JP3920087B2 - Separating polyester filament and method for producing the same - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a polyester multifilament, a polyester filament for splitting, which becomes a parent yarn capable of producing a polyester crimped monofilament with good dyeability by post-drawing stretch false twisting and splitting, and It relates to a manufacturing method.
[0002]
[Prior art]
When producing a polyester crimped monofilament, as described in JP-A-56-31011, a highly oriented semi-unstretched yarn is subjected to simultaneous false twisting and then divided into individual filaments. Using a manufacturing method is effective from the viewpoint of productivity. Further, the false twisting method at that time is disclosed in Japanese Patent Laid-Open Nos. 55-98922 and 56-9434.
[0003]
At present, needs for crimped monofilaments with good dyeability are increasing due to diversification of consumer needs. As a cationic dye-dyeable polyester fiber, a fiber obtained by copolymerizing an aromatic dicarboxylic acid component containing a sulfonate group typified by 5-sodiumsulfoisophthalic acid as a dyeing seat for a cationic dye in polyester is disclosed in JP-B-34. -10497 publication. Such a cationic dye-dyeable polyester fiber can express a vivid color by dyeing.
[0004]
However, in order to improve dyeability, when the above aromatic dicarboxylic acid components are copolymerized, the thermal stability at the time of spinning becomes insufficient, and the viscosity of the polymer is reduced at the melt spinning stage. Since the meterability at the spinneret is deteriorated, the fineness difference between single yarns of the multifilament yarn is increased. When such a multifilament is split, the difference in fineness between monofilaments increases. Moreover, tension fluctuations occur in the fiber separation process, causing stepping or further worsening, which causes troubles such as frequent yarn breaks.
[0005]
In this way, multi-filament yarns for splitting that can be used for simultaneous stretching of undrawn polyester filaments that can be used for splitting without causing troubles and that can provide crimped monofilaments with high dyeability. (Parent yarn) has not been proposed.
[0006]
[Problems to be solved by the invention]
The present invention solves the above-mentioned problems, is a highly oriented unstretched polyester filament that has good dyeability and uniform single yarn fineness and can be stretched simultaneously false twisted, and in subsequent splitting processing An object of the present invention is to provide a polyester filament for splitting that has good process passability and is capable of obtaining a high-quality crimped monofilament.
[0007]
[Means for Solving the Problems]
As a result of investigations to solve the above problems, the present inventors have reached the present invention. That is, the gist of the present invention is the following (A) and (B).
(A) The sulfonate group-containing compound (A), adipic acid (B), and polyethylene glycol (C) having a molecular weight of 400 to 10000 satisfy any one of the following conditions (1) to (3). Made from polyethylene terephthalate copolymerized with a single yarn fineness of 20-40 dtex, 6-16 filaments, CV% of single yarn fineness of 3% or less, and birefringence index Δn of 20 × 10 ⁻³ or more and 60 × 10 ^{− A} polyester filament for splitting, which is ³ or less.
However, CV% (%) of single yarn fineness = (V / X) × 100 V: square root of unbiased dispersion of all single yarn fineness constituting polyester filament X: average value of all single yarn fineness constituting polyester filament (1 A + B + C
However, A = 1.0-5.0 mol% B = 1.0-5.0 mol% C = 0.5-3.0 mass%
(2) A + B
However, A = 1.0-5.0 mol% B = 1.0-8.0 mol%
(3) A + C
However, A = 1.0-5.0 mol% C = 0.5-5.0 mass%
(B) A polyester having a melt viscosity (measured at 280 ° C. and a shear rate of 1000 / S) of 170 pa · s or more is provided with at least an orifice of a measuring plate for introducing a polymer into one nozzle hole of the nozzle plate. The method for producing a polyester filament for splitting according to (a), wherein melt spinning is performed using a cap apparatus provided with two or more caps.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail.
[0009]
The polyester filament of the present invention comprises PET obtained by copolymerizing PET with adipic acid (B) and / or polyethylene glycol (C) having a molecular weight of 400 to 10,000 in addition to the sulfonate group-containing compound (A). . By using (B) and (C) alone or in combination with (A), the dyeing property with a cationic dye, particularly at normal pressure, is excellent.
