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1287 results about "Fiber spinning" patented technology
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Liquid crystalline thermosets from ester, ester-imide, and ester-amide oligomers
InactiveUS6939940B2Low viscosityLow dielectric constantLiquid crystal compositionsLiquid crystallineEnd-group
Main chain thermotropic liquid crystal esters, ester-imides, and ester-amides were prepared from AA, BB, and AB type monomeric materials and were end-capped with phenylacetylene, phenylmaleimide, or nadimide reactive end-groups. The resulting reactive end-capped liquid crystal oligomers exhibit a variety of improved and preferred physical properties. The end-capped liquid crystal oligomers are thermotropic and have, preferably, molecular weights in the range of approximately 1000-15,000 grams per mole. The end-capped liquid crystal oligomers have broad liquid crystalline melting ranges and exhibit high melt stability and very low melt viscosities at accessible temperatures. The end-capped liquid crystal oligomers are stable for up to an hour in the melt phase. These properties make the end-capped liquid crystal oligomers highly processable by a variety of melt process shape forming and blending techniques including film extrusion, fiber spinning, reactive injection molding (RIM), resin transfer molding (RTM), resin film injection (RFI), powder molding, pultrusion, injection molding, blow molding, plasma spraying and thermo-forming. Once processed and shaped, the end-capped liquid crystal oligomers were heated to further polymerize and form liquid crystalline thermosets (LCT). The fully cured products are rubbers above their glass transition temperatures. The resulting thermosets display many properties that are superior to their non-end-capped high molecular weight analogs.
Owner:NASA
Method of placing a tubular membrane on a structural frame
The present invention relates to a medical device, and more particularly to a method of forming a tubular membrane on a radially expandable structural frame. In one aspect, a structural frame is placed over a spinning mandrel and a fiber is electro-statically spun over at least a portion of the structural frame forming a membrane. A transfer sheath may be used between the mandrel and structural frame to prevent the electrostatically spun fiber from adhering to the mandrel. In another aspect, a first membrane is spun over the mandrel before the structural frame is placed over the mandrel. In this aspect, at least a portion of the structural frame is sandwiched between the membranes. The membrane or membranes and structural frame form a fiber spun frame assembly. The fiber spun frame assembly may be coated with an elastic polymer. In addition, the membrane or membranes may go through some post processing to achieve desired characteristics or configurations.
Owner:CARDINAL HEALTH SWITZERLAND 515 GMBH
Modified Polylactic Acid Fibers
ActiveUS20120040582A1Improve responseMelt spinning methodsWoven fabricsChain scissionGlass transition
A method for forming biodegradable fibers is provided. The method includes blending polylactic acid with a polyepoxide modifier to form a thermoplastic composition, extruding the thermoplastic composition through a die, and thereafter passing the extruded composition through a die to form a fiber. Without intending to be limited by theory, it is believed that the polyepoxide modifier reacts with the polylactic acid and results in branching of its polymer backbone, thereby improving its melt strength and stability during fiber spinning without significantly reducing glass transition temperature. The reaction-induced branching can also increase molecular weight, which may lead to improved fiber ductility and the ability to better dissipate energy when subjected to an elongation force. To minimize premature reaction, the polylactic acid and polyepoxide modifier are first blended together at a relatively low temperature(s). Nevertheless, a relatively high shear rate may be employed during blending to induce chain scission of the polylactic acid backbone, thereby making more hydroxyl and / or carboxyl groups available for subsequent reaction with the polyepoxide modifier. Once blended, the temperature(s) employed during extrusion of the blended composition can be selected to both melt the composition and initiate a reaction of the polyepoxide modifier with hydroxyl and / or carboxyl groups of the polylactic acid. Through selective control over this method, the present inventors have discovered that the resulting fibers may exhibit good mechanical properties, both during and after melt spinning.
