793results about "Wet spinning methods" patented technology

The invention relates to the technical field of textile material and fiber processing, in particular to a high-elasticity moisture-absorption breathable acetate fabric and a preparation method thereof. The invention discloses a high-elasticity moisture-absorption breathable acetate fabric and a preparation method thereof.The acetate fabric takes a bio-based degradable thermoplastic polyester elastomer as an island and acetate as a sea, a homothermal double-hole structure is embedded in the acetate fabric, and the surface of the acetate fabric is covered with a polyglutamic acid and chitosan oligosaccharide self-repairing hydrophilic layer; the preparation method comprises the following steps: pre-burying alkali-resistant microspheres in a marine facies through solid island-solution sea double-path spinning of a bio-based degradable thermoplastic polyester elastomer and acetate, synchronously forming groove-closed pore double channels through simultaneous heating one-step alkali etching-baking, and finally forming a dynamic reversible hydrogen bond network through polyglutamic acid and chitosan oligosaccharide, so as to obtain the marine-based degradable alkali-resistant hydrogel. A bio-based finishing layer with a self-repairing function is obtained, and the finally obtained fabric has the characteristics of high elasticity, breathability, lasting moisture absorption, greenness and degradability.

The invention discloses a preparation method of a flexible electromagnetic shielding type force sensor based on a coaxial structure, and belongs to the field of flexible electronics and intelligent sensors. According to the method, a coaxial wet spinning process is adopted, a core-sheath structure conductive fiber is constructed, a core layer is made of a multi-walled carbon nanotube (CNT) and thermoplastic polyurethane (TPU) composite material, and a sheath layer is made of a nickel-coated carbon nanotube (Ni-CNT) and TPU composite material. By regulating and controlling the proportion of the core sheath, the construction of the gradient conductive network is realized, and the sensing sensitivity, the electromagnetic shielding performance and the mechanical flexibility are improved. The obtained Ni-CNT-coated CNT fiber is made into fabric and integrated in a sensing glove, and multi-finger bending detection and wireless man-machine interaction control are achieved. The sensor has the advantages of high sensitivity, wide strain detection range and excellent electromagnetic shielding effectiveness, is suitable for the fields of intelligent wearing, anti-interference man-machine interface and fire-fighting equipment, and can also be expanded to complex application scenes such as aerospace teleoperation.

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 belongs to the field of intelligent materials, and discloses a nematic phase liquid crystal elastomer fiber and a method for optimizing the thermal shrinkage performance of the nematic phase liquid crystal elastomer fiber. According to the method, the mass ratio of a cross-linking agent pentaerythritol tetra (3-mercaptopropionate) (PETMP) to a chain extender 2, 2 '-[1, 2-ethanediyl bis (oxygen)] bis (ethanethiol) (EDDET) in an LCE spinning solution is accurately controlled through a wet spinning technology, and drafting and heat treatment processes are combined, so that the LCE fiber with adjustable and controllable heat shrinkage performance and mechanical performance is prepared. The invention aims to overcome the limitations of low response speed, low shrinkage rate, insufficient environmental stability and the like of the existing LCE fiber. The reversible thermal shrinkage rate of the fiber can reach up to 35%, the maximum shrinkage deformation can be completed within 2 seconds at the soonest at the temperature of 80 DEG C, and the maximum tensile strength can reach 170 MPa. And the catalyst has excellent oxidation stability (the mass retention rate is about 97%), and can maintain efficient thermal response in a water environment. And a new way is provided for development of high-performance intelligent materials.

