Novel graphene composite fiber flame-retardant comfortable double-layer fabric

Abstract

The invention discloses a novel graphene composite fiber flame-retardant comfortable double-layer fabric which is of a double-layer structure, the outer layer is of a multifunctional twill serge fabric structure with a flame-retardant function, and the inner layer is of a one-way moisture-conducting plain weave fabric structure with a flame-retardant function. According to the novel flame-retardant comfortable fabric manufactured through the method, dyeing is conducted after weaving, the inner layer polyimide and the flame-retardant viscose have the flame-retardant function, the fabric is treated through an after-finishing process, the one-way moisture guiding function is achieved, the wearing comfort and the wearability of a thermal insulation material are improved, and the fabric has the advantages of being good in flame-retardant performance, good in flame-retardant performance, good in flame-retardant performance and the like. The outer graphene composite polyester fiber has the functions of bacteriostasis and peculiar smell removal, the aramid fiber 1313 and the flame-retardant viscose have the flame-retardant function, the wool can improve the quality feeling and the touch comfort degree of the fabric, and the fabric effects of being excellent in flame-retardant performance and high-temperature resistance, comfortable to wear, capable of conducting moisture and removing sweat, antibacterial and high in quality feeling are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of textile weaving, and in particular to a novel flame-retardant and comfortable double-layer fabric made of graphene composite fibers. Background Art

[0002] With the development of society and the progress of industry, the demand for flame retardancy, functionality and comfort of fabrics in special fields is increasing. Flame retardant fabrics can be divided into two categories: pure spinning and blended spinning. Pure spinning flame retardant fabrics are woven from completely flame retardant fibers such as aramid or other flame retardant fibers. However, pure spinning flame retardant fabrics have disadvantages such as poor hand feel, high cost, poor durability and functionality.

[0003] Flame retardant blended fabric is a textile specially designed to improve fire resistance. It is made of a mixture of multiple fibers, at least one of which has flame retardant properties. Such fibers can be natural fibers such as wool, or synthetic fibers such as aramid 1313, flame retardant polyester, flame retardant viscose, polyimide, etc. By blending these flame retardant fibers with other fibers to form a blended yarn with a specific count, and then forming a plain or twill structure through a weaving process, and adding unidirectional moisture conduction through a post-finishing process, the fabric can not only maintain the product characteristics of softness, comfort, durability, unidirectional moisture conduction, and low cost, but also effectively slow down the spread of flames, thereby improving safety and comfort.

[0004] One-way moisture conduction means that when water drops on the outer layer of the fabric, the water spreads on the outer layer and cannot enter the inner layer of the fabric; when water drops on the inner layer of the fabric, the water quickly drains to the outer layer of the fabric and evaporates and diffuses on the outer layer, leaving the inner layer of the fabric dry. In order to achieve one-way moisture conduction performance, the fabric is usually post-processed by adding hydrophobic additives, waxing or 3D printing (the printing is a hydrophilic group).

[0005] Conventional blended flame-retardant fabrics are single-layer or multi-layer coated structures. Single-layer flame-retardant fabrics have disadvantages such as poor fabric feel, poor comfort, and limited functionality. Publication No. CN 118292171 A discloses an antibacterial and antistatic flame-retardant fabric, the preparation process of which is to mix meta-aramid fiber, para-aramid fiber, nylon fiber, flame-retardant viscose fiber, polyimide fiber, antibacterial modified nylon fiber, and conductive modified para-aramid fiber raw materials to prepare blended yarn, and weave it into flame-retardant and antibacterial fabric, but it has the following problems: too many fiber types are mixed, and the proportion of rigid fiber is too high, resulting in the inability to prepare high-count blended yarn, resulting in the finished fabric after weaving. The yarn count is coarse, the hand feel is rough, and the wearing comfort is poor; the single-layer fabric structure causes limited functionality and limited application scenarios.

