JP6614244B2 - Fiber and stuffed cotton - Google Patents

Description

The present invention relates to fibers and stuffed cotton.
This application claims priority based on Japanese Patent Application No. 2006-204936 for which it applied to Japan on October 19, 2016, and uses the content here.

  Various fibers such as acrylic fiber, nylon fiber, and polyester fiber have characteristics such as soft texture, heat retention, form stability, weather resistance, and dyeability, and are widely used in bedding, clothing and interior fields. Has been.

  In recent years, the price of feathers has soared, and chemical fiber is being used as a batting in the clothing and bedding fields as a substitute for feathers. It is known that feathers mainly used as padding for bedding and down jackets are rich in texture, light in weight, excellent in heat retention and bulkiness, and have a high recovery rate after compression. However, in order to obtain feathers, it is necessary to raise a large amount of waterfowl, which not only requires a large amount of feed, but also causes water pollution due to waterfowl excretion, or the occurrence and spread of infectious diseases. Yes. Moreover, in order to be able to use feathers as stuffed cotton, it is necessary to go through many processes such as hair collection, selection, disinfection, and degreasing. Furthermore, since the feathers soar during the process, the work becomes complicated. As a result, the price of bedding made of cotton filled with feathers is high.

  On the other hand, in the garment field, synthetic fibers have a lower official moisture content than natural fibers and have poor absorption and release properties. It is not a preferable material in terms of wearing comfort, such as generating static electricity.

  In order to eliminate these drawbacks, for example, Patent Document 1 proposes a hollow polyester fiber having a fineness of 4 to 18 dtex. However, the heat retaining property was not so high due to the large fineness in order to achieve bulkiness.

  Patent Document 2 proposes polyester fibers added with inorganic particles such as calcium hydroxide and magnesium hydroxide having excellent hydrophilicity, and Patent Documents 3 and 4 propose polyester fibers added with silica-based inorganic particles. However, the purpose is to improve the hygroscopicity, and there is no description regarding the improvement of bulkiness.

  Furthermore, Patent Document 5 proposes a fiber in which inorganic particles are fixed on the fiber surface by a binder as a moisture-absorbing heat-generating fiber.

JP-A-8-188918 JP 2001-192935 A JP 2001-348733 A JP 2002-363824 A JP 2002-180375 A

  An object of the present invention is to use a fiber having a specific shape of fiber pores, a stuffed cotton having excellent bulkiness while being a synthetic fiber, and a fiber having a specific shape for use in stuffed cotton having excellent bulkiness The object is to provide a fiber in which pores are formed.

[1] Inorganic fibers having an average particle diameter of 1 to 20 μm are contained inside the fiber, and fiber pores having a maximum width of 0.1 to 5 μm and a maximum length of 1 to 50 μm are formed in the fiber cross section in the fiber axis direction. Fibers.
[2] The fiber according to [1], wherein the content of the inorganic particles in the fiber (100% by mass) is 1 to 15% by mass.
[3] The fiber according to [1] or [2], wherein a coefficient of static friction _μs between fibers is 0.33 to 0.45.
[4] The fiber according to any one of [1] to [3], wherein the fiber is an acrylic fiber.
[5] A plurality of pores are formed in the inorganic particles, the pore volume of the inorganic particles is 0.3 to 2.0 mL / g, and the specific surface area of the inorganic particles is 200 to 800 m ² / g. The fiber according to any one of [1] to [4].
[6] The single fiber fineness is 0.5 to 20 dtex, the single fiber strength is 1.8 to 3.0 cN / dtex, and the single fiber elongation is 10 to 50%. [1] to [5] The fiber in any one of.
[7] The fiber according to any one of [1] to [6], wherein the down power is 270 to 400 cm ³ / g and the Clo value is 3 to 5.
[8] The maximum fiber temperature when the temperature is changed from an environment having a temperature of 20 ° C. and a humidity of 40% RH to an environment having a temperature of 20 ° C. and a humidity of 90% RH is 24 ° C. or higher, [1] to [7] The fiber according to any one of the above.
[9] A cotton pad using the fiber according to any one of [1] to [8].
[10] A stuffed cotton containing fiber A, wherein the content of fiber A in stuffed cotton (100% by mass) is 50 to 100% by mass, and the down power is 270 to 400 cm ³ / g, The fiber A is a stuffed cotton which is a fiber containing inorganic particles having an average particle diameter of 1 to 20 μm inside the fiber.
[11] The fiber A according to [10], wherein the fiber A is a fiber in which fiber pores having a maximum width of 0.1 to 5 μm and a maximum length of 1 to 50 μm are formed in a fiber cross section in the fiber axis direction. Stuffed cotton.
[12] The stuffed cotton according to [10] or [11], wherein the Clo value is 3 to 5.
[13] The stuffed cotton according to any one of [10] to [12], wherein the content of the inorganic particles in the fiber A (100% by mass) is 1 to 15% by mass.
[14] The stuffed cotton according to any one of [10] to [13], wherein the fiber A is an acrylic fiber.
[15] The pore volume of the inorganic particles is 0.3 to 2.0 mL / g, and the specific surface area of the inorganic particles is 200 to 800 m ² / g. Filled cotton as described.
[16] The inter-fiber static friction coefficient _μs of the fiber A is 0.33 to 0.45, the single fiber fineness of the fiber A is 0.5 to 20 dtex, and the single fiber strength of the fiber A is 1. The stuffed cotton according to any one of [10] to [15], which is 8 to 3.0 cN / dtex, and the single fiber elongation of the fiber A is 10 to 50%.
[17] The stuffed cotton according to any one of [10] to [16], further including a chemical fiber different from the fiber A, wherein the single fiber fineness of the chemical fiber is 0.5 to 2.2 dtex.
[18] Further, the heat-bonded short fibers include a heat-bonded short fiber, and the content of the heat-bonded short fibers in the stuffed cotton (100% by weight) is 5 to 30% by weight. The cotton pad according to any one of [10] to [17], which is bonded to the fiber A.