The invention provides an anti-ionizing radiation fiber with high filling amount, high strength and high elasticity and a preparation method and application thereof, and belongs to the field of functional fiber materials.The preparation method comprises the steps that rare earth nitrate and citric acid are dissolved in an acidic alcohol aqueous solution, heated and stirred, the pH value is adjusted, sol is obtained, the sol is subjected to secondary heating treatment to obtain gel, and the gel is dried to obtain the high-filling-amount high-strength high-elasticity anti-ionizing radiation fiber. Aging, drying, grinding and calcining the gel to obtain rare earth composite powder; wherein the rare earth nitrate is a mixture of gadolinium nitrate, dysprosium nitrate and cerium nitrate; adding polyurethane into a mixed solution of DMF and xylene, stirring, adding the rare earth composite powder, stirring, and defoaming to obtain a spinning solution; preparing nascent fibers from the spinning solution through wet spinning; and drawing, washing and drying to obtain the anti-ionizing radiation fiber. The anti-ionizing radiation fiber prepared by the invention has excellent shielding property, mechanical property and air permeability.

The application relates to the technical field of aerogel fiber preparation, and discloses a polyimide aerogel fiber and a preparation method and application thereof. The preparation method comprises the following steps: preparing a polyamide acid precursor spinning solution; spinning the polyamide acid precursor spinning solution through a wet spinning method, winding and standing in a coagulation bath to obtain a polyimide wet gel fiber; and performing solvent replacement on the polyimide wet gel fiber and rapidly drying the polyimide wet gel fiber under normal pressure to obtain a polyimide aerogel fiber. The preparation method is simple, avoids the use of a lengthy drying process and expensive drying equipment, and successfully realizes continuous molding preparation, and has a good large-scale preparation prospect. The aerogel fiber prepared by the application has excellent tensile strength, which can reach 20.5 MPa; and has low density (0.34-0.53 g.cm ‑3 -3), high porosity (63-76%) and excellent heat insulation performance, and the thermal conductivity can be as low as 36.9 W.m ‑1 -1.K ‑1 -1; and has good heat preservation effect in various complex occasions.

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 provides a waste cotton fabric synchronous decolorization and cellulose dissolution regeneration method based on a deep eutectic solvent, and relates to the technical field of waste cotton fabric recovery treatment. According to the method disclosed by the invention, the in-situ decoloration of the dye in the cotton fabric and the efficient dissociation of a cellulose hydrogen bond network are synchronously realized under the process condition of 30-100 DEG C by selecting the specific eutectic solvent, so that the decoloration and the dissolution are cooperatively completed in the same step; and the problem of fiber damage or incomplete decoloration caused by condition conflict in step-by-step treatment is effectively avoided. On the basis, the dye and the eutectic solvent are synchronously replaced and separated in a coagulating bath by combining wet spinning, so that the process is simplified, and the high mechanical property of the regenerated cellulose fiber is realized. Besides, the dye and the deep-eutectic solvent in the process can be recycled, a resource full-circulation green technical path is formed, and a solution with a wide application prospect is provided for high-valued regeneration of the waste textiles.

The invention relates to a high-strength and high-modulus polyacrylonitrile carbon fiber precursor, a carbon fiber and a preparation method thereof, and belongs to the field of polyacrylonitrile-based carbon fiber preparation. A wet spinning process is adopted, the method comprises the solidification step of at least two solidification baths, and n spraying devices are arranged between every two adjacent solidification baths in the solidification process to spray solutions to bath separation fibers; the concentrations Cg (i-1) and Cgi of the polar organic solvent in two adjacent coagulating bath solutions and the concentration C1-Cn of the polar organic solvent in the solution of the spraying device between the two adjacent coagulating bath solutions meet the following relational expression: Cg (i-1) is greater than or equal to C1gt; c2gt; C2gt; gt,... gt; cn > = Cgi, i > = 2, and n > = 3. The method mainly solves the problems that in the prior art, the breaking elongation coefficient of protofilaments (monofilaments) is large, and the number of broken filaments is large in the solidification process. According to the technical scheme, the problems are well solved, and the method can be used for preparing high-performance carbon fibers.