[0006] The flame-retardant fabric with multi-layer film structure has the disadvantages of poor air permeability and moisture absorption and perspiration wicking, and the increase in thickness leads to an increase in the human body's stress response rate in a high temperature environment. Publication No. CN 118404881 A discloses a composite flame-retardant fabric and its preparation process. The flame-retardant performance of the fabric is increased by multiple composites of a multi-layer composite structure including a water-absorbing gauze, an antibacterial layer, a first flame-retardant layer, an epoxy resin layer, a second flame-retardant layer, a mica layer and a polyurethane coating. However, this process has the problems of poor air permeability, poor moisture permeability, high fabric weight, poor wearing comfort, etc. due to too many composite layers. In view of the above problems, a solution is proposed below. Summary of the invention

[0007] The purpose of the present invention is to provide a novel flame-retardant and comfortable double-layer fabric of graphene composite fiber, which has the product characteristics of softness, comfort, durability, unidirectional moisture conduction and low cost, and can also effectively slow down the spread of flames, thereby improving safety and comfort.

[0008] The above technical objectives of the present invention are achieved through the following technical solutions: A novel flame-retardant and comfortable double-layer fabric of graphene composite fiber comprises a fabric body, wherein the fabric body comprises an outer fabric and an inner fabric, wherein the outer fabric is of a twill weave structure, and is woven from a blended yarn of graphene composite flame-retardant polyester fiber, wool and aramid 1313 as fiber raw materials, wherein the content of graphene composite flame-retardant polyester fiber in the outer fabric is not higher than 15wt%, the content of wool in the outer fabric is not higher than 65wt%, and the yarn count of the blended yarn in the outer fabric is 32-50S; the inner fabric is a unidirectional moisture-conducting fabric with flame-retardant function, and is woven from a blended yarn of polyimide staple fiber and flame-retardant viscose staple fiber, wherein the inner fabric is of a plain weave structure, wherein the content of polyimide staple fiber in the inner fabric is not higher than 50wt%, the content of flame-retardant viscose staple fiber in the inner fabric is not lower than 50wt%, and the yarn count of the blended yarn in the inner fabric is 40-50S.

[0009] A method for preparing a novel flame-retardant and comfortable double-layer fabric made of graphene composite fibers comprises the following steps: S1: preparing an outer fabric, comprising at least 20wt% of aramid 1313 fiber, no more than 15wt% of graphene composite flame-retardant polyester fiber and no more than 65wt% of wool, through carding, drawing, roving, spinning and winding processes, to obtain a multifunctional twill serge structure with flame-retardant function; S2: To prepare the inner fabric, at least 50wt% of the flame retardant viscose staple fiber and no more than 50wt% of the polyimide staple fiber are prepared through the processes of needle combing, combing, drawing, roving, spinning and winding to obtain a hydrophobic layer with flame retardant function and unidirectional moisture conduction function; S3: Prepare flame-retardant and comfortable double-layer fabric of graphene composite fiber, connect the outer fabric and the inner fabric through fabric tissue points to obtain a blended fabric of flame-retardant graphene composite polyester fiber, wool, aramid 1313, polyimide and flame-retardant viscose, and then subject the blended fabric to singeing, flat washing, soft drying, pre-shrinking and heat setting to obtain flame-retardant grey cloth fabric of graphene composite fiber, and subject the grey cloth fabric to post-finishing process to obtain flame-retardant and comfortable graphene composite fiber fabric.

[0010] Preferably, the singeing treatment method in step S3 is: the blended fabric is singed using a gas singeing machine, with the fluff temperature being 300-600°C, the fabric body temperature being 80-110°C, and the fabric body temperature being 20-75°C when the fabric is dropped.

[0011] Preferably, the flat wash in step S3 is processed as follows: First, immerse the fabric in a solution containing detergent NF208 at 35-55°C for 15-100 minutes to fully wash away the dust on the surface of the fabric; The fabric is then soft-dried in the following manner: the fabric is driven by a large high-speed rotating drum and is hit by a dry cloth at a temperature of 100-135°C and a speed of 30-70m / min. The high-speed impact makes the fibers in the fabric fluffy and soft. The action time is 15-35min and the cloth loop length is 55-85m.

