258 results about "Polyamide fibers" patented technology

The invention discloses a flame-retardant high-temperature-resistant fiber and a preparation method thereof, and relates to the technical field of fibers. When the flame-retardant high-temperature-resistant fiber is prepared, 1, 6-hexamethylenediamine, 1, 6-adipic acid, tetrahydrodifuran [3, 4-B: 3 ', 4'-D] furantetraone and a phosphorus-sulfur composite flame retardant are copolymerized to generate a polyamide-polyamide acid solution; 4-aminopyridine and the polyamide-polyamide acid solution are subjected to a reaction, and modified polyamide is prepared; the modified polyamide is subjected to melt spinning, and polyamide fibers are prepared; the preparation method comprises the following steps: pretreating nano titanium dioxide by using 4-bromobutyl trimethoxy silane to prepare modified nano titanium dioxide; mixing the modified nano titanium dioxide and ethanol to prepare a light-resistant antibacterial finishing agent; and carrying out post-treatment on the polyamide fiber by using an anti-light antibacterial finishing agent to prepare the flame-retardant and high-temperature-resistant fiber. The prepared fiber is excellent in comprehensive performance, particularly outstanding in flame retardance and high temperature resistance, and suitable for the fields of special protective clothing, high-temperature filtering materials and the like.

The invention relates to the technical field of knitted fabrics, in particular to a high-strength wear-resistant anti-snagging functional dry knitted fabric for exercise training and a production process thereof, and the production process comprises the following steps: weighing the following raw materials in parts by weight: 30-40 parts of polyester fibers, 20-30 parts of aramid fibers, 5-10 parts of jade fibers and 5-10 parts of polyamide fibers; polyester fibers, aramid fibers, jade fibers and polyamide fibers are subjected to relaxation treatment and then subjected to a drawing procedure, and the mixed roving is obtained. According to the knitted fabric for exercise training, polyester fibers, aramid fibers, jade fibers and polyamide fibers are blended and blended to prepare mixed roving, meanwhile, the mixed roving is infiltrated and improved through infiltrating liquid, finally, the mixed roving is matched with modified polyester filaments to be subjected to circular knitting improvement, and the obtained knitted fabric has the advantages of being excellent in wear resistance, mechanical strength performance and snagging performance, good in elasticity and good in elasticity. And the knitted fabric has remarkable moisture absorption, dryness and dryness and washing resistance, and the comprehensive coordination of the product is excellent.

The invention discloses an anti-ultraviolet spinning yarn and a preparation method thereof, and relates to the technical field of spinning yarns. When the anti-ultraviolet spinning yarn is prepared, 2, 4, 6-tri (4-hydroxyphenyl) boroxane and methylphenyl phosphonium chloride are subjected to a reaction, and a phosphorus-boron composite flame retardant is prepared; the preparation method comprises the following steps: polymerizing indole and 5-(aminomethyl) indole to coat the surface of nano titanium dioxide to prepare pre-modified nano titanium dioxide; the pre-modified nano titanium dioxide and (3-acryloyloxypropyl) tri (trimethylsiloxy) silane are subjected to a reaction, and modified nano titanium dioxide is prepared; mixing poly (pentamethylene diamine adipate), the modified nano titanium dioxide and the phosphorus-boron composite flame retardant, and performing melt spinning to obtain polyamide fibers; spinning polyamide fibers to obtain polyamide spun yarns; the polyamide spinning yarn is sequentially finished with the chloroacetic acid finishing liquid and the isoliquiritigenin finishing liquid, and the anti-ultraviolet spinning yarn is prepared. The anti-ultraviolet spinning yarn prepared by the invention has excellent anti-ultraviolet, flame-retardant and anti-static properties.

