1108results about "Stretch-spinning methods" patented technology

The invention discloses an ultra-high molecular weight polyethylene fiber melt spinning method which comprises the following steps: step 1, mixing ultra-high molecular weight polyethylene resin with polyethylene wax and high-density polyethylene to form a composition; 2, melting the composition at a high temperature to form a melt, carrying out melt spinning, and carrying out nozzle stretching and air cooling to obtain nascent fibers; and step 3, carrying out hot stretching and heat setting on the nascent fiber to obtain the final ultra-high molecular weight polyethylene fiber. By adopting the technical scheme, the melt flowability of the ultra-high molecular weight polyethylene can be greatly improved by the high-density polyethylene and the polyethylene wax, so that the ultra-high molecular weight polyethylene resin can be smoothly subjected to melt spinning. Meanwhile, in the hot stretching process, the polyethylene wax can participate in the crystallization process of the ultra-high molecular weight polyethylene resin and the high-density polyethylene, and finally the mechanical property of the ultra-high molecular weight polyethylene fiber can be well maintained.

The invention relates to the field of aramid fabric recycling and reusing, in particular to a method for preparing flame-retardant shielding military tent fabric by recycling waste aramid fabric, which comprises the following steps: step 1, treating the waste aramid fabric with ionic liquid; 2, opening the aramid fabric and recycling aramid fibers; step 3, preparing regenerated flame-retardant prefabricated filaments; step 4, preparing tent base cloth; and step 5, preparing the heat-insulating shielding military tent fabric. Starting from multiple dimensions of aramid fiber recycling and reusing, micro-nano flame-retardant fiber preparation, fabric structure design, functional finishing and the like, more than 98% of flame-retardant viscose and aramid fiber in the aramid fiber blended fabric are recycled and utilized at high value, and the military tent fabric finally developed has the advantages that the flame-retardant viscose and the aramid fiber in the aramid fiber blended fabric are recycled and utilized at high value; the composite material integrates multiple functions of shielding and wave absorbing (the shielding rate is 72dB, the reflectivity is 34.32 dB, and the effective bandwidth is 13.8 GHz), flame retardance, heat insulation, water resistance, oil repellency, air permeability, moisture permeability, weather resistance, softness, durability and the like, and can be used for developing military tents.

The invention discloses a warm-keeping fabric containing hollow polyester fibers as well as a preparation method and application thereof, and relates to the field of fabrics. When the thermal fabric containing the hollow polyester fibers is prepared, hollow mesoporous nano cerium oxide is selectively protected by molten paraffin and then reacts with chloromethyl trimethoxy silane and isocyanuric acid in sequence, paraffin is dissolved by chloroform, and then N-(3-trimethoxysilylpropyl) pyrrole is grafted to obtain modified hollow mesoporous nano cerium oxide; reacting terephthalic acid, a multifunctional monomer and ethylene glycol to obtain modified polyester particles; the preparation method comprises the following steps: granulating modified polyester, uniformly mixing modified hollow mesoporous nano cerium oxide and polyethylene glycol 10000, performing melt spinning, treating with a pyrrole solution, twisting, spinning and weaving, and treating with a sodium hypochlorite mixed solution to obtain the thermal fabric containing the hollow polyester fibers. The warm-keeping fabric containing the hollow polyester fibers prepared by the invention has excellent warm-keeping, antibacterial, anti-aging, flame-retardant, antistatic and mechanical properties.

The invention provides a multifunctional passive cooling optical metamaterial fiber, yarn and fabric and a preparation method thereof. The passive cooling optical metamaterial fiber is composed of high-refractive-index inorganic micro-nano particles and / or a micro-nano functional material and a polymer substrate material. Wherein wavelength / sub-wavelength scale micro-nano particles are uniformly distributed in a substrate material as a random scattering medium to form a random optical metamaterial system, and reflection enhancement of the optical metamaterial fabric in a solar spectrum band is realized by utilizing a multiple Mie resonance collective effect. According to the passive cooling optical metamaterial fiber, a circular structure, a skin-core structure and the like are prepared through melt spinning, high-refractive-index inorganic micro-nano particles are added into a skin layer and used for sunlight band wide spectrum regulation and control, and a micro-nano functional material is added into a core layer, so that multiple functions are effectively achieved.

