273results about "Dry spinning methods" patented technology

The present invention relates to the field of the preparation of polyurethane elastic fibers, and relates to a preparation method for a bio-based polyurethane elastic fiber, comprising: preparing polyether polyol from sucrose, glycerol, dimethylamine and propylene oxide; adding a solvent, i.e., N,N-dimethylacetamide, and polyether polyol and polyisocyanate into a reaction tank, and adding p-Toluenesulfonyl semicarbazide and aluminum methylenebis(2,4-di-tert-butylphenoxy) phosphate to prepare a spinning solution; and subjecting the spinning solution to spinning and oil application by means of dry spinning technology to obtain the bio-based polyurethane elastic fiber. The present invention ensures that the properties of polyurethane elastic fibers do not deteriorate or are partially enhanced, while the cost and performance advantages are achieved.

The invention provides a dyeable high-temperature-resistant modified meta-position aramid fiber and a preparation method thereof. The modified meta-aramid fiber is mainly prepared from a spinning solution prepared from m-phenylenediamine, methyl 3, 5-diaminobenzoate, 3, 3 '-diaminodiphenyl sulfone and an isophthaloyl dichloride copolymer through dry spinning, and the dye uptake of a disperse dye is not lower than 85%; the thermal decomposition temperature is not less than 400 DEG C. The preparation method comprises the following steps. S1, fully continuous polymerization; s2, continuously neutralizing and conveying; s3, direct spinning; and S4, fiber forming and post-treatment. The method has the advantages that (1) the quality difference between batches in the traditional intermittent method is eliminated, and the uniformity and stability of the product performance are realized; and the preparation process is compact, the production efficiency is high and the energy consumption is low. And (2) the dyeing performance of the prepared fiber is obviously improved, the inherent high-temperature-resistant characteristic of the aramid fiber is maintained, and the mechanical property is excellent. And (3) the application range of the meta-position aramid fiber is expanded.

The invention relates to an intelligent temperature-regulating radiation refrigeration fiber as well as a preparation method and application thereof, i.e., based on the difference of emission performance of polyurethane in a mid-infrared band (8-13 microns) under different temperature conditions, the intelligent temperature-regulating radiation refrigeration fiber is prepared through synthesis of room-temperature reversible solid-solid phase change polyurethane, surface grafting dispersion modification of nanoparticles, polyurethane / nanoparticle dry spinning processing and the like. The invention discloses a method for preparing fibers and textiles with high and medium infrared band emissivity (relatively strong radiation refrigeration effect) under a high-temperature condition and low and medium infrared band emissivity (relatively weak radiation refrigeration effect) under a low-temperature condition. According to the method, the radiation refrigeration effect of the textile can be intelligently regulated and controlled based on the phase state structure change of the fiber material, and then the thermal comfort requirement of clothes under the high-temperature and low-temperature conditions is met. In addition, the method is simple in process and remarkable in effect, and overcomes the defects in the prior art.

The invention relates to a chemically modified high-strength high-temperature-resistant polyurethane fiber and a preparation method thereof.The preparation method comprises the following steps that 1, oligomer mixed polyol and diisocyanate are subjected to a full prepolymerization reaction, a solvent is added for full dissolution, and a-NCO-terminated prepolymer polyurethane formate solution is obtained; 2) adding hydroxyalkyl silane and a catalyst into the prepared prepolymer, and fully reacting to obtain a modified prepolymer; (3) carrying out chain extension reaction and chain termination reaction on the prepared modified prepolymer to obtain a polyurethane urea solution; (4) adding an antioxidant, an ultraviolet light absorber, an anti-yellowing agent, a delustering agent and a lubricating and releasing agent into the polyurethane urea solution to prepare a polyurethane spinning solution; and (5) preparing the high-strength high-temperature-resistant polyurethane from the prepared polyurethane spinning solution by virtue of a dry spinning system. According to the invention, a polyurethane molecular chain is subjected to functional chemical modification, so that the product has the characteristics of high temperature resistance and high strength.