The present invention provides a fiber structure having excellent antibacterial properties and washing durability, and a method for producing the same. [Solution] A textile structure having polyamide fibers and containing a dye, a quinoline-based compound, and a phenol derivative, wherein the textile structure contains 0.04% by mass or more of the quinoline-based compound relative to the mass of the textile structure, and even after 10 standard washes in accordance with the "SEK Mark Textile Product Washing Method," the textile structure contains 0.04% by mass or more of the quinoline-based compound relative to the mass of the textile structure, and 0.20% by mass or more and 4.00% by mass or less of the phenol derivative relative to the mass of the textile structure.

The invention belongs to the field of novel polyamide composite fiber materials, and particularly discloses a high-toughness polyamide fiber composite material and a preparation method thereof. The composite material is prepared from the following raw materials in parts by weight: 55-75 parts of long-chain polyamide PA610 resin, 10-25 parts of ultra-high molecular weight polyethylene fiber, 8-18 parts of polyether block amide elastomer, 1.5-4 parts of a compound nucleating agent, 0.8-2 parts of a titanate coupling agent and 0.3-1 part of a composite antioxidant. The preparation method is characterized by comprising the following steps: firstly, carrying out surface pretreatment on the ultra-high molecular weight polyethylene fiber by adopting a low-temperature plasma technology so as to improve the interfacial compatibility of the ultra-high molecular weight polyethylene fiber and a resin matrix; and then carrying out melt blending granulation on the pretreated fiber and other raw materials through a twin-screw extruder, wherein the fiber is added from a side feeding port to avoid excessive shearing and breaking. The obtained product has ultrahigh impact toughness, excellent rigidity, excellent low-temperature toughness and heat resistance, and is especially suitable for the fields of manufacturing automobile parts, sports protection equipment and the like with extremely high requirements on toughness and durability.

The invention relates to the technical field of fibers, and discloses a thermal insulation polyamide fiber and a preparation method thereof. Polyurethane modified silicon dioxide aerogel with a phase change unit and a heat insulation carrier is prepared, the polyurethane modified silicon dioxide aerogel and epoxidized carbon nanotubes with light absorption and heat generation performance are jointly introduced into PA6 slices, epoxy groups react with carboxyl and amino at the tail end of a PA6 main chain under the melting condition, the dispersity and compatibility of all components in the PA6 slices are improved, and the heat insulation performance of the PA6 is improved. The polyamide fiber prepared by melt spinning not only has good heat insulation performance, but also can utilize the phase change material and the light absorption heating material to store energy and regulate temperature, so that the heat storage and heat preservation performance of the fiber is further improved.

The invention provides multifunctional composite fiber reinforced decorative base paper and a preparation method thereof. The decorative base paper is prepared from the following raw materials in parts by weight: 30-60 phr of wood pulp fibers, 15-35 phr of bamboo fibers, 1-10 phr of polyester fibers, 1-10 phr of polyamide fibers, 57-91 phr of an antibacterial reinforcing agent, 3-20 phr of a flame retardant and 1-10 phr of nano cellulose. The antibacterial reinforcing agent is prepared from the following components in parts by weight: 1 to 5 phr of silver nitrate, 3 to 10 phr of tetrabutyl titanate, 2 to 8 phr of sulfydryl modified chitosan, 50 to 70 phr of absolute ethyl alcohol and 2 to 6 phr of plant essential oil; the flame retardant is a composition of ammonium polyphosphate and aluminum hydroxide wrapped by chitosan. According to the invention, the composite fiber prepared by compounding four fibers is used, and the antibacterial agent, the flame retardant and the nano cellulose are added to supplement functionality, so that the multifunctional composite fiber reinforced decorative base paper with high strength, excellent wear resistance and excellent antibacterial performance is obtained, and the fireproof performance of the multifunctional composite fiber reinforced decorative base paper reaches the national B1-level fireproof standard.

