JP6498873B2 - Functional fiber yarn and woven or knitted fabric using the same - Google Patents

Description

  The present invention relates to a functional fiber yarn suitable for obtaining a woven or knitted fabric excellent in spinning operability and excellent in far-infrared radiation performance, heat generation performance and whiteness, and the woven and knitted fabric.

  Conventionally, many knitted and knitted fabrics for the purpose of keeping warm have been put on the market, and various techniques such as the use of dead air by hollow fibers, the use of moisture absorption heat generation effect, the method of converting sunlight into heat, etc. were used. Material has been proposed. However, the use of dead air is a passive method of suppressing heat dissipation by including air, so there is a limit to heat retention against the cold, and the use of an air layer makes the woven or knitted fabric bulky. There was a problem that. In addition, the use of the moisture absorption heat generation effect generates heat by absorbing moisture such as insensitive excretion, but when it absorbs moisture, it generates heat, but it has low sustainability and immediately releases heat. There was a problem. On the other hand, the method of converting sunlight into heat has a problem that although a sufficient effect is recognized outdoors in fine weather, the effect can hardly be expected in rainy weather or indoors.

  On the other hand, in recent years, a technique for imparting a heat retaining effect to fibers using far-infrared radioactive fine particles has been proposed. For example, Patent Document 1 discloses a fiber containing 3% by weight or more of far-infrared radioactive fine particles. In Patent Document 2, mica having an average particle size of 2.5 to 5.0 μm and mica having an average particle size of 8.0 to 13.0 μm are added to polyester in a ratio of 4/6 to 8/2 in a weight ratio of 3 in total. Far-infrared ray irradiating polyester containing ˜8% by weight is disclosed. Furthermore, Patent Document 3 discloses a sheath portion made of a polymer containing 1 to 10% by weight of far-infrared radioactive fine particles exhibiting a specific far-infrared irradiation rate, and a core portion made of a polymer containing 10 to 70% by weight of the fine particles. Disclosed is a far-infrared radioactive functional fiber. Further, Patent Document 4 discloses a functional fiber having a core-sheath structure including a thermoplastic polymer containing far-infrared radiation fine particles in a sheath portion, and the far-infrared radiation fine particles are 3% by weight of the whole fiber. A fiber is disclosed.

  However, as in Patent Documents 1 to 4, in order to increase the heat retention effect of the fiber using only the far-infrared radioactive fine particles, it is necessary to contain or attach a large amount of the far-infrared radioactive fine particles, and the yarn breaks during spinning. There is a problem that the wear of the guide and the guide are likely to occur and the spinning operability is deteriorated. In the technique of Patent Document 4, although the far-infrared radioactive fine particles are localized in the sheath portion of the core-sheath structure, the spinning operability is improved, but it is still not satisfactory.

  Furthermore, as in Patent Documents 1 to 4, with the technology that provides the heat insulation effect to the fiber using only the fine particles having far-infrared radiation characteristics, there is a limit to the heat insulation effect that can be realized, and sufficient warmth is realized. The current situation has not yet been reached.

  In addition, a woven or knitted fabric with excellent whiteness can be finished in white or light color, and can be given any color, which is effective in enhancing the fashionability of clothes. However, at present, no woven or knitted fabric that has excellent whiteness as well as far-infrared radiation performance and heat generation performance has been proposed.

JP-A 63-227828 Japanese Patent Laid-Open No. 9-77961 JP 63-152413 A Japanese Patent Laid-Open No. 2-154209

  The present invention provides a functional fiber yarn suitable for obtaining a woven or knitted fabric excellent in spinning operability and having excellent far-infrared radiation performance and heat generation performance as well as whiteness, and a woven or knitted fabric using the functional fiber yarn. This is a technical issue.

  The inventors of the present invention have arrived at the present invention as a result of studies to solve the above problems. That is, this invention makes the following a summary.

