JPH09217227A - Elastic yarn for fiber separation - Google Patents

Abstract

(57) [PROBLEMS] To provide a high-quality elastic yarn for separating fibers, which is a fine denier yarn with few fineness unevenness in the yarn length direction. SOLUTION: This is a polyurethane elastic yarn in which a plurality of joined multifilaments or monofilaments are aligned and wound on one bobbin, wherein the hydrotalcite compound is 0.1 to 0.8% by weight and the metal soap is 0. .05 to 0.
5% by weight, containing 0.05 to 0.5% by weight of the modified silicon compound, and the separation stress between the joined multifilaments or monofilaments wound in parallel and aligned is 10 mg or less. Elastic thread for.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polyurethane elastic yarn which can be used in a warping machine, a covering machine, a plying machine, a core-spun spinning machine, a knitting machine, etc. while separating the fibers.

[0002]

2. Description of the Related Art Polyurethane elastic yarns obtained by subjecting an isocyanate-terminated prepolymer prepared with an organic diisocyanate and a high-molecular-weight diol to chain elongation have been known, and a foundation knitted with a polyamide fiber or a polyester fiber has been known. Socks, pantyhose,
It is used as a stretchable material in various fields such as sportswear. In the case of multi-filament, normally used polyurethane elastic yarns are made by adhering filaments with each other in a sticky state at the spinning stage so that the mutual separation stress is 100m.
It is wound by setting it to g or more, but one bobbin is wound with one spliced multifilament. In the case of a monofilament, it is not necessary to bond them, but one monofilament is wound around one bobbin.

Under such a background, the applicant of the present invention discloses a plurality of bonded multifilaments or monofilaments in Japanese Patent Application Laid-Open No. 3-59112 for the purpose of providing a polyurethane elastic yarn having high productivity and excellent separation performance. Is a polyurethane elastic yarn wound on one bobbin in a uniform manner, containing 0.01 to 0.5% by weight of metallic soap,
In addition, an elastic yarn for separating fibers has been proposed, in which the joint multifilament or monofilament wound by being aligned and wound has a mutual separation stress of 15 mg or less. However, although this elastic yarn for separating fibers has good productivity and good separation performance, it has a drawback that unevenness in fineness in the yarn length direction is likely to occur. Such fineness unevenness was serious especially for fine denier yarns.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and to provide a high-quality elastic yarn for separating fibers, which is a fine denier yarn with less fineness unevenness in the yarn length direction. And

[0005]

The present inventors have completed the present invention as a result of extensive studies to achieve the above object. That is, the present invention relates to a polyurethane elastic yarn in which a plurality of bonded multifilaments or monofilaments are aligned and wound on one bobbin, wherein the hydrotalcite compound is 0.1 to 0.8% by weight, and metal soap is used. 0.05-0.5% by weight, modified silicon compound 0.0
An elastic yarn for separating fibers, characterized by containing 5 to 0.5% by weight, and the mutual separation stress of the jointed multifilaments or monofilaments wound in parallel with each other is 10 mg or less. The elastic yarn for separating fibers is 2.5% or less. Hereinafter, the present invention will be described.

In the present invention, the term "polyurethane elastic yarn" means a polyurethane elastic yarn consisting only of urethane bonds, or a polyurethane urea elastic yarn consisting of polyurethane bonds and urea bonds. In the present invention, the joined multifilament is a multifilament which is adhered in a state where the filaments are not easily separated from each other, preferably a separation stress of 20 mg or more, more preferably 100 mg or more. When the amount is less than 20 mg, the multifilaments are easily separated from each other, and the yarn breaks in the processing step due to the single yarn breakage, which is not preferable.

The polyurethane elastic yarn of the present invention comprises a plurality of joined multifilaments or monofilaments.
It is a polyurethane elastic thread that is wound around each bobbin. Unlike the case where one spliced multifilament or monofilament is wound around one bobbin, it is excellent in productivity and the like. For example, in the case of a monofilament, by spinning 30d / 3f, three 10d / 1f yarns are spun at once, and the productivity is increased. The number is not particularly limited as long as it is 2 or more, but it is preferably 2 to 5, and more preferably 2 to 3 from the viewpoint of smoothness of the separating operation.