According to the present invention, inorganic particles having an average particle diameter of 1 to 20 μm are kneaded into the fibers, whereby fiber pores having a specific shape are formed in the fibers, and fibers having excellent bulkiness can be obtained. Using the fibers, it is possible to obtain stuffed cotton having excellent bulkiness.
The fiber of the present invention has moisture retention and moisture absorption exotherm in addition to excellent bulkiness.

The fiber sectional view of the fiber axis direction of the fiber of the present invention is shown. In FIG. 1, the direction of the arrow indicates the fiber axis direction.

[fiber]
The fiber of the present invention contains inorganic particles having an average particle diameter of 1 to 20 μm inside the fiber, and the fiber cross section in the fiber axis direction has a maximum width of 0.1 to 5 μm and a maximum length of 1 to 50 μm. It is a fiber in which holes are formed.

The average particle diameter of the inorganic particles contained in the fiber of the present invention is 1 to 20 μm.
If the average particle diameter of the inorganic particles is 1 μm or more, fiber pores tend to exist in the fiber axis direction, and if it is 20 μm or less, the spinnability tends to be good. From these viewpoints, the average particle diameter of the inorganic particles is more preferably 1 to 10 μm, and further preferably 2 to 5 μm.

In the fiber of the present invention, the maximum width of the fiber pore formed in the fiber cross section in the fiber axis direction is 0.1 to 5 μm.
If the maximum width of the fiber pore is 0.1 μm or more, the bulkiness is easily increased, and if it is 5 μm or less, the fiber breakage is easily reduced. From these viewpoints, the maximum width of the fiber pore is more preferably 1 to 4 μm, and further preferably 2 to 3 μm.
In the fiber of the present invention, the maximum width of the fiber pore is defined as the width of the portion taking the maximum value among the widths in the minor axis direction of one fiber pore cross section formed in the fiber cross section in the fiber axis direction. say. In FIG. 1, the maximum width of the fiber pores is indicated by B.

In the fiber of the present invention, the maximum length of the fiber pore formed in the fiber cross section in the fiber axis direction is 1 to 50 μm.
If the maximum maximum length is 1 μm or more, the bulkiness is easily increased, and if it is 50 μm or less, fiber breakage is easily reduced. From these viewpoints, the maximum length of the fiber pore is more preferably 10 to 45 μm, and further preferably 20 to 40 μm.
In the fiber of the present invention, the maximum length of the fiber pore is the length of the portion that takes the maximum value among the lengths in the major axis direction of one fiber pore section formed in the fiber section in the fiber axis direction. Say. In FIG. 1, the maximum length of the fiber pore is indicated by A.

The content of inorganic particles contained in the fiber (100% by mass) of the present invention is preferably 1 to 15% by mass.
If the content of the inorganic particles is 1% by mass or more, it is easy to increase the down power of the stuffed cotton when the stuffed cotton is used. Becomes better. From these viewpoints, the content of the inorganic particles is more preferably 1 to 10% by mass, and further preferably 3 to 8% by mass.

The inorganic particles contained in the fiber of the present invention are preferably silica-based inorganic fine particles.
Specifically among the inorganic particles (100 mass%) is more than 50 mass% is an inorganic particles composed of SiO _2, the SiO ₂ content in the inorganic particles (100 mass%) is more than 95 wt% More preferred. SiO ₂ is preferably wet silica from the viewpoint that the pore volume and specific surface area are large and the fiber pores in the fiber can be enlarged, and specific examples include white carbon, silica sol, silica gel, and synthetic silica. .

The fibers of the present invention preferably have a coefficient of static friction _μs between fibers of 0.33 to 0.45.
If the static friction coefficient μ _s is 0.33 or more, the shape of the stuffed cotton is easy to maintain and the bulkiness is easily increased, and if it is 0.45 or less, the resilience of the stuffed cotton tends to be good. From these viewpoints, the static friction coefficient μ _s is more preferably 0.34 to 0.42.

The fibers of the present invention are preferably acrylic fibers.
By using acrylic fiber, fiber pores can be easily formed inside the fiber.

