JP2019007122A - Flat acrylonitrile-based fiber having 3d crimp and pile fabric using the fiber - Google Patents

Abstract

To provide a flat acrylonitrile-based fiber having excellent under-supporting effect of guard-hairs after having been through a dyeing process, and capable of suppressing falling-off of pile fibers, and a pile fabric using the fiber, in order to solve the problem in which conventionally, a method of manufacturing excellent napped pile by under-supporting guard-hairs by using shrinkable fibers as down-hairs is used; however, there were problems that under-supporting of the guard-hairs by the down-hairs may be insufficient, and that the amount of falling-off of pile fibers increases if great importance is placed on the texture.SOLUTION: The flat acrylonitrile-based fiber is an acrylonitrile-based fiber which contains two kinds of acrylonitrile-based polymer components having different acrylonitrile content rates and having flat cross sections, wherein the two acrylonitrile-based polymer components form side-by-side or random structure.SELECTED DRAWING: None

Description

  This technology makes full use of the down hair crimp to support guard hair, and when it is made into a pile fabric, it has excellent appearance such as napping properties, can reproduce softness more realistically, and yield of fibers during pile processing The present invention relates to a flat acrylonitrile-based fiber capable of improving the strength and a pile fabric using the fiber.

  Conventionally, acrylonitrile-based synthetic fibers have been used in the fields of clothing and piles because of their excellent color development and texture. In particular, an acrylic pile consisting of two layers of down hair and guard hair can reproduce the appearance of animal hair such as mink and fox more realistically. However, it is said that there is a problem in terms of napping properties. For example, Patent Document 1 uses a method in which non-shrinkable fibers and shrinkable fibers are mixed to cause shrinkage of the shrinkable fibers during finishing. Thereby, a clearer level | step difference expresses in down hair and guard hair, guard hair is supported by the down hair which shrunk, and it can be set as the pile which has the hair raising property close | similar to animal hair.

JP 2010-18910 A

  However, in general, a pile is produced using dyed fibers. For example, if high-temperature dyeing is performed for deep dyeing, shrinkage fibers shrink during the dyeing process. There was a problem that was not expressed very much. As a result, there is no clear level difference between the down hair and the guard hair of the produced pile fabric, the supporting effect by the down hair is insufficient, and the appearance such as napping is inferior compared to animal hair.

In addition, when it comes to placing importance on the soft texture, the pile fabric for clothing needs to be thinly glued at the time of pile processing, but as a price, the fibers fall out during the pile processing, and before and after the processing, the pile fabric There is a problem that the fabric weight of the pile fabric decreases or the pile fabric loses hair during use.

  The present invention has been made on the basis of such a present situation, and the purpose thereof is that it is difficult to remove hair when it is made into a pile fabric, and an appearance such as excellent napping property regardless of the presence or absence of high-temperature treatment such as high-temperature dyeing. Another object of the present invention is to provide a flat acrylonitrile fiber capable of expressing softness and a pile fabric containing the fiber.

  As a result of intensive studies on the above problems, the present inventors have used a flat acrylonitrile-based fiber having a flat fiber cross section and an excellent three-dimensional crimp as a down hair constituting a pile fabric. It has been found that, even after passing through the process, the excellent support effect of the guard hair by the down hair can be obtained, the hair removal of the produced pile fabric is suppressed, and the above object can be achieved. That is, the object of the present invention is achieved by the following means.

[1] Acrylonitrile-based fibers having two acrylonitrile-based polymer components having different acrylonitrile content ratios and having a flat cross section, and the two acrylonitrile-based polymer components form a side-by-side or random structure. A flat acrylonitrile fiber characterized by that.
[2] The [1] characterized in that the Cf value calculated by the following formula 2 based on the crimp number Cn and the crimp rate Ci obtained according to JISL1015: 2010 after no-load boiling water treatment is 16 or more. The flat acrylonitrile fiber described.
(Formula 2)
Cf = Cn × (1-Ci / 100)
[3] A pile fabric characterized in that at least 20% by weight or more of the fibers constituting the down hair is the flat acrylonitrile fiber according to [1] or [2].
[4] The pile fabric according to [3], wherein at least 10% by weight or more of the fibers constituting the down hair are acrylonitrile fibers having a Cf value calculated by the above formula 2 of less than 16.

