JP2012012726A - Heat-shielding woven or knitted fabric and clothing - Google Patents

Abstract

A heat-insulating woven or knitted fabric and apparel having not only excellent heat-insulating properties but also excellent lightness.
SOLUTION: After obtaining a woven or knitted fabric using a polyester multifilament containing a matting agent of 1.0% by weight or more and having a single fiber fineness of 1.5 dtex or less, it is made into a garment as necessary.
[Selection] Figure 1

Description

  The present invention relates to a heat-insulating woven or knitted fabric and apparel having not only excellent heat-insulating properties but also excellent lightness.

Conventionally, fiber products such as parasols, curtains, and sunshade sheets have been used to shield sunlight in the hot weather in summer. As such woven or knitted fabrics for textile products, those using fibers containing a matting agent such as titanium oxide, or those having a metal film formed on the surface of the woven or knitted fabric have been proposed (for example, Patent Documents). 1, see Patent Document 2).
However, those using fibers containing a matting agent have not been sufficient in terms of heat shielding properties. On the other hand, in the case where a metal film is formed on the surface of the woven or knitted fabric, there is a problem that the weight of the woven or knitted fabric becomes large and cannot be used for clothing.

JP-A-5-117935 JP 2007-1079 A

  This invention is made | formed in view of said background, The objective is to provide the heat insulation woven / knitted fabric and clothing which have not only the outstanding heat insulation but also the outstanding lightness.

  As a result of intensive studies to achieve the above-mentioned problems, the present inventors have surprisingly improved heat shielding properties when a woven or knitted fabric is obtained using a polyester multifilament containing a matting agent and having a small single fiber fineness. In addition, it has been found that such a woven or knitted fabric is excellent in light weight because it is not necessary to form a metal film, and the present invention has been completed by intensive studies.

  Thus, according to the present invention, there is provided “a heat-shielding woven or knitted fabric characterized by comprising a polyester multifilament containing a matting agent of 1.0% by weight or more and having a single fiber fineness of 1.5 dtex or less.”

In that case, in the said polyester multifilament, it is preferable that the total fineness exists in the range of 25-55 dtex. Moreover, in the said polyester multifilament, it is preferable that the cross-sectional shape of a single fiber is a flat cross section of the cross-sectional flatness 2-6 which has a 2 or more constriction part. The woven or knitted fabric is preferably a woven fabric having a cover factor CF defined by the following formula of 1200 or more.
CF = (DWp / 1.1) ^1/2 × MWp + (DWf / 1.1) ^1/2 × MWf
[DWp is the total warp fineness (dtex), MWp is the warp weave density (main / 2.54 cm), DWf
Is the total weft fineness (dtex), and MWf is the weft weave density (main / 2.54 cm). ]

In the heat-shielding woven or knitted fabric of the present invention, the basis weight of the woven or knitted fabric is preferably 120 g / m ² or less. Moreover, it is preferable that the knitted or knitted fabric is subjected to a calendar process and / or a water repellent process. Moreover, it is preferable that the average infrared reflectance of wavelength 700-1400nm is 48% or more. Moreover, according to this invention, the clothing which uses the said heat-shielding woven / knitted fabric is provided.

  According to the present invention, a heat-insulating woven or knitted fabric and apparel having not only excellent heat-insulating properties but also excellent lightweight properties can be obtained.

In the polyester fiber of this invention, the flat cross-sectional shape which has a constriction part which can be employ | adopted as cross-sectional shape of a single fiber is illustrated typically.

Hereinafter, embodiments of the present invention will be described in detail.
First, in the polyester multifilament used in the present invention, it is important that the single fiber fineness is 1.5 dtex or less (preferably 0.000001 to 1.5 dtex). When the single fiber fineness is larger than 1.5 dtex, there is a possibility that the inter-fiber gap becomes large and the heat shielding property may be lowered, and the lightness may be impaired. In this case, the polyester multifilament may be a super-fine fiber having a single fiber diameter of 1000 nm or less called nanofiber.

  In the polyester multifilament, in order to obtain an excellent heat shielding effect, the larger the number of filaments, the better. The number is preferably 30 or more (more preferably 30 to 10,000).

  Moreover, in the said polyester multifilament, it is preferable that it is in the range of 25-55 dtex as a total fineness (product of a single fiber fineness and the number of filaments). If the total fineness is less than 25 dtex, the heat shielding property may be impaired. Conversely, if the total fineness is greater than 55 dtex, the lightness may be impaired.

