabric, and at the same time achieves the effect of machine washing and easy care.

[0015] Preferably, the tourmaline powder has an average particle size of 0.32-0.45 μm.

[0016] By adopting the above technical solution, the average particle size of tourmaline powder was further optimized by adding sodium stearate, which helps to improve the quick-drying effect of knitted materials and achieve the effect of machine washing and easy care.

[0017] Preferably, the knitted material is a blend of multifunctional polyester fiber, shrink-resistant wool fiber, and modified Tencel fiber. The modified Tencel fiber is a Tencel fiber with chitosan adsorbed on its surface, and the modified Tencel fiber is prepared according to the following method:

[0018] (1) Potassium thiocyanate and ethylenediamine are mixed and pre-cooled to obtain a swelling agent. Chitosan is added to the swelling agent and stirred for 4-5 hours to obtain a modified solution for later use. The mass fraction of chitosan in the modified solution is 5%.

[0019] (2) Soak the Tencel fiber in the modification solution for 8-10 minutes, then take out the Tencel fiber and transfer it to the setting solution for 20-30 minutes. After soaking, take out the Tencel fiber from the setting solution, and obtain the modified Tencel fiber after soaking, washing and drying. In this step, the setting solution includes methanol.

[0020] By adopting the above technical solution, after the fabric absorbs sweat, the water molecules in the sweat also absorb far-infrared rays, resulting in the far-infrared radiation's antibacterial effect not being fully realized. Therefore, this application preferentially uses modified Tencel fiber as one of the raw materials for producing antibacterial far-infrared thermal knitted materials. The chitosan adsorbed on the surface of the modified Tencel fiber has a contact-killing effect on microorganisms. Even if the far-infrared radiation's antibacterial effect cannot be fully realized, chitosan can still kill bacteria carried in sweat, thereby improving the fabric's antibacterial properties and helping to reduce the reproduction of microorganisms inside the fabric.

[0021] To prepare modified Tencel fibers, this application first prepared a swelling agent, then used the swelling agent to dissolve chitosan, obtaining a modification solution. After immersing the Tencel fibers in the modification solution, the fibers swelled, and the chitosan dissolved in the modification solution was adsorbed onto the surface of the Tencel fibers. When the Tencel fibers left the modification solution, the cellulose on the surface was in a swollen state and adsorbed a certain amount of chitosan. After soaking in a setting solution, the cellulose-chitosan complex precipitated on the surface of the Tencel fibers. After washing and drying, the Tencel fibers with chitosan adsorbed on the surface were obtained, which is the modified Tencel fiber.

[0022] Preferably, in step (2) of preparing the modified Tencel fiber, the Tencel fiber retrieved from methanol is soaked and washed for 8-12 minutes using a copper ammonia solution with a concentration of 0.20-0.25 mol / L.

[0023] By employing the above technical solution, during the soaking and washing process, the cuprammonium solution reacts with cellulose and chitosan to produce copper ion complexes. After washing with the cuprammonium solution, the resulting modified Tencel fibers are loaded with copper ions, which, combined with chitosan, produce a stronger bactericidal effect. Furthermore, the cuprammonium solution has a certain dissolving effect on cellulose, further increasing the porosity of the modified Tencel fibers, thereby improving their breathability, facilitating water vapor diffusion, improving the quick-drying effect of knitted materials, and achieving machine washability and easy care.

[0024] Preferably, the setting solution also includes cinnamaldehyde.

[0025] By employing the above technical solution, cinnamaldehyde exhibits good compatibility with chitosan and readily adsorbs onto it. During the soaking of Tencel fibers in the setting solution, cinnamaldehyde dissolved in methanol comes into contact with the Tencel fibers and adsorbs onto the precipitated chitosan-cellulose complex. Cinnamaldehyde can enhance the antibacterial activity of chitosan, thus contributing to improved antibacterial properties of knitted materials and fabrics made from them.

[0026] Preferably, the setting solution also includes catechins.

[0027] By employing the above technical solution, during the process of soaking Tencel fibers in the setting solution, catechins are adsorbed onto the chitosan-cellulose complex and remain on the surface of the modified Tencel fibers. While synergistically inhibiting bacteria with chitosan, catechins can also react with odor-causing substances produced by microorganisms, helping to eliminate the odor emitted by the modified Tencel fibers after absorbing sweat.

