Spinning fibre-forming electrode
FIELD: process engineering.
SUBSTANCE: invention relates to production of nanofibres by electrostatic process. Spinning fibre-forming electrode designed to carry polymer solution or melt in electric field for fibre forming in devices intended for fibre forming by electrostatic process from said solutions or melts. Said electrode features elongated shape and comprises two end parts arranged at carrier. Fibre-forming elements made of string or wire bar are laid between said two parts. In compliance with this invention said fibre forming electrodes are inclined to axis of spinning of said electrode.
EFFECT: no sputter of polymer solution or melt.
8 cl, 4 dwg
Area of technology
The invention relates to a rotating fiber electrode oblong serving to make the solution or melt of the polymer matrix from the reservoir to the electric field for forming fibers in devices for the production of nanofibers by electrostatic method of forming fibers from solutions or melts of polymeric matrix containing a pair of end parts arranged on a carrier means, between which laid fiber-forming strings or wire rods.
The level of technology
The known device for production of nanofibres from the polymeric solution by electrostatic method of forming fibers, comprising rotary located fiber-forming electrode of elongated shape, as shown, for example, in WO 2005/024101 A1. The device comprises a fiber-forming electrode in the form of a cylinder which rotates around its main axis and the bottom surface is wetted by immersion in a polymer solution. The polymer solution is carried on the surface of the cylinder in an electric field between the fiber-forming and precipitation electrodes, where the formation of nanofibers, which moved in the direction to the receiving electrode and before it is placed on the lining material. This device could very well form nanovel�kPa from aqueous solutions of polymers, but the layer of nanofibers deposited on the lining material is uneven throughout its length.
From DE 10136255 B4 discloses a device for producing fibers from a solution or melt of a polymer containing at least two fiber-forming electrode device, each of which consists of a system of parallel wire rods arranged on a pair of endless belts, encircling two guide cylinders, which are arranged one above the other, wherein a lower guide cylinder partially immersed in the solution or the polymer melt. Between the above two fiber-forming electrode devices is sent to a textile material, serving as an opposite electrode, wherein fiber-forming electrode device simultaneously applied to the layer of fibers on the face and reverse side of the textile material.
Fiber-forming electrode connected to the high voltage source together with the opposite electrode, which is a conductive moving belt. The solution or the polymer melt is made with wire rods in an electric field between the fiber and the opposite electrode, where from the solution or melt of the polymer molded fiber, which moved to the opposite electrode and stacked on �excelleny material, arranged on the opposite electrode. The disadvantage of this solution is the long residence times of the solution or melt of the polymer in an electric field, and consequently, the solution and the polymer melt relatively quickly grow old and, therefore, their properties in the process of forming fibers change that results in changes of parameters preformed fibers and, in particular, of their diameter. The next disadvantage is the arrangement of the wire rods of the fiber-forming electrode on a pair of endless belts, or which are conductive and have a very negative effect on an electric field generated between the fiber and the opposite electrode, or do not possess electrical conductivity, and a high voltage is applied to the wire rods of the fiber-forming electrodes with the aid of sliding contacts, mainly on one to three bar, unnecessarily complicates the device for forming fiber.
From WO 2008/028428 known rotary fiber-forming electrode of elongated shape, applied in the device for production of nanofibers by electrostatic method of forming fibers from polymer solutions containing a pair of end parts between which are fiber-forming wire elements equally spaced along the circumference � parallel to the axis of rotation of the rotating fiber-forming electrode. Mechanical parts are made of non-conductive material, and all the fiber-forming conductive elements are connected.
Fiber-forming elements arranged parallel to the axis of rotation of the rotating fiber-forming electrode, although provide good conditions for molding fiber in an electric field, but when they are stepping out of the solution or melt of the polymer, due to surface tension of the solution or melt of the polymer, especially when the length of the electrodes is greater than 0.5 m, the spraying of the solution or melt of the polymer, since the fiber-forming element along the length is above the level at one point.
The aim of the invention is the preservation of good conditions for forming fibers and elimination of spatter in the output of the fiber-forming element from a solution or melt of the polymer.
