Flame-retardant anti-static comfortable knitted fabric and preparation method thereof

Abstract

The invention relates to the technical field of textile, in particular to a flame-retardant anti-static comfortable knitted fabric and a preparation method thereof.The preparation method includes the steps that aramid yarn and conductive filaments are woven in a double-face knitting mode to obtain the knitted fabric, the conductive filaments serve as an inner layer, and the aramid yarn serves as an outer layer; the base material of the conductive filaments is regenerated cellulose fiber filaments. Knitted weave is adopted as the weave structure of the fabric, the fabric is soft and elastic, the inner layer regenerated cellulose fiber filaments and conductive fibers improve the wearing comfort, sweat can be rapidly guided away, the breathability and moisture penetrability are good, and the fabric is not sticky to skin and not greasy; the outer layer is made of aramid fiber fabric, has good flame retardance and high strength, and can well play a role of working clothes in a working environment when being combined with the conductive filaments. The anti-static performance, the comfort performance, the protection performance and the like are greatly improved, and the production efficiency is greatly improved by adopting a two-sided knitting method.

Description

Technical Field

[0001] This invention relates to a flame-retardant, anti-static, and comfortable knitted fabric and its preparation method, belonging to the field of textile technology. Background Technology

[0002] One important application area for protective clothing is outdoor work, where winter and summer are two particularly harsh seasons, posing significant challenges. Winter protective clothing can improve warmth and comfort through various insulating materials such as down, silk floss, hollow fibers, and heating devices, resulting in numerous research studies and patents. In contrast, summer protective clothing is more difficult to develop, and current summer workwear is mostly woven, typically weighing around 160g / m². 2 In summer, it is not comfortable to wear, it is stuffy and not breathable, and it has poor moisture absorption and quick-drying properties, making it unable to quickly wick away sweat and heat.

[0003] Utility model patent CN220947043U discloses a comfortable, multifunctional flame-retardant and antistatic protective fabric, comprising a high-strength flame-retardant layer, a flame-retardant and antistatic layer, and an antibacterial and comfortable layer. These three layers are connected by yarns to form a composite fabric, offering flame-retardant, antistatic, and comfortable functions. However, its complex structure makes it thick and stuffy for summer wear, unsuitable for long-term workwear. Patent application CN116288873A discloses a comfortable flame-retardant and antistatic fabric and its preparation method, woven from warp and weft yarns and conductive yarns according to a specific floating / sinking pattern. A sun-drying agent is added during the finishing process to address issues such as the lack of durability of flame-retardant functions in cotton fabrics, poor comfort and limited functionality in aramid fabrics, as well as limitations in dyeing and poor colorfastness under sunlight. This patent primarily improves the fabric's performance during the spinning and finishing stages to give it the corresponding functions. However, the machine-woven method is inefficient and has low elasticity, making it unsuitable for the lightweight and soft characteristics of summer clothing. Summary of the Invention

[0004] This invention addresses the shortcomings of existing technologies by providing a flame-retardant, antistatic, and comfortable knitted fabric and its preparation method. The knitted fabric exhibits significant improvements in antistatic properties, comfort, and protective performance. Furthermore, the double-sided knitting method greatly enhances production efficiency.

[0005] The technical solution of this invention to solve the above-mentioned technical problems is as follows: A method for preparing a flame-retardant, antistatic, and comfortable knitted fabric, wherein the preparation method is as follows: The knitted fabric is obtained by using a double-sided knitting method with aramid yarn and conductive filament, wherein the conductive filament is the inner layer and the aramid yarn is the outer layer; The matrix material of the conductive filament is regenerated cellulose fiber filament.

[0006] Furthermore, the difference in fineness between the aramid yarn and the conductive filament does not exceed 5 s / 1.

[0007] Furthermore, the aramid yarn is a 50s / 1-80s / 1 yarn, the main body of the aramid yarn is made of aramid short fibers, and the twist is 300-450 twists / m; the aramid yarn contains or does not contain 5%-10% by mass of para-aramid short fibers and / or 10%-40% by mass of flame-retardant regenerated cellulose fibers. The denier of the aramid short fiber is 1-2D, and the length of the aramid short fiber is 38mm-51mm.

