JP2014034740A - Polyester woven or knitted fabric - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a polyester woven or knitted fabric which is composed of polyester fibers containing silica fine particles inside and has an excellent heat insulation property and further a good see-through-preventing effect even when the fabric is thin.SOLUTION: The polyester woven or knitted fabric includes polyester fibers comprising a polymer (B) constituting a core part and a polymer (A) constituting a sheath part. The polymer (A) is a polyester-based resin. The polymer (B) is a polyester-based resin containing silica having an average secondary particle diameter of 0.05 to 3.0 μm and the ratio of particles having a secondary particle diameter of 5 μm or greater is 10 vol% or less in an amount of 1 to 20 mass%. The woven or knitted fabric has a thickness of 0.8 mm or less and a transmission-coefficient T of 0.40 or less.

Description

  The present invention relates to a woven or knitted fabric made of polyester fibers containing silica fine particles therein, and has excellent heat retention even in a thin fabric and further has a good anti-slipping effect.

  2. Description of the Related Art Conventionally, it is known to use a three-layered structure using batting for sports clothing such as winter clothing, skiing, and mountain climbing. Such garments are generally composed of three layers consisting of a surface layer, batting, and lining, and the batting becomes an air heat retaining layer to enhance the heat retaining performance, but the garments composed of the three layer structure are heavy and sporty. There was a drawback that it was hung.

  In addition, there are known heat-insulating fabrics using fabrics coated with metals such as aluminum and chromium. However, when these fabrics are used in clothing, they lack flexibility due to coating, or have a heat-retaining performance when used repeatedly. There was a drawback of lowering.

  In order to eliminate the above-mentioned drawbacks, a core-sheath composite yarn is known in which functional inorganic particles having an infrared absorption effect such as zirconium carbide, zirconium silicide, tin oxide, etc. are arranged on the core and the sheath is covered with a thermoplastic resin. (For example, refer to Patent Document 1). In these core-sheath composite yarns, the functional inorganic particles arranged in the core part absorbs infrared rays to exhibit a heat retaining effect. However, these core-sheath composite yarns show a heat retaining effect in the presence of sunlight, but there is a problem that a sufficient heat retaining effect cannot be obtained in an environment where sunlight cannot be obtained such as indoors or at night.

  Also known is a polyester fiber containing silica, but the polyester fiber does not have a core-sheath structure and has a low silica content, so that the heat retention is inferior and the effect of preventing see-through cannot be obtained. was there. Furthermore, since the primary average particle diameter before dispersion of the silica used is as wide as 0.01 to 10 μm and the silica is not stirred and dispersed during polymerization of the polyester resin, the silica is strongly aggregated during spinning. There was also a problem such as poor yarn-making property (see, for example, Patent Document 2).

Japanese Patent Laid-Open No. 5-009804 JP 2002-309444 A

  An object of the present invention is to provide a woven or knitted fabric comprising polyester fibers containing silica fine particles therein, having excellent heat retention even in a thin fabric, and further having a good see-through preventing effect. There is to do.

The present inventors are a polyester woven or knitted fabric using a specific polyester fiber containing silica, and by keeping the thickness and permeability coefficient T of the woven or knitted fabric in a specific range, excellent heat retention even in a thin fabric In addition, the present inventors have found that a good see-through preventing effect is exhibited and have reached the present invention.
That is, the gist of the present invention is the following (1) to (3).
(1) A polyester woven or knitted fabric including polyester fibers composed of a polymer (B) constituting a core part and a polymer (A) constituting a sheath part, wherein the polymer (A) is a polyester resin, B) is a polyester resin containing 1 to 20% by mass of silica having a secondary average particle size of 0.05 to 3.0 μm and a ratio of secondary particle size of 5 μm or more of 10% by volume or less; A polyester woven or knitted fabric, wherein the woven or knitted fabric has a thickness of 0.8 mm or less, and the woven or knitted fabric has a permeability coefficient T of 0.40 or less.
(2) The polyester woven or knitted fabric according to (1), wherein the shape of the sheath portion of the polyester fiber is a multi-leaf cross-sectional shape having 3 to 6 protrusions.
(3) The shape of the core portion of the polyester fiber is a cross-sectional shape in which protrusions and narrow grooves continuous in the fiber length direction are alternately arranged, and the number of protrusions of the core portion is five. The polyester woven or knitted fabric according to (1) or (2), characterized in that the number is 30.

