JP3785604B2 - Method for producing multifilament elastic yarn - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for producing a polyurethane multifilament elastic yarn, a method for producing a polyurethane elastic yarn having stable profiled cross-section shape to the shape of the arbitrary especially.
[0002]
[Prior art]
Conventionally, a melt spinning method in which a plurality of thermoplastic polyurethane multifilaments are fused in the fiber length direction to be integrated into a monofilament is proposed in Japanese Patent Laid-Open No. 53-139847. In spinning, a method for producing a modified cross-section fiber by spinning the spinneret in a different shape has been proposed in Japanese Patent Application Laid-Open No. 7-197318.
[0003]
[Problems to be solved by the invention]
However, in these conventional methods, the fusion of the entire multifilament and the modification of the cross section of the elastic yarn were not intended or suggested at all.
[0004]
The present invention, by integrating the polyurethane multifilament elastic yarn to monofilament, and is intended to St. provide a method for stably producing a multifilament elastic yarn was profiled yarns sectional shape.
[0005]
[Means for Solving the Problems]
The present invention employs the following means in order to achieve such a problem.
That is, the manufacturing method of the multi-filament elastic yarn of the present invention, a polyurethane multi filament elastic yarn, a groove is provided for circulating the rollers surface was heated to a temperature below the melting point or the softening point of the polyurethane of the nip heating roller by hot-pressing while passing cars in the groove, it is characterized in that by profiled yarns sectional shape of the multi filament elastic yarn, and to irregular monofilament by crimping the single yarns to each other.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
The present invention has intensively studied whether a multifilament elastic yarn having an irregular cross-sectional shape can be produced efficiently and stably. As a result , polyurethane multifilaments are aligned and pressed with an appropriate heating and pressing member. Thus, it has been clarified that the above-mentioned problems can be solved at once.
[0007]
Multifilament elastic yarn in the present invention is comprised of port Riureta down. Cal elastic yarn or are those generally been used to converge the multifilament round cross-section. The inventors of the present invention have found that when the elastic yarn is heated and pressed to have a deformed cross-sectional shape such as flattened, it is possible to provide a high-quality fashionable string-like material that is really flexible and feels good. is there.
[0008]
Hereinafter, the present onset Akira to describes polyurethane multi-filament elastic yarn. The polyurethane referred to in the present invention may be thermoplastic or other than thermoplastic.
[0009]
The polyurethane used in the present invention is a polyurethane obtained by reacting a monofunctional amine and all with a polyfunctional organic amine or organic diol as a chain extender and a terminal blocker as a copolymer of polyol and diisocyanate.
[0010]
Of these diisocyanates, diphenylmethane diisocyanate (hereinafter referred to as MDI) and hydrogenated MDI (hereinafter referred to as HMDI) are particularly preferable. Polyurethane fibers made of MDI have high strength, high heat resistance, and good solvent resistance. On the other hand, the polyurethane fiber made of HMDI has a great advantage that the light resistance becomes high when a polyol and an extender are appropriately selected.
[0011]
Needless to say, the diisocyanate of the polyurethane fiber of the present invention is not necessarily limited to one type, and a plurality of types of diisocyanates may be used in combination.
[0012]
Next, the polyol will be described. The polyol is not particularly limited, and polytetramethylene ether glycol (hereinafter referred to as PTMG) and / or copolymer thereof, polypropylene glycol and / or ether polyol including the copolymer thereof, Polybutylene adipate glycol and / or copolymerization thereof, polyester polyols disclosed in JP-A-4-41714, etc., polycarbonate polyols including polyester polyols, polysiloxane polyols and the like Such known polyols are representative.
[0013]
And among these, as a thing preferable as an ether type polyol, PTMG and / or its copolymerization are mentioned. Typical PTMG copolymers include those obtained by adding ethylene oxide to the end of PTMG, and PTMG copolymerized with tetrahydrofuran (hereinafter referred to as THF) and 3-methyl THF.