It is important that the polyurethane elastic yarns are aligned and wound by a guide or the like from the viewpoint of smoothness of the separating operation. In particular, with regard to the bonded multifilaments, when they are not aligned and wound by a guide, for example, when using a false twisting machine, even if the separating stress between the bonded multifilaments is 10 mg or less, they are entangled with each other by false twisting. However, there is a problem that the yarn is cut when the fiber is separated.

The polyurethane elastic yarn of the present invention comprises a hydrotalcite compound in an amount of 0.1 to 0.8% by weight, a metal soap in an amount of 0.05 to 0.5% by weight, and a modified silicone compound in an amount of 0.0.
It is important to contain 5 to 0.5% by weight. As a result, even if the elastic yarn of the present invention is a polyurethane elastic yarn in which a plurality of bonded multifilaments or monofilaments are aligned and wound on one bobbin, the elastic yarn has high quality with less fineness unevenness in the yarn length direction. It becomes an elastic thread for fibers.

In the present invention, the addition amount of the hydrotalcite compound is 0.1% based on the weight of the polyurethane polymer.
1 to 0.8% by weight is preferable, and more preferably 0.2 to
0.6% by weight. If it is less than 0.1% by weight, there is no effect of eliminating fineness unevenness, and if it is added in excess of 0.8% by weight, the stability and elastic function of spinning may be adversely affected, which is uneconomical.

Examples of the metal soap used in the present invention include combinations of metals such as lithium, calcium, magnesium, zinc and aluminum and fatty acids such as lauric acid and stearic acid. The amount of the metallic soap added is preferably 0.05 to 0.5% by weight, more preferably 0.15 to 0.35% by weight, based on the weight of the polyurethane polymer. If it is less than 0.05% by weight, the mutual separation stress of the bonded multifilament or monofilament will be 1 at the time of separation.
It is difficult to keep the amount below 0 mg, and the smoothness of the separating operation is impaired. If more than 0.5% by weight is added, in the case of multifilament, the filaments are bonded to each other in a sticky state at the spinning stage. It is not possible to wind up with the separation stress of 100 mg or more.

Examples of the modified silicone compound used in the present invention include straight chain polyether modified silicone, branched polyether modified silicone, alkyl modified silicone, amino modified silicone and the like. The amount of the modified silicon compound added is 0.05 based on the weight of the polyurethane urea polymer.
Is preferably 0.5% by weight, more preferably 0.1%.
0.3% by weight. If it is less than 0.05% by weight, it is difficult to reduce the mutual separation stress of the bonded multifilaments or monofilaments to 10 mg or less during the separation, and the smoothness of the separation operation is lacking. In the case of a multifilament, it is not possible to wind the filaments by adhering them to each other in a tacky state at the spinning stage and setting the mutual separation stress to 100 mg or more.

In the elastic yarn of the present invention, it is important that the separation stress between the joined multifilaments or monofilaments wound in parallel with each other is 10 mg or less. 1
If the amount exceeds 0 mg, the smoothness at the time of separation will be lost, and the effect of the present invention will not occur. The elastic yarn of the present invention generally has a thickness of 5 to 100 denier, but in particular, fineness unevenness is a serious problem in terms of quality 5 to 70 denier, and further 5 to 30 denier.
In the case of fine denier, the effect of the present invention can be advantageously exhibited.

The elastic yarn of the present invention has a fineness unevenness of 2.5% or less, further 2.3% or less, as measured by the method described below. Next, a method for manufacturing the elastic yarn of the present invention will be described. In the present invention, the polyurethane elastic yarn is basically a chain extender having a polyfunctional active hydrogen atom in an isocyanate-terminated prepolymer prepared by an organic diisocyanate and a substantially linear polymer diol. And those obtained by melt-spinning, dry-spinning, or wet-spinning an elastic polymer having a urethane group in the molecule obtained by reacting a terminal blocking agent having a monofunctional active hydrogen atom in one step or in multiple steps Is.

Another method for preparing the polyurethane substrate constituting the polyurethane elastic yarn is a substantially linear polymer having hydroxyl groups at both ends and a molecular weight of 400 to 5,000, and an organic diisocyanate. Is obtained by reacting a chain extender having a polyfunctional active hydrogen atom with an isocyanate-terminated prepolymer consisting of and a terminal terminator having a monofunctional active hydrogen atom while spinning.