  According to the present invention, there is obtained a woven or knitted fabric made of polyester fiber containing silica fine particles therein, having excellent heat retention even in a thin fabric, and further having a good see-through preventing effect. be able to.

The cross-sectional shape of the fiber which is an embodiment of the present invention is shown. The cross-sectional shape of the fiber which is an embodiment of Example 5 is shown. The cross-sectional shape of the fiber which is an embodiment of Example 6 is shown.

  Hereinafter, the present invention will be described in detail.

  The polymer (A) constituting the polyester fiber of the present invention is not particularly limited as long as it is a polyester resin, and for example, aromatic polyester, aliphatic polyester, and the like are preferably used.

  Examples of the aromatic polyester include polyesters mainly composed of polyalkylene terephthalate such as polyethylene terephthalate (PET), polybutylene terephthalate, and polytrimethylene terephthalate.

  Examples of aliphatic polyesters include poly-α-hydroxy acids such as polylactic acid and polyglycolic acid, poly-β-hydroxyalkanos such as poly-β-hydroxybutyric acid and poly- (β-hydroxybutyric acid / β-hydroxyvaleric acid). And poly-ω-hydroxyalkanoates such as poly-β-propiolactone and poly-ε-caprolactone.

  Aromatic polyester, aliphatic polyester, and the like may be those obtained by copolymerizing the copolymerization components shown below. Representative examples of copolymer components include isophthalic acid, 5-alkali metal sulfoisophthalic acid, aromatic dicarboxylic acids such as 3,3′-diphenyldicarboxylic acid, aliphatic dicarboxylic acids such as adipic acid, sebacic acid and succinic acid, and diethylene glycol. And copolymer components such as aliphatic, alicyclic diol, and P-hydroxybenzoic acid such as 1,4 butanediol and 1,4 cyclohexanediol.

  The polymer (B) constituting the polyester fiber of the present invention is not particularly limited as long as it is a polyester resin, and for example, aromatic polyester, aliphatic polyester, and the like are preferably used.

  Examples of the aromatic polyester include polyesters mainly composed of polyalkylene terephthalate such as polyethylene terephthalate (PET), polybutylene terephthalate, and polytrimethylene terephthalate.

  Examples of aliphatic polyesters include poly-α-hydroxy acids such as polylactic acid and polyglycolic acid, poly-β-hydroxyalkanos such as poly-β-hydroxybutyric acid and poly- (β-hydroxybutyric acid / β-hydroxyvaleric acid). And poly-ω-hydroxyalkanoates such as poly-β-propiolactone and poly-ε-caprolactone.

  The aromatic polyester and aliphatic polyester may be obtained by copolymerizing the following copolymer components. Typical examples of copolymer components include isophthalic acid, 5-alkali metal sulfoisophthalic acid, aromatic dicarboxylic acids such as 3,3′-diphenyldicarboxylic acid, aliphatic dicarboxylic acids such as adipic acid, sebacic acid and succinic acid, and diethylene glycol. And copolymer components such as aliphatic, alicyclic diol, and P-hydroxybenzoic acid such as 1,4 butanediol and 1,4 cyclohexanediol.

  The polyester fiber of the present invention may contain commonly used additives, matting agents, antistatic agents, antioxidants, etc., as long as the effects of the present invention are not impaired. .

  In the present invention, the polymer (B) contains 1 to 20% by mass of silica having a secondary average particle size of 0.05 to 3.0 μm and a ratio of the secondary particle size of 5 μm or more to 10% by volume or less. It is necessary to.

