JP2005194667A - Thick finesse acrylic fiber and pile fabric using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide thick fineness acrylic fiber that can give pile fabrics that closely resembles natural furs and has excellent appearance and soft and slippery feeling and provide pile fabric that has the very close feeling to the natural fur quilted coat. <P>SOLUTION: The fiber comprises an acrylonitrile polymer including more than 50 wt.% of acrylonitrile wherein the maximum width of the fiber side face is 100 to 220 μm, the cross-sectional area of the fiber is 800 to 3,500 μm<SP>2</SP>, the compression that is represented by the ratio of the minimum value A of the major axis to the maximum value B of the minor axis (A/B) is 6 to 20, and the content of the thick fineness acrylic fiber is 5 to 70 wt.% in the pile part on the basis of the total pile. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an excellent appearance characteristic useful as an artificial fur product typified by the pile product field, in particular, a bore / high pile field, a thick fine acrylic fiber capable of imparting a texture to the pile fabric, and a pile fabric using the fiber. .

  In general, napped animal fibers that make up natural fur are composed of relatively long stabbed hair (guard hair) with a narrow root and a narrow tip, and thin, relatively short vellus hair (down hair), and are soft to the touch. In addition, it gives a unique texture with a strong waist, and natural fur is a product with high consumer needs. Acrylic fibers have a texture and luster that are closest to animal hair fibers among synthetic fibers, and are therefore suitably used for pile products such as high pile bores that substitute for natural fur, so-called artificial fur products.

  However, in the case of artificial fur products using synthetic fibers, since the raw fibers have a uniform thickness unlike animal hair fibers, when using fibers with a thickness equivalent to the fibers corresponding to the stab of natural fur, The softness is inferior, and the texture of natural fur products is far from sufficient. Therefore, various improvements have been attempted so far in order to bring the appearance such as texture and luster closer to natural fur. For example, with regard to the texture, the fiber cross-sectional shape has been devised, and Y-shaped cross-section fibers (see Patent Document 1), rhombus cross-section fibers (see Patent Document 2), and flat cross-section fibers having protruding portions (Patent Document 3) And the like are disclosed for use in pile fabrics. However, in artificial fur products using these fibers, although the texture is improved, the presence of pile fibers used in the stabbed portion is particularly poor, and only those that do not resemble natural fur in terms of appearance can be obtained. I couldn't.

  On the other hand, for improving the appearance of artificial fur products, there is known a technique for obtaining acrylic fibers having animal hair luster by adding a metal compound and a cellulose derivative to a copolymer made of acrylonitrile (Patent Document 4). , See Patent Document 5). It is also known that animal hair-like gloss is manifested by having cracks perpendicular to the fiber axis direction by rapidly cooling and overdrawing the dried acrylic fiber containing a metal compound in the spinning process ( (See Patent Document 6). When a pile fabric is made using fibers produced by these techniques, the appearance of animal hair looks at first glance, but the presence of each fiber is insufficient, and as a result, other fibers around it. It has been difficult to distinguish between them, and the appearance of animal fur in natural fur has not been obtained, and until now there has not been a fiber that sufficiently exhibits both the appearance and texture of natural fur.

JP-A-61-275416 JP-A-6-346316 JP-A-8-260234 JP-A-56-44163 JP 56-44164 A Japanese Patent Laid-Open No. 3-146705

  The present invention focuses on the thickness and cross-sectional shape of acrylic fibers, and as a result of intensive studies on the relationship between the appearance and texture of the pile product, the width, fiber cross-sectional area and flatness of the acrylic are within a specific range. It is possible to provide a pile product that has an appearance characteristic in which the presence of each fiber is visually emphasized and has a soft texture close to animal hair fibers, and very close to natural fur products. And reached the present invention. The object of the present invention is to make the presence of each pile fiber visually in a pile product mainly made of bore and high pile, so that the natural fur product is superior in appearance characteristics, soft and slimy. It is an object to provide a pile fabric having a pile similar to stabs in natural fur using a thick fine acrylic fiber capable of obtaining a pile product close to.

