EP3414371A1 - Procédé pour produire des fibres polymères à partir de polymères dissouts dans des liquides ioniques au moyen d'un procédé de filage avec espace d'air - Google Patents

Procédé pour produire des fibres polymères à partir de polymères dissouts dans des liquides ioniques au moyen d'un procédé de filage avec espace d'air

Info

Publication number
EP3414371A1
EP3414371A1 EP17702113.6A EP17702113A EP3414371A1 EP 3414371 A1 EP3414371 A1 EP 3414371A1 EP 17702113 A EP17702113 A EP 17702113A EP 3414371 A1 EP3414371 A1 EP 3414371A1
Authority
EP
European Patent Office
Prior art keywords
fibers
polymer
spinning solution
solvent
ionic liquid
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP17702113.6A
Other languages
German (de)
English (en)
Inventor
Falko ABELS
Tomasz CWIK
Ronald BEYER
Frank Hermanutz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Technikum Laubholz GmbH TLH
Original Assignee
Deutsche Institute fuer Textil und Faserforschung Stuttgart
Deutsche Institute fuer Textil und Faserforschung Denkendorf DITF
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Deutsche Institute fuer Textil und Faserforschung Stuttgart, Deutsche Institute fuer Textil und Faserforschung Denkendorf DITF filed Critical Deutsche Institute fuer Textil und Faserforschung Stuttgart
Publication of EP3414371A1 publication Critical patent/EP3414371A1/fr
Pending legal-status Critical Current

Links

Classifications

    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D5/00—Formation of filaments, threads, or the like
    • D01D5/06—Wet spinning methods
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D1/00—Treatment of filament-forming or like material
    • D01D1/02—Preparation of spinning solutions
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F2/00—Monocomponent artificial filaments or the like of cellulose or cellulose derivatives; Manufacture thereof
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F2/00—Monocomponent artificial filaments or the like of cellulose or cellulose derivatives; Manufacture thereof
    • D01F2/02—Monocomponent artificial filaments or the like of cellulose or cellulose derivatives; Manufacture thereof from solutions of cellulose in acids, bases or salts