[0008] Furthermore, the conductive filament is formed by plying conductive fibers and regenerated cellulose fibers, with a ply ratio of conductive fibers to regenerated cellulose fibers of 1:(5-20), and the conductive fibers account for 2%-10% of the mass of the knitted fabric; The twist of the conductive filament is 50-150 twists / m.

[0009] Furthermore, the conductive filament is located inside the braiding device, while the aramid yarn is located outside the braiding device. During the braiding process, the conductive filament is cross-braided with the outer aramid yarn every 3-15 stitches, and 1-3 yarns are hooked at the same time.

[0010] Furthermore, the elongation of the aramid yarn is 10%-30%, and the ratio of the weaving speed to the yarn output speed of the aramid yarn is (1.05-1.15):1.

[0011] Furthermore, the elongation of the conductive filament is 8%-15%, and the ratio of the braiding speed of the conductive filament to the filament delivery speed is 1:(1.2-1.3).

[0012] Furthermore, during the weaving process, a yarn feeder is used to feed in conductive filaments. The yarn feeder consists of a tension sensor, a yarn guide nozzle, a yarn controller, a yarn fixing frame, and a motor. The yarn bobbin is fixed on the yarn frame, and the motor drives the yarn frame to rotate, thus guiding the yarn out according to the weaving speed. A waxing device is added to the front end of the yarn guide nozzle.

[0013] Furthermore, if the elongation of the conductive filament is *a* and the elongation of the aramid yarn is *b*, then the tension of the conductive filament is... N; When weaving fabric, the ratio of the feeding speed of the aramid yarn to the feeding speed of the conductive filament is 1: (0.9b / a ~ 1.1b / a).

[0014] The present invention also discloses a flame-retardant, antistatic, and comfortable knitted fabric, which is prepared by the preparation method described in the present invention.

[0015] Furthermore, the weight of the knitted fabric is 100-160 g / m². 2 The weight of the conductive filament accounts for 1%-10% of the total weight of the knitted fabric.

[0016] The beneficial effects of this invention are: This invention utilizes a knitted structure as the fabric for summer comfort, resulting in a soft and elastic material. As a workwear fabric, the inner layer incorporates regenerated cellulose fiber filaments and conductive filaments, enhancing wearing comfort and quickly wicking away sweat. The regenerated cellulose fiber filaments have a moisture regain of 11%-13%, a smooth surface, and excellent moisture-wicking properties due to capillary action, preventing skin stickiness and greasiness. The outer layer uses aramid fabric, which possesses good flame retardancy and high strength. Combined with the conductive filaments, it effectively fulfills its function as workwear in the workplace. Significant improvements are achieved in antistatic properties, comfort, and protective performance. Furthermore, the double-knitting method greatly increases production efficiency.

[0017] The flame-retardant, anti-static, and comfortable knitted fabric of this invention features an aramid fiber-based outer layer with inherent flame-retardant properties. It is a key raw material for flame-retardant protective clothing. Its advantages include immediate self-extinguishing upon removal from a flame, with no smoldering or afterflame. Its strength and durability surpass those of ordinary clothing fabrics and fibers. Other properties make it suitable for workwear, and it can withstand multiple washes and prolonged wear without deformation, shrinkage, or damage. The inner layer contains micro-elastic conductive filaments that are comfortable and smooth. The regenerated cellulose fiber filaments quickly wick away sweat and heat, keeping the skin dry in high-temperature environments.

[0018] The preparation method described in this invention is a one-step knitting process, not a simple double-layer stacking as in the traditional sense. The advantage of this knitting method is that the yarn used does not require the previous heddle and reed threading steps, greatly improving the weaving process and speed. Simultaneously, the outer and inner layers are knitted together, increasing production efficiency. Then, the two layers are linked together by intermittently hooking the outer layer yarn with the inner layer yarn. By appropriately adjusting the spacing of the connection points, regular or irregular pores are formed, which not only improves the appearance but also creates breathable and moisture-permeable points, enhancing both appearance and wearing comfort.