Owner:KIMBERLY-CLARK WORLDWIDE INC
Arrays of long carbon nanotubes for fiber spinning
InactiveUS20070116631A1Material nanotechnologyPhysical/chemical process catalystsHydrogenWater vapor
An array of long carbon nanotubes (i.e. an array where the average length of the nanotubes is greater than 0.5 millimeters) is prepared by exposing a supported catalyst at elevated temperature to a gas mixture of hydrocarbon, inert gas, and a relatively low percentage of hydrogen. Addition of water vapor to the gas mixture may result in an increase in the length of the nanotubes, an increase the rate of growth, and a decrease in contamination of the array by amorphous carbon. The temperature and growth time are also chosen to minimize the amount of amorphous carbon that forms on the array. Fibers spun from the array have a higher tensile strength compared to known CNT fibers.
Owner:RGT UNIV OF CALIFORNIA
Composite material comprising oriented carbon nanotubes in a carbon matrix and process for preparing same
Fiber spinning of two polymer compositions wherein one of the compositions contains carbon nanotubes produces structures such as fibers, ribbons, yarns and films of carbon nanotubes. The polymers are removed and stabilization of the carbon nanotube material is achieved by post-spinning processes. The advances disclosed herein enable the carbon nanotube composites to be used in actuators, supercapacitors, friction materials and in devices for electrical energy harvesting.
Owner:HONEYWELL INT INC
Composite material comprising oriented carbon nanotubes in a carbon matrix and process for preparing same
Fiber spinning of two polymer compositions wherein one of the compositions contains carbon nanotubes produces structures such as fibers, ribbons, yarns and films of carbon nanotubes. The polymers are removed and stabilization of the carbon nanotube material is achieved by post-spinning processes. The advances disclosed herein enable the carbon nanotube composites to be used in actuators, supercapacitors, friction materials and in devices for electrical energy harvesting.
Owner:HONEYWELL INT INC
Method of forming a tubular membrane on a structural frame
The present invention relates to a medical device and method of forming the medical device. In particular, the present invention relates to a medical device having a tubular membrane structure over a radially expandable structural frame, and to a method of forming the tubular membrane on the radially expandable structural frame. In one aspect, a structural frame is placed over a spinning mandrel and a fiber is electro-statically spun over at least a portion of the structural frame forming a membrane. A transfer sheath may be used between the mandrel and structural frame to prevent the electro-statically spun fiber from adhering to the mandrel. In another aspect, a first membrane is spun over the mandrel before the structural frame is placed over the mandrel. In this aspect, at least a portion of the structural frame is sandwiched between the membranes. The membrane or membranes and structural frame form a fiber spun frame assembly. The fiber spun frame assembly may be coated with an elastic polymer. In addition, the membrane or membranes may go through some post processing to achieve desired characteristics or configurations.
Owner:CARDINAL HEALTH SWITZERLAND 515 GMBH
Orientation electro-spinning nanometer fiber spinning method and device thereof
InactiveCN103132194AHigh degree of axial orientationSuppress spinning instabilityDrafting machinesFilament/thread formingBobbinEngineering
The invention discloses an orientation electro-spinning nanometer fiber spinning method and a device thereof. A metal shower nozzle which exerts positive and negative high pressure is adopted to spin two strands of nanometer fibers with opposite charges, an electric field line of a spinning electric field, relative to a common spinning electric field, is straight, stability of spinning is effectively restrained, and the spinning nanometer fibers are straight. Two strands of the fibers surround the yarn tail and form a cone-shaped twisting trigonum on the upper portion of a metal twisting machine, and enable the nanometer fibers to be further oriented and twisted to form yarn through electric field force, tractive force of the yarn and acting force of the metal twisting force. The spinning nanometer fiber yarn is conducted heat shaping through a heat processing device under certain tensile force, degree of orientation of the nanometer fibers along the axial direction of the yarn, breaking force and yarn levelness are further improved, and the yarn after shaped is collected by a winding bobbin. The device can achieve the aim that orientation nanometer fiber yarn can be continuously prepared, is simple in device, convenient to operate, and good in resultant yarn continuity, yarn breaking strength and yarn levelness, and not only can spin pure nanometer fiber yarn, but also can spin nanometer fibers / filament core composite yarn. The orientation nanometer fiber spinning method and the device thereof have important application value in the fields, such as a biomedical field and a sensor field.