Definitions

  • the invention relates to a process for producing polymer fibers from polymers dissolved in ionic liquids by an air-gap spinning process, which is characterized in that a) a spinning solution containing an ionic liquid and a dissolved polymer is prepared, b) this spinning solution by an extruder is passed before it is cut into fibers via a nozzle and c) the resulting fibers are passed through an air gap through a coagulation bath.
  • the spinning solution containing the dissolved polymer is passed directly into a precipitation bath.
  • the polymer coagulates and the resulting fibers are spun directly from the precipitation bath.
  • the spinning solution In the dry-spinning process, the spinning solution is forced through a spinneret and then passed through a tempered air gap. In the air gap, the exiting jets of the spinning solution solidify into fibers.
  • a special form of the dry spinning process is the dry-wet spinning process.
  • the fibers obtained are passed, after passing through the air gap, into a coagulation bath containing a precipitating agent for the polymer. In this coagulation bath, the fibers solidify further.
  • Cellulose fibers are predominantly produced by the viscose process.
  • the resulting fibers are called viscose fibers.
  • pulp which has been obtained, for example, from wood by the force method is brought into solution by a chemical reaction.
  • alkali and carbon disulphide With the help of alkali and carbon disulphide, cellulose xanthate is obtained. This dissolves after addition of acid with elimination of carbon disulfide.
  • the methods described above are alternative methods to the viscose process. They have the principal advantage that carbon disulfide and carbon disulfide conversions can be dispensed with.
  • the performance properties of the cellulose fibers produced by means of the alternative processes correspond to or exceed those of the viscose fibers.
  • Such properties are in particular the strengths of the fiber, its elasticity, its modulus of elasticity.
  • the fibers obtained should be as uniform and homogeneous as possible, that is to say that as far as possible all fibers have the same properties.
  • the object of the present invention was therefore a process for the production of polymer fibers, in which polymer fibers having the best possible performance properties are obtained.
  • the process should be well suited for the production of cellulose fibers; the resulting cellulose fibers should at least achieve the performance properties of the viscose fiber and if possible exceed it.
  • the polymer fibers produced by the above method are preferably polymer fibers made from renewable raw materials. Preferably, it is cellulose fibers.
  • the ionic liquid is preferably salts which have a melting point of less than 100 ° C. under atmospheric pressure (1 bar). Particular preference is given to salts which are liquid at 21 ° C., 1 bar.
  • the term ionic liquid here also includes mixtures of different salts.
  • the ionic liquid is salts of an organic cation and an anion.
  • Suitable organic cations are, in particular, organic cations with heteroatoms, such as nitrogen, sulfur, oxygen or phosphorus.
  • the organic cations are compounds having an ammonium group (ammonium cations), an oxonium group (oxonium cations), a sulfonium group (sulfonium cations) or a phosphonium group ( Phosphonium cations).
  • the organic cations are ammonium cations, which here mean non-cyclic cations with tetrablocated nitrogen and localized positive charge on the nitrogen atom (quaternary ammonium compounds) or heterocyclic cations with at least one, preferably one to three, nitrogen atoms in the ring system become.
  • quaternary ammonium cations may be mentioned in particular those having three or four aliphatic substituents on the nitrogen atom.
  • Such aliphatic substituents are, in particular, C 1 - to C 12 -alkyl groups or C 1 - to C 12 -hydroxyalkyl groups.
  • Preferred organic cations having at least one nitrogen are organic, heterocyclic cations having one to three, in particular one or two, nitrogen atoms as constituent of the heterocyclic ring system.
  • Suitable compounds are monocyclic, bicydic, aromatic or nonaromatic ring systems.
  • bicydic systems Called e.g. bicydic systems, as described in WO 2008/043837.
  • the bicyclic systems of WO 2008/043837 are diazabicyclo derivatives, preferably from a 7- and a 6-ring, which contain an amidinium group; in particular the 1,8-diazabicyclo (5.4.0) undec-7-enium cation may be mentioned.
  • monocyclic cations such as pyridinium cations, pyridinylium cations, pyrimidinium cations, pyrazinium cations, imidazolium cations, pyrazolium cations, pyrazolinium cations, imidazolinium cations, thiazolium cations, triazine cations, pyrazolinium cations.
  • zolium cations, pyrrolidinium cations and imidazolidinium cations are e.g. in WO 2005/1 13702.
  • the nitrogen atoms are in each case by a hydrogen atom or an organic group having generally not more than 20 C atoms, preferably a hydrocarbon group, in particular a C 1 to C 16 alkyl group, in particular a C1 to C10, particularly preferably a C1 to C4 alkyl groups substituted.
  • R2, R3, R4 and R5 stand for an H atom or an organic radical having 1 to 20 C atoms.
  • R 1 and R 3 are preferably independently an organic radical having 1 to 10 C atoms.
  • R 1 and R 3 are an aliphatic radical, in particular an aliphatic radical without further heteroatoms, e.g. for an alkyl group.
  • R 1 and R 3 independently of one another are a C 1 to C 10 or a C 1 to C 4 alkyl group, very particularly preferably R 1 and R 3 independently of one another are a methyl group or an ethyl group.
  • the anion belonging to the organic cation may be any anion.
  • anions of the ionic liquids are preferably organic anions having at least one carboxylate group, termed carboxylates for short.
  • carboxylates Preferably, the carboxylates contain only one carboxylate group.
  • carboxylates are organic anions having 1 to 20 C atoms and a carboxylate group.
  • the carboxylates contain no further heteroatoms apart from the oxygen atoms of the carboxylate group.
  • Suitable carboxylates of the alkanecarboxylic acids, alkene carboxylic acids and alkadiene carboxylic acids are also known as fatty acid carboxylates.