The polymer diol, which is one of the raw materials for producing the polyurethane base material of the present invention, is a substantially linear polymer having hydroxyl groups at both ends and having a number average molecular weight of 400 to 5,000. , For example, polyoxyethylene glycol, polyoxypropylene glycol, polyoxytetramethylene glycol, polyoxypentamethylene glycol, linear or random ether-bonded copolymerized polyalkylene ether diol having 1 to 8 carbon atoms. Polyether diol; one or more dibasic acids such as adipic acid, sebacic acid, maleic acid, itaconic acid, azelaic acid and malonic acid, and ethylene glycol, 1,2-propylene glycol, 1,3-propylene glycol, 2,2-dimethyl-1,3-propanediol, 1,4 Obtained from one or more glycols such as butanediol, 1,3-butanediol, hexamethylene glycol, diethylene glycol, 1,10-decanediol, 1,3-dimethylolcyclohexane and 1,4-dimethylolcyclohexane. Examples thereof include polyester diols; or polylactone diols such as polyester amide diols, polyether ester diols, poly-ε-caprolactone diols, and polyvalerolactone diols, and polycarbonate diols.

The organic diisocyanate, which is one of the raw materials for producing the polyurethane base material of the present invention, is, for example, an aliphatic, alicyclic or aromatic diisocyanate which is dissolved or liquid under reaction conditions. All those shown are applicable.
For example, methylene-bis (4-phenyl isocyanate), methylene-bis (3-methyl-4-phenyl isocyanate), 2,4-tolylene diisocyanate,
2,6-tolylene diisocyanate, m- and p-xylylene diisocyanate, α, α, α ′, α′-tetramethyl-p-xylylene diisocyanate, m- and p
-Phenylene diisocyanate, 4,4'-dimethyl-
1,3-xylylene diisocyanate, 1-alkylphenylene-2,4 and 2,6-diisocyanate, 3-
(Α-isocyanatoethyl) phenyl isocyanate, 2,6-diethylphenylene-1,4-diisocyanate, diphenyl-dimethylmethane-4,4-diisocyanate, diphenylether-4,4′-diisocyanate, Naphthylene-1,5-diisocyanate,
1,6-hexamethylene diisocyanate, methylene-
Bis (4-cyclohexyl isocyanate), 1,3-
And 1,4-cyclohexylene diisocyanate, trimethylene diisocyanate, tetramethylene diisocyanate, pentamethylene diisocyanate, hexamethylene diisocyanate, 3,3,5-trimethyl-5-
Examples include methylene cyclohexyl diisocyanate and the like. Preferably, it is methylene-bis (4-phenyl isocyanate).

Examples of the chain extender having a polyfunctional active hydrogen atom, which is one of the raw materials for producing the polyurethaneurea base material of the present invention, include hydrazine, polyhydrazide, polyol, ethylenediamine, propylenediamine and bis- Polyamines such as (4-aminocyclohexyl) methane, m-xylylenediamine, p-xylylenediamine,
Polyols such as hydroxylamine, water and 1,4 butanediol can be used.

As the terminal terminating agent having a monofunctional active hydrogen atom, which is one of the raw materials for producing the polyurethane base material of the present invention, for example, a dialkylamine such as diethylamine is used. These chain extenders and terminal terminators may be used alone or in combination of two or more. The incorporation of the hydrotalcite compound, metal soap, or modified silicone compound of the present invention into polyurethane urea can be carried out at any stage during the production of the polyurethane polymer, but is preferably after completion of the polymerization of the polyurethane polymer.

In addition, the above polyurethane polymer composition may, if desired, be an organic or inorganic compounding agent having a specific chemical structure useful for known polyurethane polymer compositions, for example, a benzophenone compound or a benzotriazole compound. Compounds, UV absorbers such as hindered amine compounds, antioxidants such as hindered phenol compounds,
An antifungal agent; inorganic fine particles such as barium sulfate, magnesium oxide, magnesium silicate, calcium silicate, zinc oxide and the like; and an anti-adhesive agent such as polytetrafluoroethylene and the like can also be appropriately mixed.

When a plurality of spliced multifilaments are aligned and wound, as shown in FIG. 1, an air jet twisting machine 14 provided in the lower part of the spinning chamber bundles each unit in a predetermined unit and twists it, and then a stationary guide. After aligning with 6, the bobbin 11 is wound up. That is, a solution of a polyurethane polymer containing a hydrotalcite compound, a metal soap, and a modified silicone compound in polyurethane urea is press-fitted into a spinning assembly-2 attached to a spinning chamber 1. The solution is extruded from the orifice 3 of the spinneret, and the hot combustion gas introduced into the spinning chamber through the hot air inlet 4 is applied in parallel to the solution. As a result, the solvent of the polyurethane polymer is evaporated and the continuous filament 13 is formed.

