Method of manufacture of lignin-containing prediminary fiber, and also of carbon fibers

FIELD: chemistry.

SUBSTANCE: invention relates to a process for the production of lignin-containing precursor fibers for production of carbon fibers and/or activated carbon fibers, wherein: a) a solution containing at least one kind of lignin, as well as at least one fiber-forming polymer selected from the group consisting of cellulose or cellulose derivatives, at least one solvent selected from the group consisting of tertiary amine and/or ionic liquids b) transferred into a coagulation bath after extrusion of the solution spinning spinneret wet spinning method from a solution or spinning with an air gap, precipitating lignin precursor c) is stretched lignin precursor, at least 1.1 times, at a temperature of at least 60C, wherein lignin thread is an economical starting material for the production of activated carbon and carbon fibers. The invention also relates to a method for manufacturing carbon fiber.

EFFECT: increased productivity.

15 cl, 4 ex

 



 

Same patents:

FIELD: chemistry.

SUBSTANCE: method includes fractionating feed stock, steaming fractions with fourfold washing, first acid hydrolysis with threefold washing, second acid hydrolysis with threefold washing, third acid hydrolysis with threefold washing, first bleaching with threefold washing and second bleaching with fourfold washing.

EFFECT: improved quality of the end product and optimisation of the process.

1 ex

FIELD: chemistry.

SUBSTANCE: invention relates to chemical engineering of fibre materials and to fluorescent fibre, use thereof and methods for production thereof. Reclaimed cellulose fibre contains red pigment inclusions and a fluorescent dye deposited by subsequent colouring. The fibre satisfies EN 471 standards with respect to luminance factor, chromaticity coordinates and colour fastness, and is also characterised by light fastness greater than 5, measured according to ISO 105-B02, method 2.

EFFECT: invention enables to obtain fibre for use in protective clothes and clothes with reflecting properties, which satisfies the requirement for background materials in accordance with the EN 471 standard.

11 cl, 2 tbl, 2 ex

FIELD: process engineering.

SUBSTANCE: invention relates to production of fibres from reproducible stock, particularly, from cellulose and to device to this end. This method consists in mixing said reproducible stock with solvent to get spin dope. Then, solvent is removed, at least partially, from said mix to feed spin dope to spinning device. Spin dope is diluted with solvent before spinning. Proposed device comprises mixing reactor and spin dope spinner and mixer arranged there between to decreased spin dope viscosity.

EFFECT: higher efficiency of propose process.

26 cl, 1 dwg

FIELD: biotechnologies.

SUBSTANCE: method includes vegetable material fractionation, fraction autoclave treatment with three times washing-off, the first acid hydrolysis with three times washing-off, alkaline hydrolysis with three times washing-off, the second acid hydrolysis with three times washing-off, the first bleaching with three times washing-off; the second bleaching with four times washing-off. Additional homogenisation stage is possible.

EFFECT: according to invention the method does not require the use of expensive equipment, does not propose the use of high-toxic reagents, includes not complicated process operations, differs by the production volume.

2 cl

FIELD: chemistry.

SUBSTANCE: invention involves fractionating plant material, steaming the fraction, acid hydrolysis, first and second alkaline hydrolysis and bleaching.

EFFECT: process is characterised by favourable conditions for processing material while maintaining structural homogeneity of the end substance, does not require high power consumption and other production expenses.

3 cl

FIELD: textiles, paper.

SUBSTANCE: cellulosic moulded product is proposed with a cellulosic matrix and dispersed therein inclusions of non-polar organic compound(s) which comprises at least one hydrophobic agent increasing viscosity and/or in which the inclusions are surrounded by plain and/or elongated hydrophobisated nanoparticles as the barrier material. A method is also proposed of production of such products by wet-dry extrusion process and their applications as paper or film.

EFFECT: proposed moulded products as compared to unmodified cellulosic fibers have significantly higher ability to accumulate heat or nonpolar active agents, and can be used in the textile industry.

27 cl, 2 dwg

FIELD: medicine.

SUBSTANCE: method for making a support structure (14) involves making a hollow mould, cultivating cellulose-forming organisms in the internal space for the purpose of promoting the support structure growth in the internal space, and extracting from the hollow mould. The hollow mould comprises an external mould, and at least one core (2, 3, 4, 5) and at least a portion (2, 3, 4) of the hollow mould is irreversibly deformed at the stage of extracting from the hollow mould.