  • carboxylates are C 1 - to C 20 -alkanoates (carboxylates of alkanecarboxylic acids), in particular C 1 - to C 16 -alkanoates. Mention may in particular be made of the carboxylates of formic acid (C1-carboxylic acid), acetic acid (C2-carboxylic acid), propionic acid (C3-carboxylic acid), n-butyric acid (C4-carboxylic acid), n-valeric acid (C5-carboxylic acid), n-caprolactone (C6 carboxylic acid) n-caprylic acid (C8 carboxylic acid, octanoic acid), n-capric acid (C10 carboxylic acid, decanoic acid), lauric acid (C12 carboxylic acid, dodecanoic acid), palmitic acid (C16 carboxylic acid, hexadecanoic acid) or stearic acid (C18 carboxylic acid (C18
  • the ionic liquids are therefore particularly preferably salts
  • ionic liquids may be mentioned preferably: 1-ethyl-3-methyl-imidazolium acetate,
  • a spinning solution is prepared which contains an ionic liquid and a dissolved polymer.
  • the polymer is preferably cellulose, see above for the polymer fibers.
  • the cellulose is obtained in particular from wood or other plant materials, mention may be made of wood such as beech, spruce, eucalyptus or pine or other plant materials such as bamboo, straw and grasses.
  • Cellulose is e.g. separated from the wood and other plant materials by the power process, and accumulates as so-called pulp, which is generally more than
  • the average degree of polymerization (DP) of the cellulose in the pulp may be e.g. from 200 to 2000.
  • the DP value indicates the average number of glucose units per cellulosic chain.
  • the average degree of polymerization of the cellulose can be reduced by breaking up the polymer chains.
  • dissolved cellulose can be exposed to elevated temperature and / or brought into contact with acids or bases.
  • the spinning solution prepared and used in the further process therefore preferably contains a dissolved cellulose having a DP 200 of up to 2000, particularly preferably from 300 to 1000 and very particularly preferably from 400 to 800.
  • the spinning solution contains as solvent the above ionic liquid.
  • the spinning solution may contain other solvents. These further solvents should preferably be miscible with the ionic liquid and be used only in amounts such that the solubility of the polymers, or of the cellulose, in the solution is not impaired.
  • polar, protic solvents such as methanol, ethanol or water in amounts of less than 10 parts by weight, in particular less than 3 parts by weight per 100 parts by weight of ionic liquid are suitable.
  • the content of other solvents in the spinning solution is less than 1 part by weight and in particular less than 0.1 parts by weight per 100 parts by weight of ionic liquid.
  • the content of the cellulose in the spinning solution is preferably 6 to 20 parts by weight, more preferably 10 to 14 parts by weight per 100 parts by weight of ionic liquid.
  • the spinning solution may contain other ingredients.
  • water can be used to adjust the flow behavior and / or flame retardant additives and / or pigments, in particular for coloring the fiber.
  • a preferred content of water is, for example, 0.1-5% by weight, based on the total spinning solution.
  • the content of pigments or active substances, such as stabilizers, for example antioxidants, antibacterial agents, UV inhibitors, etc. may be, for example, 0.1-2% by weight, based on the total spinning solution.
  • the spinning solution can be prepared by conventional methods.
  • cellulose can be mixed with the ionic liquid and brought into solution at elevated temperature.
  • the polymer or cellulose may optionally be mechanically comminuted beforehand, for example by a painting process, in order to simplify the dissolution process.
  • mechanical comminution it may be helpful to use swollen polymer or cellulose.
  • Suitable swelling agents are, in particular, the non-solvent described below.
  • the dissolution process is generally assisted by mechanical measures such as stirring.
  • the solution process can also be improved or accelerated by ultrasound. If the spinning solution is to contain further constituents, these may be e.g. be introduced together with the cellulose or subsequently.
  • the polymer or cellulose is dissolved in the ionic liquid using an auxiliary liquid which does not or only partially dissolves the polymer or cellulose (also referred to below as non-solvent).
  • the non-solvent is largely or completely removed during the dissolution process, preferably by distillation, and is then contained in the spinning solution only in the amounts of the other solvents specified above.
  • the non-solvent is preferably miscible with the ionic liquid.
  • the spinning solution in process step a) is therefore preferably obtained by
  • Suitable non-solvents for cellulose are in particular water and alkanols, preferably water and methanol, more preferably water.
  • the amount of non-solvent is preferably at least 30 parts by weight, more preferably at least 50, most preferably at least 80 parts by weight of non-solvent based on 100 parts by weight of polymer or cellulose.
  • the non-solvent can be used in large excess. However, since it is removed again, it is preferred more than 200 parts by weight, in particular not more than 150 parts by weight of non-solvent per 100 parts by weight of polymer.
  • ionic liquid is also used and a heterogeneous mixture is obtained which contains the cellulose, the non-solvent and the ionic liquid.
  • the total amount of the ionic liquid is used in a1) and a heterogeneous mixture is obtained which contains the cellulose, the non-solvent and the ionic liquid in the amounts indicated above.
  • the remainder may be e.g. be added during the removal of the non-solvent by distillation or may be added subsequently to the spinning solution.
  • the non-solvent is preferably distilled off at a temperature of 50 to 150 ° C, more preferably at a temperature of 80 to 130 ° C.
  • a thin-film evaporator is used in a particularly preferred embodiment. It may be e.g. to act a falling film evaporator or a rotor evaporator.
  • a rotor evaporator is a rotor evaporator.
  • This is generally a cylinder that contains a rotor inside.
  • the distance between the cylinder and the rotor is preferably at most 10 millimeters, more preferably at most 1 millimeter.
  • the cylinder is heated.
