Preparation process of flame retardant antistatic jacket

Abstract

The invention discloses a preparation process of a flame-retardant and antistatic assault jacket, comprising: pre-treating a carbon nanotube / polymer nanofiber composite spiral yarn, mixing and drawing the flame-retardant viscose fiber and the carbon nanotube / polymer nanofiber composite spiral yarn, twisting, and winding to obtain a composite yarn with high stability; mixing and drawing the composite yarn with aramid and conductive fibers, twisting, and winding to obtain a composite textile yarn with high tensile strength and stability; mixing a phosphorus-containing compound, a nitrogen-containing compound, triethylamine, ethanol, and water, and adding a catalyst for reaction; thereby effectively limiting the expansion and deformation of the fiber in water, further greatly reducing the swelling degree of the fiber, so that the composite yarn maintains higher structural stability and dimensional stability during the washing process, prolonging the service life of the product, and ensuring the durability of the flame-retardant performance.

Description

Technical Field

[0001] The invention relates to the field related to the preparation of a flame-retardant and antistatic jacket, and in particular to a preparation process of a flame-retardant and antistatic jacket. Background Art

[0002] As outdoor sports and special working environments continue to increase the requirements for clothing performance, flame retardant and antistatic jackets have gradually become popular products on the market. This type of jacket not only has the waterproof, breathable, and warm functions of traditional jackets, but also has flame retardant and antistatic properties, providing more comprehensive protection for the wearer. In the design and manufacturing process of flame retardant and antistatic jackets, multiple factors need to be considered comprehensively. For example, the selection of fabrics needs to take into account both flame retardancy and wearing comfort; the structural design of clothing needs to take into account ergonomics and sports needs; the production process needs to ensure that the performance of fabrics and clothing is stable and reliable.

[0003] However, in the prior art, flame-retardant viscose fibers are mostly used to prepare flame-retardant antistatic jackets. Flame-retardant viscose fibers contain a large number of hydrophilic hydroxyl groups in their molecular structure, which easily form hydrogen bonds with water molecules, causing the fibers to swell during washing. Long-term washing will aggravate this swelling phenomenon, causing changes in the physical structure and chemical properties of the fibers. As the flame-retardant viscose fibers swell, the gaps between the fibers will increase significantly. These gaps provide more channels and spaces for the loss or volatilization of flame retardants. The originally tightly arranged fibers become loose after swelling, and flame retardant molecules are more likely to escape from these gaps. When the gaps increase, the binding force of the flame retardant molecules inside the fibers is weakened, and they are more susceptible to the influence of the external environment (such as temperature, humidity, etc.) and are lost or volatilized. In addition, mechanical friction and chemical reactions during the washing process may also accelerate the loss of flame retardants, thereby reducing flame retardant properties. Summary of the invention

[0004] The invention overcomes the shortcomings of the prior art and provides a preparation process of a flame-retardant and antistatic jacket.

[0005] To achieve the above object, the technical solution adopted by the present invention is: a preparation process of a flame retardant and antistatic jacket, comprising the following steps:

[0006] S1: pretreating the carbon nanotube / polymer nanofiber composite spiral yarn, mixing and drawing the flame-retardant viscose fiber and the carbon nanotube / polymer nanofiber composite spiral yarn, twisting, and winding to obtain a composite yarn with high stability;

[0007] S2: The composite yarn is mixed with aramid and conductive fibers, twisted, and wound to obtain a composite textile yarn with high tensile strength and stability;

[0008] S3: mixing a phosphorus-containing compound, a nitrogen-containing compound, triethylamine, ethanol and water, adding a catalyst for reaction, mixing and impregnating the composite textile yarn to generate new covalent bonds, and drying to obtain a flame-retardant yarn;

[0009] S4: Use flame retardant yarn to knit into the jacket.

[0010] In a preferred embodiment of the present invention, in S1, the diameter of the carbon nanotube / polymer nanofiber composite spiral yarn is 50-100 μm, the length of the flame retardant viscose fiber is 28-51 mm, and the linear density is 1.5-3.0 denier.

[0011] In a preferred embodiment of the present invention, in S1, the mixing ratio of flame-retardant viscose fiber and composite spiral yarn is 5-7:3-5, the number of drawing passes is 4-6, the drawing frame speed is 20-30m / min, the twisting is firstly prepared by coarse yarn and then prepared by fine yarn, and the winding speed is 400-600m / min.

