Three-dimensional unidirectional moisture-wicking and flame-resistant thermal protective fabric

Abstract

This invention relates to a three-dimensional, one-way moisture-wicking, flame-retardant, and thermal protective fabric. By selecting specific fiber compositions and ratios for the outer and inner yarns, the fabric possesses excellent flame-retardant properties while also exhibiting superior moisture-wicking capabilities. This allows for the rapid removal of sweat generated by the body, reducing sweat adhesion to the skin's surface. Simultaneously, the arched structure formed on the fabric surface increases its moisture permeability and breathability, enhancing wearing comfort. Furthermore, applying this fabric to the inner layer of fire-fighting suits can improve the thermal and moisture comfort of the suit and increase thermal protection performance while reducing the overall weight of the garment.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of textile processing, and particularly relates to a three-dimensional one-way moisture-conducting flame-retardant thermal protective fabric. BACKGROUND

[0002] Flame-retardant protective clothing is needed in flammable and explosive fields to protect the safety of producers, such as in the petroleum, chemical and natural gas fields, and flame-retardant anti-static protective clothing is needed, and the promulgation of the latest safety law requires special industries to be equipped with flame-retardant protective clothing, so the demand for flame-retardant products will increase, and the comfort of the fabric of the clothing has become a focus of attention. The existing flame-retardant clothing is divided into two types, one is flame-retardant finishing, and this type of fabric mainly realizes flame-retardant finishing through all-cotton and polyester-cotton finishing. Cotton has excellent moisture absorption and good wearability, but the commonly used flame-retardant finishing of cotton fabric is mainly halogen, fluorine and organic phosphorus compounds, but halogen flame retardants produce harmful substances in the process of use and pollute the environment, so the use of halogen flame retardants has been prohibited in China. The other type is intrinsic flame-retardant, which realizes permanent flame-retardant of the product by mixing and matching intrinsic flame-retardant materials. This type of protective clothing has been applied in the petroleum and chemical industries. For some high-risk industries, such as fire fighting and metallurgy, especially in the field of fire fighting, the protective clothing needs to directly face the heat generated by open flames when close to the fire. The protective requirement is not only flame-retardant, but also needs high thermal protective performance. The biggest feature of these fields is that the workers often need to face high-temperature operation, so the wearing comfort of the protective clothing is greatly restricted, especially in heat and moisture transfer. The biggest feature of the intrinsic flame-retardant protective clothing is flame-retardant, but the material is chemical fiber, and the surface of this type of fiber is non-heterogeneous section, which has a big problem in moisture absorption and moisture transfer. The one-way moisture-conducting fabric on the market usually uses a finishing coating to realize the function, but the moisture-conducting effect of the fabric becomes poor or even disappears after multiple washes, and the fabric has the problem of not being washable. The moisture absorption and quick drying products on the market mainly focus on the polyester fiber with heterogeneous section, which improves the wicking capacity of the fabric through the grooves on the surface of the fiber. However, this material has the problem of not being flame-retardant. On the other hand, the existing flame-retardant products use a coating moisture absorption and quick drying aid to realize the function. In order to improve the quick moisture-conducting capacity of the workers in the high-temperature environment and still maintain excellent moisture absorption and quick drying capacity after multiple washes, a fiber with heterogeneous section needs to be introduced to improve the moisture absorption performance.

[0003] Due to the high-temperature environment in the workshop in summer, the demand for moisture absorption and quick drying products is the key technical research to solve the wearing comfort of the workers. On the premise of not affecting the flame-retardant function, realizing the intrinsic moisture absorption and quick drying function of the material is helpful to the functional upgrading of the product.

[0004] Since the flame-retardant product uses high-performance fiber, the moisture regain of such fiber is low and the hygroscopicity is poor. Therefore, it is impossible to combine intrinsic moisture absorption and moisture transfer with flame retardance when developing a fabric with fast moisture absorption and moisture transfer performance. The existing moisture absorption and moisture transfer fabric mainly realizes the function through post-finishing additives. In the post-finishing process of the fabric, moisture absorption and sweat release additives are added in the finishing additives to realize the function of moisture absorption and moisture transfer. However, the moisture absorption of such products is temporary. Once the fabric is washed for many times, the moisture absorption and moisture transfer performance will be poor, and the permanent moisture transfer function cannot be realized. The products on the market with moisture absorption and moisture transfer fabric are non-flame-retardant, and cannot have flame-retardant performance. SUMMARY

[0005] The technical problem to be solved by the present application is to provide a three-dimensional one-way moisture transfer flame-retardant thermal protective fabric with excellent thermal insulation and moisture absorption and moisture transfer performance.

