A multi-functional knitted fabric and a manufacturing process thereof

Abstract

The application belongs to the technical field of textiles, and specifically discloses a multifunctional knitted fabric and a manufacturing process thereof. The multifunctional knitted fabric comprises a surface layer, elastic threads and an inner layer, the surface layer and the inner layer are connected through the elastic threads, and an air layer structure is formed between the surface layer and the inner layer; the surface layer is knitted by acrylic, cotton and antibacterial viscose blended yarn; the inner layer is knitted by cotton and viscose blended yarn or by acrylic, cotton and antibacterial viscose blended yarn; and the elastic threads are low-temperature spandex. The multifunctional knitted fabric prepared in the application has good air permeability, mechanical strength, antibacterial property and antibacterial durability.

Description

Technical Field

[0001] This application relates to the field of textile technology, and in particular to a multifunctional knitted fabric and its manufacturing process. Background Technology

[0002] With the development of the clothing industry, people's requirements for clothing are no longer limited to workmanship and style. They are paying more attention to the quality of clothing, and functional requirements such as environmental protection, lightweight, comfort and antibacterial properties are becoming increasingly important topics.

[0003] In daily life, people inevitably come into contact with various bacteria and fungi. As epidemic prevention enters a normalized mode, people have a stronger demand for health protection. Fabric products with antibacterial and bacteriostatic functions have emerged. Antibacterial fabrics can remove bacteria, fungi and mold from fabrics, keep fabrics clean, and reduce the chance of bacterial regeneration and reproduction, thus providing a certain degree of health protection for people.

[0004] There are currently many processes for preparing nano-silver antibacterial fabrics, such as the impregnation method. In existing technologies, nano-silver particles in nano-silver finishing solution are loaded onto polyester fabrics through the impregnation method, achieving an antibacterial efficiency of 99.9%. However, since nano-silver ions only exist on the surface of the fabric and are not resistant to washing, the antibacterial effect is difficult to maintain, which greatly affects the antibacterial properties of textiles. Summary of the Invention

[0005] To address the issue of poor antibacterial properties caused by easy wear and tear in fabrics loaded with silver nanoparticles, this application provides a multifunctional knitted fabric and its manufacturing process.

[0006] This application provides a multifunctional knitted fabric, which adopts the following technical solution:

[0007] A multifunctional knitted fabric includes a face layer, elastic yarns, and an inner layer, wherein the face layer and the inner layer are connected by elastic yarns, and an air layer structure is formed between the face layer and the inner layer.

[0008] The surface layer is woven from a blend of acrylic, cotton, and antibacterial viscose fiber yarn;

[0009] The inner layer is woven from a blend of cotton and viscose fiber yarn or from a blend of acrylic, cotton, and antibacterial viscose fiber yarn.

[0010] The elastic thread is made of low-temperature spandex.

[0011] By adopting the above technical solution, the sandwich air layer fabric, consisting of an outer layer, an inner layer, and elastic threads, achieves both lightweight and warmth. Simultaneously, the outer and inner layers are connected by elastic threads, giving the fabric elasticity and comfortable wear. A hollow, stationary air layer is formed between the outer and inner layers, isolating the body from external airflow. This hollow, stationary air layer replaces the thermal wadding found in conventional cotton clothing, providing warmth while remaining lightweight. It also quickly wicks away sweat, ensuring the fabric remains cool, breathable, and dry.

[0012] The outer layer is woven from acrylic, cotton, and antibacterial viscose fiber. Acrylic has good elasticity, a soft feel, and good warmth retention. Cotton has good breathability and comfort. Antibacterial viscose fiber has good antibacterial and antistatic properties, good moisture absorption and breathability, a soft feel, good luster, and good dyeing performance. At the same time, antibacterial viscose fiber has good antibacterial durability, which makes the fabric maintain excellent antibacterial durability. The blend of acrylic, cotton, and antibacterial viscose fiber combines the advantages of each component, makes up for the shortcomings of each other, and improves the overall performance of the fabric.

[0013] The inner layer is woven from a blend of cotton and viscose fibers or from a blend of acrylic, cotton, and antibacterial viscose fibers. Cotton has good moisture absorption, absorbing sweat from the body and ensuring the fabric remains soft and comfortable against the skin. Viscose blended yarn has excellent moisture absorption, is breathable and soft, and is antistatic. The blend of cotton and viscose fibers further enhances the fabric's breathability and antistatic properties, increasing wearer comfort. The elastic thread is made of low-temperature spandex, which has good shape retention, excellent elasticity, and high breaking strength. As an elastic thread, it ensures the structural shape and elasticity of both the inner and outer layers, resulting in a superior fabric structure. The outer and inner layers, along with the elastic thread, work together to create a multifunctional knitted fabric that is elastic, breathable, antistatic, moisture-absorbing, antibacterial, lightweight, and warm.

[0014] Preferably, in the outer layer, the weight percentages of each component are: 35-45% acrylic fiber, 25-35% cotton, and 25-35% antibacterial viscose fiber; in the inner layer, the weight percentages of each component are: 45-55% cotton and 45-55% viscose fiber; or 35-45% acrylic fiber, 25-35% cotton, and 25-35% antibacterial viscose fiber.