[0012] Preferably, the pre-shrinking treatment in step S3 is as follows: removing fabric creases after the fabric has been impacted by the dry cloth under the conditions of a steam volume of 80-120 kg / h, a steam temperature of 100-175° C., a steam pressure of 300-500 kPa, and a vehicle speed of 10-50 m / min; The heat setting treatment method in step S3 is: under the conditions of temperature of 90-180° C. and vehicle speed of 30-70 m / min, overfeeding is adopted, the width is controlled to be 135-165 cm, and the elongation is adjusted.

[0013] Preferably, the post-finishing process in step S3 includes the following steps: S31: boiling, at a solution temperature of 75-105°C, controlling the pH value to 5.5-8.5, boiling the fabric for 15-100 minutes, and then washing and drying; S32: washing the fabric, at a solution temperature of 35-55°C, controlling the pH value to 5.5-10.5, scouring the fabric for 30-100 minutes, and controlling the bath ratio to 1:3-1:10, which is conducive to washing the fabric evenly; S33: Shrinkage, at a temperature of 30-60°C, the radial shrinkage is controlled to be 2%-8%, and the weft shrinkage is 3%-13%; S34: dehydration and drying and setting the width, controlling the moisture content of the fabric after dehydration to 20%~45%, under the condition of drying temperature of 65~95℃, the speed of 5~25 m / min, and controlling the moisture regain after drying to 5%~15%; S35 dyeing, the dyeing adopts double dyeing process, using disperse dyes and reactive dyes, including the following two processes: S351: Disperse dyes are used to dye flame-retardant graphene composite polyester, aramid 1313 and polyimide, with a bath ratio of 1: (10-20) and a pH value of the dye controlled at 7-10; 0.5-2.5 g / L of dispersant is added, dyeing is performed at a temperature of 25-95 °C, and the temperature is raised to 95-200 °C at a rate of 0.5-2.5 °C / min. After dyeing, the mixture is kept warm for 15-115 min, and then washed and dried; S352: Use reactive dyes to dye wool and viscose, use 2%~6% ammonium sulfate, 0.3%~3.5% (owf) 60%~90% acetic acid, and 0.5%~3.5% (owf) leveling agent. Dye at 35~75℃, gradually increase the temperature to boiling, boil and dye for 20~120min, cool to 70~90℃ after dyeing, change the water, add ammonia water to adjust the pH to 8~9, and keep warm at 50~80℃ for 10~30min.

[0014] A design scheme for weaving specification parameters of a new type of graphene composite fiber flame-retardant and comfortable double-layer fabric, including the following specifications: Warp and weft blended yarn, yarn linear density warp 6.0~12.0tex, weft 6.2~12.2tex, fabric density warp 500~800 yarns / 10cm, weft 250~450 yarns / 10cm.

[0015] A design scheme for the specification parameters of the machine, grey cloth and finished product of a new type of flame-retardant and comfortable double-layer graphene composite fiber fabric, including the following specifications: Machine width 155~185cm, grey fabric width 150~165cm, finished product width 150~155cm; grey fabric surface density 155~210g / m 2 , finished product surface density 155~205g / m 2 ; Warping length 18~25; Reed number 110~119 teeth / 10cm, 2~7 yarns inserted into each reed, total yarn number 5300~11300.

[0016] A design scheme for the unidirectional moisture conduction function of a novel flame-retardant and comfortable double-layer graphene composite fiber fabric, in which the unidirectional moisture conduction performance is increased through a post-finishing process.

[0017] A new type of flame-retardant and comfortable double-layer graphene composite fiber fabric is used in flame-retardant industries such as the military, public security, and petrochemical industries, as well as in professional clothing that requires flame retardancy and comfort.