  The secondary average particle diameter of the silica is the average particle diameter of the silica after being dispersed in the polyester resin, and the polyester deformed cross-section core-sheath composite fiber is mixed solvent of phenol / tetrachloroethane = 50/50% by mass as described later. Although it measures on predetermined | prescribed conditions after melt | dissolving in this, 0.05-3.0 micrometers is required and 0.1-1.7 micrometers is preferable. When the average particle diameter is less than 0.05 μm or exceeds 3.0 μm, the yarn-making property is remarkably deteriorated.

  The ratio of silica having a secondary particle diameter of 5 μm or more needs to be 10% by volume or less, and preferably 5% by volume or less. In the polyester fiber of the present invention, for example, by using a polyester-based resin polymerized by a production method described later, it becomes possible to reduce the amount of coarse silica particles present in the polyester-based resin. This is preferable because the fiber-forming property at the time of fiber formation by melt spinning can be improved. The presence of 10% by volume or more of silica having a size of 5 μm or more is not preferable because the spinning performance is significantly deteriorated.

  The secondary maximum particle size of silica is preferably less than 10 μm, more preferably less than 5 μm. When the maximum particle size is 10 μm or more, the yarn-making property is remarkably deteriorated.

  In the present invention, a polyester woven or knitted fabric showing remarkable heat retention can be obtained by using a woven or knitted fabric made of polyester fibers containing specific silica.

  The silica content in the polymer (B) needs to be 1 to 20% by mass, and preferably 2 to 15% by mass. Silica has an effect of absorbing heat rays, and has low heat conductivity, so it has excellent heat insulation properties and imparts excellent heat retention to the entire woven or knitted fabric made of polyester fiber containing silica. For this reason, when the content is less than 1% by mass, the silica content in the fiber is small, so that a sufficient heat retaining effect is not exhibited. When the content exceeds 20% by mass, the content in the fiber becomes too high, and the flexibility of the yarn is likely to be lost, which may result in a brittle fiber, and coarse particles in which silica is aggregated during spinning are likely to be generated. For this reason, the yarn forming property and workability may be remarkably deteriorated.

  The polyester fiber of the present invention has a core-sheath composite structure, and it is necessary to arrange the polyester (A) as a sheath and the polyester (B) as a core. By setting it as this core-sheath composite structure, the heat retention performance excellent in the woven / knitted fabric which consists of this polyester fiber can be provided. Furthermore, when the incident light to the polyester fiber passes through the sheath and reaches the core, it is refracted and scattered by the silica particles present in the core, so that transmitted and reflected light is reduced. A see-through preventing effect can be imparted.

  The shape of the core portion of the polyester fiber of the present invention is preferably a cross-sectional shape in which protrusions and narrow grooves that are continuous in the fiber length direction are alternately arranged. By alternately arranging protrusions and narrow grooves that are continuous in the fiber length direction, the surface area where the core containing silica is in contact with the sheath increases, so the surface area that exerts heat retention by silica is expanded. , Better heat retention performance can be obtained. Furthermore, by arranging the protrusions and the narrow grooves alternately, the incident light to the polyester fiber repeatedly refracts and scatters at the interface of the core-sheath structure of the fiber, so that a more excellent see-through preventing effect can be obtained. be able to.

  The width of the protruding portion of the core portion and the depth of the narrow groove portion can be arbitrarily set according to the intended heat retention performance and anti-through-through performance. For example, the width of the protrusion is preferably 0.2 to 1.0 μm, and more preferably 0.5 to 0.9 μm. The depth of the narrow groove is preferably 1.2 times or more, more preferably 1.5 to 2.0 times the width of the protrusion.

  5-30 pieces are preferable and, as for the number of the protrusion parts of the core part of this invention, 8-20 pieces are more preferable. By setting the number of protrusions of the core part to 5 to 30, preferably 8 to 20, the surface area of the core part in contact with the sheath part can be increased, and the heat retaining effect and the see-through preventing effect can be obtained more effectively. it can.

