JP2017066553A - Flat acrylic fiber and plush product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flat acrylic fiber and a plush product having flexible feeling without deteriorating bulkiness and pile handleability.SOLUTION: The flat acrylic fiber has average single fiber fineness of 2.2 to 4.4 dtex, tensile strength of 2.0 cN/dtex or more, fiber cross section surface with a flat shape, ellipticity A/B, where A is length of a long side and B is length of short side, of 4.0 to 10.0 and crimp number of 5 to 15 mountain/inch.SELECTED DRAWING: None

Description

  The present invention relates to flat acrylic fibers and napped products having a soft texture without impairing bulkiness and bristleiness.

  Acrylic fibers have a soft texture, heat retention, bulkiness and excellent dyeability that are most similar to wool compared to other synthetic fibers, and are widely used in the clothing and interior fields. In particular, acrylic fibers having a flat cross-section have an animal hair-like texture, and are therefore suitably used for napped products such as bores and high piles. However, in recent years, there has been an increasing demand for napped products having a softer texture, and improvement of acrylic fibers has been demanded.

  Conventionally, various proposals have been made for improving acrylic fibers used in napping products. For example, an acrylic fiber having a protrusion having a predetermined size on the long side of a flat cross section has been proposed (see Patent Document 1). However, the acrylic fiber having such a cross-sectional shape has a problem that flexibility is impaired although it has excellent bristleiness and bulkiness due to the protrusions.

  The fiber cross-sectional shape of the acrylic fiber is a leaf type, a bamboo leaf type or a fan shape, the flatness is 2 or more and 10 or less, and has a single acute angle part at a part of the outer periphery in the fiber cross section. An acrylic fiber has been proposed which has a curved portion at least at a part of the outer periphery other than the acute angle portion, and an inner angle of the acute angle portion is not less than 10 ° and not more than 60 ° (see Patent Document 2). However, when the acrylic fiber having a cross-sectional shape as proposed is a napped product, sharp corners enter into the gaps between the fibers, and the fibers are regularly arranged. There was a problem of ending up.

JP-A-8-260234 JP 2006-111985 A

  Then, the objective of this invention is providing the flat acrylic fiber and napped product which have a flexible texture, without impairing bulkiness and bristleiness.

  The present invention is to solve the above-mentioned problems, and the flat acrylic fiber having a soft texture according to the present invention has an average single fiber fineness of 2.2 to 4.4 dtex and a tensile strength of 2. 0 cN / dtex or more, the fiber cross section is flat, the long side length is A, and the short side length is B, the flatness ratio A / B is 4.0-10. The flat acrylic fiber is 0 and has a crimp number of 5 to 15 crests / 25 mm.

  According to the preferable aspect of the flat acrylic fiber of this invention, the hot-water shrinkage rate of the said flat acrylic fiber is 4% or less. In the present invention, this flat acrylic fiber may be referred to as a non-shrinkable flat acrylic fiber.

  According to the preferable aspect of the flat acrylic fiber of this invention, the hot-water shrinkage rate of the said flat acrylic fiber is 20-30%. In the present invention, this flat acrylic fiber is sometimes referred to as a shrinkable flat acrylic fiber.

  Further, the napped product of the present invention has 30 to 70% by mass of flat acrylic fibers (non-shrinkable flat acrylic fibers) having a hot water shrinkage rate of 4% or less, and the hot water shrinkage rate of 20 to 30%. % Of nail flat acrylic fibers (shrinkable flat acrylic fibers).

  According to the present invention, flat acrylic fibers and napped products having a soft texture can be obtained without impairing bulkiness and hairiness. The flat acrylic fiber obtained by the present invention makes it possible to provide a napped product having a soft texture when it is used alone or mixed with other fibers in a napped product such as a bore or a high pile.

  Furthermore, the napped product obtained by the present invention is a napped product having a soft texture without impairing bulkiness and bristleiness by setting the composition ratio of the fibers within a specific range.

  Next, the flat acrylic fiber of the present invention will be described in detail.

  The flat acrylic fiber of the present invention has an average single fiber fineness of 2.2 to 4.4 dtex, a tensile strength of 2.0 cN / dtex or more, a flat fiber cross section, and a long side length. A flat acrylic fiber having a flatness ratio A / B of 4.0 to 10.0 and a crimp number of 5 to 15/25 mm when the length is A and the length of the short side is B .