[0006] The fabric is composed of two layers. The raised part of the double layer is formed by using different warp feed amounts of warp yarns. The flat part after the raised part is formed by using a layer-changing structure of the surface layer and the inner layer.

[0007] In the double-layer structure, the surface layer yarn is composed of three or more than three of meta-aramid fiber, para-aramid fiber, flame-retardant viscose fiber and Tencel fiber. The inner layer includes yarns with fast moisture transfer, which is composed of three or more than three of modacrylic fiber, flame-retardant viscose fiber, meta-aramid fiber, seaweed fiber and outcool polyester-based fiber.

[0008] In the surface layer yarn of the double-layer fabric, the proportion of meta-aramid fiber is 40-70 wt.%, the proportion of para-aramid fiber is 5-10 wt.%, the proportion of flame-retardant viscose is 20-45 wt.%, and the proportion of Tencel is 10-20 wt.%. The fiber mass percentage in the surface layer yarn is 100%.

[0009] In the inner layer yarn of the double-layer fabric, the proportion of modacrylic fiber is 40-55 wt.%, the proportion of flame-retardant viscose fiber is 10-20 wt.%, the proportion of outcool polyester-based fiber is 20-35 wt.%, and the proportion of seaweed fiber is 5-8 wt.%. The fiber mass percentage in the inner layer yarn is 100%.

[0010] The inner layer further includes an inner layer conductive yarn, which is wrapped with the inner layer yarn and 20D conductive black yarn. The wrapping twist is 60-62 twists / 10 cm.

[0011] The single yarn twist factor of the surface layer yarn and the inner layer yarn is 315-330, the strand twist factor is 415-430, the yarn count is 30 s / 2-60 s / 2, and the yarn breaking strength is greater than or equal to 15.0 cN / tex.

[0012] The fabric has a grammage of 140 g / m 2-250g / m 2 .

[0013] The application also provides a preparation method of the three-dimensional flame-retardant fabric, comprising the following steps:

[0014] (1) Preparation of double-layer fabric: in the double-layer structure, the arrangement ratio of the surface layer warp yarns to the inner layer warp yarns is 1.6-1.9:1, and the surface layer warp yarn feeding amount is 2.2 times that of the inner layer warp yarn feeding amount;

[0015] (2) The structure is changed in the size of 0.2 cm in the surface and inner layer, and 4 wefts are interwoven between the surface warp yarns and the inner weft yarns at the change position, then every 2 wefts introduces 1 water-soluble vinylon yarn with a yarn count of 16 s -32 s , the vinylon is in the middle of the interweaving of the surface and inner layers and does not interweave with the surface and inner layer warp and weft yarns;

[0016] (3) The surface layer of the double-layer fabric adopts plain weave or 2 / 1 twill, and the inner layer adopts change weave;

[0017] (4) The water-soluble vinylon yarn needs to be interwoven and fixed by warp binding yarn every 2 yarns to ensure that the position of the introduced water-soluble yarn does not change;

[0018] In the design of the fabric structure, the weft density of the surface layer and the smooth part of the protrusion is 1.4-1.9:1, so as to achieve a dense surface layer, a certain gap between the inner layer and the protrusion layer of the surface layer, and the use of a high-hygroscopic blended yarn in the inner layer to improve the wicking capacity, the concave-convex form of the inner layer can increase the moisture permeability of the fabric, so as to achieve rapid moisture transfer, and the size of the air cavity is adjusted by the size of the surface and inner layer warp and weft density;

[0019] (5) The fabric is woven by a double-beam loom, and the tension of the surface layer and the inner layer is controlled to be 3-4:1; the fabric has a grammage of 140g / m 2 -250g / m 2 ;

[0020] (6) The gray fabric is finished into a finished product, and the water-soluble vinylon is dissolved during finishing. When desizing is performed on the desizing machine, 5-10 g / L of oil removal agent and 10-25 g / L of desizing enzyme are added to the desizing agent, and the vinylon is dissolved by being treated in hot water for 40-50 min, so as to reduce the grammage of the fabric and also retain the flat surface of the fabric and the concave-convex effect of the inner layer.