The invention relates to the technical field of chinlon industrial yarns, and discloses a preparation method of a high-strength and high-toughness chinlon industrial yarn, which comprises the following steps: (1) preparing raw materials; (2) mixing the materials; (3) melt spinning; (4) stretching and heat treatment; (5) fiber surface modification; according to the invention, by fusing the advantages of high crystallization speed of nylon 6 and high melting point and high strength of nylon 66, a matrix material with good processing fluidity is formed, and the strength and fatigue cycle resistance of the chinlon industrial fiber are obviously improved. By introducing the maleic anhydride grafting agent, polar groups can be introduced among molecular chains through grafting reaction, so that the hydrogen bond density and crystallinity are remarkably improved, the molecular chains are arranged more regularly, and the tensile strength and heat resistance of the material are improved. The sea-island structure of the polyether ester elastomer effectively absorbs impact energy, so that the elongation at break is greater than or equal to 28%; the nano silicon dioxide inhibits crack propagation, and the service life of the material is remarkably prolonged.

Sheets of material used in medical devices and filters are disclosed. The sheets may include a fibrous mat including a plurality of microfibers. The microfibers may include a polymer matrix and a plurality of additive particles. The additive particles may include carbon material particles, therapeutic micro particles, and any combination thereof. Medical devices and filters that use the sheets are disclosed. Methods of producing the sheets are also disclosed.

The present invention relates to a method for manufacturing a nonwoven having nanoporous fibers. The method comprises at least the following steps: - providing (10) a spinning solution having a fiber starting material, in particular a polymer, and having a solvent, - producing (12) raw fibers (20) from the spinning solution, in particular by extruding the spinning solution through capillaries; - accelerating (14) the produced raw fibers (20) by means of an acceleration fluid flow; - depositing (16) the accelerated raw fibers (20) as a moist nonwoven precursor (26) with a fluid; - drying (18) the nonwoven precursor (26) while avoiding a state of the liquid of the moist nonwoven precursor (26) in which the liquid has a capillarity, in order to produce the nonwoven having nanoporous fibers. The invention also relates to a nonwoven and to a manufacturing system

A method for preparing a cationic dyeable flame-retardant high-strength polyester fiber is provided, after mixing oligomer A, oligomer B, and ethylene terephthalate and carrying out a polycondensation reaction to obtain a cationic dyeable flame-retardant polyester masterbatch, adding the cationic dyeable flame-retardant polyester masterbatch to the polyester chips according to a certain ratio for melt spinning, to prepare the cationic dyeable flame-retardant high-strength polyester fiber; oligomer A is prepared by the esterification reaction of a phosphorus flame retardant and a diol; oligomer B is prepared by the esterification reaction of sodium isophthalate sulfonate and a diol; the ratio of the sum of the molar weight of oligomer A and oligomer B to the molar weight of ethylene terephthalate is 3:7-6:4. The preparation method is simple, and the cationic dyeable flame-retardant high-strength polyester fiber has excellent mechanical properties, and can be used in automobiles, ships, and the interior decoration of high-class hotels.