(1) White fine particles made of stannic oxide doped with antimony oxide or white fine particles made by coating tantalum oxide doped with antimony oxide on other inorganic fine particles, and a functional fiber containing mica Thread,
White fine particles composed of a functional fiber having a core-sheath structure, white fine particles made of stannic oxide doped with antimony oxide or other inorganic fine particles coated with stannic oxide doped with antimony oxide included in the core unit, characterized in that the mica is included in the core or the sheath, functionality fiber yarns.
( 2 ) White fine particles made of stannic oxide doped with antimony oxide or white fine particles made by coating stannic oxide doped with antimony oxide on other inorganic fine particles, and a functional fiber containing mica Thread,
White fine particles composed of a functional fiber having a core-sheath structure, white fine particles made of stannic oxide doped with antimony oxide or other inorganic fine particles coated with stannic oxide doped with antimony oxide included in the sheath portion, characterized in that the mica is included in the core or the sheath, functionality fiber yarns.
( 3 ) White fine particles made of stannic oxide doped with antimony oxide or white fine particles made of tantalum oxide doped with antimony oxide coated with other inorganic fine particles, and a functional fiber containing mica Thread,
White fine particles comprising functional fine fibers having a core-sheath structure, white fine particles made of stannic oxide doped with antimony oxide, or other inorganic fine particles coated with stannic oxide doped with antimony oxide, and Both mica are contained in the core, and the shape of the core is a multi-leaf type cross-sectional shape extending radially from the center of the fiber, and the number of leaves of the multi-leaf type cross-sectional shape is in the range of 6-20. characterized in that, functionality fiber yarns.
( 4 ) The functional fiber yarn according to any one of ( 1) to ( 3), wherein the core-sheath mass ratio (core / sheath) is in the range of 95/5 to 15/85.
( 5 ) A woven or knitted fabric comprising the functional fiber yarn according to any one of (1) to ( 4) .
( 6 ) The woven or knitted fabric according to ( 5 ), wherein the whiteness (white index) is 80 or more.

  According to the present invention, it is possible to provide a warmer woven or knitted fabric by further improving the far-infrared radiation performance by heat generation in addition to the heat retention by excellent far-infrared radiation performance and heat generation performance. Furthermore, the woven or knitted fabric can be finished in white or light color, and the appearance of the woven or knitted fabric is not impaired.

It is a schematic diagram which illustrates the preferable cross-sectional shape of the functional fiber in this invention. It is a schematic diagram which illustrates the preferable cross-sectional shape of the functional fiber in this invention. It is a schematic diagram which illustrates the preferable cross-sectional shape of the functional fiber in this invention.

  Hereinafter, the present invention will be described in detail.

The functional fiber constituting the functional fiber yarn of the present invention is composed of white fine particles made of stannic oxide doped with antimony oxide or other inorganic fine particles coated with stannic oxide doped with antimony oxide. It is important to contain white fine particles and mica . Since the white fine particles have the property of selectively absorbing sunlight and emitting heat rays, the synthetic fibers containing the fine particles and the yarns and fabrics containing the synthetic fibers also have the same properties. .

  Among the white fine particles, in the white fine particles made of stannic oxide doped with antimony oxide, the mass ratio of antimony oxide to stannic oxide is antimony oxide / stannic oxide = 0.5 / 99. .5 to 15.0 / 85.0 is preferred.

  On the other hand, other inorganic fine particles that can be employed in the white fine particles formed by coating stannic oxide doped with antimony oxide on other inorganic fine particles are not particularly limited, but are titanium oxide, oxidized Examples thereof include zinc, calcium oxide, calcium carbonate, zinc carbonate, calcium sulfate, barium sulfate, and aluminum oxide. The mass ratio is preferably antimony oxide / stannic oxide / other inorganic fine particles = 0.5 / 5.0 / 94.5 to 2.0 / 18.0 / 80.0.

  The average particle diameter of the white fine particles is not particularly limited, but is preferably 10 μm or less, more preferably 0.05 to 1.0 μm, and even more preferably 0.05 to 0.5 μm. When the particle size exceeds 10.0 μm, it is not preferable because clogging of the filter medium or yarn breakage tends to occur in the spinning process.