  In the polyester multifilament, the fiber form is not particularly limited, and may be a long fiber (multifilament yarn) or a short fiber. Among them, in order to obtain an excellent heat-shielding effect by reducing the inter-structure gap of the woven or knitted fabric, it is more bulky like a long fiber (multifilament yarn) than a fiber aggregated like a spun yarn. preferable. The cross-sectional shape of the single fiber is not particularly limited, and may be a known cross-sectional shape such as a circle, a triangle, a flat shape, or a hollow shape. Among them, when a flat cross section having a cross-sectional flatness of 2 to 6 having two or more constricted portions as schematically shown in FIG. 1 is adopted, the inter-tissue gap in the case of a woven or knitted fabric can be reduced, The heat shielding property is improved, which is preferable. The cross-sectional flatness is the ratio (B / C1) between the length (B) of the long side and the length (C1) of the short side shown in FIG. Further, the constricted portion is a portion where the length of the short side is shortened as schematically shown in FIG. In such a constricted portion, the depth of the concave portion is a depth that is 1.05 or more (preferably 1.1 to 2.0) in a ratio (C1 / C2) between the maximum value and the minimum value of the short side length. It is preferable. FIG. 1 illustrates the case where there are three constricted portions. In addition, normal air processing and false twist crimping may be applied.

  Preferable examples of the polyester-based polymer forming the polyester multifilament include polyethylene terephthalate, polytrimethylene terephthalate, polybutylene terephthalate, polylactic acid, stereocomplex polylactic acid, and polyester obtained by copolymerizing a third component. . Examples of such polyester include material-recycled or chemical-recycled polyester, and polyethylene terephthalate using a monomer component obtained by using biomass, that is, a biological material as a raw material, described in JP-A-2009-091694. May be. Furthermore, the polyester obtained using the catalyst containing the specific phosphorus compound and titanium compound which are described in Unexamined-Japanese-Patent No. 2004-270097 and 2004-21268 may be sufficient. It is important that the polyester polymer contains a matting agent (titanium dioxide) in an amount of 1.0% by weight or more (more preferably 1.0 to 5.0% by weight) relative to the weight of the polyester polymer. When the content of the matting agent is less than 1.0% by weight, there is a possibility that sufficient heat shielding properties may not be obtained, which is not preferable. In addition, a fine pore-forming agent, a cationic dye dyeing agent, a coloring inhibitor, a heat stabilizer, a fluorescent brightening agent, a coloring agent, a hygroscopic agent, and inorganic fine particles are included as long as the purpose of the present invention is not impaired. 1 type or 2 or more types may be contained.

  The heat-insulating woven or knitted fabric of the present invention is a woven or knitted fabric containing the polyester multifilament. At that time, the content of the polyester multifilament is preferably 20% by weight or more based on the total weight of the woven or knitted fabric in order to obtain excellent heat shielding properties.

In the heat-shielding woven or knitted fabric of the present invention, the woven or knitted fabric structure of the woven or knitted fabric is not particularly limited.For example, the woven structure may be a three-layer structure such as a plain weave, a twill pattern, a satin weave, a changed structure, a changed twill pattern, or the like. Examples thereof include a change structure, a single double structure such as warp double weave and weft double weave, and a vertical velvet. The number of layers may be a single layer or a multilayer of two or more layers. In the case of a knitted fabric, a weft knitted fabric or a newly knitted fabric may be used. Preferred examples of the weft knitting structure include flat knitting, rubber knitting, double-sided knitting, pearl knitting, tuck knitting, float knitting, one-sided knitting, lace knitting, bristle knitting, and the like. Single atlas knitting, double cord knitting, half tricot knitting, back hair knitting, jacquard knitting and the like are exemplified. The number of layers may be a single layer or a multilayer of two or more layers. The knitting / weaving method may be a normal method using a normal knitting / knitting machine (for example, a normal water jet loom, an air jet loom, a circular knitting machine, etc.).
As the basis weight is preferably excellent heat insulation and 120 g / ^{m 2} or less in terms of achieving both light weight (more preferably 30~80g / ^{m 2).}
In addition, it is preferable that the woven or knitted fabric is a woven fabric having a cover factor CF defined by the following formula of 1200 or more (more preferably 1400 to 5000) because a particularly excellent heat shielding effect is obtained.
CF = (DWp / 1.1) ^1/2 × MWp + (DWf / 1.1) ^1/2 × MWf
[DWp is the total warp fineness (dtex), MWp is the warp weave density (main / 2.54 cm), DWf
Is the total weft fineness (dtex), and MWf is the weft weave density (main / 2.54 cm). ]

  The woven or knitted fabric of the present invention can be produced, for example, by the following production method. That is, a chip in which a matting agent is blended in an amount of 1.0% by weight or more based on the polyester weight with the polyester having an intrinsic viscosity of 0.55 to 0.80 is spun by a conventional method, and a speed of 2000 to 4300 m / min The polyester multifilament is obtained by winding it once as an undrawn yarn (intermediate oriented yarn) and drawing it, or drawing it before winding. In addition, the intermediate oriented yarn is heat-treated in a relaxed state (overfeed 1.5 to 10%) using a heater heated to 180 to 200 ° C., so that an undrawn yarn having self-extensibility under heating ( Intermediately oriented yarn). Furthermore, false twist crimping, air processing, twisting, or the like may be performed.