[0014]
Polyurethane fibers made from such polyols have excellent low-temperature characteristics, high mold resistance, excellent recoverability, and high hydrolyzability.
[0015]
Other preferred polyols include polyester-based polyols having side chains such as methyl groups.
[0016]
Examples of such polyols include polyester polyols disclosed in JP-A-4-41714 and the like, and copolymerized glycols of neopentyl glycol and various aliphatic carboxylic acids including neopentyl glycol. A typical example is polycaprolactone diol copolymerized with neopentylglycol.
[0017]
Such ester-based polyols are particularly preferable because they have high mold resistance, excellent chlorine resistance, light resistance, and high hydrolysis resistance.
[0018]
As the molecular weight of such a polyol, those having a molecular weight of 2000 to 6000 are preferably used from the viewpoint of fiber strength and recoverability, and those having a molecular weight of 3000 to 5000 are particularly preferably used for polyols having no side chain. Is done.
[0019]
Next, the polyol of the polyurethane fiber of the present invention is not limited to one kind in the molecule, and any of ether-based polyols and ester-based polyols may be used. In some cases, it is better to use an ester polyol in combination.
[0020]
As the chain extender used for producing such polyurethane, known aliphatic, alicyclic and aromatic diamines can be used as the organic diamine. Typical examples include ethylenediamine (hereinafter referred to as EDA), propylenediamine (hereinafter referred to as PDA) such as 1,2-diamino-1-propylene, 1,2-diamino-2-propylene, butylenediamine (referred to as BDA). For example, 1,4-diamino-1-butene, 1,4-diamino-2-butene, 2,3-diamino-2-butene, 1,3-diamino-1-butene, 1,3-diamino-2-butene , Diethylenetriamine, hexamethylenediamine, cyclohexanediamine, phenylenediamine, tolylenediamine, xylenediamine, 3,3′-dichloro-4,4-biphenylamine, 2,6-diaminopyridine, 4,4′-diaminodiphenylmethane, etc. Is mentioned. Most preferred among such diamine extenders are EDA, PDA and BDA.
[0021]
As the organic diol, known aliphatic, alicyclic and aromatic diols can also be used. Typical examples include ethylene glycol (hereinafter referred to as EG), 1,3-propanediol (hereinafter referred to as PDO), 1,4-butanediol (hereinafter referred to as BDO), neopentyldiol, 1,2 -Propylenediol, 1,4-cyclohexanediol, 1,4-cyclohexanedimethanol, 1,4-bis (β-hydroxyethoxy) benzene (hereinafter referred to as BHEB), bis (β-hydroxyethyl) terephthalate, paraxylenediol Etc. are chain extenders. Among these diol extenders, EG, PDO, BDO and BHEB can be preferably used.
[0022]
In addition, the extending | stretching agent of the polyurethane fiber of this invention is not necessarily limited to 1 type, It cannot be overemphasized that the extending | stretching agent which consists of multiple types of diamine or diol may be used together.
[0023]
Next, the end-capping agent is described. Also known aliphatic, alicyclic, aromatic amine and alcohol can be used. Typical examples are dimethylamine, dimethylamine, ethanol, propanol (1-propanol, 2-propanol), propyl alcohol, and the like.
[0024]
The number average molecular weight of the polyurethane, which is the multifilament elastic yarn of the present invention, is preferably 10,000 to 100,000, particularly preferably 30,000 to 80,000, and the durability is remarkably improved not only in strength but also in practical use. It is good to do.
[0025]
The polyurethane multifilament elastic yarns are converged (aligned) , heated and pressed by a predetermined nip type heating roller , and the single filaments of the multifilament elastic yarns are fused or pressure-bonded to form the multifilament elastic yarns. The yarn cross-sectional shape is deformed into an appropriate shape and bonded to be deformed. The heating pressing, pressing member having a groove of any shape, i.e. by performing with the nip heating roller, it can be subjected to shaping into a desired shape. As the nip heating roller, using those having a groove of any shape by pressing by housing the multifilament elastic yarn in the groove, the multifilament elastic yarn according to the shape of the groove the Itojodan-sectional shape can be deformed into any shape. Here, the irregular shape may be at least one selected from a flat shape, a polygonal shape, a star shape, a horseshoe shape, an elliptical shape, and a semicircular shape, that is, a shape including an indefinite shape.
