2384results about "Artificial filament heat treatment" patented technology

The heterocycle-containing aromatic polyamide fibers of the invention are excellent in balance among mechanical characteristics, particularly balance among tensile strength, initial modulus and strength in the direction perpendicular to the fiber axis, exhibit a high strength holding ratio under heat and humidity, and are excellent in flame retardancy, bulletproofness and cutting resistance, as compared to conventional aromatic polyamide fibers, and therefore can be favorably used in fields with severe mechanical characteristics and have stability to environmental variation. Accordingly, the heterocycle-containing aromatic polyamide fibers of the invention can be favorably used, for example, in fields including protective equipment, such as a helmet, a bulletproof vest and the like, a chassis for an automobile, a ship and the like, an electric insulating material, such as a printed circuit board and the like, and other various fields.

The present invention is directed to a process for printing conductors, insulators, dielectrics, phosphors, emitters, and other elements that may be for electronics and display applications. The present invention also relates to viscoelastic compositions used in this printing process. The present invention further includes devices made therefrom.

The invention discloses a method for preparing nano ceramic fibers, which is implemented by the following steps: 1, preparing 3 to 15 volume percent of 10 to 30 nanometer ceramic nanoparticles, 5 to 30 volume percent of spinnable high polymer, 0.5 to 5 volume percent of dispersant and the balance of solvent, wherein the total volume of the raw materials is 100 volume percent; 2, adding the spinnable high polymer into the solvent, heating the mixture in a water bath with magnetic stirring to obtain solution of spinnable high polymer; 3, adding the ceramic nanoparticles and the dispersant into the solution of spinnable high polymer obtained by the step 2, keeping the temperature of the mixture constant in a water bath, performing dispersion and ultrasonic dispersion, and performing swelling at a constant temperature to obtain ceramic nanoparticle / spinnable high polymer / solvent spinning solution; 4, controlling the electrostatic spinning process parameters of the spinning solution obtained by the step 3 to obtain nano fibers; and 5, sintering the nano fibers at 400 to 1,200 DEG C to obtain nano ceramic fibers.

An improved process for forming a PTFE mat is described. The process includes providing a dispersion with PTFE, a fiberizing polymer and a solvent wherein said dispersion has a viscosity of at least 50,000 cP. An apparatus is provided which comprises a charge source and a target a distance from the charge source. A voltage source is provided which creates a first charge at the charge source and an opposing charge at the target. The dispersion is electrostatically charged by contact with the charge source. The electrostatically charged dispersion is collected on the target to form a mat precursor which is heated to remove the solvent and the fiberizing polymer thereby forming the PTFE mat.

The invention discloses a method for preparing a polytetrafluoroethylene superfine fiber, comprising the following steps of: firstly dissolving polyvinyl alcohol into water to prepare a polyvinyl alcohol solution, then evenly mixing the polyvinyl alcohol solution with polytetrafluoroethylene concentrated dispersion to prepare a spinning solution; then making the spinning solution into a polytetrafluoroethylene / polyvinyl alcohol superfine fiber by adopting an electrostatic spinning method; and finally, carrying out polyvinyl alcohol removal aftertreatment on the prepared polytetrafluoroethylene / polyvinyl alcohol superfine fiber to obtain the polytetrafluoroethylene superfine fiber. The prepared polytetrafluoroethylene superfine fiber is white or dark brown, and the diameter of the fiber is 30-2000nm.

The present disclosure provides composite prosthetic devices comprising two or more layers of electrospun polymers and methods of preparation thereof. In some embodiments, the two or more layers can be porous and in other embodiments, one or more components is nonporous. The composite prosthetic devices can comprise various materials and the properties of the prosthetic devices can be tailored for use in a range of different applications.