Summary of the invention
The purpose of the invention is achieved by a rotary fiber-forming electrode according to the invention, the essence of which is that fiber-forming strings or wire rods are at an angle to the axis of rotation of the rotating fiber-forming electrode. As a consequence of the angle of the axes of fibre string or wire rod comes out of the solution or melt of the polymer matrix gradually and therefore prevent�asaeda spatter even when the lengths of the fiber-forming electrode over 1 m.
To achieve optimal conditions for forming fibers advantageously, when the ends of fibre string or wire rods on both end parts are located at the same distance from the axis of rotation.
To provide an easy supply of electric voltage on fiber-forming strings or wire rods advantageously, if the mechanical parts are made of a conductive material. This solution is enough, when electric voltage is applied in a solution or melt of the polymer matrix, and because of the electrical conductivity of the end parts, the part which resides in the solution or melt of the polymer matrix, all fiber-forming strings or wire rods are under tension.
This is especially important when the length of the rotating fiber-forming electrode is more than 1 m it is important that all fiber-forming strings or wire rods have been carefully strained. This is achieved by a tensioning means.
Fiber-forming strings or wire rods spinning fiber-forming electrode may be formed as one continuous string, or as one continuous Provolone rod, and at least one end part is movable in the direction of the axis of rotation of the rotating fiber-forming electrode and connected to �etajnim agent.
The tensioning means comprises a stop attached between the end parts and a compression spring located between the stop end and move the item.
The emphasis in the preemptive execution has the shape and dimensions of the mechanical parts and provided with openings for the passage of fibre string or wire rods movable mechanical parts on which they are fixed.
Fiber-forming strings or wire rods on the end parts can be located separately, and each fiber-forming the wire or each wire rod corresponds to at least one individual tensioning means.
The individual tensioning means mainly consists of a compression spring located between the end part and an end element mounted on the end of voloknoobrazujushchih string or wire rod.
Brief description of the drawings
Spinning fiber-forming electrode according to the invention is shown schematically in the accompanying drawing, where Fig.1 - axonometric view of a rotary fiber-forming electrode; Fig. 2, version with tensioning elements consisting of a single string or a single wire rod with a tensioning tool; Fig. 3, version with separate tension elements and the Central stretch of SR�the rotary; Fig. 4, version with separate tension elements and individual tensioning means.
Detailed description of the invention
Spinning fiber-forming electrode comprises a support means 1, which shows the performance consists of a shaft, which is perpendicular to its longitudinal axis 11, which serves as an axis of rotation of the rotating fiber-forming electrode are arranged end parts 2, 3. The support means 1 may be made of, for example, as a tube or other appropriate body. In the example of execution shown in Fig.1, both end parts have the same diameter, and their circles evenly made grooves 21, 22, 23, 24, 25, 26; 31., 32, 33, 34, 35 and 36 in which is located a wire rod or wire 4, wherein portions of the string or wire rod 4, stretched between the end parts 2, 3 form a fiber-forming elements 41, 42, 43, 44, 45, 46. End part 3 is rotated relative to the end parts 2, therefore, the axis of the fiber elements 41, 42, 43, 44, 45, 46 disposed at an angle to the axis 11 of rotation of the fiber-forming electrode. The ends
fiber elements 41, 42, 43, 44, 45, 46 on both end parts 2, 3 are located at the same distance from the axis of rotation. End parts 2, 3 is made of a conductive material. In the examples of execution shown in Fig.1 and 2, in�osnabrugge elements 41, 42, 43, 44, 45, 46 are formed as one continuous string, or one continuous wire rod 4. In the performance of Fig.1 string or wire rod 4 is fixed in a stationary end parts 2, 3.
As shown in Fig.2, one end detail 2 are fixed, and the second end part 3 is located on the host vehicle 1 with the possibility of axial movement. Between the end parts 2, 3 on the host vehicle 1 is fixedly installed emphasis 5, between which and the movable end part 3 is a compression spring 6. In the example of execution, the focus has the shape and dimensions of the mechanical parts and is provided with holes or slots for the passage of the string or wire rod 4, which is fiber-forming elements 41, 42, 43, 44, 45, 46.