[0019] In the preparation method of the flame-retardant, antistatic, and comfortable knitted fabric described in this invention, the appropriate selection of raw materials and the active synergy of knitting conditions can minimize the problem of snagging during the knitting process, avoid the generation of excessive small fuzz, and ensure that the knitted fabric surface is flat. As a result, the final knitted fabric has excellent thermal protection performance, breathability, moisture permeability, electrical conductivity, and strength performance, while also having excellent wearing comfort. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the knitting route of the knitted fabric of the present invention. Detailed Implementation

[0021] The specific embodiments of the present invention will be described in detail below. The present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used is for describing particular embodiments only and is not intended to limit the invention.

[0023] A method for preparing a flame-retardant, antistatic, and comfortable knitted fabric, wherein the preparation method comprises: The knitted fabric is obtained by using a double-sided knitting method with aramid yarn and conductive filament, wherein the conductive filament is the inner layer and the aramid yarn is the outer layer; The matrix material of the conductive filament is regenerated cellulose fiber filament.

[0024] Regenerated cellulose fiber is currently the most widely used chemical fiber in apparel fabrics. It has good softness and wearing comfort, excellent color fastness, physical properties, quick-drying properties, and chemical properties, and is reasonably priced. Combining the two can reduce the overall price of clothing.

[0025] Furthermore, the difference in fineness between the aramid yarn and the conductive filament does not exceed 5 s / 1.

[0026] Furthermore, the aramid yarn is a 50s / 1-80s / 1 yarn, the main body of the aramid yarn is made of aramid short fibers, and the twist is 300-450 twists / m; the aramid yarn may or may not contain 5%-10% by mass of para-aramid short fibers and / or 10%-40% by mass of flame-retardant regenerated cellulose fibers to improve its strength or comfort; The denier of the aramid short fiber is 1-2D, and the length of the aramid short fiber is 38mm-51mm.

[0027] Furthermore, the outer yarn can be one or more of meta-aramid, para-aramid, and flame-retardant regenerated cellulose. Meta-aramid fiber is an inherently flame-retardant fiber that retains good flame retardancy and strength even after multiple washes. It can withstand more than 200 industrial washes without any degradation in performance or damage to appearance, making it an ideal workwear fabric.

[0028] Furthermore, the conductive filament is formed by plying conductive fibers and regenerated cellulose fibers, with a ply ratio of conductive fibers to regenerated cellulose fibers of 1:(5-20), and the conductive fibers account for 1%-10% of the mass of the knitted fabric; The twist of the conductive filament is 50-150 twists / m.

[0029] Preferably, the fineness of the conductive filament is the same as that of the aramid yarn, and the fineness and elongation of the conductive fiber and the regenerated cellulose fiber filament are consistent, reducing unevenness during the weaving and wearing process.

[0030] Furthermore, the knitted fabric is double-layered, with conductive filaments as the inner layer, using a plain weave structure, which is simple in structure, fast in weaving, and lightweight. The outer layer is made of aramid yarn, and the weave structure is not limited and can be arranged as needed. Alternatively, the inner layer can use a plain weave structure, and the outer layer can use a rib weave structure.

[0031] Furthermore, the weaving equipment is a double-sided circular knitting machine or a flat knitting machine, and the program is set according to the requirements for automatic weaving.

[0032] Furthermore, the conductive filament is located on the inner side of the weaving device, while the aramid yarn is located on the outer side. During the weaving process, the conductive filament crosses with the outer aramid yarn every 3-15 stitches, hooking 1-3 yarns at the same time, thus forming tiny pores on the fabric surface and linking the two types of yarns or filaments together. Figure 1 The weaving is done in a certain way, and the first to third columns can be arranged freely as needed. The value of n is 0 to 3, which is determined by the required mesh size.

