High-strength flame-retardant fabric and method for manufacturing the same

Abstract

The present application relates to a kind of high-strength flame-retardant fabric and its preparation method, the high-strength flame-retardant fabric includes modified aramid fiber, modified flame-retardant cotton fiber, flame-retardant viscose fiber and modacrylic fiber, the modified aramid fiber includes modified meta-aramid fiber and modified para-aramid, according to percentage by weight:modified meta-aramid fiber 50-55%, modified flame-retardant cotton fiber 20-25%, flame-retardant viscose fiber 8-10%, modacrylic fiber 10-15% and para-aramid fiber 3-5%.The present application uses the combination of modified aramid fiber, modified flame-retardant cotton fiber, flame-retardant viscose fiber and modacrylic fiber, can effectively improve the tear strength of meta-aramid fiber by modification, using the combination of the above fiber, can effectively improve the dyeing property and comfort of flame-retardant fabric, the color fastness grade of the high-strength flame-retardant fiber prepared in the present application is 5 levels, the air permeability and moisture absorption have greatly improved, effectively improve the comfort of fabric.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of high-strength flame-retardant fabric suitable for fire-fighting clothes, belong to flame-retardant fabric field. BACKGROUND

[0002] Fire-fighting clothes is one of the important equipment for protecting the personal safety of firemen active in the first line of fire, it is not only indispensable necessary article for fire scene rescue, but also is the fire protection appliance for protecting the body of firemen from injury. Therefore, the fire-fighting clothes suitable for fire scene rescue activity is particularly important. From the protective nature, fire-fighting clothes has fire resistance, heat resistance and heat insulation, and also has strong toughness, prevents sharp object impact, collision, etc. Aramid fiber chemical name is polyphenylene terephthalamide, it is a new type of high-performance fiber, aramid fiber is divided into meta-aramid and para-aramid according to the different position of amide bond, meta-aramid is called "poly-m-phenylene isophthalamide", it has flame resistance, heat resistance and excellent chemical resistance, etc., so that meta-aramid is widely used in fire-fighting clothes. But meta-aramid fiber is connected by intramolecular covalent bond in axial direction, and connected by intermolecular hydrogen bond in transverse direction, hydrogen bond energy is much lower than covalent bond, so the mechanical properties of meta-aramid fiber in longitudinal and transverse directions are different, the strength in transverse direction is low, the strength in longitudinal direction is high, when the fiber is subjected to longitudinal tensile force, the fiber fracture surface will have splitting phenomenon, when the fiber is subjected to transverse tensile force, the fiber fracture surface will have delamination phenomenon, at the same time, meta-aramid has special aromatic ring space structure, hydrophilic functional group is less, and moisture absorption is poor, thereby affecting wearing comfort and application range. SUMMARY

[0003] The present application provides a kind of high-strength flame-retardant fabric and preparation method thereof, solve the existing aramid fiber transverse low strength, poor moisture absorption and other problems.

[0004] To solve the above technical problems, the technical scheme adopted by the present application is:

[0005] A kind of high-strength flame-retardant fabric, including modified aramid fiber, modified flame-retardant cotton fiber, flame-retardant viscose fiber and modacrylic fiber, the modified aramid fiber includes modified meta-aramid fiber and modified para-aramid, according to weight percentage: modified meta-aramid fiber 50-55%, modified flame-retardant cotton fiber 20-25%, flame-retardant viscose fiber 8-10%, modacrylic fiber 10-15% and modified para-aramid fiber 3-5%.

[0006] Further, preferably: according to weight percentage: modified meta-aramid fiber 50%, modified flame-retardant cotton fiber 25%, flame-retardant viscose fiber 10%, modacrylic fiber 12% and modified para-aramid fiber 3%.

[0007] Further, preferably: the preparation method of the modified aramid fiber, including the following steps:

[0008] (1) Put meta-aramid fiber and para-aramid fiber into anhydrous ethanol and ultrasonic vibration cleaning, clean the sizing agent on the surface of the fiber, and then ultrasonic vibration cleaning in deionized water to wash away the surface residual impurities;

[0009] (2) Add biological enzyme into ethanol solution with volume fraction of 40-60%, and prepare biological enzyme solution with weight fraction of 0.1-0.3%, then put meta-aramid fiber of step (1) into the biological enzyme solution and perform ultrasonic vibration modification treatment, and then ultrasonic vibration cleaning the treated aramid fiber sample in deionized water and dry for standby;

[0010] (3) Mix the treated meta-aramid fiber and para-aramid fiber uniformly, and spin;

[0011] (4) Mix epoxy resin, fumed silica and curing agent uniformly according to the weight ratio of 9:1:3, and ultrasonic treatment to obtain a modified liquid;

[0012] (5) Dip the spun aramid yarn into the modified liquid for 3-5 min, and then cure to obtain modified aramid yarn.