[0018] The beneficial effects of the present invention are: 1) The novel flame-retardant and comfortable graphene composite fiber fabric of the present invention has a double-layer structure. The outer layer and the inner layer have different functionalities and ratios of blended yarn fiber types, and the outer layer and the inner layer are connected by the tissue points of the fabric. The inner layer polyimide and flame-retardant viscose have flame-retardant function. The fabric is treated by post-finishing process to achieve unidirectional moisture conduction function, which improves the wearing comfort and wearing performance of the thermal insulation material. The outer layer graphene composite polyester fiber has antibacterial and deodorizing functions, aramid 1313 and flame-retardant viscose have flame-retardant function, and wool can improve the quality and touch comfort of the fabric. In addition, the count selection and spinning method are more flexible. The count is not limited to a single count, and can be applicable to specifications of 32S~50S; the spinning method is not limited to siro spinning, and can be applicable to various common spinning methods such as ring spinning, compact spinning, tight siro spinning, siro spinning, vortex spinning, etc. 2) The novel flame-retardant and comfortable graphene composite fiber fabric of the present invention has a double-layer structure, the outer layer is a multifunctional twill serge fabric structure with flame-retardant function, and the light gray uniform yarn effect is formed by the blending technology of graphene composite flame-retardant polyester fiber, wool and aramid 1313. In the later dyeing and finishing treatment, the amount of dye in the dyeing process can be reduced. The gray scale itself makes the color depth and fastness of the blended yarn exceed that of ordinary blended yarn, which is more energy-saving and environmentally friendly, reduces costs, and the product color is more layered and has stronger wash resistance; the inner layer is a unidirectional moisture-conducting plain fabric structure with flame-retardant function, which is woven from blended yarns blended from polyimide staple fibers and flame-retardant viscose staple fibers as raw materials. The unidirectional moisture-conducting performance is increased through the post-finishing process, thereby increasing the comfort and applicability of the fabric.

[0019] 3) The graphene composite flame-retardant fiber in the novel graphene composite fiber flame-retardant and comfortable fabric of the present invention is produced by an in-situ polymerization process, has permanent color and improved dyeing effect, and does not affect the color depth and color fastness after multiple washings.

[0020] 4) The novel flame-retardant and comfortable double-layer graphene composite fiber fabric of the present invention forms a special double-layer fabric structure by designing yarn raw materials, blended yarn ratio, yarn linear density, fabric density, and machine, grey cloth, and finished product specification parameters. After multiple washings, it still has good flame retardancy, functionality and comfort.

[0021] 5) The new graphene composite fiber flame-retardant and comfortable double-layer fabric made by the method of the present invention achieves excellent flame-retardant performance, high temperature resistance, comfortable wearing, moisture conduction and perspiration removal, antibacterial, and high-quality fabric effects. DETAILED DESCRIPTION

[0022] The following is only a preferred embodiment of the present invention, and the protection scope is not limited to this embodiment. All technical solutions under the concept of the present invention should belong to the protection scope of the present invention.

[0023] This embodiment discloses a novel flame-retardant and comfortable double-layer fabric of graphene composite fiber and a yarn production method thereof, wherein the outer layer of the fabric is 20% aramid 1313 fiber, 15% graphene composite flame-retardant polyester fiber and 65% wool, and the inner layer of the fabric is 49% polyimide staple fiber and 51% flame-retardant viscose staple fiber. The novel flame-retardant and comfortable double-layer fabric of graphene composite fiber is subjected to singeing, flat washing, soft drying, pre-shrinking, heat setting, and then double-sided weaving to obtain flame-retardant grey fabric of graphene composite fiber, and the grey fabric is subjected to a post-finishing process to obtain flame-retardant and comfortable double-layer fabric of graphene composite fiber.

[0024] Singeing: Use a gas singeing machine to singe the blended fabric, one front and one back, the down temperature is 300℃, the fabric temperature is 90℃, and the fabric temperature is 55℃ when the fabric is dropped.