[0033] The position and distance of the interlacing can be set according to the fabric performance and appearance requirements. Patterns can be formed by the position and distance of the interlacing. Tiny air gaps are formed between the inner and outer layers of the structure that are not interlaced. In the event of heat hazard, a heat insulation layer can be effectively formed to isolate the body from the harm of high heat.

[0034] Furthermore, the elongation of the aramid yarn is 10%-30%, and the ratio of the weaving speed to the yarn output speed of the aramid yarn is (1.05-1.15):1 to ensure a smooth fabric surface.

[0035] Furthermore, the elongation of the conductive filament is 8%-15%, and the ratio of the weaving speed to the filament delivery speed is 1:(1.2-1.3). The longitudinal depth of the needles for the conductive filament is appropriately increased to prevent the conductive filament from breaking due to stretching of the knitted fabric during use.

[0036] Furthermore, conductive filaments are prone to fraying during the weaving process, resulting in small fuzz on the filament surface; and the elongation rate of the inner and outer yarns differs significantly. Therefore, during the weaving process, a yarn feeder is used to feed the conductive filaments. The yarn feeder consists of a tension sensor, a yarn guide nozzle, a yarn controller, a yarn fixing frame, and a motor. The yarn bobbin is fixed on the yarn frame, and the motor drives the yarn frame to rotate, guiding the yarn according to the weaving speed. A waxing device is added to the front end of the yarn guide nozzle to increase the smoothness of the filaments.

[0037] Furthermore, if the elongation of the conductive filament is *a* and the elongation of the aramid yarn is *b*, then the tension of the conductive filament is... N; When weaving fabric, the ratio of the feeding speed of the aramid yarn to the feeding speed of the conductive filament is 1: (0.9b / a ~ 1.1b / a).

[0038] Preferably, the elongation of the conductive filament is a, and the elongation of the aramid yarn is b, then the tension of the conductive filament is... N; When weaving fabric, the ratio of the feeding speed of the aramid yarn to the feeding speed of the conductive filament is 1:b / a to ensure that the inner and outer layers are smooth and flat.

[0039] The present invention also discloses a flame-retardant, antistatic, and comfortable knitted fabric, which is prepared by the preparation method described in the present invention.

[0040] Furthermore, the weight of the knitted fabric is 100-160 g / m². 2 The weight of the conductive filament accounts for 1%-10% of the total weight of the knitted fabric.

[0041] The knitted fabric is soft and comfortable overall, with an inner layer that is moisture-wicking, sweat-wicking, and anti-static, and an outer layer that is flame-retardant and sweat-wicking. The tiny gaps created during the knitting process help dissipate heat and improve coolness. Furthermore, the fabric has dual protection functions of anti-static and flame-retardant properties, making it suitable for workplace use. It quickly conducts away airborne electrical charges, reducing charge buildup and minimizing the risk of flashover.

[0042] The flame-retardant, antistatic, and comfortable knitted fabric of this invention is used in antistatic clothing and gloves used in environments requiring flame retardancy and antistatic properties.

[0043] The relevant raw materials used in the embodiments of the present invention are as follows: Conductive filament: The matrix is ​​nylon-based, and the outer coating is carbon or other metal materials, giving the fiber conductive properties. The elongation and bending properties of the fiber are basically consistent with those of regenerated cellulose fiber filaments, reducing the difficulties in the weaving process and the uneven appearance caused by uneven tension. The conductive filament used in this embodiment of the invention is model 'BELLTRON' CONDUCTIVE FILAMENT YARN 22T-3-9R1K NYLON TYPE BLACK. The regenerated cellulose fiber filaments are purchased commercially, and their performance only needs to meet the requirements.

[0044] Regenerated cellulose fiber: The regenerated cellulose fiber uses flame-retardant lyocell or flame-retardant modal fiber. The length of the short fiber (flame-retardant regenerated cellulose fiber) is consistent with that of the meta-aramid fiber to ensure a smooth spinning process and adapt to the spacing of each process. The regenerated cellulose fiber filament used in this embodiment of the invention is: flame-retardant modal fiber, model LENZING. TM FRBlack dull spundyed.