The continuous filaments 13 are twisted by a twisting machine 16 attached to the outlet of the spinning chamber, and the joint multifilament 15 is formed by adjusting so that the twisting point is in the spinning chamber. The evaporated solvent is discharged from the hot air outlet 5 together with the high-temperature combustion gas, but is discharged in excess of the total amount of the high-temperature combustion gas and the evaporated solvent that are usually introduced so that the solvent does not come out of the hole in the lower part of the spinning chamber 1. More air is allowed to flow countercurrently.

The yarn temperature of the joined multifilament is adjusted by the amount of countercurrent air from the lower part of the spinning chamber, aligned by the stationary guide 6, and provided in the middle of the first goded roll 7 and the second goded roll 9. An oil agent is applied by the obtained oil agent roll 8 and wound as a fiber 11 for separating fibers by a friction roll 10. The jointed multifilament can be cooled by a cooling device after exiting from the spinning chamber and before being aligned by the stationary guide 6, as in Japanese Patent Laid-Open No. 59112. Since the hydrotalcite compound, the metal soap, and the modified silicon compound are contained in a specific weight ratio, the separation stress between the yarns, which is the target of the present invention, can be obtained without intentionally adjusting the yarn temperature of the joined multifilament. .

Similarly, when a plurality of monofilaments are aligned and wound, it is also preferable to wind them on one bobbin 11 after aligning them by the stationary guide 6 as shown in FIG. In the case of monofilament, the air jet twisting machine is unnecessary. According to the present invention, fine denier yarns can be produced all at once at a normal spinning speed.
Increases production efficiency. And this tendency becomes remarkable as the denier becomes finer.

When producing the polyurethane elastic yarn of the present invention, it is important to align and wind it with a guide or the like regardless of whether it is a bonded multifilament or a monofilament. When a guide is used, the material of the guide is preferably a ceramic guide such as alumina or titanium from the viewpoint of preventing yarn breakage due to frictional resistance.

[0026]

DETAILED DESCRIPTION OF THE INVENTION The present invention will be described in more detail with reference to Examples, but it should not be construed that the invention is limited thereto. Moreover, the measuring method of the characteristic value in an Example is shown below. (Elongation at break) Tensile tester (U manufactured by Orientec Co., Ltd.)
TM-III-100) at 20 ° C and 65% RH atmosphere.
It breaks at a strain rate of 1,000% / min, and measures the strength and elongation at break.

(Separation stress) Using a tensile tester (Model UTM-III-100 manufactured by Orientec Co., Ltd.), 20 ° C., 6
Performed in a 5% RH atmosphere. The separation stress of a plurality of bonded multifilaments or a plurality of monofilaments is measured by first separating one bonded multifilament or a monofilament in the length direction and gripping it in a clamp of a tensile tester at a speed of 50 cm / min. The separation is performed and the stress required for the separation is measured.

The separation stress in one joined multifilament was obtained by carefully rubbing the cut portion of the yarn, taking out the single yarn, and holding the single yarn and the remaining portion in the clamp of the tensile tester 50c.
The fibers are separated at a speed of m / min, and the stress required for the separation is measured. (Separability of the splitting yarn during running) The elastic yarn for splitting is brought into contact with the delivery roll, the yarn is pulled out from this, the yarn is split, and the split yarn is rewound onto the bobbin which is brought into contact with the winding roll.

On the way, the angle (θ) formed between the separated yarn and the yarn provided with a snell guide is set to 10 °, the yarn is fed at 150 m / min, and wound at 225 m / min for 10 minutes. Measure the number of times to check the smoothness of the separation process. (Difference in fineness; U%) U% EVENN manufactured by Keisokuki Kogyo
Measured with ESS TESTER Type C.

[0030]

Examples 1 to 3 and Comparative Examples 1 to 5 <Preparation example of polyurethane solution> Number average molecular weight 1,200
Polytetramethylene glycol of 1,000 g (parts by weight, the same hereinafter) and 312 g of methylene-bis (4-phenylisocyanate) were reacted with stirring in a nitrogen gas stream at 95 ° C. for 90 minutes to leave an isocyanate group residue. A base prepolymer was obtained. Next, after cooling to room temperature, 2,360 g of dry dimethylformamide was added and dissolved to obtain a prepolymer solution.