  The content of the white fine particles in the functional fiber is preferably 0.8 to 12.0% by mass, and more preferably 1.0 to 10.0% by mass. When the content is less than 0.8% by mass, the woven or knitted fabric does not sufficiently exhibit the function of absorbing sunlight and emitting heat rays as a whole. On the other hand, if it exceeds 12.0% by mass, the spinnability is deteriorated and the strength of the fiber is lowered. In the present invention, a mixture of white fine particles made of stannic oxide doped with antimony oxide and white fine particles made of tantalum oxide doped with antimony oxide coated with other inorganic fine particles is used. The above range is preferable as the content in this case.

Mica contained in the functional fiber in the present invention is preferable from the viewpoint of further improving the spinning operability and far infrared radiation performance.

The average particle diameter of mica is not particularly limited, but is preferably 10 μm or less, more preferably 0.1 to 5 μm, and still more preferably 0.3 to 3 μm. If the average particle diameter of mica is within the above range, a more excellent heat retention effect can be achieved without adversely affecting the spinning operability. Here, the average particle diameter is a volume average particle diameter measured using a laser diffraction scattering method particle size distribution measuring apparatus.

Although it does not restrict | limit especially as content of mica in the functional fiber in this invention, For example, 0.1-10 mass% is mentioned. In particular, the functional fiber according to the present invention has the advantage of having an excellent heat retaining effect because the white fine particles described above are used in combination even if the content of mica is low. That is, in the present invention, as described below, not only the heat white particles emitted available improved itself thermal effect, the heat can also be used to the temperature rise of the mica, in accordance with the temperature rise from mica more Since a lot of far-infrared rays are emitted, as a result, a better heat retention effect is achieved.

  The constituent polymer of the fiber composite in the present invention is not particularly limited as long as melt spinning is possible, and a polymer conventionally used as a raw material for fibers can be used. Examples of such polymers include polyesters such as polyethylene terephthalate (PET), polybutylene terephthalate, and polytrimethylene terephthalate; polyamides such as nylon 6, nylon 66, nylon 46, nylon 11, and nylon 12; polypropylene, polyethylene, and the like. Polyolefins; Polychlorinated polymers such as polyvinyl chloride and polyvinylidene chloride; Fluoropolymers such as polytetrafluoroethylene and polyvinylidene fluoride; Biomass-derived monomers such as PLA (polylactic acid) and PBS (polybutylene succinate) Biomass polymer obtained by polymerization of the polymer; a copolymer comprising two or more monomers constituting these polymers;

  These polymers may be copolymers containing other constituent monomers in view of viscosity, thermal characteristics, compatibility and the like. For example, when a polyester copolymer (copolyester) is used, aromatic dicarboxylic acids such as isophthalic acid and 5-sulfoisophthalic acid: adipic acid, succinic acid, suberic acid, sebacic acid, dodecanedioic acid Aliphatic dicarboxylic acids such as ethylene glycol, propylene glycol, 1,4-butanediol, 1,4-cyclohexanedimethanol, etc .; glycolic acid, hydroxybutyric acid, hydroxyvaleric acid, hydroxycaproic acid, hydroxypentanoic acid Hydroxycarboxylic acids such as hydroxyheptanoic acid and hydroxyoctanoic acid; copolymers of aliphatic lactones such as ε-caprolactone and polyesters may be used.

The functional fiber in the present invention thus contains specific white fine particles and mica . The functional fiber may contain inorganic fine particles such as a matting agent, a flame retardant, and an antioxidant, an organic compound, and the like as necessary. The functional fiber yarn of the present invention is a yarn composed of such functional fibers, and is usually constituted by bundling a plurality of functional fibers.

  In the present invention, the form of the functional fiber may be staple or filament. In particular, when used as a filament, it can be used in any form of monofilament or multifilament, but multifilament is generally preferred. In this case, it is preferable that the multifilament is composed only of the functional fiber, but the multifilament may be composed by mixing with other arbitrary fibers as long as the effects of the present invention are not impaired.

The functional fiber constituting the present invention thus contains white fine particles and mica in the filament. By having such a configuration, the far infrared radiation performance is limited to the far infrared functional agent. It has been found that it is remarkably improved as compared with the case of containing. In particular, it has been found that the amount of far-infrared radiation in a specific wavelength region, specifically 15 μm to 18 μm, increases, and the overall far-infrared radiation effect is improved. The reason for this is not clear, but white particulates not only convert sunlight that has been used in the past into heat, but also have the ability to radiate far-infrared rays in a specific wavelength region. Together with this, it is assumed that far infrared rays are emitted synergistically.