In the examples of execution shown in Fig.3 and 4, the fiber-forming elements 41, 42, 43, 44, 45, 46 created as a separate string or wire rods 4. In the performance of Fig.3 as performed in Fig.2, one end of the workpiece 2 mounted in a fixed position, and the second end part 3 is installed on the host vehicle 1 with the possibility of axial movement. Between the end parts 2, 3 on the host vehicle 1 is fixedly installed emphasis 5, between which and the movable end part 3 is a compression spring 6. In the example of execution, the focus has the shape and dimensions of the mechanical parts and SN�been holes or slots for the passage of the strings or wire rods 4, which fiber-forming elements 41, 42, 43, 44, 45, 46. In the unaired version, the diameter of the stop 5 is less than the diameter of the end parts 3. In this version, all the tension of the individual fiber elements 41, 42, 43, 44, 45, 46 is one movable mechanical part 3 and the compression spring 6, which requires adherence to equal the length of the individual fiber elements 41, 42, 43, 44, 45, 46.
This problem is eliminated at the expense of execution, shown in Fig.4, where each fiber-forming element 41, 42, 43, 44, 45, 46 corresponds to individual tensioning means comprising a compression spring 6 and the end member 7 fixed to the end of the fiber-forming element 41, 42, 43, 44, 45, 46.
If necessary change the length of the rotating fiber-forming electrode can be a simple way to move the end parts 2, 3 on the host vehicle 1. For example, can be performed in the host vehicle 1 fixing holes with constant steps. Therefore, in this case, the user has the ability to change the distance between the end parts depending on the width of material being processed.
1. Spinning fiber-forming electrode, an employee for making a polymer solution from the reservoir of polymer solution or melt in an electric field for forming fibers in devices Dneprospetsstal of nanofibers by electrostatic method of forming fibers from polymer solutions or melts, and having an elongated shape, containing a pair of end parts (2, 3), which are arranged on a carrier vehicle (1) and between which laid fiber-forming elements(41, 42, 43, 44, 45, 46), made of string or wire rod (4), characterized in that the fiber-forming elements(41, 42, 43, 44, 45, 46) are inclined to the axis (11) of rotation of the rotating fiber-forming electrode.
2. Spinning fiber-forming electrode according to claim 1, characterized in that the ends of the fiber elements(41, 42, 43, 44, 45, 46) on both end parts (2, 3) are located at the same distance from the axis (11) of rotation.
3. Spinning fiber-forming electrode according to claim 2, characterized in that the end parts (2, 3) made of a conductive material.
4. Spinning fiber-forming electrode according to any one of claims.1-3, characterized in that the fiber-forming elements(41, 42, 43, 44, 45, 46) consist of one continuous string, or one continuous wire rod (4), wherein at least one end part (3) mounted for displacement in the direction of the axis (11) of rotation of the rotating fiber-forming electrode and connected to the tensioning means.
5. Spinning fiber-forming electrode according to claim 4, characterized in that the tensioning means consists of a cap (5) mounted between the end parts (2, 3) and compression spring (6) located between UE�rum (5) and movable end part (3).
6. Spinning fiber-forming electrode according to claim 5, characterized in that the stop (5) has the shape and dimensions of the end parts (2, 3) and provided with openings for the passage of fibre elements(41, 42, 43, 44, 45, 46) movable end part (3), which is fixed to the fiber-forming elements(41, 42, 43, 44, 45, 46).
7. Spinning fiber-forming electrode according to any one of claims.1-3, characterized in that the fiber-forming elements(41, 42, 43, 44, 45, 46) installed on the end parts (2, 3) separately, and each of them corresponds to at least one individual tensioning means.
8. Spinning fiber-forming electrode according to claim 7, characterized in that the individual tensioning means comprises a compression spring (6) located between the respective end part (3) and an end element (7) fixed to the end of the fiber-forming element(41, 42, 43, 44, 45, 46).
FIELD: process engineering.
SUBSTANCE: invention relates to production of several synthetic threads to be stretched and wound and to device to this end. Note here that synthetic threads are formed parallel with each other, cooled and tightened by extrusion of thin bundles of filaments. Note also that said threads are stretched as a bundle of threads are wound on reels. To allow identical physical conditions, threads after extrusion and before stretching are pulled off independently by separate godet wheels. This allows identical conditions of extrusion, cooling and stretching of every thread. Proposed device comprises several separate godet wheels arranged side by side and ahead of stretching device relative to one of the threads. To pull off a definite thread, said godet wheels can actuate an appropriate drive.