EFFECT: invention enables simplifying the method for making the cellulose support structure.

12 cl, 5 dwg

FIELD: chemistry.

SUBSTANCE: invention pertains to a particle comprising a composition containing a matrix and a peroxide or azo radical initiator, as well as rubber-coated products, tyres, tyre treads and belts containing particle-elastomer systems. The particle is selected from aramid, polyester, polyamide, cellulose fibre and glass fibre. The matrix is selected from an extruded polymer, wax or mixture thereof.

EFFECT: invention improved mechanical properties - modulus of elasticity, hardness and wear-resistance.

20 cl, 37 tbl, 7 ex

FIELD: chemistry.

SUBSTANCE: first, a microscopically homogenised solution is obtained by dispersing 75-25 vol. % cellulose and 25-75 vol. % of at least another fibre-forming polymer in a water-containing ionic liquid while adding stabilisers and completely removing water using shear, temperature and vacuum. The solution is formed through at least one die hole into a fibre or bundle of fibres, which is directed through a conditioned gap while drawing in order to deposit directed jets of the solution via treatment with a temperature-controlled solution of a precipitation agent for cellulose and another fibre-forming polymer, mixed with an ionic liquid so that spinodal layering takes place. The directed jets of the solution are removed from the settling bath and undergo subsequent treatment.

EFFECT: obtained fibre has low swelling capacity and high resistance to wet wearing.

10 cl, 6 tbl, 4 ex

FIELD: chemistry.

SUBSTANCE: invention relates to a method of controlling content of alpha cellulose in viscose during production of hydrated cellulose fibre, threads and films. Content of alpha cellulose in viscose is controlled by changing the volume of carbon sulphide dosages dissolved in an alkali and softening water depending on content of alpha cellulose in the alkaline cellulose.

EFFECT: method increases accuracy of determining content of alpha cellulose in alkaline cellulose and accuracy of controlling content of alpha cellulose in viscose.

7 dwg, 2 tbl, 2 ex

FIELD: textiles, paper.

SUBSTANCE: invention relates to a trough of spinning bath containing a trough for receiving liquid of the spinning bath, at least one roller provided inside the trough for guiding the spun fibres, and a system for supplying and draining the liquid for the spinning bath. According to the invention, it is provided that the trough (SBW) of the spinning bath has a structure which is used for wet spinning through the spinning nozzle (SD) located inside the liquid (SBF) of the spinning bath, and for dry/wet spinning through the spinning nozzle (SD) located above the liquid (SBF) of the spinning bath.

EFFECT: enhancement of the technological capabilities.

4 cl, 4 dwg

FIELD: chemistry.

SUBSTANCE: method includes extrusion of, at least, 15 wt % acidic acid of aromatic polyamide through linearly located draw plate holes; passing thread the base through layer of non-coagulating flow medium into coagulating bath; passing thread cloth through spinning tube, injection of additional coagulating liquid near threads downward at angle from 15 to 75 with respect to threads at constant rate, constituting approximately 50-100% of the rate of threads, movement of supplied coagulating liquid down together with the base of threads through spinning tube into coagulating bath. Tube has elongated transverse section and contains, at least, two opposite sides, parallel to the base of threads, with the length of the sides being, at least, equal to the width of the base of threads. Coagulating liquid is injected through injector channel from any one side of spinning tube, parallel to the base of threads, where injector channel has, at least, the same width as the base of threads.

EFFECT: invention relates to technology of production of synthetic fibres, in particular, to production of multitude of highly strong, high-modulus threads from aromatic polyamide.

6 cl, 3 tbl, 3 ex

FIELD: chemistry.

SUBSTANCE: first, a microscopically homogenised solution is obtained by dispersing 75-25 vol. % cellulose and 25-75 vol. % of at least another fibre-forming polymer in a water-containing ionic liquid while adding stabilisers and completely removing water using shear, temperature and vacuum. The solution is formed through at least one die hole into a fibre or bundle of fibres, which is directed through a conditioned gap while drawing in order to deposit directed jets of the solution via treatment with a temperature-controlled solution of a precipitation agent for cellulose and another fibre-forming polymer, mixed with an ionic liquid so that spinodal layering takes place. The directed jets of the solution are removed from the settling bath and undergo subsequent treatment.

