KR101765791B1

KR101765791B1 - Method for manufacturing polyketone fiber using disk filter

Info

Publication number: KR101765791B1
Application number: KR1020150074178A
Authority: KR
Inventors: 최영민; 이득진
Original assignee: 주식회사 효성
Priority date: 2015-05-27
Filing date: 2015-05-27
Publication date: 2017-08-07
Also published as: KR20160139449A

Abstract

The present invention relates to a method for producing polyketone fibers using a disc filter, and more particularly, to a method for manufacturing polyketone fibers by using a disc filter to remove impurities by filtering the polyketone solution through a disc filter, To a process for producing such a polyketone fiber.

Description

TECHNICAL FIELD [0001] The present invention relates to a method of manufacturing a polyketone fiber using a disc filter,

It is a known fact that olefins such as carbon monoxide and ethylene and propylene are polymerized by using a transition metal complex such as palladium or nickel as a catalyst to obtain a polyketone in which carbon monoxide and olefin alternate.

Polyketone is preferably thermally crosslinked when it melts, so it is preferable to use wet spinning in the case of fiberization. Particularly, polyketone (poly (1-oxotrimethylene)) fibers having substantially excellent physical properties and substantially containing only carbon monoxide and ethylene are apt to undergo thermal crosslinking. Thus, the fibers are very difficult to produce by melt spinning and can only be obtained substantially by wet spinning.

When the polyketone is wet-spun, examples of the solvent to be used include hexafluoroisopropanol and an organic solvent such as m-cresol, phenolic solvent such as resorcinol / water, and resorcinol / carbonate 2-112413, 4-228613, and 7-508317). However, the fibers obtained by wet spinning using such a solvent tend to be easily dispersed, and fatigue resistance and workability are insufficient for use as an industrial material. In addition, such a solvent has high toxicity and flammability, and there is a problem that a large measure against the toxicity and flammability of a solvent is required to make a spinning facility of an industrial scale.

Further, a method of radiating using a polyketone solution prepared by dissolving a polyketone in an aqueous solution containing zinc chloride at a specific concentration, zinc halide such as zinc bromide, or lithium salt such as lithium chloride, lithium iodide and lithium thiocyanate (WO99 / 18143, USP5955019). These aqueous solutions are relatively inexpensive, have low toxicity and are non-flammable and are excellent as polyketone solvents.

Prior to spinning the polyketone solution prepared by dissolving the polyketone in the aqueous solution as described above, conventionally, the polyketone solution was filtered through a candle filter to remove impurities. However, when the above-mentioned candle filter is used, there is a problem that the flow stagnates toward the upper part of the filter and gelation occurs during a long operation.

In order to solve the problems described above, the present invention provides a method for producing polyketone fibers, which is capable of continuous flow of the spinning liquid and stable operation by removing the impurities by filtering the polyketone solution through a disk filter .

In order to accomplish the above object, the present invention provides a method for producing a polyketone solution, comprising: injecting and dissolving a metal salt aqueous solution and a polyketone into an extruder to prepare a polyketone solution; Filtering the polyketone solution through a disk filter to remove impurities; And a step of preparing a polyketone fiber by a spinning process, a washing process, a drying process, and a stretching process.

Wherein the polyketone comprises a Group 9, 10 or 11 transition metal compound, a ligand comprising an element of Group 15 and an anion of an acid having a pKa of 4 or less; And a method in which carbon monoxide and an ethylenically unsaturated compound are polymerized in the presence of a mixed solvent.

The drying step is preferably hot-rolled at 100 ° C to 230 ° C and preferably 1.0 to 2.0 times.

In addition, it is preferable that the stretching process is a method of passing through a heating chamber of 230 ° C to 300 ° C.

Further, it is preferable to treat the heat stabilizer before drying and before stretching.

The present invention improves the flowability of the spinning liquid due to the uniform pressure distribution by filtering the polyketone solution through the disk filter to remove the impurities, thereby improving the life of the filter due to optimization of the filtration process, It is possible.

1 is a view schematically showing a candle filter according to the prior art.
2 is a schematic view of a disk filter according to the present invention.
3 is a view schematically showing an upper end portion of the candle filter and the disk filter.
4 is a schematic view showing the role of the heat-resistant stabilizer according to the prior art.
5 is a schematic view of a conventional hot air drying type dryer.
6 is a schematic view of a hot-roll drying method according to the present invention.
Fig. 7 is a cross-sectional view of a dry irradiation method according to a conventional hot air drying method.
Fig. 8 is a cross-sectional view of a dry irradiation according to the hot-rolling method of the present invention.
9 is a view schematically showing a disk filter according to the present invention.

Hereinafter, the present invention will be described.

The present invention relates to a method for producing a polyketone solution, which comprises injecting and dissolving a metal salt aqueous solution and a polyketone into an extruder to prepare a polyketone solution; Filtering the polyketone solution through a disk filter to remove impurities; And a step of preparing a polyketone fiber by a spinning process, a washing process, a drying process, and a stretching process.