The invention discloses an elastic composite shielding cable for a ship and a preparation process thereof, and aims to solve the problems of poor environmental adaptability, low shielding effectiveness, insufficient elasticity and unstable process of an existing ship cable. The cable sequentially comprises a conductor layer, an insulating layer, a composite shielding layer and a sheath layer from inside to outside, wherein the conductor layer is formed by twisting a plurality of strands of superfine tinned oxygen-free annealed copper wires, and two 1500D aromatic polyamide fiber elastic cores are arranged in the center of the conductor layer; the insulating layer is made of ethylene propylene rubber or thermoplastic elastomer, and the dielectric constant is not more than 3.0; the composite shielding layer is of a double-layer structure of aluminum-plastic composite tape wrapping and tinned copper wire weaving, and the shielding effectiveness of the X wave band is larger than or equal to 30 dB. The sheath layer is of a chloroprene rubber or polyurethane double-layer structure, tests such as C5-M-grade salt mist are carried out, the preparation process comprises the steps of conductor twisting, insulation extrusion, composite shielding forming and the like, various parameters are accurately controlled, the bending radius of the cable is smaller than or equal to 6D, and the cable is stable in performance after being repeatedly bent for 1000 times, low in smoke, halogen-free, flame-retardant, adaptive to severe environments of ships, stable in process and high in reliability. And reliable operation of ship equipment can be ensured.

The invention relates to the technical field of high polymer materials and synthetic fibers, and particularly discloses a high-wear-resistance polyamide fiber and a preparation method thereof. The fiber is prepared by taking polycaprolactam as a matrix, compounding spherical nano silicon carbide and molybdenum disulfide nanosheets as wear-resistant components, taking a maleic anhydride grafted hydrogenated styrene-ethylene-butadiene-styrene block copolymer as an interface compatilizer, and taking hyperbranched polyamide-amine as a dispersing agent. The polyester fiber is prepared through the processes of master batch preparation, melt spinning, multi-stage hot drafting and relaxation heat setting. Through the synergistic effect of all the components and the optimization process, the wear resistance of the fiber is remarkably improved, and meanwhile, the common problems of toughness reduction and fatigue resistance deterioration in high-wear-resistance modification are effectively solved. The polyamide fiber is tough and durable, is specially used for manufacturing high-safety-requirement products such as mountaineering ropes, rescue ropes and industrial lifting belts, and can reduce the fracture risk in repeated use and guarantee the use safety.

The invention discloses an antistatic flame-retardant fiber and a preparation method thereof, and relates to the technical field of functional textile materials. When the antistatic flame-retardant fiber is prepared, the multi-walled carbon nanotube is carboxylated to prepare the modified multi-walled carbon nanotube; carrying out surface free radical polymerization on the modified multi-walled carbon nanotubes and caprolactam to obtain modified polyamide 6 slices; the modified polyamide 6 is sliced and spun, and modified polyamide 6 fibers are prepared; the preparation method comprises the following steps: respectively reacting phytic acid and 2, 3-epoxypropyl trimethyl ammonium chloride with chitosan to prepare a polyanion / cation modified chitosan solution; the modified polyamide 6 fiber is alternately soaked in two modified chitosan solutions, and is treated by cocamidopropyl betaine to prepare the antistatic flame-retardant fiber. The antistatic flame-retardant fiber prepared by the invention has excellent antistatic property, flame retardance and mechanical strength.

The application relates to the technical field of polyamide materials, and discloses a polyamide composite fiber and a preparation method and application thereof.The polyamide composite fiber comprises a first component and a second component, the first component is a polyamide 56 fiber, and the second component is other polyamide fibers, the other polyamide fibers are selected from at least one of a polyamide 6 fiber, a polyamide 66 fiber, a polyamide 510 fiber, a polyamide 511 fiber, a polyamide 512 fiber, a polyamide 610 fiber, a polyamide 611 fiber and a polyamide 612 fiber.The polyamide composite fiber provided by the application has the characteristics of double-color or multi-color effect, low shrinkage effect, high elastic fluffy, better mechanical properties and evenness of strip.