[0021] The temperature of the hot water in step (6) is 90°C.

[0022] In step (1), one conductive yarn is added to the inner layer yarn at an interval of 0.5 cm.

[0023] The product of this invention utilizes specific fiber compositions and ratios in its outer and inner layer yarns to create a fabric that possesses excellent flame-retardant properties while also exhibiting superior moisture absorption and wicking capabilities. This allows for the rapid removal of sweat generated by the body, reducing sweat adhesion to the skin's surface. Simultaneously, the arched structure formed on the fabric surface enhances its moisture permeability and breathability, improving wearing comfort. Furthermore, applying this fabric to the inner layer of firefighting suits can help improve the thermal and moisture comfort of the suits and increase thermal protection performance while reducing the overall weight of the garment. Attached Figure Description

[0024] Figure 1 This describes the appearance and structural form of the multi-dimensional three-dimensional flame-retardant heat protection fabric of the present invention.

[0025] Figure 2 This refers to the arrangement of the conductive yarn and ground yarn in the inner layer fabric.

[0026] 1 is the outer fabric; 2 is the inner fabric; 3 is water-soluble vinylon yarn; 4 is conductive yarn; 5 is warp yarn; 6 is weft yarn. Detailed Implementation

[0027] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0028] Example 1

[0029] In this embodiment, the surface yarn is made by blending meta-aramid fiber, para-aramid fiber, flame-retardant viscose fiber, and Tencel fiber in a ratio of 35:5:45:15. All fibers used are natural-colored fibers, and the yarn count is 37. s / 2, the twist coefficient of the ply is 430, and the breaking strength of the yarn is 16.5 cN / tex. The inner layer yarn contains 45% acrylic fiber, 15% flame-retardant viscose, 7% meta-aramid, and 33% outcoyl polyester fiber. The single yarn twist coefficient is controlled at 310, the ply twist coefficient is set at 423, the yarn unevenness is controlled at around 8%, and the yarn count is 60. s / 2, the yarn breaking strength is 15cN / tex, and the inner and outer layers are padded with water-soluble vinylon, which is soluble in hot water. The count of the water-soluble vinylon yarn is 16. s .

[0030] In terms of fabric specifications, the warp density is 400 threads / 10cm, the weft density is 390 threads / 10cm, and the fabric weight is 210g / m². 2 The outer fabric uses a 2 / 1 twill weave, and the inner fabric uses a... When altering the weave structure and joining the outer and inner layers, a weft splicing method is used. This involves joining the outer layer weft yarns to the inner layer warp yarns, with the outer and inner warp yarns arranged in a 1.6:1 ratio. Simultaneously, the weft density of the outer layer is 1.5 times that of the inner layer. The outer layer is spliced ​​to the inner layer every 1cm, meaning there are 4 weft splicing yarns after every 38 weft yarns, connecting the outer and inner layers. Furthermore, a twisted conductive yarn is added every 7 yarns in the inner layer. Secondly, before the outer and inner layers are joined, water-soluble new vinylon yarn is inserted. A 16mm yarn is introduced every 2 weft passes of the outer layer weft yarn. s Water-soluble vinylon yarn. In addition, the heddle is threaded in the straight direction, and the selvage is threaded in plain weave, with 4 threads threaded into each reed tooth, and 3 threads threaded into each reed tooth in the ground weave.

[0031] When weaving on a double warp beam, the feed rate of the surface warp yarn is twice that of the inner warp yarn, which is controlled by using padding yarn and tension of the surface warp yarn; that is, the surface tension is 200N and the inner tension is 800N.

[0032] The woven fabric undergoes pretreatment, which includes fabric inspection, defect repair, and removal of oil stains from the fabric surface.