[0012] In a preferred embodiment of the present invention, the specific steps of twisting are: first prepare coarse yarn, with a drafting multiple of 1.2-1.5 times, a twisting degree of 80-120 twists / m, and a coarse yarn frame speed of 10-15m / min, and then prepare fine yarn, with a drafting multiple of 1.6-2.0 times, a twisting degree of 150-200 twists / m, and a fine yarn frame speed of 25-35m / min.

[0013] In a preferred embodiment of the present invention, in S1, the pretreatment is specifically: subjecting the spiral yarn to plasma treatment to change the fiber surface energy, the time is 2-5 minutes, the power is 40-50w, and the surface of the spiral yarn is modified using a coupling agent, the time is 30-40 minutes, the temperature is 60-65°C, and the coupling agent concentration is 1%-2%.

[0014] In a preferred embodiment of the present invention, in S2, the conductive fiber is selected from a mixed conductive polymer fiber, graphene fiber and metal nanofiber, and the drawing parameters are that the ratio of composite yarn to aramid and conductive fiber is 6-8:2:1, the number of drawing paths is 4-6, the drawing speed is 20-30m / min, and the twisting is to first make the product after drawing into coarse yarn, then prepare it into fine yarn, and finally wind it into shape, and the winding speed is 20-30m / min.

[0015] In a preferred embodiment of the present invention, the roving is made specifically by feeding the mixed and drawn fibers into a roving frame for stretching and twisting, with parameters of a stretching multiple of 1.2-1.5 times, a twist of 80-120 twists / m, and a roving frame speed of 10-15m / min; the spun yarn is made specifically by feeding the roving product into a spun yarn frame for stretching and twisting again, with parameters of a twisting multiple of 1.5-2 times, and a twist of 150-200 twists / m.

[0016] In a preferred embodiment of the present invention, in S3, the phosphorus-containing compound is selected from spirocyclic phosphate dichloride, metaphosphate and hydrogen phosphate, the nitrogen-containing compound is selected from polyetheramine, nitrogen dioxide and nitrogen pentoxide, and the ratio of the phosphorus-containing compound, the nitrogen-containing compound, triethylamine, ethanol and water is 30-50:20-40:10:15:5.

[0017] In a preferred embodiment of the present invention, in S3, the catalyst is acetic acid, and the added amount accounts for 2%-5% of the total mass of the reactants.

[0018] In a preferred embodiment of the present invention, in S3, the immersion temperature is 70-80°C, the time is 20-25 min, and the drying temperature is 70-80°C, the time is 10-15 min.

[0019] The present invention solves the defects existing in the background technology and has the following beneficial effects:

[0020] (1) The present invention provides a process for preparing a flame-retardant and antistatic jacket, wherein the flame-retardant viscose fiber is tightly wound around the outside of the carbon nanotube / polymer nanofiber composite spiral yarn at a 45° angle to form a tight wrapping layer, which significantly enhances the interaction between the fibers. This unique spiral winding structure not only greatly reduces the gaps between the fibers, but also increases the contact area between the fibers, thereby effectively limiting the expansion and deformation of the fibers in water, further significantly reducing the swelling degree of the fibers, and allowing the composite yarn to maintain higher structural stability and dimensional stability during the washing process, thereby extending the service life of the product and ensuring the durability of the flame retardant performance.

[0021] (2) The present invention provides a process for preparing a flame-retardant and antistatic jacket, wherein the phosphate groups in the flame-retardant liquid react with the hydroxyl groups in the aramid fiber to form an ester bond, which is a stable covalent bond. At the same time, the active free radicals in the flame-retardant liquid react with the unsaturated bonds in the aramid fiber to further consolidate the bond between the flame retardant and the fiber. Through this deep chemical bonding, the flame-retardant liquid can be firmly attached to the surface of the aramid fiber to form a flame-retardant protective layer that is difficult to peel off. This strong bonding greatly improves the water-washing resistance of the flame-retardant textile. Even after repeated washing and friction, the flame retardant is not easy to fall off from the fiber surface or be washed away by water. This not only ensures the long-lasting stability of the flame-retardant performance, but also extends the service life of the flame-retardant textile.