Owner:杨恩龙 +1
Jet yarn spinning device for electrostatic spun nano fiber and preparing method
InactiveCN102703998AIncrease productionReduce volatilitySpinnerette packsFilament/thread formingYarnNanofiber
The invention discloses a jet yarn spinning device for an electrostatic spun nano fiber, which includes a collecting device, wherein two thread jetting devices are arranged on the two sides of the collecting device and connected with a high-voltage electrostatic generator; a buncher is arranged below the collecting device; the two thread jetting devices are arranged between the collecting device and the buncher and symmetrically and oppositely arranged along the axis; a jet nozzle twister is arranged below the buncher; a delivery roller is arranged below the jet nozzle twister; a winding mechanism is arranged below the delivery roller; and the collecting device, the buncher, the jet nozzle twister and the delivery roller are arranged along the same axis from top to bottom. The electrostatic spun nano fiber spinning device integrates thread jetting, collecting, drawing, twisting and winding, and can continuously prepare the electrostatic spun nano fiber yarns. The nano fiber spinning method has simple process, high yarn yield, is suitable for multiple polymer yarn solutions, and realizes the continuous and scaled preparation of the nano fiber yarns.
Owner:ZHONGYUAN ENGINEERING COLLEGE
Carbon nanotube fiber spun from wetted ribbon
A fiber of carbon nanotubes was prepared by a wet-spinning method involving drawing carbon nanotubes away from a substantially aligned, supported array of carbon nanotubes to form a ribbon, wetting the ribbon with a liquid, and spinning a fiber from the wetted ribbon. The liquid can be a polymer solution and after forming the fiber, the polymer can be cured. The resulting fiber has a higher tensile strength and higher conductivity compared to dry-spun fibers and to wet-spun fibers prepared by other methods.
Owner:TRIAD NAT SECURITY LLC
Process for preparing composite hollow fiber membrane
A preparation of composite hollow fiber membrane adopts solution phase transfer hollow fiber spinning process, makes poly(ethylene terephthalate) or polysulfone, solvent and pore-forming agent into a base membrane spinning solution of composite hollow fiber membrane, makes polyvinylidene fluoride or other copolymers or mixture of same, solvent and pore-forming agent into composite layer spinning solution of composite hollow fiber membrane and simultaneously extrudes the said two spinning solution and core solution in the hole of the spinneret central pipe through the spinneret for outside condensation bath. The solvents and pore-forming agents in the two kinds of spinning solutions prepared in said step (1) and (2) enters condensation solution phase and the polymers, as the composite layer and the base membrane materials, precipitates into polymer hollow fiber membrane due to phase transfer, producing high-strength and high-flux hydrophilic composite hollow fiber membrane.
Owner:江苏美能膜材料科技有限公司
Manufacturing device and the method of preparing for the nanofibers via electro-blown spinning process
ActiveUS7618579B2Easily realizedElectric discharge heatingWood working apparatusThermoplasticNanofiber
The invention relates to a nanofiber web preparing apparatus and method via electro-blown spinning. The nanofiber web preparing method includes feeding a polymer solution, which is a polymer dissolved into a given solvent, toward a spinning nozzle, discharging the polymer solution via the spinning nozzle, which is charged with a high voltage, while injecting compressed air via the lower end of the spinning nozzle, and collecting fiber spun in the form of a web on a grounded suction collector under the spinning nozzle, in which both of thermoplastic and thermosetting resins are applicable, the solution does not need to be heated and electrical insulation is readily realized.
Owner:DUPONT SAFETY & CONSTR INC
Fiber charging apparatus
A fiber spinning apparatus for charging a polymer-containing liquid stream, having at least one electrically charged, point-electrode positioned adjacent the intended path of said liquid stream and creating an ion flow by corona discharge to impart electrical charge to the polymer-containing liquid stream.