EFFECT: higher efficiency.
12 cl, 4 dwg
SUBSTANCE: water composition contains in wt % 15-40 solution of interpolymeric complex, 50-80 aqueous solution of thickening agent (concentration 8 - 14%) and acidity regulator 2H HCl to pH=2 - 4. Interpolymeric complex is obtained by mixing 1% solution of polyacrylacid and 10% solution of polyvinyl alcohol with component ratio 1:1. As thickening agent, applied is polyvinyl alcohol or polyethylenoxide. Viscosity of composition constitutes from 0.5 to 0.9 Pa·s.
EFFECT: application of claimed spinning composition makes it possible to obtain fibres with diameter 200 - 400 nm with high indicators of hygroscopicity and steam-permeabilityat quite fast rate.
1 tbl, 3 ex
FIELD: process engineering.
SUBSTANCE: invention relates to production of strands of composite material by combining continuous glass fibers with continuous fibers of organic high-shrinkage material used as reinforcing material. Thermoplastic fibers, stretched and heated to softening point, are thrown on revolving drum 17 at the rate exceeding operating rpm of said drum. Web 10 of said thermoplastic fibers are mixed on drum surface with glass fiber bundle or web 2 to make composite material strand. Said drum 17 has multiple holes and element 19 dividing drum inside into, at least, two compartments, one with rarefaction to keep thermoplastic fibers in initial crimp state and another one with increased pressure to separated web from drum surface. Produced strand features uniform distribution of fibers and stable properties.
EFFECT: composite material with liner glass fibers and crimped thermoplastic fibers.
8 cl, 2 dwg
FIELD: polymer chemistry.
SUBSTANCE: invention refers to the devices for thread cooling during formation of thermoplastic materials for manufacturing of monofiber thread of fleece or fiber out of polymer materials, i.e. polypropylene. The device includes tank (1) made with possibility of running water supply and elements (2) of thread direction with cuts (3) for thread placements. The elements (2) of thread direction are made of elastic hygroscopic material and are established with possibility of filling the material with water from the tank (1) for thread cooling. The cuts (3) for thread placement are made as cuts in elastic hygroscopic material.
EFFECT: decrease of defects due to reduced probability of thread tearing during cooling with decreased size of cooling unit.
6 cl, 2 dwg
FIELD: machine-building industry.
SUBSTANCE: device comprises a shaping device, treatment device and pick-up device which are stacked one above the other making a number of positions for one or several filaments production on each of the devices along longitudinal side of the machine. Besides, the platform of provided for process positions servicing. It is located along longitudinal side of the machine at the level between treatment device and pick-up device so that all necessary filament charging operations or device service operations could be done.
EFFECT: improved maintainability of device and reduced number of man-hours.
10 cl, 5 dwg
FIELD: textile, paper.
SUBSTANCE: method for fibrous material production consists in short-term treatment of polystyrene or its wastes in reactor with air or steam and air mixture with steam content of 50% vol. at the temperature of 90-120°C, pressure of 3 MPa for 30 seconds.
EFFECT: simple, efficient and ecologically pure method is developed for production of fibrous material from polystyrene or its wastes with high yield and good sorption properties.
9 ex, 1 tbl
FIELD: machine building.
SUBSTANCE: line consists of extruder, of unit of first broach, of device for thread cooling, of thread directing elements, of unit of second broach and of cut-off mechanism. Also, the line consists of a directing support element. The cut-off mechanism is positioned behind the support element. The thread cooling device is installed between the unit of the first and the second broach. Thread is laced-up S-like into upper and lower rollers in the first unit of broach. The upper roller is driven. The elements of thread direction in the device of thread cooling transfer thread in linear motion through the unit of the second broach and the directing support element to the cut-off mechanism.
EFFECT: arrangement of compact lines of high efficiency for fabrication of qualitative fibre.
12 cl, 8 dwg
FIELD: machine building.