  When the fiber of the present invention is an acrylic fiber, the acrylonitrile-based copolymer having an acrylonitrile unit used for the acrylic fiber as a main constituent unit is composed of 80% by mass or more of an acrylonitrile unit and can be copolymerized with acrylonitrile. Any monomer can be used in combination. For example, acrylic acid alkyl esters such as methyl acrylate and ethyl acrylate, neutral monomers such as styrene, vinyl acetate, vinyl chloride, vinylidene chloride, vinyl ethyl ether, methacrylonitrile, acrylic acid, methacrylic acid, allyl sulfone 20% by mass or less of a suitable combination of acidic monomers such as acid, methallylsulfonic acid, styrenesulfonic acid, 2-acrylamido-2-methylpropanesulfonic acid, and ammonium salts and alkali metal salts of these monomers In this ratio, those copolymerized with 80% by mass or more of acrylonitrile. This acrylonitrile copolymer may be produced by any method such as suspension polymerization, solution polymerization, emulsion polymerization and the like.

The inorganic particles contained in the fiber of the present invention preferably have a plurality of pores.
In the case where a plurality of pores are formed in the inorganic particles, the pore volume of the inorganic particles is preferably 0.3 to 2.0 mL / g.
If the pore volume of the inorganic particles is 0.3 mL / g or more, it is easy to increase the down power when stuffed with cotton, and if it is 2.0 mL / g or less, the liquid in which the inorganic particles are dispersed has a high viscosity. It is difficult and can be manufactured industrially. From these viewpoints, the pore volume of the inorganic particles is more preferably 0.5 to 2.0 mL / g, and further preferably 1.0 to 2.0 mL / g.
The pore volume was measured according to JISZ8831-2 (2010) [ISO 15901-2 (2006)].

Moreover, it is preferable that the specific surface area of the inorganic particle contained in the fiber of this invention is 200-800 m < ² > / g.
If the specific surface area of the inorganic particles is 200 m ² / g or more, it is easy to increase the down power when stuffed with cotton, and if it is 800 m ² / g or less, the pore volume required to form fiber pores of the fiber is easily obtained. . From these viewpoints, the specific surface area of the inorganic particles is more preferably 200~800m ² / g, more preferably 300 to 600 m ² / g.
The specific surface area was measured by the BET method of JISZ8830 (2013) [ISO9277 (2010)].

Moreover, as one aspect, the inorganic particles contained in the fiber of the present invention have a plurality of pores, and the pore volume of the inorganic particles is 0.3 to 2.0 mL / g. 200-800 m < ² > / g may be sufficient as the specific surface area of the inorganic particle contained.

The fiber of the present invention preferably has a single fiber fineness of 0.5 to 20 dtex.
If the single fiber fineness is 0.5 dtex or more, the fibers are difficult to cut during spinning, and the spinnability is good. If it is 20 dtex or less, the down power and Clo value are likely to be high when stuffed cotton. From these viewpoints, the single fiber fineness is more preferably 0.8 to 10 dtex, and further preferably 1.0 to 7.8 dtex.

The fiber of the present invention preferably has a single fiber strength of 1.8 to 3.0 cN / dtex.
If the single fiber strength is 1.8 cN / dtex or more, it is easy to reduce the amount of fly that is generated by cutting the single fiber in the carding process when producing stuffed cotton, and 3.0 cN / dtex is sufficient. Easy to strength. From these viewpoints, the single fiber strength is more preferably 2.0 to 2.8 cN / dtex.

The fibers of the present invention preferably have a single fiber elongation of 10 to 50%.
If the single fiber elongation is 10% or more, fly does not easily occur in the spinning and opening process, and if it is 50% or less, the passability tends to be good in the spinning and opening process. From these viewpoints, the single fiber elongation is more preferably 20 to 40%.

  Moreover, as an aspect, the fiber of the present invention has a single fiber fineness of 0.5 to 20 dtex, a single fiber strength of 1.8 to 3.0 cN / dtex, and a single fiber elongation of 10 to 50%. There may be.

The fiber of the present invention preferably has a down power of 270 to 400 cm ³ / g.
If fibers of the down power 270 cm 3 / ^g or more, when used as a wadding, bulk tends to be high, it is possible to lose weight cotton amount used, as long as the following 400 cm 3 / ^g, the product When used as stuffed cotton, it is easy to make it compact even when compressed. From these viewpoints, the fiber down power is more preferably 270~380cm ³ / g, more preferably 300~350cm ³ / g.

The fiber of the present invention preferably has a Clo value of 3 to 5.
If the Clo value of the fiber of the present invention is 3 or more, when used as stuffed cotton, a heat retention effect is easily obtained even with a small amount, and if it is 5 or less, it is difficult to become too thick when made into a product. From these viewpoints, the Clo value is more preferably 3.5 to 4.5.

In one embodiment, the fiber of the present invention may have a down power of 270 to 400 cm ³ / g and a Clo value of 3 to 5.

The fiber of the present invention preferably has a maximum fiber temperature of 24 ° C. or higher when the temperature is changed from an environment of 20 ° C. and a humidity of 40% RH to an environment of a temperature of 20 ° C. and a humidity of 90% RH.
If the maximum reached fiber temperature under the above conditions is 24 ° C. or higher, it is easy to feel warmth by human touch.

