JPH0319918A - Conjugate fiber for producting extra fine fiber - Google Patents

Abstract

PURPOSE: To obtain the subject composite fiber of which ring state part extends along an outer circumferential edge part of fan-shaped parts and is connected with the end of the outer circumferential edge part side of a branched part, with an easily dissolvable polyester, and enabling the production of an artificial leather, excellent in elasticity and having a high dye fastness. CONSTITUTION: This composite fiber constituted by >=6 branched parts 8 extending radially toward an outer circumferential part P from the central part O of its cross section, with an easily dissolvable polyester as a first component P1 , also the fan-shaped part 10 formed between the above branched parts 8 adjacent each other with a fiber forming substance such as a polyamide such as a nylon 6 or a polyester as a second component P2 , is obtained by constituting the ring state part 9 extending along the outer circumferential edge part P of the above fan-shaped parts 10 and also connecting with the edge of the outer circumferential edge part P side with the above first component and forming so as to surround the fan-shaped part 10 consisting of the above second component with the above first component.

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention is characterized in that at least six branch portions extending from the center of the cross section toward the outer periphery are made of easily soluble polyester having an Irfc content. The present invention relates to a composite fiber for producing ultrafine fibers, in which the fan-shaped portions between the adjacent branch portions are made of boria or polyester, which is a fiber-forming substance, as a second component. .

[Summary of the invention]

In this invention, a plurality of branched portions extending from the center of the cross section toward the outer peripheral edge are made of easily soluble polyester, and a fan-shaped portion between the adjacent branched portions is made of a fiber-forming substance. In a composite fiber for producing ultrafine fibers made of polyamide or polyester, a ring-shaped part made of the above-mentioned easily soluble polyester is provided at the outer peripheral edge part, and the sector-shaped part is surrounded by the ring-shaped part and the branch part. , making knitting and weaving easier, making it possible to produce non-woven fabrics, and making it possible to completely remove easily soluble polyester afterwards, making it possible to produce artificial leather with excellent elasticity and high color fastness. This is what I did.

[Conventional technology]

For example, in the polyamide-polyester composite fiber described in Japanese Patent Publication No. 60-29771, the first component, easily soluble polyester, is discharged through a number of passages, and the second component is discharged through slits provided in the middle of these passages. $. It is produced by supplying polyamide in fibrous form or material. Further, the composite fiber thus obtained and having a cross-sectional shape as shown in FIG. 2 is knitted and woven as a material for producing artificial leather, high-density fiber, and the like.

[Problem to be solved by the invention]

However, in order to obtain ultrafine fibers from the above composite fibers,
If the separation process is carried out by mechanical means such as false twisting or raising, it is difficult to obtain a uniform degree of separation, which tends to cause staining spots. Note that the same results are obtained when chemical means using benzyl alcohol or the like is used instead of the above-mentioned mechanical means.

Furthermore, since the fan-shaped portion lO shown in FIG. 3B tends to separate easily, fuzz is likely to occur during knitting and weaving. There is also the problem that weaving efficiency decreases.

In addition, when the branch portion 8 (FIG. 3A) and the fan-shaped portion 10 (FIG. 3B) are mechanically separated and the branch portion 8, which is an easily soluble component, is dissolved, or when the separation is performed, When dissolving the branch part 8, if the dissolution is not complete,
There is also the problem that the difference in dyeability between polyamide and polyester makes it difficult to dye deep colors, resulting in a decrease in color fastness.

Furthermore, there is also the problem that it is impossible to produce nonwoven fabrics using the conventional conjugate fibers, since separation phenomena tend to occur in the conjugate fibers during the carding and crimping processes during the production of nonwoven fabrics.

In view of the above-mentioned points, the present invention provides a composite fiber for producing ultrafine fibers that can solve the above-mentioned problems.

[Means to solve the problem]

The present invention provides at least six branching portions extending from the center of the cross section toward the outer peripheral edge thereof, which are made of easily soluble polyester as a first component, and fan-shaped portions between the adjacent branching portions. In a composite fiber for producing ultra-fine fibers in which the second component is a fiber-forming material such as polyamide or polyester, the composite fiber extends along the outer periphery of the fan-shaped part and is located on the outer periphery side of the branch part. A conjugate fiber for producing ultrafine fibers was constructed in such a way that the ring-shaped part connected to the end was surrounded by the easily soluble polyester of the first component, and the fan-shaped part made of the second component was surrounded by the first component.

Note that the content ratio of the second component to the first component may be between 10:1 and 4:1.

Further, the content ratio of the annular portion and the branched portion of the first component may be between 4:6 and 6:4.

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 1 and 4.

Figure 1 shows a cross-sectional view of the composite fiber according to the present invention. In the figure, there are a total of eight branch parts 8 extending radially from the center O toward the outer peripheral edge p, and eight fan-shaped parts 10 formed between the adjacent branch parts 8. The annular portion 9 that extends along the peripheral edge p and is connected to the end of the branched portion 8 on the outer peripheral edge p side is made of easily soluble polyester, which is the first component P+. Incidentally, the above-mentioned eight fan-shaped portions 10 in total are made of polyamide or polyester, which is a fiber-forming substance, which is the second component P2.

A composite fiber having such a cross section can be produced using a spinning apparatus shown in FIG. In other words, in the same figure, the second component P
．． are forced through a plurality of passages 2 provided in the center of the device. The first component P, on the other hand, is forced through the channels l of the figure and flows in the slit 3 towards the center of the device.

The first component PI and the second component are
A certain amount of Pt is combined into a shape as shown in FIG.