SUBSTANCE: installation is designed for production of fibres out of thermo-plastic by means of supplying polymer melt and/or mixtures of polymers inside heated rotating fiberisator, in forming and simultaneous pulling fibres from jets of melt. The installation consists of an extruder, fiberisator, transporter for fibre collection, system for control and adjustment of temperature in the fiberisator; the system includes an optical pyrometre, power source and inductor. Notably, the rotating vertically installed fiberisator heated from the inductor is made in form of a cylinder with internal surface formed with a truncated cone, where angle between a shaft axis and an internal wall of the fiberisator is not less 30° and not more 35°, and with a lower truncated cone of the fiberisator where angle between a vertical axis of the fiberisator and cone generatrix is 45-60°. In a bottom part of the fiberisator and along circumference there are made openings; melt of thermo-plastic material flows via the openings under effect of centrifugal forces at fiberisator rotation. Angle of incline of secant flow of air from the opening of the inductor relative to vertical axis of the fiberisator is not less 10° to facilitate air flow directing formed fibre to a side opposite to the fiberisator. Diametre of produced fibre is adjusted by velocity of rotation and temperature of fiberisator walls, while output is determined with diametre and number of the openings in the fiberisator.
EFFECT: upgraded quality and physical-mechanical properties of produced fibre and reduced losses of source raw material due to destruction.
4 cl, 3 dwg, 1 tbl
FIELD: machine building.
SUBSTANCE: invention is related to the field of synthetic materials production from thermoplastic substances and their mixtures, including high quality stocks of raw materials and different types of household and industrial wastes of thermoplastic materials, and may be used for production of sorbents that entrap oil and oil products from water. Device for production of fibre material comprises extruder, nozzle of melt supply with heating elements, fibre generator. Fibre generator is arranged in the form of nozzle, compressed air supply duct is tangentially fixed to its body. Fibre generator is equipped with mouthpiece, outlet opening of which is located in the same plane with outlet opening of fibre generator. Nozzle for melt supply is equipped with heating elements installed coaxially around nozzle and at the same distance from each other. Flat ribs or cylindrical rods installed in staggered order along nozzle perimeter at the same distance from each other are located inside the nozzle. In order to improve heat emission and mixing, helical rib may be installed inside the nozzle.
EFFECT: simplification of design and increase of device efficiency and reliability.
2 cl, 5 dwg
FIELD: textiles, paper.
SUBSTANCE: invention relates to technology of synthesised fibres production, in particular, to manufacturing of the product similar to monofibre. The method involves exposure of the predecessor containing an assemblage of endless elementary polyolefine fibres to temperatures within the range of polyolefine melting temperature for a period of time sufficient for, at least, a partial melting of adjacent fibres. Simultaneously drawing of the predecessor is carried out up to extent of drawing equal to at least 2.8.
EFFECT: manufacturing of the product similar to monofibre which demonstrates improved drawability that makes it suitable for such a sphere of application,as, for example, fishing line.
6 cl,1 tbl, 3 ex
FIELD: technological processes.
SUBSTANCE: device for production of 2D or 3D fibre materials from microfibres or nanofibres comprises a set of metal spinning nozzles (3), connected with the first potential, a set of electrodes (6) of a collector facing the set of nozzles (3), arranged at regular intervals and connected with the second potential, and a collecting plate (7) or a collecting cylinder (14) for collection of microfibres or nanofibres laid between pairs of adjacent electrodes (6) of the collector. The substance of the invention consists in the following: a set of collector electrodes (6) comprises at least two electrodes (6) of the collector, arranged in one plane, and the collecting plate (7) on the line of its crossing or along the tangent to the collected cylinder (14), which is perpendicular to the line of contact with the plane of the collector electrodes (6), forming with the plane of the collector electrodes (6) an angle α in the range between 0° and 90°, at the same time the collecting plate (7) or the collecting cylinder (14) may move relative to the electrodes (6) of the collector in the direction in the plane that is perpendicular to the plane of collector electrodes (6), and where the axis of the electrode (6) lies in direction of movement of the collecting plate (7) or the collecting cylinder (14), forming with the axis of this electrode (6) the angle β, the value of which lies between 0° and 90°.
EFFECT: device makes it possible to create large flat and volume objects from ordered nanofibres.