The gist of the first invention of the present invention is a fiber made of an acrylonitrile-based polymer containing 50% by weight or more of acrylonitrile, wherein the maximum width of the fiber side surface is 100 to 220 μm, the fiber cross-sectional area is 800 to 3500 μm ² , and The fineness is characterized in that the flatness expressed by the ratio (A / B) between the minimum value A of the major axis and the maximum value B of the minor axis in the fiber cross section is 6-20. In the acrylic fiber, the gist of the second invention resides in a pile fabric characterized in that the above-mentioned thick fine acrylic fiber occupies 5 to 70% by weight of the entire pile. .

  According to the present invention, when used as a pile fiber of a pile portion in a pile product, the presence of each pile fiber in the pile portion has an appearance characteristic that is visually emphasized, and the pile portion is A thick fine acrylic fiber that can be used as a pile product very close to natural fur products having a soft texture similar to animal hair fibers can be provided, and a pile fabric using the thick fine acrylic fiber of the present invention as a pile fiber. When it is included in the pile portion, it is possible to provide a pile product having a soft texture and very close to a natural fur product.

Hereinafter, the present invention will be described in more detail.
The acrylonitrile polymer constituting the acrylic fiber of the present invention is an acrylonitrile homopolymer containing 50% by weight or more of acrylonitrile, or a copolymer of a monomer copolymerizable with acrylonitrile. When the content of acrylonitrile is less than 50%, the characteristics of acrylic fibers such as dyeing vividness and color developability are not exhibited, and other physical properties such as thermal characteristics tend to be lowered. Although the monomer used as a copolymerization component is not specifically limited, For example, acrylic acid, methacrylic acid and derivatives thereof, vinyl acetate, acrylamide, methacrylamide, vinyl chloride, vinylidene chloride and the like can be mentioned. If necessary, ionic unsaturated monomers such as vinylbenzene sulfonic acid soda, methallyl sulfonic acid soda, and acrylamidomethyl sulfonic acid soda can be used as a copolymerization component.

  The acrylic fiber of the present invention has a maximum fiber side width of 100 to 220 μm, preferably 120 to 190 μm. In the pile portion, the maximum width of the fiber side surface is the largest factor that gives the presence of each pile fiber. If the maximum width of the fiber side surface is less than 100 μm, the presence of pile fibers cannot be sufficiently obtained in the pile product. On the other hand, if it exceeds 220 μm, the texture of the pile becomes coarse and the texture of the pile product is impaired. .

The acrylic fiber of the present invention has a fiber cross-sectional area of 800 to 3500 μm ² , preferably 1200 to 3000 μm ² . This fiber cross-sectional area is also one of the factors that emphasize the presence of pile fibers, but if the fiber cross-sectional area is less than 800 μm ² , the appearance characteristics as pile fibers are still insufficient, and if it exceeds 3500 μm ² , The texture of the pile becomes rough and damages the texture of the pile product.

  Further, the acrylic fiber of the present invention has a flatness ratio of 6 to 20 expressed by a ratio (A / B) between the minimum value A of the major axis and the maximum value B of the minor axis length in the fiber cross section. , Preferably in the range of 10-18. The flatness of the fiber is a factor that mainly affects the texture as well as the appearance. When the flatness is less than 6, the pile cannot give a soft texture, and when it exceeds 20, the pile is soft, but the fibers are easily broken, and the pile product has a feeling of roughness. Detract from the texture.

  Further, the acrylic fiber of the present invention preferably contains 0.1 to 10% by weight, more preferably 0.3 to 5% by weight of titanium oxide based on the fiber. When titanium oxide is contained in the fiber, the presence of the pile fiber tends to be visually emphasized. The acrylic fiber of the present invention preferably has a fiber-fiber static friction coefficient of 0.2 to 0.7, more preferably 0.3 to 0.5. When the fiber-fiber static friction coefficient is less than 0.2, the fibers are slippery, the card passing property and the sliver conjugation property are poor, and are liable to be a defect in the spinning process. The friction is too large, and the soft and slimy pile texture of the present invention is impaired.

The acrylic fiber of the present invention can be produced, for example, by the following method.
An spinning solution is prepared by dissolving an acrylonitrile polymer containing 50% by weight or more of acrylonitrile in a solvent. As the solvent, organic solvents such as dimethylacetamide, dimethylformamide, dimethylsulfoxide, and inorganic solvents such as nitric acid and rhodan salt aqueous solution can be used. The polymer concentration in the stock solution for spinning is generally 15 to 35% by weight, and preferably 20 to 30% by weight in consideration of spinnability and process stability.