The invention discloses a preparation method of a continuous graphene nanofiber bundle, and relates to the technical field of graphene fiber materials. The preparation method comprises the following steps: preparing and preparing a graphene oxide nanobelt solution, and adding a plasticizer to obtain a spinning solution; injecting the spinning solution into an electrostatic spinning device, performing near-field electrostatic spinning and air curing, and performing curing forming in a coagulating bath to obtain basic graphene oxide fibers; a plurality of fibers are assembled into nanofiber multifilaments in a coagulating bath, and then the nanofiber multifilaments enter a subsequent multi-stage combined drafting process to prepare a GO fiber aggregate; the GO fiber aggregate is immersed in a Lys-Dopa solution for a reaction, and finally the GO fiber aggregate is collected through a twisting process; reducing the collected GO fibers with hydroiodic acid to obtain reduced graphene fibers, and then performing high-temperature graphitization treatment to obtain a graphene nanofiber bundle product; the graphene fiber preparation process is improved from multiple aspects of raw material preparation, spinning and drafting, Lys-Dopa bath, twisting and the like, a new mechanical property improvement scheme is provided, and development of the graphene fiber field in the future is promoted.

The utility model provides a heating roller and rolling equipment, and the rolling equipment comprises a roller body, a heating device and a heating device, the multiple heating pieces extend in the length direction of the roller body, and the multiple heating pieces are evenly distributed in the roller body in the circumferential direction of the roller body; the heat pipe assembly is of an annular frame structure, the heat pipe assembly is arranged in the roller body, and the multiple heating pieces are located on the inner circumference of the heat pipe assembly. According to the heating roller, the heat pipe assembly is arranged in the roller body, and the heat pipe assembly has extremely high heat transfer efficiency, so that the heat pipe assembly can quickly transfer heat generated by the heating pieces on the peripheries of the heating pieces in the circumferential direction of the roller body, and the temperature difference of the circumferential surface of the roller body can be effectively reduced; the temperature uniformity of the surface of the roller body is improved; in addition, independent temperature control can be carried out on the multiple heating pieces, and the temperature uniformity of the surface of the roller body can be further guaranteed.

The invention relates to a method for preparing a coarse denier non-crimp dumbbell-shaped full-dull polyester staple fiber, wherein the full-dull polyester slice is dried, melted by a screw extruder, spun by a dumbbell-shaped special-shaped hole spinneret, cooled by short-distance blowing with a ring blow tube, wound, and dropped into a barrel to obtain a raw fiber, and the raw fiber is subjected to the steps of post-spinning bundling, first-stage oil bath drawing, second-stage steam drawing, tense heat setting, stacking and oiling, and cutting to obtain a coarse denier non-crimp dumbbell-shaped full-dull polyester staple fiber; the dumbbell-shaped special-shaped hole spinneret is The diameter is 220mm, the dumbbell-shaped hole length is 2.2±0.025mm, the dumbbell-shaped hole points to the center of the spinneret at 15°, the number of holes is 208, each circle has 52 holes, a total of 4 circles, the circle radial center distance is 9mm, the shortest distance from the spinneret surface to the top row of air holes of the ring blowing tube is 30mm, the wind speed is 1.7-1.8m / s; the winding speed is 1050-1150m / min; the nozzle stretching multiple is 160-190 times. The present invention effectively solves the problem that the coarse denier non-curled dumbbell-shaped full-dull polyester staple fiber has high defects and is dispersed.

The invention discloses a superfine high-strength meta-position aramid fiber and a preparation method thereof, and the superfine high-strength meta-position aramid fiber is obtained by adjusting the type of a wet spinning coagulating bath and reducing the temperature of the coagulating bath to realize super-stretching. Ethyl acetate and dimethylacetamide are used as a coagulating bath, and meanwhile, the temperature of the coagulating bath is reduced, so that the coagulating speed of the fiber in the coagulating bath is slowed down, the intermolecular force of the fiber is stronger, a more stable network gel state is formed, and very excellent stretchability is achieved. The meta-position aramid fiber prepared by the method has the advantages that the diameter is as small as 1.43 mu m, the tensile rate can reach 8000 times, the breaking strength reaches 1332 MPa, and the elongation at break is more than 20%.