The invention relates to a fiber with improved thermal insulation properties comprising a polymeric fiber base material and a microporous material in particle form, wherein the microporous material comprises an agglomerate of precipitated insoluble amorphous metal silicates, in particular precipitated silicon dioxide. The invention further includes a method for producing a fiber with improved thermal insulation properties.

To provide a method of manufacturing fibers having improved comfort and water and odor adsorption properties.SOLUTION: There is provided a method for making fibers, the method including: doping a liquid polymer with zeolite particles encapsulated in a sealing material, wherein the zeolite particles have an average diameter of 0.2 to 50 micron (inclusive) and are present in fibers at a concentration of 250 to 25,000 parts per million; forming fibers from the particle-doped polymer; and treating the fiber with 5 to 25% NaOH, LiOH, or KOH at about 80°C to 100°C for about 15 to 45 minutes to remove a portion of a surface layer of the fiber to form weight-reduced fibers, wherein the portion of the surface layer of the fiber that is removed has a thickness of about 0.1 to 10 times the average diameter of the zeolite particles, and wherein the fiber forms a multifilament yarn or a staple fiber with an odor adsorption or an odor activity value (OAV) of at least 15.SELECTED DRAWING: None

The invention relates to the technical field of flexible bioelectronics and biomedical sensors, in particular to a biocompatible flexible carbon-based physiological electrode prepared through coaxial spinning and application of the biocompatible flexible carbon-based physiological electrode. The conductive core is formed by crosslinking graphene oxide, carbon nanotubes and the like; the buffer layer contains polyurethane and the like, and shape memory microspheres and antibacterial nano-silver are added; a biological interface layer contains chitosan and the like, and PEG-PE is grafted to reduce protein adsorption; the thickness ratio of the three layers is 1: (1.5-2): (0.5-1), and the thickness is 100-300 microns; the electrode has conductive, sensing and antibacterial functions, can load double enzymes for blood glucose monitoring, is strong in interlayer bonding, and is suitable for various biomedical scenes. By innovating the three-layer structure and the material design, high conductivity, high flexibility and excellent biocompatibility are achieved; multi-parameter monitoring and electrical stimulation treatment can be achieved, the anti-bending performance is good, the antibacterial and anticoagulant effects are good, the preparation process is controllable, and the application prospects in the fields of wearable equipment, implantation medical treatment and the like are wide.

The invention relates to the technical field of aramid fibrid production, in particular to an aramid fibrid production device and a use method thereof. The aramid fibrid production device comprises a precipitation machine and a cleaning machine, the cleaning machine comprises a tank body with an opening in the top end, a first annular flange extending outwards is arranged at the top of the tank body, a first filter cylinder is arranged on the upper portion in the tank body, a second filter cylinder is rotationally sleeved with the first filter cylinder, and a barrel-shaped filter bag is sleeved with the second filter cylinder; the upper end face of the second filter cartridge extends out of the first filter cartridge and then is connected with a gear ring, a rotating shaft and a motor for driving the rotating shaft to rotate are rotationally arranged on the first annular flange, a gear meshed with the gear ring is arranged on the rotating shaft, and when the second filter cartridge rotates, filter holes of the first filter cartridge and the second filter cartridge can be mutually staggered to block or communicate. The aramid fibrid stock solution is obtained through the precipitation machine, then the aramid fibrid stock solution is efficiently cleaned through the cleaning machine, and finally the high-quality aramid fibrid is obtained.

A gel fiber manufacturing apparatus includes: a first ejection portion configured to eject a main liquid containing a core liquid; a second ejection portion provided to surround a radially outer side of the first ejection portion and configured to eject a sheath fluid that hardens the core liquid; and a sheath fluid supply portion configured to alternately apply to the sheath fluid a constant pressure and a high pressure to supply the sheath fluid to the second ejection portion, the high pressure being higher than the constant pressure.