[0028] Secondly, this application provides an antibacterial and thermal insulation fabric, which adopts the following technical solution.

[0029] An antibacterial and thermal insulation fabric, wherein the antibacterial and thermal insulation fabric is processed from any of the antibacterial far-infrared thermal insulation knitted materials described above, and the processing method of the antibacterial and thermal insulation fabric includes the following steps:

[0030] (1) First, the wool fiber is subjected to an anti-shrinkage process to obtain anti-shrinkage wool fiber. Then, the anti-shrinkage wool fiber is combed as a whole. During the combing process, wool oil and antistatic agent are added. After the combing is completed, the wool fiber is left to stand for a period of time. Then, the anti-shrinkage wool fiber is blended with at least one fiber, including multifunctional polyester fiber, to obtain antibacterial far-infrared warm knitted material.

[0031] (2) High-temperature degreasing pretreatment is carried out on antibacterial far-infrared warm knitted materials, and then wool reactive dyes and cationic dyes are used for dyeing according to the same bath dyeing process. After dyeing, dehydration, drying, spinning, and waxing are carried out in sequence to obtain colored yarn.

[0032] (3) Using colored yarn as raw material, weave on a weft knitting computer flat knitting machine to obtain a machine washable antibacterial and warm fabric.

[0033] By adopting the above technical solution, this application combines wool fibers with multifunctional polyester fibers after shrinkage prevention treatment and optimizes the spinning process to promote moisture evaporation, which helps to improve the quick-drying and washing performance of the fabric, achieving the effect of machine washing and easy care. The antibacterial and warm fabric made from the antibacterial far-infrared warm knitting material of this application can not only absorb sweat, but also has better quick-drying performance than the fabrics in related technologies, and has certain antibacterial properties, which helps to reduce the growth of microorganisms inside the fabric. The high-temperature pretreatment in step (2) can remove oil and impurities from the fiber surface, reduce damage to wool in the yarn, improve the dyeing rate and dyeing performance, and make the dye be better adsorbed onto the fiber; wool reactive dyes and cationic dyes have good color matching with wool and multifunctional polyester fibers, which helps to improve product quality.

[0034] In summary, this application has the following beneficial effects:

[0035] 1. After absorbing sweat, the tourmaline powder in the knitted material of this application releases far-infrared radiation, which promotes moisture evaporation and helps improve the quick-drying performance of the fabric, while also achieving a machine-washable and easy-care effect. In addition, far-infrared radiation also has a certain antibacterial effect, which helps reduce the growth of bacteria inside the fabric.

[0036] 2. In the scheme of this application, the chitosan adsorbed on the surface of Tencel fiber can play a certain antibacterial role, reducing the growth of microorganisms caused by prolonged soaking in sweat. The Tencel fiber with chitosan adsorbed on the surface is impregnated and washed with cuprammonium solution, which loads copper ions in the modified Tencel fiber. The dissolving effect of cuprammonium solution on cellulose increases the porosity in the Tencel fiber, resulting in modified Tencel fiber with better antibacterial and breathable properties. This helps to improve the quick-drying performance of knitted materials and reduce the growth of microorganisms in the fabric. Detailed Implementation

[0037] The present application will be further described in detail below with reference to the embodiments, preparation examples and comparative examples. The raw materials involved in the present application can all be obtained commercially.

[0038] Preparation example of modified Tencel fiber

[0039] The following explanation uses Preparation Example 1 as an example.

[0040] Preparation Example 1

[0041] In this preparation example, the modified Tencel fiber was prepared according to the following method:

[0042] (1) Potassium thiocyanate and ethylenediamine were mixed in a weight ratio of 3:7 and pre-cooled at -19℃ for 12 hours to obtain a swelling agent. Chitosan at 5% by weight of the swelling agent was added to the swelling agent and stirred for 4 hours to obtain a modified solution for later use.

[0043] (2) Soak the Tencel fiber in the modification solution for 8 minutes, then take out the Tencel fiber and transfer it to the setting solution for 25 minutes. After soaking, take out the Tencel fiber from the setting solution, soak and wash it in deionized water (for 10 minutes) and dry it to obtain the modified Tencel fiber. In this step, the setting solution is methanol.