[0010]
First, the sulfonate group-containing compound has a dyeing seat that reacts with a cationic dye to develop a color, and as the content increases, a larger amount of the dye is fixed in the fiber and exhibits better color developability. The amount of the sulfonate group-containing compound needs to be 1.0 to 5.0 mol%. If the content is less than 1.0 mol%, it is difficult to develop good color developability. Further, if the content exceeds 5.0 mol%, the polyester thermal stability of the polyester is deteriorated, so that the melt viscosity is lowered, and the polyester filament having a small single yarn fineness variation (CV%) intended in the present invention is obtained. Not only can it not be obtained, but the fiber strength is lowered and the operability during spinning is also deteriorated. Although it does not specifically limit as a sulfonate group containing compound (A), 5-sodium sulfo isophthalic acid (henceforth SIP) is preferable.
[0011]
Adipic acid and polyethylene glycol contained in the filament of the present invention increase the amount of dye adsorbed into the fiber by increasing the inside of the polyester polymer and increasing the diffusibility of the dye. The effect can be exhibited particularly when dyeing at normal pressure, and color development equivalent to that of normal pressure dyeing can be obtained. Adipic acid and polyethylene glycol may be used alone or in combination.
[0012]
The copolymerization amount of adipic acid is 1.0 to 5.0 mol% in the case of (1) containing a sulfonate group-containing compound, adipic acid and polyethylene glycol, and the sulfonate group-containing compound and adipic acid In the case of (2) containing, it is 1.0 to 8.0 mol%. If it is less than 1.0 mol%, the effect of improving dyeability is not observed. On the other hand, if the upper limit is exceeded, the spinnability deteriorates, and it is not possible to obtain a polyester filament having a small variation in single yarn fineness (CV%) as intended in the present invention, but also the strength of the fiber is lowered.
[0013]
Polyethylene glycol needs to have a molecular weight of 400 to 10,000. When the molecular weight exceeds 10,000, polyester is not completely copolymerized and is present free in the polymer, which is not preferable because the dye diffusion effect is poor. On the other hand, if the molecular weight is less than 400, the melt viscosity of the whole polyester is lowered, and not only a polyester filament with a small variation in single yarn fineness (CV%) targeted in the present invention can be obtained, but also the fiber strength is lowered, This may unfavorably affect the physical properties of the fiber, such as deteriorating the heat resistance of the fiber.
[0014]
The copolymerization amount of polyethylene glycol is 0.5 to 3.0% by mass in the case of (1) containing a sulfonate group-containing compound, adipic acid and polyethylene glycol, and the sulfonate group-containing compound and ethylene glycol. In the case of (3) containing, the content is 0.5 to 5.0% by mass. If it is less than 0.5% by mass, the effect of improving dyeability is not observed. On the other hand, if the upper limit is exceeded, the spinnability deteriorates, and it is not possible to obtain a polyester filament having a small variation in single yarn fineness (CV%) as intended in the present invention, but also the strength of the fiber is lowered.
[0015]
Further, in the copolymerized PET forming the fiber of the present invention described above, a matting agent, pigment, flameproofing agent, deodorant, light stabilizer, heat stabilizer, antioxidant, crystal, if necessary Various additives such as a crystallization accelerator may be added within a range that does not impair the object of the present invention.
[0016]
Next, the polyester filament of the present invention needs to have a single yarn fineness of 20 to 40 dtex. If the single yarn fineness is less than 20 dtex, it is not practical when the final monofilament is obtained. On the other hand, if the single yarn fineness exceeds 40 dtex, the operability deteriorates due to poor cooling during spinning, and fusion between single yarns is likely to occur, and the post-drawing draw-twisting and splitting steps The thread breakage frequently occurs at.
[0017]
Furthermore, from the viewpoint of the spinnability of the polyester filament and the post-processing drawing false twisting step, handling property and operability in the splitting step, the number of single yarns of the polyester filament needs to be 6 to 16, more preferably 8-12. If the number is less than 6, it is not preferable because the production efficiency at the time of splitting the crimped monofilament is poor. On the other hand, if it exceeds 16, the cooling performance at the time of spinning deteriorates, and the splitting process becomes complicated, which is not preferable. In order to obtain the configuration as described above, the total fineness of the polyester filament is preferably 120 to 500 dtex.