Wherein the polyketone comprises a Group 9, 10 or 11 transition metal compound, a ligand comprising an element of Group 15 and an anion of an acid having a pKa of 4 or less; But are not limited to, those obtained by polymerizing carbon monoxide and an ethylenically unsaturated compound in the presence of a mixed solvent.

In addition, it is preferable to stretch 1.0 to 2.0 times in the washing step and 1.0 to 2.0 times in the drying step, but the present invention is not limited thereto.

In addition, the drying step is hot-rolled at 100 to 230 ° C, and the stretching step is preferably a heating chamber stretching method at 230 to 300 ° C, but is not limited thereto.

In addition, it is preferable to treat the heat stabilizer before the drying step and the drawing step, but the present invention is not limited thereto.

Hereinafter, the polymerization method of the polyketone used in the present invention will be described in detail.

One or more olefinically unsaturated compounds (simply referred to as " A "), wherein the monomer units are alternating, and thus the polymer is composed of units of the formula - (CO) -A'- wherein A 'represents the monomer units derived from the applied monomer A ) And a high molecular weight linear polymer of carbon monoxide can be prepared by contacting monomers with a solution of a palladium-containing catalyst composition in a dilute solution in which the polymer does not dissolve or actually dissolve. During the polymerization process, the polymer is obtained in the form of a suspension in a diluent. The polymer preparation is carried out primarily batchwise.

The batchwise preparation of the polymer is typically carried out by introducing the catalyst into a reactor containing the diluent and the monomer and having the desired temperature and pressure. As the polymerization proceeds, the pressure drops, the concentration of the polymer in the diluent increases, and the viscosity of the suspension increases. The polymerization is continued until the viscosity of the suspension reaches a high value, for example, to the point where difficulties associated with heat removal occur. During batch polymer preparation, monomers can be added to the reactor during polymerization, if desired, to maintain the temperature as well as the pressure constant.

In the present invention, not only methanol, dichloromethane or nitromethane, which has been conventionally used for producing polyketones, but also mixed solvents comprising acetic acid and water, ethanol, propanol, and isopropanol can be used as the liquid medium. Particularly, when a mixed solvent of acetic acid and water is used as a liquid medium in the production of polyketone, the catalyst activity can be improved while reducing the production cost of polyketone. Further, since the use of methanol or a dichloromethane solvent forms a mechanism for causing a stopping reaction during the polymerization step, the use of acetic acid or water other than methanol or dichloromethane in the solvent does not have an effect of stopping the catalytic activity stochastically, It plays a big role in improvement.

When a mixed solvent of acetic acid and water is used as a liquid medium, when the concentration of water is less than 10% by volume, the effect of the catalyst is less affected. When the concentration of water is 10% by volume or more, the catalytic activity increases sharply. On the other hand, when the concentration of water exceeds 30% by volume, the catalytic activity tends to decrease. In the present invention, it is preferable to use a mixed solvent comprising 70 to 90% by volume of acetic acid and 30 to 10% by volume of water as the liquid medium.

In the present invention, the organometallic complex catalyst comprises (a) a Group 9, Group 10 or Group 11 transition metal compound of the Periodic Table of the Elements (IUPAC Inorganic Chemical Nomenclature Revised Edition, 1989), (b) And (c) an anion of an acid having a pKa of 4 or less.

Examples of the Group 9 transition metal compound in the ninth, tenth, or eleventh group transition metal compound (a) include complexes of cobalt or ruthenium, carbonates, phosphates, carbamates, and sulfonates, Specific examples thereof include cobalt acetate, cobalt acetylacetate, ruthenium acetate, ruthenium trifluoroacetate, ruthenium acetylacetate and ruthenium trifluoromethanesulfonate.

Examples of the Group 10 transition metal compounds include complexes of nickel or palladium, carbonates, phosphates, carbamates, and sulfonates. Specific examples thereof include nickel acetate, nickel acetyl acetate, palladium acetate, palladium trifluoroacetate , Palladium acetylacetate, palladium chloride, bis (N, N-diethylcarbamate) bis (diethylamine) palladium and palladium sulfate.

Examples of the Group 11 transition metal compound include a complex of copper and silver, a carbonate, a phosphate, a carbamate, and a sulfonate, and specific examples thereof include copper acetate, copper trifluoroacetate, copper acetylacetate, Examples of the trifluoroacetic acid include silver acetyl acetate, trifluoromethanesulfonic acid and the like.

Of these, transition metal compounds (a), which are inexpensive and economically preferable, are nickel and copper compounds, and preferable transition metal compounds (a) in terms of yield and molecular weight of polyketones are palladium compounds, It is most preferable to use palladium acetate.

Examples of ligands (b) having a Group 15 atom include 2,2-bipyridyl, 4,4-dimethyl-2,2-bipyridyl, 2,2- (Diphenylphosphino) propane, 1,4-bis (diphenylphosphino) butane, 1,3-bis (diphenylphosphino) Bis [di (2-methylphenyl) phosphino] propane, 1,3-bis [di (2-isopropyl) Bis (diphenylphosphino) cyclohexane, 1,2-bis (diphenylphosphino) phosphine, ) Benzene, 1,2-bis [(diphenylphosphino) methyl] benzene, 1,2-bis [[di (2-methoxyphenyl) Bis (diphenylphosphino) ferrocene, 2-hydroxy-1,3-bis [di (2-methoxyphenyl) ) Phosphino] propane, 2,2-dimethyl-1,3-bis [di (2-methoxyphenyl) Phosphino] propane, and the like.