  The prepared spinning dope is discharged from a spinneret nozzle into a coagulation bath consisting of a solvent and water, and then the coagulated yarn is stretched 2-6 times in the bath to remove the solvent, apply an oil agent, and dry and densify. The Any spinneret may be used as long as it has a nozzle having a shape necessary for obtaining a target fiber. Examples of the nozzle shape include a rectangular shape, an elliptical shape, and a dumbbell shape. The spinning coagulation bath conditions can be arbitrarily selected according to the copolymerization component of the acrylonitrile-based polymer used, the solid content concentration of the spinning dope, the nozzle shape, and the fineness. The dried fiber is subjected to a heat relaxation treatment depending on the application, and balanced mechanical properties are imparted.

  In the pile fabric of the present invention, the acrylic fiber of the present invention is contained in the pile portion in an amount of 5 to 70% by weight, preferably 10 to 70% by weight of the entire pile. When the acrylic fiber is less than 5% by weight of the entire pile, other fibers are dominant in the structure of the pile fabric, so that it is difficult to obtain excellent appearance characteristics in which the presence of each pile fiber is emphasized. On the other hand, if it exceeds 70% by weight, conspicuous features are not exhibited, and it becomes uniform and tends to be far away from the intended natural fur-like pile fabric.

  The pile part in the pile fabric of this invention refers to the part which raises the fiber except the part of the base fabric of a pile fabric. The pile length refers to the length from the pile root to the pile tip of the raised portion. In general, a pile product has a pile portion composed of piles having a constant pile length, a pile portion in which long and short piles having different pile lengths are mixed, and a pile portion in which long and short piles having different pile lengths are manifested. There are various things to have.

  The pile fabric of the present invention may have a constant pile length or a mixture of long and short piles. When the pile fabric of the present invention is a pile fabric having a constant pile length, the acrylic fiber of the present invention is included as a constant pile length together with other fibers, but is a pile fabric in which long and short piles are mixed. In some cases, the acrylic fiber of the present invention is preferably present as a long pile.

  In particular, in a pile fabric having a two-stage pile portion of a long pile portion and a short pile portion, and a step pile fabric such as a pile fabric having a three-tier pile portion of a long pile portion, a middle pile portion and a short pile portion. It is more effective that the long pile portion is constituted by the acrylic fiber of the invention. The long pile portion of the step pile fabric is, for example, a guard hair portion, a so-called piercing portion in a three-step pile portion, a middle pile portion is a middle hair portion, and a short pile portion is a down hair portion, so-called hair production. Indicates the part. In addition, the level | step difference in the pile fabric of this invention means the difference in the pile length of a long pile part and a short pile part, for example in the case of a two-stage pile fabric. The short pile part in such a step pile fabric can be formed using, for example, heat-shrinkable fibers or fibers having different cut lengths.

  The pile fabric according to the present invention is excellent based on the acrylic fiber according to the present invention, particularly when the acrylic fiber occupies 5 to 70% by weight of the entire pile as the pile fiber constituting the long pile portion in the stepped pile fabric. Appearance and soft texture.

  When the pile fabric of the present invention is a step pile fabric, the average pile length difference between the long pile portion and the short pile portion, that is, the pile step is preferably 5 mm or more. If the pile length difference is less than 5 mm, the step structure is unclear and the effects of the present invention tend not to be fully exhibited. Furthermore, it is preferable that the average pile length of a long pile part is 30-80 mm, More preferably, it is 40-70 mm. If the pile length is less than 30 mm, even if there is a step between the long pile portion and the short pile portion, the step effect is not sufficiently emphasized, and a remarkable effect tends to be hardly exhibited. Too much emphasis is on the contrary and the appearance is impaired.