[0022] (3) The present invention provides a preparation process for a flame-retardant and antistatic jacket, wherein the flame-retardant viscose fiber is tightly wound around the outside of a carbon nanotube / polymer nanofiber composite spiral yarn in a spiral shape at an angle of 45° and combined with an aramid fiber impregnated with a flame-retardant liquid. This not only enhances the mutual entanglement and contact between the fibers, but also greatly reduces the gaps between the fibers, thereby providing an effective physical barrier for water penetration and diffusion. At the same time, after the aramid fiber is impregnated with a flame-retardant liquid, a stable covalent bond is formed between the surface and the interior of the aramid fiber and the flame retardant. This strong bond effectively prevents the flame retardant from falling off during the washing process, thereby ensuring the long-term stability of the flame retardant performance. When the flame retardant textile faces water penetration, it can more effectively resist the swelling and deformation of the fiber, thereby not only extending the service life of the flame retardant textile, but also ensuring that it can still maintain good flame retardant performance and structural stability after multiple washings. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 It is a three-dimensional structural diagram of a preferred embodiment of the present invention. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0027] like Figure 1 As shown, a preparation process of a flame retardant and antistatic jacket comprises the following steps:

[0028] S1: pretreating the carbon nanotube / polymer nanofiber composite spiral yarn, mixing and drawing the flame-retardant viscose fiber and the carbon nanotube / polymer nanofiber composite spiral yarn, twisting, and winding to obtain a composite yarn with high stability;

[0029] In the present invention, in S1, the diameter of the carbon nanotube / polymer nanofiber composite spiral yarn is 50-100 μm, the length of the flame retardant viscose fiber is 28-51 mm, and the linear density is 1.5-3.0 denier; the pretreatment is specifically: the spiral yarn is subjected to plasma treatment to change the fiber surface energy, the time is 2-5 min, the power is 40-50 w, the surface of the spiral yarn is modified by using a coupling agent, the time is 30-40 min, the temperature is 60-65 ° C, and the coupling agent concentration is 1%-2%; in S1, the flame retardant viscose fiber and the composite spiral yarn The mixing ratio is 5-7:3-5, the number of drawing passes is 4-6, the drawing frame speed is 20-30m / min, the twisting is to prepare the coarse yarn first, and then prepare the fine yarn, and the winding speed is 400-600m / min; the specific steps of twisting are: first prepare the coarse yarn, the drafting multiple is 1.2-1.5 times, the twisting degree is 80-120 twists / meter, the coarse yarn frame speed is 10-15m / min, and then prepare the fine yarn, the drafting multiple is 1.6-2.0 times, the twisting degree is 150-200 twists / meter, and the fine yarn frame speed is 25-35m / min.

[0030] It should be noted that the carbon nanotube / polymer nanofiber composite spiral yarn selects carbon nanotubes (CNTs) to be evenly distributed in the yarn, with a stable spiral structure, a yarn diameter of 50-100 microns, and flame-retardant viscose fibers with a fiber length of 38-51 mm and a linear density of 1.5-3.0 denier. The composite spiral yarn is pretreated with plasma treatment technology for 2 minutes at a power of 50W to improve the fiber surface energy, and then modified with a coupling agent (i.e., a silane coupling agent) for 30 minutes at a temperature of 60°C and a coupling agent concentration of 1%-2%.

[0031] The flame retardant viscose fiber is then wrapped around the outside of the composite spiral yarn in a spiral winding manner for mixing, and the mixing ratio is controlled between 70:30 and 50:50. A multi-pass drawing frame is used for drawing, the number of drawing passes is controlled at 4-6 passes, and the drawing frame speed is controlled at 20-30 meters per minute.

[0032] Use A454 roving frame to prepare roving from mixed flame-retardant viscose fiber and composite spiral yarn, with a drafting multiple of 1.2-1.5 times, a twist of 80-120 twists / m, and a roving frame speed of 10-15 m / min. Then use FA502 spinning frame to prepare spun yarn, with a drafting multiple of 1.6-2.0 times, a twist of 150-250 twists / m, and a spinning frame speed of 25-35 m / min. Finally, use an automatic winder for winding and forming, with a winding speed of 400-600 m / min, to obtain a highly stable composite yarn. After obtaining the composite yarn, heat treatment is performed for finalization, with a heat treatment temperature of 200-250°C and a time control of 1-2 min.