Owner:DUPONT SAFETY & CONSTR INC
A kind of production method of superfine high-strength high-modulus viscose fiber
InactiveCN102296373AIncrease contact areaIncreasing the thicknessSpinnerette packsArtificial filaments from viscoseCellulosePolymer science
The invention discloses a production method of ultra-fine, high-strength and high-modulus viscose fibers. The cellulose xanthate polymer spinning viscose which is still in a viscous flow state is provided with viscose ejection holes and coagulation baths respectively. The composite spinneret of the spray hole is sprayed out, and is solidified and formed by a low-acid, high-zinc, low-salt and low-temperature coagulation bath, and then combined with bath stretching and air stretching, and drawn by nozzles with different ratios , inter-disk drafting and plasticizing drafting, and then post-treatment to obtain a fineness of 0.44~0.78dtex, dry strength ≥ 3.1cN / dtex, wet strength ≥ 2.1cN / dtex, wet modulus ≥ 0.5cN / dtex, whiteness ≥82.0% ultra-fine high-strength high-modulus viscose fiber. The invention realizes the effective coordination of the ultrafine denier fiber spinning forming process and drafting, and the normal implementation of the spinning process, and the produced ultrafine high-strength high-modulus viscose fiber has a uniform structure, and the fiber strength and modulus are 50% higher than conventional varieties. %above.
Owner:CHTC HELON
Method for producing terylene fibre with pearly lustre
InactiveCN101381903AImprove performanceAdd lessFilament/thread formingPigment addition to spinning solutionPolyesterLight extinction
The invention relates to a method for preparing polyester fibers with pearly luster. The method comprises the following steps: (1) pearlescent pigment agglomerate and full-dull PET fiber forming resin slice are blended according to the weight ratio of 5-20 to 80-95; and after drying, the water content is less than 100PPM, and the slice is delivered to a feeding port of an extruder and enters an screw extruder for heat fusing and compression; (2) the temperature is controlled to between 290 and 305 DEG C, fusant extruded out by the rotary screw rod enters a metering pump through a distributing pipe and a static mixer, delivered to a spinning component, filtered by a sea sand layer and pressed into a spinning plate to form fusant current which is cooed to form in a spinning cabinet, and the surface of a filament bundle is covered by a spinning finish; and 3. the spinning speed pre-extension is between 2, 500 and 3, 500m / min, the winding carry rate is between 5 and 15 percent for wind-forming, and the full-dull pearlescent polyester fiber POY is obtained. The manufacturing process is easily realized, and is convenient to improve the pearlescent fiber spinning effect and simultaneously provides the fibers with light extinction performance, and the pearlescent pigment has excellent performance and little feed rate.
Owner:DONGHUA UNIV
Functional viscose fiber containing Chinese medicinal component and its preparation method
InactiveCN1786300AKeep active ingredientsOvercome defectsArtificial filaments from viscoseAfter treatmentChinese drug
The invention discloses a traditional Chinese drug component containing functional viscose fiber and its manufacturing method. It is made up of traditional Chinese drug material, semi-finished products, finished products, part of dregs of decoction, and viscose fiber. Its components content is fiber: 85-99.9%, traditional Chinese drug: 0.1-15%. Its manufacturing method includes the following steps: dipping, mellowing, sulphidizing, dissolving, mixing, filtering, defoaming, ripening, spinning fore raw liquor mixing, traditional Chinese drug fiber spinning and drafting, and fiber after-treatment. Its traditional Chinese drug content can reach 10%. Thus the fiber has more effective health protection, sickness prevention, and auxiliary therapy. Thus it is fit for making underclothes, bedding, medical component, and so on.