The invention discloses a multi-section gradient heating and airflow optimizing structure of a dry spinning channel. Comprising a vertically-arranged channel body, a flow guide system arranged on the inner wall of the channel body, a flow stabilizing device arranged at an air inlet of the channel body, an air collecting hood arranged at the top of the channel body and a spinning nozzle installed below the air collecting hood. The channel main body is sequentially provided with a preheating section, a main volatilization section and a shaping section along the spinning direction, the inner walls of the preheating section, the main volatilization section and the shaping section are respectively provided with a heating plate which can be independently controlled, and the air inlets comprise air inlets which are respectively formed in the lower side parts of all sections of the channel main body. The multi-section gradient heating and airflow optimizing structure of the dry spinning channel can effectively solve the problem that an existing dry spinning channel is poor in spinning efficiency and product quality.

To provide an electrospinning solution that can reduce environmental burden and enables stable and favorable electrospinning of fibers with a low irritating odor.SOLUTION: An electrospinning solution used for electrospinning comprises ethyl cellulose, ethanol, and water, wherein the content of the ethyl cellulose relative to the total mass of the solution is 4 mass% or more, the ratio of the content of the ethanol and the water relative to the total mass of the solution (water / ethanol) is more than 0.1 and less than 0.55, and the content of acetic acid relative to the total mass of the solution is 1 mass% or less.SELECTED DRAWING: None

The present invention discloses an aerogel fiber having a specific cross-sectional morphology and a method and device for producing the same. The cross-sectional two-dimensional nanosheet arrangement of the aerogel fiber can be adjusted, and the adjustment method is as follows. At the same time as wet spinning, a rotating flow field device is added before the spinning solution fluid is ejected, and the rotating flow field causes the two-dimensional nanosheet to form a specific sheet layer arrangement in the cross-sectional direction of the gel fiber due to the rotational shear action, and the gel fiber having a specific cross-sectional structure is obtained by preparing graphene oxide aerogel fiber having a specific morphological structure (concentric circles and spiral lines) under freeze-drying conditions. The present invention further performs drying and densification, stretching, and reduction on such a hydrogel fiber with a concentric structure to obtain graphene fiber with high elasticity and high thermal conductivity, and improves its thermal conductivity and elasticity compared to conventional graphene fiber.

The application discloses a method for preparing silicon carbide ceramic fibers by combining sol-gel and dry spinning. The method comprises the following steps: 1) after preparing a second silicon-based sol, a spinning aid is added to prepare a spinnable silicon-based sol; 2) the spinnable silicon-based sol is prepared into fiber filaments by using a dry spinning process; 3) the fiber filaments are cracked into silicon-carbon-oxygen fibers; and 4) the silicon-carbon-oxygen fibers are sintered into silicon carbide ceramic fibers. The method is different from a mainstream polycarbosilane precursor method for preparing silicon carbide ceramic fibers, does not need a non-melting treatment process, has the advantages of adjustable composition, low raw material cost and simple process and the like, and has important significance for low-cost preparation of silicon carbide ceramic fibers.

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.

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.

The present invention provides a mask comprising a mask body that covers the face of a wearer and a wearing string attached to both sides of the mask body, the mask body including a filter member consisting of a support layer having a mesh structure and a filter coating layer formed on the outer surface of the support layer and filtering pollutants, the filter coating layer being made of a web of fine fibers electrospun onto the support layer.

This invention provides a method for producing nanofibers that does not use highly toxic crosslinking agents and has a low environmental impact. Furthermore, it also provides a method for producing food freshness sensors and drug-supported nanofibers based on the nanofiber production method of this invention. [Solution] A method for producing nanofibers, comprising: a spinning solution preparation step of preparing a spinning solution containing a citrus-derived material obtained from citrus fruits and a water-soluble polymer that can be made into fibers; a nanofiber formation step of forming nanofibers from the spinning solution by electrospinning; and a crosslinking step of crosslinking the nanofibers.