[0025] Flat washing: The fabric is immersed in a solution containing detergent NF208 at 45°C and piled for 55 minutes to fully wash away the dust on the surface of the fabric; Soft drying: The fabric is driven by a large high-speed rotating drum, and the dry cloth hits it in an environment with a temperature of 125°C and a speed of 50m / min. The high-speed impact makes the fibers in the fabric fluffy and soft. The action time is 25 minutes, and the cloth loop length is 65m; Pre-shrinkage: After the fabric has been hit by dry cloth, remove the creases of the fabric under the conditions of steam volume 100kg / h, steam temperature 155℃, steam pressure 370kPa, and vehicle speed 30m / min; Heat setting: at a temperature of 110°C and a speed of 55m / min, use overfeeding, control the width to 145cm, and adjust the elongation; Finishing, cooking: Under the condition of solution temperature of 85℃ and pH of 7.5, cook the fabric for 75min, then wash and dry; Finishing, washing: Under the condition of solution temperature of 45℃, control the pH to 7.5, scour the fabric for 50 minutes, and control the bath ratio to 1:5, which is conducive to washing the fabric evenly; Finishing and shrinkage: At a temperature of 45°C, the radial shrinkage is controlled to be 5% and the weft shrinkage is 5%.

[0026] Finishing, dehydration and drying and width setting: the moisture content of the fabric after dehydration is controlled to be 25%, the drying temperature is 75℃, the speed is 15 m / min, and the moisture regain after drying is controlled to be 5%; Finishing and dyeing: Double dyeing process, disperse dyes and reactive dyes are used. Disperse dyes are used to dye flame-retardant graphene composite polyester, aramid 1313 and polyimide, with a bath ratio of 1:12 and a pH value of 8; 1.5 g / L of disperse dye is added, dyeing is carried out at a temperature of 55°C, and the temperature is raised to 150°C at a rate of 1.5°C / min. After dyeing, the dyeing is kept warm for 55 minutes, and then washed and dried; Finishing and dyeing: dye wool and viscose with reactive dyes, using 3% ammonium sulfate, 2.5% 70% acetic acid (owf), and 2.5% leveling agent (owf). Dye at 55°C, gradually heat to boiling, boil and dye for 50 minutes, cool to 80°C after dyeing, change water, add ammonia water to adjust pH to 8, and keep warm at 65°C for 20 minutes; Weaving specification parameters of the new graphene composite fiber flame-retardant and comfortable double-layer fabric: warp and weft blended yarn, yarn linear density warp 8.0tex, weft 8.5tex, fabric density warp 600 yarns / 10cm, weft 350 yarns / 10cm; The specifications of the new graphene composite fiber flame-retardant and comfortable double-layer fabric on the machine, grey cloth and finished product are as follows: the machine width is 175cm, the grey cloth width is 155cm, and the finished product width is 152cm; the grey cloth surface density is 175g / m2, and the finished product surface density is 185g / m2; the warping length is 20; the reed number is 113 teeth / 10cm, the number of threads inserted into each reed is 5, and the total number of threads is 9300; Flame retardant performance test of the new graphene composite fiber flame retardant and comfortable double-layer fabric: After testing by a third-party testing agency, the flame retardant properties of the fabrics meet the fabric index requirements in XF-10-2014 "Firefighter Firefighting Protective Clothing".

[0027] (1) The overall thermal protection performance TPP is 28.8 cal / cm2, and the sample has no melting, brittle cracking and shrinkage. It is evaluated as qualified.

[0028] (2) The radial afterburning time of the fabric is less than 2s, the damaged length is less than 100mm, and there is no melting or dripping. It is evaluated as qualified.

[0029] (3) The fabric weft-wise afterflaming time is less than 2s, the damaged length is less than 100mm, and there is no melting or dripping. It is considered qualified.