EFFECT: obtained fibre has low swelling capacity and high resistance to wet wearing.

10 cl, 6 tbl, 4 ex

FIELD: chemistry.

SUBSTANCE: fibre is obtained via wet spinning of a solution which contains poly-meta-phenyleneisophthalamide as the main component, and an amide solvent containing a salt in settling bath. The water coagulation bath contains 40-60% amide solvent and 0.3-10% salt. The obtained porous fibre is stretched 1.5-10 times in a stretch bath with aqueous 20-70% solution of amide solvent at 20-70C and then washed with water. The fibre then undergoes thermal treatment in an atmosphere of saturated vapour at 0.02-0.5 MPa with stretch ratio of 0.7-5.0 and then undergoes dry thermal treatment at 250-400C with stretch ratio of 0.7-4.0. The ready fibre contains 1.0% or residual solvent, a small amount of volatile substance which is dangerous at the step for thermal treatment at high temperature, and capable of preventing dyeing of the product made from the fibre. The degree of dry thermal setting at 300C is equal to or less than 1.6% and breaking strength is equal to or more than 3.0 cN/decitex.

EFFECT: excellent high-temperature processability.

11 cl, 1 tbl, 6 ex

FIELD: chemistry.

SUBSTANCE: invention relates to a method of obtaining polysaccharide fibre for making materials, specifically for making surgical suture materials absorbable in a human and a mammal body, absorbable and non-absorbable dressing material and absorbable textile matrix materials. The method is characterised by that 2.4-4.0 wt % solution of polysaccharide in dimethylacetamide which contains 4.56-10.00 wt % lithium chloride is mixed with 1.0-5.0 wt % poly-N-vinylpyrrolidone with molecular weight of 8-35 kDa or a metallopolymer complex - fine-grained silver stabilised by poly-N-vinylpyrrolidone in such an amount that, content of fine-grained silver relative polysaccharide dissolved in spinning solution ranges from 0.07 to 0.87 wt %. Mass ratio of polysaccharide: metallopolymer complex equals 88.0-99.0:1.0-12 wt %. The mixture is intensely stirred, held, filtered, degassed and the obtained spinning solution is extruded at room temperature into an alcohol deposition tank in form of water-soluble aliphatic C2 and C3 alcohols. The fibre is then processed in plastification and washing tanks and dried.

EFFECT: obtaining fibre with good deformation and strength properties.

1 dwg, 4 tbl, 29 ex

FIELD: process engineering.

SUBSTANCE: proposed method comprises preparing spinning solution during production of polymer consisting only of aromatic polyamide, aromatic diamine, aromatic diatomic chloride and polymerisation solution fed into reactor (20), mixing them by mixer arranged inside reactor (20). Said mixer consists of rotor (3) driven by motor (2) and comprising multiple pins (3a); and stator (4) with multiple pins (4a). Note that rotor rpm is adjusted to vary from 10-fold to 100-fold rate of feed of aromatic diatomic chloride and aromatic diamine in polymerisation solution into reactor (20). Uniform and homogeneous polymerisation are effected over the entire space of polymerisation reactor (20) that results in reduction of deviances in polymerisation degree, since polymer monomers are mixed together to produce their good interaction directly after introducing them into reactor (20). Now the solution is forced through spinnerets.

EFFECT: higher strength of thread and higher modulus.

4 cl, 2 dwg, 1 tbl, 4 ex

FIELD: textile, paper.

SUBSTANCE: method is provided for receiving of cellulose filament, consisting of ultrafine filaments and used at manufacturing of filter fabric for filtration of blood and its components against white blood cells. According to the method it is implemented extrusion of spinning solution, stretch extraction of nascent yarn, post reduction, washing, drying and acceptance of filament. Extrusion is implemented at effluence rate of spinning solution 14.1 19.0 m/min and extrusion 7.4 39.0 % with receiving of filament, consisting of ultrafine filaments of linear density less than 0.039 tex. Squeezed after washing filaments with zero twist are formed into total tow of linear density 5.5 7.2 ktex, it is dried up to humidity 20 50% and is accepted in the form of flat tape into receiver tank. In the implementation version squeezed after washing single parallel oriented with zero twist are dried up to humidity 6 19 %, it is formed into total tow of linear density 5.5 7.2 ktex, it is embossed and accepted in the form of three-dimensional tow. Washing of filaments is implemented by countercurrent in three stages by soften water.

