2955results about "Wet spinning methods" patented technology

This invention relates to a process of melt blowing a cellulose solution through a concentric melt blown die with multiple rows of spinning nozzles to form cellulosic microfiber webs with different web structures. The process comprises the steps of (a) extruding a cellulose solution (dope) through a melt blown spinneret with multiple rows of spinning nozzles; (b) drawing each individual extrudate filament to fine fiber diameter by its own air jet; (c) coagulating and entangling the fine fibers with a series of pressured hydro needling jets of recycling solution of the mixture of cellulose solvent and non-solvent in the spin-line; (d) collecting the stream of microfibers, air and needling jets on a moving collecting surface to form cellulosic fiber web; (e) hydro-entangling the said pre-bonded web downstream with at least one set of hydro needling jets of recycling solvent/non-solvent solution for forming well bonded nonwoven web; (f) regenerating the fine fibers in at least one bath for at least 5 seconds; (g) further regenerating and washing the fine fibers in another bath for at least 5 seconds; (h) pinching the well bonded melt blown cellulosic nonwoven with pressure rollers to remove major portions of the non-solvent; (i) drying the nonwoven web by heat, or vacuum or both, and (j) winding the nonwoven web into rolls.

Generally, the present invention is directed to, in one embodiment, a method for forming a composite nonwoven web configured to deliver skin wellness agents to the skin of a user. According to the method, an aqueous system of a hydrophilic polymer and a skin wellness agent is formed. The aqueous system is then electrospun onto a surface of a nonwoven web containing synthetic fibers. The resulting nanofibers have an average diameter of from about 50 nanometers to about 5000 nanometers, such as from about 200 nanometers to about 700 nanometers.

Coagulation spinning produces structures such as fibers, ribbons, and yarns of carbon nanotubes. Stabilization, orientation, and shaping of spun materials are achieved by post-spinning processes. Advantages include the elimination of core-sheath effects due to carbonaceous contaminants, increasing mechanical properties, and eliminating dimensional instabilities in liquid electrolytes that previously prohibited the application of these spun materials in electrochemical devices. These advances enable the application of coagulation-spun carbon nanotube fibers, ribbons, and yarns in actuators, supercapacitors, and in devices for electrical energy harvesting.

The invention relates to a method of nanofibres production from a polymer solution using electrostatic spinning in an electric field created by a potential difference between a charged electrode and a counter electrode. The polymer solution (2) is for spinning supplied into the electric field using the surface of the rotating charged electrode (30), while on a part of the circumference of the charged electrode (30) near to the counter electrode (40) is a spinning surface created, by which is a high spinning capacity reached. Further the invention relates to a device for carrying out the method, where the charged electrode (30) is pivoted and by its (bottom) part of its circumference it is immersed in the polymer solution (2), while against the free part of the circumference of the charged electrode (30) is positioned the counter electrode (40).

The invention relates to a process for forming fibers from a spinning solution utilizing a high speed rotary sprayer. The fibers can be collected into a uniform web for selective barrier end uses. Fibers with an average fiber diameter of less that 1,000 nm can be produced.

Said invention discloses a bamboo charcoal viscose fiber and producing method. The bamboo charcoal is finely selected, coarse cracked, dust removed, trash extracted, and pulverized to less than 0.5 micrometer, the bamboo charcoal micropowder and dispersant are put in water to made into aqueous emulsion slurry, filtered four times by two-layer of poplin filter fabric, respectively spinning in filament spinning machine and shorts spinning machine to obtain said bamboo charcoal viscose fiber which has bacteriostasis and antibiotic effect.

The invention relates to a preparation method of ultra-high molecular weight polyethylene fiber, which comprises the following steps: firstly, mixing ultra-high molecular weight polyethylene powder with solvent for swelling to obtain suspending liquid, and then extruding and dissolving the suspending liquid through a double screw extruder to obtain 4-25 percent of spinning solution, wherein the solvent is liquid hydrocarbon under room temperature; secondly, spraying and cooling the spinning solution to obtain gel filament; thirdly, applying 1-10 times of pretensioning to the gel filament, settling the pretensioned gel filament for 12-48h, extracting and drying the gel filament; fourthly, applying 4-130 times of heat drawing to the dried gel filament 70-160 DEG C to obtain the ultra-high molecular weight polyethylene fiber. After the gel filament is formed and pretentioned to a certain degree, the primary filament can be more uniform and has higher tension property , and the ultra-high molecular weight polyethylene fiber with excellent property can be prepared.