The invention relates to a figured sea-island super-fine fiber, and a preparation method and a synthetic leather preparing process method using the same, which belong to the technical field of leather and leather manufacture methods. The figured sea-island super-fine fiber is characterized in that the weight percentage ratio of island components of the fiber to sea components of the fiber is 50 percent to 80 percent / 50 percent to 20 percent, wherein the island components are polyamide (PA) 6 or polyethylene terephthalate (PET), and the sea components are polyolefins or phospholamban (PLB) or polyvinyl alcohol (PVOH). The preparation method comprises the steps of slice drying and melting, composite spinning, oiling and falling into a barrel, drafting curling and drying cutting. The synthetic leather preparing method comprises the following steps that: 1. the components are sequentially prepared into a single-layer fiber net, a composite layer fiber net, needle-punched non-woven cloth and needle-punched non-weaving cloth; 2.soakage and coagulation are sequentially carried out on the non-weaving cloth, the non-weaving cloth is washed, so that a synthetic leather impregnated substrate is formed, repeated soaking squeezing, azeotropic distillation and drying are sequentially carried out, so the synthetic leather is obtained. The synthetic leather produced by the invention has the advantages of excellent mechanical performance, excellent dyeing performance, excellent dyefastness, better production controllability, economy and environment protection. Compared with natural leather and products of the natural leather, the synthetic leather has the advantages that use performance such as durability, weatherability, antibacterium mothproofing, dyefastness and the like of products is much superior to that of the natural leather and the products of the natural leather.

Rotary spinning processes, more particularly processes for making hydroxyl polymer-containing fibers using a rotary spinning die, hydroxyl polymer-containing fibers made by the processes and webs made with the hydroxyl polymer-containing fibers are provided.

A process for making a film from a nonwoven web by converting the nonwoven web into a film and films and unit dose products made therefrom are provided.

The invention discloses a method for preparing polyacrylonitrile carbon fiber protofilament by dry and wet methods. The method comprises the steps of polymerization, demonomerization and defoaming, filtration, coagulation, washing and drafting, oiling densification, steam drafting, heat setting and drying. Three-level coagulating baths at the temperature of between 10 DEG C below zero and 70 DEG C and with dimethyl sulfoxide with concentration of 10 to 60 mass percent are adopted in the coagulation step, and the first coagulating bath contains aqueous ammonia accounting for 0.05 to 1 percent of the mass of the first coagulating bath; and a spinning head is subjected to 1.5 to 5 times positive drafting in the first coagulating bath, and the drafting is 0 in the second and third coagulatingbathes. According to the method for preparing the polyacrylonitrile carbon fiber protofilament, the spinning process is stable, the broken filament is little, the spinning speed is high, the spinningis stable, the prepared protofilament has few defects, the density is not less than 1.180g / cm<3>, and the tensile strength is not less than 7cN / dtex. The protofilament can be prepared into a high-performance carbon fiber with tensile strength of more than 4.9GPa and elastic modulus of between 260 and 280GPa by high-temperature carbonization.

The present disclosure relates to the production method of inorganic nanofibres through electrostatic spinning of solution, which comprises alkoxide of metal or of semi-metal or of non-metal dissolved in a solvent system on basis of alcohol. The solution is stabilised by chelating agent, which prevents hydrolysis of alkoxide, and after homogenisation it is mixed with solution of poly(vinylpyrrolidone) in alcohol, after then the resultant solution is brought into electrostatic field, in which the electrostatic spinning is running continually, the result of which is production of organic-inorganic nanofibres, which are after then calcinated outside the spinning device in the air atmosphere at the temperature from 500° C. to 1300° C.

The present invention relates to a spacer fabric with advanced cushionability, flexibility, and thermal conductivity, and a method of fabricating the same. In accordance with the present invention, the spacer fabric is useful as a car seat fabric. In particular, the spacer fabric is applicable to a car seat equipped with an actuator and a heating / cooling apparatus inside, due to the advanced flexibility for transferring the actuator moving effect to the body, the increased cushionability for minimizing the hardness of the surface of the device, and the high thermal conductivity for effectively transferring the quick heating / cooling effect to the body.

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.

The invention relates to a production method of double-component spinneret outside composite parallel self-crimping elastic short fiber. The production method includes: adopting high molecular polymer components A and B different in shrinkage characteristics as raw materials; subjecting AB melt to outside compositing through a double-passage spinneret to obtain an AB parallel composite filament bundle; subjecting the AB parallel composite filament bundle sequentially to air-blowing cooling, oiling, winding traction and filament carrying to obtain AB parallel composite fiber protofilament; subjecting the AB parallel composite fiber protofilament sequentially to inter-cluster balance, drafting, thermal setting, oiling, crimping, loosening and drying and cutting to obtain the double-component spinneret outside composite parallel self-crimping elastic fiber. The fiber has excellent and lasting crimping performance, is high in elasticity, elastic recovery rate and spinnability, wide in application range and suitable for nonwoven filling.