Among these ligands, preferred ligands (b) having a Group 15 element are phosphorus ligands having an atom of Group 15, and particularly preferred ligands in terms of yield of polyketone are 1,3-bis [di (2- Methoxyphenyl) phosphino] propane and 1,2-bis [[di (2-methoxyphenyl) phosphino] methyl] benzene, Di (2-methoxyphenyl) phosphino] propane, and it is safe in that it does not require an organic solvent. Soluble sodium salts such as 1,3-bis [di (2-methoxy-4-sulfonic acid sodium-phenyl) phosphino] propane, 1,2- ] Methyl] benzene, and 1,3-bis (diphenylphosphino) propane and 1,4-bis (diphenylphosphino) butane are preferred for ease of synthesis and availability in large quantities and economically.

The ligand (b) having a group 15 atom preferred in the present invention, which focuses on the intrinsic viscosity and catalytic activity of the polyketone, is 1,3-bis- [di (2-methoxyphenyl) Bis (bis (methylene)) bis (bis (2-methoxyphenyl) phosphine), and more preferably 1,3-bis Bis (methylene)) bis (bis (2-methoxyphenyl) phosphino] propane or ((2,2-dimethyl-1,3-dioxane-5,5- ) Phosphine) is better.

Bis (bis (2-methoxyphenyl) phosphine) bis ((2,2-dimethyl-1,3-dioxane-5,5-diyl) bis Activity equivalent to that of 3,3-bis- [bis- (2-methoxyphenyl) phosphanylmethyl] -1,5-dioxa-spiro [5,5] undecane, which is known to exhibit the highest activity among polymerization catalysts The structure is simpler and has a lower molecular weight. As a result, the present invention has been able to provide a novel polyketone polymerization catalyst having the highest activity as a polyketone polymerization catalyst of the present invention, while further reducing its manufacturing cost and cost. A method for producing a ligand for a polyketone polymerization catalyst is as follows. ((2,2-dimethyl) -2,3-dioxolane was obtained by using bis (2-methoxyphenyl) phosphine, 5,5-bis (bromomethyl) Bis (bis (methylene)) bis (bis (2-methoxyphenyl) phosphine) is obtained by reacting a bis (methylene) . The process for preparing a ligand for a polyketone polymerization catalyst according to the present invention is a process for producing a ligand for a polyketone polymerization catalyst which comprises reacting 3,3-bis- [bis- (2-methoxyphenyl) phosphanylmethyl] -1,5-dioxa-spiro [5,5] ((2,2-dimethyl-1,3-dioxane-5,5-diyl) bis (methylene)) bis (bis (2- Methoxyphenyl) phosphine) can be commercially synthesized in a large amount.

In a preferred embodiment, the process for preparing a ligand for a polyketone polymerization catalyst of the present invention comprises: (a) introducing bis (2-methoxyphenyl) phosphine and dimethylsulfoxide (DMSO) into a reaction vessel under nitrogen atmosphere, Adding sodium and stirring; (b) adding 5,5-bis (bromomethyl) -2,2-dimethyl-1,3-dioxane and dimethylsulfoxide to the resulting mixture, followed by stirring and reacting; (c) adding methanol and stirring after completion of the reaction; (d) adding toluene and water, separating the layers, washing the oil layer with water, drying with anhydrous sodium sulfate, filtering under reduced pressure, and concentrating under reduced pressure; And (e) the residue was recrystallized from methanol to obtain ((2,2-dimethyl-1,3-dioxane-5,5- diyl) bis (methylene)) bis (bis (2- methoxyphenyl) And a step of acquiring the image data.

The amount of the Group 9, Group 10 or Group 11 transition metal compound (a) varies depending on the kind of the ethylenically unsaturated compound to be selected and other polymerization conditions. But is usually 0.01 to 100 mmol, preferably 0.01 to 10 mmol, per liter of the reaction volume of the reaction zone. The capacity of the reaction zone means the liquid phase capacity of the reactor.

Examples of the anion (c) of the acid having a pKa of 4 or less include an anion of an organic acid having a pKa of 4 or less, such as trifluoroacetic acid, trifluoromethanesulfonic acid, p-toluenesulfonic acid, or m-toluenesulfonic acid; Anions of inorganic acids having a pKa of 4 or less such as perchloric acid, sulfuric acid, nitric acid, phosphoric acid, heteropoly acid, tetrafluoroboric acid, hexafluorophosphoric acid, and fluorosilicic acid; And anions of boron compounds such as trispentafluorophenylborane, trisphenylcarbenium tetrakis (pentafluorophenyl) borate, and N, N-dimethylarinium tetrakis (pentafluorophenyl) borate.