Next, in the BB' cross section of FIG. 4, the first component PL further supplied through the passages 4 and 6 joins the flow flowing out from the passage 5, while crossing the flow shown in FIG. As shown in FIG. 1, the surface shape has a ring-shaped portion 9 at the outer peripheral edge p of the flow.

The stream having the cross-sectional shape described above is then extruded from the spinneret 7 and further drawn to obtain a composite fiber having the cross-section shown in FIG. The spinning speed is 700~12
0 m/s+in range, the stretching ratio is 3.0 to 4.0 m/s+in.
The range was set to 0x.

Next, this composite fiber is knitted or woven, or a nonwoven fabric is made from this composite fiber, and then a chemical treatment (for example, caustic soda treatment) is performed to completely remove the first component, the easily soluble polyester.

Incidentally, the content ratio of easily soluble polyester between the branched portion 8 and the ring-shaped portion 9 of the composite fiber can be adjusted by adjusting the relationship between the slit 3 and the passage 4 shown in FIG. be. When the ratio is 1:1, both workability and ease of chemical treatment are optimal.

That is, if the branch portion 8 is too large, workability will be reduced, and if the ring portion 9 is too large, not only will chemical treatment be difficult, but separation will also be difficult. In conclusion, l), the second component P. The content ratio of and the first component P+ is lO
Preferably, the content ratio between the annular part 9 and the branch part 8 is in the range from 4:6 to 6:4.

Two examples will be described below.

Sodium 5-sulfoisophthalate (5-Sodium sulfoisophthalate) at a concentration of 5.0 mol% compared to terephthalic acid (TPA)
ulfo-isophthallic acid) and 2.0 mol% adipic acid were added during the slurry production stage, and after a transesterification reaction at a temperature of 254°C for 3 hours and 30 minutes, a transesterification reaction was carried out at a temperature of 280-285°C and a pressure of 1 ssHg for 3 hours. Intrinsic viscosity (1. V.) 0.4 after reaction
A readily soluble polyester resin No. 7 was obtained, and this was used as the first component. Also, the relative viscosity is 2.5 in 95% sulfuric acid at a temperature of 25°C.
The second component is nylon 6.

For spinning, the spinning apparatus shown in FIG. 4 was used, and the spinning speed was 900 m/o+in. Then the temperature is 7
It was stretched with a heating roller at 5° C. until the stretching ratio was 4.0 times.

The resulting composite fiber was 75 d/36 fil and had the cross section shown in FIG. The content ratio of nylon 6 to easily soluble polyester was 4:1, and the content ratio of easily soluble polyester between the branched part and the ring part was 4:1 in the cross section shown in FIG.

A nonwoven fabric was made from the composite fiber thus obtained, and treated with 5% caustic soda at a temperature of 70° C. for 20 minutes to completely remove the 11th fc. That is, artificial leather was obtained by a normal artificial leather manufacturing method. The thickness of the fiber at this time was 0.20 denier.

According to the above experiment, separation of the fan-shaped portion 10 shown in FIG. 1 did not occur in the fibers before being treated with caustic soda during the non-woven fabric manufacturing process. Thus, operability was good.

Furthermore, the degree of separation of the fibers after the first component was removed was 98% or more. The artificial leather thus obtained was soft and highly elastic.

The content ratio of 1-star nylon 6 and easily soluble polyester is 9:1.
Also, after knitting a conjugate fiber with a content ratio of branched parts and ring parts of 6 to 4 into a tricone, artificial leather was produced in the same manner as in the first example. The thickness of the fiber at this time was 0.23 denier.

In the case of this experiment as well, separation of the fan-shaped portions did not occur during the manufacturing process of knitting or nonwoven fabrics, and the operability was good. Furthermore, the degree of separation of the fan-shaped portion after removing the first component was 98% or more, and the obtained artificial leather was soft and highly elastic.

〔Effect of the invention〕

Since the present invention has the above-described structure, it is not only easy to knit and weave, but also to easily make a non-woven fabric. Therefore, it is possible to produce artificial leather with a soft feel, but after removing the easily soluble polyester, the
By infiltrating about 5% of the space with polyurethane or PVC in the coating process, artificial leather with excellent elasticity can be easily obtained.

Further, according to the present invention, since it is possible to prevent two types of polymers from coexisting during dyeing, a decrease in color fastness can be avoided.

FIG. 3 is a vertical cross-sectional view of the main parts of the device.

In addition, in the symbols used in the drawings, 8...
-・・−・−・One branch part 9−・1・・・・・・−・・Annular part IO・−−−−−−・−・−・−Sector part P, ...
1----1..1 First component P2--.111 2nd part o----1.1.--1 Center p--.--.-- ．． This is the outer peripheral edge.

Claims (1)

[Claims] 1. At least six branch parts extending from the center of the cross section toward the outer peripheral edge are made of easily soluble polyester as the first component, and the branch parts are adjacent to each other. In a conjugate fiber for producing ultrafine fibers in which a fan-shaped part between is made of polyamide or polyester as a fiber-forming substance as a second component, the composite fiber extends along the outer periphery of the sector and extends along the outer periphery of the branch part. A conjugate fiber for producing ultrafine fibers, wherein a ring-shaped part connected to the side end is made of easily soluble polyester of the first component, and a fan-shaped part made of the second component is surrounded by the first component. 2. The composite fiber according to claim 1, wherein the content ratio of the second component to the first component is between 10:1 and 4:1. 3. The composite fiber according to claim 1, wherein the content ratio of the annular part and the branched part made of the first component is between 4:6 and 6:4.