[Stuffed cotton]
One aspect of the cotton pad of the present invention is a cotton pad using the fiber of the present invention.
By using the fiber of the present invention, it is possible to obtain stuffed cotton having excellent bulkiness.

Another aspect of the stuffed cotton of the present invention contains the fiber A, the content of the fiber A contained in the stuffed cotton (100% by mass) is 50 to 100% by mass, and the down power is 270 to 400 cm ^3. The fiber A is stuffed cotton that contains inorganic particles with an average particle diameter of 1 to 20 μm inside the fiber.

If the content of the fiber A in the stuffed cotton is 50% by mass or more, the bulkiness of the stuffed cotton is easily increased, and if it is 100% by mass or less, the desired bulkiness is easily obtained. From these viewpoints, the content of the fiber A is preferably 60% by mass or more, and more preferably 70% by mass or more.
If the desired bulkiness is obtained, other fibers can be mixed.
Examples of other fibers include fibers having antibacterial and deodorant functions, natural fibers such as wool, and heat-sealing fibers. In the present invention, feathers are included.

If the down power of the stuffed cotton is 270 cm ³ / g or more, the amount of cotton used as the stuffed cotton can be easily reduced, and if it is 400 cm ³ / g or less, it can be compressed when used as stuffed cotton for products. Easy to make compact. From these viewpoints, down power of wadding is preferably ^{280~380cm 3 / g, 300~350cm 3 /} g is more preferable.

In the stuffed cotton of the present invention, the fiber A is preferably a fiber in which fiber pores having a maximum width of 0.1 to 5 μm and a maximum length of 1 to 50 μm are formed in the fiber cross section in the fiber axis direction.
If the maximum width of the fiber pore is 0.1 μm or more, it is easy to increase the down power of the stuffed cotton, and if it is 5 μm or less, the fiber strength is unlikely to decrease and the fiber is difficult to break. From these viewpoints, the maximum width of the fiber pore is more preferably 1 to 4 μm.
If the maximum length of the fiber pore is 1 μm or more, it is easy to increase the down power of the stuffed cotton, and if it is 50 μm or less, the fiber strength is unlikely to decrease and the fiber is difficult to break. From these viewpoints, the maximum length of the fiber pore is more preferably 10 to 45 μm.

The stuffed cotton of the present invention preferably has a Clo value of 3-5.
If the Clo value is 3 or more, it is easy to obtain a heat retaining effect even with a small amount, and if it is 5 or less, it is difficult to make the product too thick. From these viewpoints, the Clo value is more preferably 3.5 to 4.5.

In the stuffed cotton of the present invention, the content of inorganic particles contained in the fiber A (100% by mass) is preferably 1 to 15% by mass.
If the content of the inorganic particles is 1% by mass or more, the fiber pores are likely to be large, and when it is made into stuffed cotton, it is easy to increase the down power of the stuffed cotton. It is easy to reduce the amount and it is easy to maintain bulkiness. From these viewpoints, the content of the inorganic particles contained in the fiber A is more preferably 1 to 10% by mass, and further preferably 3 to 8% by mass.

In the stuffed cotton of the present invention, the fiber A is preferably an acrylic fiber.
By using an acrylic fiber, fiber pores can be easily formed inside the fiber, and the bulkiness can be easily increased.

In the stuffed cotton of the present invention, the inorganic particles contained in the fiber A preferably have a plurality of pores.
In the case where a plurality of pores are formed in the inorganic particles, the pore volume of the inorganic particles is preferably 0.3 to 2.0 mL / g.
If the pore volume of the inorganic particles is 0.3 mL / g or more, the down power of the stuffed cotton is easily increased, and if it is 2.0 mL / g or less, the breakage of the fiber A in the article is easily reduced. From these viewpoints, the pore volume of the inorganic particles is more preferably 0.5 to 2.0 mL / g, and further preferably 1.0 to 2.0 mL / g.

In the stuffed cotton of the present invention, the specific surface area of the inorganic particles contained in the fiber A is preferably 200 to 800 m ² / g.
If the specific surface area of the inorganic particles is 200 m ² / g or more, the fiber pores in the fiber will increase, and it will be easy to increase the down power of the stuffed cotton, and if it is 800 m ² / g or less, the fiber pores of the fiber A It is easy to make the pore volume necessary for formation. From these viewpoints, the specific surface area of the inorganic particles is more preferably 200~800m ² / g, more preferably 300 to 600 m ² / g.

Moreover, as one aspect, in the cotton pad of the present invention, the inorganic particles contained in the fiber A are formed with a plurality of pores, and the pore volume of the inorganic particles is 0.3 to 2.0 mL / g, The specific surface area of the inorganic particles contained in the fiber A may be 200 to 800 m ² / g.

In the stuffed cotton of the present invention, the inter-fiber static friction coefficient μ _s of the fiber A is preferably 0.33 to 0.45.
If the inter-fiber static friction coefficient _μs is 0.33 or more, the shape of the stuffed cotton is easily maintained and the bulkiness is easily increased, and if it is 0.45 or less, the resilience of the stuffed cotton is likely to be good. .