The invention discloses a preparation method of an antibacterial warm-keeping fabric, and relates to the technical field of textiles. When the antibacterial warm-keeping fabric is prepared, firstly, (E)-butyl-2-ene-1, 4-diamine, glyoxal, formaldehyde and butyric acid are used as raw materials to synthesize a polyimidazolium salt antibacterial agent, then the polyimidazolium salt antibacterial agent is copolymerized with polytetrahydrofuran ether glycol and diphenylmethane diisocyanate to prepare an antibacterial polyurethane spinning solution, and the antibacterial fabric is obtained through wet spinning and weaving. The preparation method comprises the following steps: reacting L-cysteine with 3-amino propyl triethoxy silane to prepare cysteamine acyl propyl triethoxy silane, reacting with formaldehyde and phosphorous acid to obtain flame-retardant modified silane, and further preparing a silicon dioxide solution from the flame-retardant modified silane and sol-gel such as methyltrimethoxysilane; finally, the antibacterial fabric is treated with a benzophenone solution and then soaked with a silicon dioxide solution, and the antibacterial thermal fabric is prepared through ultraviolet irradiation, standing gelation, aging and hexane washing. The prepared fabric has excellent antibacterial property, heat retention property and flame retardant property.

The invention relates to a biodegradable continuous tubular reactor, the wall of which comprises at least one cylindrical layer based on a polyanionic compound chelated by an at least divalent cation, and the central space of which comprises a cross-linkable fluid free of polyanionic compound.

The invention discloses a tough hypha structure and a culture method thereof. The tough hypha structure comprises a porous hollow support carrier, culture medium cloth and a hypha layer. The porous hollow support carrier comprises a support framework and a plurality of carrier holes penetrating through the support framework. The culture medium cloth is arranged on the porous hollow support carrier and comprises biomass nutrient fibers completely laid on the porous hollow support carrier and a plurality of fiber holes penetrating through the biomass nutrient fibers. The mycelium layer is arranged in the carrier holes and the fiber holes in a surrounding and penetrating mode, extends up and down and completely wraps the porous hollowed-out supporting carrier and the culture medium cloth, and the diameter of each carrier hole ranges from 10 micrometers to 1000 micrometers and is larger than that of each fiber hole. The invention further provides a culture method of the tough hypha structure. The porous hollow support carrier is used as a bottom support structure, so that the growth uniformity of mycelia can be improved. By adopting the porous hollow support carrier and the culture medium cloth, the flexibility, the structural strength and the ductility of the tough hypha structure can be improved.

The invention belongs to the technical field of polylactic acid fibers, and particularly relates to a method for preparing polylactic acid fibers based on wet spinning. The preparation method comprises the following steps: firstly, pretreating polylactic acid particles, and fully drying the polylactic acid particles in an electrothermal forced air drying oven to remove moisture; 1, 4-dioxane is used as a solvent, dioctyl phthalate is used as a flexibilizer, the dried polylactic acid particles are dissolved in a mixed system of the solvent and the flexibilizer, heating and stirring are conducted till complete dissolution is achieved, and a spinning solution is prepared; performing centrifugal treatment by a centrifugal machine to eliminate bubbles in the spinning solution; sequentially carrying out spinneret orifice extrusion, coagulating bath forming, drafting and winding processes on the defoamed spinning solution to finally obtain the polylactic acid fiber. The method is simple and controllable in process, effectively improves the continuity and mechanical properties of the fibers, and is suitable for large-scale preparation of biodegradable fibers.

Process and products for producing a solution-spun multifilament yarn containing n filaments are provided, wherein an ultra-high molecular weight polyethylene (UHMWPE) solution containing UHMWPE polymer and a solvent for the UHMWPE polymer are spun through n spin-holes of a spin plate and drawn before, during or after removal of the solvent to thereby obtain the multifilament yarn containing n filaments, the yarn having a tenacity (Ten) as expressed in cN / dtex of Ten(cN / dtex)=f×n−0.05×dpf−0.15, wherein Ten is at least 39 cN / dtex, n is at least 25, f is a factor of at least 62.0 and dpf is the dtex per filament.