In the present invention, by containing such white particles, sunlight is converted into heat efficiently, it is possible to provide sufficient warmth, even if the hard to reach sunlight such as rainy weather or room, warm the mica Can be maintained. In addition, in the present invention, by including both white fine particles and mica in the same fiber, the heat generated by the white fine particles is not only used for imparting warmth, but also the temperature of the adjacent mica itself. It has a synergistic effect that further enhances the far-infrared radiation effect. In particular, when both white fine particles and mica are contained in the same constituent part of the fiber, that is, the core part or the sheath part, since both are closer to each other, the above-mentioned effect is efficiently achieved, and the content of the fine particles is reduced. Even if it reduces, sufficient heat retention effect is acquired, On the other hand, since spinning operation property is stabilized by reducing content of microparticles | fine-particles, it is further more preferable. In addition, when it is contained in the core part, it is preferable that mica is present as close to the fiber surface as possible, and the ratio of the core part in the core-sheath shape is increased, or the shape of the core part is an irregular cross section. This is a preferred embodiment.

  When the functional fiber in the present invention has a core / sheath structure, the core / sheath weight ratio (core / sheath) is preferably 95/5 to 15/85 and 85/15 to 40/60. When the core-sheath weight ratio satisfies the above range, a superior heat retaining effect can be achieved without adversely affecting the spinning operability.

Furthermore, when the functional fiber in the present invention has a core-sheath structure, white inorganic particles made of stannic oxide doped with antimony oxide or tantalum oxide doped with antimony oxide are coated with other inorganic fine particles The white fine particles and mica may be contained in either the core portion or the sheath portion. In this case, white particles made of stannic oxide doped with antimony oxide or white particles made of tantalum oxide doped with antimony oxide coated with other inorganic particles and mica are both contained in the core. Or both may be included in the sheath. In addition, white fine particles made of stannic oxide doped with antimony oxide or white fine particles made of tantalum oxide doped with antimony oxide coated on other inorganic fine particles are in the core, and mica is in the sheath. Each sheath may contain white-based fine particles made of stannic oxide doped with antimony oxide or white-based fine particles made of tantalum oxide doped with antimony oxide coated with other inorganic fine particles. In addition, mica may be included in the core. In general, when a large amount of a functional agent is contained near the fiber surface, the heat retention effect of the woven or knitted fabric tends to increase, but the guide wear resistance of the yarn tends to deteriorate. On the other hand, when the fiber inner layer contains a large amount of functional agent, the heat retention effect of the woven or knitted fabric tends to be somewhat difficult to improve, but the guide wear resistance of the yarn tends to improve. Therefore, when designing the fiber, it is preferable that the functional material is contained in the fiber after sufficiently considering the use and productivity of the woven or knitted fabric.

  When the functional fiber has a core-sheath structure, the specific structure is, for example, a concentric core-sheath shape as shown in FIGS. 1 and 2, or a core shape as illustrated in FIG. Examples include shapes. In addition, although not shown, a side-by-side shape can also be adopted.

As the multi-leaf type cross-sectional shape, a shape extending radially from substantially the center of the fiber is usually employed. Specifically, the radial type illustrated in FIGS. 3A and 3E, the separated fruit section type illustrated in FIGS. 3B and 3C, and the connected fruit section illustrated in FIG. 3D. A shape mold can be used. When white core particles made of stannic oxide doped with antimony oxide or white inorganic particles made by coating tantalum oxide doped with antimony oxide on other inorganic particles and mica are arranged in the core. Since the functional agent is not exposed on the fiber surface, rollers and guides of spinning machines, looms, knitting machines and the like are hardly damaged. In the present invention, white fine particles made of stannic oxide doped with antimony oxide or white fine particles made of stannic oxide doped with antimony oxide coated with other inorganic fine particles and mica are arranged in the core. In addition, as the cross-sectional shape of the core part, a multi-leaf type cross-sectional shape extending radially from substantially the center of the fiber may be employed, and the number of leaves in the multi-leaf type cross-sectional shape may be in the range of 6-20. By doing so, roller wear and guide wear during weaving and knitting can be effectively suppressed, and at the same time, a heat retaining effect can be efficiently imparted to the woven or knitted fabric. In the present invention, fibers having the shapes exemplified in FIGS. 3A and 3E are preferably employed. In the shape of the core in (a) and (e), the number of leaves is eight.