[0018]
Further, the birefringence of the polyester filament of the present invention is such that Δn is 20 × 10 ^−3.
It is necessary to make it ˜60 × 10 ⁻³ . In order to obtain such a polyester highly oriented undrawn yarn, the spinning speed at the melt spinning stage may be 3000 to 4000 m / min. Δn is less than 20 × 10 ⁻³ , that is, when the orientation degree of the polyester filament is low, the fineness unevenness in the filament longitudinal direction is increased in the subsequent drawing false twisting process, or the change with time of the polyester filament is increased. It is not preferable for the reason.
[0019]
On the other hand, if Δn exceeds 60 × 10 ⁻³ , it is necessary to increase the spinning speed, the spinning operability is deteriorated, and it is necessary to increase the single hole discharge amount of the spinneret. The operability is extremely deteriorated due to an increase in the draft ratio to the yarn. Further, it is not preferable because it is difficult to impart crimp fastness in the subsequent drawing false twisting process and a change with time of the crimp tends to occur.
[0020]
And it is important that CV% of the single yarn fineness which comprises the polyester filament of this invention shall be 3% or less. CV% of single yarn fineness is an index indicating variation in single yarn fineness. When the CV% exceeds 3%, there are large variations, resulting in problems such as deterioration in the splitting property in the splitting process and an increase in the fineness difference of the crimped monofilament after splitting.
[0021]
As described above, in the present invention, in addition to the improvement of dyeability (cationic dyeing), the objective is to obtain a monofilament that is also excellent in cationic dyeability at normal pressure. In addition, after copolymerizing adipic acid and / or polyethylene glycol, it is important to obtain a polyester filament having a CV% of single yarn fineness of 3% or less.
[0022]
Next, the manufacturing method of the polyester filament for splitting of this invention is demonstrated. FIG. 1 is a schematic process diagram showing one embodiment of the production method of the present invention. As shown in FIG. 1, polyester chips are supplied to a melt extruder, melt-kneaded at a spinning temperature of 280 to 310 ° C., spun as 6 to 16 single yarns from the die unit 1, converted into yarn Y, and cooled. It can be obtained by cooling with the apparatus 2 and applying the spinning oil agent with the oil agent applying apparatus 3 and then scraping it as a package 6 with the take-up machine 5 through a pair of godet rollers 4 at 3000 to 4000 m / min. it can.
[0023]
The polyester used in the present invention has a melt viscosity at the time of spinning of 170 pa · s or more in order to reduce the variation in the single yarn fineness of the polyester filament in order to improve the meterability inside the die apparatus. As the melt viscosity of the polyester decreases, the meterability at the time of passing through the inside of the spinneret and at the time of discharging from the base becomes worse, and it becomes difficult to reduce the variation CV% in the single yarn fineness.
[0024]
The base device 1 to be used has a measuring plate 7 and a nozzle plate 8 overlapped as shown in FIG. 2 and has two or more, preferably 3 to 4 orifices in the measuring plate 7 for one nozzle hole 10. A configuration is preferable. Since the molten polyester is discharged from the plurality of orifices of the measuring plate 7 in this way, it can be supplied to each nozzle hole 10 through the introduction groove 11 with good metering properties. Therefore, the amount of polymer discharged from each nozzle hole 10 varies. Can be suppressed, and a multifilament having a small variation in single yarn fineness can be obtained.
[0025]
The diameter of the orifice discharge hole 9 is preferably about 0.3 to 1.0 mm from the viewpoint of meterability during discharge and pressure loss applied to the cap apparatus 1.
[0026]
As described above, by specifying the melt viscosity of the polyester and the base unit during spinning, when the molten polyester passes through the base unit, the meterability is improved and the variation in the single yarn fineness is reduced. It becomes possible to do. As a result, the polyester filament of the present invention is copolymerized with a sulfonate group-containing compound, which is a third component, adipic acid, polyethylene glycol, etc., and has poor thermal stability during melt spinning compared to homopolyester. In spite of this, it is possible to make multifilaments with little variation between single yarn finenesses, and to obtain crimped monofilaments that have excellent processability in the subsequent drawing false twisting and splitting process and that have stable quality and high color development. It becomes possible.