In the stuffed cotton of the present invention, the single fiber fineness of the fiber A is preferably 0.5 dtex to 20 dtex.
If the single fiber fineness is 0.5 dtex or more, the breakage of the fiber A in the article is easily reduced, and if it is 20 dtex or less, the bulkiness of the stuffed cotton is easily increased. From these viewpoints, the single fiber fineness is more preferably 0.8 to 10 dtex, and further preferably 1.0 to 7.8 dtex.

In the stuffed cotton of the present invention, the single fiber strength of the fiber A is preferably 1.8 to 3.0 cN / dtex.
If the single fiber strength is 1.8 cN / dtex or more, breakage of the stuffed cotton in the article is easily reduced, and if it is 3.0 cN / dtex or less, sufficient strength is easily obtained. From these viewpoints, the single fiber strength is more preferably 2.0 cN / dtex or more, and further preferably 2.2 cN / dtex or more.

In the stuffed cotton of the present invention, the single fiber elongation of the fiber A is preferably 10 to 50%.
If the single fiber elongation is 10% or more, the rigidity of the fiber is small and it is easy to obtain a soft texture, and if it is 50% or less, the compression recovery property tends to be good. From these viewpoints, the single fiber elongation is more preferably 20 to 40%.

Further, as one aspect, in the cotton pad of the present invention, the inter-fiber static friction coefficient μ _s of the fiber A is 0.33 to 0.45, the single fiber fineness of the fiber A is 0.5 to 20 dtex, and the fiber A The single fiber strength of the fiber A may be 1.8 to 3.0 cN / dtex, and the single fiber elongation of the fiber A may be 10 to 50%.

The stuffed cotton of the present invention may further contain a chemical fiber different from the fiber A having a single fiber fineness of 0.5 to 2.2 dtex.
By including a chemical fiber having a specific single fiber fineness different from the fiber A, it becomes easy to impart functions such as antibacterial properties and deodorizing properties.
If the single fiber fineness of the chemical fiber different from the fiber A is 0.5 dtex or more, the breakage of the fiber A in the article is easily reduced, and if it is 2.2 dtex or less, the heat retention is easily improved. From these viewpoints, the single fiber fineness of the chemical fiber different from the fiber A is more preferably 0.6 to 2.0 dtex, and further preferably 0.7 to 1.5 dtex.
The chemical fiber includes synthetic fiber, semi-synthetic fiber, recycled fiber, and inorganic fiber, and in the present invention, means a fiber described in JIS L0204-2.

The stuffed cotton of the present invention further includes a heat-bonded short fiber, the content of the heat-bonded short fiber contained in the stuffed cotton (100% by weight) is 5 to 30% by weight, and is at least one of the heat-bonded short fibers. The part may be bonded to the fiber A.
If the content of the heat-bonded short fibers is 5% by mass or more, it is easy to obtain the effect of preventing the stuffed cotton from shifting, and if it is 30% by mass or less, it is easy to suppress bulkiness and heat retention. From these viewpoints, the content of the heat-bonding short fibers is preferably 6 to 25% by mass, and more preferably 7 to 20% by mass.
Moreover, it becomes easy to maintain bulkiness because at least one part of the heat-bonding short fiber is bonded to the fiber A.

[Fiber manufacturing method]
The fiber of the present invention can be obtained by a wet spinning method or a dry-wet spinning method, but the wet spinning method is desirable in terms of productivity and cost.

  For example, when the fiber of the present invention is an acrylic fiber, the method for producing the fiber of the present invention is performed by adding 10 to 20 mass of inorganic particles having an average particle diameter of 1 to 20 μm in a solution in which the acrylonitrile-based copolymer is dissolved in a solvent. % Is uniformly mixed with a solution in which an acrylonitrile copolymer is dissolved in a solvent to prepare a spinning dope, which is spun.

  Any solvent may be used as long as it can dissolve the acrylonitrile copolymer. Examples thereof include organic solvents such as dimethylformamide, dimethylacetamide, dimethylsulfoxide, and acetone. Among them, dimethylacetamide is preferable from the viewpoint of productivity in fiber production and physical properties of the obtained acrylic fiber.

In order to mix the inorganic particles with the solution in which the acrylonitrile copolymer is dissolved in the solvent, a dispersion liquid in which the inorganic particles are dispersed may be added.
The dispersion is preferably composed of 3 to 10% by mass of an acrylonitrile copolymer, 3 to 30% by mass of inorganic particles, and 60 to 90% by mass of a solvent. A concentration of inorganic particles in the dispersion of 3 parts by mass or more and 30 parts by mass or less is preferable because a good dispersion state is easily obtained and spinnability is good. From these viewpoints, the concentration of inorganic particles in the dispersion is more preferably 5 to 20 parts by mass.

  The spinning dope is preferably composed of 15 to 30 parts by mass, preferably 18 to 25 parts by mass of an acrylonitrile copolymer, 1.5 to 6 parts by mass of inorganic particles, and 70 to 85 parts by mass of a solvent. . If the content of the acrylonitrile copolymer in the spinning dope is within the above range, the spinnability tends to be good from the viewpoint of yarn breakage and productivity.

