JPH0874120A - Acrylic splitting fiber - Google Patents

Abstract

PURPOSE: To obtain an acrylic splitting fiber having an excellent splitting property and enabling to easily split the tip part of the raised fiber when used as the raised fiber for an artificial leather or pile fabric. CONSTITUTION: This acrylic splitting fiber comprises 60-97wt.% of an acrylonitrile polymer containing acrylonitrile in an amount of >=50wt.% and 3-40wt.% of a polymer inferior in the compatibility with the acrylonitrile polymer. The fiber has a cross-sectional shape which has depressions continued in the longitudinal direction of the fiber on the surface of the fiber.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an acrylic splittable fiber suitable for interior or clothing.

[0002]

2. Description of the Related Art In general, natural fur has a nap whose tip portion is thinner than the root portion of the hair, and therefore has a unique texture that the feel of the hair is soft in comparison with the thickness of the hair. There is. On the other hand, artificial fur using synthetic fibers has been provided in large numbers from the past, but since the napped fibers have a uniform thickness, if the same thickness as the napped hair of natural fur is used, the texture becomes rough and hard, It has not reached the range of natural fur.

As a method for improving such defects, synthetic fibers,
In particular, polyester fibers are used as napped fibers, and the tips of the napped fibers are immersed in an alkaline aqueous solution for hydrolysis, or the fibers are bundled and one end is immersed in a hydrolyzed aqueous solution for sharpening. 55-16906, JP-A-5
No. 6-134272) is proposed. Since all of these methods are processed by immersing them in a chemical solution, it is difficult to control the degree of thinning of the tips of the napped fibers, and the processing must be batch processing. , Production efficiency was poor, and there was an industrial problem.

On the other hand, the application of such a method to acrylic fibers is not practical and is not a chemical solution because the solvent that can be easily used industrially is few and the solvent recovery is difficult. A method has been proposed in which the shape has a Y-shaped cross section having splitting properties (Japanese Patent Application Laid-Open No. 1-51564), and the tip of the fiber is divided in a polisher step to be thinned to give flexibility and strong nap. Obtainable. However, in order to improve the splitting property and control the splitting property, a more accurate spinning nozzle and a high spinning technique for obtaining a specific fiber cross section are required.

[0005]

DISCLOSURE OF THE INVENTION The present invention has excellent splitting properties without using a chemical solution and without using a special fiber cross section, and when used for napped fibers of artificial fur or pile cloth. Another object of the present invention is to provide an acrylic dividable fiber whose napped tip can be easily thinned.

[0006]

The present invention comprises 60 to 97% by weight of an acrylonitrile polymer containing 50% by weight or more of acrylonitrile, and 3 to 40% by weight of a polymer having poor compatibility with the acrylonitrile polymer. The fiber is an acrylic dividable fiber having a fiber cross-sectional shape having a concave portion continuous on the fiber surface in the longitudinal direction of the fiber.

The acrylic splittable fiber of the present invention is composed of an acrylonitrile polymer containing 50% by weight or more of acrylonitrile, and a polymer having poor compatibility with the acrylonitrile polymer. In the present invention,
As the acrylonitrile-based polymer containing 50% by weight or more of acrylonitrile, any acrylonitrile-based polymer known as an acrylic fiber polymer is used.

Further, as a polymer having a poor compatibility with an acrylonitrile-based polymer (hereinafter referred to as a poorly compatible polymer), it is necessary that the acrylonitrile-based polymer is an incompatible or low compatible polymer. , Polymethylmethacrylate, polyethylmethacrylate, polyvinyl acetate, polyvinyl chloride and the like.

The composition ratio of the acrylonitrile-based polymer containing 50% by weight or more of acrylonitrile and the incompatible polymer is 60 to 97% by weight of the acrylonitrile-based polymer containing 50% by weight or more of acrylonitrile and 3 to 40% by weight of the incompatible polymer. %, And if the incompatible polymer is less than 3% by weight, the splitting property is inferior, and if it exceeds 40% by weight, fibrillation is apt to occur remarkably and handling becomes difficult. The fur up to the root is split to give a firm fur and cloth.

The acrylic splittable fiber of the present invention is
The fiber surface has a fiber cross-sectional shape having concave portions continuous in the longitudinal direction of the fiber. The concave portion continuous in the fiber surface in the longitudinal direction is formed by a convex portion, and the fiber cross-sectional shape is Y V-shaped, cross-shaped, gear-shaped, V-shaped, W
A fiber cross-sectional shape having at least one or more recesses continuous in the longitudinal direction of the fiber on the surface of the fiber, such as a letter-shaped or flattened unevenness, may be used. This depression in the fiber surface, in combination with the fiber constituents, provides a controlled splitting property which is indicative of the split position of the fiber.

The acrylic splittable fiber of the present invention is produced by the following method. That is, 60 to 97% by weight of an acrylonitrile-based polymer containing 50% by weight or more of acrylonitrile is added to and mixed with 3 to 40% by weight of a poorly compatible polymer, and the mixture is dissolved in a solvent, preferably spinning with a solid content concentration of 25% by weight. Prepare a stock solution. When preparing the spinning dope, each polymer may be dissolved in a common solvent and the solutions may be mixed to prepare a spinning dope having a solid content concentration as appropriate.