[0013] Further, preferably: the biological enzyme is desizing enzyme and cellulase, and the weight ratio is 2:1.

[0014] Further, preferably: in step (3), the working frequency of the ultrasonic vibration modification is 28KHz, the power is 300-400W, the amplitude is 40-50μm, and the time is 1-2h.

[0015] Further, preferably: the epoxy resin is high-temperature epoxy laminating resin, and the curing agent is aromatic amine curing agent.

[0016] Further, preferably: in the preparation step of the modified flame-retardant cotton fiber, the cotton fiber is soaked in a mixed solution of CP flame retardant and zirconium phosphate for 2-3h, and then dried to obtain the modified flame-retardant cotton fiber.

[0017] Further, preferably: in the mixed solution of CP flame retardant and zirconium phosphate, the weight ratio comprises 30-40% of CP flame retardant, 1-3% of zirconium phosphate, and the balance of water.

[0018] The preparation method of the high-strength flame-retardant fabric comprises the following steps:

[0019] (1) Spinning and weaving: mix the modified flame-retardant cotton fiber, flame-retardant viscose fiber and modacrylic fiber uniformly, spin to obtain yarn, and ply the obtained yarn with modified aramid yarn to form the final yarn;

[0020] (2) dyeing treatment is performed on the yarn;

[0021] (3) the dyed yarn is woven into cloth, and a high-strength flame-retardant fabric is obtained.

[0022] Further, preferably, the dyeing treatment is specifically: temperature: 120 DEG C; medium: water; pH value: 5.8; dye: disperse dye, 2-3% (o.w.f.); diffusing agent: CNF, 5 g / L; carrier: Cindye Dnk, 15 g / L; action time: 60 min, and the dyeing bath ratio is 1:15 respectively.

[0023] The beneficial effects of the present application are:

[0024] The flame-retardant viscose fiber has low smoke density after combustion, Dm4.0<=5; can maintain about 35% of the weight after 600 DEG C baking; can maintain the fabric skeleton shape after 1100 DEG C high-temperature burning, and form a shielding layer; the fiber has the characteristics of high moisture regain of general viscose, and is comfortable to the human body and friendly to the human skin.

[0025] The modacrylic fiber has excellent flame-retardant performance, and still has unchanged flame-retardant performance when blended with other natural fibers; has the general softness, natural hand feeling, water absorption performance and comfort of other natural fibers; the modacrylic fabric has no shrinkage and melting phenomenon during combustion, and only carbonization occurs, thereby effectively preventing the burning and dripping from burning the skin.

[0026] The main outstanding advantages of the para-aramid fiber are high strength and high modulus, and the tensile strength is 6 times that of steel wire, and the tensile modulus is 2-3 times that of steel wire and glass fiber.

[0027] The cotton fabric has good moisture absorption and air permeability, is comfortable to wear, has soft hand feeling, soft and simple luster, good dyeing property and bright color. The modified flame-retardant cotton fiber has good softness and comfort, and the mixed modacrylic fiber can maintain good elasticity and comfort.

[0028] The present application adopts the combination of the modified aramid fiber, the modified flame-retardant cotton fiber, the flame-retardant viscose fiber and the modacrylic fiber, the tear strength of the meta-aramid fiber can be effectively improved through modification, the dyeing property and comfort of the flame-retardant fabric can be effectively improved by using the combination of the above fibers, the color fastness grade of the high-strength flame-retardant fiber prepared by the present application is 5, the air permeability and moisture absorption are greatly improved, and the comfort of the fabric is effectively improved. The flame-retardant fabric of the present application has good stability and corrosion resistance under the action of chemicals, and can adapt to complex working environments.