  • Rotor mounted mixing elements e.g. Wiper blades, ensure good mixing of the heterogeneous mixture during distillation.
  • the heterogeneous mixture obtained in a1) is preferably introduced at the upper end of the heated cylinder.
  • the heterogeneous mixture is distributed on the inner wall of the cylinder.
  • the non-solvent preferably water, evaporates and the cellulose goes into solution.
  • the resulting dope can be removed.
  • the discharge of the spinning solution can be done by conventional pumps, such as a gear pump.
  • the preparation of the solution can be carried out continuously and the spinning solution at the output can be continuously fed to the further spinning process.
  • a spinning solution is obtained which is free of gas bubbles and which has a very high homogeneity.
  • the thin film evaporator may e.g. be operated at a pressure of 40-80 millibar, a temperature of 80-130 ° C and a flow rate of 0.5-2kg / h heterogeneous mixture.
  • a larger throughput is possible.
  • the spinning solution obtained in a) is passed through an extruder.
  • the spinning solution obtained in a) is first filtered before being fed to the extruder. By the filtration undissolved components should be separated.
  • the filtration is carried out under pressure, in particular, a pressure filter vessel is suitable for carrying out the filtration.
  • the filtration is preferably carried out at a pressure of at least 1, 2, in particular at least 1, 5 bar. More than 3 bar are generally not necessary.
  • the spinning solution passes after process step a) and a preferably subsequent filtration directly into the extruder.
  • the extruder preferably consists essentially of an outer shell, generally in the form of a cylinder, and at least one auger inserted therein.
  • this is an extruder with one or two screws, in particular it is an extruder with a screw.
  • the channel depth can remain the same or change over the entire length of the snails.
  • the screws are core-progressive, that is, that the thread depth at the feeder is greater than the channel depth at the outlet of the extruder.
  • the ratio of the flight depth at the inlet to the outlet is 1.2: 1 to 3: 1, more preferably 1.5 to 1 to 2: 1.
  • Conventional screws with a screw diameter D of, for example, 5 to 500 millimeters can be used.
  • screw diameter D of 5 to 250 millimeters preferred; Particularly preferred are 5 to 50 millimeters and in particular a screw diameter D of 10 to 50 millimeters.
  • the length of the screws is usually given as a multiple of D.
  • Preferred screw lengths are 10 to 50 D, in particular 15 to 30 D.
  • the speed of the screws is preferably 10 to 300, more preferably 25 to 100 revolutions per minute.
  • the temperature of the spinning solution in the extruder is preferably 20 to 150 ° C, especially 40 to 120 ° C, most preferably 40-90 ° C.
  • the pressure at which the spinning solution is conveyed through the extruder can e.g. 10 to 200 bar, in particular 15 to 150 bar, very particularly preferably 20 to 120 bar.
  • the spinning solution After passing through the extruder, the spinning solution passes through a pump, e.g. a gear pump, to the spinning head.
  • the spinner head generally includes a final filtration device and a manifold block to distribute the spinning solution as evenly as possible over all the holes of the nozzle and the nozzle.
  • the spinning solution is divided into polymer fibers.
  • L / D ratio can be e.g. 2/1 to 8/1 amount.
  • the throughput of the spinning solution through the extruder depends on the number of holes of the nozzle and the pressure. At pressures of 15 to 150 bar and a number of holes of 168, the throughput may be, for example 3 to 20 cm 3 / min; for a nozzle with a number of holes of 1000, the throughput may be, for example, 17 to 1 19 cm 3 / min.
  • the spinning solution is divided into fibers.
  • the fibers initially consist of the spinning solution.
  • the exit speed of the spinning solution or the forming fibers from the nozzle is e.g. 2.5 to 40 m / min, preferably 4m / min to 30m / min, more preferably 5.5 to 20m / min.
  • the fibers obtained when passing through the nozzle are passed through an air gap through a coagulation bath.
  • the width of the air gap may be e.g. 5 mm (mm) to 50 mm. Preferably, the width of the air gap is 8 to 20 mm.
  • the fibers are preferably drawn. By stretching the fiber is extended and the polymer oriented simultaneously in the pulling direction.
  • Galettenduos are two rotating rollers, which are arranged one above the other. They serve as drives for the transmission of the fiber. Both rollers rotate at the same speed in the same direction and have the same diameter, moreover, they are generally not quite parallel to each other, but at a slight angle. This causes at several wraps of the fiber around both rollers a distance between the wraps. This prevents the fibers from touching and being mechanically damaged.
  • the stretching can therefore be effected in a simple manner by an increased transport speed of the godet duo. If this is higher than the exit speed of the fiber from the nozzle, the fiber is stretched directly after exiting the nozzle.
  • the degree of stretching results from the ratio of the transport speed of the godet duo to the exit speed of the fiber from the nozzle. Without stretching, i. at the same speeds, the degree of stretching results 1.
  • the degree of stretching is from 1.5 to 3.5, more preferably from 1.8 to 3.5.
  • the transport speed of the godet duo can e.g. 1 to 200 meters (m) / minute (min). Preferably, it is 15 to 40m / min.
  • the fibers enter the coagulation bath.
  • the coagulation bath contains a non-solvent for the polymer or for the cellulose. Non-solvents are described above. Preferred non-solvent is water.
  • the coagulation bath may also contain solvents that dissolve the polymer, eg, ionic liquid.
  • ionic liquid dissolves the polymer
  • the content of ionic liquid or other solvents which dissolve the polymer or cellulose should preferably be kept so low that the coagulation of the polymer is not significantly impaired.
  • the coagulation bath should particularly preferably contain not more than 30% by weight, very particularly preferably not more than 10% by weight, of such solvents. The percentages are based on the total weight of the coagulation bath.