  The dissolution temperature for dissolving the acrylonitrile copolymer in the solvent is preferably 40 to 95 ° C. A melting temperature of 40 ° C. or higher is preferable because the amount of undissolved material is small, the use period of the filter medium in the filter equipment such as a filter press can be increased accordingly, and the spinnability is not impaired. On the other hand, a melting temperature of 95 ° C. or lower is preferable because the copolymer hardly changes color.

  Moreover, it is preferable that the temperature of the spinning dope after dissolving an acrylonitrile-type copolymer in a solvent is 40-95 degreeC. If the temperature of the spinning dope is within the above range, the spinning property of the spinning dope, the increase in nozzle pressure due to low viscosity, gelation of the spinning dope, etc. can be easily prevented, and the spinning property is good.

Next, the spinning dope is discharged from a plurality of discharge holes of the spinning nozzle into an aqueous solution having a solvent concentration of 40 to 60% by mass and a temperature of 35 to 50 ° C. to obtain a coagulated fiber bundle.
If the solvent concentration and temperature are within the above ranges, solidification does not become too fast, and a fiber having good card passing properties can be produced.

The jet stretch when discharging from the discharge hole of the spinning nozzle is preferably 0.4 to 2.2. The jet stretch is a value obtained by dividing the take-up speed of the coagulated yarn by the discharge linear speed.
If the jet stretch is 0.4 or more, it is preferable in that the nozzle pressure is difficult to increase and the continuous production time becomes long, and if it is 2.2 or less, yarn breakage in the spinning bath is easily reduced, and spinnability is improved. Tends to be good. From these viewpoints, the jet stretch is more preferably 0.6 to 2.0.
The jet stretch can be calculated by dividing the take-up speed for spinning out by the discharge linear speed.

Further, the coagulated fiber bundle is stretched in hot water at a stretch ratio of 2 to 6 times, oiled, and dried.
If the draw ratio in hot water is 2 times or more, it is easy to obtain the single fiber strength and single fiber elongation required for spinning and cotton opening process, and if it is 6 times or less, yarn breakage due to spinning is reduced. Cheap.

  The temperature of hot water when stretching in hot water is preferably 80 to 98 ° C. Within this range, it is easy to prevent the fibers from being cut during stretching in hot water.

  The swelling degree of the fiber drawn with hot water is preferably in the range of 80 to 250%. If the degree of swelling is within the above range, the drying property and productivity are likely to be good.

  The dried fiber bundle is crimped and stored in a container.

Thereafter, heat relaxation treatment is performed so that the fiber stored in the container shrinks by 5 to 40% to obtain a fiber.
The thermal relaxation condition is defined by the degree of thermal shrinkage of the fiber, and if the thermal shrinkage of the fiber is 5 to 40%, the single fiber strength and single fiber elongation required in the spinning and cotton opening process are preferable.
Thermal shrinkage is the ratio of shrinkage of the fiber bundle before and after thermal relaxation treatment.
The temperature for heat relaxation is 120 to 145 ° C. If the temperature for heat relaxation is 120 ° C. or higher, it is easy to obtain single fiber strength and single fiber elongation with good card passing properties during spinning. If it is 145 ° C. or lower, single fibers with good fiber texture are obtained. Easy to obtain.

  When the fiber of the present invention is a fiber other than an acrylic fiber, the fiber of the present invention other than an acrylic fiber can be produced according to a method obvious to those skilled in the art or the method for producing an acrylic fiber.

  EXAMPLES Hereinafter, although an Example and a comparative example are shown and this invention is demonstrated in detail, this invention is not limited to these Examples.

(Measurement method of specific surface area and pore volume)
Measured by the nitrogen adsorption method of JISZ8830 and JISZ8831-2: 2010, the specific surface area was analyzed by the BET method, and the pore volume was analyzed by the BJH method.

(Measurement method of the maximum width and length of fiber pores in the fiber axis direction)
A small amount of fiber was collected from the obtained raw cotton, and was collected and embedded in a flat plate with UV-cured acrylic syrup. The longitudinal section of the fiber was cut by a microtome equipped with a glass knife. The specimen was affixed to the SEM sample stage and bonded and fixed with a carbon paste. Pt was coated for 20 seconds under a condition of an ion current of 20 mA (coating thickness: about 5 nm) by a turbo sputtering apparatus (K575XD manufactured by EMITECH). The apparatus used was JEOL JSM-6060A, and the measurement was performed at an applied voltage of 10 kV, a probe current of 30, and an observation magnification of 3000 times and 5000 times. The SEM image was enlarged and printed on A3, and the maximum value in the major axis direction and the minor axis direction of the fiber pore cross section formed on the fiber cross section with a ruler was measured and converted.

(Measurement method of average particle size)
The average particle size was measured according to JIS Z 8825 (2013).

(Measurement of fineness, strength, elongation and static friction coefficient of single fiber)
It measured based on JIS L1015 (2010).

(Down power measurement method)
The down power was measured according to JIS L1903. The pretreatment was performed by the steam method.