The invention relates to a preparation method of a functional polyester fiber. The preparation method comprises the following steps: performing esterification by stages, wherein dihydric alcohols, polyhydric alcohols and functional inorganic powder are mixed according to a certain mole ratio, in the first esterification stage, acid is slightly excess to ensure that monomers with low capability of participating in esterification reaction in the polyhydric alcohols fully react and are grafted into polyester molecular chains, and in the second esterification stage, the dihydric alcohols are replenished to control the terminal carboxyl group of copolyester. The preparation method has the advantages that polyhydric functional groups can improve the apparent viscosity of a system and play a role in wrapping the introduced functional inorganic powder (such as far infrared ceramic inorganic powder, titanium dioxide powder and zinc oxide antibacterial powder), thus improving the dispersion uniformity of particles; settlement is unlikely to happen in the polymerization process and then functional polyester is prepared through condensation polymerization; the functional polyester fiber is finally prepared by carrying out melt spinning on the prepared polyester, has good moisture absorption property and flexibility and can be widely used for preparing far-infrared moisture absorbing and sweat releasing antistatic and antibacterial fabrics next to the skin.

The invention relates to a process for producing a polyester industrial long fiber for processing a safe air bag of an automobile, which sequentially comprises the following steps: A. processing a polyester slice with high viscosity: enabling the viscosity of the polyester slice to reach 1.0-1.1dl / g; B. melting and spinning: transmitting the polyester slice after solid phase polymerization to a spinning screw rod extruder, melting in a spinning screw rod, entering a spinning assembly by a metering pump and extruding from a fiber spray plate with a diameter of 190 mm to 220 mm to spin fusant, , then heating by a slow cooling heater, carrying out cooling for molding by a side-molding blowing device and then entering a spinning passage; C. stretching and winding: oiling the surface of a fiber and carrying out second-grade high-speed stretching with the total stretching multiple being 5.0 to 5.8, carrying out high-temperature loosing thermoforming at 230 DEG C-250 DEG C and carrying out winding for molding in the range of the winding process speed of 2,500-3,000 m / min to prepare a finished product. The fiber for the safe air bag, which is produced by the process, can completely replace a nylon 66 fiber, is used for spinning terylene safe air bag fabrics and greatly reduces the processing cost.

The invention discloses a graphene fiber non-woven fabric and a preparation method thereof. The non-woven fabric is obtained by filtering and depositing a graphene short-fiber dispersion solution through a filter net and performing drying and reduction, so that the structural unit of the non-woven fabric is disorderly-stacked and bonded graphene short fiber, and fiber is overlapped to form a large number of holes through which liquid of gas can pass. The graphene fiber non-woven fabric has the good mechanical strength and tenacity, is completely composed of graphene fiber, does not contain high polymer materials as a skeleton or adhesives, the electricity and heat conducting performance of the reduced network structure overlapped by the graphene fiber is excellent, and the non-woven fabric can be used as a multifunctional high-performance fabric.

The invention relates to a method for preparing a modified copolyester composite fiber, in particular to a method for preparing a low-melting-point polyester composite fiber by adopting continuous polymerization and melt direct-spinning. The method comprises the following steps: slurry is prepared from raw materials in proportion and added continuously into an esterification system for an esterification reaction, an obtained oligomer is uniformly mixed with polyether, the mixture enters a homogenizing kettle for transesterification and pre-polycondensation, a product is uniformly mixed with a chain extender for final polycondensation, and an obtained low-melting-point polyester melt and a common polyester melt enter a composite spinning assembly to prepare the low-melting-point polyester composite fiber which comprises a common polyester core layer and a low-melting-point polyester cortex layer. The method has the advantages as follows: a side reaction of thermal degradation of polyether components is inhibited effectively, and the color and spinnability of the low-melting-point polyester melt are improved; the problem of poor performance of composite spinning of the low-melting-point polyester on the cortex layer and the common polyester on the core layer due to large dynamic viscosity difference of the melt is solved, and the composite fiber is well formed; the production efficiency of the low-melting-point polyester composite fiber is improved.