  The flat acrylic fiber of the present invention is a flat acrylic fiber made of a copolymer of at least 80% by mass of acrylonitrile and an ethylenic vinyl monomer copolymerizable with acrylonitrile up to 20% by mass. When the acrylonitrile in the flat acrylic fiber is less than 80% by mass, the fiber is inferior in physical properties and heat resistance.

  Examples of the ethylenic vinyl monomer copolymerizable with acrylonitrile include acrylic acid or methacrylic acid and esters thereof, acrylamide or methacrylamide and monoalkyl substituted products thereof, styrene, vinyl acetate, vinyl chloride, vinylidene chloride, vinyl Examples thereof include pyridine, styrene sulfonic acid, vinyl sulfonic acid, allyl sulfonic acid, methallyl sulfonic acid, and salts of these sulfonic acids.

  As a method for polymerizing the copolymer, any of suspension polymerization, emulsion polymerization, solution polymerization, and the like can be used. Examples of the organic solvent used include dimethyl sulfoxide, dimethylacetamide and dimethylformamide.

  The above copolymer is dissolved in a solvent such as acetone, acetonitrile, dimethyl sulfoxide, dimethylacetamide, dimethylformamide, rhodium salt concentrated solution, zinc chloride concentrated solution, and nitric acid to form a spinning dope. At this time, if necessary, a stabilizer effective for rust prevention, coloring prevention, and weather resistance can be added.

  In addition, an additive such as titanium oxide can be added for adjusting whiteness and gloss and imparting a function, but it is necessary to adjust the addition amount so as not to impair productivity. The spinning dope can be made into a fiber by a method such as wet spinning, dry spinning or dry / wet spinning.

  The average single fiber fineness of the flat acrylic fiber of the present invention is 2.2 to 4.4 dtex, and preferably 2.7 to 3.8 dtex. The thinner the average single fiber fineness, the more flexible. However, in a fiber having a high degree of irregularity such as the flat acrylic fiber of the present invention, if the average single fiber fineness is less than 2.2 dtex, Since cracks occur frequently, it becomes difficult to obtain fibers stably. Moreover, when the average single fiber fineness exceeds 4.4 dtex, the rigidity becomes strong and it becomes difficult to obtain sufficient flexibility.

  Further, the tensile strength of the flat acrylic fiber of the present invention is not particularly limited, but is required to be 2.0 cN / dtex or more. When the tensile strength is less than 2.0 cN / dtex, the processability such as the spinning process is deteriorated, and the productivity is remarkably lowered.

  The flat acrylic fiber of the present invention preferably has a simple flat shape in terms of fiber cross section. A simple flat shape refers to a simple shape such as a rectangle, an oval, an ellipse, or the like, and does not have a protrusion or an acute angle portion. When the flat shape has protrusions, the bulkiness and bristle performance are improved, but the rigidity is increased and the flexibility is impaired. Moreover, when a flat shape has an acute angle part, when setting it as a napped product, since the acute angle part will enter into the space | gap between fibers and a fiber will be arranged regularly, bulkiness and a softness | flexibility will be impaired.

  Further, the flat acrylic fiber of the present invention has a flatness ratio A / B of 4.0 to 10.0 when the length of the long side is A and the length of the short side is B, and the flatness ratio A / B is preferably 5.0 to 8.0. Here, the length A of the long side is the maximum value of the long side in the fiber cross section, and the length B of the short side is the maximum value of the short side in the fiber cross section.

  When the aspect ratio A / B is less than 4.0, the rigidity becomes strong and it becomes difficult to obtain sufficient flexibility. Further, when the flatness ratio A / B exceeds 10.0, the flexibility is improved, but the contact area between the fibers increases and the hair separation property deteriorates.

  The flat acrylic fiber of the present invention has a crimp number of 5 to 15 peaks / 25 mm, and preferably has a crimp number of 7 to 13 peaks / 25 mm. If the number of crimps is within this range, there is no problem in the card passing property, and good bulkiness is obtained due to the steric hindrance of the fiber.

  When the number of crimps is less than 5 peaks / inch, the steric hindrance of the fiber is small and the bulkiness is insufficient. Further, the card passing property is poor and the web is cut. On the other hand, when the number of crimps exceeds 15 peaks / 25 mm, the texture of the fibers is greatly stiff. Also, Nep frequently occurs when the card passes.

  The napped product of the present invention has a non-shrinkable flat acrylic fiber having a hot water shrinkage of 4% or less, 30 to 70% by weight, preferably 40 to 60% by weight, and a hot water shrinkage of 20 to 30%. Napped product containing 30 to 70% by mass, preferably 40 to 60% by mass of a flattened acrylic fiber.

