JPH0482931A - Production of combined filament yarn - Google Patents

Abstract

PURPOSE:To produce the subject combined filament yarn in high process stability while scarcely forming foreign material on the surrounding of a polyamide spinning nozzle hole by extruding a polyamide containing an Mg compound, etc., as a metallic component and a polyester in molten state. CONSTITUTION:The objective combined filament yarn can be produced by extruding a polyester and a polyamide in molten state from separate extrusion nozzles distributed on the surface of the same spinneret. The polyamide used in the above process contains 10-1,000ppm (based on the polyamide) of at least one kind of compound selected from Mg compounds, Al compounds and Co compounds as a metallic component.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a method for producing a mixed fiber yarn consisting of polyester filaments and polyamide filaments. More specifically, the present invention relates to a method for producing the mixed fiber yarn, which has excellent process stability with little generation of foreign matter around polyamide spinning holes.

(Prior art) Conventionally, in order to obtain heathered fibers, kneaded silk fibers, highly drapeable fibers, etc., mixed yarns made by mixing filaments made of different polymers, especially mixed fibers made of polyamide filaments and polyester filaments, have been used. Many fibers have been proposed.

Such a mixed fiber yarn consisting of multiple components utilizes the excellent properties of different polymer components, but the manufacturing method thereof is as follows: (1) using two or more already completed yarns, (2) A method of mixing two or more types of yarns by heating them during drawing/false twisting; (3) A method of mixing two or more types of yarns after opening with a nozzle etc. A method is known in which a mixed filament is obtained by spinning yarns from separate discharge holes distributed in a mixed manner on the same spinneret surface. However, method (1) requires an extra process, resulting in high costs and the disadvantage that the yarn is easily damaged, and method (2) is also limited in the setting of materials and stretching conditions. In addition, there is a drawback that the relative positions of each filament tend to be biased.

On the other hand, method (3) is cost-effective;
Furthermore, since it is easy to obtain uniform mixed fiber yarns, it is practiced on an industrial scale.

On the other hand, the different polymers constituting the mixed yarn are
Many combinations of polyester and polyamide have been proposed from the viewpoints of physical properties, dyeing properties, aesthetics, and industrial availability.

However, when producing a mixed yarn consisting of polyester meilamen 1~ and polyamide filaments by the method (3) above, compared to spinning polyester alone or spinning polyamide alone,
- There is a problem that the spinnability decreases with increasing steps.

That is, within a short time after the start of melt spinning, blackish brown foreign matter is deposited around the polyamide spinning holes. Although the cause is not clear, the degree of foreign matter precipitation is accelerated compared to spinning polyamide alone, probably due to the interaction of sublimed foreign matter (catalyst/monomer) from polyester. This induces bending of the discharged yarn, and eventually spinning itself becomes impossible. If this licking or bending due to foreign matter begins to occur, it becomes necessary to replace the spinneret, which significantly impedes productivity.

In order to solve these problems, conventional methods have been used to improve the release properties of the polymer stream from the spinneret surface. Although various methods have been tried, such as investigation and investigation of the spinning hole shape, the reality is that the effects are still not necessarily sufficient.

Additionally, if polyamide is spun alone, the generation of foreign matter can be suppressed by steam-sealing the area around the spinning hole, but since polyester and polyamide are being spun at the same time, the steam-sealing around the spinning hole can be suppressed. If this is done, the polyester will be hydrolyzed, leading to a decrease in the strength and elongation of the blended yarn, resulting in poor workability.

(Problems to be Solved by the Invention) The present invention has been made in view of the above-mentioned prior art, and its purpose is to reduce the generation of foreign matter around the polyamide spinning hole, improve productivity and operability, and improve the productivity and operability. The present invention provides a method for producing a mixed fiber yarn consisting of polyester filaments and polyamide filaments that are respectively discharged from separate spinning holes.

(Means for Solving the Problem) The present inventors have conducted intensive studies on foreign matter around the spinning holes when polyester and polyamide are melted and discharged from separate spinning holes of the same spinneret, and have found that There is a close relationship between foreign matter and the occurrence of bending in the discharged yarn, and if the foreign matter around the polyamide spinning hole is reduced, bending will not occur and stable spinning will be possible for a long time.Also, foreign matter around the spinning hole is caused by the heat generated when polyamide melts. It was discovered that it consists of a copolymerized/crosslinked product of a decomposed product and a polyester monomer. Furthermore, based on these findings, the present inventors continued intensive research and found that if polyamide containing specific amounts of magnesium compounds, aluminum compounds, or cobalt compounds was used, the generation of foreign matter around the polyamide spinning holes was significantly reduced. The inventors have discovered that spinning can be performed stably for a long period of time without bending of the ejected yarn, and have arrived at the present invention.