As the solvent, organic solvents such as dimethylformamide, dimethylacetamide, dimethylsulfoxide, etc., and inorganic solvents such as nitric acid, zinc chloride, rhodan salt, etc. can be used. It becomes clear and the splitting property becomes good. Further, it is desirable to use a common solvent for each polymer to be used.

The fiber shaping is performed by spinning a stock solution for spinning using a spinning nozzle having a hole shape capable of forming a fiber cross-sectional shape having concave portions continuous in the longitudinal direction of the fiber on the fiber surface.
The spinning is performed by discharging the spinning dope into a coagulation bath by a wet or dry-wet spinning method and winding it as a coagulated yarn at a spinning draft of 0.8 to 2.0 times, and the coagulated yarn is subsequently washed and drawn by a known method. Then, it is dried, subjected to heat relaxation treatment, and cut into a certain length to obtain raw cotton.

[0014]

EXAMPLES The present invention will be specifically described below with reference to examples. The splitting property was evaluated according to the following method.

Splitting property: 50 raw cotton fibers were tied at one end and cut with a razor leaving a length of 1 cm from the knot. Next, 5 of these fiber bundles were put into a domestic mixer together with 200 ml of water, stirred at a low speed for 15 seconds, and the split state was observed and measured by an optical microscope.

Example 1 Acrylonitrile 93% by weight
90% by weight of acrylonitrile-based polymer consisting of 7% by weight of vinyl acetate and 90% by weight of methyl methacrylate
And 10% by weight of a copolymer consisting of 10% by weight of methyl acrylate were dissolved in dimethylacetamide so that the solid concentration was 25% by weight to prepare a spinning dope. This spinning dope has a long side of 0.16 mm and a short side of 0.05 mm.
Was discharged from a Y-shaped spinning nozzle (the number of holes was 1000) in which three rectangles of (3) were combined into a coagulation bath of dimethylacetamide / water = 3/7 adjusted to 40 ° C., and spinning was performed at a spinning draft of 1.2 times.

This coagulated yarn is stretched 5 times, washed, applied with an oil agent, dried with a heat roller, subjected to crimping and heat relaxation treatment, and then cut into a certain length to obtain a single fiber fineness of 6 denier. Got Table 1 shows the evaluation results of the splitting property of the obtained raw cotton.

(Example 2) 93% by weight of acrylonitrile
95% by weight of acrylonitrile-based polymer consisting of 7% by weight of vinyl acetate and 90% by weight of methyl methacrylate
And 5% by weight of a copolymer consisting of 10% by weight of methyl acrylate were dissolved in dimethylacetamide so that the solid concentration was 25% by weight to prepare a spinning dope. A raw cotton having a monofilament fineness of 6 denier was obtained in the same manner as in Example 1 except that this spinning solution was used. Table 1 shows the evaluation results of the splitting property of the obtained raw cotton.

(Example 3) 93% by weight of acrylonitrile
And 90% by weight of an acrylonitrile polymer consisting of 7% by weight of vinyl acetate and 10% by weight of polyvinyl chloride,
A stock solution for spinning was prepared by dissolving in dimethylacetamide so that the solid content concentration was 25% by weight. A raw cotton having a monofilament fineness of 6 denier was obtained in the same manner as in Example 1 except that this spinning solution was used. Table 1 shows the evaluation results of the splitting property of the obtained raw cotton.
It was shown to.

Example 4 93% by weight of acrylonitrile
And 95% by weight of an acrylonitrile-based polymer consisting of 7% by weight of vinyl acetate and 5% by weight of polyvinyl chloride were dissolved in dimethylacetamide so that the solid concentration was 25% by weight to prepare a spinning dope. A raw cotton having a monofilament fineness of 6 denier was obtained in the same manner as in Example 1 except that this spinning solution was used. Table 1 shows the evaluation results of the splitting property of the obtained raw cotton.

Comparative Example A spinning dope was prepared by dissolving an acrylonitrile polymer consisting of 93% by weight of acrylonitrile and 7% by weight of vinyl acetate in dimethylacetamide so that the solid concentration was 25% by weight. A raw cotton having a monofilament fineness of 6 denier was obtained in the same manner as in Example 1 except that this spinning solution was used. Table 1 shows the evaluation results of the splitting property of the obtained raw cotton.

[0022]

[Table 1]

[0023]

INDUSTRIAL APPLICABILITY The acrylic splittable fiber of the present invention can be obtained without using a chemical solution and without forming a special fiber cross section, and is controlled by the component phase having different compatibility in the fiber and the concave portion of the fiber surface. When used as napped fibers for artificial fur or pile fabric, it has excellent splitting properties, and even though the napped tip can be easily thinned, napped hair with no split at the root It is a fiber that can be obtained and thus can be a flexible artificial fur or pile fabric that is strong and has excellent bulkiness. According to the present invention, a fiber material suitable for interior or clothing is provided. Is.

Claims (1)

[Claims] 1. 60 to 97% by weight of an acrylonitrile-based polymer containing 50% by weight or more of acrylonitrile,
A fiber composed of 3 to 40% by weight of a polymer having poor compatibility with the acrylonitrile-based polymer, and an acrylic dividable fiber having a fiber cross-sectional shape having concave portions continuous in the longitudinal direction of the fiber on the fiber surface.