  By making the non-shrinkable flat acrylic fiber and the shrinkable flat acrylic fiber into a composition ratio within such a specific range, the non-shrinkable flat acrylic fiber becomes stabbed when making a napped product, and the shrinkable flat acrylic fiber Since the fibers become nascent, napped products having a soft texture can be obtained without impairing the bristleiness and bulkiness. When the amount of non-shrinkable flat acrylic fiber is less than 30% by mass, the ratio of piercing is reduced, so that the hair separation property and flexibility are insufficient. When shrinkage flat raw cotton is less than 30 mass%, since the ratio of hair production decreases, the bulkiness is insufficient.

  As a manufacturing method of the napping product of this invention, it can select suitably from normal processing methods, such as a knitted bore, a woven bore, and a high pile, for example. Further, the raised length of the raised product of the present invention can be appropriately selected according to clothing usage such as a hat, a collar, and gloves, and interior usage such as a cushion and a mat.

  The napped product of the present invention is preferably composed of a spun yarn containing a non-shrinkable flat acrylic fiber and a shrinkable flat acrylic fiber. Examples of a method for producing the spun yarn include an average single fiber fineness and a cut of the flat acrylic fiber. Depending on the length, it can be appropriately selected from ordinary processing methods such as eyelashes, long spinning, short spinning, fluff and 2-inch spinning. In addition, the yarn count and cut length of the spun yarn can be appropriately selected according to clothing uses such as a hat, a collar, and gloves, and interior uses such as a cushion and a mat.

  The hot water shrinkage rate of the non-shrinkable flat acrylic fiber of the present invention is preferably 4% or less. When the hot water shrinkage rate exceeds 4%%, there is a tendency that the effect as a stab is not obtained when making napped products.

  Moreover, it is preferable that the hot water shrinkage rate of the shrinkable flat acrylic fiber of the present invention is 20 to 30%. When the hot water shrinkage rate is less than 20%, the bulkiness is insufficient, and when it exceeds 30%, it tends to be stiff and lack hairiness and flexibility.

  In the napped product of the present invention, within the above-mentioned composition ratio range, in addition to the non-shrinkable flat acrylic fiber and the shrinkable flat acrylic fiber, for the purpose of adjusting to the desired texture, the fineness and the fineness of the fineness Add fibers, add atypical cross-section fibers such as round cross section and dock bone cross section, or can add other fibers with each purpose function for the purpose of imparting antibacterial and antistatic properties, The kind of fiber to add is not limited.

  The flat acrylic fiber obtained by the present invention makes it possible to provide a napped product having a soft texture when it is used alone or mixed with other fibers in a napped product such as a bore or a high pile.

  Moreover, the nap product obtained by this invention turns into a nap product which has a soft texture, without impairing bulkiness and bristleiness property by making the structural ratio of a fiber into a specific range.

  Next, the flat acrylic fiber and napped product of the present invention and the effects thereof will be specifically described by way of examples.

(1) Measuring method of average single fiber fineness, tensile strength, crimp number, hot water shrinkage:
Measured by JIS L1015: 2010 chemical fiber staple test method.

(2) Measuring method of flatness:
Take 2 to 3 fibers from 20 or more of 3 g of flat acrylic fibers, and make a bundle of fibers by pulling them together, cut them through a small hole in a metal plate, cut both sides at right angles, and cross-section using a microscope. I took a picture. From the cross-sectional photograph, the maximum value A of the long side and the maximum value B of the short side in 30 fiber cross sections were measured, and the flatness ratio A / B was calculated.

(3) Evaluation method of texture of flat acrylic fiber:
Each flat acrylic fiber obtained in Examples and Comparative Examples was cut with a variable cut to an average fiber length of 102 mm and passed through a card to obtain a cotton spread. Using 10 g of cotton spread, sensory inspection was conducted by five judges to evaluate bulkiness, hair separation and flexibility.

  For each evaluation item, a circle was given when all 5 people were excellent, and a cross was given when even one was not good. As a comprehensive evaluation, a case where all items were ○ was judged as excellent (◎), and a case where there was △ was judged as not good (×).