[0033] The greige fabric undergoes finishing processes, primarily desizing, dyeing, softening, stretching, setting, and pre-shrinking. Desizing is performed using a long desizing machine. An oil remover (10g / L) and desizing enzyme (20g / L) are added to the desizing solution. Desizing is carried out in hot water to dissolve the water-soluble vinylon. The desizing machine speed is controlled at 20m / min to fully dissolve the vinylon. After washing, the fabric proceeds to the next process. During setting on the setting machine, the weft direction must be stretched flat with a 2.5% overfeed to ensure that the raised parts of the inner fabric are not flattened.

[0034] Example 2

[0035] In this embodiment, the surface yarn is made by blending meta-aramid fiber, flame-retardant viscose fiber, and Tencel in a ratio of 52:28:20. All fibers used are natural-colored fibers, and the yarn count is 44. s / 2, the twist coefficient of the ply is 420, and the breaking strength of the yarn is 16.0 cN / tex. The inner layer yarn contains 50% acrylic fiber, 20% flame-retardant viscose, 5% para-aramid, 5% seaweed fiber, and 20% outcool polyester-based fiber. The single yarn twist coefficient is controlled at 315, the ply twist coefficient is set at 426, the yarn unevenness is controlled at around 8%, and the yarn count is 50. s / 2, the yarn breaking strength is 15cN / tex, and the inner and outer layer padding yarns are made of water-soluble vinylon, which can be dissolved in hot water at 90℃. The count of the water-soluble vinylon yarn is 21. s .

[0036] In the fabric specification design, the warp density is 335 / 10 cm, the weft density is 256 / 10 cm, and the fabric design weight is 140 g / m 2 The surface fabric adopts 2 / 1 twill weave, and the inner fabric weave adopts The surface and inner layers are connected by weft knitting, i.e. the surface weft yarns connect the inner warp yarns, and the surface warp yarns and the inner warp yarns are arranged according to a ratio of 1.7:1, and the weft surface density is 1.5 times the inner layer density, and the surface is connected with the inner layer every 1 cm, i.e. after 15 weft yarns, 4 weft connecting yarns are connected to connect the surface and inner layers; secondly, water-soluble vinylon yarns need to be filled in when the surface and inner layers are not connected, and every 2 weft yarns of the surface weft yarns introduce 1 water-soluble vinylon yarn of 21 s In addition, the weft-on-end method is adopted when the harness is worn, the fabric edge adopts plain weave when the reed is worn, and the number of weft yarns per reed tooth is 4, and the number of ground weft yarns per reed tooth is 3.

[0037] When weaving on the double-beam loom, the warp tension of the surface layer is 2 times the warp tension of the inner layer, which is controlled by the tension of the padding yarn and the warp yarn of the surface layer; i.e. the surface tension is 180 N, and the inner tension is 600 N.

[0038] The woven gray fabric is pretreated, i.e. fabric inspection, defect repair and oil removal on the fabric surface.

[0039] The gray fabric is post-treated, and the post-treatment process mainly includes desizing, dyeing, softening, stretching, setting and preshrinking. Long car desizing is adopted in desizing, and oil removal agent (15 g / L) and desizing enzyme (25 g / L) are added in the desizing solution to desize, dissolve water-soluble vinylon and dissolve water-soluble vinylon in hot water at 90°C, at this time, the desizing machine speed is controlled at 20 m / min, and after the vinylon is fully dissolved, it is washed and then subjected to the next process. When setting on the setting machine, the weft must be flat and the overfeed is 2.2%, to ensure that the protruding part of the inner fabric is not flattened.

[0040] Example 3

[0041] In this embodiment, the surface yarn is spun by mixing meta-aramid fiber, flame-retardant viscose fiber and Tencel fiber according to a ratio of 60:30:10, and the used fibers are all this fiber, the yarn count is 38 s / 2, the strand twist factor is 435, and the yarn breaking strength is 16.5 cN / tex. The proportion of modacrylic fiber in the inner layer yarn is 50%, the proportion of flame-retardant viscose is 20%, the proportion of para-aramid is 5%, and the proportion of outcool polyester-based fiber is 25%. The single yarn twist factor of the yarn is controlled at 310, the strand twist factor is set at 425, the yarn unevenness is controlled at about 8%, the yarn count is 50 s / 2, and the yarn breaking strength is 15 cN / tex. In addition, water-soluble vinylon is used as the padding yarn of the surface and inner layers, which can be dissolved in hot water at 90°C. The water-soluble vinylon count is 32s .