[0044] Preparation Example 2

[0045] The difference between this preparation example and preparation example 1 is that in step (2) of preparing modified Tencel fibers, the Tencel fibers retrieved from methanol are soaked and washed for 10 minutes using a copper ammonia solution with a concentration of 0.22 mol / L.

[0046] Preparation Example 3

[0047] The difference between this preparation example and Preparation Example 1 is that the setting solution is made by mixing cinnamaldehyde and methanol in a weight ratio of 1:19.

[0048] Preparation Example 4

[0049] The difference between this preparation example and Preparation Example 1 is that the setting solution is made by mixing catechin and methanol in a weight ratio of 1:19.

[0050] Example of preparing shrink-resistant wool fibers

[0051] The following explanation uses Preparation Example 5 as an example.

[0052] Preparation Example 5

[0053] In this preparation example, the shrink-resistant wool fiber was prepared according to the following method:

[0054] (1) Chlorination: Chlorine gas is mixed with ice water in the fiber treatment equipment to obtain chlorination modified solution, and then wool fibers are immersed in the chlorination modified solution for 30 minutes; in this step, the amount of chlorine gas used is 2.5% of the weight of wool fibers.

[0055] (2) Dechlorination: Measure the residual chlorine content in the chlorination modified liquid, and then add sodium bisulfite to the fiber treatment equipment with a weight equivalent to 1.8 times the weight of the residual chlorine (based on chlorine molecules);

[0056] (3) Neutralization: Add sodium carbonate to the fiber treatment equipment to adjust the pH of the chlorinated modified solution to 9.8;

[0057] (4) Washing: Add water to the fiber processing equipment to wash the wool fibers;

[0058] (5) Resin filling: Cationic polyamide resin is added to the fiber processing equipment and mixed with wool fibers. The weight of cationic polyamide resin is 2.2% of the weight of wool fibers.

[0059] (6) Softening treatment: Cationic fatty acid softener is added to the fiber processing equipment and mixed with wool fibers to soften the wool fibers;

[0060] (7) Drying: Baking and curing are carried out to bring the moisture regain of wool fibers to below 10%.

[0061] (8) Pin combing: The wool fibers are pin combed three times to obtain shrink-resistant wool fibers (110S ultrafine shrink-resistant wool fibers).

[0062] Example

[0063] Examples 1-5

[0064] The following description uses Example 1 as an example.

[0065] Example 1

[0066] In this embodiment, the antibacterial far-infrared warm knitted material is a blended yarn made by blending multifunctional polyester fiber and shrink-resistant wool fiber from Preparation Example 5 in a weight ratio of 3:7. The multifunctional polyester fiber is a genetically modified fiber provided by Jiangsu Nadun Technology Co., Ltd., with a sliver weight of 20.5 g / m. The multifunctional polyester fiber contains 4% far-infrared powder by mass, and the remaining components are PET. The far-infrared powder is tourmaline powder with an average particle size of 1.25 μm.

[0067] In this embodiment, the antibacterial far-infrared warm knitted material is produced using a blending process, which specifically consists of two stages: combing and spinning, as detailed below:

[0068] Recombing process:

[0069] (1) The 110S ultrafine anti-shrink wool fiber is combed in its entirety. During the combing process, wool oil and antistatic agent are added. The weight of the anti-shrink wool fiber sliver after combing is 22.5g / m. It is stored for 12 hours to allow the oil and water to mix thoroughly and evenly.

[0070] (2) Mix the whole strand of anti-shrink wool fiber with multifunctional polyester fiber and comb it. At this time, the needle plate is No. 4 needle plate. After three mixing combs, it is combed.

[0071] (3) Remove impurities such as hair particles, short hairs, and grass clippings through a combing process;

[0072] (4) After the combing is completed, the combing is performed twice more. The combing is done with No. 9 and No. 6 needle plates respectively. The combing process is now complete. The weight of the combed wool top is 18.6g / m.

[0073] Spinning process:

[0074] (1) The combed finished wool top passes through four needle combs. During the four needle combing process, the needle plate number increases sequentially to make the yarn even and the fibers tightly bound. The spinning weight of the wool top decreases sequentially to facilitate the roving process. The yarn weight after four needle combing is 2.3g / m.

[0075] (2) After four needles, the roving process is carried out, with a draft of 10 times. The roving weight is 0.23g / m. Then, the draft on the spinning machine is 19.5 times, and the single yarn is 84.8Nm / 1 with a Z-direction twist of 785T / M. After the spinning process, the defects are removed on the winding machine to remove defects such as fuzz, thick knots, and thin knots.