(4) Evaluation of texture of napped products:
Using the flat acrylic fibers obtained in Examples and Comparative Examples, eyelash spinning was performed at the mixing ratio shown in Table 2 to obtain a spun yarn of 2/28 Nm. The obtained spun yarn was subjected to bulking and dyeing, and then knitting and cutting, and subsequent processes of brushing, polisher, and shirring, which are known pile processing methods, were performed to obtain napped products. A sensory test was conducted by five judges to evaluate the texture.
The case where all five people evaluated it as a soft texture was excellent (）), and the case where even one person evaluated it as a soft texture was regarded as not good (×).

[Example 1]
Solution polymerization was performed using dimethyl sulfoxide as a solvent to obtain an acrylonitrile copolymer consisting of 89% by mass of acrylonitrile, 10% by mass of methyl acrylate, and 1% by mass of sodium methallyl sulfonate. The polymerization solution containing the copolymer thus obtained was used as a spinning solution as it was, extruded from a rectangular nozzle with an aspect ratio of 8 and wet-spun, and the single fiber fineness was 3.2 dtex. The strength is 2.7 cN / dtex, the fiber cross section is a simple rectangular shape, the flatness ratio A / B is 7.0, the crimp number is 10 peaks / 25 mm, and the hot water shrinkage is A 2% non-shrinkable flat acrylic fiber was obtained. Since the bulkiness, bristleiness and flexibility of the resulting cotton spread were all good, the overall evaluation was excellent (（). The results are shown in Table 1.

[Comparative Example 1]
Using the same spinning dope as in Example 1, extrusion was performed from a rectangular nozzle with a flatness ratio of 8 and wet spinning was performed to obtain a flat acrylic fiber having a single fiber fineness of 1.7 dtex. However, yarn breakage frequently occurred during spinning. As a result, fibers could not be obtained. The results are shown in Table 1.

[Comparative Example 2]
Using the same spinning dope as in Example 1, extrusion from a rectangular nozzle with a flatness ratio of 8 and wet spinning, the single fiber fineness is 5.6 dtex, the tensile strength is 2.5 cN / dtex, and the fiber cross section is A non-shrinkable flat acrylic fiber having a simple rectangular shape with a flatness ratio A / B of 8.0, a crimp number of 9 peaks / 25 mm, and a hot water shrinkage rate of 2% was obtained. The bulkiness and bristleiness of the resulting cotton spread were ◯, but the flexibility was Δ, so the overall evaluation was not excellent (x). The results are shown in Table 1.

[Comparative Example 3]
Using the same spinning dope as in Example 1, extrusion from a rectangular nozzle with a flatness ratio of 4 and wet spinning, the single fiber fineness is 2.8 dtex, the tensile strength is 3.0 cN / dtex, and the fiber cross section is A non-shrinkable flat acrylic fiber having a simple rectangular shape with a flatness ratio A / B of 3.5, a crimp number of 10 peaks / 25 mm, and a hot water shrinkage rate of 1% was obtained. Although the bristle performance of the open cotton obtained in this way was ○, the bulkiness and flexibility were Δ, the overall evaluation was not excellent (x). The results are shown in Table 1.

[Comparative Example 4]
Using the same spinning dope as in Example 1, extruded from a rectangular nozzle with a flatness ratio of 12 and wet-spun, the single fiber fineness is 4.3 dtex, the tensile strength is 2.2 cN / dtex, and the fiber cross section is A non-shrinkable flat acrylic fiber having a simple rectangular shape with a flatness ratio A / B of 11.0, a crimp number of 10 peaks / 25 mm, and a hot water shrinkage rate of 3% was obtained. The bulkiness of the open cotton obtained in this way was ○, but the hair separation and flexibility were Δ, so the overall evaluation was not excellent (x). The results are shown in Table 1.

[Comparative Example 5]
Using the same spinning dope as in Example 1, extruded from a rectangular nozzle with a flatness ratio of 8 and wet-spun, the single fiber fineness is 3.2 dtex, the tensile strength is 2.7 cN / dtex, and the fiber cross section is A non-shrinkable flat acrylic fiber having a simple rectangular shape with a flatness ratio A / B of 7.0, a crimp number of 4 peaks / 25 mm, and a hot water shrinkage rate of 2% was obtained. Since the bulkiness, bristleiness and flexibility of the resulting cotton spread were all Δ, the overall evaluation was not excellent (x). Moreover, card | curd permeability was bad and the cotton opening was not stably obtained. The results are shown in Table 1.