In particular, the anion (c) of the acid having a pKa of 4 or less, which is preferred in the present invention, is p-toluenesulfonic acid. When used together with a mixed solvent of acetic acid and water as a liquid medium, It is possible to prepare a polyketone having a functional group

The molar ratio of (a) the ninth, tenth or eleventh group transition metal compound and (b) the ligand having an element of Group 15 element is 0.1 to 20 moles of the Group 15 element of the ligand per 1 mole of the palladium element, Is preferably added in a proportion of 0.1 to 10 moles, more preferably 0.1 to 5 moles. When the ligand is added in an amount of less than 0.1 mole based on the palladium element, the binding force between the ligand and the transition metal decreases, accelerating the desorption of the palladium during the reaction, and causing the reaction to terminate quickly. When the ligand exceeds 20 moles When added, the ligand is shielded from the polymerization reaction by the organometallic complex catalyst, so that the reaction rate is remarkably lowered.

The molar ratio of (a) the anion of the ninth, tenth or eleventh group transition metal compound and (c) the anion of the acid having a pKa of 4 or less is 0.1 to 20 mol, preferably 0.1 to 10 mol, Mol, and more preferably 0.1 to 5 mol. When the acid is added in an amount of less than 0.1 mol based on the palladium element, the effect of improving the intrinsic viscosity of the polyketone is unsatisfactory. If the acid is added in an amount exceeding 20 mol based on the palladium element, the catalytic activity for producing the polyketone tends to be rather reduced. not.

In the present invention, the reaction gas to be reacted with the catalyst for producing polyketone is preferably a mixture of carbon monoxide and an ethylenically unsaturated compound.

Examples of the ethylenically unsaturated compound copolymerized with carbon monoxide in the present invention include ethylene, propylene, 1-butene, 1-hexene, 4-methyl-1-pentene, - C2 to C20 alpha-olefins including tetradecene, 1-hexadecene, vinylcyclohexane; Styrene, C2-C20 alkenyl aromatic compounds including? -Methylstyrene; But are not limited to, cyclopentene, norbornene, 5-methylnorbornene, 5-phenylnorbornene, tetracyclododecene, tricyclododecene, tricyclo undecene, pentacyclopentadecene, pentacyclohexadecene, C4 to C40 cyclic olefins including cyclododecene; C2 to C10 halogenated vinyls containing vinyl chloride; Ethyl acrylate, methyl acrylate, and mixtures of two or more selected from among C3 to C30 acrylic esters. These ethylenically unsaturated compounds are used singly or as a mixture of plural kinds. Of these, preferred ethylenically unsaturated compounds are? -Olefins, more preferably? -Olefins having 2 to 4 carbon atoms, and most preferably ethylene.

In the production of polyketones, the charging ratio of the carbon monoxide and the ethylenic unsaturated compound is generally 1: 1. In the present invention, the charging ratio of the carbon monoxide and the ethylenic unsaturated compound is adjusted to a molar ratio of 1:10 to 10: 1 . As in the present invention, when an ethylenically unsaturated compound and carbon monoxide are mixed in an appropriate ratio, they are effective also in terms of catalytic activity, and the intrinsic viscosity improvement effect of the produced polyketone can be simultaneously achieved. When carbon monoxide or ethylene is added in an amount of less than 5 mol% or more than 95 mol%, the reactivity is poor and the physical properties of the produced polyketone may be deteriorated.

On the other hand, the polyketone copolymer used as the fiber may be composed of ethylene, propylene, and carbon monoxide, and the molar ratio of the ethylene and propylene is preferably 100: 0 to 90:10.

On the other hand, the molecular weight distribution of the polyketone is preferably in the range of 1.5 to 4.0, and if it is less than 1.5, the polymerization yield is lowered. In order to control the molecular weight distribution, it is possible to adjust proportionally according to the amount of the palladium catalyst and the polymerization temperature. That is, when the amount of the palladium catalyst is increased or when the polymerization temperature is 100 or more, the molecular weight distribution becomes large. The molecular weight distribution of the most preferred polyketones is 2.5 to 3.5.

Particularly preferred are polyketone polymers having a number average molecular weight of from 100 to 200,000, especially from 20,000 to 90,000, as measured by gel permeation chromatography. The physical properties of the polymer are determined according to the molecular weight, depending on whether the polymer is a copolymer or a terpolymer and, in the case of a terpolymer, the properties of the second hydrocarbon part. The melting point of the total of the polymers used in the present invention is 175 to 300 占 폚, and is generally 210 to 270 占 폚. The intrinsic viscosity (LVN) of the polymer measured by HFIP (Hexafluoroisopropylalcohol) at 60 DEG C using a standard tubular viscosity measuring apparatus is 0.5 dl / g to 10 dl / g, and preferably 5.0 dl / g to 7.0 dl / g . At this time, when the intrinsic viscosity of the polyketone polymer is less than 5.0, the mechanical strength is lowered in production of the fiber, and when it exceeds 7.0, the workability is lowered.

The production method of the polyketone fiber of the present invention will be described.

First, the solution extruded from the spinning nozzle passes through an air gap in a vertical direction and solidifies in a coagulating bath. At this time, the air gap is radiated within a range of about 1 to 300 mm in order to obtain a dense and uniform fiber and to provide a smooth cooling effect.