[0026]
According to the present invention, it is possible to provide a variable yarn by continuously or intermittently performing the heating and pressing. In addition, when a pressing surface of the pressing member having an appropriate form such as embossing is used, an elastic yarn in which the form is engraved can be provided. For example, if the pressing member having a jagged surface is deformed, for example, a flat elastic yarn can be provided on the jagged surface. That is, a desired arbitrary shape can be adopted for each of the grooves of the pressing member.
The heating applied during the heating and pressing is a temperature not lower than the softening point and not higher than the melting point of the polyurethane . Specifically, in the multifilament, each single yarn is slightly bonded to make it look like a single yarn, but the temperature from the temperature at which this bonding is released to the melting temperature. is there. For example, although it varies depending on the polymer, the temperature is preferably about 170 to 250 ° C., more preferably about 200 to 230 ° C. for polyurethane urea. As such a heating method, any one of heating using a nichrome wire heater or far-infrared heater without contact with the elastic yarn, or heating by directly contacting the surface of the elastic yarn, such as a hot roll, may be used.
[0027]
The material of the pressing member is not particularly limited, but it is preferable that the pressing member is made of a material such as silicon that is difficult to stick to a softened and melted elastic yarn. Further, the pressing member can apply pressure in the vertical direction, right and left direction, or a combination direction thereof with respect to the longitudinal direction of the elastic yarn.
[0028]
For example, the heating and pressing step can be set at an arbitrary position from the lower part of the spinning tube of the multifilament spinning step of the elastic polymer to the winding device, or has already been spun into a wound body. Even a thing, this heating press process can also be set to the arbitrary places until it unwinds from this wound thread body and winds up again.
[0029]
The multifilament spinning process of the present invention is not limited to a specific method. Regarding dry spinning, the temperature of the spinning solution is not limited, and any temperature can be employed. There is no particular problem even when the temperature is higher than the melting point or softening point of the spinning solute. Also, the discharge speed is not particularly limited. Furthermore, an arbitrary shape of the base is applied. The number of single filaments of the multifilament can be set to an arbitrary number by changing the number of holes in the die.
[0030]
The spinning solution is discharged from such a die to form a yarn and then heated. The heating may be from a cylinder or by a heated gas. Moreover, these combined use may be sufficient. Particularly preferable from the viewpoint of thermal efficiency is heating the heated gas and the cylinder. When using heated gas, the supply system is not particularly limited.
[0031]
The shape of the cylinder is not particularly limited, and may be circular, rectangular, or polygonal, and is not particularly limited.
[0032]
The heating gas is preferably selected appropriately depending on the type of spinning volatile matter. When the spinning volatile matter is a volatile organic solvent, it is preferable that the main component is an inert gas.
[0033]
The multifilament elastic yarn of the present invention is obtained by applying the production method of the present invention immediately after the heated fiber passes through the spinning tube and immediately before it becomes a winding device, that is, a wound body.
[0034]
FIG. 1 is a schematic view showing an embodiment for producing the polyurethane multifilament elastic yarn of the present invention.
[0035]
In this example, the multi-filament modified cross-section device has a feeding section 1 that feeds elastic yarn from a winding body at a predetermined speed, and two hot press rolls for heating and pressing the fed elastic yarn. The deformed portion 2 and the winding portion 3 for winding the deformed elastic yarn are configured.
[0036]
The feeding unit 1 includes a first roller 4 and 5 attached to the pedestal by a bearing, a driving device 6 for rotating the first roller 4 and 5, and a rotatable guide attached to the pedestal via a bracket by a bearing. It is composed of rolls 7 and 9 and a dancer roll 8 attached to a potentiometer for detecting the tension of the multifilament, and rotates a multifilament winding 10 placed on the first rollers 4 and 5. The yarn is sent out at a predetermined speed.