[0033] It should also be noted that the flame-retardant viscose fiber is wrapped around the outside of the composite spiral yarn in a spiral winding manner for mixing. Specifically, during the winding process, the flame-retardant viscose fiber is spirally wound around the outside of the composite spiral yarn at an angle of 45° to form a tight wrapping layer. Due to its special spiral structure, the carbon nanotube / polymer nanofiber composite spiral yarn has a stable and reversible rotation characteristic in water. This structure helps to maintain the stability of the fiber during the washing process and reduce the fiber swelling caused by water penetration. The carbon nanotube itself has extremely high strength and toughness. When it is combined with polymer nanofibers to form a composite spiral yarn, it can significantly improve the overall strength and wear resistance of the yarn. This high-strength characteristic helps to resist mechanical friction and scouring during the washing process, thereby protecting the flame-retardant viscose fiber from damage. The flame-retardant viscose fiber itself has excellent flame-retardant properties and can prevent the spread and combustion of flames under certain conditions. By blending and spinning with other fibers, a certain protective layer can be formed to reduce the damage to the flame-retardant properties caused by washing.

[0034] When the carbon nanotube / polymer nanofiber composite spiral yarn is mixed with the flame-retardant viscose fiber, the flame-retardant viscose fiber is wrapped around the outside of the composite spiral yarn in a spiral winding manner to increase the mutual entanglement and contact between the fibers, thereby further improving the compactness of the fiber structure. The flame-retardant viscose fiber is tightly wound around the outside of the composite spiral yarn in a spiral shape. This arrangement greatly reduces the gaps between the fibers. Compared with the traditional parallel arrangement or loose interweaving, spiral winding can form a more compact and continuous fiber structure, and the tight spiral winding increases the contact area between the fibers, so that the interaction force between the fibers is enhanced. This interaction force helps to limit the expansion and deformation of the fiber in water, thereby reducing the fiber swelling caused by water penetration, and the tight spiral winding structure provides an effective physical barrier for water penetration and diffusion. Since the gaps between the fibers are greatly reduced, the penetration and diffusion path of water between the fibers becomes more tortuous and complex. This increases the difficulty of water penetration, thereby reducing the degree of fiber swelling. The spiral winding arrangement enhances the overall structural stability of the composite yarn. During the long-term washing process, this structural stability helps to maintain the integrity and stability of the fiber structure, thereby reducing the fiber swelling caused by structural damage. The compact fiber structure also increases the contact area between fibers, thereby enhancing the interaction between fibers. This interaction helps to limit the expansion and deformation of the fiber in water, further reducing the degree of fiber swelling.

[0035] S2: The composite yarn is mixed with aramid and conductive fibers, twisted, and wound to obtain a composite textile yarn with high tensile strength and stability;

[0036] In a preferred embodiment of the present invention, in S2, the conductive fiber is selected from one of conductive polymer fiber, graphene fiber and metal nanofiber, the mixed drawing parameters are that the ratio of composite yarn to aramid and conductive fiber is 6-8:2:1, the number of drawing paths is 4-6, the drawing speed is 20-30m / min, and the twisting is to first make the product after drawing into coarse yarn, then prepare it into fine yarn, and finally wind it into shape, and the winding speed is 20-30m / min.

[0037] In a preferred embodiment of the present invention, the roving is made specifically by feeding the mixed and drawn fibers into a roving frame for stretching and twisting, with parameters of a stretching multiple of 1.2-1.5 times, a twist of 80-120 twists / m, and a roving frame speed of 10-15m / min; the spun yarn is made specifically by feeding the roving product into a spun yarn frame for stretching and twisting again, with parameters of a twisting multiple of 1.5-2 times, and a twist of 150-200 twists / m.

[0038] It should be noted that the composite yarn, aramid and conductive fiber are mixed and drawn again, twisted and wound to form a composite textile yarn, wherein the conductive fiber is selected from one of conductive polymer fiber, graphene fiber and metal nanofiber, and the mixing ratio is 6-8:2:1 for drawing and weaving, the number of drawing passes is 4-6, the drawing speed is 20-30m / min, and then twisted. The woven yarn is first passed through a roving machine to form roving, wherein the drafting multiple is 1.2-1.5 times, the twist is 80-120 twists / m, and the roving machine speed is 10-15m / min, and then the prepared roving is passed through a spun yarn machine to form spun yarn, wherein the twisting multiple is 1.5-2 times, the twist is 150-200 twists / m, and finally the winding speed is 20-30m / min to make a composite textile yarn.