  Furthermore, when adopting a multi-leaf type cross-sectional shape as the cross-sectional shape of the fiber core portion, adjusting the distance from the tip of the leaf to the edge of the fiber can further improve the coexistence of the guide wear resistance and the heat retaining effect. Specifically, the ratio (DC) between the shortest distance from the leaf tip to the fiber edge and the fiber radius (DC), that is, DC = (the shortest distance from the leaf tip to the fiber edge) / fiber radius × 100 ( When the DC calculated in (%) is adjusted so that it is preferably 40% or less, more preferably 25% or less, a place that contributes to both of the effects becomes large. The DC can be adjusted by appropriately selecting a spinning nozzle.

Further, in the functional fiber, white fine particles made of stannic oxide doped with antimony oxide or white fine particles made of tantalum oxide doped with antimony oxide coated with other inorganic fine particles, and mica are both sheathed. In the case where it is contained in the part, white fine particles made of stannic oxide doped with antimony oxide with respect to 100% by mass of the sheath part or oxide oxide doped with antimony oxide from the viewpoint of achieving a further excellent heat retention effect . When white fine particles made of a coating of distin with other fine inorganic particles are contained in an amount of 0.1 to 2.5% by mass, preferably 0.5 to 2% by mass, more preferably 1.0 to 2% by mass. Good. On the other hand, 0.1 to 2.5% by mass, preferably 0.5 to 2% by mass, and more preferably 1.0 to 2% by mass of mica with respect to 100% by mass of the sheath portion. Furthermore, as the total content of white fine particles made of stannic oxide doped with antimony oxide or white fine particles made of tantalum oxide doped with antimony oxide coated with other inorganic fine particles, mica , From the viewpoint of achieving both improvement in spinning operability and expression of a heat retaining effect, the content is preferably 0.2% by mass or more and less than 3.0% by mass with respect to 100% by mass of the sheath part.

  When the functional fiber yarn of the present invention is in the form of a multifilament yarn, the single yarn fineness is, for example, 0.01 to 30 dtex, preferably 0.1 to 10 dtex, more preferably 0.1 to 3 dtex. The total (total) fineness is, for example, 1 to 500 dtex, preferably 5 to 300 dtex, and more preferably 10 to 200 dtex. By reducing the single yarn fineness, the fiber surface area is increased, and accordingly, the far-infrared radiation performance and the heat generation performance can be improved, and the heat retention effect can be further enhanced. Further, when the single yarn fineness is reduced or false twist is applied, the air layer is increased, and as a result, a heat retaining effect due to dead air can be further added.

The functional fiber yarn of the present invention can be obtained by spinning using a polymer, mica and white fine particles by a conventionally known method. As a method for spinning the functional fiber yarn of the present invention, specifically, a POY method in which a semi-undrawn yarn is obtained by high-speed spinning with a spinning speed of 2000 m / min or higher; a low speed of less than 2000 m / min or 2000 m / min once. Examples thereof include a method in which melt spinning is performed at the above high speed and the wound yarn is subjected to a drawing heat treatment; a direct spinning drawing method in which the drawing is continuously performed without winding. Moreover, when the functional fiber in this invention has a core-sheath structure, a core-sheath structure can be formed using a normal core-sheath-type composite melt spinning apparatus.

  Furthermore, the functional fiber yarn may be composed only of the fiber, or may be a mixed yarn of the functional fiber and another fiber. In the case of a mixed yarn, it is produced by a conventionally known method such as interlace processing or taslan processing. When the yarn of the present invention is a composite yarn, the content of the functional fiber is, for example, 10% by mass or more, preferably 30 to 90% by mass, and more preferably 50 to 90% by mass.