  According to the present invention, the down hair is flattened and the crimps are sufficiently expressed, so that the down hairs are sufficiently entangled with each other, so that the pile fabric can be prevented from falling out and an excellent guard hair support effect can be obtained. Therefore, it is possible to provide a pile fabric excellent in appearance such as napping properties and softness.

  The flat acrylonitrile fiber of the present invention contains two acrylonitrile polymer components having different acrylonitrile content ratios. By adopting such a two-component structure, a coil-like three-dimensional crimp can be expressed in the fiber itself due to the difference in thermal shrinkage rate of the acrylonitrile-based polymer. As a result, even after passing through the production process of a pile fabric in which the shrinkage is extended, the guard hair is supported by the crimps that the fiber has, so that the pile fabric obtained using the fiber has napping properties, etc. The appearance is excellent.

Examples of the two-component structure described above include a side-by-side structure that is a two-layer structure in which two acrylonitrile-based polymer components are bonded together, or a random structure in which the number of layers differs depending on each single fiber. By adopting such a two-component structure, it becomes possible to cause the fiber to exhibit three-dimensional crimps due to the difference in thermal shrinkage rate between the constituent components. Of the two types of structures described above, the side-by-side structure is preferable from the viewpoint that three-dimensional crimps are more easily expressed.

  The flat acrylonitrile fiber of the present invention has a flat cross-sectional shape. By adopting such a shape, the cross-sectional second moment of the fiber is lowered, so that crimps due to the difference in the thermal shrinkage of the polymer components constituting the fiber are easily developed. As a result, the entanglement between the fibers becomes stronger, and when a pile fabric is obtained, an effect of suppressing hair loss is obtained, and a pile excellent in appearance and softness such as napping properties can be obtained.

  The flat acrylonitrile fiber of the present invention has a Cf value of preferably 16 or more, more preferably 18 or more, and still more preferably 20 or more. The Cf value here represents the number of crimps per inch of the fiber when the fiber is stretched at a specific ratio. If this Cf value is high, even after the fiber is stretched It can be said that sufficient crimp remains in the fiber. If this Cf value is 16 or more, crimping can be maintained even after passing the pile processing step, and an excellent appearance can be expected when a pile fabric is produced, and an improvement in quality can be expected. On the other hand, when the number is less than 16, crimps are stretched during the pile processing step, and the desired appearance such as napping may not be obtained.

  The acrylonitrile polymer constituting the flat acrylonitrile fiber of the present invention may be a copolymer of acrylonitrile and another vinyl monomer, and the acrylonitrile content ratio as a monomer composition is preferably 40% by weight. As described above, it is desirable that the content is 70% by weight or more, and more preferably 80% by weight or more. If the acrylonitrile content is less than 40% by weight, sufficient fiber strength may not be obtained when it is made into a fiber. Of the two acrylonitrile-based polymer components, the acrylonitrile content ratio of the high shrinkage component is preferably less than 90% by weight because it is easy to obtain an excellent three-dimensional crimp.

  The two acrylonitrile-based polymer components having different acrylonitrile content ratios employed in the present invention are preferably those having an acrylonitrile content ratio different by 1.0% by weight or more, more preferably 1.5% by weight or more. . Thereby, the three-dimensional crimp resulting from the difference in the heat shrinkage rate due to the difference in the acrylonitrile content ratio is sufficiently exhibited, and when it is made into a pile fabric, it can have an appearance such as excellent napping property. On the other hand, if the difference in the acrylonitrile content is less than 1.0% by weight, the difference in heat shrinkage between the two acrylonitrile polymers becomes small, and the desired crimp cannot be obtained. There is a risk that the quality of

  Further, other vinyl monomers that can be copolymerized with acrylonitrile are not particularly limited, but acrylic acid, methacrylic acid, or esters thereof; acrylamide, methacrylamide, or N-alkyl substituted products thereof; acetic acid Vinyl esters such as vinyl; vinyl halides or vinylidenes such as vinyl chloride, vinyl bromide, vinylidene chloride; unsaturated sulfonic acids such as vinyl sulfonic acid, allyl sulfonic acid, methallyl sulfonic acid, p-styrene sulfonic acid, or These salts can be mentioned. In addition, as long as the said acrylonitrile-type polymer satisfy | fills the above-mentioned composition, you may use multiple types as a structural component.