EFFECT: obtaining filament of linear density less than 0,039 tex, which can be used for formation of filter fabric with high performance attributes, providing increased effectiveness of blood cleaning up to 99,7%, and absence of filament twist provides simplification of its processing at manufacturing of filter fabric.

4 cl, 3 ex, 1 tbl

FIELD: textile and chemical industry, in particular, noise-absorbing guard for textile machines.

SUBSTANCE: unit for producing of high-strength viscose cord has mechanism for blocked lifting of encapsulation shield and forced drawing ventilation valve, air duct for forced drawing ventilation equipped with valve, air duct for removal of air-vapor mixture from first plasticizing bath pipes, encapsulation shield positioned at side where thread is formed, transverse and longitudinal partitions, thread forming set of equipment, air duct of permanently functioning drawing ventilation system and encapsulating shield positioned at side where drawing, collecting and transportation of thread are performed. Each of encapsulation shields has carcass formed as parallelepiped defined by front and rear walls of panel, each made U-shaped. There is slit-type perforation on front wall, with perforation coefficient being accepted equal to or exceeding 0.25. Panel walls are fixed with respect to one another by means of vibration damping covers. Noise-absorbing material of noise-damping members is made in the form of plate made from basalt-base mineral wool, or mineral wool, or basal wool, or glass wool with glass wool facing, or foamed polymer such as polyethylene or polypropylene. Noise-absorbing member is faced over its entire surface with acoustically transmitting material.

EFFECT: increased efficiency in reducing of noise level and increased efficiency of unit.

8 cl, 3 dwg

FIELD: textile and chemical industry, in particular, noise absorbing guards for spinning machines.

SUBSTANCE: spinning machine for staple viscose textile fiber comprises two single-sided spinning machines with sections at each side, and has set of fiber forming equipment, encapsulating shield, mechanism for blocked lifting of shield and enhanced suction valve, enhanced suction air tube, valve with hydraulic gate, and permanent suction air duct. Internal vibration isolation system for spinning machine has flexible members made from solid elastomer or wood. Vibration isolation system for frame of machine has flexible members extending along edge of machine to join said frame with foundation block. Rigidity of internal isolation flexible members of machine exceeds by 3-5 times the rigidity of flexible members joining machine frame to foundation block.

EFFECT: increased efficiency in reducing of noise volume and increased capacity of spinning machine.

4 cl, 3 dwg

FIELD: textile and chemical industry, in particular, noise absorbing guards for spinning machines.

SUBSTANCE: spinning machine for viscose textile threads comprises set of spinning equipment, space formed under capsule, encapsulating shields, permanent and enhanced suction air pipes. Each of encapsulation shields has carcass formed as parallelepiped defined by front and rear panel walls, each of which being made U-shaped. Slit-type perforation is provided on front wall, with perforation coefficient being accepted as equal to or exceeding 0.25. Panel walls are secured to one another by means of vibration damping covers. Sound absorbing material of sound absorbing member is made in the form of plate from basalt-base mineral wool, or mineral wool, or basalt wool, or glass wool faced with glass felt, or foamed polymer such as polyethylene or polypropylene. Sound absorbing member is faced over the entire surface thereof with acoustically transmitting material.

EFFECT: increased sound volume reducing efficiency and enhanced capacity of spinning machine.

4 cl, 3 dwg

FIELD: chemical industry; method of production of extruded cellulose continuously molded bodies.

SUBSTANCE: the invention presents a method of production of extruded cellulose continuously molded bodies from a spinning solution consisting of cellulose, water and tertiary aminoxide. To improve textile properties of extruded continuous molded bodies, as compared with existing level of engineering, the invention provides, that between an extrusion aperture of the die and the product removal device the continuous molded body is transported by a conveyor practically without stretching. At that it is preferable, that the speed of the intermediate conveyor motion should be less than the speed of extrusion and the speed of the product removal device. Due to these measures it is possible to improve considerably such textile properties as strength in a loop and a tendency to fibrillation.

EFFECT: the invention ensures improvement of textile property of extruded continuously molded bodies such as strength in a loop and a tendency to fibrillation.

34 cl, 5 dwg

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