[0076] (3) Combine the three single yarns together, and after the yarn is combined, perform a doubling process, twisting 410T / M in the S direction to obtain antibacterial far-infrared warm knitted material.

[0077] This embodiment also provides an antibacterial and thermal insulation fabric, the processing method of which includes the following steps:

[0078] (1) The wool fiber was subjected to an anti-shrinkage process according to the preparation method of Example 5 to obtain anti-shrinkage wool fiber. Then, the anti-shrinkage wool fiber was combed in the whole sliver according to the above-mentioned combing and spinning process (wool oil and antistatic agent were added during combing, and the whole sliver was left to stand after combing). The anti-shrinkage wool fiber was then blended with at least one fiber, including multifunctional polyester fiber, to obtain antibacterial far-infrared warm knitted material.

[0079] (2) The antibacterial far-infrared warm knitted material is subjected to high-temperature degreasing pretreatment (temperature is 80℃), and then dyed with wool reactive dye and cationic dye according to the same bath dyeing process. After dyeing, it is dehydrated, dried, spun, and waxed in turn to obtain colored yarn.

[0080] (3) Using colored yarn as raw material, weaving is carried out on a weft knitting computer flat knitting machine to obtain machine washable antibacterial and warm fabric. The machine washable antibacterial and warm fabric can be made into a sweater after sewing.

[0081] As shown in Table 1, the main difference between Examples 1-5 is that the mass fraction of far-infrared powder is different in the multifunctional polyester fiber.

[0082] Table 1 Mass fraction of far-infrared powder

[0083] sample Mass fraction of far-infrared powder / % Example 1 2 Example 2 4 Example 3 6 Example 4 8 Example 5 10

[0084] Examples 6-9

[0085] As shown in Table 2, the difference between Examples 6-9 and Example 3 is that the average particle size of the tourmaline powder is different.

[0086] Table 2 Average particle size of tourmaline powder

[0087]

[0088] Example 10

[0089] The difference between this embodiment and Embodiment 9 is that, in addition to far-infrared powder, the multifunctional polyester fiber also contains 1.2% sodium stearate by mass, and the remaining components are all PET.

[0090] As shown in Table 3, the difference between Embodiments 11-15 and Example 10 is that the average particle size of the tourmaline powder is different.

[0091] Table 3 Average particle size of tourmaline powder

[0092] sample Example 10 Example 11 Example 12 Example 13 Example 14 Example 15 Average particle size / μm 0.75 0.50 0.45 0.38 0.32 0.28

[0093] Example 16

[0094] The difference between this embodiment and Embodiment 3 is that the antibacterial far-infrared warm knitted material is a blended yarn made by blending multifunctional polyester fiber, shrink-resistant wool fiber and modified Tencel fiber of Preparation Example 1 in a weight ratio of 3:5:2.

[0095] Example 17

[0096] The difference between this embodiment and Example 3 is that the modified Tencel fiber is prepared according to the method of Preparation Example 2.

[0097] Example 18

[0098] The difference between this embodiment and Example 3 is that the modified Tencel fiber is prepared according to the method of Preparation Example 3.

[0099] Example 19

[0100] The difference between this embodiment and Example 3 is that the modified Tencel fiber is prepared according to the method of Preparation Example 4.

[0101] Comparative Example

[0102] Comparative Example 1

[0103] The difference between this comparative example and Example 1 is that, in step (2) of the combing stage, the multifunctional polyester fiber is replaced with PET polyester fiber.

[0104] Comparative Example 2

[0105] The difference between this comparative example and Example 16 is that the modified Tencel fiber and shrink-resistant wool fiber are replaced by equal weights with commercially available Tencel fiber.

[0106] Comparative Example 3

[0107] The difference between this embodiment and Embodiment 1 is that the 110S ultrafine shrink-resistant wool fiber is replaced with wool fiber that has not undergone shrink-resistant treatment.

[0108] Performance testing methods

[0109] Sample fabrics: antibacterial and thermal fabrics of each embodiment and comparative example.