  The cross-sectional shape of the single fiber constituting the polyester fiber of the present invention (sometimes referred to as “the cross-sectional shape of the sheath”) is preferably a modified cross-section having 3 to 6 protrusions. By making the cross-sectional shape as described above, the density of the fiber bundle when the fibers are bundled is low and the fiber bundle has a large gap, so that air can be taken into the gap when woven or knitted. Therefore, it is possible to obtain better heat retention performance than a round cross section. If the number of protrusions exceeds 6, the cross-sectional shape becomes a shape that approximates a round cross-section, or depending on the shape, the density of the fiber bundle may increase and the heat retention performance may decrease. It is preferable to do.

  The mass ratio of the polymer (A) to the polymer (B) (polymer (A) / polymer (B)) is preferably 80/20 to 20/80, and more preferably 70/30 to 50/50. By maintaining the mass ratio of the polymer (A) and the polymer (B) (polymer (A) / polymer (B)) to 80/20 to 20/80, while maintaining the yarn-making property and workability of the resulting polyester fiber More sufficient heat retention effect can be obtained.

  In the polyester fiber of the present invention, it is preferable that the fineness of the single fiber constituting the fiber is 1.5 dtex or less, so that a remarkable heat retaining effect is obtained when it is made into a woven or knitted fabric, and 0.5 dtex to 1.3 dtex. Is more preferable, and 0.5 dtex to 1.0 dtex is even more preferable.

  Although it is not clear why the fineness of the single fiber constituting the polyester fiber is not more than 1.5 dtex, it is not clear why the fineness is 1.5 dtex or less. Since a finer space appears between the fibers, it is presumed that high heat retention is obtained thereby.

  In the polyester woven or knitted fabric of the present invention, it is necessary that the thickness of the woven or knitted fabric is 0.8 mm or less, and the permeability coefficient T of the woven or knitted fabric described later is 0.40 or less. The thickness is preferably 0.6 mm or less, and more preferably 0.5 mm or less. The transmission coefficient T is preferably 0.35 or less, and more preferably 0.30 or less.

A method for measuring the transmission coefficient T will be described.
The transmission coefficient T of the polyester woven or knitted fabric of the present invention can be obtained by the following formula (1) after measuring WI (T) using a spectrophotometer (MS-2020 type) manufactured by Macbeth.
(1) Permeability coefficient of woven or knitted fabric T = (F2-F1) / F1
However, F1: WI (T) when measured using one woven or knitted fabric
F2: WI (T) when measuring four woven or knitted fabrics

  In the polyester woven or knitted fabric of the present invention, if the thickness exceeds 0.8 mm, the heat retaining effect and the see-through preventing effect can be obtained, but since the thickness when used as clothing is too large, there is a problem that the applicable applications are limited. In particular, it is not preferable because it is not applicable to thin outer garments, midler garments, inner garments, and the like. Furthermore, if the transmission coefficient T of the woven or knitted fabric exceeds 0.40, it becomes difficult to see through when the fabrics are stacked, but when used alone, the see-through becomes large, which is not preferable.

  In the polyester woven or knitted fabric of the present invention, the heat-retaining property of the woven or knitted fabric can be obtained even when the woven or knitted fabric is a thin fabric having a thickness of 0.8 mm or less by using a polyester woven or knitted fabric containing polyester fibers containing specific silica. In addition, by keeping the permeability coefficient T low, it is possible to obtain a woven or knitted fabric that has a remarkable anti-slipping effect.

  The woven or knitted fabric of the present invention needs to contain the above-described polyester fiber, preferably 50% by mass or more, more preferably 70% by mass or more, and particularly preferably 90% by mass or more.

  In the woven or knitted fabric of the present invention, the structure of the woven or knitted fabric is not particularly limited. For example, in the case of a woven fabric, flat, twill, satin, and in the case of a knitted fabric, a tengu, a mill, a smooth, Tissue is preferably used.