[0015] By adopting the above technical solution and setting an appropriate range of dosage ratios, the performance of each component is optimized. Acrylic fiber, as the main raw material of the outer layer, has good warmth retention, while cotton fiber has good moisture absorption. The two complement each other, ensuring the fabric's warmth retention and antistatic properties. Antibacterial viscose fiber has good antibacterial properties, which can kill and inhibit bacteria, giving the fabric good antibacterial performance and long-lasting antibacterial properties. The inner layer is the layer closest to human skin. The blended yarn of cotton and viscose fiber not only maintains a comfortable and soft touch but also has good breathability, allowing the skin to sweat in time, which helps to keep the skin dry and the body comfortable.

[0016] Preferably, the weight percentages of the surface layer, inner layer, and elastic thread are as follows: surface layer 41-51%, inner layer 41-51%, and elastic thread 3-13%.

[0017] By adopting the above technical solution and setting appropriate weight percentages for the outer layer, inner layer, and elastic yarn, a multifunctional knitted fabric with superior performance is obtained. The amount of elastic yarn used in the outer and inner layers is relatively small, ensuring the comprehensive performance of the outer and inner layers. This results in a fabric with comprehensive properties such as good breathability, good antibacterial properties, antistatic properties, lightweight and warmth.

[0018] Preferably, the method for preparing the antibacterial viscose fiber includes the following steps:

[0019] (1) Grind the extract of Coralgranatum into powder with a particle size of less than 5 μm, then dissolve it in ethanol, sonicate it, add fatty acid sulfonyl ester, continue sonicating, and set aside.

[0020] (2) Disperse the modified chitosan in an acetic acid solution, heat it to 80-90℃, stir it thoroughly to dissolve it, and then add activated carbon to obtain a chitosan solution for later use;

[0021] (3) The extract treated in step (1), the chitosan solution obtained in step (2) and the viscose fiber spinning solution are mixed, and the mixture is degassed after high-speed stirring. The mixture is then spun using a wet spinning process and dried after oiling. The total draw ratio is 110-120%, the total spinning speed is 50-60 m / min, and the coagulation bath temperature is 45-50℃.

[0022] By adopting the above technical solution, the extract of *Sarcandra glabra* has a broad-spectrum antibacterial effect and inhibits *Staphylococcus aureus*, *Escherichia coli*, and *Candida albicans*. The extract of *Sarcandra glabra* is dissolved in ethanol to prepare a solution, and fatty acid sulfonyl esters are added to effectively disperse the extract of *Sarcandra glabra* and stabilize the solution system.

[0023] Modified chitosan has good antibacterial, bacteriostatic, sweat-absorbing, and deodorizing functions. Activated carbon has a rich porous structure and good adsorption and antibacterial properties. Modified chitosan loaded on the surface of activated carbon forms a three-dimensional network porous structure. This three-dimensional network porous structure and the porous structure of activated carbon itself combine to form a synergistic effect, exerting a high adsorption capacity and antibacterial properties. This further enhances the adsorption and antibacterial properties of modified chitosan, and further increases its inhibitory effect on Escherichia coli, Candida albicans, and Staphylococcus aureus.

[0024] The treated *Sarcandra glabra* extract, modified chitosan solution, and viscose fiber spinning solution were mixed and spun directly. This mixture increased the mechanical strength of the subsequent spinning process while ensuring high and long-lasting antibacterial properties. Furthermore, the mixture exhibited good structural stability and compatibility. The *Sarcandra glabra* extract was loaded onto the porous surface of activated carbon, where the activated carbon and modified chitosan mutually adsorbed each other, further increasing the adsorption between the three components and contributing to the system's stability. The resulting spun fibers exhibited excellent overall performance.

[0025] Preferably, the mass ratio of the herb extract, modified chitosan, and activated carbon is 1:0.5-0.8:0.1-0.3.

[0026] By adopting the above technical solution and controlling the mass ratio of *Sarcandra glabra* extract, modified chitosan, and activated carbon within a certain range, a spinning mixture with superior comprehensive performance is obtained. Ultimately, a spun yarn with high mechanical strength, high antibacterial properties, and good antibacterial durability is obtained. *Sarcandra glabra* extract increases the antibacterial properties and antibacterial durability of the spinning mixture. Modified chitosan and activated carbon not only increase the antibacterial properties and antibacterial durability of the mixture but also increase the mechanical strength of subsequent spinning. The spun yarn prepared subsequently has good comprehensive performance.

[0027] Preferably, the preparation method of the *Sarcandra glabra* extract includes the following steps: soaking *Sarcandra glabra* in water, heating to 65-75℃, stirring at 50-60 r / min for 25-30 min, then adding citric acid and cellulase, stirring for 20-30 min, filtering to obtain the treated *Sarcandra glabra* and filtrate, then pulverizing the treated *Sarcandra glabra*, adding ethanol solution and the filtrate, heating under reflux for 2-3 h, concentrating under reduced pressure and drying to obtain the *Sarcandra glabra* extract.