  Moreover, you may twist the thread | yarn of this invention as needed. The number of twists in this case is not particularly limited, and examples thereof include 10 to 3000 T / m, preferably 50 to 2000 T / m, and more preferably 100 to 1000 T / m. When twisting, a ring-type twisting machine or a double twister is generally used. Furthermore, the yarn of the present invention may be false twisted. The method of false twisting is not particularly limited, and can be performed by employing conventionally known conditions. When the yarn of the present invention is crimped by false twisting, the air layer is increased, so that a heat retaining effect due to dead air can be further added. Moreover, it is good also as a processed thread | yarn combining a false twist process and a mixed fiber process.

  The woven or knitted fabric of the present invention is formed using the yarn. The woven or knitted fabric of the present invention may be formed of the yarn alone, or may be formed of a combination of the yarn and another yarn within a range not impairing the effects of the present invention. Further, the fabric of the present invention may be any of woven fabric, knitted fabric, non-woven fabric and the like.

  When the present invention is a woven fabric, the cover factor (CF) is preferably in the range of 1000 to 3500, and particularly preferably 1500 to 2500. Moreover, when this invention is a knitted fabric, it is preferable that CF exists in the range of 500-2500, and it is especially preferable that it is 800-1800.

Here, the cover factor (CF) is calculated by the following formula (1) in the case of a woven fabric, and is calculated by the following formula (2) in the case of a knitted fabric.
CF = WAD × √DT + WED × √DT (1)
CF = CD × √DT + WD × √DT (2)
here,
DT: Fineness of yarn (dtex)
WAD: Warp density (main / 2.54cm)
WED: Weft density (main / 2.54cm)
CD: Course density (book / 2.54cm)
WD: Wale density (book / 2.54cm)

By setting the CF in the above range, the density of the fabric increases, so that heat retention can be increased without releasing heat from the human body, etc., and the distance between the functional fibers is close, so that white fine particles are generated. Since the heat is efficiently transferred without escaping the heat and the functional fibers are adjacent to each other, the heat from all directions is efficiently transmitted to the mica , so that the far-infrared radiation effect is further enhanced.

  In addition, it is preferable to use 20 to 100% by mass of the functional fiber yarn with respect to the entire fabric in order to sufficiently exhibit the heat retaining effect.

  Further, the woven or knitted fabric of the present invention may be subjected to treatments such as dyeing, coloring printing, embossing, water repellent, antibacterial, phosphorescent, and deodorizing according to a conventionally known method, if necessary. .

  Since the woven or knitted fabric of the present invention is composed of the functional fiber yarn, it is excellent in white color. Therefore, it is possible to finish white or light, and it is also possible to reproduce any color vividly by dyeing. Therefore, the woven or knitted fabric of the present invention is effective in enhancing the fashionability of clothes. The white color of the woven or knitted fabric can be evaluated by WI (white index). The woven or knitted fabric of the present invention can have a white finish of WI80 or higher. The whiteness of the woven or knitted fabric is measured with UV = 99.9% according to ASTM-E-313 method using a spectrophotometer CM-3700D manufactured by Minolta.

  The use of the woven or knitted fabric of the present invention is not particularly limited. It is suitably used as a raw material for textiles that require heat retention.

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

  Each measuring method and evaluation method are as follows.

(1) Intrinsic Viscosity The intrinsic viscosity was measured based on a conventional method under the condition of a temperature of 20 ° C. using a mixture of equal mass of phenol and ethane tetrachloride as a solvent.

(2) DC
After taking out the functional fiber (single yarn) from the functional fiber yarn, the cross section of the single yarn was photographed using an optical microscope ("PCSCOPE PCS-81X (trade name)" manufactured by Inabata Sangyo Co., Ltd.), DC was calculated based on the following formula.
DC = (shortest distance from leaf tip to fiber edge) / fiber radius × 100 (%)
However, when the fiber has a core-sheath structure and the cross-sectional shape of the core part is a multi-leaf type cross-sectional shape, the shortest distance from each tip to the fiber outer periphery is measured for each leaf, and the average of them is , “The shortest distance from the tip of the leaf to the edge of the fiber”. Further, a line was drawn from the center of the fiber to the outer periphery of the single yarn so as to pass through the tip of each leaf, and an average of them was defined as “fiber radius”.