[0029] The meta-aramid of the present application adopts a composite modification method of ultrasonic wave and biological enzyme to perform surface modification on the meta-aramid, and has the following advantages: (1) compared with single ultrasonic wave modification, the ultrasonic wave time is more than 6 hours, which greatly shortens the processing time and effectively reduces the energy consumption, and meanwhile, compared with single modification, the modified meta-aramid is better combined with resin and fumed silica, so that the flame retardance and shear strength of the product can be effectively improved;

[0030] (2) the ultrasonic wave can produce violent mechanical vibration and liquid flow, which can effectively promote the diffusion and penetration of the enzyme on the fiber surface, improve the contact efficiency and reaction speed of the enzyme, and thus enhance the modification effect.

[0031] (3) uniformity is improved: the ultrasonic wave forms a uniform diffusion layer on the fiber surface through the generation of uniform micro-bubbles and strong vortex effect, so that the enzyme can be more uniformly distributed on the fiber, and the uniformity of the modification is improved.

[0032] (4) the performance of the fiber is improved: the biological enzyme can perform specific modification and modification on the fiber, so that the fiber has better performance, such as increased corrosion resistance, flame retardance, wear resistance, etc., and the functionality of the fiber is improved.

[0033] The present application adopts high-temperature epoxy laminate resin, m-xylylenediamine and fumed silica for modification treatment, the fumed silica has large specific surface area, strong surface adsorption, large surface energy, high chemical purity, good dispersion performance, and specific performance in terms of thermal resistance, electrical resistance, etc., the m-xylylenediamine as an organic flame retardant can improve the flame retardance of aramid fiber, effectively reduce the fire risk, and slow down the spreading speed of the flame, the use of high-temperature epoxy laminate resin can improve the high-temperature resistance of the fiber, so that it can maintain stability in a high-temperature environment and is not easy to melt or deform. The fumed silica together with the high-temperature epoxy laminate resin and the m-xylylenediamine can effectively improve the strength of the meta-aramid, and at the same time, impart the meta-aramid with ultraviolet resistance and antibacterial performance. Compared with the fabric without modification treatment, the tear strength is improved by more than 40%. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 It is a structural diagram of the modified curing device of the present application. DETAILED DESCRIPTION

[0035] The technical solutions of the present application will be described clearly and completely below by combining the embodiments of the present application and the drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0036] Example 1

[0037] A high-strength flame-retardant fabric, comprising modified aramid fibers, modified flame-retardant cotton fibers, flame-retardant viscose fibers and modacrylic fibers, wherein the modified aramid fibers comprise modified meta-aramid fibers and modified para-aramid fibers, and the modified aramid fibers, the modified flame-retardant cotton fibers, the flame-retardant viscose fibers and the modacrylic fibers are in a weight percentage of 50%, 25%, 10%, 12% and 3% respectively;

[0038] The working frequency of the ultrasonic wave used in the preparation method of the modified aramid fibers is 28 KHz, the power is 380 W, and the amplitude is 45 μm, and the method comprises the following steps:

[0039] (1) Aramid 1313 (Yantai Taihe New Material, thickness = 1.67D, length: 38 mm) and aramid 1414 fibers (Yantai Taihe New Material, thickness = 1.67D, length: 38 mm) are respectively placed in anhydrous ethanol for ultrasonic vibration cleaning, and the sizing agent on the surface of the fibers is cleaned for 30 min, and then the surface residual impurities are washed away in deionized water by ultrasonic vibration cleaning;

[0040] (2) The biological enzyme is added to a 60% ethanol solution to prepare a 0.1% biological enzyme solution by weight, and then clean aramid fibers are placed in the biological enzyme solution for ultrasonic vibration modification treatment for 1 h, and the treated aramid fiber samples are ultrasonically cleaned in deionized water, dried, and reserved for use, wherein the biological enzyme is desizing enzyme and cellulase, and the weight ratio of the desizing enzyme to the cellulase is 2:1, the desizing enzyme used is low-temperature desizing enzyme LTDE from Zhejiang Jingye Biochemical Co., Ltd., and the activity of the cellulase used is 11,000 u / g;

[0041] (3) The treated meta-aramid fibers and para-aramid fibers are mixed uniformly and spun;

[0042] (4) Epoxy resin, fumed silica and curing agent are mixed uniformly in a weight ratio of 9:1:3, and ultrasonic treatment is performed for 30 min to obtain a modification liquid, wherein the epoxy resin is high-temperature epoxy laminating resin (easycomposites), the fumed silica is Wacker HDK H17, and the curing agent is m-xylylenediamine.