Owner:张志伟
Method of forming a tubular membrane on a structural frame
Owner:CORDIS CORP
Dynamic demonomerization and defoaming method and device for carbon fiber spinning solution
ActiveCN101856570AContinuous quantitative feedingSingle and degassing continuous dynamicFoam dispersion/preventionCarbon fibersSolvent
The invention discloses a dynamic demonomerization and defoaming method and a dynamic demonomerization and defoaming device for carbon fiber spinning solution. An ultrasonic generator is arranged in the centre of a defoaming kettle; an air guide cylinder and a flow guide disk are arranged on a flow diversion and air guide cover; and the defoaming effect is improved to realize low-temperature high-vacuum demonomerization and defoaming of the spinning solution with different relative molecular masses and different charging rates by the processes of heating a demonomerization and defoaming device, continuous feeding, gravity demonomerization and defoaming, film stretch defoaming and ultrasound-assisted defoaming and controlling the defoaming temperature, the vacuum degree and the rotation speed of a demonomerization tower. The spinning solution obtained by the method has the residual monomer content of less than 0.1 percent, less than 5 small bubbles with diameter of less than 0.03mm and solvent loss of less than 5 percent during the demonomerization and defoaming. The method and the device can realize continuous dynamic demonomerization and defoaming at a low temperature under vacuum condition and has the characteristics of simple and practical process and good defoaming effect.
Owner:XIAN KANGBEN MATERIAL
Filtering material for mask and method for manufacturing filtering material
InactiveCN102872654AImprove breathabilityRetention rate can be adjustedFiltration separationProtective garmentElectrospinningMicrometer
The invention discloses a filtering material for a mask and a method for manufacturing the filtering material. The filtering material for the mask comprises polymeric nano-fibers and a supporting non-woven fabric. The method for manufacturing the filtering material includes spinning homogenous polymeric nano-fiber spinning solution or fusant on the supporting non-woven fabric by solution or fusion electrostatic spinning. The filtering material for the mask is excellent in breathability, and rejection to sodium chloride aerosol particles with the sizes of 0.3 micrometer can be higher than 90%. Besides, the method for manufacturing the filtering material for the mask is simple, cost is low, and the filtering material and the method are applicable to industrial production.
Owner:SHANGHAI JIAO TONG UNIV
Method for preparing super-high molecular weight polyacrylonitrile-base carbon fiber spinning primary fluid
InactiveCN101260172AStir wellImprove heat transfer performanceFibre chemical featuresPolymer scienceNitrogen
Owner:INST OF CHEM CHINESE ACAD OF SCI
Alumina-silica-based fiber, ceramic fiber, ceramic fiber complex, retaining seal material, production method thereof, and alumina fiber complex production method
InactiveUS20090072498A1High mechanical strengthHigh initial face pressureCombination devicesMaterial nanotechnologyInorganic saltsSilicon dioxide
A manufacturing method by which alumina-silica based fibers excellent in mechanical strength can be readily and securely obtained. The method obtains precursor fibers as a material by using an alumina-silica based fiber spinning stock solution for use in an inorganic salt method. Next, the precursor fibers are heated under an environment which makes it difficult to carry out an oxidizing reaction on the carbon component contained in the precursor fibers. Thus, the precursor fibers are sintered to obtain alumina-silica based fibers.
Owner:IBIDEN CO LTD
Feather protein fiber and method for preparing same
InactiveCN102733001AImprove wrinkle resistanceImprove toughnessConjugated cellulose/protein artificial filamentsCellulose/protein filament chemical after-treatmentPotassium silicateAqueous solution
The invention discloses a feather protein fiber and a method for preparing the same. The feather protein fiber comprises the following components: 5-40 parts by weight of feather protein and 60-95 parts by weight of chemical fiber. The method for preparing the feather protein fiber comprises the following steps: A, feather protein spinning solution preparing: dissolving feather in an alkaline aqueous solution comprising sodium silicate and potassium silicate with the total mass concentration of 20-35%, and filtering to obtain the feather protein spinning solution, wherein the mass ratio of the sodium silicate to the potassium silicate is 1:(0.5-1); B, blending the feather protein spinning solution and the chemical fiber spinning solution, and spinning; and C, subjecting the feather protein fiber trickle to coagulation-bath treatment, pickling, washing and drying to obtain the feather protein fiber. The method for preparing the feather protein fiber can effectively ensure that the feather protein and the chemical fiber are fully and uniformly blended to achieve the purpose of spinning.