[0028] By employing the above technical solution, *Sargassum fusiforme* is soaked in heated water to enhance its biological activity and ensure the extraction of its nutrients. Citric acid is then added to further activate the active ingredients. Cellulase, with its biocatalytic activity, accelerates the extraction of these active ingredients, dissolving them in the filtrate. The treated *Sargassum fusiforme* and filtrate are then mixed and refluxed again to obtain the *Sargassum fusiforme* extract. Separating the treated *Sargassum fusiforme* and filtrate before adding the filtrate and ethanol to the pulverized *Sargassum fusiforme* further improves the extraction rate, resulting in a higher extraction rate of active ingredients and ensuring the bactericidal properties and long-lasting bactericidal effect of the extract.

[0029] Preferably, the method for preparing the modified chitosan includes the following steps:

[0030] (1) Dissolve chitosan in acetic acid solution and stir for 3-5 hours. Then add 0.01-0.5 g / L of graphene, stir for 1-3 hours, dry and set aside.

[0031] (2) Disperse bamboo charcoal fiber in sodium hydroxide solution, stir for 1-2 hours, wash with water, then add wood powder, sonicate for 10-30 minutes, then add chitosan treated in step (1), continue stirring for 5-8 hours, centrifuge and dry to obtain modified chitosan.

[0032] By adopting the above technical solution, chitosan has better antibacterial properties, but poor mechanical properties. Graphene has better antibacterial properties and mechanical properties. When chitosan and graphene are mixed, the abundant primary amines and hydroxyl groups on the chitosan backbone and the large number of carboxyl groups and hydroxyl groups on the graphene sheet structure can form complex non-covalent interactions to build a three-dimensional network structure, which increases the mechanical properties of chitosan.

[0033] Bamboo charcoal fiber has strong adsorption properties, enabling it to absorb moisture and deodorize, as well as possess antibacterial, bacteriostatic, and UV-resistant functions. When bamboo charcoal fiber is soaked in sodium hydroxide solution, the sodium hydroxide erodes the surface of the bamboo charcoal fiber, enlarging the micropores on the surface and giving the surface of the bamboo charcoal fiber a honeycomb structure. Wood powder has strong mechanical properties, bactericidal and disinfecting properties, and insecticidal effects. The wood powder loaded in the porous structure on the surface of the bamboo charcoal fiber increases the mechanical properties of the bamboo charcoal fiber.

[0034] The treated chitosan and treated charcoal fiber are mixed, and the charcoal fiber is loaded on the surface of the chitosan. The chitosan and bamboo charcoal fiber adsorb each other, which further increases the three-dimensional structure of the chitosan, thereby increasing the mechanical properties of the chitosan and its antibacterial properties. In subsequent applications in antibacterial viscose fibers, the mechanical properties, antibacterial properties, and antibacterial durability of the antibacterial viscose fibers are further enhanced.

[0035] Secondly, this application also provides a method for preparing a multifunctional knitted fabric, comprising the following steps:

[0036] (1) Surface layer (1) Yarn preparation: Acrylic fiber, cotton and antibacterial viscose fiber are made into spinning lines by drawing, roving and spinning processes respectively; Inner layer (3) Yarn preparation: Cotton and viscose fiber are made into spinning lines by drawing, roving and spinning processes respectively or acrylic fiber, cotton and antibacterial viscose fiber are made into spinning lines by drawing, roving and spinning processes respectively;

[0037] (2) Sandwich fabric is obtained by knitting with a 24G weft double-sided circular knitting machine;

[0038] (3) Pre-setting: The sandwich fabric prepared in step (2) is pre-set using a Menfa 10-box setting machine;

[0039] (4) Dyeing: Dye the sandwich fabric from step (3) to produce a semi-finished fabric product;

[0040] (5) Pile raising process: The fabric semi-finished product prepared in step (4) is subjected to pile raising process and set aside for later use;

[0041] (6) Shaping: Shaping the sandwich fabric processed in step (5).

[0042] By adopting the above technical solution and the above process, the three-layer fabric has the organizational structure of a lightweight and warm knitted sandwich air layer fabric. The manufacturing process is simple, and the resulting fabric has multiple durable health protection properties such as super warmth and high breathability, excellent moisture absorption and self-heating performance, good antistatic properties, and good antibacterial properties.

[0043] Preferably, the dyeing process uses a reactive dye, which is selected from reactive yellow, reactive red, and reactive blue.

[0044] By adopting the above technical solution and using reactive dyes for dyeing, the process has the advantage of a short flow, which reduces fabric waste, saves time and improves production efficiency. More importantly, it creates a dyeing effect with a deep inner color and a gorgeous, suspended outer layer.

[0045] Preferably, in step (4), the napping process parameters are: 28 curved needle rollers; tension 1.2%; steel needle bending angle 48°; needle cloth density 360 / (inch). 2 Machine speed: 22 m / min; needle cloth roller speed: 75 rpm.

[0046] By adopting the above technical solutions, the purpose of napping is to enhance the softness of the fabric and further increase the air layer content of the fabric, so as to achieve the purpose of light weight and high heat retention of the fabric.

[0047] In summary, this application has the following beneficial effects:

[0048] 1. In this application, the outer layer, inner layer, and elastic threads constitute the organizational structure of the sandwich air layer fabric, making the fabric lightweight and warm. The outer layer and inner layer are connected by elastic threads, giving the fabric elasticity and making it comfortable to wear. A hollow, static air layer is formed between the outer layer and the inner layer, which isolates the body from the opportunity for convection exchange with the external environment. The hollow, static air layer replaces the thermal padding of conventional cotton clothing, providing warmth while being lightweight. At the same time, it can quickly wick away sweat from the body, ensuring that the fabric is cool, breathable, and dry.