The utility model provides a pre-interlacing suction device for anti-ultraviolet polyamide 6 fiber, which is arranged on the rear side of a pre-interlacing device, the suction device comprises a mounting plate and a suction pipeline for sucking grease, the mounting plate is provided with a mounting hole, one end of the suction pipeline is communicated with the mounting hole, and the other end of the suction pipeline is communicated with the mounting plate. A filter assembly is arranged on the side, close to the pre-stitching device, of the mounting plate, is arranged at the mounting hole, and comprises a filter screen and a fixing unit for fixing the filter screen. According to the oil applying device, the filter screen is arranged at the tail end of the suction pipeline, so that the air circulation area is reduced, the suction force of the suction device is reduced, the suction force of the suction device is more uniform due to the arrangement of the filter screen, and the oil applying uniformity is improved. And meanwhile, the filter screen can also prevent sundries such as waste silk from being pumped into the suction pipeline.

Embodiments of the present invention replace at least some flame retardant fibers (e.g., aramid fibers) in wadding traditionally used for thermal insulation liners with thermally stable polyamide fibers (e.g., nylon fibers). The TPP performance of garments incorporating thermal liner embodiments encompassed herein is comparable to garments formed with conventional thermal liners, even without being improved.

This invention relates to the field of textile printing and dyeing, and discloses a high-colorfastness polyamide 56 fabric and its preparation method. The polyamide 56 fabric contains 70-100% polyamide 56 fiber and 0-30% spandex. The fabric has been dyed at least once, and the dye used for dyeing is a reactive dye. The polyamide 56 fabric dyed with reactive dyes of this invention has the advantages of higher dye uptake, wider pH adaptability, no need for large amounts of calcium salts for dyeing, and minimal or no use of color-fixing crosslinking agents.

An EPDM roofing membrane with improved hail resistance formed from a block of EPDM material with short aramid fibers added to the block of EPDM material at a concentration of 5 to 35 PHR, a weak alkaline accelerator added to the block of EPDM material at a concentration of 2 to 8 PHR, a thermoplastic elastomer added to the block of EPDM material at a concentration of 2 to 10 PHR, polysulfide silane added to the block of EPDM material at a concentration of 2 to 10 PHR; and a hemiaminal ether crosslinking agent added to the block of EPDM material at a concentration of 2 to 10 PHR.

This utility model discloses a moisture-wicking and breathable knitted sweater, comprising: a body and sleeves, which are connected by sewing; both the body and sleeves are made of moisture-wicking and breathable knitted fabric; the moisture-wicking and breathable knitted fabric is a loop-stitched structure woven from ground yarn and face yarn; the ground yarn includes moisture-wicking yarn and cooling yarn; the moisture-wicking yarn is U-shaped cross-section polyester filament; the face yarn is cationic dyeable UV-resistant polyamide 6 fiber yarn. Based on this utility model of moisture-wicking and breathable knitted sweater, the moisture-wicking and breathable knitted fabric used in the body and sleeves is a single-layer knitted fabric, which has better breathability compared to composite fabrics. Combined with the loop-stitched structure, the front of the sweater showcases the color and performance characteristics of the cationic dyeable UV-resistant polyamide 6 fiber yarn, while the reverse side exhibits moisture-wicking and cooling effects. When worn, the reverse side is close to the skin, which helps to quickly wick away sweat and adds a cooling sensation to the skin.

This utility model relates to the field of shoe upper technology and discloses a shoe upper with a 3D pattern, including a shoe upper body. The outer walls of the shoe upper body are distributed with a patterned layered structure. The patterned layered structure includes a polyamide fiber woven layer, and stitching lines are distributed around the edges of the polyamide fiber woven layer. A linen layer is attached to one side of the polyamide fiber woven layer, and inner stitching lines are threaded through the perimeter of the linen layer. A fleece inner layer is attached to one side of the linen layer. This utility model is composed of a polyamide fiber woven layer, stitched fiber woven segments, and a surface patterned layer. The fiber woven segments are stitched to the surface of the polyamide fiber woven layer in a distributed manner, and the patterned layer is also composed in a distributed manner. When the shoe upper is subjected to pressure or deformed during wear, it will not be affected by the deformation of the polyamide fiber woven layer surface, thus preventing cracks from appearing after long-term use.