That is, according to the present invention, when producing a mixed fiber yarn by melting and discharging polyester and polyamide from separate discharge holes distributed on the same spinneret surface, a magnesium compound, an aluminum compound, and a cobalt compound are used as the polyamide. At least one compound selected from compounds has a metal content of 10 to 100
011p111 (relative to polyamide) A method for producing a mixed fiber yarn is provided, characterized in that it uses a polyamide containing (relative to polyamide).

The polyester used in the present invention comprises terephthalic acid or its ester-forming derivative and the formula HO(CHz)p
o Polymethylene glycol represented by H (where p is an integer of 2 to 10) according to a conventional method, and in particular polyethylene terephthalate produced from dimethyl terephthalate and ethylene glycol or tetramethylene glycol. Or polytetramethylene terephthalate is suitable.

If desired, in the production of the above polyester,
Other glycols or other esters or oxycarboxylic acids may be added to the reaction mixture in amounts up to about 15 mole percent, based on the total acid component. Examples of compounds that can be added include dibasic acids such as sodium 3,5-dicarboxybenzenesulfonate, adipic acid, sebacic acid, isophthalic acid, diphenylsulfone dicarboxylic acid, naphthalene dicarboxylic acid, and oxybenzoic acid as acid components; One or more compounds selected from acids; the glycol component is, for example, one or more compounds selected from trimethylene glycol, propylene glycol, cyclohexane dimetatool, neopentyl glycol, etc. . Of course, the above copolymerized polyester contains polymethylene terephthalate units within 85 mol%,
Needless to say, it may be mixed with other polyesters, and may also contain titanium oxide as a matting agent.

The other component polyamide used in the present invention contains 10 to 1000 ppIll, preferably 40 to 100 ppn of at least one compound selected from magnesium compounds, aluminum compounds, and cobalt compounds as a metal content based on the polyamide. That is essential. Although the details of the effects of these compounds are still unknown, they are thought to be as follows.

Polyamide undergoes a deammonification reaction of amino terminal groups or a pyrrole ring formation reaction between melting and discharge.
Three-dimensional or high-molecular-weight foreign matter precipitates around the spinning holes, and also reacts with the actual sublimated material from polyester.
It is presumed that the growth of this foreign substance is promoted by crosslinking. And the above-mentioned magnesium compound and aluminum compound.

The cobalt compound etc. forms an ionic bond or a complex bond with the amino terminal group of the polyamide to suppress the deammonia reaction and pyrrole ring formation reaction of the amino group, and as a result, the precipitation of foreign substances around the spinning holes is reduced. It is estimated to be.

Therefore, if the content of these compounds is too small, the above effects will be insufficient, and if the metal content is less than 10 pp1 based on the polyamide, the object of the present invention cannot be achieved. On the other hand, if it exceeds 11,000 pp, the melt viscosity of the polyamide becomes too high and the spinning stability decreases, which is not preferable.

Examples of such metal compounds include fatty acid salts of magnesium, aluminum and cobalt such as acetates and stearates, and halides such as chlorides and iodides.

These may be used alone or in combination of two or more. The method of incorporating these metal compounds into polyamide is not particularly limited, and they may be added at any stage during polymerization of polyamide, or may be triblended with polyamide chips during melt spinning. .

The polyamide used in the present invention is not particularly limited, and includes nylon 4, nylon 6, nylon 6.6, nylon 7, nylon 6.10, nylon 11, nylon 12, bis(
p-aminocyclohexyl)methane and 1,10-decamethylene dicarboxylic acid or 1,9-nonamethylene dicarboxylic acid and 15 mol% in said polyamide
A copolymer of less than or equal to the third component, a copolymer of two or more of these, or a mixture thereof can be used.

Among them, nylon 6 is preferred.

Note that the polyamide may also be mixed with additives such as a matting agent, an antistatic agent, and a light resistance/heat resistance improving agent.

In the present invention, the ratio of the total denier of the polyester filaments and the total denier of the polyamide filaments constituting the mixed yarn can be arbitrarily selected within the range of 20:80 to 80:20, and The single fiber fineness of the filament can also be selected arbitrarily. Among these, it is more preferable to set the total denier ratio to 30 nia 0 to 70:30 and the ratio of the respective single fiber finenesses to 1:3 to 3:1 from the viewpoint of improving the stability of spinning and drawing. If a wider range of fineness ratios is desired, spinning and blending with a split type composite filament may be performed as shown in Japanese Patent Publication No. 63-39688.

Further, the cross-sectional shapes of the polyester filament and the polyamide filament can also be selected arbitrarily, and may be the same shape or different shapes.

(Effects of the Invention) As detailed above, according to the method of the present invention, not only the precipitation of foreign substances in the spinning holes during spinning is suppressed and the process stability is improved, but also the quality of the obtained mixed fiber yarn is improved. Since the properties are also improved, the occurrence of fuzz, yarn breakage, etc. during knitting and weaving is reduced, and extremely high-quality woven and knitted fabrics can be obtained.

(Example) The present invention will be specifically described below with reference to Examples, but the present invention is not limited thereto.