[0030] The design scheme of the one-way moisture conduction function of the new flame-retardant and comfortable double-layer fabric of graphene composite fiber is to increase the one-way moisture conduction performance through the post-finishing process; Functional effect test: After third-party testing, the moisture absorption and quick-drying properties of the fabric after 5 washes are in line with the requirements of GB / T21655.2 2019 Textiles Moisture Absorption and Quick-drying Property Assessment Part 2: Dynamic Moisture Transfer Method.

[0031] (1) Wetting time (before washing): the wetting time rating for the soaked surface is 4; the wetting time rating for the permeable surface is 5, indicating that the fabric Has excellent water absorption capacity.

[0032] (2) Wetting time (after washing 5 times): the wetting time of the soaked surface was rated as level 4; the wetting time of the permeable surface was rated as level 5, indicating that the fabric still has excellent water absorption capacity after multiple washings.

[0033] (3) Water absorption rate (before washing): the water-immersed surface test rating is 3; the permeable surface test rating is 4, indicating that the fabric absorbs water and perspiration quickly.

[0034] (4) Water absorption rate (after washing 5 times): the water immersion surface test rating is 3; the permeability surface test rating is 4, indicating that the fabric still has a good water absorption and perspiration removal rate after multiple washings.

[0035] (5) Maximum wetting radius of penetration surface (before washing), test rating is level 5.

[0036] (6) The maximum wetting radius of the penetration surface (after washing 5 times) is rated level 5.

[0037] (7) Liquid water diffusion rate on the penetration surface (before washing), the test rating is level 5.

[0038] (8) Liquid water diffusion rate on the penetration surface (after washing 5 times), the test rating is 5.

[0039] (9) The larger the value of the unidirectional moisture transfer index, the better the unidirectional moisture transfer performance. Generally, the unidirectional moisture transfer fabric is required to be ≥ level 3 (100-199). After 5 standard washes, the unidirectional moisture transfer index of the fabric in this embodiment is rated as level 5, which is very excellent.

[0040] This embodiment discloses a novel flame-retardant and comfortable double-layer fabric of graphene composite fiber and a yarn production method thereof, wherein the outer layer of the fabric is 20% aramid 1313 fiber, 15% graphene composite flame-retardant polyester fiber and 65% wool, and the inner layer of the fabric is 49% polyimide staple fiber and 51% flame-retardant viscose staple fiber. The novel flame-retardant and comfortable double-layer fabric of graphene composite fiber is subjected to singeing, flat washing, soft drying, pre-shrinking, heat setting, and then double-sided weaving to obtain flame-retardant grey fabric of graphene composite fiber, and the grey fabric is subjected to a post-finishing process to obtain flame-retardant and comfortable double-layer fabric of graphene composite fiber.

[0041] A novel flame-retardant and comfortable double-layer fabric made of graphene composite fiber, which is different from Example 1 in that the outer layer of the fabric is a blended yarn made of 25% aramid 1313 fiber, 10% graphene composite flame-retardant polyester fiber and 65% wool, and the inner layer of the fabric is a blended yarn made of 35% polyimide staple fiber and 65% flame-retardant viscose staple fiber. The rest is roughly the same as Example 1 and will not be repeated here. This embodiment discloses a novel flame-retardant and comfortable double-layer fabric of graphene composite fiber and a yarn production method thereof, wherein the outer layer of the fabric is a blended yarn of 25% aramid 1313 fiber, 10% graphene composite flame-retardant polyester fiber and 65% wool, and the inner layer of the fabric is a blended yarn of 35% polyimide staple fiber and 65% flame-retardant viscose staple fiber. The novel graphene unidirectional moisture-conducting fabric is made by double-sided weaving, singeing, desizing, scouring, bleaching, mercerizing and heat setting. In the post-finishing process, the unidirectional moisture-conducting grey fabric after weaving is bleached, opened and dyed.