[0045] The meta-aramid and para-aramid fibers used are the Taimeda and Taipron series produced by Taihe New Materials Group Co., Ltd.

[0046] The use of the above-mentioned raw materials does not constitute a limitation on the present invention.

[0047] Example 1 Preparation of a flame-retardant, antistatic, and comfortable knitted fabric: According to the raw materials in Table 1, the outer layer material is formed into knitting yarn, and then according to... Figure 1 The outer and inner layers are knitted using a double-sided circular knitting machine or a flat knitting machine, forming the protective fabric in one step. The structure is a plain knit, with 8 stitches crossing between the inner and outer layers.

[0048] The specific raw material details are shown in Table 1 below.

[0049] Table 1 Raw material list for Example 1 Example 2 Preparation of a flame-retardant, antistatic, and comfortable knitted fabric: According to the raw materials in Table 2, the outer layer material is spun into knitting yarn through compact spinning, and then... Figure 1 The outer and inner layers are knitted using a double-sided circular knitting machine in a single process to obtain the protective fabric. The fabric has a plain knit structure. The number of stitches crossing between the inner and outer layers is 5.

[0050] The specific details of the raw materials are shown in Table 2 below.

[0051] Table 2 Raw material list for Example 2 Example 3 Preparation of a flame-retardant, antistatic, and comfortable knitted fabric: According to the raw materials in Table 3, the outer layer material is spun into knitting yarn through compact spinning, and then... Figure 1 The outer and inner layers are woven using a double-sided circular knitting machine, forming the protective fabric in one step. The fabric structure is a plain knit.

[0052] The specific raw material details are shown in Table 3 below. The number of stitches crossing the inner and outer layers is 10.

[0053] Table 3 Raw material list for Example 3 Example 4 Preparation of a flame-retardant, antistatic, and comfortable knitted fabric: According to the raw materials in Table 4, the outer layer material is spun into knitting yarn through compact spinning, and then... Figure 1 The outer and inner layers are knitted using a double-sided circular knitting machine in a single process to obtain the protective fabric. The fabric has a plain knit structure. The number of stitches crossing between the inner and outer layers is 5.

[0054] The specific details of the raw materials are shown in Table 4 below.

[0055] Table 4 Raw material list for Example 4 Example 5 Preparation of a flame-retardant, antistatic, and comfortable knitted fabric: According to the raw materials in Table 5, the outer layer material is spun into knitting yarn through compact spinning, and then... Figure 1 The outer and inner layers are knitted using a double-sided circular knitting machine in a single process to obtain the protective fabric. The fabric structure is a plain knit. The number of stitches crossing between the inner and outer layers is 8.

[0056] The specific raw material details are shown in Table 5 below.

[0057] Table 5. Raw material list for Example 5 Example 6 Preparation of a flame-retardant, antistatic, and comfortable knitted fabric: According to the raw materials in Table 6, the outer layer material is spun into knitting yarn through compact spinning, and then... Figure 1 The outer and inner layers are knitted using a double-sided circular knitting machine in a single process to obtain the protective fabric. The fabric has a plain knit structure. The number of stitches crossing between the inner and outer layers is 5.

[0058] The specific raw material details are shown in Table 6 below.

[0059] Table 6 Raw material list for Example 6 Example 7 Preparation of a flame-retardant, antistatic, and comfortable knitted fabric: According to the raw materials in Table 7, the outer layer material is spun into knitting yarn through compact spinning, and then... Figure 1 The outer and inner layers are knitted using a double-sided circular knitting machine in a single process to obtain the protective fabric. The fabric structure is a plain knit. The number of stitches crossing between the inner and outer layers is 8.

[0060] The specific details of the raw materials are shown in Table 7 below.