[0043] (5) The spun aramid yarn is immersed in the modification liquid for 5 min, and then cured at 100°C for 10 min to obtain modified aramid yarn, and the specific modification operation device is shown in Figure 1 The size of the modification liquid tank, the length of the curing box and the speed of the winding machine are set so that the aramid yarn passes through the pressure roller, the modification liquid tank, the extrusion roller and the curing box in sequence at a certain speed, so that the aramid fiber stays in the modification liquid tank for 5 min and stays in the curing box for 10 min, and the speed of the winding machine in this embodiment is 5 m / min.

[0044] The preparation steps of modified flame-retardant cotton fiber are as follows: cotton fiber (coarseness: 1.2D, length = 38mm, long-staple cotton) is soaked in a mixed solution of durable flame retardant CP (Jiangyin Yingjie Chemical Co., Ltd.) and zirconium phosphate for 3 hours, and then dried to obtain flame-retardant modified cotton fiber; the mixed solution of CP flame retardant and zirconium phosphate includes 30% CP flame retardant, 2% zirconium phosphate, and the balance being water, by weight ratio.

[0045] Its preparation method includes the following steps:

[0046] (1) Spinning and weaving: Modified flame-retardant cotton fiber and flame-retardant viscose fiber (from Beijing Saiolan Company) Flame-retardant viscose fiber and acrylonitrile fiber (fineness: 1.5D, length: 38-40mm, oxygen index above 32) are mixed evenly, spun to obtain yarn, and the obtained yarn is twisted together with modified aramid yarn to form the final yarn.

[0047] (2) The yarn is dyed using an IR-12 infrared dyeing machine. The dyeing process is as follows: temperature: 120℃; medium: water; pH: 5.8; dye: Disperse Brilliant Red SF-B (200%), 2-3% (owf); dispersing agent: CNF, 5g / L; carrier: Cindye Dnk, 15g / L; reaction time: 60min; dye bath ratio: 1:15. Heating process: the temperature is increased from room temperature to 120℃ at a rate of 2℃ / min, then kept at that temperature for 60min, and finally cooled to room temperature. After washing with water, soaping, and washing again, the dyeing process is completed.

[0048] (3) Weave the dyed yarn into fabric with the following yarn count: 36s / 2*36s / 2; density: 88*55 (threads / inch); texture: 4 / 1 satin; weaving machine: arrow loom. Finish and inspect the woven fabric to obtain high-strength flame-retardant fabric.

[0049] Example 2

[0050] A high-strength flame-retardant fabric includes modified aramid fibers, modified flame-retardant cotton fibers, flame-retardant viscose fibers, and acrylonitrile fibers. The modified aramid fibers include modified meta-aramid fibers and modified para-aramid fibers, with the following weight percentages: 53% modified meta-aramid fibers, 22% modified flame-retardant cotton fibers, 9% flame-retardant viscose fibers, 11% acrylonitrile fibers, and 5% modified para-aramid fibers. The specific steps are the same as in Example 1.

[0051] Example 3

[0052] A high-strength flame-retardant fabric comprises modified aramid fiber, modified flame-retardant cotton fiber, flame-retardant viscose fiber and modacrylic fiber, the modified aramid fiber comprises modified meta-aramid fiber and modified para-aramid fiber, and the weight percentage is as follows: modified meta-aramid fiber 52%, modified flame-retardant cotton fiber 22%, flame-retardant viscose fiber 9%, modacrylic fiber 13% and modified para-aramid fiber 4%; the specific steps are the same as those in Example 1.

[0053] Example 4

[0054] A high-strength flame-retardant fabric comprises modified aramid fiber, modified flame-retardant cotton fiber, flame-retardant viscose fiber and modacrylic fiber, the modified aramid fiber comprises modified meta-aramid fiber and modified para-aramid fiber, and the weight percentage is as follows: modified meta-aramid fiber 51%, modified flame-retardant cotton fiber 20%, flame-retardant viscose fiber 9%, modacrylic fiber 15% and modified para-aramid fiber 5%; the specific steps are the same as those in Example 1.