Thereafter, the filament passing through the coagulation bath passes through the water bath. At this time, the temperature of the coagulation bath and water bath is maintained at about 0 to 80 ° C to prevent the deterioration of physical properties due to the formation of pores in the fiber structure due to rapid desolvation.

The fibers having passed through the water-washing tank were subjected to acid washing in an aqueous solution containing the acid, passed through a second water-washing bath to remove the acid, passed through a dryer, and then emulsified in an emulsion- do.

In addition, in order to improve the flatness and improve the property of the housing, it passed the interlace nozzle. At this time, the air pressure was supplied at 0.5 to 4.0 kg / cm 2, and the number of entanglement per filament was 2 to 40.

Thereafter, the filament yarn passed through the interlace nozzle is dried while passing through the drying device. In this case, the drying temperature and the drying method have a great influence on the post-processing and physical properties of the filament.

The filament that has passed through the drying device is finally wound in a winder through a secondary emulsion treatment device.

Further, the stretching process in the polyketone fibers of the present invention is very important for improvement of high strength and water resistance. In the drawing method, hot air heating method and roller heating method are used, but since the filament is in contact with the roller surface in the roller heating method, the fiber surface is likely to be damaged, so that hot air heating method is more effective in manufacturing high strength polyketone fiber. However, the inventors of the present invention have found that when using a roller heating method, particularly a hot-roll drying method, a heat-resistant stabilizer is applied, and in the course of washing the fibers, 1.0 to 2.0 times, preferably 1.2 to 1.6 times, more preferably 1.2 to 1.4 times High strength multifilament was obtained. At this time, the strength of the fiber at drawing of less than 1.0 times is lowered, and the workability at the time of drawing of more than 2.0 times is lowered.

That is, the present invention is characterized in that the stretching process is performed by using a method of passing through a heating chamber at 230 ° C to 300 ° C.

On the other hand, as the solvent for dissolving the polyketone, it is preferable to use an aqueous solution containing at least one metal salt selected from the group consisting of zinc salts, calcium salts, lithium salts, thiocyanates and iron salts. Specific examples of the zinc salt include zinc bromide, zinc chloride and zinc iodide. Examples of the calcium salt include calcium bromide, calcium chloride and calcium iodide. Examples of the lithium salt include lithium bromide, lithium chloride, lithium iodide . Examples of the iron salts include iron bromide and iron iodide. Among these metal salts, it is particularly preferable to use at least one selected from the group consisting of zinc bromide, calcium bromide, lithium bromide and iron bromide in terms of the solubility of the raw material polyketone and the homogeneity of the polyketone solution.

The concentration of the metal salt in the metal salt aqueous solution of the present invention is preferably 30 to 80 wt%. If the concentration of the metal salt is less than 30% by weight, the solubility decreases. If the concentration of the metal salt is more than 80% by weight, the cost for concentration increases, which is disadvantageous in terms of economy. As the solvent for dissolving the metal salt, water, methanol, ethanol and the like can be used. In particular, water is used in the present invention because it is economical and advantageous in solvent recovery.

In order to obtain a polyketone fiber having high strength and high fatigue resistance and dimensional stability as a core technical matter in the present invention, an aqueous solution containing zinc bromide is preferable, and the composition ratio of zinc bromide in the metal salt is an important factor. For example, in an aqueous solution containing only zinc bromide and calcium bromide, the weight ratio of zinc bromide to calcium bromide is 80/20 to 50/50, more preferably 80/20 to 60/40. Further, in the aqueous solution containing zinc bromide, calcium bromide and lithium bromide, the total weight ratio of zinc bromide, calcium bromide and lithium bromide is 80/20 to 50/50, more preferably 80/20 to 60/40, , The weight ratio of calcium bromide to lithium bromide is 40/60 to 90/10, preferably 60/40 to 85/15.

The production method of the polyketone solution is not particularly limited, but an example of a preferable production method will be described below.

The metal salt aqueous solution maintained at 20 to 40 캜 is defoamed at a pressure of 200 torr or less, the polyketone polymer is heated to 60 to 100 캜 under a vacuum of 200 torr or less, and stirred for 0.5 to 10 hours to prepare a sufficiently dissolved homogeneous dope .

At this time, it is preferable that the polyketone polymer is filtered through a disk filter as shown in FIG. 2 to remove impurities.

When a disk filter is used to remove impurities, there is no low flow or dead area, so that the flowability of the spinning liquid is enhanced by uniform pressure distribution, and the filter life can be improved. In the case of using the conventional candle filter (FIG. 1), the filter has a maximum life of 9 days, whereas the disk filter can be improved to 45 days or more due to optimization of the dissolution process. Further, since the lifetime of the filter is improved, stable continuous operation can be achieved.

In the present invention, the polyketone polymer may be mixed with other polymer materials or additives. Examples of the polymer material include polyvinyl alcohol, carboxymethyl polyketone, and polyethylene glycol. Examples of additives include viscosity improvers, titanium dioxide, silica dioxide, carbon, and ammonium chloride.

Hereinafter, a method of producing a polyketone fiber including spinning, washing, drying and stretching the homogeneous polyketone solution of the present invention will be described in more detail. However, the polyketone fibers claimed in the present invention are not limited by the following process.