  The woven density and knitted fabric density of the knitted or knitted fabric can be appropriately adjusted according to the purpose by selecting the structure and the fineness of the polyester fiber.

  Next, an example is given and demonstrated about the manufacturing method of the polyester fiber used for the polyester woven fabric of this invention.

  In the polyester fiber of the present invention, it is preferable to use silica having a primary average particle diameter of 0.05 to 3.0 μm and a ratio of primary particle diameter of 5 μm or more of 10% by volume or less.

  The primary average particle diameter of silica is the average particle diameter of silica before being dispersed in the polyester resin, and an aqueous solution containing silica is measured under predetermined conditions as described later. Preferably, 0.1 to 1.7 μm is more preferable. When the primary average particle diameter is less than 0.05 μm or exceeds 3.0 μm, the secondary average particle diameter is not preferably in the preferred range, which is not preferable.

  The proportion of silica having a primary particle diameter of 5 μm or more in silica is preferably 10% by volume or less, and more preferably 5% by volume or less. If the silica having a primary particle diameter of 5 μm or more is present in an amount exceeding 10% by volume, the secondary average particle diameter is hardly within a preferable range, and the spinning property is significantly deteriorated.

  The primary maximum particle diameter of silica is preferably less than 10 μm, more preferably less than 5 μm. When the primary maximum particle diameter is 10 μm or more, the secondary maximum particle diameter is difficult to be in a preferable range, and the yarn-making property is remarkably deteriorated.

  In the method for producing a polyester fiber of the present invention, it is preferable to use a polyester resin obtained by dispersing the silica in ethylene glycol and performing a stirring and dispersing treatment, and then polymerizing the polyester oligomer.

  The silica concentration in the silica / ethylene glycol dispersion in which silica is dispersed in ethylene glycol is preferably 1 to 30% by mass, and more preferably 2 to 20% by mass. If the silica concentration is less than 1% by mass, it is necessary to add a large amount of the dispersion to the polymerization solution, so that the temperature of the polyester oligomer during the polymerization may be lowered and solidify easily. Time is required and the amount of ethylene glycol used is increased, which is not preferable from the viewpoint of productivity. On the other hand, if it exceeds 30% by weight, coarse particles are likely to be generated due to aggregation of silica, which is not preferable.

  The stirring / dispersing treatment of the silica / ethylene glycol dispersion refers to stirring / dispersing treatment such as ultrasonic treatment or high-pressure collision (shearing) treatment such as homo-jetter. For example, a magnetic stirrer is filled with ethylene glycol previously filled in a stirring vessel. For example, after adding silica in a powder state to a predetermined concentration while stirring, the stirring and dispersing treatment may be performed. In order to improve the dispersibility of silica in the glycol component, silica may be subjected to a surface treatment, or a pH adjuster may be added to the dispersion.

  As a method for producing a polyester resin constituting the core, terephthalic acid is used as the dicarboxylic acid component, ethylene glycol is used as the glycol component, and the molar ratio of terephthalic acid to ethylene glycol is terephthalic acid: ethylene glycol = 1: 1. 4 to 1: 1.8 is charged into a polymerization kettle, and an esterification reaction is performed while stirring in a molten state at a polymerization pressure of 30 to 500 hPa and a polymerization temperature of 240 to 270 ° C. to obtain a polyester oligomer. At this time, other dicarboxylic acid components and / or glycol components may be added within a range that does not impair the properties of the resin.

  Subsequently, after adding the silica / ethylene glycol dispersion and the polycondensation catalyst subjected to the above-mentioned stirring and dispersing treatment to the polyester oligomer, the pressure in the polymerization kettle is 0.2 to 1.3 hPa while melting and stirring at 270 to 290 ° C. The polycondensation reaction is performed for about 1 to 8 hours under reduced pressure to obtain a polyester resin. The polyester-based resin can be obtained by discharging the polyester-based resin from the base of the polymerization can, cooling and solidifying, and then chipping.