[0055] Example 5

[0056] A high-strength flame-retardant fabric comprises modified aramid fiber, modified flame-retardant cotton fiber, flame-retardant viscose fiber and modacrylic fiber, the modified aramid fiber comprises modified meta-aramid fiber and modified para-aramid fiber, and the weight percentage is as follows: modified meta-aramid fiber 54%, modified flame-retardant cotton fiber 20%, flame-retardant viscose fiber 8%, modacrylic fiber 13% and modified para-aramid fiber 5%; the specific steps are the same as those in Example 1.

[0057] Example 6

[0058] A high-strength flame-retardant fabric comprises modified aramid fiber, modified flame-retardant cotton fiber, flame-retardant viscose fiber and modacrylic fiber, the modified aramid fiber comprises modified meta-aramid fiber and modified para-aramid fiber, and the weight percentage is as follows: modified meta-aramid fiber 55%, modified flame-retardant cotton fiber 21%, flame-retardant viscose fiber 10%, modacrylic fiber 11% and modified para-aramid fiber 3%; the specific steps are the same as those in Example 1.

[0059] Comparative Example 1

[0060] The same as Example 1, except that a high-strength flame-retardant fabric comprises modified aramid fiber and modified flame-retardant cotton fiber, the modified aramid fiber comprises modified meta-aramid fiber and modified para-aramid fiber, and the weight percentage is as follows: modified meta-aramid fiber 65%, modified flame-retardant cotton fiber 31% and modified para-aramid fiber 4%;

[0061] Comparative Example 2

[0062] The same as example 1, except that: a high-strength flame-retardant fabric, comprising modified aramid fiber, modified flame-retardant cotton fiber and modacrylic fiber, the modified aramid fiber comprising modified meta-aramid fiber and modified para-aramid, according to the percentage by weight: modified meta-aramid fiber 52%, modified flame-retardant cotton fiber 31%, modacrylic fiber 13% and modified para-aramid fiber 4%.

[0063] Comparative example 3

[0064] The same as example 1, except that: a high-strength flame-retardant fabric, comprising modified aramid fiber, modified flame-retardant cotton fiber and flame-retardant viscose fiber, the modified aramid fiber comprising modified meta-aramid fiber and modified para-aramid, according to the percentage by weight: modified meta-aramid fiber 65%, modified flame-retardant cotton fiber 22%, flame-retardant viscose fiber 9% and modified para-aramid fiber 4%.

[0065] Comparative example 4

[0066] The same as example 1, except that: the meta-aramid fiber and para-aramid fiber are not modified.

[0067] Comparative example 5

[0068] The same as example 1, except that: a single ultrasonic wave is used for modification treatment, as follows:

[0069] The working frequency of the ultrasonic wave used in the preparation method of the modified aramid fiber: 28KHz, power: 380W; amplitude: 45μm, comprising the following steps:

[0070] (1) Put 1.5D aramid 1313 fiber 6mm chopped strand and 1.5D aramid 1414 fiber 6mm chopped strand into anhydrous ethanol ultrasonic vibration cleaning respectively, clean the sizing agent on the fiber surface, for 30min, then ultrasonic vibration cleaning in deionized water to wash off the surface residual impurities;

[0071] (2) Put clean aramid fiber into a 60% ethanol solution, ultrasonic vibration modification treatment for 1h, the treated aramid fiber sample is ultrasonic vibration cleaned in deionized water, dried and ready for use;

[0072] (3) Mix the treated meta-aramid fiber and para-aramid fiber evenly and spin;

[0073] (4) The epoxy resin, fumed silica and curing agent are mixed uniformly in a proportion of 9:1:3 by weight, ultrasonic treatment, 30 min, to obtain a modified liquid, the epoxy resin is high-temperature epoxy laminating resin (easy composites); the fumed silica is Wacker, model: HDK H17, and the curing agent is m-xylylenediamine.

[0074] (5) The spun aramid yarn is immersed in the modified liquid for 5 min, and then cured at 60°C for 2 h to obtain a modified aramid yarn.