The invention relates to high-strength high modulus polyimide fiber and a preparation method thereof, which belongs to the high performance organic fiber technical field. The fiber comprises the polyimide fiber which is prepared by biphenyltetracarboxylic dianhydride (BPDA), para-phenylene diamine (pPDA) and 2-(4-aminophenyl)-5-aminobenzimidazoles (BIA), wherein the mol ratio of pPDA to BIA is 1:10-3:1, other di-amine and di-anhydride monomers are added in the synthesis process, a gradient temperature reaction method and a one step continuous preparation method are used in the preparation process, so that the difficulties for synthesizing and processing due to the content increase of 2-(4-aminophenyl)-5-aminobenzimidazoles are solved, the problems of poor homogeneity and stability of thefiber performance can be solved, and the high-strength high modulus polyimide fiber can be obtained, the strength can reach 4.5GPa, the modulus can reach 201GPa, and the raw material source is wide, the spinning process can be continuously performed, the method has low cost and high efficiency which is capable of realizing the industrial production.

The invention provides a three-dimensional oil-water separating material based on the static spinning technology and a preparation method thereof, belonging to the technical field of water treatment. The method specifically comprises the following steps: (a) preparing a static spinning solution; (b) selecting a proper solvent to directly receive static spinning nano fibers to obtain a nano fiber solution; (c) shaping and freezing the nano fiber solution, and drying through a freezing drying machine to obtain the three-dimensional nano fibers; (d) pre-oxidizing, carbonizing and activating the three-dimensional nano fibers to obtain three-dimensional carbon nano fibers; (e) wrapping the three-dimensional carbon nano fiber glue with lipophilic and hydrophobic films so as to obtain the final three-dimensional oil-water separating material. According to the preparation method of the three-dimensional oil-water separating material, the composition and structure of the material are easily controlled; the mechanical performance and hydrophobic performance of the materials can be effectively improved; the oil-water separating effect is good; the material can be recycled and has a wide application prospect in the oil-water separation field.

The invention belongs to the field of materials, particularly belongs to the field of fiber materials, and more particularly relates to a method for modifying chinlon 6 fibers and a modified product. The invention aims at improving a mixing manner of modified graphene so that the dispersity of graphene in the chinlon 6 fibers is improved. In order to realize the aim, the invention discloses the method for modifying the chinlon 6 fibers. The method comprises the specific steps: heating hexanolactam and smelting; adding graphene oxide powder and de-ionized water; polymerizing mixed fluid in two steps; introducing the polymerized fluid into a granulator to be sliced; and extracting the fluid, drying, smelting, spinning, extruding, cooling, coating oil, stretching and winding in sequence to form the enhanced chinlon 6 fibers. Graphene oxide can be effectively and uniformly dispersed into the chinlon 6 fibers, and furthermore, the breaking strength and the Young modulus of the chinlon 6 fibers are enhanced, and the application range of the chinlon 6 fibers is expanded.

The invention discloses a processing method of a high-strength low-shrinkage nylon 6 fine denier filament, belonging to the technical field of nylon filament processing. The method comprises the following steps: preparing materials: adding the nylon 6 slices into a bin of nitrogen protective gas to obtain a material to be melted; melting: introducing the material to be melted into a screw extruder for melting to obtain a melt; forming: introducing the melt from the upper part of a spinning box, and ejecting from a spinneret orifice of a spinneret plate to obtain a filament bundle; cooling: introducing the filament bundle into a slow-cooling area for slow cooling, forming through side-blowing air cooling, and further cooling through a channel; oiling and pre-interlacing: oiling the cooling-formed filament bundle through an oil lip or oil wheel, and pre-interlacing; drafting: feeding the filament bundle to be drafted through a feeding roller, drafting through a heat roller, and then performing relax-type setting to obtain the drafting-set filament; and re-interlacing and re-oiling: re-interlacing and re-oiling the drafting-set filament before packaging to obtain the high-strength low-shrinkage nylon 6 fine denier filament. The method can adapt to different purposes of products, and can be applied to the occasions having rigorous requirements on the breaking strength and dry heat shrinkage.

The invention relates to a self-enhanced polylactic acid fiber and a preparation method thereof. The self-enhanced polylactic acid fiber provided by the invention is a uniform mixture of a vertical compound crystal polylactic acid micro-fiber and a polylactic acid substrate. In 100 weight parts of self-enhanced polylactic acid fiber, 1-30 parts of vertical compound crystal polylactic acid micro-fiber and 70-99 parts of polylactic acid substrate are contained. The preparation method of the fiber comprises the following steps: firstly, respectively carrying out vacuum drying on PLLA (poly L lactic acid) and PDLA (poly D lactic acid); physically mixing PLLA with PDLA after being dried; fusing the mixture; collecting primary fibers under the conditions that a spinning temperature is 225-245 DEG C and a spinning speed is 500-2500 meters per minute; and thermally drafting and thermally shaping the primary fibers. Compared with the common polylactic acid fiber, the self-enhanced polylactic acid fiber disclosed by the invention has the advantages of higher constant temperature mechanical strength, higher high temperature mechanical strength and lower boiling water shrinkage, so that the use demand is met and the application field is expanded.