[0027]
【Example】
Next, the present invention will be specifically described by way of examples. In addition, the measuring method of the characteristic value in an Example is as follows.
(A) The intrinsic viscosity sample was dissolved in a mixed solvent of phenol / tetrachloroethane (mass ratio 50:50) and measured at 20 ° C. using an Ubbelohde viscometer.
(B) Single yarn fineness After the polyester filament was cut to a length of about 10 cm, it was divided for each single yarn, and all single yarn finenesses were measured using DENIIR COMPUTER DC-11 manufactured by Search. The single yarn fineness in Table 1 was the average of all single yarns.
(C) Single yarn fineness CV%
It calculated | required from the single yarn fineness measured by (b).
Single yarn fineness CV% (%) = (V / X) × 100
V: square root of unbiased dispersion of all single yarn fineness constituting the polyester filament X: average value of all single yarn fineness constituting the polyester filament (d) birefringence Δn
The obtained filament was measured by a Belek Compensator method using a POE polarizing microscope.
(E) Measurement was performed using a flow tester CFT500 manufactured by Shimadzu Corporation under conditions of a melt viscosity temperature of 280 ° C. and a shear rate of 1000 / S.
(F) Crimpability The obtained multifilament is transferred to a false twisting machine ST-5 (false twist conditions: false twist number 2100 T / M, false twist temperature 185 ° C., draw ratio 1.51, yarn speed 150 m / min). Stretch false twisting was performed, and the state after false twisting was visually evaluated in two stages as follows.
○ ・ ・ ・ Good expression of crimp.
×: Crimp expression is poor, and crimp is not expressed partially or entirely.
(G) The processed yarn after having been stretched false twisted with the splitting property (f) was split with a series of splitting machines. Using 100 processed yarns (100 packages), the fullness of the crimped monofilament after splitting was evaluated in two stages as follows.
○ ・ ・ ・ Fullness rate 85% or more × ・ ・ ・ Fullness rate Less than 85% (h) Crimped monofilaments obtained with dyeability (g) are knitted, and dye is DiacrylBlackRTL-PF 0.51wf, level dyeing Acetic acid 0.3 ml / l was used as an agent, and dyeing was performed using a MINI-COLOR dyeing machine manufactured by Teksam Giken Co., Ltd. at a temperature of 100 ° C. for 30 minutes, and visual evaluation was performed by 10 panelists. The number of persons judged to have good dyeability was scored, and 7 or more were scored as acceptable.
[0028]
[0029]
[0030]
[0031]
[0032]
Example 4
As a sulfonate group-containing compound, a 2.0 mol% SIP, 2.5 mol% adipic acid, 2.0 mass% polyethylene glycol having a molecular weight of 6000 is copolymerized, and a PET chip having a melt viscosity of 210 pa · s is melted at 300 ° C. After the melting, the base device composed of the measuring plate (number of orifices: 4, orifice discharge hole diameter: 0.5 mm) and nozzle plate (number of nozzle holes: 10 holes, discharge hole diameter: 0.8 mm) shown in FIG. used. As shown in the schematic cross-sectional view in the XX ′ direction of FIG. 2 in FIG. 3, the number of orifices in the measuring plate is the number provided for one nozzle hole in the nozzle plate. Using such a die apparatus, melt discharge was performed at a discharge rate of 115 g / min, and spinning and winding were performed according to the process diagram shown in FIG. First, after the spun yarn was cooled, an oil agent was applied, and polyester filaments having a total fineness of 330 dtex and 10 filaments were scraped off at a speed of 3500 m / min. Table 2 shows the evaluation results of the birefringence, CV% of single yarn fineness, crimpability, splitting properties, and dyeability [dyed by the method described in (h)] of the obtained polyester filament.
[0033]
Examples 5-10, Comparative Examples 7-15
The molecular weight of polyethylene glycol, SIP, adipic acid, the amount of polyethylene glycol copolymerization, the melt viscosity of the copolyester, the number of orifices of the measuring plate of the nozzle used, the single filament fineness of the polyester filament, and the number of filaments are as shown in Table 2. The same operation as in Example 4 was performed except for the change. Table 2 shows the evaluation results of the birefringence, CV% of single yarn fineness, crimpability, fineness, and dyeability (dyed by the method of 2) of the obtained polyester filament.