A process for preparing a carbon fiber precursor wherein the precursor is selected from a series of solid PAN (polyacrylonitrile) fibers, wherein each member of the series contains about 2 weight % to about 8 weight % completely neutralized itaconic acid.

To provide an electrostretching machine with improved material uniformity. [Solution] The present invention relates to an electrostretching machine with improved material uniformity, in which the shape of the electric field generated between the emitter and the collector is changed stably or variably over time, thereby achieving a more uniform deposition of fiber-particles. To do this, the machine comprises a steering electrode (6) positioned at the end of an injector (1), the steering electrode (6) being connected to a power module (5) that applies a potential difference to the steering electrode to exert a repulsive or attractive force on the fiber-particles (4), and a collector (3) comprising conductive material regions (8) positioned on the surface of an insulating material (7) that are electrically insulated from each other, and a voltage which can have a continuous or alternating amplitude and / or phase is applied to the conductive material regions (8).

The application is a preparation method of polylactic acid-based polyurethane elastic fiber, comprising the following steps: step 1, reacting polylactic acid polyol, isocyanate compound and catalyst to obtain isocyanate group terminated prepolymer; step 2, fully reacting the prepolymer, chain extender and capping agent in the presence of a solvent in a reactor to obtain a polyurethane solution; step 3, using the polyurethane solution as a spinning solution to obtain polylactic acid-based polyurethane elastic fiber by dry spinning. The added nucleating agent and heat treatment technology are used to form a more perfect crystalline structure in the fiber, and the crystals act as physical crosslinking points, so that the fiber has higher modulus and breaking strength. The polylactic acid polyol with biodegradability is used to replace the traditional polymer polyol to synthesize polyurethane fiber, so that the prepared spandex is degradable, and the problems of difficult degradation and environmental pollution of waste spandex are effectively solved.

The invention relates to the technical field of wool and cashmere blending, in particular to a wool and cashmere blended knitting yarn manufacturing process and device. The device further comprises a blending mechanism, a carding mechanism and a silk twisting mechanism. The carding mechanism, the silk twisting mechanism and the collecting mechanism are all installed on the blending mechanism. The blending mechanism is used for blending wool and cashmere, the carding mechanism is used for carding the cashmere, the yarn twisting mechanism is used for twisting the cashmere, and the collecting mechanism is used for collecting blended yarns; keratin liquid made of wool is poured into a mixing mechanism, silk spraying is conducted on the keratin liquid, meanwhile, cashmere is mixed into keratin liquid silk, then the keratin liquid silk is solidified, the cashmere and the keratin liquid are mixed, then the cashmere connected together is separated through a carding mechanism, the cashmere is wound on the keratin liquid silk through a silk twisting mechanism, and the cashmere is spun into the keratin liquid silk. And then the blending silk threads are collected through the collecting mechanism, so that the practicability of the equipment is improved.

To provide: a polyurethane urea elastic fiber and a method of manufacturing the same by modifying structure and a terminal of a molecular chain of polyurethane, where temporal stability of yarn physical properties and spinning stability are both excellent with existing stretchability not impaired; and also the polyurethane urea elastic fiber and the method of manufacturing the same by using a polyurethane urea elastic fiber obtained thereby, where stock management and processing condition management of the fiber are made easy and a cloth having stable fabric physical properties or fabric quality can be obtained.SOLUTION: A polyurethane urea elastic fiber includes: a polyurethane urea copolymer A including a molecular chain in which polymer diol, diisocyanate, and organic amin are starting materials and at least one of terminals is a primary or a secondary amino group; and a polyurethane urea copolymer B including a molecular chain in which polymer diol, diisocyanate, organic amin, and organic carboxylic acid are starting materials, the molecular chain including an amino bond. The primary or secondary amino group at the terminal is contained in a range of 0.1 meq or more and 20 meq or less per 1 kg of the polyurethane urea elastic fiber.SELECTED DRAWING: None