(3) Far-infrared radiation The far-infrared radiation intensity of the knitted fabric obtained in each of the examples and comparative examples was measured. The measurement was performed using an infrared spectrophotometer FT-IR apparatus at a measurement temperature of 40 ° C. and a measurement wavelength range of 5 to 20 μm. At that time, the far-infrared radiant intensity of the black body under the same conditions is also measured, and the ratio (%) of the radiant intensity of each knitted fabric when the radiant intensity of the black body at each wavelength is defined as 100% is calculated at each wavelength. The average value of the ratio was calculated as the average emissivity (%). Moreover, as a blank, except not containing the functional agents A and B, using the knitted fabric (comparative example 2) prepared using the fiber of the same composition as each Example and a comparative example, average emissivity (%) similarly Asked. And far-infrared radiation was computed based on following Formula.
<Calculation formula of far-infrared radiation>
Far-infrared radiation = [(average emissivity of the obtained knitted fabric (%) − average emissivity of blank (%)) / average emissivity of blank (%)] × 100

(4) Heat generation characteristics The surface of the knitted fabric obtained in each example and comparative example was irradiated with light from a reflex lamp so that the illuminance was 10,000 LUX, and the surface temperature of the knitted fabric was observed from the back surface by thermography.

(5) Guide wear property About the functional fiber yarn obtained in each Example and Comparative Example, after rewinding 100000 m with a rewind machine having a stainless steel traveler, the surface state of the traveler was observed with a microscope, and in accordance with the following criteria. The guide wear was evaluated.
<Guidelines for guide wear resistance>
(Double-circle): Abrasion is not recognized at all.
○: Slight wear but no problem.
Δ: Slightly worn.
X: Strong wear is recognized.

Example 1
Polyethylene terephthalate having an intrinsic viscosity of 0.65 was prepared as a fiber core material. On the other hand, as the sheath material, polyethylene terephthalate having an intrinsic viscosity of 0.65, mica having an average particle diameter of 1.5 μm, 1.0% by mass of the entire sheath material, and antimony oxide-doped stannic oxide as white fine particles What contained 1.0 mass% of the whole sheath material was prepared. Then, the core material and the sheath material were put into a composite spinning machine and spun at a spinning speed of 3500 m / min and a core-sheath ratio of 80:20 to obtain a functional fiber yarn of 56 dtex 24f. The obtained functional fiber had a cross-sectional shape shown in FIG. Using the obtained functional fiber yarn as a supply yarn, a smooth fabric was produced using a 32-gauge circular knitting machine. This fabric was scoured at 80 ° C. for 20 minutes, and then hydrothermally treated at 130 ° C. for 30 minutes to obtain a knitted fabric of the present invention.

(Example 2)
A functional fiber yarn and a knitted fabric were obtained in the same manner as in Example 1 except that the content of antimony oxide-doped stannic oxide was changed to 9.0% by mass.

(Comparative Example 1)
A functional fiber yarn and a knitted fabric were obtained in the same manner as in Example 1 except that white fine particles were not used.

(Comparative Example 2)
A functional fiber yarn and a knitted fabric were obtained in the same manner as in Example 1 except that spinning was performed only with polyethylene terephthalate having an intrinsic viscosity of 0.65.

(Example 3)
As the fiber core material, polyethylene terephthalate having an intrinsic viscosity of 0.65, mica having an average particle diameter of 1.5 μm, 1.0 mass% of the entire core material, and antimony oxide-doped stannic oxide as white fine particles What contained 9.0 mass% of the whole core material was prepared. On the other hand, polyethylene terephthalate having an intrinsic viscosity of 0.65 was prepared as a sheath material. Then, the core material and the sheath material are put into a composite spinning machine, and a nozzle capable of obtaining a radial mold as the core cross-sectional shape is used, and spinning is performed at a spinning speed of 3500 m / min and a core-sheath ratio of 20:80. A functional fiber yarn was obtained. The obtained functional fiber had a cross-sectional shape shown in FIG. Thereafter, the obtained functional fiber yarn was used as a supply yarn in the same manner as in Example 1 to obtain a knitted fabric.