[0042] The specific operation method of Example 2 is the same as that of Example 1, except that the ratio of the aramid 1313 fiber and the graphene composite flame-retardant polyester fiber in the outer layer of the fabric is different, and the ratio of the polyimide staple fiber and the flame-retardant viscose staple fiber in the inner layer is different.

[0043] Functional effect test: After third-party testing, the moisture absorption and quick-drying properties of the fabric after 5 washes are in line with the requirements of GB / T21655.2 2019 Textiles Moisture Absorption and Quick-drying Property Assessment Part 2: Dynamic Moisture Transfer Method.

[0044] The specific embodiments described above further illustrate the technical problems, technical solutions and beneficial effects solved by the present invention. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A novel flame-retardant and comfortable double-layer fabric made of graphene composite fiber, comprising a fabric body, wherein the fabric body comprises an outer layer fabric and an inner layer fabric, characterized in that: The outer fabric has a twill structure, and is woven from blended yarns of graphene composite flame-retardant polyester fiber, wool and aramid 1313 as fiber raw materials. The content of graphene composite flame-retardant polyester fiber in the outer fabric is not higher than 15wt%, the content of wool in the outer fabric is not higher than 65wt%, and the yarn count of the blended yarn in the outer fabric is 32~50S; the inner fabric is a unidirectional moisture-conducting fabric with flame-retardant function, and is woven from blended yarns of polyimide staple fiber and flame-retardant viscose staple fiber. The inner fabric has a plain weave structure, the content of polyimide staple fiber in the inner fabric is not higher than 50wt%, the content of flame-retardant viscose staple fiber in the inner fabric is not less than 50wt%, and the yarn count of the blended yarn in the inner fabric is 40~50S.

2. The method for preparing a novel flame-retardant and comfortable double-layer fabric made of graphene composite fiber according to claim 1, characterized in that: The following steps are included: S1: preparing an outer fabric, comprising at least 20wt% of aramid 1313 fiber, no more than 15wt% of graphene composite flame-retardant polyester fiber and no more than 65wt% of wool, through carding, drawing, roving, spinning and winding processes, to obtain a multifunctional twill serge structure with flame-retardant function; S2: To prepare the inner fabric, at least 50wt% of the flame retardant viscose staple fiber and no more than 50wt% of the polyimide staple fiber are prepared through the processes of needle combing, combing, drawing, roving, spinning and winding to obtain a hydrophobic layer with flame retardant function and unidirectional moisture conduction function; S3: Prepare flame-retardant and comfortable double-layer fabric of graphene composite fiber, connect the outer fabric and the inner fabric through fabric tissue points to obtain a blended fabric of flame-retardant graphene composite polyester fiber, wool, aramid 1313, polyimide and flame-retardant viscose, and then subject the blended fabric to singeing, flat washing, soft drying, pre-shrinking and heat setting to obtain flame-retardant grey cloth fabric of graphene composite fiber, and subject the grey cloth fabric to post-finishing process to obtain flame-retardant and comfortable graphene composite fiber fabric.

3. The method for preparing a novel flame-retardant and comfortable double-layer fabric of graphene composite fiber according to claim 2, characterized in that: The singeing treatment method in step S3 is: the blended fabric is singed by a gas singeing machine, with the fluff temperature being 300-600°C, the fabric body temperature being 80-110°C, and the fabric body temperature being 20-75°C when the fabric is dropped.

4. The method for preparing a novel flame-retardant and comfortable double-layer fabric of graphene composite fiber according to claim 2, characterized in that: The processing method of the flat wash in step S3 is: First, immerse the fabric in a solution containing detergent NF208 at 35-55°C for 15-100 minutes to fully wash away the dust on the surface of the fabric; The fabric is then soft-dried in the following manner: the fabric is driven by a large high-speed rotating drum and is hit by a dry cloth at a temperature of 100-135°C and a speed of 30-70m / min. The high-speed impact makes the fibers in the fabric fluffy and soft. The action time is 15-35min and the cloth loop length is 55-85m.