The present invention refers to a method and device for the preparation of microfibres and nanofibres based on hyaluronic acid and / or a water-soluble metal or non-metal salt thereof or a mixture of salts and / or a derivative of hyaluronic acid by method of dry spinning, and two-dimensional or three-dimensional fibrous materials from this microfibres and nanofibres. The resulting 2D or 3D materials can be for example in the shape of layer or cotton wool. Furthermore, the present invention refers to a device for performing this method, that contains an extrusion part containing a pass-through channel, that has an inlet opening for feeding the spinning solution and a dispensing opening for dispensing the spinning solution and furthermore the device contains an air nozzle, the air outlet opening of which is arranged to direct the exiting air into the area surrounding the dispensing opening of the extrusion part parallel to the axis of the dispensing opening of the extrusion part.

According to the present disclosure there is provided a method of depositing a fibre onto a freestanding object using a fibre deposition apparatus. The fibre deposition apparatus comprises a dispenser and a moveable arm defining a deposition zone. The method comprises: positioning the fibre deposition apparatus such that the freestanding object is located within the deposition zone, forming a droplet of a fibre-forming liquid composition at an outlet of the dispenser, moving the arm from a first position in contact with the droplet to a second position away from the first position so as to draw the droplet into a drawn fibre, and depositing the drawn fibre onto the freestanding object as the arm moves from the first position to the second position. According to a further aspect of the present disclosure there is provided a fibre deposition apparatus for depositing fibres onto a freestanding object. According to a further aspect of the present disclosure there is provided a liquid composition for forming a drawn fibre. The liquid composition comprises a fibre-forming polymer; a solvent; and a functional component.

To provide a spinning head capable of properly preventing persistence of air in a housing cavity even when a channel is tilted to a horizontal plane in a state that an ejection port is positioned in an upper side in its vertical direction to a connecting part to a housing cavity.SOLUTION: In this embodiment, a spinning head is assembled with a head body and a nozzle, and in an inside of the head body, a housing cavity capable of housing a raw material liquid is formed. The nozzle projects from an outer peripheral surface of the head body, and an ejection port capable of ejecting the raw material liquid is formed on a projection end of the nozzle. A channel connected to the housing cavity is extended to the ejection port through an inside of the nozzle. The ejection port is positioned on an upper side in its vertical direction to a connecting part to the housing cavity, and at least a part of the channel is tilted to the horizontal plane. The top edge of the connecting part of the channel to the housing cavity is positioned on the same height or on an upper side in its vertical direction to the top edge of the housing cavity.SELECTED DRAWING: Figure 3

Expanded polytetrafluoroethylene (ePTFE) monofilaments with superior knot pull tensile strength are described herein, which can be used as sutures and in medical devices such as for tethers and anchors for cardiac repair. The properties of these monofilaments balance the need for an inert, soft, lubricious and porous material with sufficient tensile properties for high strength applications.

The present invention relates to a patch product. [Solution] The patch product is composed of a membrane substrate based on a natural polymer suitable for absorption by the skin and at least one active ingredient, and can be packaged in a package consisting of a support for placing the patch product and a covering layer for protecting the patch product.

The present invention relates to a method and device for the production of microfibres or nanofibres based on hyaluronic acid and / or a water-soluble metal or non-metal salt thereof or a mixture of salts and / or a derivative of hyaluronic acid by the method of dry spinning and / or solution blow spinning, and two-dimensional or three-dimensional fibrous materials from said microfibres and nanofibres. The resulting 2D or 3D materials can be for example in the form of a layer or cotton wool. Furthermore, the present invention relates to a device for carrying out the method, that contains an extrusion piece containing a pass-through channel, that has an inlet opening for feeding the spinning solution and a dispensing opening for dispensing the spinning solution and furthermore the device contains an air nozzle, the air outlet opening of which is arranged to direct the exiting air into the area surrounding the dispensing opening of the extrusion piece parallel to the axis of the dispensing opening of the extrusion piece.