  Subsequently, the heat-insulating woven or knitted fabric of the present invention can be produced by knitting or knitting a woven or knitted fabric using the polyester multifilament with a normal loom or knitting machine.

  Here, it is preferable to apply a calendering process and / or a water repellent process to the knitted or knitted fabric, since the inter-tissue gap becomes small, and the heat shielding property is further improved. As the water repellent treatment, for example, methods described in Japanese Patent No. 3133227 and Japanese Patent Publication No. 4-5786 are suitable. That is, a commercially available fluorine-based water repellent (for example, Asahi Guard LS-317, manufactured by Asahi Glass Co., Ltd.) is used as the water repellent, and the concentration of the water repellent is adjusted by mixing melamine resin and catalyst as necessary. In this method, the surface of the woven or knitted fabric is treated with the processing agent at a pickup rate of about 50 to 90% with a processing agent of about 3 to 15% by weight. Examples of the method for treating the surface of the woven or knitted fabric with the processing agent include a pad method and a spray method. Among them, the pad method is most preferable for allowing the processing agent to penetrate into the woven or knitted fabric. In addition, the said pick-up rate is a weight ratio (%) with respect to the woven / knitted fabric (before processing agent provision) weight of a processing agent. The calendering conditions are preferably a temperature of 130 ° C. or higher (more preferably 140 to 195 ° C.) and a linear pressure of 200 to 20000 N / cm.

In the heat-shielding woven or knitted fabric of the present invention, it further has functions such as conventional raising processing, ultraviolet shielding or antistatic agent, antibacterial agent, deodorant agent, insect repellent agent, phosphorescent agent, retroreflective agent, negative ion generator and the like. Various processing to be applied, buffing processing, or brush processing may be additionally applied.
The woven or knitted fabric thus obtained has excellent heat shielding properties. The reason is that near-infrared rays are reflected by the matting agent contained in the polyester multifilament, and at the same time, the monofilament fineness of the polyester multifilament is small, so the inter-tissue space of the woven or knitted fabric is small and the near-infrared ray is difficult to transmit. It is estimated that it will be. In addition, the woven or knitted fabric is excellent in light weight because the single fiber fineness of the polyester multifilament is small, and has both the properties that are usually contradictory to each other, namely heat shielding and light weight.

Here, the average infrared reflectance of the woven or knitted fabric is preferably “UV3100S MPC-3100” manufactured by Shimadzu Corporation, and the average infrared reflectance at a wavelength of 700 to 1400 nm is preferably 48% or more. Moreover, as heat insulation, it is preferable that it is 53 degrees C or less as measured by the following method. That is, the sample is held on 5 mm of the black drawing paper, and the temperature at the center of the drawing paper on the back surface is measured with a thermocouple by irradiating lamp light from the sample side.
Use lamp: Iwasaki Electric Co., Ltd. eye lamp <spot> PRS100V500W
Irradiation distance: 50cm
Irradiation time: 15 minutes Test chamber temperature: 18-22 ° C

  Next, the garment of the present invention is a garment using the woven or knitted fabric. Since this garment uses the woven or knitted fabric, it has excellent heat shielding properties and excellent lightness. Such clothing includes sportswear, outdoor clothing, men's clothing, women's clothing, work clothing, general clothing, and the like. The woven or knitted fabric may be used as a textile product such as curtains, tents, tarps, umbrellas, hats, awning sheets, and awning nets.

Next, although the Example and comparative example of this invention are explained in full detail, this invention is not limited by these. In addition, each measurement item in an Example was measured with the following method.
(1) Fabric weight of knitted or knitted fabric Measured according to JIS L1096 6.4.2.
(2) Reflectivity of near infrared rays The average reflectance with respect to the near infrared rays in the wavelength range of 700 to 1400 nm was measured with “UV3100S MPC-3100” manufactured by Shimadzu Corporation. A reflectance of 48% or more is considered good.

(3) Fabric cover factor CF
The cover factor CF of the fabric was obtained from the following formula.
CF = (DWp / 1.1) ^1/2 × MWp + (DWf / 1.1) ^1/2 × MWf
[DWp is the total warp fineness (dtex), MWp is the warp weave density (main / 2.54 cm), DWf
Is the total weft fineness (dtex), and MWf is the weft weave density (main / 2.54 cm). ]
(4) Heat shielding property A sample was held on 5 mm of black drawing paper, and the center of the drawing paper on the back side was measured with a thermocouple by irradiating lamp light from the sample side. When it is 53 ° C. or lower, it is good.
Use lamp: Iwasaki Electric Co., Ltd. eye lamp <spot> PRS100V500W
Irradiation distance: 50cm
Irradiation time: 15 minutes Test chamber temperature: 18-22 ° C

[Example 1]
Spinning was performed at a spinning temperature of 300 ° C. from a die drilled in four flat sections (necked portions) of polyethylene terephthalate containing 2.5% by weight of titanium dioxide as a matting agent. A flat shape having three constricted portions (maximum / minimum of the short side length C = 1.2) as shown in FIG. A polyester multifilament 44dtex / 36fil having a cross section (cross section flatness of 3.2) was obtained and used for warp.