(Clo value measurement method)
Thermolab II The heat retention rate was measured by the dry contact method.
1. A sample in which 10 g of cotton is packed in a 20 cm square cushion cover (fabric: 100% cotton) is prepared.
2. A sample prepared on a hot plate set to 20 ° C. is set using a KES-F7 Thermolab II tester manufactured by Kato Tech Co., Ltd.
3. Obtain the amount of heat (a) radiated through the sample under a windy condition of 30 cm / sec.
4). The amount of heat (b) dissipated without setting the sample is obtained, and the Clo value is calculated by Equation 1.
Clo value = 0.645 × {1 / (ab)}
The higher the Clo value, the better the heat retention.

(Hygroscopic exotherm measurement)
It was measured by a hygroscopic exothermic method test method BQE A 035-2011 created by Boken Quality Evaluation Organization.
5 g of material is collected, put into a polyester mesh net, processed in a dryer for 4 hours, and left overnight in a desiccator containing silica gel. A thermocouple temperature sensor is attached to the center of the sample after the treatment to prepare a test specimen. After treating the specimen for 2 hours in an environment of 20 ° C. and 40% RH using a thermo-hygrostat, 1 minute for each temperature when changing the setting of the thermo-hygrostat to 20 ° C. and 90% RH Every 15 minutes, the maximum temperature reached was confirmed.

Example 1
An acrylonitrile copolymer consisting of 93% by mass of acrylonitrile units and 7% by mass of vinyl acetate units is dissolved in dimethylacetamide, and the copolymer concentration is 24.3% by mass and the viscosity at 50 ° C. is 400 poise. Got.
Furthermore, 6% by mass of an acrylonitrile copolymer comprising 93% by mass of acrylonitrile units and 7% by mass of vinyl acetate units, silica-based inorganic fine particles (Silysia 301P manufactured by Fuji Silysia Chemical Ltd., pore volume 1.6 mL / g, specific surface area 300 m ² / G, average particle size of 2.7 μm) 12% by mass and 82% by mass of dimethylacetamide, a mixture (1) in which the acrylonitrile copolymer is dissolved in dimethylacetamide and the silica-based inorganic fine particles are uniformly mixed. Obtained.
The acrylonitrile-based copolymer solution and the mixture (1) are uniformly mixed so that the amount of the silica-based inorganic fine particles is 5% by mass with respect to the total amount of the acrylonitrile-based copolymer and the silica-based inorganic fine particles. Thus, a spinning dope was obtained.
This spinning dope is discharged from a plurality of discharge holes having a hole diameter of 0.060 mm into an aqueous solution having a dimethylacetamide concentration of 56 mass% and a temperature of 41 ° C. to form a fiber bundle, and while washing the solvent in 98 ° C. hot water, 5 The film was stretched 5 times. Subsequently, the oil agent was adhered, dried with a plurality of heat rollers whose surface temperature was set to 150 ° C., crimped, and then shaken off into a container.
Furthermore, a heat relaxation treatment was performed so that the fiber bundle contracted by 20%, and then cut into short fibers to obtain acrylic fibers having a single fiber fineness of 2.0 dtex and a fiber length of 38 mm. The fiber properties are shown in Table 1.

(Example 2)
Spinning was performed in the same manner as in Example 1 except that the mixing ratio of the acrylonitrile copolymer solution and the mixture (1) was changed so that the content of silica-based inorganic fine particles in the fiber was 3% by mass. Fiber was obtained. The fiber properties are shown in Table 1.

(Example 3)
Spinning was performed in the same manner as in Example 1 except that the hole diameter of the discharge hole was changed to 0.100 mm and the single fiber fineness was 6 dtex to obtain an acrylic fiber. The fiber properties are shown in Table 1.

(Comparative Example 1)
Spinning was carried out in the same manner as in Example 1 except that the mixture (1) containing silica-based inorganic fine particles was not mixed at the time of spinning, and only the acrylonitrile-based copolymer solution was used for spinning to obtain acrylic fibers. The fiber properties are shown in Table 1.

(Comparative Example 2)
Only the acrylonitrile copolymer solution was used without mixing the mixture (1) containing silica-based inorganic fine particles during spinning, and the mixture was discharged from a plurality of discharge holes having a hole diameter of 0.100 mm so that the single fiber fineness was 6 dtex. Except for the above, spinning was performed in the same manner as in Example 1 to obtain an acrylic fiber. The fiber properties are shown in Table 1.

Example 4
100% by mass of the acrylic fiber obtained in Example 1 was opened with a card machine to obtain stuffed cotton. Table 2 shows the measurement results of down power and Clo value of the padding cotton.

(Example 5)
100% by mass of the acrylic fiber obtained in Example 2 was opened with a card machine to obtain stuffed cotton. Table 2 shows the measurement results of down power and Clo value of the padding cotton.

(Example 6)
50% by mass of acrylic fiber obtained in Example 1 and 50% by mass of acrylic fiber A containing no porous silica (manufactured by Mitsubishi Chemical Corporation, product number: S616, single fiber fineness: 0.8 dtex, fiber length: 38 mm) After that, cotton was opened with a card machine to obtain stuffed cotton. Table 2 shows the measurement results of down power and Clo value of the padding cotton.
The bulkiness was 286 cm ³ / g, and the bulkiness was excellent.