[0037]
The drive device 6 described above is configured to transmit the rotation of the motor whose speed is controlled to the first rollers 4 and 5 by a rotation transmission member such as a pulley and a belt.
[0038]
The modified cross section 2 includes guide rolls 11 and 12 that are rotatably attached to the gantry by bearings, a bracket that is attached to the gantry, a hot press roll 13 that is attached to the bracket by a bearing, and a hot press roll. A hot press roll 14 attached to two air cylinders 15, 16 attached to a bracket so as to be parallel to the bracket 13 by a bearing, and a driving device 17 for rotating the hot press roll 13.
[0039]
The above-described driving device 17 transmits the rotation of the motor whose rotation is controlled to the hot press roll 13 by a rotation transmission member such as a pulley and a belt.
[0040]
The winding unit 3 includes a rotatable guide roll 18 attached to a main body frame by a bearing, a dancer roll 19 for detecting a multifilament tension by a potentiometer, and a groove cam type (not shown) traverse roll 20. And a drive roll 21 and a take-up roll 22 attached by a bearing to a main body frame that moves on a semicircle as the take-up radius of the filamentous material increases. The above-described guide roll 18, dancer roll 19 and traverse roll 20 are mounted on a bracket that is moved by a groove cam. The driving device 23 transmits the rotation of the electric motor whose speed is controlled by a rotating member transmitting member such as a pulley and a belt to the groove cam and the drive roll.
[0041]
In this state, the multifilament winding body 10 is placed on the first rollers 4 and 5 of the feeding unit 1, and the multifilament 24 pulled out from the winding body is guided to the guide roll 7, dancer roll 8, guide roll 9, 11, 12, hot press rolls 13 and 14, guide roll 18, dancer roll 19, traverse roll 20, drive roll 21, and tie to take-up roll 22.
[0042]
When these preparations are completed, the first rollers 4 and 5 are started, and the elastic yarn is fed out at a preset speed to be heated and pressed.
[0043]
When the above-described elastic yarn is fed, the potentiometer detects the displacement angle of the dancer rolls 8 and 19 and sends a signal to the control devices of the drive devices 6, 17 and 23 to rotate at a predetermined speed. Then, the elastic yarn 24 is heated and pressed between the hot press roll 14 and the hot press roll 13 that are lowered by the air cylinders 15 and 16 of the modified cross-section part 2, and becomes, for example, a flattened elastic yarn 25, The take-up unit 3 takes up the take-up roll 22 via the traverse roll 20 and the drive roll 21.
[0044]
FIG. 2 is a schematic view showing an embodiment for directly producing a modified cross-section yarn by installing the above-mentioned modified cross-section device between the lower part of the spinning cylinder and the winding section.
[0045]
In this example, it is composed of an existing spinning cylinder 26 for sending out an elastic yarn 37, a winding unit for winding the elastic yarn 37, and a modified cross-section unit 27 having two hot press rolls installed between them.
[0046]
As in FIG. 1, the modified cross section 27 has a guide roll 30, 31, two hot press rolls 33, 34, two air cylinders 35, 36, a drive unit 29 for the hot press roll 32 and a winding speed. The preheater 32 using far-infrared rays is used to give residual heat to the elastic yarn.
[0047]
The winding unit 28 is attached to the main body frame, and each of the feed rolls 39 and 40 is rotated by a driving device (not shown), a groove cam type (not shown) traverse guide 41, a drive roll 42, and a thread-like shape. A winding roll 43 attached to a main body frame that moves on a semicircle of a winding radius of an object by a bearing.
[0048]
The traverse guide 41 and the drive roll 42 described above are transmitted with the rotation of the motor whose speed is controlled by a transmission member such as a pulley belt.
[0049]
In this state, the elastic yarn 37 fed from the spinning tube lower portion 26 is sucked by a sucker gun or the like, while the guide roll 30, the preheater 32, the guide roll 31, the hot press rolls 33 and 34, the feed rolls 39, 40, It winds around the take-up roll 43 through the traverse guide 41 and the drive roll 42.