  The pile fabric of this invention can be manufactured, for example with the following method. The acrylic fiber of the present invention is used as a sliver, and a pile knitted fabric is knitted with this sliver by a sliver knitting machine, and then the knitted fabric is scraped with a pre-polishing treatment in which fibers are scraped from the knitted ground in an atmosphere of 120 ° C. After performing the pre-shearing process to cut and align the fibers, the pile length and the pile length are aligned, and then the back of the pile fabric is back-treated with an acrylic ester adhesive or the like in order to prevent the pile from coming off, and the dry heat is 90 to 170 ° C. It can be obtained by performing a polishing treatment and a shearing treatment in the above atmosphere and finally removing the crimps of the napped pile fibers. Also, when manufacturing a step pile fabric having long and short pile portions, heat shrinkable fibers are mixed in advance in a sliver, and the heat shrinkable fibers are shrunk during polishing treatment and shearing treatment in a dry heat atmosphere to form short pile portions. Form.

  Hereinafter, the present invention will be specifically described by way of examples. In addition, the evaluation item in an Example was measured with the following method.

Fiber side maximum width:
It measured from the picked-up image of the fiber side surface by a scanning electron microscope.
Fiber cross section:
It measured from the image | photographed image of the fiber cross section by a scanning electron microscope.
Flatness:
It measured from the image | photographed image of the fiber cross section by a scanning electron microscope.
Fiber-to-fiber static friction coefficient:
It measured by the friction coefficient measuring method of the chemical fiber staple test method based on JISL1015.

Appearance evaluation:
The appearance of the pile fabric was visually judged according to the following standard. In addition, the determination was performed by a four-step evaluation based on the following criteria from the visual viewpoint on the degree of appearance characteristics in which each of the pile fibers constituting the long pile portion of the pile portion is emphasized.
A: Appearance with a strong emphasis on the presence of each pile fiber ○: Appearance with an emphasis on the presence of each pile fiber Δ: Presence of each of the pile fibers Inferior feeling x: The presence of each pile fiber is very inferior.

Texture evaluation:
The pile fabric was judged by handling according to the following criteria. In the determination, “excellent” was determined when the softness was sufficiently felt, and “inferior” was determined when the texture was soft and hard.
◎: Very good ○: Excellent △: Slightly inferior ×: Inferior

[Examples 1-6, Comparative Examples 1-7]
A spinning stock solution was prepared by dissolving an acrylonitrile-based polymer consisting of 93% by weight of acrylonitrile and 7% by weight of vinyl acetate in dimethylacetamide (DMAc) to a solid content concentration of 25% by weight. Using this spinning stock solution, wet spinning was carried out under the conditions of a 400-hole nozzle and a coagulation bath (DMAc aqueous solution) shown in Table 1, and after 5 times stretching under wet heat while washing in boiling water, an oil agent was allowed to adhere. After drying with a dry heat roller at 150 ° C., mechanical crimping is applied by a gear crimping method or a stuffing box method, and then relaxation treatment is performed under pressurized steam to obtain an acrylic fiber having a fiber form and a friction coefficient shown in Table 1. It was.

[Example 7]
In Example 1, thick fine acrylic fibers shown in Table 1 were obtained in the same manner as in Example 1 except that 1.3 parts by weight of titanium oxide was added during the preparation of the spinning dope.

  The thick fiber acrylic fiber obtained in Examples 1-7 and the acrylic fiber obtained in Comparative Examples 1-7 were each cut to 51 mm, each 40% by weight of raw cotton, 38 mm fiber length, single fiber fineness A 3.3 dtex commercial acrylic fiber (Mitsubishi Rayon Co., Ltd., Bonnell V17) 30% by weight was blended into a sliver, and the knitted fabric was knitted with a sliver knitting machine. Next, this knitted fabric is subjected to a pre-polishing treatment and a pre-shearing treatment at 120 ° C., and after forming a pile and arranging the pile length, a backing treatment is applied to the back side of the pile fabric with an acrylic ester adhesive, and a dry heat of 90 to Polishing treatment and shearing treatment were performed in an atmosphere at 170 ° C., and the piles of the pile fibers piled up at the end were removed to obtain a pile fabric.

The obtained pile fabric had a pile basis weight of 1000 g / m ² and an average pile length of 25 mm. Table 2 shows the appearance and texture evaluation results of the obtained pile fabric. The pile fabrics obtained using Examples 1 to 7 have characteristic appearance characteristics in which the presence of each of the fibers of the present invention is visually emphasized in the pile portion as shown in Table 2. It had a soft texture.