The invention provides an anti-static knitted fabric based on charge gathering and directional guiding, a preparation method of the anti-static knitted fabric and a knitted fabric, and belongs to the technical field of knitted clothes. A first spinning component and a second spinning component are co-extruded through melt spinning to prepare composite fibers with a parallel composite structure, and the composite fibers are subjected to thermal mechanical treatment to obtain the composite yarn; the composite yarn is directionally introduced into a specific area of the fabric in a tuck-float stitch mode through an embedded weaving technology, and latent curl is activated through after-treatment. The moisture absorption expansion of the second spinning component is utilized to drive the composite yarn to macroscopically self-crimp, and the conductive filler inside is physically extruded to construct an efficient conductive skeleton, so that the humidity response adjustment and charge directional dispersion of the anti-static performance are realized, and the problems of fixed conductive state, local static accumulation and poor comfort of the existing fabric are effectively solved; and the safety and wearing experience of the clothes are improved.

The present invention relates to the technical field of polymer materials, and discloses ultra-high molecular weight polyethylene fiber and its preparation method and application. The preparation method of the ultra-high molecular weight polyethylene fiber comprises: step 1, swelling ultra-high molecular weight polyethylene, flame retardant and antioxidant in a solvent to obtain a swelling liquid; step 2, mixing, melting and extruding the swelling liquid in a twin-screw extruder to obtain a polymer melt; step 3, sending the polymer melt into a spinning tunnel for drawing to obtain ultra-high molecular weight polyethylene fiber; the feeding port temperature of the twin-screw extruder is 25-40°C, the temperature of the mixing and melting section is 80-180°C; the extrusion port temperature of the twin-screw extruder is 145-170°C; in the spinning tunnel, the spinning tunnel temperature is 75-140°C, and the air volume is 200-800N 3 / h; the drafting frequency of the drafting is 15-30. The ultra-high molecular weight polyethylene fiber provided by the invention has strong flame retardant, anti-aging and mechanical properties.

The invention belongs to the technical field of soft robots, and discloses a lockable driver based on artificial muscles and a driving method of the lockable driver. The driver comprises an artificial muscle bundle, a locking device and a flexible connector, the artificial muscle bundle is formed by weaving a plurality of CD-ROM liquid crystal elastomer fibers in a chain shape, and 30%-50% of reversible contraction deformation can be generated under illumination; the locking device is of a layer blocking variable stiffness structure, and millisecond soft-hard state switching is achieved through vacuum negative pressure. During driving, light initiates phase change shrinkage of the liquid crystal elastomer, and then the locking device is vacuumized to fix deformation; and the flexible state can be recovered by charging positive pressure when the pressure is released. The problems that a traditional flexible driver is high in standby energy consumption and poor in load capacity are solved, the high deformation capacity and the lockable rigidity are achieved, and the flexible driver can be widely applied to the fields of exoskeletons, rehabilitation instruments and the like.

This application discloses a method and application of aerogel fiber. The method includes mixing a solvent and a polymer material to form a spinning solution, using airflow spinning technology to drive the spinning solution with a high-speed airflow to form a jet, and forming a gel fiber through sol-gel conversion, and then performing solvent replacement on the gel fiber and drying to prepare aerogel fiber. The method of preparing aerogel fiber by airflow spinning provided by this application does not have high requirements for the gelation process of aerogel material, and if a spinning solution that meets the rheological conditions is obtained, aerogel fiber can be prepared by this method, avoiding the impact of insufficient gelation process on fiber performance, and at the same time improving the production efficiency of aerogel fiber and greatly simplifying the process. The prepared aerogel fiber has a unique porous structure, high specific surface area, high porosity, certain spinnability and excellent skeletal structure stability, and can be applied in fields such as spinning.