[0061] Table 7 Raw material list for Example 7 Example 8 Preparation of a flame-retardant, antistatic, and comfortable knitted fabric: According to the raw materials in Table 8, the outer layer material is spun into knitting yarn through compact spinning, and then... Figure 1 The outer, middle, and inner layers are knitted using a double-sided circular knitting machine in a single process to obtain the protective fabric. The fabric structure is a knitted rib. The number of stitches crossing between the inner and outer layers is 8.

[0062] The specific raw material details are shown in Table 8 below.

[0063] Table 8 Raw material list for Example 8 Comparative Example 1 The fabric was prepared using the same method as in Example 1, except that conductive filaments were not added.

[0064] Comparative Example 2 The fabric used is a standard summer garment material, composed of 60% aramid fiber (51mm in length, 1.5D fineness, dyed indigo) and 40% flame-retardant regenerated cellulose (38mm in length, 1.5D fineness, dyed indigo). The yarn count is 40s / 2, the weave is plain knit, and the weight is 150g / m². 2 .

[0065] Comparative Example 3 The fabric was prepared using the same method as in Example 1, except that the tension of the inner conductive filament in Comparative Example 3 was 0.82 (not included in Example 1). (within the range of N).

[0066] Comparative Example 4 The fabric was prepared using the same method as in Example 1, except that the ratio of the feeding speed of the aramid yarn to the conductive filament in Comparative Example 4 was 1:1.5 (not within the range of 1:(0.9b / a ~ 1.1b / a)).

[0067] Comparative Example 5 The fabric was prepared using the same method as in Example 1, except that the ratio of the weaving speed to the lead-out speed of the aramid yarn in Comparative Example 5 was 0.9:1 (not within the range of (1.05-1.15):1 as defined in this invention).

[0068] Comparative Example 6 The fabric was prepared using the same method as in Example 1, except that the ratio of the weaving speed of the inner filament to the speed of the lead-out yarn in Comparative Example 6 was 1:1 (not within the range of 1:(1.2-1.3) as defined in this invention).

[0069] Comparative Example 7 The fabric was prepared using the same raw materials as in Example 1, except that: in this Comparative Example 7, a single-layer fabric was used, woven only with the outer layer of flame-retardant aramid yarn, with a weight of 100 g / m². 2 .

[0070] The fabrics prepared in the above embodiments and comparative examples were subjected to relevant performance tests to characterize their properties. These tests mainly included flame retardant performance characterization (thermal protection performance), antistatic performance characterization (point-to-point resistance and surface charge density), comfort performance characterization (breathability, moisture permeability, and wearing comfort), and mechanical performance characterization (bursting strength). Specific test results are shown in Table 9 below. The test methods involved are as follows: The flame retardant protection performance adopts GB / T 38302-2019 "Test Method for Thermal Protection Performance of Protective Clothing", which tests the protection performance of the outer surface of the clothing to the skin surface when it comes into contact with flames or high temperatures; The antistatic performance is characterized by point-to-point resistance and charge surface density. The point-to-point resistance test adopts the test method in Appendix A of GB12014-2019 "Protective Clothing Antistatic Clothing", and the charge surface density adopts GB / T 12703.2-2021 "Textiles Electrostatic Properties Test Methods Part 2: Manual Friction Method". The air permeability was determined according to GB / T 5453-1997 "Textiles - Determination of air permeability of fabrics"; The moisture permeability was determined according to GB / T 12704.1-2009 "Textiles - Test Methods for Moisture Permeability of Fabrics - Part 1: Moisture Absorption Method"; The bursting performance was determined according to GB / T 7742.1-2005 "Textiles - Bursting Performance of Fabrics - Part 1: Determination of Bursting Strength and Bursting Expansion by Hydraulic Method".

[0071] The comfort of the clothing was assessed by having 20 people rate it by touch in a 30°C environment, with four levels: A, B, C, and D. A was the most comfortable, simulating the comfort level of a 60s combed long-staple cotton T-shirt, while D was the least comfortable, simulating the comfort level of a regular camouflage uniform.