The spinning process of the method according to the present invention will be described in more detail. An orifice having a diameter of 100 to 500 μm and a length of 100 to 1500 μm, wherein the ratio of the diameter to the length (L / D) is 1 to 3 to 8 times, The spinning stock solution is extruded and spun through a spinning nozzle containing a plurality of orifices having an interval of 1.0 to 5.0 mm to allow the fiber spinning solution to pass through the air layer to reach the coagulation bath and then solidify to obtain multifilaments .

The shape of the spinning nozzle used is usually circular, and the nozzle diameter is 50 to 200 mm, more preferably 80 to 130 mm. When the nozzle diameter is less than 50 mm, the distance between the orifices is too short, so that the adhesion may occur before the discharged solution solidifies. If the nozzle diameter is too large, peripheral devices such as spinning packs and nozzles become large, If the diameter of the nozzle orifice is less than 100 탆, a large number of yarn breaks occur at the time of spinning, which adversely affects radioactivity. If the diameter exceeds 500 탆, the coagulation speed of the solution in the spinning coagulation bath is slow, And water washing becomes difficult.

Considering the orifice spacing for uniform cooling of the solution, the number of orifices should be 100 to 2,200, more preferably 300 to 1,400.

If the number of orifices is less than 100, the fineness of each filament becomes thick and the solvent can not sufficiently escape within a short time, so that the coagulation and flushing can not be completely performed. If the number of the orifices is more than 2,200, the adjacent filaments are likely to be closely attached to each other in the air layer section, and the stability of the filaments after spinning is lowered, resulting in deterioration of physical properties, and may cause problems in the continuous yarn and heat treatment process.

When the fiber stock solution passing through the spinning nozzle coagulates in the upper coagulating solution, the larger the diameter of the fluid becomes, the larger the difference in the coagulation speed between the surface and the inside becomes, and it becomes difficult to obtain a dense and uniform tissue fiber. Therefore, when the polyketone solution is spun, even if the same discharge amount is maintained, the spun fibers having a smaller diameter can be obtained in the coagulating solution while maintaining an appropriate air layer.

The air layer is preferably 5 to 50 mm, more preferably 10 to 20 mm. It is difficult to increase the spinning speed because the too short air layer distance increases the micropore generation rate due to the rapid surface layer coagulation and desolvation process, and it is difficult to increase the spinning speed. On the other hand, the too long air layer distance is affected by the adhesion of the filament, It is difficult to maintain process stability.

The composition of the coagulating bath used in the present invention is such that the concentration of the metal salt aqueous solution is 1 to 20% by weight. The coagulating bath temperature is maintained at -10 to 60 ° C, more preferably -5 to 20 ° C. In the coagulation bath, when the filament passes through the coagulation bath of the multifilament, when the spinning speed is increased by 500 m / min or more, the coagulation of the coagulating solution becomes severe due to the friction between the filament and coagulating liquid. In order to improve the productivity by increasing the excellent physical properties and the spinning speed through the stretching orientation, such a phenomenon is a factor that hinders the process stability, so that it is necessary to minimize such a phenomenon.

In the present invention, the coagulating bath is characterized by a temperature of -10 to 40 ° C and a metal salt concentration of 1 to 30% by weight, and the water bath is preferably at a temperature of 0 to 40 ° C and a metal salt concentration of 1 to 30% The acid washing bath preferably has a temperature of 0 to 40 캜 and an acid concentration of 0.5 to 2% by weight, and the secondary washing bath for acid removal is maintained at a temperature of 30 to 70 캜.

Also, in the present invention, the temperature of the dryer is 100 ° C or higher, preferably 200 ° C or higher, and the emulsion, heat-resistant agent, antioxidant or stabilizer is added to the fiber passed through the dryer.

Further, the stretching process in the polyketone fibers of the present invention is very important for improvement of high strength and water resistance.

Hereinafter, the stretching process and drying method important in the present invention will be described.

The present invention provides a high-strength fiber by securing the heat stability of the polyketone during wet spinning and by directly drying the fiber. In the conventional spinning process, the maximum strength is 13 g / d even at the time of germination drying and optimization of the stretching temperature. However, the present invention optimizes the heating method and the temperature profile of the drying method to form a dense structure by fusion- As a result, the draw ratio and the strength are improved. Further, in order to prevent thermal deterioration of the polyketone at the time of heating, the stretching magnification and strength are improved by a process including a heat stabilizer during drying and stretching.

Polyketone fibers have oxidation or degradation mechanisms at high temperatures. As a radical oxidation mechanism, polyketone releases carbon dioxide and oxidative degradation occurs when exposed to oxygen at temperatures above 90 ° C. In addition, due to the radical deterioration mechanism, when the polyketone is exposed to a high temperature of 200 ° C or more, carbon monoxide and ethylene are released and thermal degradation occurs. A heat-resistant stabilizer is used to prevent oxidation and deterioration of the polyketone at such a high temperature. As the heat-resistant stabilizer, both of antioxidants capable of preventing radical oxidation and deterioration can be used.