The invention provides multifunctional viscose. The multifunctional viscose comprises viscose, graphene and nano-silver, wherein nano-silver is loaded to a graphene slice layer in situ. The invention further provides a preparation method of the multifunctional viscose. The preparation method is characterized by comprising the following steps: (a) dispersing graphene in a water solution, so as to obtain a graphene dispersion liquid; (b) dissolving silver salt into the graphene dispersion liquid, adding a reducing agent, and carrying out reduction reaction, so as to obtain nano-silver-loaded graphene dispersion liquid; and (c) uniformly mixing the nano-silver-loaded graphene dispersion liquid with viscose liquid, and carrying out spinning, so as to obtain the multifunctional viscose. An experimental result shows that compared with viscose which is not added with nano-silver-loaded graphene, the multifunctional viscose has the advantages that the far infrared temperature increase performance is increased by not less than 100%, the ultraviolet protecting coefficient is increased by not less than 70%, and the antibacterial activity reaches 99.9% and is increased by not less than 100%.

An artificial polypeptide fiber of the present invention is an artificial fiber containing a polypeptide as a main component, and has a stress of 350 MPa or more and a toughness of 138 MJ/m³ or more. A method for producing an artificial polypeptide fiber of the present invention is a method for producing the artificial polypeptide fiber obtained by spinning a spinning solution (6) containing a polypeptide derived from natural spider silk proteins and performing drawing of at least two stages. The drawing of at least two stages includes a first-stage drawing (3) in wet heat and a second-stage drawing (4) in dry heat. Thereby, the present invention provides high-toughness artificial polypeptide fibers having favorable stress and rupture elongation, and a method for producing the same.

An apparatus for making electrspun fibers comprises a collector that may be submerged in a coagulation bath. The collector may be automatically movable between a first position and a second position, wherein at least a portion of the collected fibers are submerged in a coagulation bath in the first position and spaced apart from the coagulation bath in the second position. The collector may be a rotating collector. A process for making electrospun fibers comprises electrospinning a dispersion and collecting a plurality of electrospun fibers, followed by submerging the collected fibers in a coagulation bath.

The invention relates to a method for preparing a polyacrylonitrile carbon fiber precursor. The method comprises the following steps of: copolymerizing acrylonitrile and copolymerization components in multicomponent solution so as to form polymer spinning stock solution which has a relatively uniform and controllable molecular structure, performing demonomerization on the spinning stock solution,defoaming, filtering, and preparing the polyacrylonitrile carbon fiber precursor by a dry-jet wet-spinning process. The key technology of the method is that: a gas storage box is arranged on a dry wet spinning pack, the gas storage box and the liquid level of coagulating bath fluid form a dry-jet wet-spinning air layer into a confined space, and ammonia is persistently aerated into the space to carry out gas-liquid reaction with spinning solution trickle in the air layer. The polyacrylonitrile precursor prepared by the method has regular sections and few defects, the density is not less than 1.187g/cm<3>, the density after carbonization is not less than 1.79g/cm<3>, the strength is not less than 5.1GPa, and the modulus of elasticity is 280 to 300GPa.

An apparatus and method for forming liquid spinning solution into a solid formed product whereby the solution is passed through at least one tubular passage (17) having walls formed at least partly of semipermeable and/or porous material. The semipermeable and/or porous material allows parameters, such as the concentration of hydrogen ions, water, salts and low molecular weight, of the liquid spinning solution to be altered as the spinning solution passes through the tubular passage(s).

This invention pertains to a novel process for preparing fibers from poly(α(1→3) glucan). The fibers prepared according to the invention, have“cotton-like” properties, are useful in textile applications, and can be produced as continuous filaments on a year-round basis. The process comprises solution spinning from a novel solution of poly(α(1→3) glucan) in a mixture of water and N-methylmorpholine-N-oxide followed by coagulation in a liquid coagulant that comprises a liquid that is not water.