The invention discloses a flexible light heat-insulation streamline oxide nanofiber aerogel and a preparation method and application thereof.The fiber aerogel is prepared through preparation of a spinning precursor solution, an air flow spinning technology and a heat treatment process, the spinning solution is stretched into fibers through the air flow spinning technology, and under the influence of a flow field, the flexible light heat-insulation streamline oxide nanofiber aerogel is obtained. The fibers present streamlines with different curvatures, high-quality dry fibers are obtained through a heating field, and the high-quality dry fibers are stacked in a receiver to form a three-dimensional structure; and finally, the three-dimensional streamline oxide nanofiber aerogel with ultralow thermal conductivity and low density is obtained by combining thermal treatment with a folding process, has excellent thermal protection performance and can be widely applied as a light high-temperature-resistant thermal insulation material.

The invention discloses a self-softening one-way moisture-conducting environment-friendly fabric and a preparation method thereof, and belongs to the technical field of fabric weaving, the front face of the fabric is made of surface yarn chinlon filaments and polyester yarns, the lining is made of polypropylene spandex core-spun yarns, and the fabric is woven through a single-side knitting machine structure and has the characteristics of self-softening and one-way moisture-conducting. Compared with the prior art, the fabric is soft and comfortable, has good moisture permeability and environmental protection property, and is suitable for the fields of outdoor sports, fitness, daily casual clothes and the like.

The invention relates to the technical field of functional fiber materials, in particular to a fiber material with an antibacterial function and a preparation method thereof, and the preparation method comprises the following steps: S1, preparing composite antibacterial powder; s2, preparing antibacterial functional particles; s3, preparing a spinning solution; s4, performing wet spinning and post-treatment to obtain the fiber material with the antibacterial function. A triple antibacterial system is formed by constructing the ferroferric oxide core body, the zinc oxide middle layer and the chitosan shell and is fused into the fiber preparation process, and the fiber material which is excellent in antibacterial effect, resistant to washing and good in environmental adaptability and has the antibacterial function is obtained.

The invention relates to the technical field of textile materials, and particularly discloses high-strength screen cloth and a preparation method thereof. The high-strength screen cloth is prepared from the following raw materials: caprolactam, p-phenylenediamine, adipic acid, diphenyldicarboxylic acid, a modified monomer, zinc diethyl hypophosphite, divinyl benzene, modified glass fibers, an antioxidant and a lubricant. The preparation method comprises the following steps: preliminarily polymerizing caprolactam, p-phenylenediamine, adipic acid, biphenyldicarboxylic acid and the modified monomer, then adding the modified glass fiber, zinc diethyl hypophosphite and divinyl benzene for continuous reaction to obtain a polyamide copolymer, and finally performing melt spinning and weaving on the polyamide copolymer, the antioxidant and the lubricant to obtain the required high-strength mesh cloth. The high-strength screen cloth prepared by the invention has excellent mechanical properties and aging resistance, is suitable for being applied to the fields with high-performance requirements, such as constructional engineering materials and special protective equipment, and is high in practicability and wide in application prospect.

The invention discloses a solution jet spinning nanofiber yarn forming device, and relates to the technical field of yarn, the solution jet spinning nanofiber yarn forming device comprises a nanofiber generating mechanism, a fiber bundle compounding mechanism and a yarn collecting mechanism which are arranged in sequence, the nanofiber generating mechanism can utilize airflow to stretch spinning solution trickles to obtain nanofiber bundles, and the nanofiber bundles are arranged on the spinning solution trickles. The fiber bundle compounding mechanism is arranged at the outlet end of the nanofiber generating mechanism, the fiber bundle compounding mechanism receives nanofiber bundles generated by the nanofiber generating mechanism and forms nanofiber yarns, and the yarn collecting mechanism is used for winding and collecting the nanofiber yarns. The invention further discloses a method for preparing the nanofiber yarn through the device. The nanofiber yarn prepared through the device and the method has the advantages of being small in size, large in specific surface area, high in porosity, good in orientation degree, large in tensile strength, fluffy in structure, capable of achieving large-scale production and the like.