Preferably, phenolic heat stabilizers are used, and one or more heat stabilizers may be used alone or in combination. Oxidation and deterioration prevention mechanisms prevent radicals by radicals by capturing radicals with heat stabilizers, such as alkyl radicals generated by heat or ultraviolet rays (see FIG. 4). The heat stabilizer may be used before drying or before stretching, and the immersion or application method may be used alone or in combination. Specifically, in an embodiment of the present invention, 0.1% of a solution of a phenolic heat stabilizer obtained by mixing a phenolic heat stabilizer with a methanol solvent in a pre-drying step and a stretching step is applied in a pre-drying step and a drawing step, Of the heat stabilizer was 250 ppm, but after the drying and the stretching step, 25 ppm remained. The heat stabilizer should be used in an appropriate amount depending on the process. If the heat stabilizer is large, the workability is poor. If the heat stabilizer is small, the heat stabilization effect is not sufficient. The heat stabilizer may be used in one-pot or two-pot or more.

Meanwhile, in order to increase the strength of the fiber, the present invention uses a direct drying method of a hot roller drying method, rather than an indirect drying method of a hot air drying method. In the conventional hot air drying method, the hot air drying method as shown in FIG. 5 was used at a temperature of 180 ° C. for a retention time of about 3 minutes and 30 seconds. This has the effect of achieving uniform drying and improving the close-up, but it has a lot of troubles, loops, static electricity, and difficulty in the fusion structure, so that the structure is not precise. In the present invention, the hot roll drying method as shown in FIG. 6 is used at a temperature of 220 to 230 ° C. for a retention time of about 1 minute and 30 seconds by a hot roll drying method. When such a drying method is used, there is no entanglement, less generation of static electricity, and a fine structure due to the formation of a fusion structure, which is easy to apply for commercialization (see FIG. 8).

In addition, the present invention is subjected to a stretching process in which the fibers are stretched 15 to 18 times. For stretching the polyketone fibers, stretching is carried out in one or more stages. In the case of multi-stage stretching, it is preferable to perform the temperature-raising stretching in which the stretching temperature gradually increases with an increase in the stretching magnification. Specifically, the stretching process is performed at a temperature of 240 to 270 ° C, and the residence time is within about 1 minute and 30 seconds, and the first and second stages are performed. Stretching is carried out from step 1 to step 7, second step to step 2.5, and step 2 is stepwise stretching in a 3 step form. After the first stage, the elongation of the polyketone fibers is 10% and the strength is 8 g / d. After the second stage, the elongation is about 5.2%, and the strength of the polyketone fibers is 20 g / d.

In addition, since the polyketone is thermally deteriorated at a high temperature due to the drying and stretching process as described above, a heat stabilizer is added. It is applied before drying or before stretching. In the present invention, both raw or dip can be used. In general, when the two-dip or more is performed, the elongation of the fiber is decreased independently of the increase in the strength, but in the case of the hot-roll drying method according to the present invention, there is little decrease in elongation.

The multifilament produced by the method according to the present invention is a polyketone multifilament with a total denier range of 500 to 3,500 and a breaking load of 6.0 to 40.0 kg. The multifilament is composed of 100 to 2,200 individual filaments with a fineness of 0.5 to 8.0 denier.

The fiber density of the monofilament is 1.295 to 1.310 g / cm < 3 > by the hot-roll drying method of the present invention and the step of adding the heat stabilizer, and the structure thereof is as shown in Fig. As a result, the initial modulus value of the polyketone monofilament prepared by the above process is 200 g / d or more, elongation at 2.5 g / d at 2.5 g / d and elongation at least 0.5% at 19.0 g / d or more.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail with reference to examples. However, the embodiments according to the present invention can be modified into various other forms, and the scope of the present invention should not be construed as being limited to the embodiments described below. Embodiments of the invention are provided to more fully describe the present invention to those skilled in the art.

Example 1

A zinc bromide aqueous solution having a concentration of 60% by weight was injected into an extruder maintained at an internal temperature of 30 캜 at an injection temperature of 25 캜 by a gear pump at a rate of 13000 g / hour to obtain a polyketone powder having a molecular weight distribution of 3.0 and an intrinsic viscosity of 6.0 dl / The extruder was injected at 1160 g / hour into a screw type feeder, the residence time in the extruder swelling zone was set to 0.8 minutes, the temperature was raised to 40 DEG C, the polyketone powder was sufficiently dissolved in the metal salt solution, The polyketone solution was filtered through a disc filter to remove impurities, and the polyketone fibers were prepared by wet spinning via G / P.

At this time, a circular nozzle having an odd number of nozzles of 667 and a diameter of 0.18 mm and an L / D of 1 was used, and an air gap was 10 mm. The concentration of the polyketone in the discharged solution was 8.2% by weight, and it was in a homogeneous state free of undissolved polyketone particles.

The fiber thus obtained is subjected to stretching at 1.2 times in the course of washing, and the heat stabilizer is dipped in a 0.1% solution of a mixed solution of AO80 and methanol of Adeka as a phenolic heat stabilizer before drying. In the drying process, 1.2-fold stretching was performed by a hot-roll drying method, and then fibers were produced in a heating chamber method at a total stretching magnification of 16.8 times, stretched at a stretch ratio of 7 times at the first stretch, 2.4 times at the second stretch, 1.5, 1.3, and 1.23 times, and each step is performed at temperatures of 240, 255, 265, and 268 ° C.