[0050]
When these preparations are completed, the traverse guide 41 and the drive roll 42 of the winding unit 28 are driven, and at the same time, the air cylinders 35 and 36 of the modified cross section 27 are lowered. The elastic yarn 37 is preheated by the preheater 32 and heated and pressed by the hot press rolls 33 and 34 to form, for example, a deformed cross-section yarn 38 that is deformed flatly. The winding section 28 uses the traverse guide 41 and the drive roll 42. Is wound around the winding roll 43.
[0051]
FIG. 3 is an example (A to G) of schematic views showing cross-sectional shapes of various deformed elastic yarns manufactured by such a method, but of course the mold has a stamped pattern such as an embossed surface. Can be easily formed. As can be seen from this example, the shape is at least one selected from flat, polygonal, star-shaped, horseshoe-shaped, elliptical, and semi-circular, that is, the combined shape and the length direction of the elastic yarn. Those having a cross-sectional shape changed to the above, and those having an indefinite shape can be easily formed by a combination, and are not limited to the shapes exemplified here. Further, in this example, the shape of the single yarn is indicated by a round shape for convenience, but of course includes a portion deformed by pressing, and the degree of deformation is large depending on the magnitude of the pressing force. It goes without saying that there are.
[0052]
FIG. 4 shows an example of the shape of the groove processed into the hot press roll 13 of FIG. Further, the shape of the groove is not limited to the shape exemplified here, and the shape can be appropriately selected in order to obtain the cross-sectional shape of the elastic yarn as shown in FIG.
[0053]
【Example】
Hereinafter, the present invention will be described more specifically with reference to examples. However, the present invention is not limited to the following examples.
[0054]
A molecular weight of 2000 polytetramethylene ether glycol and 2000 g of diphenylmethane diisocyanate and 400 g of diphenylmethane diisocyanate were charged into a stirred vessel sealed with nitrogen so that the addition ratio was 1.60, and reacted at 90 ° C. to obtain a prepolymer. Next, 699 g of this prepolymer was dissolved in 1288 g of dimethylacetamide, and 11 g of ethylenediamine as a chain extender and 1.6 g of diethylamine as a terminal blocking agent were added so that the molar ratio to the prepolymer was 1.05. The mixture was stirred and reacted at 0 ° C. to obtain a polyurethane solution.
[0055]
To the polyurethane solution, a stabilizer prepared by adjusting a weight ratio of a modifier such as titanium oxide to 6% was added and stirred.
[0056]
When the number average molecular weight of the polyurethane contained in the obtained polyurethane solution was measured by the GPC method, it was about 38,000 in terms of polystyrene. Moreover, the heat softening point of the polyurethane measured by the TMA method was 170 ° C.
[0057]
The polyurethane solution is heated to 50 ° C., and a die having 200 discharge holes with a hole diameter (D) = 0.20 mm, a hole length (L) = 0.55 mm, and L / D = 2.75 is used. The solution was discharged into the spinning cylinder with a 22.5 KG solution per unit time.
[0058]
The temperature inside the spinning cylinder was the heating temperature, that is, the wall surface temperature of the spinning cylinder was 300 ° C. The drying air at this time was 400 ° C., and nitrogen gas of 60 KG per hour was blown out from the top of the spinning cylinder.
[0059]
The obtained polyurethane yarns were divided into four yarn bundles at the convergence guide at the bottom of the spinning cylinder every 50, and converged in the spinning cylinder with pressurized air.
[0060]
At that time, a polyurethane yarn having a take-up speed of 1000 m / min, a take-up speed of 1150 m / min, a speed ratio (winding speed / take-up speed) of 1.15 and a winding speed of 840d was obtained.
[0061]
Using the apparatus of the present invention (FIGS. 1 to 2) , the obtained polyurethane yarn was formed into a modified cross section at a winding speed of 3 m / min and a hot roll surface temperature of 220 ° C.