The invention relates to a composite fiber and a preparation method thereof. The composite fiber comprises: a core comprising MXene polymer fibers, wherein MXene is distributed as stacked nanosheets within a first polymer; a first coating of organic molecules based on benzoic acid on the MXene polymer fibers; a second polymer in the form of fibers on the first coating; and a second coating of a thermoplastic polymer having a thermal strain of about 80 DEG C or higher. Methods for making composite fibers involve mixing MXene and a first polymer, depositing a first coating, stranding and twisting with a second polymer, and applying a second coating. The first polymer may include polyacrylonitrile (PAN) and the second polymer may include a material such as nylon or polyethylene terephthalate (PET). The method includes steps such as wet spinning and surface treatment at elevated temperatures.

The invention discloses a polyetherketoneketone fiber anti-adhesion porous spinning method. The method comprises the following steps: dissolving polyetherketoneketone to obtain a spinning solution, and extruding the spinning solution through a porous spinneret plate to form a plurality of spinning trickles; the trickles enter a first coagulating bath to be preliminarily coagulated and formed, and fibers are obtained; dividing the fibers by a split type dividing plate, guiding the fibers into a second coagulating bath by a godet, washing with water, applying oil, and then drying; fibers enter the hot drafting device to be subjected to multi-stage hot drafting, and after heat setting, the fibers are tidied and wound by the buncher. The first coagulating bath is provided with a bath lotion supplementing unit, a circulating filtering system and an ultrasonic generator which are combined to quickly and uniformly update components of the coagulating bath; and the split type filament separating plate keeps a distance between fibers, prevents mutual adhesion and improves the double-diffusion efficiency in the second coagulating bath. The ultrasonic-assisted circulating filtration system is used for updating the synergistic effect of the coagulating bath and the split type filament separating plate, so that the problems that fibers are easy to adhere and are uneven in evenness and performance are effectively solved.

The invention belongs to the field of fiber materials, and provides a hollow acrylic fabric with thermal insulation performance and a preparation process thereof. The composite design of an acrylonitrile-based copolymer shell layer and an inner cavity silicon dioxide aerogel layer is adopted, a boric acid ester cross-linked network is formed through borax bath treatment to lock a three-dimensional crimp structure, and a hydrophobic modified silicon dioxide aerogel layer with the thickness of 50-200 nm is constructed in a fiber inner cavity; the mechanical-structural synergy that the single-fiber breaking strength is not lower than 3.5 cN / dtex under the condition that the hollowness degree is 30%-45% and the fiber dry-state crimp number is not smaller than 12 / 25 mm is achieved, the thermal resistance of the fabric reaches 0.065 m.K / W to 0.075 m.K / W, the air permeability is kept at 150 mm / s to 250 mm / s, and the fabric has the advantages of being good in air permeability, good in air permeability and the like. The contradiction between mechanical bearing and hollow structure design under the high-solid-content wet spinning fine denier condition, the contradiction between structural stability and fatigue durability of boric acid ester cross-linked three-dimensional curl after multiple times of water washing and the contradiction between low gram weight and high thermal resistance and the heat transfer mechanism of breathable comfort are solved, and the wide warm-keeping garment application value is achieved.

The application discloses a preparation method of a samarium trioxide doped lead zirconate titanate lead niobate piezoelectric fiber sensor. The application first prepares samarium trioxide doped lead zirconate titanate lead niobate ceramic; the ceramic is ground into powder and added into a sodium alginate solution, sodium dodecyl sulfate and citric acid are sequentially added, excessive water is added into the solution to obtain a low-viscosity slurry; then ball milling is carried out to break the agglomerates and obtain a uniform suspension, finally the slurry is injected into a CaCl2 solution to obtain a fiber, and the fiber is dried at room temperature and then calcined for the third time. The application precisely controls the molar ratio of raw materials, the reaction temperature, the reaction time and the doping ratio, guarantees the high-quality preparation of PNN-PZT / x Sm2O3 ceramic and fiberized piezoelectric ceramic, and makes the prepared piezoelectric fiber sensor have excellent piezoelectric performance and can more sensitively detect external signals.