  • the temperature of the coagulation bath is generally not increased, for example between 10 and 30 ° C.
  • the contact time of the fiber in the coagulation bath can, for. B.1 seconds to 60 seconds, preferably 5 to 20 seconds.
  • the fibers After passage through the coagulation bath, the fibers are substantially solidified in their structure and are hardly changed in their mechanical properties by the subsequent process steps, such as washing, equipment with additives, drying and winding.
  • the fiber passes through several wash baths, e.g. Water baths, so that the ionic liquid is removed as completely as possible from the fiber. This can be followed by baths to equip the fiber. These are e.g. to water baths containing conventional additives, eg. B Phosphorus compounds for fire protection equipment or surface treatment additives. The latter prevent a later sticking together of the rolled up fiber.
  • the drying can be carried out by heatable godet ducts and / or the supply of hot air in a heating channel. Finally, the fiber is wound up.
  • the fibers finally produced in process step c), which are also referred to as filaments, are so-called endless fibers or continuous filaments.
  • staple fibers these are not purposefully cut but obtained at the end of the production process as rolled-up fibers.
  • fibers e.g. Cellulose fibers
  • very good application properties e.g. Cellulose fibers
  • cellulose fibers with a defibrillation grade of 1 to 2.5 can be obtained with the method.
  • defibrillation refers to the formation or presence of fibrils, ie fine hairs, which protrude from the fiber; these fibrils are generally undesirable for textile applications because they make the fiber rough.
  • Defibrillation is assessed visually by a defibrillation note.
  • the fibers are added to water and shaken. The presence of protruding fibrils is then checked under the microscope. For grading grades from 1 to 6 are given. At grade 1 there are no fibrils (no defibrillation) at grade 6 the fiber is completely fibrillated.
  • the thickness of the cellulose fibers obtained is preferably 2-20 ⁇ ,
  • the fineness of the fiber i. Weight based on fiber length, is preferably 1 -4 dtex.
  • the unit tex stands for grams on 1000 meters of fiber; 1 dtex equals 0.1 tex or gram per 10000 meters of fiber.
  • the maximum tensile force of the fiber is in particular 10 to 100 cN / tex, particularly preferably 20 to 60 cN / tex.
  • EMIM octanoate 1-ethyl-, 3-methyl-imidazolium octanoate (R1 in formula I is ethyl and R3 in formula I is methyl), EMIM octanoate is an ionic liquid, hereinafter also referred to as IL for ionic liquid)
  • the characterization of the spinning solution is carried out by means of a rheometer.
  • Rheological investigations serve primarily to check the spinnability of a dope.
  • Important parameters here are the zero-shear viscosity, ie the theoretical viscosity at no load and the crossover, ie the point at which the loss and storage modulus are the same. Frequez sweep tests are performed to obtain these quantities.
  • the spinning solution should have pseudoplastic behavior and be no gel. Since spun over an air gap, the solution must have a sufficiently large elastic behavior to form stable filaments, but these filaments must also be stretched. Therefore, a sufficiently viscous behavior should be present.
  • the spinning solution had a zero shear viscosity of 1000 Pas at 110 ° C., or 20000 Pas at 50 ° C., and a crossover at about 16rad / s at 110 ° C.) or about 0, 8rad / s at 50 ° C. It also had up to 50 ° C pseudoplastic behavior.
  • These values were determined using a Rheometrics Dynamic Stress Rheometer SR 500.
  • the measuring head was a 25 mm diameter plate, which measured a force-controlled frequency sweep and the frequency range was from 100 to 0.1 rad / s for one force This measurement was carried out in each case at 1 10 ° C to 40 ° C in descending order in 10K increments The measuring gap was 1 mm. Processing of the spinning solution
  • the spinning solution was transferred to a "pressure filtration kettle 10 liter" from Karl Kurt Juchheim using a stainless steel austenitic steel fabric number 1.4401 with a mesh size of 0.043 mm and a wire gauge of 0.035 mm.
  • the filtration unit was placed on a rack over the extruder.
  • the pressure filter boiler was connected to the intake at the extruder with a heatable transport line.
  • the extruder was an extruder called Haake Polylab Rheocord.
  • the screw of the extruder was core progressive with a ratio of flight depths of 2 to 1, i.
  • the passage depth is twice as large at the feeder as at the outlet.
  • the diameter of the screw was 19mm, the length 25xDurchmesser, ie 475mm.
  • the dope was passed through the filter through 2bar pressure in the extruder. There she was transported by a screw to the spinning pump.
  • the spinning pump used was a Feinprüf- gear pump with a displacement of 0.6cm 3 / U.
  • the spinning solution was passed through the spinning head, where it was evenly distributed over another filter and a manifold block on the nozzle.
  • the nozzle used here has a hole diameter of 60 ⁇ with an L / D ratio of 2/1, has 168 holes and is from Enkatechnika. This complete setup from the pressure filtration to the nozzle was heated to the spinning temperature.
  • the emerging from the nozzle filaments were passed through an air gap of 10mm in a coagulation bath.
  • the coagulant contained water as a non-solvent.
  • the temperature of the coagulation bath was 21 ° C.
  • the fiber was deflected after an immersion depth of 300 mm and withdrawn from the coagulation bath via a pair of godets at a defined speed and transported on. Depending on the desired drawing and exit speed, the take-off speed varied according to the table.
  • a wet-spinning machine from Fourne was used. This comprises a total of 9 door duos.
  • the drying step was carried out on a heated galette duo at 80 ° C.
  • the fiber was then passed through a hot air duct at (1200mm, 120 ° C) and wound after the last pair of godets with a tension controlled Oeriklon Barmag winder type WUFF 6E.
  • the textile-mechanical properties were measured with a "Favimat” from the company Textechno and the average values were determined from 20 individual fiber measurements.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Artificial Filaments (AREA)