In the flat acrylonitrile fiber of the present invention, the lower limit of the flatness calculated by dividing the major axis length of the cross section by the minor axis length is preferably 1.5 or more, more preferably 1.7 or more. preferable. Moreover, as an upper limit, it is preferable that it is 10 or less, It is more preferable that it is 7 or less, It is further more preferable that it is less than 4. By setting it within this range, it is possible to obtain a pile fabric excellent in appearance such as napping and softness.

  The fineness of the flat acrylonitrile fiber of the present invention is preferably 0.5 to 20 dtex, more preferably 1.0 to 15 dtex, and further preferably 1.0 to 8 dtex. When the fineness is less than 0.5 dtex, since the fibers are too thin, the feeling of convergence becomes strong and the appearance may be deteriorated. Moreover, when it exceeds 20 dtex, since a fiber is too thick, there exists a possibility that the external appearance and soft property as a pile fabric may deteriorate.

  As described above, the method for synthesizing the acrylonitrile polymer constituting the flat acrylonitrile fiber of the present invention is not particularly limited, and is a well-known polymerization means such as suspension polymerization method, emulsion polymerization method, solution polymerization method. Etc. can be used.

Further, the method for producing the flat acrylonitrile fiber of the present invention using the obtained polymer is not particularly limited, but generally an example in the case of producing using a wet spinning method is generally well known. Two acrylonitrile polymers having different acrylonitrile content ratios produced by known aqueous suspension polymerization are respectively dissolved in a solvent to prepare a stock solution (high acrylonitrile-containing polymer stock solution (A), low acrylonitrile-containing polymer stock solution) (B).

Here, examples of the solvent for dissolving the acrylonitrile-based polymer include organic solvents such as dimethylformamide, dimethylacetamide, dimethyl sulfoxide, and acetone, and inorganic solvents such as nitric acid, zinc chloride aqueous solution, and sodium thiocyanate aqueous solution. .

The prepared stock solutions of A and B were prepared by using, for example, a composite spinning apparatus as disclosed in Japanese Examined Patent Publication No. 39-24301, and A and B in a weight ratio of A / B = 20/80 to 80/20. In a proportion, the fiber is guided to the composite spinneret, extruded into a coagulation bath, and then subjected to washing with water, stretching, densification drying, wet heat treatment, oil agent treatment, crimping treatment, and the like to produce a side-by-side type fiber. In addition, it is possible to make a random type by spinning a spinning solution that is layered randomly with a mixer, etc., or by changing the nozzle hole type to be used or changing the spinning speed. Thus, it becomes possible to obtain a fiber having a desired flat shape. At that time, an arbitrary Cf value can be obtained by changing the weight ratio of A and B and the wet heat treatment temperature.

  As a method for producing a pile fabric using the flat acrylonitrile fiber of the present invention, it can be produced using a conventionally known production method. Further, the form of the fiber at that time is not particularly limited, and any of sliver, spun yarn, filament and the like may be used.

The pile fabric of the present invention contains the flat acrylonitrile fiber of the present invention as down hair. As the content, the flat acrylonitrile fiber of the present invention is contained at least 20% by weight or more, preferably 30% by weight or more as the fiber constituting the napped portion. If the ratio of the flat acrylonitrile fiber of the present invention is less than 20% by weight, the effect of crimping cannot be sufficiently obtained, and the quality of the pile fabric is deteriorated, for example, the appearance is deteriorated.

