JP2006283242A - Near infrared rays-shielding fiber, and curtain and outerwear including the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a curtain that can have satisfactory lighting and can shield radiant heat and an outerwear that has strong glossy feeling but can shield the radiant heat. <P>SOLUTION: The near infrared rays-shielding fiber has a layer made of a fiber-forming resin in which fine particles of lanthanum hexaboride are dispersed. The curtain and outerwear is composed of this fiber. The curtain and outerwear made of this fiber can suppress the temperature rise in the room by shielding near infrared rays and the room is made bright in the curtain by the transmission of visible light, while the outerwear having high glossy feeling can be obtained in the clothes. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a fiber that shields near infrared rays, and a curtain and outerwear using the same.

  Conventionally, fibers used for curtains and outerwear for light shielding have been achieved by a method of dispersing white pigments such as titanium oxide, talc, and barium sulfate, carbon black, and aluminum powder in the fibers. (For example, Patent Document 1 and Patent Document 2)

  In these methods, not only the visible light range but also from the ultraviolet region to the infrared region is shielded. For example, when used for curtains, the interior of a room becomes dim or when carbon black is used. There was a problem that the color was limited to black or had a smooth color with no gloss.

  On the other hand, as a material for blocking only the near infrared region and transmitting the visible region, a method of dispersing a pigment such as 9,10-anthracendion or 9,10-anthraquinone is proposed as a film material. Although there is a product (Patent Document 3), the effect is not sufficient, and blue-colored coloring cannot be avoided. Furthermore, although it is for OA equipment, a heat insulating resin containing copper ions (Patent Document 5) as a member (Patent Document 4) or an optical filter that adds a pigment having a near-infrared absorption capability to give heat insulating properties. ) Was only proposed.

Japanese Patent Laid-Open No. 11-81048 JP-A-9-137345 JP 2003-251728 A JP-A-9-330612 JP-A-6-118228

  An object of the present invention is to provide a curtain that blocks radiant heat while obtaining sufficient lighting, and outerwear having a strong gloss while blocking radiant heat.

  This object can be achieved by using near-infrared light-shielding fibers having a layer made of a fiber-forming resin in which fine particulate lanthanum hexaboride is dispersed in this curtain or outerwear.

  Curtains and outerwear using the fibers obtained by the present invention can transmit visible light while blocking the near-infrared ray to suppress the temperature rise inside, so that the interior of the curtain is bright and the glossiness of clothing High outerwear can be obtained.

  As a result of intensive studies to solve the above problems, the present inventor has found a near-infrared light-shielding fiber having a layer made of a fiber-forming resin in which fine-grained lanthanum hexaboride is dispersed. It has been found that the problem can be solved by using it for wear.

  Moreover, it discovered that a function was expressed very efficiently that content of particulate lanthanum hexaboride is 0.01-20 g / kg.

  The object of light shielding is near infrared rays, which is the heat energy of sunlight. It is said that the sunlight that reaches the surface of the earth is generally in the wavelength range of about 290-2100 nm. Of these, the wavelength range of about 380 to 780 nm is the visible wavelength range, and is necessary for maintaining brightness. Therefore, it is preferable to select a material that selectively and efficiently shields or absorbs near-infrared light of about 780 to 2100 nm in solar heat insulation.

  The transmission spectrum of the lanthanum hexaboride fine particle dispersed film has a large light transmittance in the visible light region, and has a transmission peak in the vicinity of a wavelength of 550 nm. Since this transmission peak coincides with the wavelength having the highest sensitivity of the human eye, it is advantageous for maintaining the transmission of visible light. Furthermore, since there is a large absorption in the vicinity of a wavelength of 1000 nm, it is possible to efficiently absorb or shield near-infrared light and efficiently block the thermal energy of sunlight.

  As described above, the near-infrared light shielding fiber of the present invention using lanthanum hexaboride fine particles as a filler has a heat insulating property by efficiently shielding the near-infrared region of sunlight, and at the same time, a visible light region centering around a wavelength of about 550 nm. For example, when it is used for a curtain, indoor lighting can be sufficiently secured.

  As lanthanum hexaboride, a commercially available chemical reagent can be used.