The utility model discloses a high-elastic wear-resistant polyester gray cloth, and relates to the technical field of fabrics. The key points of the technical scheme are as follows: the contact piece comprises an inner layer and an outer layer which are fixedly connected with each other, the outer layer is provided with a plurality of penetrating grooves, the inner layer is fixedly connected with contact pieces which extend into the penetrating grooves and are narrower than the penetrating grooves, the side walls of the contact pieces abut against the inner walls of the penetrating grooves, the outer layer is fixedly connected with a plurality of wear-resisting pieces, and the wear-resisting pieces are fixedly connected with the outer layer. According to the wear-resistant fabric, the wear-resistant piece and the contact piece are arranged to prolong the wear time of the fabric, the polyamide fibers are good in wear resistance and elasticity, and it is guaranteed that the wear resistance and rebound resilience of the fabric can be both considered by means of the characteristics of the polyamide fibers.

This utility model discloses a knitted fabric made of polyamide fiber material with a small spring molecular structure, specifically relating to the field of knitted fabric technology. It includes multiple knitted structures woven from first and second fiber yarns. The first and second fiber yarns are woven with a double-sided variation structure. Both the first and second fiber yarns are spirally coiled into small spring molecular shapes. Each knitted structure uses a six-way repeat, where the six ways include a first, second, third, fourth, fifth, and sixth way. The first, second, fourth, and fifth ways are all woven from the first fiber yarn, while the third and sixth ways are woven from the second fiber yarn. This utility model uses 50D / 48F high-fill modified polyamide yarn to produce the fabric on a weft-knitted circular knitting machine. The fabric is lightweight, fluffy, soft and smooth to the touch, elastic, and resistant to pilling, meeting the comfort requirements for lightweight outerwear such as T-shirts and polo shirts.

The utility model discloses an anti-deformation knitted fabric, which relates to the technical field of textile fabrics and is characterized in that two sides of an elastic layer are respectively provided with a plurality of grooves I and a plurality of grooves II, one side of the elastic layer, which is positioned in the grooves I, is fixedly connected with a plurality of springback pieces, and the elastic recovery capability of the springback pieces is greater than that of the elastic layer. A plurality of stretching spaces are formed between the springback pieces and the first grooves, tensile pieces are fixedly connected to the bottom faces of the second grooves, and the stretching distance of the tensile pieces is smaller than that of the elastic layer. The elastic layer obtains a larger stretching distance through the plurality of stretching spaces and the plurality of second grooves, and the elastic layer has good shape maintaining performance due to the high elasticity and elasticity recovery capacity of the spandex fibers. The springback sheet and the tensile sheet which are made by blending the spandex fibers and the polyamide fibers can generate large springback force after being stretched along with the elastic layer, so that the elastic layer is driven to quickly recover to the original shape after being stretched, and the fabric is not prone to deformation.

The utility model relates to the technical field of SPC floors, and discloses a wear-resisting SPC floor which comprises a wear-resisting layer, an extending convex block, an embedding block, an embedding groove, a base material layer, a color film layer, a polyamide fiber layer and a polypropylene fiber layer, the extending convex block is fixedly arranged at one end of the wear-resisting layer, the embedding block is fixedly arranged at the other end of the wear-resisting layer, and the embedding groove is formed in the base material layer. An embedding groove is fixedly formed in the wear-resistant layer, a base material layer is fixedly arranged at the lower end of the wear-resistant layer, a color film layer is fixedly arranged at the lower end of the base material layer, a stone crystal core layer is fixedly arranged at the lower end of the color film layer, and a polyamide fiber layer is fixedly arranged at the lower end of the stone crystal core layer. According to the wear-resistant SPC floor, by improving the SPC floor, the multi-stage screening structure of the SPC floor is improved, in the actual use process of the SPC floor, the wear-resistant SPC floor can be quickly and conveniently spliced and assembled according to needs, strong supporting of the SPC floor is facilitated, and the use experience of the wear-resistant SPC floor is improved.