The invention relates to a novel preparation technology of polyoxymethylene fiber, in particular to the novel preparation technology of the polyoxymethylene fiber via multi-stage slow cooling and three-stage drawing with different media, which comprises the following steps: vacuum-drying polyoxymethylene granular materials, heating and melting via a screw extruder, melting and extruding by a spinneret, leading small melt flow to pass through the multi-stage slow cooling, carrying out high-speed traction, passing through a moistening and oiling cluster, winding, then obtaining as-spun fiber, carrying out hot air drawing and two times of drawing with different types of solvent, then carrying out hot molding and finally preparing the polyoxymethylene fiber. The novel prepration technology can solve the problems of matching between the multiple sections of atmosphere and temperature and the spinning process control and the control of the drawing with multiple media and make up for the deficiencies that the single atmosphere and temperature and the single medium drawing of the prior art lead the structure to be difficult to stable and uniform.

The invention discloses a preparation method for a graphene and multiwalled carbon nanotube synergetic enhanced polymer fiber. The preparation method comprises the following steps: conducting functional processing on oxidized graphene and a hydroxylated multiwalled carbon nanotube to be mixed with a monomer capable of being subjected to condensation polymerization, conducting condensation polymerization to obtain a composite master batch, processing the composite master batch, fusing and squeezing out the processed composite master batch to obtain a nascent fiber, and conducting postprocessing on the nascent fiber so as to obtain the graphene and multiwalled carbon nanotube synergetic enhanced polymer fiber. According to the preparation method, the dispersion degree of carbon material in fiber forming polymer can be obviously improved, and then the mechanical strength of the prepared fiber can be improved.

The invention discloses a method for producing polythene fiber with high strength and high modulus by melting fiber drawing and a device thereof. The method includes steps as follows: blend composition of polythene with super high molecular weight and three element blend composition of polythene with super high molecular weight are used as raw material, the raw material is spout fibre adobe after melted through a screw extruder, the fibre adobe is preset drafted after cooling, then low power drafted after once heating, then high power drafted after twice heating, finally is processed heat processing for obtaining polythene fiber with high strength and high modulus. The screw extruder, a cooling mechanism, a drafting machine processing preset drafting, an once heating mechanism, a low power drafting machine, a twice heating mechanism, a high power drafting machine, a heat processing mechanism, a winding reeling machine are arranged in the device orderly. The invention provides a producing method with simple technique, short producing flow, low cost and no pollution aiming at problem that UHMWPE melting spout fibre process has difficult to spin, and provides a device with compact equipment and easy to operate.

The invention discloses an anatase type titanium dioxide nano-fiber photocatalyst and a preparation method thereof, and belongs to the technical field of nano materials and photocatalysts. By the method, a composite nano-fiber is prepared by an electrostatic spinning technology, and then is calcinated in the air to obtain the titanium dioxide nano-fiber photocatalyst, but a sol-gel technology is not used in the process, so that process parameters are easy to adjust and control, multiple factors which influence the final crystallization degree, crystal form, granular distribution and size of a titanium dioxide nano-fiber are eliminated, and a catalytic efficient photocatalysis material can be easily obtained. The titanium dioxide nano-fiber prepared by the method has a large specific surface area, so that visible light is high in catalytic efficiency. The preparation method has a simple process and is easy to adjust and control, and the production cost is reduced. The photocatalyst can be used as a novel photocatalysis material, is high in photocatalysis efficiency under the action of the visible light and meets the requirement and the development direction of a new generation of photocatalysis materials.

An apparatus and method for providing controlled heating, cooling and motion, in a device such as an active robotic automobile seat, are disclosed. A shape memory alloy (SMA) element, which changes shape upon application of a temperature change to the SMA element, is coupled to a thermoelectric device. Heat flows through the TED upon application of an electrical current through the TED. The apparatus is operable in one of a plurality of modes. In a first mode, a current is applied through the TED to cause a temperature change in the SMA element to change the shape of the SMA element. In a second mode, a current is applied to the TED to cause heat flow in a space adjacent to the apparatus. By controlling application of current to the TED, controlled motion, heating and cooling are achieved in the seat.