[0039] It should also be noted that the conductive fiber is preferably a conductive polymer fiber with a small bending stiffness. The conductive polymer fiber has good flexibility and its bending stiffness is relatively small, which makes the fiber easy to bend and shape during the textile processing, which is conducive to the formation of uniform yarn and fabric structure. Due to its good flexibility and elasticity, the conductive polymer fiber is not easy to break during the spinning process, and can be smoothly blended with other fibers or spun alone, thereby producing high-quality textiles. Conductive polymer fibers have high breaking strength and elongation at break, which enables the fiber to maintain good integrity when subjected to external forces and is not easy to break, thereby improving the durability and strength of the textile. Conductive polymer fibers are good conductors of electricity and have low resistivity, which makes the fiber have excellent conductive properties in textiles and can be used to make textiles with antistatic, electromagnetic shielding and other functions. Conductive polymer fibers can maintain good stability at high temperatures and are not prone to thermal decomposition or melting, which enables the fiber to withstand high temperatures during the production of textiles, which is conducive to the molding and shaping of textiles. In summary, when using conductive polymer fibers for blending, due to the conductive properties of the fibers, the fabric can effectively conduct static charges, thereby avoiding the occurrence of static electricity accumulation and discharge. This antistatic property is permanent and will not decrease due to washing or use time. The addition of flame retardant viscose fiber makes the blended fabric have excellent flame retardant properties. During the combustion process, the flame retardant viscose fiber can quickly decompose and absorb heat, while releasing a large amount of water vapor to dilute the combustible gas, thereby reducing the combustion speed and preventing the spread of the fire. This flame retardant property makes the blended fabric safer in fire.

[0040] S3: mixing a phosphorus-containing compound, a nitrogen-containing compound, triethylamine, ethanol and water, adding a catalyst for reaction, mixing and impregnating the composite textile yarn to generate new covalent bonds, and drying to obtain a flame-retardant yarn;

[0041] In a preferred embodiment of the present invention, in S3, the phosphorus-containing compound is selected from spirocyclic phosphate dichloride, metaphosphate and hydrogen phosphate, the nitrogen-containing compound is selected from polyetheramine, nitrogen dioxide and nitrogen pentoxide, and the ratio of the phosphorus-containing compound, the nitrogen-containing compound, triethylamine, ethanol and water is 30-50:20-40:10:15:5.

[0042] In a preferred embodiment of the present invention, in S3, the catalyst is acetic acid, and the added amount accounts for 2%-5% of the total mass of the reactants.

[0043] In a preferred embodiment of the present invention, in S3, the immersion temperature is 70-80°C, the time is 20-25 min, and the drying temperature is 70-80°C, the time is 10-15 min.

[0044] It should be noted that a phosphorus-containing compound spirocyclic phosphate dichloride and a nitrogen-containing compound polyetheramine are selected, and spirocyclic phosphate dichloride, polyetheramine, triethylamine, ethanol and water are mixed in a ratio of 30-50:20-40:10:15:5 to react and add catalyst acetic acid to catalyze the reaction. The amount of the catalyst accounts for 2%-5% of the total mass of the reactants, thereby obtaining a flame retardant liquid, and the prepared composite textile yarn is immersed in the flame retardant liquid at a temperature of 70-80°C for 20-25 minutes. After the impregnation is completed, the composite textile yarn is taken out for drying at a drying temperature of 70-80°C for 10-15 minutes.

[0045] It should also be noted that when aramid is impregnated with a flame retardant liquid, the functional groups in the aramid fiber (i.e., hydroxyl groups and amino groups) have similar reactivity to the active ingredients in the flame retardant liquid (i.e., phosphate groups and amine groups), and chemical reactions can occur between them. This reaction involves processes such as condensation, addition, or substitution between functional groups, thereby forming a new chemical bond, a covalent bond. Specifically, the hydroxyl groups in the aramid fiber undergo a condensation reaction with the phosphate groups in the flame retardant liquid, and after removing the water molecules, an ester bond (a type of covalent bond) is formed. In some cases, the active free radicals in AHPA may undergo an addition reaction with the unsaturated bonds in the aramid fiber to form a new carbon-carbon bond or carbon-heteroatom bond, which is also a type of covalent bond. Or some substituents in the aramid fiber (such as halogens, nitro groups, etc.) may be replaced by active groups in AHPA to form new covalent bonds. By forming stable covalent bonds, the flame retardant liquid can firmly adhere to the surface of the aramid fiber. This strong bond helps prevent the flame retardant from being washed away by water during washing, thereby improving the washability of flame retardant textiles.