The present invention provides super-tough cellulose aerogel fibers, a preparation method thereof, and uses thereof. The preparation method adopts wet spinning technology, prepares a cellulose molecular-level solution using a cellulose polymer as a raw material, uses the cellulose molecular-level solution as a spinning solution, and causes in-situ self-assembly and hydrogen bond cross-linking reaction of the cellulose polymer in the spinning process to form a multi-layer nanofiber structure, and the nanofiber structure is a continuous three-dimensional multi-stage pore network structure. The cellulose aerogel fibers prepared by adopting the technical solution of the present invention not only have excellent physical properties such as high strength and high toughness, but also have good adsorption and heat preservation performance due to their multi-stage pore structure, and can be applied not only to the technical field of textiles, but also to technical fields such as air purification, heavy metal adsorption, inhalation particulate matter adsorption, indoor harmful gas adsorption, filter materials or heat insulation materials, and can be widely applied.

Mechanically and piezoelectrically anisotropic polymer fibers may be formed by spinning a polymer solution or gel that includes a high molecular weight crystallizable polymer and a liquid solvent. The solvent may be configured to interact with the polymer to facilitate chain alignment and, in some examples, create a higher crystalline content within the spun fibers. The polymer solution may also include a low molecular weight additive. The high and low molecular weight polymers may each be characterized by a bimodal molecular weight distribution where the molecular weight of the additive is less than the molecular weight of the crystallizable polymer. The polymer(s) and the additive(s) may be independently selected from vinylidene fluoride, trifluoroethylene, chlorotrifluoroethylene, hexafluoropropene, vinyl fluoride, etc. The spun fibers may be oriented, annealed, poled, and woven or laminated to form a polymer thin film having a high elastic modulus and a high electromechanical coupling factor.

An optimized process for the preparation of a spinning solution for the production of acrylic fiber precursors (PAN) of carbon fibers and an optimized process for the production of carbon fibers from said acrylic precursor (PAN), are described.

The application relates to the technical field of fabrics, in particular to a fabric based on protein fiber combined with natural fiber and a preparation method thereof, which is prepared by wet core-sheath composite spinning of a down protein sheath layer and a natural cellulose core layer; the core layer is natural cellulose fiber, and the total mass of the functional fabric is 70-90%; the balance is the sheath layer formed by cross-linking and solidification of a down protein solution; and the sheath layer is loaded with nano titanium dioxide; the introduced natural cellulose core layer is the main skeleton component of the fabric, selects natural fibers such as bamboo pulp cellulose and cotton linter pulp, and provides basic mechanical support for the fabric. The abandoned down resource is used to prepare protein fiber, which is combined with natural cellulose fiber to construct a composite fiber with a functional sheath layer and a mechanical core layer. The technical scheme solves the problems of insufficient sun protection, insufficient antibacterial performance and single mechanical performance of traditional natural fiber fabrics.

A method of integrated and improved one-step production of carbon fiber precursors is described, in particular from comonomer start up until the spinning step to obtain the final fiber precursor.

To provide wet-spinning fibers of β-1,3-glucan containing β-1,3-glucan as the sole constituent molecule and a method for their production, and submicron fibrils and a method for their production.SOLUTION: Wet-spinning fibers containing only β-1,3-glucan represented by a specific chemical formula (1) as a constituent molecule. A method for producing wet-spinning fibers, comprising preparing viscose from a raw material β-1,3-glucan represented by a specific chemical formula (1) (I), or preparing spun fibers from the raw material β-1,3-glucan by a method (II) of dissolving the raw material β-1,3-glucan in a good solvent.SELECTED DRAWING: Figure 5B