9 cl, 14 dwg
SUBSTANCE: invention relates to method of spinning fibre, containing polypeptide polymer, as well as to products, including said polymer fibre. Method of fibre spinning includes draft of fibre from dope solution, containing polymer, preferably silk polypeptide which can be introduced into water solution with concentration constituting at least 0.15 mg/ml, polyacrylamide (PAA), which increases longitudinal viscosity of dope solution, and solvent. Invention makes it possible to obtain fibres, including living and non-living biological material, which could perform function of framework material for fabric engineering and growing artificial organs.
EFFECT: application of PAA in dope solution results in obtaining smooth and homogeneous fibres, non-biodegradable and long-lasting, in addition, application of very low concentrations of polymers and/or very low concentrations of improvers of PAA longitudinal viscosity facilitates spinning of fibres from dope solution.
24 cl, 4 dwg, 7 ex
SUBSTANCE: invention relates to technology of obtaining ultrathin polymer fibres by method of electrospinning and can be used for spinning non-woven porous fibrous materials, applied as separating partitions, for instance, for filtration of gases and liquids, for manufacturing diffusion partitions, separators of chemical sources of current, etc. Solution for spinning contains 2.5-4 wt.p. of phenolformaldehyde resin, 2.5-4 wt.p. of polyvinyl butyral, 92-95 wt.p. of ethyl alcohol and as modifying additives 0.02-0.2 wt.p. of tetrabutylammonium iodide or 0.01-0.1 wt.p. of lithium chloride.
EFFECT: invention provides increase of solution electroconductivity, increased output of ultrathin fibres with diameter less than 0,1 mcm.
1 tbl, 7 ex
SUBSTANCE: method and apparatus for producing fine fibres via fibre electrospinning by applying an electric field between a primary electrode and a counter electrode lying at a distance from the primary electrode and often parallel thereto. The working surface of the primary electrode is coated with a polymer solution. An electric field is created between the primary electrode and the counter electrode having sufficient strength to cause formation of fine fibres in the space between the electrodes. The working surface of the primary electrode coated with a polymer solution consists of corresponding parts of surfaces of a plurality of elements that are semi-submerged in the working state and are freely lying (not connected to anything), said elements resting at the bottom of a bath or tray or some other supporting structure(s). A tool is used, which enables to apply the polymer solution on the surface of the freely lying elements protruding from the solution via rotation thereof in the polymer solution, such that their surface is coated with a thin layer of the polymer solution.
EFFECT: method and apparatus according to the present invention enable to perform spinning with high efficiency while eliminating problems encountered in the previous technological level.
12 cl, 8 dwg
SUBSTANCE: invention relates to chemical-pharmaceutical industry and represents artificial dura mater, produced from electrospinning layers by technology of electorspinning, with electrospinning layer, consisting of, at least, hydrophobic electrospining layer, which is produced from one or several hydrophobic polymers, selected from polylatic acid and polycaprolactone.
EFFECT: invention ensures creation of artificial dura mater, which has good tissue compatibility, anti-adhesiveness and possibility of introducing medications, preventing cerebrospinal fluid outflow during regeneration of person's own dura mater.
30 cl, 7 ex, 11 dwg
SUBSTANCE: electrostatic field is formed in fibre-forming space between the fibre-forming element of a fibre-forming electrode, which is connected to one terminal of a high-voltage source and is located in a fibre-forming position, and a precipitation electrode connected to the second terminal of the high-voltage source to which a polymer matrix is fed from a reservoir with the matrix in an electrostatic field for forming fibre on the surface of the fibre-forming element of the fibre-forming electrode, wherein temperature of the fibre-forming elements of the fibre-forming electrode is raised higher than ambient temperature by direct contact heating of the fibre-forming elements.
EFFECT: more technologically effective method, and simple and efficient design of the apparatus.
8 cl, 2 dwg
SUBSTANCE: method includes spinning of electroconductive solution of organic and non-organic polymers and predecessor of organic polymer in presence of electric field between tip and earthing source till composite fiver is received. At that organic and non-organic phases of composite fibres are mixed and react with each other with production of -Si-O-M- links, where M is selected from the group consisting of Si, Ti, Al and Zr. The author offers composite fibre received by the above method and composite product including polymer matrix and composite fibres introduced to it.
EFFECT: improvement of method.