[0072] The appearance of the garments is assessed visually. The assessment is conducted in a rating box using a D65 light source. The assessment method follows the time specified in clause 6.4.4 of GB / T 13769-2009 "Textiles - Test Method for Assessing the Smoothness of Fabric Appearance After Washing".

[0073] Through testing, the advantages of the fabric in terms of flame retardant protection, antistatic properties, breathability, moisture permeability, and comfort compared to ordinary fabrics were confirmed.

[0074] Table 9 Performance Test Results GB 8965.1-2020 "Flame-retardant Protective Clothing" and GB 12014-2019 "Antistatic Protective Clothing" are mandatory national standards for protective clothing proposed and managed by the Ministry of Emergency Management. They are widely used in the domestic protective clothing industry. The protective fabrics prepared using the method of this invention in Examples 1-8 all meet the Class A flame-retardant performance requirements and related strength requirements specified in GB 8965.1-2020; the antistatic performance requirement specified in GB 12014-2019 "Antistatic Protective Clothing" is 1×10⁻⁶. 5 ~1×10 11 Too large or too small a value is not conducive to preventing flashover accidents caused by static electricity.

[0075] This invention improves the comfort of existing protective clothing and reduces the price of existing fabrics while maintaining their protective function. Knitting is the preferred basic structural element, as it offers advantages such as softness, comfort, and fast, efficient weaving. By interlocking the inner and outer layers, air gaps can be formed at appropriate distances, reducing heat transfer and improving the fabric's thermal protection performance, as clearly demonstrated in the performance comparison in Table 9.

[0076] The experimental data from Example 1 and Comparative Example 1 show that if the fabric does not contain conductive filaments, it does not have antistatic properties, because the main material of both the conductive filaments and the inner filaments is regenerated cellulose fiber filaments, and their other properties are basically the same and not much different.

[0077] The experimental data from Examples 1-6 and Comparative Example 2 show that the thermal protection performance of most of the examples is slightly lower than that of Comparative Example 2, but the comfort performance is significantly improved, and they also meet the requirements of GB 8965.1-2020 "Flame-retardant Protective Clothing". The thermal protection performance of Examples 7 and 8 is basically the same as that of Comparative Example 2, and their wearing comfort reaches level A. This indicates that the appropriate ratio of meta-aramid and flame-retardant regenerated cellulose is beneficial to improving thermal protection performance, and the excellent comfort of flame-retardant regenerated cellulose fiber also contributes to improving the overall comfort of the samples.

[0078] A comparison of the experimental results of Comparative Examples 3, 4, 5 and Example 1 shows that: if the tension setting of the aramid yarn, the ratio of weaving speed to yarn lead-out speed, and the feeding ratio of inner and outer layer yarns (filaments) are not appropriate, differences in fabric appearance and performance will occur. Overall, the thermal protection performance is not significantly different because the overall structure of the fabric remains unchanged. The reduced breathability and moisture permeability affect the wearing comfort of the product, and it is easy to feel stuffy in high-temperature environments. The bursting strength is significantly reduced, affecting the wearing performance of the product. The most obvious result is poor fabric surface smoothness, which seriously affects the aesthetics and reduces wearing comfort.

[0079] Comparative Example 6 shows that due to the mismatch between the lead-out speed and the weaving speed of the conductive filament, the conductive filament broke multiple times during the weaving process, requiring the machine to be stopped and reconnected, which reduced work efficiency. Furthermore, obvious filament breakage was visible in the product, resulting in poor conductivity and affecting wearing comfort and appearance.

[0080] The comparison of the experimental results of Comparative Example 7 and Example 1 shows that the thermal protection performance of using only a single layer of fabric is severely reduced. The lack of moisture-wicking properties of aramid fabric leads to a decrease in moisture permeability. The absence of conductive fibers reduces the conductivity of the sample, making it prone to static electricity and reducing comfort.