  The polycondensation catalyst is not particularly limited, but metal compounds such as antimony, germanium, tin, titanium, zinc, aluminum, magnesium, potassium, calcium, sodium, manganese, cobalt, sulfosalicylic acid, o-sulfobenzoic anhydride, etc. And organic sulfonic acid compounds.

The addition amount of the catalyst is not particularly limited, but is preferably 0.5 × 10 ^{−4 to} 6.0 × 10 ⁻⁴ mol with respect to 1 mol of the acid component constituting the polyester from the viewpoints of polymerizability and thermal stability. 1.0 × 10 ^{−4 to} 5.0 × 10 ⁻⁴ mol is more preferable.

  In the method for producing the polyester fiber used in the woven or knitted fabric of the present invention, the spinning method is not particularly limited as long as a specific amount of the above-described specific polyester resin is used and a specific deformed cross-section core-sheath composite structure is used. A POY method for obtaining a semi-undrawn yarn by high-speed spinning at a speed of 2000 m / min or higher, or a melt spinning with a low-speed spinning of less than 2000 m / min or a high-speed spinning of 2000 m / min or higher, and then the wound yarn is drawn and heat-treated. And a direct spinning and stretching method in which stretching is performed without winding once.

  In the present invention, the core-sheath conjugate fiber obtained as described above may be used as it is in the fabric. For example, the fabric is subjected to post-processing such as false twist crimping, pressing, and knit deniting. It is preferable because higher heat retention can be obtained.

  The draw ratio in the false twist crimping process is preferably 1.05 to 1.5 times, and more preferably 1.1 to 1.4 times. By setting the draw ratio to 1.05 to 1.5 times, molecular orientation and crystallinity can be improved, and a crimped yarn excellent in heat resistance and strength can be obtained.

  The false twist coefficient in the false twist crimping process is preferably 26000 to 35000, more preferably 26000 to 33000, and even more preferably 27000 to 32000. By setting the false twist coefficient to 26000 to 35000, a crimped yarn having a firm crimp can be obtained.

  It is preferable that the heater temperature in said false twist crimping process is 140-220 degreeC, and it is more preferable that it is 160-200 degreeC. By setting the heater temperature to 140 to 220 ° C., the crimp is strengthened, and in addition, the effect of improving the crystallinity of the crimped yarn is achieved.

  When false twisting is performed on the polyester fibers used in the woven or knitted fabric of the present invention, the crimp can be made stronger by selecting the false twist conditions described above. The heat retention is improved more remarkably.

  In the woven or knitted fabric of the present invention, the polyester fiber obtained by the above-described method is used, and by specifying the thickness and permeability coefficient T of the woven or knitted fabric, it has excellent heat retention even in a thin fabric. Thus, a polyester woven or knitted fabric having a good see-through preventing effect can be obtained.

  The present invention will be described in more detail with reference to the following examples, but the present invention is not limited thereto. In addition, the measuring method in an Example and a comparative example is as follows.

1. Intrinsic viscosity [η]
Using an Ubbelohde viscometer, an equimass mixture of phenol and ethane tetrachloride was used as a solvent, and measurement was performed based on a conventional method under a temperature of 20 ° C.

2. Primary average particle diameter of silica, ratio of primary particle diameter of 5 μm or more After silica particles are dispersed in deionized water, the diffraction / scattering light intensity is 40 using a laser diffraction particle size distribution analyzer (SALD-7100, manufactured by Shimadzu Corporation). After adjusting the dilution with water so as to be in the range of ˜60%, the average value measured four times was taken as the primary average particle diameter and the ratio of the primary particle diameter of 5 μm or more. The primary maximum particle size was also measured by the same method.

3. Ratio of secondary average particle diameter of silica, secondary particle diameter of 5 μm or more Polyester fibers are dissolved in a mixed solvent of phenol / tetrachloroethane = 50/50 mass% so as to be 5 mass%, and the obtained solution is laser Using a diffraction particle size distribution analyzer (SALD-7100, manufactured by Shimadzu Corporation), dilution adjustment measurement is performed with the solvent so that the diffraction / scattering light intensity is in the range of 40 to 60%, and the average value of four times is averaged. The diameter and the ratio of particles were 5 μm or more. The secondary maximum particle size was also measured by the same method.