[0042] In the fabric specification design, the warp density is 415 / 10 cm, the weft density is 355 / 10 cm, and the fabric design weight is 225 g / m 2 The surface fabric adopts plain weave, and the inner fabric adopts change weave. When the surface and inner layers are connected, the weft connection method is used, that is, the surface weft yarn connects the inner warp yarn, and the surface warp yarn and the inner warp yarn are arranged in a ratio of 1.9:1. At the same time, the weft surface density is 1.5 times the inner layer density, and the surface is connected with the inner layer every 1 cm, that is, after 23 weft yarns, 4 weft connection yarns are connected, connecting the surface and inner layers. At the same time, water-soluble vinylon yarn needs to be filled in when the surface and inner layers are not connected, and every 2 weft yarns of the surface weft yarn introduce 1 root of 32 s water-soluble vinylon yarn. In addition, the order weaving method is used when the harness is woven, the edge is woven when the reed is woven, and the number of weft yarns per reed tooth is 4, and the ground weave is 3.

[0043] When weaving on the double-beam loom, the warp tension of the surface layer is 2 times that of the inner layer, and the tension of the surface layer is controlled by using the padding yarn and the warp tension of the surface layer; that is, the surface tension is 275 N, and the inner tension is 845 N.

[0044] The woven gray fabric is pretreated, that is, the fabric is inspected, defects are repaired, and oil stains on the fabric surface are removed.

[0045] The gray fabric is post-treated, and the post-treatment process mainly includes desizing, dyeing, softening, tentering, setting, and preshrinking. Long car desizing is used for desizing, and oil removal agent (5 g / L) and desizing enzyme (20 g / L) are added to the desizing solution for desizing, dissolution of water-soluble vinylon, and dissolution of water-soluble vinylon in hot water at 90°C. At this time, the desizing machine speed is controlled at 20 m / min, and after the vinylon is fully dissolved, it is washed and then subjected to the next process. When setting on the setting machine, the weft must be flat and the feeding is 3.0%, which ensures that the raised part of the inner fabric is not flattened.

[0046] Example 4

[0047] In this embodiment, the surface yarn is spun by mixing aramid fiber, flame-retardant viscose fiber, and Tencel fiber in a ratio of 65:20:15, and the fibers used are all natural color fibers, with a yarn count of 50 s / 2 and a strand twist factor of 430. The yarn breaking strength is 16.5 cN / tex. The inner layer yarn contains 40% modacrylic fiber, 15% flame-retardant viscose, 7% para-aramid, 28% outcool polyester-based fiber, and 10% seaweed fiber. The single yarn twist factor is controlled at 320, the strand twist factor is set at 420, the yarn unevenness is controlled at about 8%, and the yarn count is 50 s / 2, the yarn breaking strength is 15.5 cN / tex, and the top and back layers are padded with water-soluble vinylon which can be dissolved in hot water at 90°C, and the water-soluble vinylon yarn count is 30 s .

[0048] In the fabric specification design, the warp density is 410 roots / 10 cm, the weft density is 295 roots / 10 cm, and the fabric design gram weight is 180 g / m 2 The top layer fabric adopts plain weave, and the back layer fabric adopts When the top and back layers are connected, the weft connection method is adopted, that is, the top layer weft yarn connects the back layer warp yarn, the top layer warp yarn and the back layer warp yarn are arranged according to the proportion of 1.8:1, and at the same time, the weft density of the top layer is 1.5 times that of the back layer, and the top layer is connected with the back layer every 1 cm, that is, after 30 weft yarns, 4 weft connection yarns are connected, which connects the top and back layers, and at the same time, water-soluble vinylon yarn needs to be filled in the top and back layers which are not connected, and every 2 weft yarns of the top layer weft yarn introduce 1 water-soluble vinylon yarn with a count of 30 s In addition, the order weaving method is adopted when the heald is woven, the plain weave is adopted when the reed is woven, and the number of weft yarns per reed tooth is 4.

[0049] When weaving on the double-beam loom, the warp tension of the top layer is 2 times that of the back layer, which is controlled by the tension of the padding yarn and the top layer warp yarn; that is, the top layer tension is 250 N, and the back layer tension is 850 N.