(Examples 4 and 5)
A functional fiber yarn and a knitted fabric were obtained in the same manner as in Example 3 except that the value of DC was changed to that shown in Table 1.

(Example 6)
By using a nozzle capable of obtaining a separated-type fruit section-shaped mold as the cross-sectional shape of the core part, it is performed in the same manner as in Example 3 except that the fiber has the shape shown in FIG. Knitted fabric was obtained.

  From the above results, the knitted fabric containing the functional fiber yarn of the present invention was able to achieve both the heat generation and far-infrared emission at the same time, and was excellent in the heat retaining effect.

Furthermore, although the functional fiber yarn in each Example did not recognize the problem in general in guide abrasion property, it consists of stannic oxide doped with antimony oxide like the functional fiber yarn in Examples 1 and 2. Yarns composed of white fine particles or white fine particles made by coating stannic oxide doped with antimony oxide on other inorganic fine particles, fibers made of mica arranged in the sheath part, have a functional agent arranged in the core part. Compared with the yarn (Examples 3 to 6) composed of the above, the result was slightly inferior in terms of guide wear. Further, the knitted fabric of the comparative example could not realize both far infrared radiation and heat generation characteristics at the same time.

In the knitted fabric of the present invention, it was also verified to what extent the far-infrared radiation effect was improved by utilizing the heat generated by the white fine particles to increase the temperature of mica . Specifically, when the knitted fabric of Example 3 was used as a test piece and measurement was performed with “(3) far infrared radiation”, the measurement temperature was changed to 40 ° C. and the temperature difference from the blank (Comparative Example 2). A certain 3.8 degreeC was added and it was set as 43.8 degreeC.

As a result, the far-infrared radiation was 12.5 for the knitted fabric of Example 3. That is, according to the woven or knitted fabric of the present invention, not only the heat white particles emitted available improved itself thermal effect, the heat can also be used to the temperature rise of the mica, in accordance with the temperature rise from mica more It was shown that many far infrared rays are emitted.

In addition, since the knitted fabrics of the examples were all white, even if they were dyed in white or lightly, they did not affect the appearance.

Claims (6)

White fine particles made of stannic oxide doped with antimony oxide or white fine particles made of tantalum oxide doped with antimony oxide coated with other inorganic fine particles, and a functional fiber yarn containing mica. And
White fine particles composed of a functional fiber having a core-sheath structure, white fine particles made of stannic oxide doped with antimony oxide or other inorganic fine particles coated with stannic oxide doped with antimony oxide included in the core unit, characterized in that the mica is included in the core or the sheath, functionality fiber yarns. White fine particles made of stannic oxide doped with antimony oxide or white fine particles made of tantalum oxide doped with antimony oxide coated with other inorganic fine particles, and a functional fiber yarn containing mica. And
White fine particles composed of a functional fiber having a core-sheath structure, white fine particles made of stannic oxide doped with antimony oxide or other inorganic fine particles coated with stannic oxide doped with antimony oxide included in the sheath portion, characterized in that the mica is included in the core or the sheath, functionality fiber yarns. White fine particles made of stannic oxide doped with antimony oxide or white fine particles made of tantalum oxide doped with antimony oxide coated with other inorganic fine particles, and a functional fiber yarn containing mica. And
White fine particles comprising functional fine fibers having a core-sheath structure, white fine particles made of stannic oxide doped with antimony oxide, or other inorganic fine particles coated with stannic oxide doped with antimony oxide, and Both mica are contained in the core, and the shape of the core is a multi-leaf type cross-sectional shape extending radially from the center of the fiber, and the number of leaves of the multi-leaf type cross-sectional shape is in the range of 6-20. characterized in that, functionality fiber yarns. The functional fiber yarn according to any one of claims 1 to 3, wherein a core-sheath mass ratio (core / sheath) is in a range of 95/5 to 15/85. A woven or knitted fabric comprising the functional fiber yarn according to any one of claims 1 to 4 . The woven or knitted fabric according to claim 5 , wherein the whiteness (white index) is 80 or more.