  On the other hand, a polyethylene terephthalate containing 0.3% by weight of titanium dioxide as a matting agent is spun at a spinning temperature of 300 ° C. from a die perforated in a round cross-section, and taken up at 4000 m / min. The polyester multifilament 56dtex / 20fil having a round cross section of the filament was obtained by stretching 3 times and used for wefts.

  Next, using the warp and weft, a plain fabric was woven using a normal water jet loom. In the woven fabric, the warp density was 122 / 2.54 cm, and the weft density was 106 / 2.54 cm.

  Then, the fabric was subjected to normal dyeing finish processing, water-repellent processing, final setting, and calendar processing. At that time, the following processing agent was used for the water-repellent processing, and was squeezed at a pickup rate of 70%, dried at 130 ° C. for 3 minutes, and then heat-treated at 170 ° C. for 45 seconds. Moreover, the calendar process performed the calendar process on the conditions of a roll temperature of 160 degreeC.

<Processing agent composition>
・ Fluorine-based water repellent 10.0wt%
(Asahi Guard LS-317, manufactured by Asahi Glass Co., Ltd.)
・ Melamine resin 0.3wt%
(Sumitomo Chemical Co., Ltd., Sumtex Resin M-3)
・ Catalyst 0.3wt%
(Sumitomo Chemical Co., Ltd., Smithex Accelerator ACX)
・ Water 89.4wt%
The resulting woven fabric has a warp density of 140 / 2.54 cm, a weft density of 114 / 2.54 cm, a cover factor of 1692, a basis weight of 55 g / m ² , and 2.5% by weight of titanium dioxide as a matting agent. The blend ratio of the polyester multifilament was 50%, the average infrared reflectance was 52%, and the heat shielding property was 50.2 ° C., which was excellent in lightness and heat shielding properties.
Next, when a garment (T-shirt) was obtained and worn using the woven or knitted fabric, it was excellent in heat shielding and light weight.

[Comparative Example 1]
In Example 1, a polyester multifilament having a round cross section containing 0.3% by weight of titanium dioxide as a matting agent was used instead of the polyester multifilament containing 2.5% by weight of titanium dioxide as a matting agent. Except for this, the same procedure as in Example 1 was performed.
In the obtained woven fabric, the average infrared reflectance was 44% and the heat shielding property was 56.3 ° C., which was inferior to the heat shielding property.

  ADVANTAGE OF THE INVENTION According to this invention, the thermal-insulation knitted fabric and clothing which have not only the outstanding heat-insulation property but the outstanding lightness are provided, and the industrial value is very large.

Claims (8)

  A heat-shielding woven or knitted fabric comprising a polyester multifilament containing a matting agent of 1.0% by weight or more and having a single fiber fineness of 1.5 dtex or less.   The heat-shielding woven or knitted fabric according to claim 1, wherein the polyester multifilament has a total fineness within a range of 25 to 55 dtex.   The heat-insulating woven or knitted fabric according to claim 1 or 2, wherein in the polyester multifilament, the cross-sectional shape of the single fiber is a flat cross section having a cross-sectional flatness of 2 to 6 having two or more constricted portions. The heat-insulating woven or knitted fabric according to any one of claims 1 to 3, wherein the woven or knitted fabric is a woven fabric having a cover factor CF defined by the following formula of 1200 or more.
CF = (DWp / 1.1) ^1/2 × MWp + (DWf / 1.1) ^1/2 × MWf
[DWp is the total warp fineness (dtex), MWp is the warp weave density (main / 2.54 cm), DWf
Is the total weft fineness (dtex), and MWf is the weft weave density (main / 2.54 cm). ] The heat-shielding woven or knitted fabric according to any one of claims 1 to 4, wherein the basis weight of the woven or knitted fabric is 120 g / m ² or less.   The heat-insulating woven or knitted fabric according to any one of claims 1 to 4, wherein the woven or knitted fabric is calendered and / or water-repellent.   The heat-shielding woven or knitted fabric according to any one of claims 1 to 6, wherein an average infrared reflectance at a wavelength of 700 to 1400 nm is 48% or more.   The clothing which uses the heat-shielding woven or knitted fabric according to any one of claims 1 to 7.

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