Example 1 Aluminum acetate was dry chip blended with nylon 6 having an intrinsic viscosity of 1.32 in m-cresol at 35°C and an amino end group concentration of 60 equivalents/ton to give an AI of 3 sppm. and polyethylene terephthalate having an intrinsic viscosity of 0.64 in Q-talolos enol at 35° C., 12 peripheral rows.

Using a two-circle spinneret having 24 inner circumferential rows of spinning holes,
Polyethylene terephthalate is melted and discharged from the inner row spinning holes and nylon 6 is melted and discharged from the outer row spinning holes at a spinning temperature of 270°C.
), an undrawn yarn was obtained at a speed of 810 m/min, and then the drawing speed was 400 m/min, the drawing temperature was 50°C, and the drawing ratio was 2.
．． A drawn yarn of 50 denier/36 filaments was obtained by drawing at a factor of 7. The single fiber fineness of the polyethylene terephthalate filament was approximately 1 denier and the cross-sectional shape was Y-shaped, and each of the square nylon 6 was approximately 2 denier and round solid type.

Although staining on the spinneret surface was observed from about the third day of spinning, no significant bending of the spun yarn was observed even after the fifth day, and the spinning was extremely stable.

Further, the occurrence of yarn breakage during the drawing process was small, and the obtained mixed fiber yarn had little fuzz and was of good quality.

Comparative Example 1 Melt spinning was carried out in the same manner as in Example 1 except that aluminum acetate was not added. Precipitation of foreign matter was already observed on the spinneret surface after 10 hours of spinning, and frequent breakage of single yarns due to bending occurred after 24 hours.

Example 2 Magnesium stearate was prepared with an intrinsic viscosity of 1.22 in m-cresol at 35°C and an amino end group concentration of 50.
50 ppm as Mg per equivalent/ton of nylon 6
A dry chip blend and 35℃
Polyethylene terephthalate having an intrinsic viscosity of 0.64 in phenol was O-treated four times using a spinneret having the same spinning hole arrangement as in Example 1 (however, the number of holes in the outer peripheral row was also 24). Spinning temperature 280℃, take-up speed 1900m
/min and then drawn without winding to obtain a 75 denier/48 filament blended yarn. In addition, polyethylene terephthalate is discharged from the inner peripheral row spinning holes, while nylon 6 is discharged from the outer peripheral row spinning holes, each having a round solid cross-sectional shape and a single fiber fineness of about 1.5 denier after drawing. I made it so that In addition, the stretching conditions include a stretching temperature of 70
℃ stretching ratio was set to 2.1 times.

Although staining on the spinneret surface was observed from about the second day after the start of spinning, no bending was observed even after 6 days, and the spinning stability was good. Further, the obtained mixed fiber yarn was also of good quality and did not generate fuzz.

Comparative Example 2 Blend amount of magnesium stearate is 5 as Mg
Melt spinning was carried out in the same manner as in Example 2 except that ρpI was 11. Foreign matter was observed on the spinneret surface after 16 hours of spinning, and from about the second day, bending became noticeable and single yarn breakage occurred frequently.

Comparative Example 3 Blend amount of magnesium stearate is 1 as Mg
Melt spinning was carried out in the same manner as in Example 2 except that the concentration was 500 ppm. Although no foreign matter was observed around the nylon 6 spinning holes, the nylon 6 yarns were frequently broken just below the spinneret from the start of spinning, making spinning impossible. When heating was performed using a heater under the spinneret to improve spinning properties, bending of the polyethylene terephthalate yarn occurred, and spinning was still impossible.

In addition, the pack pressure increase on the nylon side was approximately 3 in Example 2.
This made it difficult to continue stable polymer discharge.

Example 3 Cobalt naphthenate was prepared with an intrinsic viscosity of 1.34 in m-cresol at 35°C and an amino end group concentration of 45 equivalents/
A dry chip blend of 50ppI11 of Co with 100% of nylon 6 and 35°C
Intrinsic viscosity in "C" O-chlorophenol is 0.72
of polyethylene terephthalate at a spinning temperature of 278°C.
A mixed fiber yarn of 75 denier/48 filaments was obtained in the same manner as in Example 2 except that the take-up speed was 1600 m/min.

From about 36 hours after spinning, there was a tendency for yarn to bend, but the yarn did not break even on the third day.

Comparative Example 4 Blending amount of cobalt naphthenate as CO 4 +1
Melt spinning was carried out in the same manner as in Example 3 except that the ratio was 11+1. From about the 10th hour of spinning, single yarn breakage occurred frequently due to bending, making it impossible to continue spinning.

Claims (1)

[Claims] (1) When producing a mixed yarn by melting and discharging polyester and polyamide from separate discharge holes distributed on the same spinneret surface, the polyamide is selected from magnesium compounds, aluminum compounds, and cobalt compounds. At least one type of compound as a metal component: 10~
A method for producing a mixed fiber yarn, characterized by using polyamide containing 1000 ppm (based on polyamide).