[0049] 2. In this application, the surface layer is woven from acrylic, cotton, and antibacterial viscose fiber. Acrylic has good elasticity, a soft feel, and good warmth retention. Cotton has good breathability and comfort. Antibacterial viscose fiber has good antibacterial properties, antistatic properties, good moisture absorption and breathability, a soft feel, good luster, and good dyeing performance. At the same time, antibacterial viscose fiber has good antibacterial durability, which makes the fabric maintain excellent antibacterial durability. The blending of acrylic, cotton, and antibacterial viscose fiber combines the advantages of each component, makes up for the shortcomings of each other, and improves the overall performance of the fabric.

[0050] 3. In this application, the inner layer is woven from a blend of cotton and viscose fiber yarn. Cotton has good moisture absorption, which can absorb the sweat excreted by the human body, ensuring that the clothing is in contact with the skin and makes people feel soft, comfortable and not stiff. Viscose fiber blended yarn has good moisture absorption, is breathable and soft, and is antistatic. The blend of cotton and viscose fiber yarn increases the breathability and antistatic properties of the fabric, increasing the comfort of the wearer. The elastic thread is made of low-temperature spandex. Low-temperature spandex has good shape retention, good elasticity, and high breaking strength. As an elastic thread, it can ensure the structural shape and elasticity of the inner and outer layers, giving the fabric a better structural state. The outer layer, inner layer and elastic thread work together to obtain a multifunctional knitted fabric with good elasticity, good breathability, good antistatic properties, good moisture absorption, good antibacterial properties, and is lightweight and warm. Attached Figure Description

[0051] Figure 1 This is a schematic diagram of the structure of the multifunctional knitted fabric prepared in Example 1 of this application.

[0052] Figure 2 This is the antistatic test report for the multifunctional knitted fabric prepared in Example 1 of this application.

[0053] Figure 3 This is the first page of the test report for the multifunctional knitted fabric prepared in Example 1 of this application.

[0054] Figure 4 This is the second page of the test report for the multifunctional knitted fabric prepared in Example 1 of this application.

[0055] Figure 5 This is a weaving diagram of the multifunctional knitted fabric prepared in Example 1 of this application.

[0056] In the diagram: 1. Top layer; 2. Elastic lines; 3. Inner layer. Detailed Implementation

[0057] The present application will be further described in detail below with reference to the embodiments.

[0058] The raw materials used in the examples and comparative examples are all commercially available.

[0059] Preparation Example 1-1

[0060] The preparation method of antibacterial viscose fiber includes the following steps:

[0061] (1) Grind 1.5 kg of *Sarcandra glabra* extract until the powder particle size is less than 5 μm, then dissolve it in ethanol, sonicate for 3 h, then add 0.3 kg of fatty acid sulfonyl ester, and continue sonicating for 2 h for later use;

[0062] (2) Disperse the modified chitosan in 2L of acetic acid solution with a mass fraction of 3wt%, heat to 85℃, stir thoroughly to dissolve it, and then add activated carbon to obtain a chitosan solution for later use.

[0063] (3) The extract treated in step (1), the chitosan solution obtained in step (2) and 15 kg of viscose fiber spinning solution are mixed, and after high-speed stirring, the mixture is degassed and spun using a wet spinning process. After oiling and drying, the product is obtained. The total draw ratio is 115%, the total spinning speed is 55 m / min, and the coagulation bath temperature is 48℃. The mass ratio of the herb extract, modified chitosan and activated carbon is 1:0.65:0.2.

[0064] The preparation method of *Sarcandra glabra* extract includes the following steps: 2 kg of *Sarcandra glabra* is soaked in water, heated to 70℃, stirred at 55 r / min for 28 min, then 0.7 kg of citric acid and 0.2 kg of 2% cellulase are added, stirred for 25 min, filtered, and the treated *Sarcandra glabra* and filtrate are obtained. Then the treated *Sarcandra glabra* is pulverized, 7 times the volume of ethanol solution and the obtained filtrate are added, heated under reflux for 3 h, concentrated and dried under reduced pressure to obtain *Sarcandra glabra* extract.

[0065] The preparation method of modified chitosan includes the following steps:

[0066] (1) Dissolve 1 kg of chitosan in 2 L of 3% acetic acid solution and stir for 4 h. Then add 0.03 g / L of graphene, stir for 2 h, dry and set aside.

[0067] (2) Disperse 0.5 kg of bamboo charcoal fiber in 1.8 L of sodium hydroxide solution, stir for 2 h, wash with water, then add 0.2 kg of wood powder, sonicate for 20 min, then add chitosan treated in step (1), continue stirring for 7 h, centrifuge and dry to obtain modified chitosan.

[0068] Preparation Examples 1-2

[0069] The difference from Preparation Example 1-1 is that no herb extract was added.

[0070] Preparation Examples 1-3

[0071] The difference from Preparation Example 1-1 is that the *Sarcandra glabra* extract was purchased from Xi'an An'ao Biotechnology Co., Ltd.