The utility model relates to the technical field of fiber wet spinning equipment, in particular to a water-soluble fiber washing and oiling device, which comprises a washing tank, a plurality of groups of rubbing components are arranged in the washing tank, each rubbing component comprises a yarn supporting rod and a yarn pressing rod, the yarn supporting rods are fixedly arranged in the washing tank, and tows pass through the upper surfaces of the yarn supporting rods. The yarn pressing rod is arranged in the washing tank in a sliding mode through the lifting assembly, and the tows pass through the lower surface of the yarn pressing rod. According to the utility model, the technical problem of poor fiber dispersity caused by poor treatment effect when the existing post-treatment device is used for treating endless tow semi-finished products can be solved.

The invention discloses a regenerated cellulose fiber based on gel spinning and a preparation method and application thereof, and belongs to the technical field of bio-based high performance. The preparation method comprises the following steps: activating a cellulose raw material with water / DMAc double solvents, and dissolving the activated cellulose raw material in a LiCl / DMAc system to form a spinning solution with the concentration of 5-15wt%; the solution is extruded out of a methanol coagulating bath with the temperature lower than the spinning solution gel point through a gel spinning technology, and the drafting rate is larger than or equal to 5 times; the nascent fiber is subjected to solvent replacement, washing and drying, and the regenerated cellulose fiber is obtained. The tensile strength of the prepared regenerated cellulose fiber reaches 664 MPa (2.2 times of that of viscose), and the elastic modulus is 41 GPa; the fiber roundness index is 0.80, and the surface smoothness Ra is less than or equal to 0.1 mu m (SEM verification); and the raw material cost is reduced by 30%.

The invention provides a flame-retardant regenerated cellulose fiber for environment-friendly and efficient clothing and a preparation method of the flame-retardant regenerated cellulose fiber, and relates to the field of regenerated cellulose fibers. The preparation method of the flame-retardant regenerated cellulose fiber for the environment-friendly and efficient clothing comprises the following steps: preparing an efficient flame retardant dispersing system, preparing a blended spinning stock solution, spinning and forming, and performing post-treatment. According to the environment-friendly and efficient flame-retardant regenerated cellulose fiber for clothing and the preparation method thereof, the flame-retardant performance of the flame-retardant regenerated cellulose fiber for clothing can be improved, the phosphorus content and the sulfur content of the flame-retardant regenerated cellulose fiber for clothing are reduced, the environment-friendly performance of the flame-retardant regenerated cellulose fiber for clothing is improved, the biological irritation is reduced, and the safety of clothing is improved; the mechanical property, the whiteness and the comfort of the flame-retardant regenerated cellulose fiber for clothing are further improved.

The invention discloses a moisture-absorbing and quick-drying polyester fabric and a preparation method thereof, and relates to the technical field of fabric fiber materials. The invention relates to a preparation method of a moisture-absorbing and quick-drying polyester fabric. The preparation method comprises the following steps: blending super-moisture-absorbing polyester fibers and spandex fibers to obtain blended yarns; weaving the blended yarn to obtain the moisture-absorbing and quick-drying polyester fabric. The super-moisture-absorption polyester is obtained by melting and cross-linking PET slices and carboxylated three-layer core-shell particles; the carboxylated three-layer core-shell particles are obtained by performing carboxylation treatment on the three-layer core-shell particles by gamma-aminopropyltriethoxysilane and pyromellitic dianhydride; the super-moisture-absorption polyester fiber prepared by the method has water-absorption quick-drying performance, high heat conductivity and certain ultraviolet protection performance, and the polyester fabric prepared by the method is applied to preparation of sun protection clothes and sportswear, so that the wearing comfort and functionality are greatly improved.