[0046] In addition to surface attachment, the flame retardant liquid also penetrates into the interior of the aramid fiber. Inside the fiber, the active ingredients of the flame retardant liquid can react with the functional groups inside the fiber to form a cross-linked structure. This cross-linked structure not only enhances the bonding force between the fiber and the flame retardant, but also improves the overall stability and durability of the fiber. Embodiment 1:

[0047] Carbon nanotube / polymer nanofiber composite spiral yarn selects carbon nanotubes (CNTs) to be evenly distributed in the yarn, with a stable spiral structure, a yarn diameter of 80 microns, and flame-retardant viscose fibers with a fiber length of 50 mm and a linear density of 2 deniers. The composite spiral yarn is pretreated with plasma treatment technology for 2 minutes at a power of 50W to improve the fiber surface energy, and then modified with a coupling agent (i.e., silane coupling agent) for 30 minutes at a temperature of 60°C and a coupling agent concentration of 2%.

[0048] Then, the flame retardant viscose fiber is wrapped around the outside of the composite spiral yarn in a spiral winding manner for mixing. The spiral angle is 45° and the mixing ratio is 6:4. A multi-pass drawing frame is used for drawing. The number of drawing passes is controlled at 5 and the drawing frame speed is controlled at 28 m / min.

[0049] Use A454 roving frame to prepare roving from mixed flame-retardant viscose fiber and composite spiral yarn, with a drafting multiple of 1.3 times, a twist of 100 twists / m, and a roving frame speed of 13 m / min. Then use FA502 spinning frame to prepare spun yarn, with a drafting multiple of 1.8 times, a twist of 200 twists / m, and a spinning frame speed of 30 m / min. Finally, use an automatic winder for winding and forming, with a winding speed of 500 m / min, to obtain a highly stable composite yarn. After obtaining the composite yarn, heat treatment is performed for finalization, the heat treatment temperature is 230°C, and the time is controlled at 1.5 min.

[0050] The composite yarn, aramid and conductive fiber are mixed and drawn again, twisted and wound to form a composite textile yarn, wherein the conductive fiber is selected from conductive polymer fiber, and the mixing ratio is 7:2:1 for drawing and weaving, the number of drawing passes is 5, the drawing speed is 25m / min, and then twisted. The woven yarn is first passed through a roving machine to make roving, wherein the drafting multiple is 1.3 times, the twist is 100 twists / m, and the roving machine speed is 13m / min. The prepared roving is then passed through a spun yarn machine to make spun yarn, wherein the twisting multiple is 1.8 times, the twist is 180 twists / m, and finally the winding speed is 25m / min to make a composite textile yarn.

[0051] A phosphorus-containing compound spirocyclic phosphate dichloride and a nitrogen-containing compound polyetheramine are selected, and spirocyclic phosphate dichloride, polyetheramine, triethylamine, ethanol and water are mixed in a ratio of 40:30:10:15:5 to react, and catalyst acetic acid is added to catalyze the reaction, and the amount of the catalyst accounts for 3% of the total mass of the reactants, so as to obtain a flame retardant liquid, and the prepared composite textile yarn is immersed in the flame retardant liquid, the immersion temperature is 75°C, and the time is 23 minutes. After the immersion is completed, the composite textile yarn is taken out and dried, the drying temperature is 78°C, and the time is 13 minutes to obtain a flame retardant yarn, and finally the flame retardant yarn is used to weave a jacket, and finally a flame retardant and antistatic jacket is obtained.