The invention relates to the technical field of preparation of semi-dull chinlon chips, and discloses a preparation method of semi-dull chinlon chips, which comprises the following steps: drying caprolactam and regulating the particle size by adopting a high-purity raw material and a pretreatment method to obtain a polymerization reaction basic raw material; compounding and adding the polymerization reaction basic raw materials by adopting a novel additive system method to obtain a mixed material; carrying out high-molecular-weight polyamide synthesis on the mixed material by adopting a polymerization reaction method, and adjusting process parameters to obtain a high-quality polyamide fiber precursor. According to the preparation method of the semi-dull chinlon chips, through the steps of high-purity raw material selection and pretreatment, water removal and particle size homogenization of caprolactam are achieved, and low reaction efficiency or product quality fluctuation caused by impurities or uneven particle size is avoided; the effects of improving the quality of the raw materials, reducing the generation of byproducts and improving the performance of the final product are achieved, an organic silicon substance is introduced to serve as a light stabilizer, and a vitamin E derivative serves as an antioxidant.

The invention provides a copolymerization modified flame-retardant high-strength polyamide 66 fiber and a preparation method thereof. The preparation method comprises the following steps: adding pyridine heterocyclic ring-containing amide salt, aromatic structure amide salt, nylon 66 salt and deionized water into a polymerization kettle as a reaction system; regulating and controlling the temperature and the pressure of a reaction system in an inert gas atmosphere, and carrying out staged reaction to obtain copolymerized modified polyamide 66 slices; the copolymerization modified polyamide 66 slices are subjected to melt extrusion and spinning to obtain the copolymerization modified flame-retardant high-strength polyamide 66 fiber, and the polyamide 66 fiber with high strength and lasting flame-retardant characteristics is prepared by introducing a copolymerization modification scheme containing a pyridine structure and an aromatic structure.

The invention belongs to the technical field of fabrics, and provides a nylon conductive pearl point four-way stretch fabric and a processing technology thereof.The processing technology comprises the following steps that S1, raw material pretreatment is conducted, specifically, white conductive filaments serve as raw materials, after plasma treatment, the white conductive filaments are modified with a silane coupling agent, and surface modified conductive fibers are obtained; s2, yarn preparation, wherein the surface modified conductive fibers, chinlon and spandex serve as raw materials, and various kinds of yarn are prepared through a twisting machine; s3, warping, drawing and drafting and reed-making are carried out; s4, weaving; s5, carrying out preshrinking treatment and pre-shaping; s6, desizing and dyeing; and S7, softening and shaping to obtain the nylon conductive pearl point four-way stretch fabric. According to the fabric, efficient combination of the conductive fibers and the chinlon / spandex is achieved through the plasma activation and silane coupling agent modification technology, the four-side elastic comfort is kept, meanwhile, lasting and stable conductive performance and durability are achieved, and the comprehensive performance of the functional fabric is remarkably improved.

The invention relates to a dry spinning preparation method of low-shrinkage polyamide fibers, and belongs to the technical field of chemical fibers. Nano aluminum oxide and an enhanced modifier are introduced into a fiber raw material for synergistic modification, the fiber is endowed with excellent low shrinkage, the enhanced modifier can be anchored on the surface of a filler through the strong chelation of a molecular center, and meanwhile, polyether long chains on the periphery of the enhanced modifier and a polyamide matrix form dynamic hydrogen bond entanglement, so that the fiber has excellent low shrinkage. And a rigid core-flexible interface-polymer entanglement net structure is constructed. The structure can effectively limit slippage and rearrangement of a polyamide molecular chain on the premise that the spinning state is not remarkably increased, so that the breaking strength and toughness of the fiber are synergistically improved while the boiling water shrinkage rate and the dry heat shrinkage rate of the fiber are remarkably reduced, and the problems of spinning difficulty and obdurability imbalance caused by traditional filler modification are comprehensively solved.