The invention provides a preparation method of fluoride-free anti-wicking polyester industrial yarn, and belongs to the technical field of polyester fibers. The preparation method comprises the following steps: preparing a hydrophobic oil agent by taking a polyurethane polymer or a polyurethane prepolymer as a main body; polyester chips are guided into a screw extruder to be subjected to melt extrusion and then flow out through a spinning assembly, and after primary oiling, drafting and heat setting are conducted, secondary oiling is conducted through a hydrophobic oil agent; and dynamically heating the tows subjected to secondary oiling through multiple rollers to finish fiber shaping and oil film curing, and winding to obtain the finished fluoride-free anti-wicking polyester industrial yarn with the wicking height of less than or equal to 7.5 cm. According to the invention, fluorine-containing waterproof oil agents such as C8 and C6 which are commonly adopted by current anti-wicking fibers are abandoned, polyurethane materials which have no toxic and harmful effects on human bodies are used as the anti-wicking oil agents, and the anti-wicking fiber has the characteristics of environmental protection, flexible oiling point location and simple and convenient operation, and can be easily realized by being matched with an existing melt spinning device.

The invention discloses a preparation method and application of a photoelectric collaborative flexible optical fiber, and belongs to the technical field of multifunctional flexible optical fiber preparation. Conductive fibers are prepared through a wet spinning / melt co-extrusion spinning process, the conductive fibers are placed in a hollow part of a hollow cladding preform of an optical fiber, and the photoelectric synergistic flexible optical fiber sensor is obtained through synchronous hot wire drawing. According to the invention, the flexible electrode is combined with the transparent high polymer material with good light guide performance to form the photoelectric cooperative sensing flexible optical fiber sensor with both light response and electric response, and the unique optical fiber structure not only achieves the photoelectric cooperative sensing function, but also plays a role in packaging the flexible electrode, so that the durability of the optical fiber sensor is higher. The fiber has excellent performances of flexibility, fatigue resistance and the like, can be used as optical fiber sensing equipment for monitoring human joint movement, and has huge application potential in the fields of optical fiber communication, sensing detection, biomedical treatment and the like.

The invention relates to the field of flame-retardant textile fabrics, and provides a comfortable flame-retardant aramid fabric and a preparation method thereof. The composite filler with the average length of 3.0-8.0 mu m and the diameter of 0.4-1.0 mu m is prepared by adopting the design of multielement blended composite fibers of hydroxyapatite / magnesium hydroxide composite filler, meta-aramid polymer, para-aramid polymer, polybenzimidazole and the like through a hydro-thermal synthesis process of performing silanization surface activation and accurately controlling the molar ratio of calcium to phosphorus to be 1.60-1.67. The preparation method comprises the following steps: preparing the composite filler with the average length of 3.0-8.0 mu m and the diameter of 0.4-1.0 mu m; then industrial production processes such as graded shearing dispersion, continuous wet spinning, multi-stage stretching heat setting and after-finishing are performed, so that synergistic improvement of flame retardant performance and comfort performance is achieved, and the technical problems that a traditional aramid fiber fabric is poor in flame retardant effect, poor in comfort, unstable in processing performance and the like are solved; the fabric has wide application value in high-end application fields such as fire protection clothing, industrial protection textiles and military protection equipment.

The invention discloses a modified ultra-high molecular weight polyethylene fiber as well as a preparation method and application thereof. The modified ultra-high molecular weight polyethylene fiber is prepared from 100 parts by mass of ultra-high molecular weight polyethylene resin, 3-10 parts by mass of modified nano composite ceramic particles, 2-8 parts by mass of modified aramid fiber, 1-5 parts by mass of modified carbon nanotubes and 1-3 parts by mass of an auxiliary agent through the processes of a two-stage blending method, dry-wet spinning, gradient hot stretching, pulse heat setting and the like. The tensile strength of the prepared modified ultra-high molecular weight polyethylene fiber is greater than 4.5 GPa, the elongation at break is kept at 5.0-5.5%, the cutting resistance is as high as 310N, the puncture resistance is as high as 465N, and the modified ultra-high molecular weight polyethylene fiber can be applied to protective products.