[0050] The woven gray fabric is pretreated, that is, the fabric is inspected, the defects are repaired, and the oil stains on the fabric surface are removed.

[0051] The gray fabric is post-treated, and the post-treatment process mainly includes desizing, dyeing, softening, tentering, setting and preshrinking. Long car desizing is adopted in desizing, and oil removal agent (10 g / L) and desizing enzyme (20 g / L) are added in the desizing solution to desize, dissolve water-soluble vinylon in hot water at 90°C, at this time, the speed of the desizing machine is controlled at 20 m / min, and after the vinylon is fully dissolved, it is washed and then subjected to the next process. When setting on the setting machine, the weft must be flat and the overfeed is 2.5%, so as to ensure that the protruding part of the back layer fabric is not flattened.

[0052] Example 5

[0053] In this embodiment, the top layer yarn is spun by mixing meta-aramid fiber, flame-retardant viscose fiber and para-aramid fiber according to the proportion of 65:30:5, and the used fibers are all natural color fibers, and the yarn count is 45 s / 2, the yarn breaking strength is 18.2 cN / tex. The proportion of acrylonitrile fiber in the inner layer yarn is 50%, the proportion of flame-retardant viscose is 13%, the proportion of outcool polyester-based fiber is 30%, and the proportion of seaweed fiber is 7%. The single yarn twist factor of the yarn is controlled at 320, the strand twist factor is set to 430, the yarn unevenness is controlled at about 10%, and the yarn count is 45 s / 2, the yarn breaking strength is 15 cN / tex, and water-soluble vinylon is used for the top and bottom layer, which can be dissolved in hot water at 80°C. The water-soluble vinylon count is 16 s .

[0054] In the fabric specification design, the warp density is 435 roots / 10 cm, the weft density is 410 roots / 10 cm, and the fabric design weight is 240 g / m 2 . The top layer fabric adopts 2 / 1 twill weave, and the inner layer fabric adopts When the top and bottom layers are connected, the weft connection method is used, that is, the top layer weft yarn connects the inner layer warp yarn, and the top layer warp yarn and the inner layer warp yarn are arranged in a ratio of 1.65:1. At the same time, the weft density of the top layer is 1.5 times that of the inner layer, and the top layer is connected with the inner layer every 1 cm, that is, after 40 weft yarns, 4 weft connection yarns are connected, connecting the top and bottom layers. At the same time, water-soluble vinylon yarn needs to be filled in when the top and bottom layers are not connected, and every 2 weft yarns of the top layer weft yarn introduce 1 root of 16 s water-soluble vinylon yarn. In addition, the weft yarns are arranged in the order of the top layer, the inner layer, and the water-soluble vinylon yarn. In addition, the weft yarns are arranged in the order of the top layer, the inner layer, and the water-soluble vinylon yarn.

[0055] When weaving on the double-beam loom, the warp tension of the top layer is 2 times that of the inner layer, and the tension of the top layer is controlled by the warp tension of the top layer and the inner layer. That is, the top layer tension is 300 N, and the inner layer tension is 1200 N.

[0056] The woven gray fabric is pretreated, that is, the fabric is inspected, defects are repaired, and oil stains on the fabric surface are removed.

[0057] The gray fabric is post-treated, and the post-treatment process mainly includes desizing, dyeing, softening, tentering, setting, and preshrinking. Long car desizing is used for desizing, and oil removal agent (8 g / L) and desizing enzyme (25 g / L) are added to the desizing solution for desizing and dissolution of water-soluble vinylon in hot water at 90°C. At this time, the desizing machine speed is controlled at 20 m / min, and the vinylon is fully dissolved before washing and then subjected to the next process. When setting on the setting machine, the weft must be flat and the overfeed is 2.0%, to ensure that the raised part of the inner layer fabric is not flattened.

[0058] Principles, steps and the like not explicitly described in the present application are obtainable by those skilled in the art through routine technical means, and thus are not described in detail. Obviously, those skilled in the art can make various modifications and variations to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and equivalent technologies thereof, the present application is also intended to include these modifications and variations.