Abstract

L'invention concerne un procédé pour produire des fibres polymères à partir de polymères dissouts dans des liquides ioniques au moyen d'un procédé de filage avec espace d'air, caractérisé en ce que : a) une solution de filage renfermant un liquide ionique et un polymère dissout est produite; b) cette solution de filage est guidée à travers une extrudeuse avant d'être divisée en fibres par l'intermédiaire d'une filière, et c) les fibres obtenues sont guidées à travers un bain de coagulation après avoir traversé un espace d'air.
EP17702113.6A 2016-02-11 2017-02-01 Procédé pour produire des fibres polymères à partir de polymères dissouts dans des liquides ioniques au moyen d'un procédé de filage avec espace d'air Pending EP3414371A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP16155254 2016-02-11
PCT/EP2017/052078 WO2017137284A1 (fr) 2016-02-11 2017-02-01 Procédé pour produire des fibres polymères à partir de polymères dissouts dans des liquides ioniques au moyen d'un procédé de filage avec espace d'air

Publications (1)

Publication Number Publication Date
EP3414371A1 true EP3414371A1 (fr) 2018-12-19

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EP17702113.6A Pending EP3414371A1 (fr) 2016-02-11 2017-02-01 Procédé pour produire des fibres polymères à partir de polymères dissouts dans des liquides ioniques au moyen d'un procédé de filage avec espace d'air

Country Status (4)

Country Link
US (2) US11585015B2 (fr)
EP (1) EP3414371A1 (fr)
CA (1) CA3014253A1 (fr)
WO (1) WO2017137284A1 (fr)

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SE544547C2 (en) * 2019-02-21 2022-07-12 Treetotextile Ab A process for wet spinning of cellulose fibers from an alkaline spin bath

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US20190048490A1 (en) 2019-02-14

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