(Example 7)
50% by mass of the acrylic fiber obtained in Example 2 and 50% by mass of the acrylic fiber A not containing porous silica were mixed and then opened with a card machine to obtain stuffed cotton. Table 2 shows the measurement results of down power and Clo value of the padding cotton.
The bulkiness was 277 cm ³ / g, and the bulkiness was excellent.

(Example 8)
70% by mass of the acrylic fiber obtained in Example 1 and 30% by mass of the acrylic fiber A not containing porous silica were mixed and then opened with a card machine to obtain stuffed cotton. Table 2 shows the measurement results of the down power of the stuffed cotton.
The bulkiness was 301 cm ³ / g, and the bulkiness was excellent.

Example 9
70% by mass of the acrylic fiber obtained in Example 2 and 30% by mass of the acrylic fiber A not containing porous silica were mixed, and then opened with a card machine to obtain stuffed cotton. Table 2 shows the measurement results of down power and Clo value of the padding cotton.
The bulkiness was 279 cm ³ / g and the bulkiness was excellent.

(Comparative Example 3)
100% by mass of the acrylic fiber A containing no porous silica was opened with a card machine to obtain stuffed cotton. Table 2 shows the measurement results of down power and Clo value of the padding cotton.
The bulkiness was 275 cm ³ / g, which was inferior to the bulkiness.

  In the table, “-” indicates that the value is not measured.

1 Fiber 3 Fiber pore A Maximum length of fiber pore B Maximum width of fiber pore

Claims (18)

Inorganic particles having an average particle diameter of 1 to 20 μm are contained in the fiber, the specific surface area of the inorganic particles is 300 to 800 m ² / g, and the content of SiO _{2 in} the inorganic particles (100% by mass) is 95. Fiber in which fiber pores having a maximum width of 0.1 to 5 μm and a maximum length of 1 to 50 μm are formed in the fiber cross section in the fiber axis direction.   The fiber according to claim 1, wherein the content of the inorganic particles in the fiber (100% by mass) is 1 to 15% by mass.   The fiber according to claim 1 or 2, wherein a coefficient of static friction μs between fibers is 0.33 to 0.45.   The fiber according to any one of claims 1 to 3, wherein the fiber is an acrylic fiber.   The fiber according to any one of claims 1 to 4, wherein a plurality of pores are formed in the inorganic particles, and the pore volume of the inorganic particles is 0.3 to 2.0 mL / g.   The single fiber fineness is 0.5 to 20 dtex, the single fiber strength is 1.8 to 3.0 cN / dtex, and the single fiber elongation is 10 to 50%. Fiber as described in. The fiber as described in any one of Claims 1-6 whose down power is 270-400 cm < ³ > / g and Clo value is 3-5.   The maximum attainable fiber temperature when changing from an environment of temperature 20 ° C and humidity 40% RH to an environment of temperature 20 ° C and humidity 90% RH is 24 ° C or higher. The described fiber.   Stuffed cotton using the fiber according to any one of claims 1 to 8. It is a stuffed cotton containing fiber A, the content of fiber A in stuffed cotton (100% by mass) being 50 to 100% by mass, and the down power being 270 to 400 cm ³ / g, wherein the fiber A is a fiber having an average particle diameter contains inorganic particles of 1~20μm inside the fibers, the specific surface area of the inorganic particles 300~800m ² / g der Ri, SiO ₂ of the inorganic in the particles (100 mass%) der Ru, wadding content less than 95% by weight.   The stuffed cotton according to claim 10, wherein the fiber A is a fiber in which fiber pores having a maximum width of 0.1 to 5 µm and a maximum length of 1 to 50 µm are formed in a fiber cross section in the fiber axis direction.   The stuffed cotton according to claim 10 or 11, having a Clo value of 3 to 5.   The cotton stuffing as described in any one of Claims 10-12 whose content of the said inorganic particle in the said fiber A (100 mass%) is 1-15 mass%.   Stuffed cotton according to any one of claims 10 to 13, wherein the fiber A is an acrylic fiber.   The cotton stuffing as described in any one of Claims 10-14 whose pore volume of the said inorganic particle is 0.3-2.0 mL / g.   The inter-fiber static friction coefficient μs of the fiber A is 0.33 to 0.45, the single fiber fineness of the fiber A is 0.5 to 20 dtex, and the single fiber strength of the fiber A is 1.8 to 3. The stuffed cotton according to any one of claims 10 to 15, which is 0 cN / dtex, and the single fiber elongation of the fiber A is 10 to 50%.   Furthermore, the cotton stuffing as described in any one of Claims 10-16 containing the chemical fiber different from the said fiber A, and the single fiber fineness of the said chemical fiber is 0.5-2.2 dtex.   Furthermore, the heat-bonding short fibers contain 5 to 30% by mass of the heat-bonding short fibers in the stuffed cotton (100% by mass), including at least a part of the heat-bonding short fibers. The stuffed cotton as described in any one of Claims 10-17 currently adhere | attached.

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