This product provides a wiping cloth suitable for media cleaning applications that suppresses the increase of particles due to friction during wiping, prevents contamination problems, offers high wiping performance, and leaves minimal residue. [Solution] A wiping cloth made of a fibrous structure using ultrafine polyamide fibers, wherein the single filament fineness of the ultrafine polyamide fibers is 0.7 dtex or less, the content of ultrafine polyamide fibers in the entire wiping cloth is 40% by mass or more, and the average number of airborne particles with a diameter of 0.1 μm or more is 10 particles / cm 2 The following is the wiping cloth.

The invention relates to the technical field of textile fabrics, in particular to a comfortable wool blended fabric and a preparation method thereof. The comfortable wool blended fabric comprises the following fiber components in percentage by mass: 25%-45% of merino wool, 20%-35% of lyocell fibers, 10%-25% of bio-based polyamide 56 fibers, 5%-15% of recycled polyester fibers and 3%-8% of spandex. Due to the combination, the softness, the air permeability, the elasticity and the close-fitting comfort of the final fabric are well balanced, and the scratchiness of the pure wool fabric is remarkably reduced. Besides, a large amount of bio-based and regenerated fibers are used in the formula, so that the dependence on non-renewable petroleum resources is reduced, and the concept of low carbon and environmental protection is embodied. Finally, through double innovation of component design and process design, the wool blended fabric which is extremely comfortable, excellent in functionality and environmentally friendly is successfully prepared.

This invention relates to a renewable polyamide 56 fiber, its preparation method, and its application. The raw materials for its production include at least a tackifying renewable polyamide 56 resin. The relative viscosity of the tackifying renewable polyamide 56 resin is 2.4-2.9, and its crystallization temperature is 180-210℃. This invention uses a tackifying renewable polyamide 56 resin obtained by tackifying a recycled polyamide 56 resin produced from recycled polyamide waste fibers and waste fabrics as a raw material. This not only enables the production of fibers with mechanical and dyeing properties comparable to conventional polyamide 56 fibers but also achieves the goal of recycling polyamide waste.

This invention provides a highly durable and functional recycled all-aromatic polyamide fiber, and a method for producing the same. [Solution] A recovered fiber structure containing meta-type all-aromatic polyamide fibers, para-type all-aromatic polyamide fibers, and conductive fibers is dissolved in an amide-based solvent. In this solution, 10 to 25% by mass of meta-type all-aromatic polyamide polymer is dissolved to produce an all-aromatic polyamide dope. This dope is then used for spinning to obtain regenerated all-aromatic polyamide fibers.

The invention discloses a composite polyamide protective fabric and a preparation method thereof. The polyamide protective fabric comprises a protective layer, a moisture transfer layer and a moisture absorption breathable layer which are sequentially arranged from outside to inside, the protective layer is formed by fasciated yarns, the aramid fiber filaments are core yarns, and the long carbon chain polyamide filaments are outer-layer fasciated yarns; the long carbon chain polyamide filaments are pre-oriented polyamide fibers containing gamma crystal forms; the moisture-absorbing breathable layer is formed by yarns made of cotton, hemp and polyester fibers; the moisture transfer layer is formed from long carbon chain polyamide filaments having a continuously helically deformed profiled cross-sectional structure. The protective layer is formed by wrapping long carbon chain polyamide filaments outside aramid filaments, and the long carbon chain polyamide filaments contain gamma crystal forms, so that the fastness and wearing comfort of the fabric are both considered, the moisture absorption and ventilation layer has sweat guiding and ventilation effects, moisture can be more effectively conducted to the outer side through the moisture transfer layer, and the moisture absorption and ventilation effects are improved. The wearing comfort of the protective fabric is further improved.