[0072] Preparation Examples 1-4

[0073] The difference from Preparation Example 1-1 is that in the preparation method of the coral grass extract, the treated coral grass and filtrate are obtained, and then the treated coral grass is crushed, 7 times the volume of ethanol solution is added, heated under reflux for 3 hours, and concentrated and dried under reduced pressure to obtain the coral grass extract.

[0074] Preparation Examples 1-5

[0075] The difference from Preparation Example 1-1 is that no modified chitosan is added.

[0076] Preparation Examples 1-6

[0077] The difference from Preparation Example 1-1 is that the modified chitosan is replaced with an equal amount of chitosan.

[0078] Preparation Examples 1-7

[0079] The difference from Preparation Example 1-1 is that activated carbon is not added.

[0080] Preparation Examples 1-8

[0081] The difference from Preparation Example 1-1 is that graphene is not added in the preparation method of modified chitosan.

[0082] Preparation Examples 1-9

[0083] The difference from Preparation Example 1-1 is that bamboo charcoal fiber is not added in the preparation method of modified chitosan.

[0084] Preparation Examples 1-10

[0085] The difference from Preparation Example 1-1 is that the mass ratio of Coralgranatum extract, modified chitosan and activated carbon is 1:0.5:0.1.

[0086] Preparation Examples 1-11

[0087] The difference from Preparation Example 1-1 is that the mass ratio of Coralgranatum extract, modified chitosan and activated carbon is 1:0.8:0.3.

[0088] Preparation Examples 1-12

[0089] The difference from Preparation Example 1-1 is that the mass ratio of Coralgranatum extract, modified chitosan and activated carbon is 1:0.12:0.05. Example

[0090] Example 1

[0091] A multifunctional knitted fabric includes an outer layer 1, an inner layer 3, and elastic yarns 2. The outer layer 1 and the inner layer 3 are connected by the elastic yarns 2, and an air layer structure is formed between the outer layer 1 and the inner layer 3.

[0092] The outer layer 1 is woven from a blend of acrylic, cotton, and antibacterial viscose fiber yarn;

[0093] The inner layer 3 is woven from a blend of cotton and viscose fiber yarn;

[0094] Elastic thread 2 is made of low-temperature spandex; the total weight of outer layer 1, inner layer 3 and elastic thread 2 is 100kg;

[0095] In the outer layer 1, the weight percentages of each component are as follows: acrylic fiber 40%, cotton 30%, and antibacterial viscose fiber 30%; in the inner layer 3, the weight percentages of each component are as follows: cotton 50% and viscose fiber 50%.

[0096] The weight percentages of the top layer 1, the inner layer 3, and the elastic thread 2 are as follows: top layer 1 46%, inner layer 3 46%, and elastic thread 28%.

[0097] The manufacturing process of the above-mentioned multifunctional knitted fabric is characterized by including the following steps:

[0098] (1) Surface layer (1) Yarn preparation: Acrylic fiber, cotton and antibacterial viscose fiber are made into spinning lines by drawing, roving and spinning processes respectively; Inner layer (3) Yarn preparation: Cotton and viscose fiber are made into spinning lines by drawing, roving and spinning processes respectively or acrylic fiber, cotton and antibacterial viscose fiber are made into spinning lines by drawing, roving and spinning processes respectively;

[0099] The process parameters for drawing, roving, and spinning are as follows:

[0100] (1) Parallelism: Dried strips, quantification: 16g / 5m

[0101] Front roller speed 290m / min

[0102] Combined number 8 per eye

[0103] Total traction ratio 8 times

[0104] Draft ratio allocation: 1.37

[0105] (2) Corrugated yarn: Front roller speed 200 r / min

[0106] Spindle speed 800-900 r / min

[0107] Rear zone draw ratio 1.3

[0108] Twist coefficient 85

[0109] (3) Fine yarn: Front roller forward punch 2m

[0110] Twist coefficient 320

[0111] (2) The sandwich fabric was woven using a 24G weft knitting double-sided circular knitting machine. The weaving parameters were: cylinder diameter 170 cm and rotation speed 23 rpm.

[0112] Weaving method: 6-way cycle, 1st and 4th tracts into 30D low-temperature spandex, 2nd and 5th tracts into inner layer (3) yarn, 3rd and 6th tracts into outer layer (1) yarn + low-temperature spandex, weaving method diagram as follows Figure 5 ;

[0113] (3) Pre-setting: The sandwich fabric prepared in step (2) was pre-set using a Menfushi 10-box setting machine. The setting temperature was 175℃, the upper overfeed was 42%, the lower overfeed was 6.5%, and the fabric speed was 13m / min.

[0114] (4) Dyeing: Dye the sandwich fabric treated in step (3) with a liquor ratio of 1:12, a dyeing temperature of 60℃ and a dyeing time of 60min to produce a semi-finished fabric.

[0115] (5) Pile raising process: The fabric semi-finished product prepared in step (4) is subjected to pile raising process for later use; the pile raising process parameters are: 28 rollers for the curved needle; tension 1.2%; bending angle of the steel needle 48°; needle cloth density 360 / (inch) 2 Machine speed: 22 m / min; needle cloth roller speed: 75 rpm;

[0116] (6) Setting: The sandwich fabric processed in step (5) is set; a Menfus 10-box setting machine is used, setting temperature: 135℃, upper overfeed 48%, lower overfeed 8.0%, fabric speed: 14m / min.