[0081] The above analysis shows that, compared with commonly used clothing fabrics, the protective fabric described in this invention maintains the mechanical properties, antistatic properties, and flame-retardant protective properties that conventional fabrics should have, while greatly improving its breathability, moisture permeability, and comfort, thus fully leveraging the performance advantages of knitted fabrics.

[0082] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are exhaustively listed. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0083] For those skilled in the art, various modifications and improvements can be made without departing from the concept of the present invention, and these modifications and improvements are all within the scope of protection of the present invention. The scope of protection of the present invention is defined by the appended claims.

Claims

1. A method for preparing a flame-retardant, antistatic, and comfortable knitted fabric, characterized in that, The preparation method is as follows: The knitted fabric is obtained by using a double-sided knitting method with aramid yarn and conductive filament, wherein the conductive filament is the inner layer and the aramid yarn is the outer layer; The matrix material of the conductive filament is regenerated cellulose fiber filament.

2. The method for preparing a flame-retardant, antistatic, and comfortable knitted fabric according to claim 1, characterized in that, The difference in fineness between the aramid yarn and the conductive filament does not exceed 5 s / 1.

3. The method for preparing a flame-retardant, antistatic, and comfortable knitted fabric according to claim 1, characterized in that, The aramid yarn is a 50s / 1-80s / 1 yarn, the main body of the aramid yarn is aramid short fiber, and the twist is 300-450 twists / m; the aramid yarn contains or does not contain 5%-10% by mass of para-aramid short fiber and / or 10%-40% by mass of flame-retardant regenerated cellulose fiber. The aramid staple fiber has a denier of 1-2D and a length of 38mm-51mm.

4. The method for preparing a flame-retardant, antistatic, and comfortable knitted fabric according to claim 1, characterized in that, The conductive filament is formed by plying conductive fibers and regenerated cellulose fibers, with a ply ratio of conductive fibers to regenerated cellulose fibers of 1:(5-20). The conductive fibers account for 1%-10% of the mass of the knitted fabric. The twist of the conductive filament is 50-150 twists / m.

5. The method for preparing a flame-retardant, antistatic, and comfortable knitted fabric according to claim 4, characterized in that, The conductive filament is located on the inner side of the braiding equipment, while the aramid yarn is located on the outer side. During the braiding process, the conductive filament is cross-braided with the outer aramid yarn every 3-15 stitches, and 1-3 yarns are hooked at the same time.

6. The method for preparing a flame-retardant, antistatic, and comfortable knitted fabric according to claim 1, characterized in that, The elongation of the aramid yarn is 10%-30%, and the ratio of the weaving speed to the yarn output speed of the aramid yarn is (1.05-1.15):1; The elongation of the conductive filament is 8%-15%, and the ratio of the braiding speed of the conductive filament to the filament delivery speed is 1:(1.2-1.3).

7. The method for preparing a flame-retardant, antistatic, and comfortable knitted fabric according to claim 1, characterized in that, During the weaving process, a yarn feeder is used to feed in conductive filaments. The yarn feeder consists of a tension sensor, a yarn guide nozzle, a yarn controller, a yarn fixing frame, and a motor. The yarn bobbin is fixed on the yarn frame, and the motor drives the yarn frame to rotate, thus guiding the yarn out according to the weaving speed. A waxing device is added to the front end of the yarn guide nozzle.

8. The method for preparing a flame-retardant, antistatic, and comfortable knitted fabric according to claim 1, characterized in that, The elongation of the conductive filament is a, and the elongation of the aramid yarn is b. Then the tension of the conductive filament is... N; When weaving fabric, the ratio of the feeding speed of the aramid yarn to the feeding speed of the conductive filament is 1: (0.9b / a ~ 1.1b / a).

9. A flame-retardant, anti-static, and comfortable knitted fabric, characterized in that, The knitted fabric is prepared by the preparation method described in any one of claims 1-8.

10. The flame-retardant, antistatic, and comfortable knitted fabric according to claim 9, characterized in that, The weight of the knitted fabric is 100-160 g / m². 2 The weight of the conductive filament accounts for 1%-10% of the total weight of the knitted fabric.

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