Example 2

except that the temperature of each step of the first and second steps in the heating chamber type stretching was adjusted to 240, 250, 260 and 268 캜.

Example 3

except that the temperature of each step of the first and second stages in the heating chamber type stretching was adjusted to 240, 255, 265, and 272 캜, respectively.

Example 4

A zinc bromide aqueous solution having a concentration of 60% by weight was injected into an extruder maintained at an internal temperature of 30 캜 at an injection temperature of 25 캜 by a gear pump at a rate of 13,000 g / hour to obtain a polyketone powder having a molecular weight distribution of 3.0 and an intrinsic viscosity of 5.7 dl / The extruder was injected at 1160 g / hour into a screw type feeder, the residence time in the extruder swelling zone was set to 0.8 minutes, the temperature was raised to 40 DEG C, the polyketone powder was sufficiently dissolved in the metal salt solution, The polyketone solution was filtered through a disc filter to remove impurities, and the polyketone fibers were prepared by wet spinning via G / P.

Example 5

The same as Example 4 except that the intrinsic viscosity of the polyketone polymer was adjusted to 6.1 dl / g.

Example 6

And the intrinsic viscosity of the polyketone polymer was adjusted to 6.3 dl / g.

Example 7

A zinc bromide aqueous solution having a concentration of 60% by weight was injected into an extruder maintained at an internal temperature of 30 캜 at an injection temperature of 25 캜 by a gear pump at a rate of 13,000 g / hour to obtain a polyketone powder having a molecular weight distribution of 2.5 and an intrinsic viscosity of 6.0 dl / The extruder was injected at 1160 g / hour into a screw type feeder, the residence time in the extruder swelling zone was set to 0.8 minutes, the temperature was raised to 40 DEG C, the polyketone powder was sufficiently dissolved in the metal salt solution, The polyketone solution was filtered through a disc filter to remove impurities, and the polyketone fibers were prepared by wet spinning via G / P.

Example 8

The same as Example 7 except that the molecular weight distribution of the polyketone polymer was adjusted to 2.8.

Example 9

And the molecular weight distribution of the polyketone polymer was adjusted to 3.5.

Example 10

The procedure of Example 1 was repeated except that a 0.1% solution of a mixed solution of AO80 and methanol of Adeka as a phenolic heat stabilizer was subjected to 1 dip before drying.

Example 11

Example 1 was the same as Example 1 except that a 0.1% solution of AO80 and methanol of Adeka Co. as a phenolic heat stabilizer was subjected to two dipping before drying and before drawing.

Comparative Example 1

Polyketone fibers were prepared in the same manner as in Example 1, except that a candle filter was used in place of the disk filter used in Example 1 to remove impurities.

Property evaluation

The filter replacement period is determined by the differential pressure value of the front and rear ends of the filter. In case of the disk filter, the limit pressure difference is changed to 40 bar when it reaches this value.

Filter replacement cycle Continuous operation Example 1 More than 45 days More than 45 days Example 2 More than 45 days More than 45 days Example 3 More than 45 days More than 45 days Example 4 More than 45 days More than 45 days Example 5 More than 45 days More than 45 days Example 6 More than 45 days More than 45 days Example 7 More than 45 days More than 45 days Example 8 More than 45 days More than 45 days Example 9 More than 45 days More than 45 days Example 10 More than 45 days More than 45 days Example 11 More than 45 days More than 45 days Comparative Example 1 Within 9 days Within 9 days

As shown in Table 1, the lifetime of the filter was improved to 45 days or more in the case of the embodiment, and continuous operation was possible for more than 45 days.

Claims

(Bis (methylene)) bis (bis (2-methoxyphenyl) phosphine) polymerization catalyst and an acid having a pKa of 4 or less In the presence of a catalyst composition comprising an anion of an anion and a mixed solvent to produce a polyketone by polymerizing carbon monoxide and an ethylenically unsaturated compound;
An aqueous solution containing at least one metal salt selected from the group consisting of a zinc salt, a calcium salt, a lithium salt, a thiocyanate salt and an iron salt; and injecting and dissolving the polyketone in an extruder to prepare a polyketone solution;
Filtering the polyketone solution through a disk filter to remove impurities; And
Comprising the steps of: preparing a polyketone fiber through a spinning process, a water washing process, a drying process and a stretching process,
Wherein the stretching is 1.0 to 2.0 times in the washing step and 1.0 to 2.0 times in the drying step,
The drying step is hot-rolled at 100 to 230 ° C, and the stretching step is a heating chamber stretching method at 230 to 300 ° C.
Wherein the heat-resistant stabilizer is treated before the drying step and the stretching step.

The method according to claim 1,
Wherein the polyketone comprises a catalytic composition comprising a Group 9, Group 10 or Group 11 transition metal compound, a ligand comprising an element of Group 15 and an anion of an acid having a pKa of 4 or less; And a step of polymerizing carbon monoxide and an ethylenically unsaturated compound in the presence of a mixed solvent to prepare a polyketone fiber.

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