[0117] The fabric is dyed with reactive dyes, which are selected from reactive blue.

[0118] The antibacterial viscose fiber was purchased from Hebei Jigao Chemical Fiber Co., Ltd. or Sateri (China) Fiber Co., Ltd.; the test report for the multifunctional knitted fabric produced in this embodiment can be found in [link to test report]. Figure 2-4 A schematic diagram of the structure of the multifunctional knitted fabric produced in this embodiment is shown below. Figure 1 .

[0119] Example 2

[0120] A multifunctional knitted fabric, which differs from Example 1 in that,

[0121] In the outer layer 1, the weight percentages of each component are as follows: acrylic fiber 35%, cotton 35%, and antibacterial viscose fiber 30%; in the inner layer 3, the weight percentages of each component are as follows: cotton 45% and viscose fiber 55%.

[0122] The weight percentages of the top layer 1, the inner layer 3, and the elastic thread 2 are as follows: top layer 1 41%, inner layer 3 51%, and elastic thread 28%.

[0123] Example 3

[0124] A multifunctional knitted fabric, which differs from Example 1 in that,

[0125] In the outer layer 1, the weight percentages of each component are as follows: acrylic fiber 45%, cotton 25%, and antibacterial viscose fiber 30%; in the inner layer 3, the weight percentages of each component are as follows: cotton 55% and viscose fiber 45%.

[0126] The weight percentages of the top layer 1, the inner layer 3, and the elastic thread 2 are as follows: top layer 1 51%, inner layer 3 41%, and elastic thread 28%.

[0127] Example 4

[0128] A multifunctional knitted fabric, which differs from Example 1 in that the antibacterial viscose fiber is prepared using Preparation Example 1-1.

[0129] Example 5

[0130] A multifunctional knitted fabric, which differs from Example 4 in that the antibacterial viscose fiber is prepared using Preparation Examples 1-2.

[0131] Example 6

[0132] A multifunctional knitted fabric, which differs from Example 4 in that the antibacterial viscose fiber is prepared using Preparation Examples 1-3.

[0133] Example 7

[0134] A multifunctional knitted fabric, which differs from Example 4 in that the antibacterial viscose fiber is prepared using Preparation Examples 1-4.

[0135] Example 8

[0136] A multifunctional knitted fabric, which differs from Example 4 in that the antibacterial viscose fiber is prepared using Preparation Examples 1-5.

[0137] Example 9

[0138] A multifunctional knitted fabric, which differs from Example 4 in that the antibacterial viscose fiber is prepared using Preparation Examples 1-6.

[0139] Example 10

[0140] A multifunctional knitted fabric, which differs from Example 4 in that the antibacterial viscose fiber is prepared using Preparation Examples 1-7.

[0141] Example 11

[0142] A multifunctional knitted fabric, which differs from Example 4 in that the antibacterial viscose fiber is prepared using Preparation Examples 1-8.

[0143] Example 12

[0144] A multifunctional knitted fabric, which differs from Example 4 in that the antibacterial viscose fiber is prepared using Preparation Examples 1-9.

[0145] Example 13

[0146] A multifunctional knitted fabric, which differs from Example 4 in that the antibacterial viscose fiber is prepared using Preparation Examples 1-10.

[0147] Example 14

[0148] A multifunctional knitted fabric, which differs from Example 4 in that the antibacterial viscose fiber is prepared using Preparation Examples 1-11.

[0149] Example 15

[0150] A multifunctional knitted fabric, which differs from Example 4 in that the antibacterial viscose fiber is prepared using Preparation Examples 1-12.

[0151] Example 16

[0152] A multifunctional knitted fabric, which differs from Example 1 in that the weight percentages of each component in the outer layer 1 are: 25% acrylic fiber, 45% cotton, and 30% antibacterial viscose fiber; and the weight percentages of each component in the inner layer 3 are: 40% cotton and 60% viscose fiber.

[0153] Example 17

[0154] A multifunctional knitted fabric, which differs from Example 1 in that, in the outer layer 1, the weight percentages of each component are: 55% acrylic fiber, 15% cotton, and 30% antibacterial viscose fiber; and in the inner layer 3, the weight percentages of each component are: 60% cotton and 40% viscose fiber.

[0155] Example 18

[0156] A multifunctional knitted fabric, which differs from Example 1 in that the weight percentages of the outer layer 1, inner layer 3, and elastic yarn 2 are respectively: outer layer 1 30%, inner layer 3 60%, and elastic yarn 2 10%.

[0157] Example 19

[0158] A multifunctional knitted fabric, which differs from Example 1 in that the weight percentages of the outer layer 1, inner layer 3, and elastic thread 2 are respectively: outer layer 1 60%, inner layer 3 30%, and elastic thread 2 10%.

[0159] Example 20

[0160] A multifunctional knitted fabric, which differs from Example 1 in that the inner layer 3 is woven from a blend of acrylic, cotton and antibacterial viscose fiber yarn, wherein the acrylic is 35%, cotton is 25% and antibacterial viscose fiber is 25%.

[0161] Example 21

[0162] A multifunctional knitted fabric, which differs from Example 1 in that the inner layer 3 is woven from a blend of acrylic, cotton and antibacterial viscose fiber yarn, wherein the acrylic is 45%, cotton is 35% and antibacterial viscose fiber is 35%.