  As a method for making lanthanum hexaboride into fine particles, there are methods such as a jet mill, a ball mill, a sand mill, and an ultrasonic pulverizer, and these methods can be combined for treatment. Moreover, you may process by a dry process or a wet process.

  The particle diameter of lanthanum hexaboride is preferably less than 2 μm from the viewpoint of fiber strength. If the particle diameter is larger than that, there is a possibility that the fiber strength is deteriorated. More preferred is a particle size of 1 μm or less, generally referred to as nano-size.

  Moreover, there is no problem even if the particulate lanthanum hexaboride such as KHF-7A manufactured by Sumitomo Metal Mining is used as it is.

  For the compounding of lanthanum hexaboride and fiber moldable resin, a specially specified method is not used, but compounding is performed using a conventional twin-screw kneading extruder, etc. Can be obtained.

  The cross-sectional form of the near-infrared light shielding fiber may be a structure in which lanthanum hexaboride is dispersed throughout the fiber, or the layer in which the lanthanum hexaboride is dispersed may be any of the cross-sectional shapes such as a core sheath, a sandwich, and an eccentricity. It doesn't matter if it's in that layer.

The fiber-forming resin is not particularly limited, but it is preferable to use nylon resin, polyester resin, and polypropylene in view of availability, fiberization, and cost. Specifically, if nylon resin, 6 nylon, 11 nylon,
Examples include 12 nylon and 66 nylon. For polyester resins, polyethylene terephthalate, polytrimethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polycyclohexane terephthalate, and their copolymers and acid components (terephthalic acid) are partially replaced with isophthalic acid. Is mentioned. Furthermore, aliphatic polyesters such as polylactic acid and polyglycolic acid can also be used.

  The method for producing the near-infrared light-shielding fiber is the same for both single fibers in which lanthanum hexaboride is dispersed as a whole and composite fibers composed of a layer in which lanthanum hexaboride is dispersed and a layer in which lanthanum hexaboride is not dispersed. Can be used. Specifically, a method (conventional method) is adopted in which a resin heated and melted to a melting point or higher by an extruder is turned into a fiber through a nozzle to obtain an undrawn yarn, which is further drawn into a fiber. I can do it. In addition, there is no problem even in the method of continuously drawing the yarn coming out of the nozzle as it is to obtain fibers (spinning direct drawing method).

  Curtains in the present invention generally refer to things such as roll screen types and pleated screens, which are suspended from a window, and are made using fabric obtained by weaving and knitting fibers. is there.

  The outerwear referred to in the present invention includes a windbreaker, jacket, pants, hat, and gloves.

EXAMPLES Hereinafter, although an Example is given and this invention is demonstrated, this invention is not limited to this Example.
The preparation of various samples and the evaluation of the samples were performed by the following method.

(Production method of composite resin)
A biaxial kneading extruder TEX-30α made by Nippon Steel Co., Ltd. was used as the base resin, and a predetermined amount of lanthanum hexaboride was melt-kneaded at the melting point of the base resin + 20 ° C. to obtain a composite resin.

(Near-infrared light shielding fiber manufacturing method)
An undrawn yarn was obtained using a compound spinning machine at a head temperature of 280 ° C. and a winding speed of 700 m / min. The obtained undrawn yarn was drawn by a conventional method at a draw ratio of 3 to obtain a near-infrared light shielding fiber.

(Method for producing fabric)
A cylindrical knitted fabric was produced using MODEL: CR-B manufactured by Koike Machinery Co., Ltd.

(Light shielding evaluation method)
The cloth obtained by tubular knitting was placed on a black panel with a thermometer, irradiated with a Toshiba reflex lamp (AL-PRF-150W) from a location 30 cm above, and the black panel temperature at that time was measured. .

(Translucency evaluation method)
The haze value defined by JIS K 7105 was measured. The lower the haze value, the higher the transparency.

[Example 1]
Kanebo synthetic fiber nylon resin MC120 was melt-kneaded by the above-mentioned method so that lanthanum hexaboride KHF-7A manufactured by Sumitomo Metal Mining would be 1.7 wt% to obtain composite resin PALB. Using the obtained resin, a single yarn LB-1 having a round cross section of 50 dtex / 48 filament was obtained.
The obtained single yarn LB-1 was knitted in a cylinder to obtain a fabric LB-1.

