846results about "Stretch-spinning methods" patented technology

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 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 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.

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 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 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 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.

The invention relates to the technical field of fiber materials, in particular to a polydopamine modified polypropylene antistatic fiber and a preparation method thereof. The antistatic polypropylene fiber overcomes the problems of poor antistatic effect and mechanical property of the polypropylene fiber. The preparation method comprises the following steps: carrying out step-by-step mixing, melt extrusion, spinning, drafting and heat setting on raw materials such as polypropylene slices, polydopamine modified polypropylene, carbon nanotubes, modified titanium dioxide, modified graphene and the like to obtain the antistatic fiber. The polydopamine modified polypropylene is obtained by modifying polypropylene with dopamine hydrochloride; the modified titanium dioxide is obtained by modifying nano titanium dioxide by using 3-aminopropyltriethoxysilane; the modified graphene is obtained by sulfonating graphene oxide and adding octadecylamine for modification. All the materials and the process cooperate with each other, an antistatic system is constructed on the surface and in the fiber, and meanwhile the mechanical property is improved. The fiber prepared by the method is excellent in antistatic effect and mechanical property, and has a good application prospect.

The invention discloses a jacquard vamp material based on bio-based degradable polylactic acid (PLA) and a preparation method thereof, and relates to the technical field of shoe materials. The jacquard vamp material is of a three-layer jacquard structure formed by integrally weaving PLA composite filaments through a jacquard warp knitting machine. The PLA composite filament is prepared from the following raw materials in parts by weight: 80-95 parts of polylactic acid (PLA) slices, 5-15 parts of poly (butylene adipate / terephthalate) (PBAT), 3-8 parts of a flexibilizer, 1-3 parts of a compatilizer, 0.5-2 parts of an anti-hydrolysis agent and 0.5-1.5 parts of a lubricant. According to the invention, the bio-based PLA is used as a main raw material and is matched with degradable auxiliaries such as PBAT, so that the whole vamp material can be completely biodegraded under a composting condition, the problem of environmental pollution of a traditional vamp is fundamentally solved, and meanwhile, through blending modification of PBAT and the flexibilizer, the flexibility and impact resistance of the PLA material are remarkably improved, and the vamp material has good application prospects. The requirements of the vamp material on softness, wear resistance and durability can be met.

The invention discloses a method for preparing polyester industrial filaments by recycling polyester chips from waste spinning products and the polyester industrial filaments, and belongs to the technical field of chemical fibers. The method comprises the following steps: by taking waste spinning product recycled materials as raw materials, carrying out solid-phase tackifying on the polyester chips recycled by a DMT method to obtain high-viscosity chips; extruding and melting the high-viscosity slices to obtain a spinning melt; extruding the spinning melt to obtain a melt trickle; carrying out slow cooling treatment on the melt trickles, and cooling through circular blowing or lateral blowing to obtain a strand body; the filament body is stretched and shaped, then low polymer blowing and winding are carried out, and the industrial polyester filament is obtained. According to the method, the waste spinning products are used for recycling raw materials, the production process is optimized, resources are saved, incineration is reduced, carbon emission is avoided, landfill is reduced, environmental protection is facilitated, land occupation is reduced, and human health is protected; and good performance and qualified rate of the product are ensured, so that the physical performance, broken filament performance and spinnability of the final product can meet the requirements.

The invention relates to the technical field of micro-nano fiber preparation, and discloses an air jet spinning device and process for large-scale micro-nano fiber preparation, the device comprises a shell, a multi-row hole coaxial spinneret plate, a feeding mechanism, an air exhaust pipeline and a control panel; a moving platform and a rotating shaft receiving mechanism are mounted in the shell, and a driving part is mounted on the moving platform; the multi-row hole coaxial spinneret plate is mounted at the moving end of the moving platform; the feeding mechanism comprises a quantitative liquid supply assembly and a high-pressure air supply assembly, the quantitative liquid supply assembly and the high-pressure air supply assembly are both communicated with the multi-row hole coaxial spinneret plate, and a heating element is installed on the high-pressure air supply assembly; one end of the exhaust pipeline is fixedly connected and communicated with the shell, and the other end is provided with an air pump; and pipeline heating equipment, a first electromagnetic valve, a solvent cooling and recycling assembly and a second electromagnetic valve are mounted on the air exhaust pipeline. According to the invention, large-scale continuous and uniform spinning of micro-nano fibers can be realized, efficient recovery of the solvent is realized, and the spinning scale and efficiency are effectively improved.