[0163] Comparative Example 1

[0164] A multifunctional knitted fabric, which differs from Example 1 in that the antibacterial viscose fiber in the surface layer 1 is replaced by an equal amount of viscose fiber blended yarn.

[0165] Comparative Example 2

[0166] A multifunctional knitted fabric, which differs from Example 1 in that the outer layer 1 and the inner layer 3 are connected by a polyolefin composite adhesive.

[0167] The mechanical and antibacterial properties of the multifunctional knitted fabrics prepared in Examples 1-21 and Comparative Examples 1-2 were tested.

[0168] Fabric breathability: The fabric breathability is tested according to GB / T 5453-1997 "Textiles - Determination of air permeability of fabrics", and the test results are expressed as air permeability rate.

[0169] Antibacterial properties test: The test was conducted according to the national standard GB / T20944.3-2008 "Evaluation of antibacterial properties of textiles - Part 3: Vibration method". The test strains were Staphylococcus aureus, Candida albicans and Escherichia coli. The multifunctional fabric was washed and tested again. The washing method was carried out on a washing fastness tester. The washing conditions were: 3 g / L of detergent, liquor ratio (mass ratio of fabric to detergent liquid of 1:45), temperature of 35℃, and time of 8 min for one wash. The results are shown in Table 1.

[0170] Table 1 Test data for the examples and comparative examples

[0171]

[0172] As can be seen from Table 1, the multifunctional knitted fabrics prepared in Examples 1-3 and 20-21 of this application have good breathability, with a breathability rate of 257 mm / s. They also have good antibacterial properties and antibacterial durability. The initial inhibition rate against Escherichia coli, Candida albicans, and Staphylococcus aureus is about 99%, and after 50 washes, the inhibition rate against Escherichia coli, Candida albicans, and Staphylococcus aureus is about 96%. This indicates that the prepared multifunctional knitted fabric has superior tensile properties, breathability, antibacterial properties, and antibacterial durability. The prepared sandwich air layer fabric has a lightweight and warm effect.

[0173] Among them, the bursting strength of the multifunctional knitted fabric prepared in Example 1 was tested. The bursting strength test was conducted according to the national standard GB / T 19976-2005 Textiles. The bursting strength of Example 1 was 480N, indicating that the fabric prepared in Example 1 has good mechanical properties and high durability when deformed and broken under external pressure.

[0174] Example 4 shows that the antibacterial viscose fiber was prepared using the method of this application, while the antibacterial viscose fibers of Examples 1-3 were commercially available. Compared with Example 1, the air permeability was 263 mm / s, and the initial antibacterial rate against Escherichia coli, Candida albicans, and Staphylococcus aureus was approximately 99.99%. After 60 washes, the antibacterial rate against Escherichia coli, Candida albicans, and Staphylococcus aureus was approximately 99.12%. This indicates that the antibacterial viscose fiber prepared in this application has better mechanical properties, antibacterial properties, and antibacterial durability.

[0175] Example 5: Antibacterial adhesive fiber without adding *Coralaria pubescens* extract; Example 6: *Coralaria pubescens* extract from commercially available sources; Example 7: Modified preparation method of *Coralaria pubescens* extract. As shown in Table 1, the breathability of the fabric without *Coralaria pubescens* extract decreased slightly, but the antibacterial properties and antibacterial durability decreased significantly. The test data using commercially available *Coralaria pubescens* extract also showed that its performance was somewhat worse than that of this application. Modified preparation method of *Coralaria pubescens* extract from this application also resulted in test data that were worse than those of Example 4. This indicates that the fabric obtained using the *Coralaria pubescens* manufacturing process of this application has excellent performance in subsequent related performance tests.

[0176] Example 8: Antibacterial adhesive fiber without modified chitosan; Example 10: Antibacterial adhesive fiber without activated carbon; Example 9: Modified chitosan replaced with chitosan. As shown in Table 1, the breathability, antibacterial properties, and antibacterial durability of the fabric without modified chitosan or activated carbon are significantly reduced. The properties of the fabric with modified chitosan replaced with chitosan are also slightly reduced. This indicates that the modified chitosan prepared in this application has excellent breathability, antibacterial properties, and antibacterial durability, and will have good performance when applied to fabrics.

[0177] In Example 11, no graphene was added in the preparation method of modified chitosan. In Example 12, no bamboo charcoal fiber was added in the preparation method of modified chitosan. As shown in Table 1, the breathability, antibacterial properties, and antibacterial durability of the fabric decreased significantly. This indicates that graphene or bamboo charcoal fiber affects the breathability and antibacterial properties of modified chitosan, thereby affecting the relevant properties of the fabric. In Example 15, the mass ratio of *Sarcandra glabra* extract, modified chitosan, and activated carbon was changed. As shown in Table 1, the performance data of the fabric in all aspects were better than those of Examples 8 and 10, and comparable to those of Example 5, but worse than those of Examples 4 and 13-14. This indicates that *Sarcandra glabra* extract, modified chitosan, and activated carbon have a good synergistic effect, mutually promoting and improving the various properties of the subsequent fabric.

[0178] Examples 16-19 respectively changed the dosage ratio of each component in the outer layer and the inner layer, as well as the weight percentage of the inner layer and elastic thread. As shown in Table 1, compared with Examples 1-3, the various properties of the prepared fabric decreased, indicating that the content of each component within a certain ratio has a better effect, resulting in a fabric with long-lasting antibacterial properties.