[Comparative Example 6]
Using the same spinning dope as in Example 1, extruded from a rectangular nozzle with a flatness ratio of 8 and wet-spun, the single fiber fineness is 3.2 dtex, the tensile strength is 2.7 cN / dtex, and the fiber cross section is A non-shrinkable flat acrylic fiber having a simple rectangular shape with a flatness ratio A / B of 7.0, a crimp number of 18 peaks / 25 mm, and a hot water shrinkage rate of 2% was obtained. The bulkiness of the open cotton obtained in this way was ○, but the hair separation and flexibility were Δ, so the overall evaluation was not excellent (x). In addition, card passing ability was poor, and nep occurred frequently in opening. The results are shown in Table 1.

[Example 2]
Solution polymerization was performed using dimethyl sulfoxide as a solvent to obtain an acrylonitrile copolymer consisting of 87% by mass of acrylonitrile, 12% by mass of methyl acrylate, and 1% by mass of sodium methallyl sulfonate. The polymerization solution containing this copolymer is used as a spinning solution as it is, extruded from a rectangular nozzle with a flatness ratio of 8 and wet-spun, the single fiber fineness is 3.4 dtex, and the tensile strength is 3.0 cN / dtex. Shrinkable flat acrylic fiber having a simple rectangular cross section, flattening ratio A / B of 6.0, crimp number of 10 peaks / 25 mm, and hot water shrinkage of 22% Got. Since the bulkiness, bristleiness and flexibility of the resulting cotton spread were all good, the overall evaluation was excellent (評 価). The results are shown in Table 1.

[Example 3]
Titanium oxide was added to the same spinning stock solution as in Example 1 so that the content was 0.3% by mass with respect to the copolymer. Using this spinning solution, it was extruded from a rectangular nozzle with an aspect ratio of 8 and wet-spun, and the single fiber fineness was 3.3 dtex, the tensile strength was 2.5 cN / dtex, and the fiber cross section was a simple rectangular shape. Thus, a non-shrinkable flat acrylic fiber having a flatness ratio A / B of 7.0, a crimp number of 10 peaks / 25 mm, and a hot water shrinkage rate of 2% was obtained. Since the bulkiness, bristleiness and flexibility of the resulting cotton spread were all good, the overall evaluation was excellent (評 価). The results are shown in Table 1. Moreover, the glare peculiar to a synthetic fiber was suppressed by addition of titanium oxide, and the appearance quality was excellent.

[Example 4]
A napped product having 40% by mass of the non-shrinkable flat acrylic fiber of Example 1 and 60% by mass of the contracted acrylic fiber of Example 2 was produced. The texture evaluation of the napped product was ◎. The results are shown in Table 2.

[Example 5]
A napped product having 50% by mass of the non-shrinkable flat acrylic fiber of Example 3 and 50% by mass of the shrinkable flat acrylic fiber of Example 2 was produced. The texture evaluation of the napped product was ◎. Moreover, it had the appearance close | similar to natural fur by the synergistic effect of including the fiber without a glare and the fiber with a glare. The results are shown in Table 2.

[Comparative Example 7]
A napped product having 20% by mass of the non-shrinkable flat acrylic fiber of Example 1 and 80% by mass of the contracted acrylic fiber of Example 2 was produced. The texture evaluation of the napped product was x. The results are shown in Table 2.

[Comparative Example 8]
A napped product having 80% by mass of the non-shrinkable flat acrylic fiber of Example 1 and 20% by mass of the contracted acrylic fiber of Example 2 was produced. The texture evaluation of the napped product was x. The results are shown in Table 2.

[Example 6]
45% by mass of the non-shrinkable flat acrylic fiber of Example 1, 50% by mass of the shrinkable flat acrylic fiber of Example 2, 5% by mass of the round cross-section acrylic fiber having a single fiber fineness of 1.1 dtex and an average fiber length of 102 mm. A napped product was produced. The texture evaluation of the napped product was ◎. Moreover, compared with Example 4, it became a more flexible napped product. The results are shown in Table 2.

Claims (4)

  The average single fiber fineness is 2.2 to 4.4 dtex, the tensile strength is 2.0 cN / dtex or more, the fiber cross section is a flat shape, the length of the long side is A, and the short side A flat acrylic fiber having a flatness ratio A / B of 4.0 to 10.0 when the length is B, and a crimp number of 5 to 15 peaks / inch.   The flat acrylic fiber according to claim 1, having a hot water shrinkage of 4% or less.   The flat acrylic fiber according to claim 1, which has a hot water shrinkage of 20 to 30%.   A napped product comprising 30 to 70% by mass of the flat acrylic fiber according to claim 2 and 30 to 70% by mass of the flat acrylic fiber according to claim 3.