Owner:成都天之蚕生物科技有限公司
Fire-resistant high-resiliency spandex fabric and method for making same
InactiveCN101113534AIncrease elasticityHigh temperature high elasticityMonocomponent polyurethanes artificial filamentFilament/thread formingYarnPolymer science
The invention discloses a urethane elastic fiber with high temperature resistance and high elasticity and a preparation method thereof, the materials of the urethane elastic fiber comprise: polyether diols, diisocyanate, butanol, amine admixture, anti-oxidant, reelability agent, ultraviolet absorber, yellowing resistant agent and dimethyl acetamide; the preparation method of the urethane elastic fiber is that: a prepolymer is obtained through prepolymerization reation, and macromolecule polymer is also obtained through continuous chain extension reactions, then spinning solution is formed by adding different auxiliary agents; finally winding and dry spinning through round spinning channel are performed to obtain a high temperature high elastic urethane fiber spinning can which has the advantages of high temperature resistance, high elasticity, excellent reelability, outstanding yarn evenness, etc, and the preparation method can realize the continuous process of chain extension reactions and addition of auxiliary agents with continuous and stable production process and high product evenness and can completely meet the requirements of all kinds of novel fabrics and high grade fabrics.
Owner:YANTAI TAYHO ADVANCED MATERIALS CO LTD
Polyamide and polyester sheath-core functional fiber and manufacturing method
InactiveCN101586269ARigidWith wear resistanceFilament/thread formingConjugated synthetic polymer artificial filamentsComposite constructionPolyamide
Owner:ZHEJIANG SCI-TECH UNIV
Animal protein fiber and preparing method thereof
InactiveCN1508303AImprove curl volumeIncreased curl volumeMonocomponent synthetic polymer artificial filamentAfter treatmentAnimal protein
The invention discloses an animal protein fiber and preparing method. The animal protein fiber is a copolymer of animal protein and C-C double-bonded monomer, the molecular weight 10,000-300,000, the content of the animal protein accounts for 10-75% of the total animal protein fiber, and the animal protein is single keratin or the mixture of the keratin with casein or collagen. The preparing method includes synthesis of spinning seriflux, after-treatment of the spinning seriflux, wet-process spinning, fiber solidification and fiber spinning stretch oiling compacted forming treatment. The animal protein fiber is a low cost high quality fiber with the animal protein as resource. The animal protein fiber: fineness is 1.0-3dtex, tensile strength is 0.8-3.5CN / dtex, and breaking extension is 15-45%.
Owner:中国华源集团有限公司
Manufacturing method of stainable alginate fibers
ActiveCN101736440AAchieve dyeingMeet diverse needsAlginate artificial filamentsWet spinning methodsColour fastnessState of art
The invention disclose a manufacturing method of stainable alginate fibers, which comprises the following steps of: adding a water-soluble dendrimers compound into a alginate fiber spinning solution, and solidifying, drafting, water washing and post-processing by adopting wet spinning equipment and technology to obtain the alginate fibers with excellent staining property, wherein the content of dendrimers in the alginate fibers is 1-10 percent. Compared with a traditional alginate fiber production technology, the invention has the advantages that the prepared alginate fibers can be applied to direct dyes and active dyes under a salt-free condition to realize staining and have higher dye uptake rate which generally reaches above 80 percent and is 10-15 times that of the alginate fibers produced by the traditional technology. In addition, the alginate fibers prepared by the invention has better color fastness and particularly excellent wet-processing fastness which reaches above grade 4.
Owner:QINGDAO TIANYI GROUP
Method for coloring alginate fiber stoste by adopting lake colors
ActiveCN104264280AIncrease profitHigh color fastnessAlginate artificial filamentsDye addition to spinning solutionSolventFine chemical
The invention discloses a method for coloring alginate fiber stoste by adopting lake colors, and belongs to the field of fine chemical engineering and material science. The method comprises the following steps: adding sodium alginate into deionized water, and stirring so as to dissolve sodium alginate fully to prepare alginate fiber spinning stoste; then adding lake colors into the alginate fiber spinning stoste, stirring and mixing uniformly, filtering and defoaming to obtain the lake color colored alginate fiber stoste, and preparing further to obtain lake color colored alginate fibers. The method overcomes the problem of damage of traditional dye dying on fibers; the prepared colored alginate fibers have the advantages of bright colors, high color fastness, good solvent mobility resistance and the like.