[0052] Experiment 1

[0053] The preparation process of Example 1 was used as experimental group 1, and the winding angle of the flame retardant viscose fiber and the mixing ratio of the flame retardant viscose fiber and the spiral yarn in step S1 were changed on the basis of Example 1, so as to prepare them respectively, and several preparation processes were used as several control groups, and a 10 cm section was cut from the jackets prepared in the experimental group and several control groups. 2 The fiber bundles of different sizes were placed in a temperature-controlled water bath, set at 40°C, and soaked in water for 24 hours to ensure that they fully absorbed water. The fiber bundles were taken out of the water bath, and the surface water was gently absorbed with absorbent paper. Then, the size after water absorption was measured immediately. The swelling rate was calculated based on the size change before and after water absorption. Swelling rate = (size after water absorption - initial size) / initial size × 100%, see Table 1 for details.

[0054] Table 1

[0055]

[0056] As can be seen from Table 1, the flame-retardant viscose fiber is tightly wound around the outside of the composite spiral yarn in a spiral shape. This arrangement greatly reduces the gaps between fibers. Compared with the traditional parallel arrangement or loose interweaving, spiral winding can form a more compact and continuous fiber structure. When the winding angle is too large or too small, the contact area and interaction force between the fibers will be reduced accordingly. This will lead to an increase in the gaps in the fiber structure and a reduction in the compactness, which will further increase the swelling of the fiber. Only when the winding angle is between 10°-90°, the contact area between the fibers will increase significantly, and the interaction force between the fibers will also increase. This tight arrangement helps to reduce the gaps between the fibers and improve the overall compactness of the fiber structure.

[0057] Secondly, the mixing ratio (i.e. the ratio of flame-retardant viscose fiber to composite spiral yarn) also directly affects the compactness of the fiber structure. If the proportion of flame-retardant viscose fiber in the mixing ratio is low, the entanglement and contact between fibers will be reduced, resulting in more voids in the fiber structure and reduced compactness. When the proportion of flame-retardant viscose fiber in the mixing ratio is high, the entanglement and contact between fibers will be tighter, which helps to improve the compactness of the fiber structure. If the content of spiral yarn is too high, the proportion of flame-retardant viscose fiber in the fiber structure will be reduced accordingly. This will lead to less entanglement and contact between fibers, more voids, reduced compactness, and also increase in swelling.

[0058] Experiment 2

[0059] The preparation process of Example 1 was used as Experimental Group 2, and the impregnation temperature and the drying temperature in step S3 were changed on the basis of Example 1 to prepare them respectively, and several preparation processes were used as several control groups. The flame-retardant yarns prepared by several experimental groups and Control Group 2 were used as samples. The samples were properly cleaned to remove surface pollutants and impurities, and the prepared samples were placed in the sample chamber of SEM. The surface of the samples was scanned point by point using SEM to obtain clear images, and the surface morphology and microstructure of the samples were observed to see if there was agglomeration or shedding, as shown in Table 2.

[0060] Table 2

[0061]

[0062] According to Table 2, when the impregnation temperature is too high, that is, higher than 80°C, the movement speed between the reactant molecules increases sharply, resulting in a too fast reaction rate. This may cause some intermediates or active ingredients in the reaction system to react further with other molecules before they can stabilize, thereby generating undesirable by-products. These by-products may interfere with the formation of covalent bonds and reduce the performance of flame-retardant yarns. In addition, too high an impregnation temperature may also cause the catalyst to be deactivated or undergo structural changes, resulting in a reduction in its catalytic effect or even complete failure, which in turn leads to a large amount of shedding of the catalyst without forming covalent bonds.

[0063] When the immersion temperature is too low, that is, below 70°C, the movement speed of the reactant molecules slows down, resulting in a decrease in the reaction rate. The collision frequency between the reactants will be reduced, thereby reducing the efficiency of covalent bond formation. If the immersion temperature is too low, the reaction cannot be fully carried out, resulting in incomplete conversion between the reactants. This may cause some reactants to remain on the surface or inside the yarn, affecting the performance and stability of the flame-retardant yarn, and causing a large amount of shedding during the test process.

[0064] When the drying temperature is too high, that is, higher than 80°C, the covalent bonds that have been formed will be destroyed, resulting in a decrease in the performance of the flame-retardant yarn. This is because the intermolecular movement is intensified at high temperatures, which may cause the originally stable covalent bonds to break or rearrange. In addition, high temperatures can also cause the yarn to deform and shrink, affecting the dimensional stability and appearance quality of the flame-retardant yarn and causing a large amount of agglomeration.