The invention discloses a method for preparing graphene functionalized alginate fibers. The method comprises the following steps: firstly adding a defined amount of graphene to a sodium alginate solution to obtain a graphene/alginate spinning solution; or aminating the defined amount of graphene and then ensuring the aminated graphene to covalently bind with sodium alginate through a chemical reaction to obtain a graphene-alginate spinning solution; then ensuring the graphene/alginate spinning solution or the graphene-alginate spinning solution to respectively undergo a coagulation bath to obtain graphene/alginate as-spun fibers or graphene-alginate as-spun fibers; and then drawing, setting and oiling the graphene/alginate as-spun fibers or graphene-alginate as-spun fibers after ensuring the graphene/alginate as-spun fibers or graphene-alginate as-spun fibers to undergo a preheating bath and a drawing bath respectively to obtain graphene/alginate functionalized fibers or graphene-alginate functionalized fibers which are called graphene functionalized alginate fibers. The prepared graphene functionalized alginate fibers integrate the excellent performances of the graphene and the sodium alginate and have the excellent performances such as high tensile strength, good biocompatibility, antistatic performance, light weight, high elasticity, antibacterial performance and the like.

The invention discloses a high-humidity modulus viscose fiber with dry strength of 3.5-6.0cN/dtex, wet elastic modulus of 0.35-0.60cN/dtex and wet strength of 2.0-4.5cN/dtex, and prepared of cellulose pulp with degree of polymerization of 500-1200 and alpha-cellulose content >=95% by the steps of dip-basifying, squeezing, ageing, yellowing, dissolving, wet spinning moulding, drafting, etc. And it has features of higher intensity and wet modulus, better loop strength performance, and lower brittleness; and the fabrics made by it has features of high intensity, multiple deformation resistance, alkali resistance, etc.

The present invention discloses a method for preparing hemp viscose fiber by using hemp plant and hemp visose fiber prepared by adopting said method. Said method includes the following steps: preparing raw material, digesting, washing material, pulping, removing sand, bleaching, water-washing, fiber-making, impregnating, pressing, pulverizing, aging, xanthating, dissolving, mixing, filtering, defoaming, spinning, drawing, cutting and making after-treatment.

The invention relates to water-soluble polymer/graphene composite fiber as well as a preparation method and application thereof. The cross section of the fiber is special-shaped, the surface of the fiber is of an orientated micro-fiber-shaped structure, the strength of the fiber is greater than 100 MPa, the elongation at break is greater than 2%, and the conductivity of the fiber is greater than 0.1 S/cm. The preparation method comprises the following steps: preparing a composite spinning liquid, extruding into a coagulating bath for curing, drafting, leading out of the coagulating bath, drying, and coiling, thereby obtaining the water-soluble polymer/graphene composite fiber; and finally reducing by using a chemical or physical method, thereby obtaining the water-soluble polymer/graphene composite fiber. The cross section of the composite fiber provided by the invention is of a special-shaped structure, the surface of the fiber is of a rich groove micro structure, the strength and the toughness of the fiber are greatly improved when being compared with those of pure graphene fiber, and good conductivity is still maintained, so that the water-soluble polymer/graphene composite fiber has a wide application prospect in the fields such as anti-electrostatic and conductive fabrics, electromagnetic wave absorption and shielding fabrics, energy storage devices, sensors and water treatment.

The invention discloses a biomimetic preparation method of a high-strength regenerated silk protein fiber. The method takes high crystallization degree, high strength, high modulus nano cellulose whiskers with a large length-diameter ratio to simulate the beta-fold microcrystal in the natural silk fiber, then mixes the nano cellulose whiskers with a regenerated silk fibroin solution, and finally prepares the high-strength regenerated silk protein fiber through a wet spinning method. The characteristic that a large amount of hydroxyl groups in the molecular chains of the rigid nano cellulose whiskers can form intermolecular hydrogen bonds with polar groups such as carboxyl groups, amino groups, and the like, in the molecular chains of silk protein is utilized to achieve the structural bionics of the regenerated silk protein fiber, and thus improves the mechanical properties of the regenerated silk protein fiber. The preparation method is simple, and does not pollute the environment. The mechanical properties of the obtained regenerated silk fiber are equal to or even better than those of natural silk, and the regenerated silk fiber has the similar micro-structure and configuration as the natural silk.