[0110] I. Moisture Absorption and Quick-Drying Test

[0111] The unidirectional transfer index, wetting time, and water absorption rate were evaluated in accordance with GB / T 21655.2-2019 Evaluation of the moisture absorption and quick-drying properties of textiles - Part 2: Dynamic moisture transfer method. The results are shown in Table 4.

[0112] Table 4 Unidirectional Transmission Index

[0113]

[0114]

[0115] II. Antibacterial Efficiency Test

[0116] The antibacterial rates of the sample fabrics in Examples 3, 16, 17, 18, and 19 were determined according to GB / T 20944.3-2008 Evaluation of Antibacterial Properties of Textiles Part 3: Oscillation Method. The results are shown in Table 5.

[0117] Table 5 Antibacterial rate

[0118] sample Antibacterial rate / % Example 3 91.4 Example 16 94.8 Example 17 98.5 Example 18 96.9 Example 19 97.4 Comparative Example 2 91.7

[0119] III. Anti-pilling and anti-shrinkage tests

[0120] Referring to the "Pilling Box Method" (GB / T 4802.3-2008), the pilling rating of the sample fabrics corresponding to Examples 1-5 was tested under the condition of 14,400 pilling revolutions. The results are shown in Table 6.

[0121] Table 6 Pilling and Friction Rating

[0122] sample Pilling / Falling Rating / Grade Example 1 3 Example 2 3 Example 3 3.5 Example 4 3.5 Example 5 3

[0123] Referring to "FZ / T 70009-2021 Test Method for Relaxation Dimensional Change and Feltification Dimensional Change of Wool Textile Products after Machine Washing", the relaxation dimension was measured according to washing program 1×4G and the felting dimension according to washing program 2×4N. The relaxation dimension change rate (%) [garment] and the felting dimension change rate (%) [garment] of the sample fabrics corresponding to Examples 1-5 were tested. The results are shown in Table 7.

[0124] The wash fastness ratings of the sample fabrics corresponding to Examples 1-5 were tested according to GB / T 12490-2014 Textiles - Tests for Color Fastness to Household and Commercial Washing. The results are shown in Table 7.

[0125] Table 7 Lateral Shrinkage Rate

[0126]

[0127] Combining Examples 1-5 and Comparative Example 1 with Table 4, it can be seen that the unidirectional transfer index measured in Examples 1-5 is greater than that in Comparative Example 1, indicating that the application of multifunctional polyester fiber in Examples 1-5 improves the quick-drying performance of knitted materials and antibacterial and warm fabrics. The unidirectional transfer index measured in Examples 1-5 gradually increases; however, as the tourmaline powder content in the multifunctional polyester fiber increases, the unidirectional transfer index does not change linearly, but rather shows a gradually decreasing growth rate. To fully conserve raw materials and control costs while achieving better performance, Examples 2-4 are the preferred solutions.

[0128] Based on Examples 1-5, Comparative Example 3, and Tables 6-7, it can be seen that the antibacterial and thermal fabric produced according to the method of this application can achieve a pilling rating of 3-4. Furthermore, the relaxation dimensional change rate [garment], felting dimensional change rate [garment], and wash fastness all meet the requirements of relevant specifications, exhibiting excellent anti-pilling, anti-shrinkage, and anti-fading properties, superior to Comparative Example 3. This result indicates that after the anti-shrinkage process, the reactive groups on the surface of the wool fibers increase. Simultaneously, the cationic polyamide resin alters the scale structure, reducing wool felting, and the cationic fatty acid softener reduces the degree of polymerization of the cationic polyamide resin, softening the wool fibers. Because the scale structure on the surface of the wool fibers softens and its lifting degree decreases, the smoothness of the anti-shrinkage wool fiber surface is improved, reducing the possibility of pilling after friction in the fabric and improving the anti-pilling performance of the fabric. At the same time, the reduced degree of lifting of the scale-like structure can also reduce the degree of entanglement between the shrink-resistant wool fibers, thereby inhibiting the shrinkage of the shrink-resistant wool fibers and achieving the effect of machine washing and easy care.

[0129] Combining Examples 3 and 6-9 with Table 4, it can be seen that within the range of 0.75-1.25 μm, the unidirectional transfer index first increases and then decreases as the average particle size of tourmaline powder decreases. This indicates that when the average particle size of tourmaline powder is too small, the agglomeration of tourmaline powder particles will affect the uniform dispersion of tourmaline powder. Conversely, when the average particle size of tourmaline powder is too large, the density of tourmaline powder distribution is limited. When the average particle size of tourmaline powder is 0.82-1.20 μm, there is less agglomeration of tourmaline powder, and the distribution is more uniform, which helps to improve the quick-drying effect of knitted materials.