  Using Kanebo Synthetic Fuldal Nylon Resin FD (titanium oxide 1.7 wt%), a 50 dtex / 48 filament round cross-section single yarn PAFD was obtained and similarly knitted to obtain a fabric PAFD. For the fabric LB-1 and the fabric PAFD, a light-shielding property evaluation and a light-transmitting property evaluation were carried out. When the light shielding property is high, ○, when the light shielding property is low, and when the light shielding property is equivalent, the evaluation is Δ. . Similarly, when the translucency is the same, the evaluation is evaluated as “◯” when the translucency is high, “X” when the translucency is low, and “Δ” when the translucency is equivalent.

[Comparative Example 1]
Kanebo synthetic nylon resin MC120 was used to obtain a 50 dtex / 48 filament round section single yarn PABR. The obtained single yarn PABR was knitted in a cylinder to obtain a fabric PABR. Using the obtained fabric PABR and the fabric PAFD obtained in Example 1, light-shielding evaluation and light-transmitting evaluation were performed, and evaluation was performed in the same manner.

[Example 2]
Kanebo Synthetic Polyester Resin HB was melt-kneaded by the above-mentioned method so that the lanthanum hexaboride KHF-7A manufactured by Sumitomo Metal Mining was 0.4 wt% to obtain a composite resin HBLB. A single yarn LB-2 having a round cross section of 50 dtex / 48 filament was obtained using the obtained resin. The obtained single yarn LB-2 was knitted into a tube to obtain a fabric LB-2.
Kanebo synthetic fiber polyester resin SD (titanium oxide 0.4 wt%) was used to obtain a single yarn PESD having a round cross section of 50 dtex / 48 filament, and knitted in the same manner to obtain a fabric PESD. The light-shielding evaluation and the light-transmitting evaluation were performed in the same manner as in the examples, and the evaluation was performed in the same manner.

[Comparative Example 2]
Kanebo synthetic polyester resin HB was used to obtain a single yarn PEBR having a round cross section of 50 dtex / 48 filament. The obtained single yarn PEBR was knitted in a cylinder to obtain a fabric PEBR. Using the obtained fabric PEBR and the fabric PESD obtained in Example 2, a light shielding evaluation and a light transmitting evaluation were performed, and the evaluation was similarly performed.

[Example 3]
Using the conjugate fiber LB-1 produced in Example 1, a curtain was produced by lace knitting. The produced curtain was hung by the window and exposed to sunlight from the inside of the window, but no strong heat rays were felt while sufficient light was obtained.

[Comparative Example 3]
Using the fiber PABR produced in Comparative Example 1, a curtain was produced by lace knitting. The curtain we made was hung by the window. When we were exposed to sunlight from the inside of the window, we could get enough light and felt strong heat rays.

[Example 4]
The composite fiber LB-1 obtained in Example 2 was taffeta-knitted, and a windbreaker was produced from this, and it was worn and exposed to sunlight, but no strong heat rays were felt.

[Comparative Example 4]
The fiber PEBR obtained in Comparative Example 2 was taffeta-knitted, and a windbreaker was produced from this, and when it was worn and exposed to sunlight, strong heat rays were felt.

The near-infrared light-shielding fiber according to the present invention transmits visible light but has a property of shielding near-infrared light, whereby a curtain or outerwear having a heat shielding effect can be obtained.

Claims (4)

  A fiber having a layer made of a fiber-forming resin in which fine lanthanum hexaboride is dispersed, wherein the fiber-forming resin is at least one selected from a polyester resin, a nylon resin, and a polypropylene resin. Near-infrared light shielding fiber.   The near-infrared light-shielding fiber according to claim 1, wherein the content of the particulate lanthanum hexaboride is 0.01 to 20 g / kg.   A curtain comprising 30% or more of the near-infrared light shielding fiber according to claim 1 or 2. An outerwear comprising 30% or more of the near-infrared light shielding fiber according to claim 1 or 2.