[0075] Comparative Example 6

[0076] The same as Example 1, except that a single biological enzyme is used for modification treatment, as follows:

[0077] The working frequency of the ultrasonic wave used in the preparation method of the modified aramid fiber is 28 KHz, the power is 380 W, and the amplitude is 45 μm, including the following steps:

[0078] (1) 6 mm chopped strands of 1.5D aramid 1313 fiber and 6 mm chopped strands of 1.5D aramid 1414 fiber are respectively placed in anhydrous ethanol for ultrasonic vibration cleaning to clean the sizing agent on the fiber surface, for 30 min, and then ultrasonic vibration cleaning in deionized water to wash off the surface impurities;

[0079] (2) The biological enzyme is added to a 60% ethanol solution to prepare a 0.1% biological enzyme solution by weight, and then clean aramid fiber is placed in the biological enzyme solution for 1 h, and the treated aramid fiber sample is washed in deionized water and dried for use, the biological enzyme is desizing enzyme and cellulase, the weight ratio is 2:1, the desizing enzyme used is low-temperature desizing enzyme LTDE from Zhejiang Jingye Biochemical Co., Ltd., and the activity of the cellulase used is 11,000 u / g;

[0080] (3) The treated meta-aramid fiber and para-aramid fiber are mixed uniformly and spun;

[0081] (4) The epoxy resin, fumed silica and curing agent are mixed uniformly in a proportion of 9:1:3 by weight, ultrasonic treatment, 30 min, to obtain a modified liquid, the epoxy resin is high-temperature epoxy laminating resin (easy composites); the fumed silica is Wacker, model: HDK H17; and the curing agent is m-xylylenediamine.

[0082] (5) The spun aramid yarn is immersed in the modified liquid for 5 min, and then cured at 60°C for 2 h to obtain a modified aramid yarn.

[0083] Comparative Example 7

[0084] The same as example 1, the difference is that: the modification treatment does not use fumed silica, specifically:

[0085] The working frequency of the ultrasonic wave used in the preparation method of the modified aramid fiber is 28KHz, the power is 380W, and the amplitude is 45μm, including the following steps:

[0086] (1) Put 1.5D aramid 1313 and 1.5D aramid 1414 into anhydrous ethanol ultrasonic vibration cleaning respectively, clean the sizing agent on the fiber surface, the time is 30min, then ultrasonic vibration cleaning in deionized water to wash away the surface impurities;

[0087] (2) Add biological enzyme into 60% ethanol solution, prepare 0.1% biological enzyme solution by weight, then take clean aramid fiber into the biological enzyme solution, ultrasonic vibration modification treatment for 1h, the treated aramid fiber sample is ultrasonic vibration cleaned in deionized water, dried and ready for use, the biological enzyme is desizing enzyme and cellulase, the weight ratio is 2:1, the desizing enzyme used is low-temperature desizing enzyme LTDE of Zhejiang Jingye Biochemical Co., Ltd., and the activity of cellulase used is 11,000u / g;

[0088] (3) Mix the treated meta-aramid fiber and para-aramid fiber evenly and spin;

[0089] (4) Mix epoxy resin and curing agent evenly according to the weight ratio of 9:3, ultrasonic treatment for 30min to obtain modified liquid, the epoxy resin is high-temperature epoxy laminating resin (easy composites), the fumed silica is Wacker HDK H17, and the curing agent is m-xylylenediamine.

[0090] (5) Dip the spun aramid yarn in the modified liquid for 5min, then cure at 60℃ for 2h to obtain modified aramid yarn.

[0091] Performance test of high-strength flame-retardant fabric

[0092] The prepared high-strength flame-retardant fabric was tested according to GB 8965.1-2020 Method for Flame Retardant Clothing, and the specific data of the fabric flame retardant performance is shown in Table 1.

[0093] Table 1 Standard and test data of fabric flame retardant performance

[0094]

[0095] From table 1, the high-strength flame-retardant fabric of the present application effectively improves the thermal protection performance of the fabric through the combination of different fibers and the modification of aramid fibers, while overcoming the problem that the existing aramid modification treatment reduces the flame retardance and strength of aramid itself. The flame retardance of the modified aramid fiber is improved compared to that without modification.

[0096] The prepared high-strength flame-retardant fabric was determined according to the method of GB 8965.1-2020 flame-retardant clothing, and the specific data of the physicochemical properties of the fabric are shown in table 2.

[0097] Table 1 physicochemical property standards and determination data

[0098]

[0099]

[0100] From table 2, the high-strength flame-retardant fabric of the present application effectively improves the color fastness, air permeability and moisture permeability of aramid fiber through the combination of different fibers and the modification of aramid fiber, and overcomes the problems of difficult dyeing and poor air permeability of aramid fiber, effectively improving the comfort of the fabric.