[0065] If the drying temperature is too low, that is, below 70°C, the covalent bonds that have been formed will not be completely stabilized due to lack of sufficient subsequent thermal energy, and will break, which will lead to a large amount of shedding during the detection process.

[0066] The above is based on the ideal embodiment of the present invention. Through the above description, relevant personnel can make various changes and modifications without departing from the technical concept of the present invention. The technical scope of the present invention is not limited to the content in the specification, and the technical scope must be determined according to the scope of the claims.

Claims

1. A preparation process of a flame retardant and antistatic jacket, characterized in that: The following steps are involved: S1: pretreating the carbon nanotube / polymer nanofiber composite spiral yarn, wrapping the flame-retardant viscose fiber around the outside of the composite spiral yarn in a spiral winding manner, mixing and drawing, twisting, and winding to obtain a highly stable composite yarn; S2: The composite yarn is mixed with aramid and conductive fibers, twisted, and wound to obtain a composite textile yarn with high tensile strength and stability; S3: mixing a phosphorus-containing compound, a nitrogen-containing compound, triethylamine, ethanol and water, adding a catalyst for reaction, mixing and impregnating the composite textile yarn to generate new covalent bonds, and drying to obtain a flame-retardant yarn; S4: Use flame retardant yarn to weave into a jacket; In the S1, the pretreatment is specifically as follows: subjecting the spiral yarn to plasma treatment to change the fiber surface energy for 2-5 minutes at a power of 40-50w, and using a coupling agent to modify the surface of the spiral yarn for 30-40 minutes at a temperature of 60-65°C and a coupling agent concentration of 1%-2%; the mixing ratio of the flame-retardant viscose fiber and the composite spiral yarn is 5-7:3-5, the number of drawing passes is 4-6, the winding angle is 45°, the drawing frame speed is 20-30m / min, the twisting is firstly roving preparation and then spun yarn preparation, and the winding speed is 400-600m / min; In S3, the phosphorus-containing compound is selected from spirocyclic phosphate dichloride, metaphosphate, and hydrogen phosphate; the nitrogen-containing compound is selected from polyetheramine, nitrogen dioxide, and nitrogen pentoxide; the ratio of phosphorus-containing compound, nitrogen-containing compound, triethylamine, ethanol, and water is 30-50:20-40:10:15:5; the catalyst is acetic acid, and the added amount accounts for 2%-5% of the total mass of the reactants; the immersion temperature is 70-80°C, the time is 20-25min, and the drying temperature is 70-80°C, and the time is 10-15min.

2. The preparation process of a flame retardant and antistatic jacket according to claim 1, characterized in that: In S1, the diameter of the carbon nanotube / polymer nanofiber composite spiral yarn is 50-100 μm, the length of the flame retardant viscose fiber is 28-51 mm, and the linear density is 1.5-3.0 denier.

3. The preparation process of a flame retardant and antistatic jacket according to claim 1, characterized in that: The specific steps of twisting are: first prepare coarse yarn, with a drafting multiple of 1.2-1.5 times, a twisting degree of 80-120 twists / m, and a coarse yarn frame speed of 10-15m / min, and then prepare fine yarn, with a drafting multiple of 1.6-2.0 times, a twisting degree of 150-200 twists / m, and a fine yarn frame speed of 25-35m / min.

4. The preparation process of a flame retardant and antistatic jacket according to claim 1, characterized in that: In the S2, the conductive fiber is selected from a mixed conductive polymer fiber, a graphene fiber and a metal nanofiber, and the drawing parameters are that the ratio of the composite yarn to the aramid fiber to the conductive fiber is 6-8:2:1, the number of drawing paths is 4-6, the drawing speed is 20-30m / min, and the twisting is to first make the drawn product into a coarse yarn, then prepare it into a fine yarn, and finally wind it into shape, and the winding speed is 20-30m / min.

5. The preparation process of a flame retardant and antistatic jacket according to claim 4, characterized in that: To make roving, the mixed and drawn fibers are fed into a roving frame for drawing and twisting, with parameters of a drawing multiple of 1.2-1.5 times, a twist of 80-120 twists / m, and a roving frame speed of 10-15m / min; to make fine yarn, the roving product is fed into a fine yarn frame for drawing and twisting again, with parameters of a twisting multiple of 1.5-2 times, and a twist of 150-200 twists / m.

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