[Examples 8 to 9, Comparative Example 8]
Raw cotton obtained by cutting the thick fine acrylic fiber obtained in Example 1 into 76 mm, a fiber length of 76 mm, a single fiber fineness of 3.3 dtex, a commercially available acrylic fiber (Mitsubishi Rayon, Bonnell V17), a fiber length of 76 mm, and a single fineness A commercially available heat-shrinkable acrylic fiber (manufactured by Mitsubishi Rayon Co., Ltd., Bonnell V37) was blended at a ratio shown in Table 3 into a sliver, and a pile fabric was obtained in the same manner as in Example 1. . The obtained pile fabric was a step pile fabric having a pile basis weight of 800 g / m ² , an average pile length at the long pile portion of 30 mm, and a pile step of 7 mm. Table 3 shows the appearance and texture evaluation results of the resulting step pile fabric. The step pile fabrics of Examples 8 and 9 had a characteristic appearance characteristic in which the presence of each of the fibers of the present invention was visually emphasized in the long pile portion, and the pile texture was soft. The step pile fabric of Comparative Example 8 was inferior in both appearance characteristics and texture. In Tables 3 and 4, Examples 1, V17, and V37 used fibers are the acrylic fibers obtained in Example 1, Bonnell V17 manufactured by Mitsubishi Rayon Co., and Bonnell V37 manufactured by Mitsubishi Rayon Co., respectively. means.

[Examples 10 to 11, Comparative Example 9]
The raw cotton obtained by cutting the thick fine acrylic fiber obtained in Example 1 into 102 mm and a commercially available heat-shrinkable acrylic fiber (manufactured by Mitsubishi Rayon Co., Bonnell V37) having a fiber length of 76 mm and a single fine fiber of 3.3 dtex In the same manner as in Example 1, a pile fabric was obtained. The obtained pile fabric was a step pile fabric having a pile basis weight of 900 g / m ² , an average pile length at the long pile portion of 55 mm, and a pile step of 25 mm. Table 4 shows the appearance and texture evaluation results of the resulting step pile fabric. The step pile fabrics of Examples 10 and 11 had characteristic appearance characteristics in which the presence of each of the fibers of the present invention was visually emphasized in the long pile portion, and the pile texture was soft. The step pile fabric of Comparative Example 9 was inferior in both appearance characteristics and texture.

By having the specific fiber shape, the thick fine acrylic fiber of the present invention emphasizes the presence of the fiber and has a soft texture, so that an animal hair-like pile product closer to natural fur is obtained. It is extremely useful as a material that can be used. In addition, the pile fabric using the high-thickness acrylic fiber of the present invention as a pile fiber due to the characteristics of the high-thickness acrylic fiber of the present invention has a presence of each single high-fineness acrylic fiber of the present invention at the pile portion. It is visually emphasized and has a soft texture, enabling the development of new pile products for clothing, toys, interiors, etc.

Claims (6)

A fiber made of an acrylonitrile-based polymer containing acrylonitrile at 50% by weight or more, wherein the maximum width of the fiber side surface is 100 to 220 μm, the fiber cross-sectional area is 800 to 3500 μm ² , and the minimum length of the long axis in the fiber cross section A flatness acrylic fiber having a flatness ratio of 6 to 20 represented by a ratio (A / B) between a value A and a maximum value B of minor axis lengths.   The thick fiber acrylic fiber according to claim 1, wherein the fiber contains 0.1 to 10% by weight of titanium oxide.   The thick fiber acrylic fiber according to claim 1 or 2, wherein a fiber-fiber static friction coefficient is in a range of 0.2 to 0.7.   A pile fabric characterized in that the thick fine acrylic fiber according to any one of claims 1 to 3 is contained in a pile portion in an amount of 5 to 70% by weight of the entire pile.   The pile fabric is a step pile fabric having a long pile portion and a short pile portion, and the thick fine acrylic fiber according to any one of claims 1 to 3 is included in the long pile portion. 4. The pile fabric according to 4. The pile fabric according to claim 5, wherein in the step pile fabric, the pile length difference between the long pile portion and the short pile portion is 5 mm or more, and the pile length of the long pile portion is 30 to 80 mm.