[0130] As can be seen from Examples 9 and 10 and Table 4, sodium stearate reduces the agglomeration of tourmaline powder and promotes its dispersion, thereby improving the quick-drying effect of knitted materials.

[0131] Based on Examples 10 and 11-15 and Table 4, it can be seen that after further reducing the average particle size of tourmaline powder based on Example 10, the quick-drying effect of the knitted material is still improved to a certain extent. However, when the average particle size of tourmaline powder is less than 0.32 μm, the growth of the unidirectional transfer index is slow. In order to fully save raw materials and control costs, and achieve better performance, the preferred solution is Examples 12-14.

[0132] As can be seen from Examples 3, 16-19, and Table 5, the antibacterial properties of the fabric are improved after the modified Tencel fiber replaces a portion of the shrink-resistant wool fiber. Furthermore, in the preparation process of the modified Tencel fiber, soaking and washing with a copper ammonia solution, and adding cinnamaldehyde and catechins to the setting solution can all improve the antibacterial properties of the antibacterial and warm-keeping fabric, helping to reduce bacterial growth in the fabric.

[0133] Based on Examples 3, 16, and Comparative Example 2, and in conjunction with Table 5, it can be seen that the antibacterial rate measured in Comparative Example 2 is close to that in Example 3, but less than that in Example 16. This indicates that the improvement in the antibacterial performance of Example 16 is not due to the properties of Tencel fiber itself.

[0134] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. An antibacterial far-infrared thermal knitted material, characterized in that, The knitted material is a yarn composed of a blend of multifunctional polyester fiber, shrink-resistant wool fiber, and modified Tencel fiber. The multifunctional polyester fiber contains 4-8% by mass of far-infrared powder, which is tourmaline powder with an average particle size of 0.32-0.45 μm. The multifunctional polyester fiber contains 1.2% by mass of sodium stearate. The modified Tencel fiber is a Tencel fiber with chitosan adsorbed on its surface. The modified Tencel fiber is prepared according to the following method: (1) Potassium thiocyanate and ethylenediamine are mixed and pre-cooled to obtain a swelling agent. Chitosan is added to the swelling agent and stirred for 4-5 hours to obtain a modified solution for later use. The mass fraction of chitosan in the modified solution is 5%. (2) Soak the Tencel fiber in the modification solution for 8-10 minutes, then take out the Tencel fiber and transfer it to the setting solution for 20-30 minutes. After soaking, take out the Tencel fiber from the setting solution, and obtain the modified Tencel fiber after soaking, washing and drying. In this step, the setting solution includes methanol. In this step, a copper ammonia solution with a concentration of 0.20-0.25 mol / L is used to soak and wash the Tencel fiber taken out from the methanol for 8-12 minutes.

2. The antibacterial far-infrared thermal knitted material according to claim 1, characterized in that, The setting solution also includes cinnamaldehyde.

3. The antibacterial far-infrared thermal knitted material according to claim 1, characterized in that, The setting solution also includes catechins.

4. An antibacterial and warm fabric, characterized in that, The antibacterial and warm fabric is made from the antibacterial far-infrared warm knitted material according to any one of claims 1-3, and the processing method of the antibacterial and warm fabric includes the following steps: (1) First, the wool fiber is subjected to an anti-shrinkage process to obtain anti-shrinkage wool fiber. Then, the anti-shrinkage wool fiber is combed as a whole. During the combing process, wool oil and antistatic agent are added. After the combing is completed, the wool fiber is left to stand for a period of time. Then, the anti-shrinkage wool fiber is blended with at least one fiber, including multifunctional polyester fiber, to obtain antibacterial far-infrared warm knitted material. (2) The antibacterial far-infrared warm knitted material is subjected to high-temperature degreasing pretreatment, and then dyed with wool reactive dye and cationic dye according to the same bath dyeing process. After dyeing, it is dehydrated, dried, spun, and waxed in turn to obtain colored yarn. (3) Using colored yarn as raw material, weave on a weft knitting computer flat knitting machine to obtain a machine washable antibacterial and warm fabric.

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