[0034]
[Table 2]
[0035]
As is apparent from Table 2, the filaments of Examples 4 to 10 are made of polyester obtained by copolymerization of an appropriate amount of SIP, adipic acid and polyethylene glycol, and the variation in single yarn fineness is small. (Crimping and splitting properties) were good, and dyeability with a cationic dye at normal pressure was also excellent. On the other hand, since the filament of Comparative Example 7 had a small copolymerization amount of SIP, adipic acid, and polyethylene glycol, good dyeability could not be obtained. Since the filament of Comparative Example 8 had too much copolymerization of adipic acid and polyethylene glycol, the filaments of Comparative Examples 9 and 10 had too much copolymerization of SIP, so the filament of Comparative Example 11 was copolymerized with polyethylene glycol. Since the polymerization amount was too large, filaments with large variations in single yarn fineness were obtained, and the operability during splitting was poor. Since the filament of Comparative Example 12 had a large single yarn fineness and a low birefringence, the variation in the fineness of the filament in the length direction in the drawing false twisting process was large, crimping was non-uniform, and operation during splitting The sex also deteriorated. Since the filament of Comparative Example 13 was copolymerized with polyethylene glycol having a low molecular weight, the melt viscosity of the whole polyester was lowered, the variation in single yarn fineness was large, and the operability during splitting was poor. The filament of Comparative Example 14 is a copolymer of polyethylene glycol having a high molecular weight, and has a high birefringence. Therefore, the crimp expression in the drawing false twisting process is poor and the dyeability is also poor. It was. In Comparative Example 15, since the number of filaments was large, adhesion occurred between single yarns at the time of spinning, cutting yarns occurred frequently, and filaments could not be obtained.
[0036]
【The invention's effect】
Since the polyester filament of the present invention has good dyeability and uniform single yarn fineness, it has good post-process passability such as stretch false twisting and splitting, and has high quality crimped monofilament. Can be obtained. The polyester filament of the present invention is excellent in cationic dyeability at normal pressure. And according to the manufacturing method of this invention, it becomes possible to obtain the polyester filament for splitting of this invention with sufficient operativity.
[Brief description of the drawings]
FIG. 1 is a schematic process diagram showing one embodiment of a method for producing a polyester filament for splitting according to the present invention.
FIG. 2 is a schematic view showing one embodiment of a measuring plate and a nozzle plate of a base device used in the production of a polyester filament for fiber separation according to the present invention.
FIG. 3 is a schematic cross-sectional view in the XX ′ direction of FIG. 2;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Base apparatus 2 Cooling apparatus 3 Oil agent providing apparatus 4 Godet roller 5 Trimmer 6 Package 7 Measuring plate 8 Nozzle plate 9 Orifice discharge hole 10 Nozzle hole 11 Introducing groove Y Yarn

Claims (2)

A sulfonate group-containing compound (A), adipic acid (B), and polyethylene glycol (C) having a molecular weight of 400 to 10,000 are copolymerized so as to satisfy any one of the following conditions (1) to (3). Made of polyethylene terephthalate, having a single yarn fineness of 20 to 40 dtex, 6 to 16 filaments, CV% of single yarn fineness of 3% or less, and birefringence Δn of 20 × 10 ⁻³ or more and 60 × 10 ⁻³ or less. A polyester filament for splitting, characterized by being.
However, CV% (%) of single yarn fineness = (V / X) × 100 V: square root of unbiased dispersion of all single yarn fineness constituting polyester filament X: average value of all single yarn fineness constituting polyester filament (1 A + B + C
However, A = 1.0-5.0 mol% B = 1.0-5.0 mol% C = 0.5-3.0 mass%
(2) A + B
However, A = 1.0-5.0 mol% B = 1.0-8.0 mol%
(3) A + C
However, A = 1.0-5.0 mol% C = 0.5-5.0 mass%  Polyester having a melt viscosity (measured at 280 ° C. under a shear rate of 1000 / S) of 170 pa · s or more, at least two orifices of the measuring plate for introducing the polymer into one nozzle hole of the nozzle plate The method for producing a polyester filament for fiber separation according to claim 1, wherein melt spinning is performed using a cap apparatus provided.