On the other hand, 23.4 g of ethylenediamine and 3.7 g of diethylamine were dissolved in 1,570 g of dry dimethylformamide, and the prepolymer solution was added thereto at room temperature to give a polyurethane solution having a viscosity of 1,200 poise (30 ° C.). Got The viscous polymer solution thus obtained was added to the polymer solid content% by weight (hereinafter the same), 4,
4'-butylidene-bis (3-methyl-6-t-butylphenol) 2%, 2- (2'-hydroxy-3'-t
A solution containing 0.7% of -butyl-5'-methylphenyl) -5-chloro-benzotriazole is used as the spinning dope.

The spinning dope was mixed with the additives shown in Table 1 and degassed in a vacuum, and then extruded from a nozzle having a diameter of 0.2 mm and a number of holes of 6 at 260 ° C. into a spinning chamber in which a combustion gas was flowed, and an air jet twisted yarn at the bottom of the spinning chamber. Bunch two by the machine and twist 3
A book of 20 denier / 2 filament spliced multifilaments was formed and wound at a speed of 500 m / min. Table 1
The symbols inside are as follows: DHT: hydrotalcite compound, StMg: magnesium stearate, S-
E-Si: branched polyether modified silicone, LE-
Si: Polyether modified silicone at both ends of the molecule, AS
i: represents amino-modified silicon.

Table 1 shows the tenacity and elongation of the obtained 20d yarn, the separation stress between the joined multifilaments 20d, the separation stress between the single yarns in the joined multifilament, and the separating property of the split yarns during running. As shown in Table 1, the addition of the hydrotalcite compound eliminates the fineness unevenness in the yarn length direction, and the combined use of metal soap and modified silicon causes the separation stress between single yarns in the joined multifilament to be aligned without decreasing. It can be seen that the separation stress between the joined multifilaments that have been wound up can be reduced to facilitate the separation.

[0034]

Example 4 and Comparative Example 6 The additives shown in Table 2 were added to a spinning dope, and after defoaming in vacuum, a denier of 10 denier was extruded from a nozzle having a bore of 0.2 mm and a hole number of 4 to a spinning chamber at which a combustion gas of 260 ° C. was flown. 4 yarns are formed, and two monofilaments are drawn out by a stationary guide, 2 at a speed of 500 m / min.
I wound it up on a bobbin.

Table 2 shows the tenacity and elongation of the obtained fiber, the separation stress between the aligned monofilaments, and the separating property of the split yarn during running. As shown in Table 2, even after the passage of time, the smooth separation property was excellent.

[0036]

[Table 1]

[0037]

[Table 2]

[0038]

The polyurethane urea elastic yarn of the present invention is
By containing a hydrotalcite compound, a metal soap, and a modified silicone compound, an elastic yarn for separating fibers in which the separation stress between the bonded multifilaments or monofilaments wound in parallel on one bobbin is 10 mg or less is provided. .

[Brief description of drawings]

FIG. 1 is a schematic view showing an example of an apparatus for producing an elastic yarn for separating multi-filament of the present invention.

FIG. 2 is a schematic view showing an example of an apparatus for producing an elastic yarn for separating monofilaments of the present invention.

FIG. 3 is a schematic view of a separation test apparatus of the present invention.

[Explanation of symbols]

 1 Spinning Chamber 2 Spinning Assembly 3 Orifice 4 Hot Air Inlet 5 Hot Air Outlet 6 Stationary Guide 7 First Godet Roll 8 Lubricant Roll 9 Second Godet Roll 10 Friction Roll 11 Elastic Fiber for Splitting 12 Continuous Filament 13 Bonding Multifilament 14 Twisting Machine 15 Sending Roll 16 bobbin 17 winding roll 18 snell guide

Claims (2)

[Claims] 1. A polyurethane elastic yarn in which a plurality of joined multifilaments or monofilaments are aligned and wound on one bobbin, wherein the hydrotalcite compound is 0.1 to 0.8% by weight and the metal soap is 0.05-0.
5% by weight, containing 0.05 to 0.5% by weight of the modified silicon compound, and the separation stress between the joined multifilaments or monofilaments wound in parallel and aligned is 10 mg or less. Elastic thread for. 2. The elastic yarn for separating fibers according to claim 1, wherein the fineness unevenness is 2.5% or less.