Furthermore, the pile fabric of the present invention preferably uses the acrylonitrile fiber having a Cf value of less than 16 as the guard hair, more preferably 10 or less, and even more preferably 8 or less. Thereby, in a pile processing process, the crimp of the acrylonitrile-type fiber whose Cf value is less than 16 is fully extended, and the outstanding external appearance like animal hair can be expressed.

The amount of the acrylonitrile fiber having a Cf value of less than 16 is at least 10% by weight, preferably 15% by weight, of the fiber constituting the napped portion. When the acrylonitrile fiber having a Cf value of less than 16 is less than 10% by weight, an excellent appearance like animal hair may not be obtained.

The cross-sectional shape of the acrylonitrile fiber having a Cf value of less than 16 is not particularly limited, and a round shape, a flat shape, a triangular shape, a Y shape, a cross shape, and the like can be adopted. Among them, the flat shape is desirable in that when a pile is produced, an appearance with a small convergence feeling is obtained and a product with good softness is easily obtained.

The fineness of the acrylonitrile fiber having a Cf value of less than 16 employed in the present invention is preferably 10 to 40 dtex, and more preferably 17 to 30 dtex. If the fineness is less than 10 dtex, the appearance like animal hair may be impaired. Moreover, when it exceeds 40 dtex, there exists a possibility that the soft property as a pile may fall.

In addition to the flat acrylonitrile fiber of the present invention and the acrylonitrile fiber having a Cf value of less than 16, the pile fabric described above may be mixed with other fibers.

The other fibers described above are not particularly limited, and rayon, nylon, polyester, cotton, acrylic, and the like can be used. These are not limited to one type, and a plurality of types can be used.

The cross-sectional shape of the fiber is not particularly limited, and may be round or non-round. Examples of the non-round include flat, triangular, elliptical, Y-shaped, and cross-shaped cross sections.

  EXAMPLES Hereinafter, although an Example demonstrates this invention concretely, this invention is not limited to a following example. Moreover, unless otherwise specified, the part and percentage in an Example are shown on a mass basis. Note that the appearance and softness of the pile fabric described in the examples were measured by the following methods.

(1) Crimp number Cn
Measured and calculated according to JIS L1015.

(2) Crimp rate Ci
Measured and calculated according to JIS L1015.

(3) Cf value Based on Cn and Ci measured and calculated according to JIS L1015, the Cf value is calculated according to the following formula 3.
(Formula 3)
Cf = Cn × (1-Ci / 100)

(4) Take out 150 to 200 single fibers from the flatness sample fiber, and arrange them into a fiber bundle. The cross section of the fiber bundle was cut, and a cross-sectional photograph was taken using an optical microscope. The short diameter (A) and long diameter (B) of 50 fibers were measured from the cross-sectional photograph, and calculated by the aspect ratio (A) / (B).

(5) Appearance Evaluation of Pile Fabric The produced pile fabric was evaluated according to the following four criteria based on the visual feeling of how it was against natural fox fur.
◎ Almost the same as the appearance of natural Fox.
○ Close to natural fox appearance △ Slightly inferior to natural fox appearance × Slightly inferior to natural fox appearance

(6) Evaluation of softness of pile fabric The prepared pile fabric was evaluated according to the following three criteria based on the tactile sensation of how it was against natural fox fur.
◎ It is almost the same as the soft feeling of natural fox ○ It is close to the soft feeling of natural fox × Inferior to the soft feeling of natural fox

(7) Peeling test of pile fabric The test method is the same with reference to the feather adhesion test method (QTEC95-1111) of the Japan Textile Products Quality Technology Center (QTEC) test method. Evaluation was performed by actually counting the number of fibers adhering to the tape and comparing the number. When measuring the number of fibers, the adhesive component of the cellophane tape is removed by applying, for example, a lubricant (TB1801B) manufactured by ThreeBond Co., Ltd. to the cellophane tape, so that it can be easily measured. .

(Examples 1-4, Comparative Examples 1-2, Production Examples 1-2) Production of Acrylonitrile Fibers Acrylonitrile polymers are prepared by suspension polymerization of 88 parts by weight of acrylonitrile and 12 parts by weight of vinyl acetate as high heat shrink components. A was produced. Further, acrylonitrile polymer B was prepared by suspension polymerization of 90 parts by weight of acrylonitrile and 10 parts by weight of methyl acrylate as a low heat shrinkage component.

