JPH0411020A - Production of conjugate fiber - Google Patents

Abstract

PURPOSE:To obtain the subject conjugate fiber composed of a polyester component and a polyamide component joined with each other in a state to expose both components on the surface of the fiber, having excellent productivity and useful for woven or knit fabric by using a specific polyamide as the polyamide component. CONSTITUTION:The objective conjugate fiber is composed of a polyester component (e.g. polyethylene terephthalate) and a polyamide component (e.g. nylon 6) joined with each other at a weight ratio of preferably 20/80 to 80/20 in a state to expose both components on the surface of the fiber. The polyamide component used in the above fiber contains 10-1,000ppm (in terms of metal, based on the polyamide) of one or more kinds of compounds selected from magnesium compounds, aluminum compounds and cobalt compounds (e.g. acetate or chloride).

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for manufacturing composite #IIAM1. More specifically, the present invention relates to a method for producing with good productivity a composite fiber formed by bonding two components, polyester and polyamide.

(Prior technology) Conventionally, many methods have been proposed in which different types of polymers are bonded or blended within the same cross section in order to obtain functional fibers such as ultrafine yarns, latent crimped yarns, silk-like yarns, and special glossy yarns. has been done.

For example, in Japanese Patent Publication No. 63-53292,
A method for manufacturing 1111-type conjugate fiber, which consists of the cross section shown in the figure, has been proposed, and it is said that fine-grained yarn and yarn with a special cross-sectional shape can be obtained. Further, Japanese Patent Application Laid-Open No. 62-53409 proposes a composite irregular cross-section fiber having a cross section shown in FIG. 7, which has high color development, elegant luster, and good texture. As crimped composite fibers, Japanese Patent Publication No. 63-44843, Japanese Patent Application Laid-open No. 5
Publication No. 7-5911 and the like have also been proposed.

The polymers constituting these materials are mainly polyesters and polyamides from the viewpoints of physical properties, dyeing properties, aesthetics, and easy industrial availability.

The production of composite fibers consisting of two components, polyester and polyamide, has the disadvantage that the spinnability is much worse than when spinning polymer ester alone or when spinning polyamide alone. That is, within a short time after the start of melt spinning, blackish brown foreign matter is deposited around the spinning hole, which induces bending of the discharged yarn, and eventually the spinning itself becomes impossible.

For this reason, when bending due to foreign matter begins to occur, the spinneret needs to be replaced, which significantly impedes production.

In order to overcome this drawback, conventional methods have been used to improve mold release properties compared to polymer flow spinnerets. Various methods have been tried, such as examining the shape, but their effects cannot necessarily be said to be sufficient.

In terms of polymers, as proposed in Japanese Patent Application Laid-Open No. 1-139816, there is a method using a polyester that is polymerized using a germanium compound as a catalyst and generates less foreign matter.

However, the polyester proposed in JP-A-1-139816 has an expensive catalyst compound, and although it is effective in suppressing foreign matter around the spinning holes caused by polyester, the main component of the foreign matter generated around the spinning holes is It does not have the same effect on reducing thermal decomposition products of polyamide.

(Objective of the Invention) An object of the present invention is to provide a method for producing a composite fiber made by bonding polyester and polyamide, which reduces the generation of foreign matter around the spinning holes and improves productivity and operability.

(Means for Solving the Problem) As a result of intensive studies on foreign matter around the spinning hole during composite melt spinning of polyester and polyamide, the present inventors found that There is a close relationship between the two, and if the amount of foreign matter around the spinning hole is reduced, bending will not occur and stable spinning can be achieved for a long time.Furthermore, foreign matter around the spinning hole can be reduced by oozing out of thermal decomposition products when polyamide is melted. I discovered that. Furthermore, based on these findings, the present inventors continued intensive research and found that when a composite fiber with polyester is spun using polyamide containing specific amounts of magnesium compounds, aluminum compounds, and cobalt compounds, The present invention was achieved based on the discovery that the generation of foreign matter around the holes is extremely small and that spinning can be carried out stably for a long period of time without bending of the discharged yarn.

That is, the present invention provides a composite fiber in which a polyester component and a polyamide component are bonded together, and both components are exposed on the fiber surface. 10 to 100 as the metal content of one or more of
A method for producing a composite fiber characterized by using polyamide containing oppri.