At this time, the hot roll had a normal circular cross-sectional shape and was continuously pressurized, and the applied pressure was 20 kg / cm ³ by an air cylinder. The resulting elastic yarn had a flat shape (Reference Example) .
[0062]
Only the hot press roll 13 in the same apparatus as described above was replaced with the one shown in FIG. 4 and processed under the same conditions. As a result, an elastic yarn having the configuration shown in FIG. 3-B was obtained.
[0063]
In addition, using the apparatus of the present invention from the bottom of the spinning cylinder, the pre-heater temperature was 490 ° C. and the hot roll surface temperature was 230 ° C. under the above spinning conditions. The surface shape of the hot roll is a normal circle, and is a type that continuously pressurizes, and the applied pressure is 20 kg / cm ³ by an air cylinder. The elastic yarn obtained as a result had a form as shown in FIG.
[0064]
【The invention's effect】
According to the present invention, it is possible to efficiently and stably provide a string-like article made of a highly fashionable elastic yarn that is flexible and has a good feel, and that the string-like article is thick. In addition, it can be processed freely including the deformation amount, the surface shape and the cross-sectional shape.
[Brief description of the drawings]
FIG. 1 is a schematic view showing an example of a method for producing a multifilament elastic yarn of the present invention.
FIG. 2 is a schematic view showing an example in which the heating and pressing step is installed between the lower part of the spinning cylinder and the winding device using the method for producing a multifilament elastic yarn of the present invention.
FIG. 3 is an example of a schematic diagram showing cross-sectional shapes of various deformed cross-sectional yarns manufactured using the method for manufacturing a multifilament elastic yarn of the present invention.
FIG. 4 is an example in which a groove is formed on the surface of the hot press roll 13 of FIG. 1 showing an example of the production method of the present invention in order to obtain a multifilament elastic yarn having an arbitrary cross-sectional shape.
[Explanation of symbols]
1: Feeding section 2: Deformed section section 3: Winding section 4, 5: First roller 8, 19: Dancer rolls 7, 9, 11, 12, 18: Guide roll 10: Winding bodies 6, 17, 23 : Drive devices 13 and 14: Hot press rolls 15 and 16: Air cylinder 20: Traverse roll 21: Drive roll 22: Winding roll 24: Elastic thread 25: Deformed section thread 26: Spinning cylinder lower part 27: Deformed section section 28 : Winding unit 29: drive unit 30, 31: guide roll 32: preheater 33, 34: hot press roll 35, 36: air cylinder 37: elastic yarn 38: deformed section yarn 39, 40: feed roll 41: traverse Guide 42: Drive roll 43: Winding roll

Claims (6)

Polyurethane Ma Ruchifiramen preparative elastic yarn, a groove is provided for circulating the rollers surfaces, by pressurizing Netsu押while passing cars in the groove of the nip heating roller heated to above the softening point temperature below the melting point of the polyurethane, multi filament elastic yarn turned into profiled yarns cross section shape of, and method for producing a multi-filament elastic yarn is crimped single yarn each other and wherein to Rukoto the profiled monofilament shape. Two Tsu sectional shape of the groove provided on the flop heating low la is multi method for producing a multi-filament elastic yarn irregular shape in which claim 1 to impart to the filament elastic yarn.   The method for producing a multifilament elastic yarn according to claim 1, wherein the heat pressing is intermittently pressurizing. Pressurized heat pressing step, the manufacturing method of the multi-filament elastic yarn according to claim 1, wherein those which are installed at an arbitrary position from the spinning yarn tube bottom in the step of spinning the polyurethane multi filament to the winding device. Pressurized heat pressing step is, after the decremental polyurethane multifilament elastic yarn from winding yarn material, manufacturing method of the multi-filament elastic yarn according to claim 1, wherein those installed in any point of the wound up again. The method for producing a multifilament elastic yarn according to claim 1, wherein the deformed shape added to the multifilament elastic yarn is at least one selected from a flat shape , a polygonal shape, a star shape, a horseshoe shape, an elliptical shape and a semicircular shape.

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