[0179] In Comparative Example 1, the antibacterial viscose fiber blended yarn was replaced by viscose fiber blended yarn. As shown in Table 1, the antibacterial properties and antibacterial durability of the fabric were greatly reduced, indicating that the antibacterial viscose fiber prepared in this application has excellent antibacterial properties and antibacterial durability. In Comparative Example 2, the outer layer and inner layer are connected by an adhesive, and the two layers are tightly connected. The fabric prepared has poor antibacterial properties and breathability compared to Example 1 of this application. Moreover, the fabric is heavier than that of this application and cannot achieve the effect of being lightweight.

[0180] 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. A multifunctional knitted fabric, characterized in that, It includes a surface layer (1), elastic cords (2) and an inner layer (3), wherein the surface layer (1) and the inner layer (3) are connected by elastic cords (2), and an air layer structure is formed between the surface layer (1) and the inner layer (3); The surface layer (1) is woven from a blend of acrylic, cotton, and antibacterial viscose fiber yarn; The inner layer (3) is woven from cotton and viscose fiber blended yarn or from acrylic, cotton and antibacterial viscose fiber blended yarn; The elastic thread (2) is low-temperature spandex; The method for preparing the antibacterial viscose fiber includes the following steps: (1) Grind the extract of Coralgranatum into powder with a particle size of less than 5 μm, then dissolve it in ethanol, sonicate it, add fatty acid sulfonyl ester, continue sonicating, and set aside. (2) Disperse the modified chitosan in an acetic acid solution, heat it to 80-90℃, stir it thoroughly to dissolve it, and then add activated carbon to obtain a chitosan solution for later use; (3) The extract treated in step (1), the chitosan solution obtained in step (2) and the viscose fiber spinning solution are mixed, and the mixture is degassed after high-speed stirring. The mixture is then spun using a wet spinning process and dried after oiling. The total draw ratio is 110-120%, the total spinning speed is 50-60 m / min, and the coagulation bath temperature is 45-50℃. The preparation method of the *Sarcandra glabra* extract includes the following steps: soaking *Sarcandra glabra* in water, heating to 65-75℃, stirring at 50-60 r / min for 25-30 min, then adding citric acid and cellulase, stirring for 20-30 min, filtering to obtain the treated *Sarcandra glabra* and filtrate, then pulverizing the treated *Sarcandra glabra*, adding ethanol solution and the filtrate, heating under reflux for 2-3 h, concentrating under reduced pressure and drying to obtain the *Sarcandra glabra* extract; The method for preparing the modified chitosan includes the following steps: (1) Dissolve chitosan in acetic acid solution and stir for 3-5 hours. Then add 0.01-0.5 g / L of graphene, stir for 1-3 hours, dry, and set aside. (2) Disperse bamboo charcoal fiber in sodium hydroxide solution, stir for 1-2 hours, wash with water, then add wood powder, sonicate for 10-30 minutes, then add chitosan treated in step (1), continue stirring for 5-8 hours, centrifuge and dry to obtain modified chitosan.

2. The multifunctional knitted fabric according to claim 1, characterized in that, The outer layer (1) contains the following components by weight percentage: 35-45% acrylic fiber, 25-35% cotton, and 25-35% antibacterial viscose fiber; the inner layer (3) contains the following components by weight percentage: 45-55% cotton and 45-55% viscose fiber; or 35-45% acrylic fiber, 25-35% cotton, and 25-35% antibacterial viscose fiber.

3. A multifunctional knitted fabric according to claim 1, characterized in that, The weight percentages of the surface layer (1), inner layer (3), and elastic thread (2) are as follows: surface layer (1) 41-51%, inner layer (3) 41-51%, and elastic thread (2) 3-13%.

4. The multifunctional knitted fabric according to claim 1, characterized in that, The mass ratio of the herb extract, modified chitosan, and activated carbon is 1:0.5-0.8:0.1-0.

3.

5. The manufacturing process of a multifunctional knitted fabric according to any one of claims 1-4, characterized in that, Includes the following steps: (1) Surface layer (1) Yarn preparation: Acrylic fiber, cotton and antibacterial viscose fiber are made into spinning lines by drawing, roving and spinning processes respectively; Inner layer (3) Yarn preparation: Cotton and viscose fiber are made into spinning lines by drawing, roving and spinning processes respectively or acrylic fiber, cotton and antibacterial viscose fiber are made into spinning lines by drawing, roving and spinning processes respectively; (2) Sandwich fabric is obtained by knitting with a 24G weft double-sided circular knitting machine; (3) Pre-setting: The sandwich fabric prepared in step (2) is pre-set using a Menfa 10-box setting machine; (4) Dyeing: Dye the sandwich fabric from step (3) to produce a semi-finished fabric product; (5) Pile raising process: The fabric semi-finished product prepared in step (4) is subjected to pile raising process and set aside for later use; (6) Shaping: Shaping the sandwich fabric processed in step (5).

6. The manufacturing process of a multifunctional knitted fabric according to claim 5, characterized in that, The dyeing process uses reactive dyes, which are selected from reactive yellow, reactive red, and reactive blue.

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