The polyester used in the present invention contains terephthalic acid or its ester-forming derivative and 2H0(CH2).
Alkylene glycol having OH (however, p is 2 to 10
In particular, polyethylene terephthalate or polytetramethylene terephthalate produced from dimethyl terephthalate and ethylene glycol or tetramethylene glycol is preferred. If desired, up to about 15 mol % of other glycols or other esters or oxycarboxylic acids may be added to the reaction mixture during the preparation of the polyester.
For example, the acid component is one selected from dibasic acids or oxyacids such as 3,5-dicarboxybenzenesulfonic acid, adipic acid, sebacic acid, isophthalic acid, diphenylsulfonedicarboxylic acid, naphthalenedicarboxylic acid, and oxybenzoic acid. Or two or more types, as glycol components,
For example, it is one or more compounds selected from trimethylene glycol, propylene glycol, cyclohexane dimetatool, neopentyl glycol, and the like. Of course, the above copolyester may be mixed with other polyesters within 85 mol% of polymethylene terephthalate units.

Further, titanium oxide may be contained as a matting agent.

The polyamides used in the present invention include nylon 4, nylomene 6, nylon 6.6, nylomene 7, and nylon 6.1.
0, Nylomene 11, Nylon 12, a polyamide from bis(P-aminocyclohexyl)methane and 1,10-decamethylene dicarboxylic acid or 1,9-nonamethylene dicarboxylic acid, and less than 15 mol% of a third component in said polyamide. Examples include copolymers and copolymers or mixtures of two or more of these, with nylon 6 being particularly preferred.

In the present invention, it is necessary to contain 10 to 11,000 pp of one or more of a magnesium compound, an aluminum compound, and a cobalt compound as a metal content in these polyamides.

Although the details of the action of magnesium compounds, aluminum compounds, and balt compounds are unknown, they form ionic bonds and complexes with the amino end groups of polyamide, and suppress the deammonia reaction and virol ring formation reaction caused by the amino end groups. It is estimated that this reduces the amount of foreign matter around the spinning holes. One of magnesium, aluminum, and cobalt
If the concentration of one or more metal components is less than 10 ppi, the amount of amine terminal groups blocked will be insufficient, and the effect of reducing foreign substances around the spinning hole will be small.
I) If it is higher than I, the melt viscosity of the polyamide becomes too high, resulting in a lack of spinning stability and poor bondability with polyester, which is not preferable. In the present invention, 40 to 10
More preferably, the metal content is 0 ppl'l.

As the metal compound, fatty acid salts, chlorides, and iodides of magnesium, aluminum, and cobalt such as acetates and stearates can be used. One or more of these can be used, and the metal content is 10 to 100
The addition of these metal compounds, which should be 0 pprx, is
This may be carried out during polymerization, or triblending with polyamide chips may be carried out.

Incidentally, this polyamide may contain an anti-abrasive agent, an antistatic agent, a light resistance improving agent, a heat resistance improving agent, and the like.

Further, the total weight ratio of the polyester component and the polyamide component can be arbitrarily selected within the range of 20:80 to 80:20.

Examples of the cross-sectional shapes of the composite fibers obtained by the method of the present invention include those shown in FIGS. 1 to 8. The effects of the present invention are significant when the cross-sectional shape is as shown in this example. That is, it is a composite fiber in which a polyester component and a polyamide component are bonded together, and both components are exposed on the fiber surface. When the polyamide component is not exposed, there are fewer blackish brown foreign substances around the spinning holes.
It is preferable to use the polyamide of the present invention, but the effect is not remarkable.On the other hand, in cases where the polyester component is not exposed, it is preferable to use the polyamide of the present invention, but the The purpose can be achieved even if the means are used. However, if both the polyester and polyamide components are exposed, steam sealing around the spinning hole is not preferable because it will cause a decrease in the strength and elongation of the composite fiber due to hydrolysis of the polyester. In such hollow composite fibers, the hollowness ratio decreases, which has a negative effect on the splitting property and machinability in subsequent processing. This is particularly evident in

The present invention will be specifically explained below with reference to Examples, but the present invention is not limited thereto.

