342results about "Dry spinning methods" patented technology

An object of the present invention is to provide a polyurethane urea elastic fiber whose physical properties do not change much over time and which retains its initial mechanical properties, and a method for obtaining this fiber by modifying the molecular chain and ends of the polyurethane urea polymer. Another object of the present invention is to provide a polyurethane urea elastic fiber whose use can improve inventory management and fiber processing condition management, and which can be used to obtain a fabric with stable physical properties and qualities, and to provide a method for producing this fiber. The present invention is a polyurethane urea elastic fiber comprising: polyurethane urea polymer A having a molecular chain using a polymer diol, a diisocyanate, and an organic amine as starting materials, and having a primary or secondary amino group on at least one end; and polyurethane urea polymer B using a polymer diol, a diisocyanate, an organic amine, and an organic carboxylic acid as starting materials, and containing an amide bond, wherein the polyurethane urea elastic fiber contains primary or secondary amino end groups in the range of 0.1 meq or more and 20 meq or less per kilogram of polyurethane urea elastic fiber.

The invention relates to a high-orientation polyimide fiber based on liquid crystal spinning and a preparation method of the high-orientation polyimide fiber. Rigid anhydride is used as a raw material to prepare para-diacid diester, and the para-diacid diester and rigid diamine are polymerized to prepare a full-para polyamic acid ester solution with lyotropic liquid crystal characteristics; and then adding an organic base catalyst to prepare a spinning solution, and carrying out high-temperature dry spinning, catalytic cyclization and high-temperature heat treatment to prepare the high-orientation polyimide fiber. According to the invention, an organic base catalyst is introduced into a spinning solution with lyotropic liquid crystal characteristics, and the high orientation of a liquid crystal domain along a fiber axis is realized by virtue of the shearing and fluid stretching effects of spinneret orifices; then, on the basis of high-temperature dry spinning and catalytic cyclization reaction, structural transformation from polyamide acid ester to polyimide is achieved while curing forming of the fiber is promoted, locking of an oriented structure and densification of the interior of the fiber are achieved, and therefore the stability and uniformity of the fiber are guaranteed; the method has great application potential in the field of extreme special environments such as aerospace.

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.

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

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

The utility model discloses a carbon fiber spinning assembly, which relates to the technical field of carbon fiber spinning and comprises a liquid supply module, a spinning module is mounted at the bottom of the liquid supply module, and a first fixing plate, a second fixing plate and a heating tank are sequentially mounted on the outer side of the liquid supply module from top to bottom. The multiple heating grooves are distributed in the area, located between the first fixing plate and the second fixing plate, of the outer side of the liquid supply module at equal intervals. And the heating assembly is internally provided with a plurality of heating units, the heating assembly is arranged on the outer side of the liquid supply module in a sleeving mode when used, and the heating units are embedded into the heating grooves correspondingly. The protection assembly is arranged between the liquid supply module and the coagulating bath tank, the protection assembly is formed by connecting the shielding section and the phase change section, the rotating plate in the phase change section is connected with the base plate through the universal pipes, and after the base plate is connected with the coagulating bath tank, by changing the shapes of the universal pipes, the liquid supply module is connected with the coagulating bath tank through the universal pipes. And the two ends of the first assembling plate can be kept in a parallel state.

This invention discloses a dry spinning tunnel and spinning method for large-tow polyimide fibers. The spinning tunnel includes a tunnel body, an air inlet pipe, two first perforated plates, two second perforated plates, and two annular spinnerets. The tunnel body is divided into an upper tunnel, a middle tunnel, and a lower tunnel from top to bottom, which are connected sequentially. The top of the upper tunnel and the bottom of the lower tunnel are both closed. The bottom of the lower tunnel has a filament outlet. The polyimide solution is ejected from the annular spinneret located at the top of the upper tunnel to form a liquid stream. Hot air from the air inlet pipe is blown evenly onto the liquid stream through the first perforated plates. The heating and insulation layers of the upper, middle, and lower tunnels can be adjusted to the corresponding temperatures according to process requirements, which allows the solvent in the large-tow liquid stream to evaporate in time and the filaments to solidify rapidly, thereby reducing filament tangling and achieving spinnability and stability of the large-tow fibers. The production of large tows of polyimide fibers produced by dry spinning of the present invention can be increased by at least 15 times.

A precursor fiber of a lignin-based carbon fiber is described, said precursor fiber having a content of a water-soluble lignin salt (A). A particular feature of these precursor fibers is that a water-soluble polyvinyl pyrrolidone or polyvinyl pyrrolidone derivative (B) is included therein. Advantageous methods for the preparation of these precursor fibers and their advantageous use for the preparation of carbon fibers by carbonization and optionally subsequent graphitization are also described.

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.

A preparation method of an aerogel fiber and use are provided. The preparation method includes: mixing a solvent and a polymer material to form a spinning solution; driving the spinning solution with a high-speed airflow by using a blow spinning technology to form a jet flow, and forming a gel fiber through sol-gel transition; and performing solvent replacement on the gel fiber and then performing drying treatment to prepare the aerogel fiber. The method for preparing the aerogel fiber through blow spinning has no high requirements on a gelation process of an aerogel material, and can achieve the preparation of the aerogel fiber by using this method after the spinning solution meeting rheological conditions is obtained, thereby avoiding the influence of the inadequate gelation process on fiber properties while promoting the production efficiency of the aerogel fiber and greatly simplifying procedures.

There is provided a system for creating a fibre, the system comprising, a first tube having a first tube outlet for dispensing a first liquid composition at a first dispensing rate; a second tube having a second tube outlet for dispensing a second liquid composition at a second dispensing rate; and a rotatable collector for applying a drawing force to draw and collect the fibre, said rotatable collector being configured to rotate about its longitudinal axis that is aligned substantially parallel to a horizontal plane; wherein the first tube is positioned in proximity with respect to the second tube to allow the first liquid composition from the first tube outlet and the second liquid composition from the second tube outlet to form an interfacial polyelectrolyte complex where a fibre is to be drawn therefrom.

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.

One aspect of the present disclosure provides a polymer compound production method comprising heating to cause a reaction between, in dimethyl sulfoxide in the presence of a base and a reducing agent, a polypeptide having at least one mercapto group, and at least one compound that has two structures represented by general formula (1) and that is selected from the group consisting of polyethers, polyesters, and polycarbonates. [In general formula (1), M represents any one of H, Na, K, NHEt3, or NHEtiPr2.]

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