5. The method for preparing a novel flame-retardant and comfortable double-layer fabric of graphene composite fiber according to claim 2, characterized in that: The pre-shrinking treatment method in step S3 is: removing the fabric creases after the fabric is hit by the dry cloth under the conditions of steam volume 80-120 kg / h, steam temperature 100-175° C., steam pressure 300-500 kPa, and vehicle speed 10-50 m / min; The heat setting treatment method in step S3 is: under the conditions of temperature of 90-180° C. and vehicle speed of 30-70 m / min, overfeeding is adopted, the width is controlled to be 135-165 cm, and the elongation is adjusted.

6. The method for preparing a novel flame-retardant and comfortable double-layer fabric of graphene composite fiber according to claim 2, characterized in that: The post-finishing process in step S3 includes the following steps: S31: boiling, at a solution temperature of 75-105°C, controlling the pH value to 5.5-8.5, boiling the fabric for 15-100 minutes, and then washing and drying; S32: washing the fabric, at a solution temperature of 35-55°C, controlling the pH value to 5.5-10.5, scouring the fabric for 30-100 minutes, and controlling the bath ratio to 1:3-1:10, which is conducive to washing the fabric evenly; S33: Shrinkage, at a temperature of 30-60°C, the radial shrinkage is controlled to be 2%-8%, and the weft shrinkage is 3%-13%; S34: dehydration and drying and setting the width, controlling the moisture content of the fabric after dehydration to 20%~45%, under the condition of drying temperature of 65~95℃, the speed of 5~25 m / min, and controlling the moisture regain after drying to 5%~15%; S35 dyeing, the dyeing adopts double dyeing process, using disperse dyes and reactive dyes, including the following two processes: S351: Disperse dyes are used to dye flame-retardant graphene composite polyester, aramid 1313 and polyimide, with a bath ratio of 1: (10-20) and a pH value of the dye controlled at 7-10; 0.5-2.5 g / L of dispersant is added, dyeing is performed at a temperature of 25-95 °C, and the temperature is raised to 95-200 °C at a rate of 0.5-2.5 °C / min. After dyeing, the mixture is kept warm for 15-115 min, and then washed and dried; S352: Use reactive dyes to dye wool and viscose, use 2%~6% ammonium sulfate, 0.3%~3.5% (owf) 60%~90% acetic acid, and 0.5%~3.5% (owf) leveling agent. Dye at 35~75℃, gradually increase the temperature to boiling, boil and dye for 20~120min, cool to 70~90℃ after dyeing, change the water, add ammonia water to adjust the pH to 8~9, and keep warm at 50~80℃ for 10~30min.

7. The design scheme of weaving specification parameters of a novel flame-retardant and comfortable double-layer fabric made of graphene composite fiber according to claim 1 is characterized in that: The specifications include: Warp and weft blended yarn, yarn linear density warp 6.0~12.0tex, weft 6.2~12.2tex, fabric density warp 500~800 yarns / 10cm, weft 250~450 yarns / 10cm.

8. The design scheme of the specification parameters of the machine, grey cloth and finished product of the novel flame-retardant and comfortable double-layer graphene composite fiber fabric according to claim 1 is characterized in that: The specifications include: Machine width 155~185cm, grey fabric width 150~165cm, finished product width 150~155cm; grey fabric surface density 155~210g / m 2 , finished product surface density 155~205g / m 2 ; Warping length 18~25; Reed number 110~119 teeth / 10cm, 2~7 yarns inserted into each reed, total yarn number 5300~11300.

9. The design scheme of the one-way moisture conduction function of the novel flame-retardant and comfortable double-layer graphene composite fiber fabric according to claim 1 is characterized in that: The one-way moisture conduction performance is increased through post-finishing process.

10. The novel flame-retardant and comfortable double-layer fabric of graphene composite fiber according to claim 1 is used in the military, public security, petrochemical and other industries with flame-retardant requirements and in the field of professional clothing with flame-retardant and comfortable requirements.