To suppress filming of ultra fine fibers in a collection member.SOLUTION: A nozzle head 10 includes a spinning hole 21 open to an outer peripheral surface, a cylindrical head main body 11 having feeding passages 14, 15 for feeding spinning liquid L including a solvent to the spinning hole 21, and a spinning electrode 22 for charging the spinning liquid L. By an electric potential difference between the spinning electrode 22 and a collector electrode 33 disposed on the outside of the nozzle head 10, the spinning liquid L is ejected from the spinning hole 21 and collected in a collection member 35 in a form of an ultra fine fiber. The nozzle head 10 is assembled with an air discharge port 29 that discharges air A so as to be in contact with a jet flow J of the spinning liquid L from the spinning hole 21 to the collection member 35.SELECTED DRAWING: Figure 5

Stretch nonwoven laminates containing high recovery polyurethane elastic fibers, articles of manufacture comprising these stretch nonwoven laminates, and methods of making the stretch laminates and articles of manufacture are provided.

A purpose of the present invention is to provide a crosslinked-gelatin nanofiber filter which has satisfactory flexibility, is less apt to break when in use, and can have controlled solubility under specific temperature conditions. The crosslinked-gelatin nanofiber filter comprises gelatin, a thickening polysaccharide, and a cyclic sugar, does not dissolve in 20°C pure water, has a dissolution time in 25°C pure water of 60 minutes or shorter, and has an average fiber diameter of 300-600 nm.

The application provides a kind of bio-based spandex elastic fiber and its preparation method, the bio-based spandex is introduced into spandex molecular chain by bio-based polyether polyol, and the bio-based polyether polyol contains bio-based 1,3-propanediol unit structure.The preparation method is that the bio-based spandex is obtained by including bio-based polyurethane prepolymer, mixed amine reaction to obtain the raw material containing polyurethane-urea polymer, and the raw material is used as the spinning solution to obtain by dry spinning.The performance of the spandex product is close to the petrochemical-based spandex product, which can perfectly replace the petrochemical-based spandex product and better promote the transformation and upgrading of the product.The technical problem that the difference in performance between bio-based raw materials and petrochemical-based materials leads to insufficient reaction or instability is solved, the conventional petroleum-based spandex production equipment can be directly used, and industrial production is realized.

The present invention provides a fiberization apparatus and a dry film formation apparatus that avoid damage and aggregation of material particles and improve the uniformity of particle size after pre-fiberization. [Solution] The fiberization apparatus includes a fiberization mechanism 100, a feeding mechanism 200, and a cutting and sorting mechanism 300. The fiberization mechanism includes two fiberization rollers 101 arranged opposite each other, with a supply gap 102 formed between the two fiberization rollers, and the supply gap includes a supply end and a discharge end. The feeding mechanism is located above the supply end. The cutting and sorting mechanism is located below the discharge end and includes a hopper 301, a crushing member 302, and a screen 303, the screen being located below the crushing member. A constant pressing and shearing force is applied to the material fed into the supply gap via the opposing fiberization rollers, so that the material is fiberized without being subjected to strong impact, the material can be effectively fiberized, and damage to the material particles due to strong impact can be avoided.

The application provides a shaped cross-section carbon fiber precursor, a shaped cross-section carbon fiber and a preparation method, and relates to the technical field of carbon fibers. The preparation method of the shaped cross-section carbon fiber precursor comprises the following steps: extruding a spinning dope through a spinneret with a shaped hole according to a preset spinning rate to form a dope fine stream; making the dope fine stream pass through an air layer with a preset height and then enter a coagulation bath to be coagulated and formed at a first preset temperature to obtain a nascent fiber; and performing post-treatment on the nascent fiber to obtain the shaped cross-section carbon fiber precursor. The shaped degree of the spinneret with the shaped hole is 0.2-0.8. The preset spinning rate is 15.00-25.00 m / min. The preset height is 1.5-4.5 mm. The concentration of the coagulation bath is 30-70 wt%. The first preset temperature is 5-55 DEG C. The shaped cross-section carbon fiber prepared from the polyacrylonitrile-based precursor according to the application has the characteristics of high specific surface area, high compactness and low skin-core ratio.