[0101] At the same time, the modified treatment effectively improves the breaking strength and tearing strength of the fabric, especially the tearing strength, which is improved by more than 40%.

[0102] Although the embodiments of the present application have been described above, modifications and replacements made by those skilled in the art without departing from the principles and spirits of the present application shall fall within the scope of the present application.

Claims

1. A high-strength flame resistant fabric characterized in that: The modified aramid fiber, the modified flame-retardant cotton fiber, the flame-retardant viscose fiber and the modacrylic fiber, the modified aramid fiber comprises modified meta-aramid fiber and modified para-aramid fiber, and the modified aramid fiber comprises 50-55% of the modified meta-aramid fiber, 20-25% of the modified flame-retardant cotton fiber, 8-10% of the flame-retardant viscose fiber, 10-15% of the modacrylic fiber and 3-5% of the modified para-aramid fiber according to the weight percentage; The preparation method of the modified aramid fiber comprises the following steps: (1) The meta-aramid fiber and the para-aramid fiber are put into anhydrous ethanol for ultrasonic vibration cleaning to clean the sizing agent on the fiber surface, and then the fiber is cleaned in deionized water by ultrasonic vibration to wash away the surface residual impurities; (2) The biological enzyme is added into an ethanol solution with a volume fraction of 40-60% to prepare a biological enzyme solution with a weight fraction of 0.1-0.3%, and then the meta-aramid fiber and the para-aramid obtained in step (1) are put into the biological enzyme solution for ultrasonic vibration modification treatment, and the treated aramid fiber sample is cleaned in deionized water by ultrasonic vibration and dried for standby use; (3) The treated meta-aramid fiber and para-aramid fiber are mixed uniformly, and then spun to obtain aramid yarn; (4) The epoxy resin, the fumed silica and the curing agent are mixed uniformly according to the weight ratio of 9:1:3, and then ultrasonic treated to obtain a modified liquid; (5) The spun aramid yarn is immersed in the modified liquid for 3-5 min, and then cured to obtain the modified aramid yarn; The biological enzyme is desizing enzyme and cellulase, and the weight ratio is 2:1; the epoxy resin is high-temperature epoxy lamination resin; and the curing agent is aromatic amine curing agent; The preparation steps of the modified flame-retardant cotton fiber are as follows: the cotton fiber is soaked in a mixed solution of CP flame retardant and zirconium phosphate for 2-3 h, and then dried to obtain the modified flame-retardant cotton fiber.

2. A high-strength flame resistant fabric according to claim 1, wherein: The modified meta-aramid fiber is 50%, the modified flame-retardant cotton fiber is 25%, the flame-retardant viscose fiber is 10%, the modacrylic fiber is 12% and the modified para-aramid fiber is 3% according to the weight percentage.

3. A high-strength flame resistant fabric according to claim 1, wherein: In step (3), the working frequency of the ultrasonic vibration modification is 28KHz, the power is 300-400W, the amplitude is 40-50μm and the time is 1-2h. The CP flame retardant and the zirconium phosphate mixed solution comprises the CP flame retardant 30-40%, the zirconium phosphate 1-3% and the balance of water according to the weight ratio.

4. A high-strength flame resistant fabric according to claim 1, wherein: The preparation method comprises the following steps:

5. A process for the production of a high-strength flame resistant fabric as claimed in any one of claims 1 to 4, characterised in that: (1) Spinning and weaving: the modified flame-retardant cotton fiber, the flame-retardant viscose fiber and the modacrylic fiber are mixed uniformly, and then spun to obtain yarn, and the obtained yarn is plied with the modified aramid yarn to form the final yarn; (2) The yarn is subjected to dyeing treatment; (3) The dyed yarn is woven to obtain the high-strength flame-retardant fabric. The dyeing treatment is specifically as follows: temperature: 120℃; medium: water; pH value: 5.8; dye: disperse dye, 2-3% (o.w.f.); diffusing agent: 5g / L; carrier: Cindye Dnk, 15g / L; action time: 60min, and the dyeing bath ratio is 1:

15.

6. A process for the preparation of a high strength flame resistant fabric according to claim 5, characterized in that: ​ ​ ​

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