Ten parts of each of the acrylonitrile polymers A and B were dissolved in 90 parts of a 50% aqueous sodium rhodate solution to prepare spinning stock solutions Ap and Bp. The spinning dope is introduced into a composite spinneret using, for example, a composite spinning apparatus disclosed in Japanese Patent Publication No. 39-24301, and Ap and Bp are mixed in a component ratio shown in Table 1, and in a 10% rhodasoda aqueous solution as a coagulation bath. Then, after stretching 10 times with boiling water, it was dried with hot air at 115 ° C., and further heat-treated in pressurized steam at 120 ° C. to obtain acrylonitrile fiber. Needless to say, a single component fiber can be produced using a conventionally known method for producing acrylonitrile. Acrylonitrile-based fibers a to h with adjusted fineness and cross-sectional shape were produced by using the mixer, the type of the spinneret used in this case, and the difference in pore diameter. Detailed data of each fiber is shown in Table 1.

(Examples 5-9, Comparative Examples 3-5)
Acrylonitrile fibers a to h were mixed at a ratio shown in Table 2 and used as a sliver with a fiber opening / carding machine. The sliver was knitted with a pile knitting machine to a basis weight of 1100 g / m ² , and then a paste was applied to the back surface and dried to prepare a pile raw fabric.
The pile fabric was subjected to a steam treatment for 20 minutes to develop sufficient crimps on the fibers, and then repeatedly subjected to a polishing treatment at a temperature of 90 to 190 ° C. to produce a pile fabric.
Table 2 shows the results of evaluation of the acrylonitrile fiber mixing ratio, the appearance of each pile fabric, and the softness of the pile fabrics produced as examples and comparative examples.

Since the pile fabric of Examples 5-9 contains the flat acrylonitrile-type fiber of this invention in the napped part, it had a favorable external appearance and softness because guard hair was supported. On the other hand, Comparative Example 3 uses acrylonitrile fiber having a round cross-sectional shape, resulting in a decrease in appearance and softness. Moreover, in the comparative example 4, since the acrylonitrile fiber which consists only of 1 component of Ap was used, the support effect of the guard hair by crimping was not acquired, and external appearances, such as a nap property, deteriorated. Furthermore, in Comparative Example 5, since the content ratio of the flat acrylonitrile fiber of the present invention was as small as 15%, the support effect of guard hair was not sufficiently obtained, and the appearance was deteriorated.

Moreover, when the hair-peeling test was performed using the pile fabric of Example 7 using the flat acrylonitrile fiber of the present invention and the pile fabric of Comparative Example 3, Comparative Example 3 using a conventional shrink fiber as down hair. Is an average of 100 fibers, while the average of Example 7 using the flat acrylonitrile fiber of the present invention is 68 fibers, and a good result was obtained when the number of hair loss was reduced by about 30%. . Therefore, it is considered that the use of the flat acrylonitrile fiber of the present invention as down hair can suppress hair loss in the pile processing step, and it can be expected that the decrease in the basis weight is reduced before and after the pile processing.

Claims (4)

It is an acrylonitrile fiber containing two acrylonitrile polymer components having different acrylonitrile content ratios and having a flat cross section, wherein the two acrylonitrile polymer components form a side-by-side or random structure. A flat acrylonitrile fiber. The flatness according to claim 1, wherein the Cf value calculated by the following formula 1 based on the number of crimps Cn and the crimp rate Ci obtained according to JISL1015: 2010 after no-load boiling water treatment is 16 or more. Acrylonitrile fiber.
(Formula 1)
Cf = Cn × (1-Ci / 100)   A pile fabric characterized in that at least 20% by weight or more of the fibers constituting the down hair is the flat acrylonitrile fiber according to claim 1 or 2. The pile fabric according to claim 3, wherein at least 10% by weight or more of the fibers constituting the down hair are acrylonitrile-based fibers having a Cf value calculated by the above formula 1 of less than 16.