Owner:JIANGNAN UNIV
Conjugate Electrospinning Devices, Conjugate Nonwoven and Filament Comprising Nanofibers Prepared by Using the Same
InactiveUS20080102145A1Simple facilitiesSimple processSpinnerette packsCeramic shaping apparatusVoltage generatorElectrospinning
Discloses are a conjugate electrospinning devices for preparing fibers (nanofibers) having a nano-level thickness, and nanofibers prepared using the same. The conjugate electrospinning devices comprises: spinning dope main tanks (1); metering pumps (2); a nozzle block (4); nozzles (5) aligned on the nozzle block; a collector (7) for collecting fibers spun from the nozzle block; and a voltage generator (9) for applying a voltage to the nozzle block and the collector (7), wherein [I] nozzles for spinning two or more different kinds of spinning dope are aligned on a nozzle block (4) regularly or in random order in repetitive units at the same ratio or in different ratios, aligned in random order at a predetermined ratio, or aligned thereon in random order at a predetermined ratio, or aligned thereon repetitively; [II] the number of the spinning dope main tanks (1) is two or more; and [III] a spinning dope drop device (3) is arranged between the spinning dope main tanks (1) and the nozzle block (4). Since two or more different kinds of spinning dopes are combined and electrospun, and thus the physical properties (features) of a non-woven fabric and a filament can be easily managed by a simple process. Nanofibers and their non-woven fabrics can be mass produced because the fiber formation effects are maximized.
Owner:KIM EE +1
Liquid crystalline thermosets from ester, ester-imide, and ester-amide oligomers
InactiveUS20020132933A1Good physical propertiesLiquid crystal compositionsLiquid crystallineEnd-group
Main chain thermotropic liquid crystal esters, ester-imides, and ester-amides were prepared from AA, BB, and AB type monomeric materials and were end-capped with phenylacetylene, phenylmaleimide, or nadimide reactive end-groups. The resulting reactive end-capped liquid crystal oligomers exhibit a variety of improved and preferred physical properties. The end-capped liquid crystal oligomers are thermotropic and have, preferably, molecular weights in the range of approximately 1000-15,000 grams per mole. The end-capped liquid crystal oligomers have broad liquid crystalline melting ranges and exhibit high melt stability and very low melt viscosities at accessible temperatures. The end-capped liquid crystal oligomers are stable for up to an hour in the melt phase. These properties make the end-capped liquid crystal oligomers highly processable by a variety of melt process shape forming and blending techniques including film extrusion, fiber spinning, reactive injection molding (RIM), resin transfer molding (RTM), resin film injection (RFI), powder molding, pultrusion, injection molding, blow molding, plasma spraying and thermo-forming. Once processed and shaped, the end-capped liquid crystal oligomers were heated to further polymerize and form liquid crystalline thermosets (LCT). The fully cured products are rubbers above their glass transition temperatures. The resulting thermosets display many properties that are superior to their non-end-capped high molecular weight analogs.
Owner:NASA
Tencel fiber spinning process
The invention relates to the technical field of tencel fiber spinning, in particular to a tencel fiber spinning process. The tencel fiber spinning process is characterized in that the tencel fiber is prepared by adopting the following steps of: (1) preprocessing raw materials; (2) blowing; (3) carding cotton; (4) drawing; (5) roving; (6) spinning by using siro spinning technology; and (7) spooling. In the invention, the raw materials are preprocessed, and the siro spinning technology is adopted, so that knitting products prepared by the tencel fiber have optimal smoothness, drapability and elegance, are comfortable and soft and have high air permeability, rebound resilience and cohesive force.
Owner:SHANGHAI SHENAN TEXTILE
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