(Example 1) Aluminum acetate has an intrinsic viscosity of 1.32 in m-cresol at a temperature of 35°C and an amino end group concentration of 60 equivalents/
Tons of nylon 6, aluminum (A-3)
A dry chip blend of 5 ppi and polyethylene terephthalate with an intrinsic viscosity of 0.64 in 0-chlorophenol at a temperature of 35°C is shown at a spin block temperature of 270°C and a spinning speed of 810 m/min. A composite fiber having a yarn cross section was melt spun. The composite ratio (volume ratio) of both components of the composite fiber was polyethylene terephthalate/nylon 6=50150, the exposed area of nylon 6 was about 45%, and the drawn yarn configuration was 75 denier/25 filaments.

The spinneret surface began to become dirty from about the 3rd day after the start of spinning, but the bending did not become noticeable even on the 5th day, and stable spinning was possible.

(Comparative Example 1) Composite melt spinning was carried out in the same manner as in Example 1 except that #acid aluminum was not added.

Precipitation of foreign matter was already observed on the spinneret surface 12 hours after the start of spinning, and single yarn breakage due to bending occurred frequently within 24 hours.

(Example 2) Magnesium stearate was prepared with an intrinsic viscosity of 1.22 in m-cresol at a temperature of 35°C and an amino end group concentration of 5.
Magnesium (Mg
) and polyethylene terephthalate having an intrinsic viscosity of 0.64 in 0-chlorophenol at a temperature of 35°C were mixed at a spin block temperature of 280°C and a spinning speed of 1900 m/s.
A composite fiber having a yarn cross section shown in FIG. 8 was melt-spun in minutes. The composite ratio (volume ratio) of both components of the composite fiber is polyethylene terephthalate/nylon 6 = 50150, the exposed area of nylon 6 is approximately 45%, and the composition of the drawn yarn is 15%.
It was 0 denier/36 filament.

From about the second day of spinning, the spinneret surface began to become dirty, but even on the sixth day, there was no bending and stable spinning was possible.

(Comparative Example 2) A composite fiber was melt-spun in the same manner as in Example 2, except that the blend amount of magnesium stearate was 5 ppn. Foreign matter was observed on the spinneret surface 16 hours after the start of spinning.
From about the first day onwards, the bending became noticeable and single thread breakage occurred frequently.

(Comparative Example 3) Blend amount of magnesium stearate is 1500pp
The composite fiber was melt-spun in the same manner as in Example 2, except that the polyethylene terephthalate and nylon 6 were not joined at the outlet of the eight spindles, and a #IItli surface yarn as shown in FIG. 8 was formed. The fibers were discharged as they were without being separated, and yarn production was possible.

(Example 3) Cobalt naphthenate was added as cobalt (CO) to nylon 6 having an intrinsic viscosity of 1.32 in m-cresol at a temperature of 35°C and an amino end group concentration of 45 equivalents/ton.
A dry chip blend of 0 pOra and polyethylene terephthalate having an intrinsic viscosity of 0.72 in 0-chlorophenol at a temperature of 35°C were mixed into the first spin block at a spin block temperature of 278°C and a spinning speed of 1600 m/min.
A composite fiber having the yarn cross section shown in the figure was melt-spun. still,
The composite ratio of both components of the composite fiber (body 1) is polyethylene terephthalate/nylon 6 = 50150 and nylon 6
The exposed area was about 50%, and the drawn yarn composition was 75 denier/24 filaments.

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

(Comparative Example 4) A composite fiber was melt-spun in the same manner as in Example 3, except that the blend amount of cobalt naphthenate was 4 ppm.

From about the 10th hour of spinning, single yarn breakage occurred frequently due to bending, making it impossible to continue spinning.

(Effects of the Invention) According to the composite manufacturing method of the present invention, the productivity of the spinning process is not only improved, but also the occurrence of fuzz and yarn breakage in the weaving and knitting process can be reduced. A la fiber knitted fabric of good quality can be obtained using the composite fiber obtained by the method.

[Brief explanation of the drawing]

1 to 8 are cross-sectional views showing examples of cross sections of composite fibers obtained by the manufacturing method of the present invention, in which 1 represents polyester, 2 represents polyamide, and 3 represents a hollow portion. Patent Applicant Teijin Ltd. No. 1 2 5 Figure 6 Figure 7 Figure 3 4 Continued July y, 1990

Claims (1)

[Claims] (1) In the production of composite fibers in which a polyester component and a polyamide component are bonded together, and both components are placed exposed on the fiber surface, one of a magnesium compound, an aluminum compound, and a cobalt compound is added to the polyamide. A method for producing a composite fiber, characterized in that a polyamide containing 10 to 1000 ppm of metals is used.