Claims

1. A three-dimensional flame-retardant fabric, characterized in that, The fabric consists of two layers. The raised part of the two layers is formed by inconsistent warp yarn feed, and the flat part after the raised part adopts a layer-changing structure. In the double-layer structure, the outer layer yarn is composed of three or more of the following: meta-aramid fiber, para-aramid fiber, flame-retardant viscose fiber, and Tencel fiber. The inner layer includes yarn with fast moisture wicking, which is composed of three or more of the following: acrylonitrile fiber, flame-retardant viscose fiber, meta-aramid fiber, seaweed fiber, and outcool polyester-based fiber. The double-layer fabric has an intermediate aramid content of 40-70 wt.%, a para-aramid content of 5-10 wt.%, a flame-retardant viscose content of 20-45 wt.%, and a Tencel content of 10-20 wt.%, with the fiber mass percentage in the surface yarn being 100%. The inner layer yarn of the double-layer fabric contains 40-55 wt.% acrylic fiber, 10-20 wt.% flame-retardant viscose fiber, 20-35 wt.% outcool polyester fiber, and 5-8 wt.% seaweed fiber, with the fiber mass percentage of the inner layer yarn being 100%. The method for preparing the three-dimensional flame-retardant fabric includes the following steps: (1) Preparation of double-layer fabric: In the double-layer structure, the yarn ratio of the outer layer warp yarn to the inner layer warp yarn is 1.6-1.9:1, and the amount of warp yarn fed in the outer layer is 2.2 times that of the amount of warp yarn fed in the inner layer; (2) The structure has a layer size of 0.2cm between the outer and inner layers, and the outer warp and inner weft need to be interwoven for 4 wefts at the layer change point. Then, a water-soluble vinylon is introduced every 2 wefts, and the yarn count is 16. s -32 s The vinylon is located between the outer and inner layers and does not interweave with the outer and inner warp and weft yarns; (3) The outer layer of the double-layer fabric is plain weave or 2 / 1 twill weave, and the inner layer is made of... Changes in organization; (4) Every two water-soluble vinylon yarns need to be interlaced and fixed by warp splicing to ensure that the position of the introduced water-soluble yarns does not change. In the fabric structure design, the weft density of the raised and stable parts of the outer and inner layers is designed to be 1.4-1.9:1, so that the outer layer is dense and the inner layer has a certain gap with the surface layer. At the same time, the inner layer uses a blended yarn with high moisture absorption to improve the wicking capacity. The concave and convex shape of the inner layer can increase the moisture permeability of the fabric, thereby achieving rapid moisture wicking. The size of the air cavity is adjusted by the warp and weft density of the outer and inner layers. (5) The fabric is woven on a double beam loom, and the tension between the outer and inner layers is controlled at 3-4:1; the fabric weight is 140 g / m². 2 -250 g / m 2 ; (6) The fabric is finished after finishing. During finishing, the water-soluble vinylon must be dissolved. When desizing on the desizing machine, add 5-10g / L of degreasing agent and 10-25g / L of desizing enzyme to the desizing agent. Treat in hot water for 40-50 minutes to fully dissolve the vinylon, thereby reducing the weight of the fabric and retaining the smoothness of the fabric surface and the texture of the inner layer.

2. The three-dimensional flame-retardant fabric according to claim 1, characterized in that, The inner layer also includes an inner conductive yarn, which is made by wrapping the inner yarn with 20D conductive black silk, with a wrapping twist of 60-62 twists / 10cm.

3. The three-dimensional flame-retardant fabric according to claim 1, characterized in that, The single yarn twist coefficient of the outer layer yarn and the inner layer ordinary yarn is 315-330, the ply twist coefficient is 415-430, and the yarn count is 30. s / 2-60 s / 2, and the yarn breaking strength ≥15.0 cN / tex.

4. The three-dimensional flame-retardant fabric according to claim 1, characterized in that, The fabric has a weight of 140 g / m². 2 -250 g / m 2 .

5. The three-dimensional flame-retardant fabric according to claim 1, characterized in that, In step (1), a conductive yarn is added at a warp interval of 0.5 cm in the inner layer yarn.

6. The three-dimensional flame-retardant fabric according to claim 1, characterized in that, The temperature of the hot water in step (6) is 90°C.

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