The invention relates to the technical field of fabrics, in particular to a cool-feeling long cilia strip and a preparation method thereof.The cool-feeling long cilia strip is composed of cool-feeling fibers and a long cilia strip base material and is characterized in that the cool-feeling fibers comprise a core layer, a functional skin layer and an outer thin skin layer; the functional skin layer is prepared from the following components: a sulfonated copolyester matrix, catechol grafted master batch, surface modified zeolite nano powder, an anti-hydrolysis agent and an antioxidant, and the functional skin layer also contains introduced Zn < 2 + > and Mg < 2 + >. Zn < 2 + > and Mg < 2 + > which are stably combined on anchoring points of sulfonated copolyester are subjected to hydration endothermic reaction when being in contact with water, so that a cool feeling is generated; the surface modified zeolite nano powder synergistically enhances moisture absorption and water temporary storage by virtue of the specific surface area, and continuously provides water for an ionized hydration reaction to prolong and amplify a cool feeling effect; the catechol grafting structure endows the fiber with antibacterial performance, and long-term stability of the structure is ensured through an interface enhancement effect. And the outer layer hydrophilic polyester is matched, so that the product has comfort, durability and functionality.

The invention discloses a high-color-fastness washable polyethylene fabric and a preparation process thereof in the field of functional polymer materials. The high-color-fastness washable polyethylene fabric is prepared from the following raw materials: polyethylene resin, maleic anhydride-acrylic acid copolymer grafted polyethylene, dopamine-silane composite modified polyethylene, magnesium stearate and an antioxidant. Wherein the maleic anhydride-acrylic acid copolymer grafted polyethylene is prepared by copolymerizing maleic anhydride and acrylic acid and then blending and granulating with polyethylene, and carboxyl and acrylate groups are introduced to enhance the binding force with dye; the dopamine-silane composite modified polyethylene is prepared through polyethylene surface hydroxylation, dopamine self-polymerization modification and silane grafting reaction, and the acting force and hydrophobicity between fibers are doubly improved through a catechol group and an epoxy group. According to the prepared fabric, the color fastness and the washing resistance are remarkably improved, meanwhile, the original characteristics of light weight and chemical corrosion resistance of polyethylene are kept, and the application scene is expanded.

The utility model discloses a bundling and drafting device for geotextile spinning and a geotextile production line, the bundling and drafting device comprises a bundling and drafting box, and a first drafting roller unit, a second drafting roller unit and a third drafting roller unit which are arranged in the bundling and drafting box, and the drafting speeds of the three drafting roller units are sequentially increased; each drawing roller unit comprises a plurality of drawing rollers which are parallel to one another, and the three drawing roller units sequentially draw a fiber bundle which is formed by a plurality of fibers and enters the bundling drawing box; therefore, the fiber bundles are mechanically bundled and drafted through the three drafting roller units with the drafting speeds sequentially increased, the fiber drafting process in the spinning process is optimized, in addition, the geotechnical cloth production line provided with the bundling and drafting device can adapt to polyester raw materials with higher viscosity, the tensile strength of the prepared polyester geotechnical cloth is improved, and the production efficiency is improved. And the drafting speed of the polypropylene fibers can be increased, so that the tensile strength of the prepared polypropylene geotextile is improved.

The invention relates to the technical field of polyamide fiber manufacturing, and provides a porous polyamide fiber preparation method which comprises the following steps: respectively feeding skin layer polyamide, a cross-linking agent and core layer polyamide into a mouth mold; the pore-foaming agent is decomposed to generate gas, and the gas forms a uniform closed-pore structure in situ on the core layer chinlon; in the fusion cavity, the cross-linking agent is sandwiched between the core layer chinlon and the skin layer chinlon to generate a chinlon material with a skin-core chinlon cross-linked structure; after being pulled out through a spinning nozzle, the chinlon material is bundled through an oiling roller, and after oiling, chinlon fiber tows are formed; the polyamide fiber tows are subjected to graded stretching and winding forming, and finished polyamide fiber products are obtained. Therefore, a uniform closed pore structure is formed in the core layer chinlon through the gas decomposed by the pore-forming agent; a skin-core chinlon cross-linked structure with chemical bonding and low-heat-conduction network functions is formed between the core layer and the skin layer through a cross-linking agent. The thermal conductivity and the weight of the polyamide fiber are remarkably reduced, meanwhile, the polyamide fiber has high strength, and the light and warm-keeping polyamide fiber is obtained.