28 cl, 2 dwg, 1 tbl, 5 ex
SUBSTANCE: fibre electrospinning is carried out from an electroconductive solution of polymer in presence of electric field between a nozzle and a source of earthing. In the method realisation the polymer before and after electrospinning process is exposed to linking reaction. At the same time the polymer contains linked silane groups along the length of the main chain of polymer, and the linked groups react with water, including water contained in air. The fibre made according to the method of electrospinning contains links -Si-O-Si-.
EFFECT: using linking reaction before and during the process of electrospinning results in increased viscosity of polymer solution, making it possible to form the fibre and to reduce usage of thickeners to the minimum.
14 cl, 2 dwg, 1 tbl, 3 ex
SUBSTANCE: spinning solution for electrical formation of polymer precursor of fibres of siliconecarbide contains 50 - 70 % solution of polycarbosilane with average molecular weight of 800 - 1500 astronomical units of weight, cross-linking agent and photoinitiator at the following molar ration of components: polycarbosilane/cross-linking agent/photoinitiator = 1/(0.5-1.5)/(0.5-2). Method for obtaining silicone carbide fibres involves preparation of spinning solution, electrical forming of fibres of precursor of silicone carbide from spinning solution with simultaneous cross-link of precursor fibres by light irradiation in visible or UV radiation range and heat treatment of precursor fibres for their conversion to silicone carbide fibres. Silicone carbide fibres made in compliance with the above method have average diameter of 50 nm to 2 mcm and porosity of less than 10 m2/g.
EFFECT: invention provides high capacity and low cost of production of high-quality silicone carbide fibres characterised with high mechanical strength and low porosity.
6 cl, 1 tbl
SUBSTANCE: melt or solution is prepared first, where said melt or solution contains at least one substrate material or corresponding precursor compounds of substrate material and at least one thermoelectrically active material or a precursor compound of thermoelectrically active material. Further, the melt or solution undergoes electroformation. Fibre which contains at least one substrate material and at least one thermoelectrically active material and a precursor compound of thermoelectrically active material is obtained. If necessary, the precursor compound of the thermoelectrically active material is converted to active form. The thermoelectrically active material contains at least one compound which contains at least one element selected from a group consisting of tellurium and boron, or the thermoelectrically active material is selected from a group consisting of antimonides, silicides, germanides, skutterudites, clathrates, bismuth, NaCo2O4, Bi2-xPbxSr2Co2Oy, where x=0-0.6 and y=8+σ, rod-like monocrystals based on Cu-Co-O or Bi-Sr-Co-O, mixtures of oxides of formula SrTiOmSn (I), where 0≤n≤0.2 and 2≤m≤2.99, Ca2Co2O5, NaCo2O4, Ca2Co4O9 and their mixtures. Disclosed also is a method of producing nanotubes, nanowire and nanotubes, as well as use of nanowire and nanotubes in thermoelectric temperature control, for generating current, in sensors and for controlling temperature.
EFFECT: production of nanowire and nanotubes of sufficient length and constant quality, which enables high-precision temperature control.
12 cl, 3 ex
SUBSTANCE: inventions relate to method of producing nanofibres from polymer solution by method of electrostatic fibre formation in electric field, created due to difference of potentials between charged electrode and opposite electrode and device for its realisation. According to method polymer solution is supplied into electric field for electrostatic fibre formation by surface of rotating charged electrode, part of whose surface is submerged into polymer solution. Simultaneously formed nanofibres under impact of electric field are displaced from rotating charged electrode to opposite electrode and then are laid on means for their laying. Nanofibres are formed on cylindrical or quadrangular, or polygonal prismatic surface of charged electrode, and opposite electrode is placed opposite free part of charged electrode, air being sucked from space between charged electrode and opposite electrode. Device for method realisation contains rotating charged electrode and opposite electrode. Charged electrode represents cylinder or quadrangular or polygonal prism, and opposite electrode is placed opposite free part of charged electrode. Polymer solution for electrostatic fibre formation by surface of rotating charged electrode is supplied into created by electrodes electric field, simultaneously formed nanofibres under impact of electric field are displaced from rotating charged electrode to opposite electrode and then are directed to means of their laying, which represents air-permeable transporter. Means for laying nanofibres can be formed by flat carrying material of nanofibres.
EFFECT: increase of productivity of nanofibres production.
14 cl, 9 dwg