The invention relates to the technical field of sewing thread preparation process optimization, in particular to a preparation process optimization method and system based on polytetrafluoroethylene sewing threads, and the method comprises the steps: obtaining a polytetrafluoroethylene resin particle set, obtaining a clean resin particle set, the use amount of magnetic nano filler, the use amount of a lubricant and the use amount of an antioxidant; performing stretching operation on the formed sewing threads, monitoring the formed sewing threads in real time, obtaining a stretching ratio and initial stretching sewing threads, calculating the crystallinity of the initial stretching sewing threads, performing heat setting on the optimal stretching sewing threads, obtaining optimal sewing threads, and summarizing the optimal sewing threads and optimal stretching parameters; an optimal sewing thread set and an optimal stretching parameter set are obtained, a stretching parameter database is constructed on the basis of the optimal stretching parameter set, and preparation process optimization based on the polytetrafluoroethylene sewing thread is completed on the basis of the optimal sewing thread set and the stretching parameter database. The quality and the performance of the polytetrafluoroethylene sewing thread can be improved.

The invention provides a composite spinning process of a high-elasticity chemical fiber blended yarn, which comprises the following steps: a multi-layer co-extrusion step: synchronously extruding core layer thermoplastic polyurethane, middle layer nano modified polyester and outer layer polyamide 66 in a molten state through a coaxial three-channel spinning assembly to form a nascent fiber with a core-sheath structure, the middle layer nano modified polyester contains silicon dioxide nano particles; the extruded nascent fibers are immediately guided into a low-temperature shock cooling air field at the temperature of 5 + / -1 DEG C, and the length L of a cooling area and the linear speed v of the fibers meet the relational expression t = L / v > = 0.8 s; the cooled fibers are guided into a constant-temperature water bath at the temperature of 40 + / -2 DEG C, first-stage stretching and second-stage stretching are sequentially carried out, in the first-stage stretching process, stretching is carried out at the speed of 2.5-3.0 m / min till the original length is 130%, and after the first-stage stretching process is carried out for 10 seconds, the fibers are loosened and retracted till the original length is 120%; and in the second-stage stretching, stretching is continued at the speed of 1.8-2.2 m / min until the original length is 150%, and after keeping for 15 seconds, the stretching is finally retracted until the original length is 130%.

The invention discloses a preparation method of a warm-keeping and health-care composite fabric, and relates to the technical field of functional fabrics. The preparation method comprises the following steps: firstly, combining fumed silica with graphene oxide hydrogel to prepare mixed aerogel; the mixed aerogel is combined with allyl trichlorosilane, and is grafted to a macromolecular chain of polypropylene through maleic anhydride, so that the compatibility is improved, and the agglomeration problem is solved; secondly, calcining tourmaline, then directly carrying out quenching hydration modification, combining Si-OH groups on the surface with active groups in a polyester molecular chain, and spinning into hollow fibers; the mixed aerogel can absorb far infrared rays dissipated and emitted by the modified tourmaline, and the aerogel absorbing the far infrared rays can generate a resonance effect and a warm effect and permeate into the deep layer of the skin; the modified tourmaline has the capability of generating negative ions, and the gull rock powder is added for combined action, so that the antibacterial effect is achieved by destroying the structure of bacteria, and the health-care effect is achieved. The composite fabric prepared by the invention has warm-keeping and health-care effects.

A polyethylene copolymer may comprise about 90 wt % to about 99.99 wt % ethylene and about 0.01 wt % to about 10 wt % an alpha-olefin that is not ethylene, wherein the polyethylene has: a density of about 0.930 g / cm3 to about 0.955 g / cm3, a melt flow index (2.16 kg at 190°° C.) of about 10 g / 10 min to about 50 g / 10 min, a melt flow index ratio (MIR) of about 15 to about 25, a weight average molecular weight to number average molecular weight ratio (Mw / Mn) of about 2 to about 4, a wt % of TREF elution at 90° C. and less of about 10 wt % to about 80 wt %, and a wt % of TREF elution at 95° C. and greater of about 3 wt % or more. Said polyethylene may be especially well-suited for making bicomponent fibers, which may be useful producing in nonwoven fabrics.

The application relates to the field of nylon fiber processing, and discloses a preparation device for high-strength nylon fibers, which comprises a cleaning chamber, a drying chamber fixedly connected to one side of the cleaning chamber, a cleaning mechanism arranged in the cleaning chamber, a drying mechanism arranged in the drying chamber, a tension control mechanism arranged at the middle part of the right end of the drying chamber, a broken wire alarm mechanism arranged at the upper side of the right end of the drying chamber, two fixing tables of the cleaning mechanism, the fixing tables being fixedly connected to the inner sides of the cleaning chamber, and rotating rings movably connected to the inner side ends of the fixing tables. The cleaning mechanism and the drying mechanism are added, the nylon fibers can be strongly cleaned before being stretched, the dirt remaining on the surface can be removed, the drying mechanism can gradually heat and dry, the internal structure of the material can be prevented from being damaged, the nylon fibers can be preheated, the stretching performance and the plasticity of the nylon fibers can be improved, and the strength of the finished product can be improved.

The invention belongs to the technical field of industrial production and intelligent optimization, and discloses a multi-objective optimization method for regenerated polyester fibers, and the method comprises the steps: (1) constructing a data set containing a plurality of first-class regenerated polyester fiber formulas; (2) generating a plurality of second-class regenerated polyester fiber formulas by using a random function according to the types of raw materials in all the first-class regenerated polyester fiber formulas; (3) taking a plurality of second-class regenerated polyester fiber formulas as individuals of an initialized population of an NSGA-II genetic algorithm, and iterating until the number of iterations exceeds the maximum number of iterations to obtain a Pareto frontier solution set of the last iteration so as to realize multi-objective optimization of the regenerated polyester fibers; performing non-dominated sorting on the individuals according to an objective function and a constraint condition in each iteration to obtain a plurality of non-dominated sets; the objective function comprises a performance function and a raw material cost function of the regenerated polyester fiber. According to the invention, the problem of multi-target conflict between cost and performance can be solved synergistically.

The present application relates to a kind of through-hole type ultra-high molecular weight polyethylene fiber, its manufacturing method and its application.The manufacturing method of the through-hole type ultra-high molecular weight polyethylene fiber of the present application includes the following steps: 1) mix ultra-high molecular weight polyethylene, acid-soluble inorganic particles and solvent to prepare spinning solution, 2) extrude the spinning solution to form spinning stream, 3) remove at least a portion of the solvent from the spinning stream to obtain dry protofilament, 4) stretch the dry protofilament in two or more stages, and at the same time as the one or more stages of these stages are carried out, spray acid solution to the dry protofilament to dissolve the acid-soluble inorganic particles, obtain the through-hole type ultra-high molecular weight polyethylene fiber.The through-hole type ultra-high molecular weight polyethylene fiber of the present application can float on seawater and quickly absorb oil, solving the problem of fast diffusion and difficult collection of oil spill.

The invention provides a polyacrylonitrile dry densified fiber, a steam-drawn fiber, and a preparation method and application of the polyacrylonitrile dry densified fiber and the steam-drawn fiber. The polyacrylonitrile dry densified fiber is prepared by wet spinning and then drying and densifying; the drying densification is performed in one section and has four temperature zones; the temperature difference between every two adjacent temperature zones is 5-20 DEG C; the preparation method of the polyacrylonitrile dry densified fiber comprises the following steps: preparing a polyacrylonitrile copolymer spinning solution, carrying out wet spinning, and carrying out drying densification to obtain the polyacrylonitrile dry densified fiber. And carrying out steam drafting on the polyacrylonitrile dry densified fiber by 1.5-3 times to obtain the polyacrylonitrile steam drafting fiber. The polyacrylonitrile dry densified fiber prepared by the invention has the advantages of small quantity of broken filaments in the dry densification process, small dispersion coefficient of fineness and good mechanical property.