4). Silica amount in the core part Take out the single fiber from the polyester fiber, take a cross-sectional shape of the single fiber in an enlarged photograph, calculate the area of the whole single fiber and the area of the core part on the photograph, and in the core part and the sheath part Considering the specific gravity of the polyester-based resin used, the mass ratio (%) of the core was calculated. Next, about 1 g of polyester fiber is put in a crucible, weighed, and then incinerated at 400 ° C. × 2 h, and further at 600 ° C. × 3 h, and after sufficiently cooling to room temperature while suppressing moisture absorption in a desiccator, The amount of silica (g) in the residue was measured, and calculated by the following formula using the ratio of the core.
Silica amount in core (mass%) = silica amount in crucible residue (g) / (total mass of sample before incineration (g) × mass ratio of core in polyester fiber (%) / 100)

5. Thickness of woven or knitted material Measured by the thickness A method of JIS L-1096.

6). The basis weight of the woven or knitted fabric was measured by the mass A method per unit area in the standard state of JIS L-1096.

7). Thermal insulation rate It measured by the thermal insulation A method of JIS L-1096.

8). Thermal conductivity Thermal conductivity when a sample is sandwiched between a high-temperature plate (37 ° C) and a low-temperature plate (7 ° C) with a built-in temperature sensor and heat flow meter, and the sample temperature on the high-temperature and low-temperature sides and the heat flow are stable. The rate was measured. The measurement was performed 5 times and expressed as an average value.

9. Transmission coefficient T of woven and knitted fabric
Measurement was performed by the method described above.

Example 1
-Preparation of polymer (B) A slurry of terephthalic acid and ethylene glycol (terephthalic acid: ethylene glycol (molar ratio) = 1: 1.6) was continuously supplied to the esterification reactor, at a temperature of 250 ° C and a pressure of 50 hPa. A polyester oligomer having an esterification reaction rate of 95% was obtained. This polyester oligomer was fed to a polycondensation reaction can heated to 270 ° C., and the inside of the container was replaced with nitrogen. After that, the primary average particle diameter was 0.23 μm, and the volume ratio of the primary particle diameter was 5 μm or more was 0% by volume. Is added to ethylene glycol so as to be 15% by mass. K. Using a homo-jetter (manufactured by Tokushu Kika Kogyo Co., Ltd.) and a sonolator (manufactured by SONIC. CORP), stirring and dispersion treatment was performed for 4 hours. After adding the obtained silica / ethylene glycol dispersion to the polyester oligomer so that the content of silica in the polyester resin is 10% by mass, 1 mol of antimony trioxide as the polycondensation catalyst constitutes 1 mol of the acid component constituting the polyester. against after addition so as to be 3.0 × ^{10 -4} mol, and more than 1.2hPa 1 hour after gradually reducing the pressure. The polycondensation reaction was carried out for 2 hours while stirring under these conditions, and then the obtained polyester resin was chipped by a conventional method and dried to obtain a polymer (B) constituting the core. In addition, the intrinsic viscosity of the obtained polyester resin was 0.65.
-Manufacture of polyester cross-section core-sheath conjugate fiber Polyester resin having an intrinsic viscosity of 0.65 is used as the polymer (A), and the polymer (B) prepared under the above conditions is used. The cross-sectional shape of such a single fiber is a modified cross section having three protrusions, and a core-sheath composite nozzle plate (number of holes: 48 holes) having 12 protrusions in the core is used, and a polymer (A ) And polymer (B) at a mass ratio of 60/40, spinning at a spinning speed of 3500 m / min, a spinning temperature of 290 ° C., and a discharge rate of 27 g / min. Subsequently, the obtained semi-undrawn yarn was false twisted under the following conditions to obtain a 65 dtex / 48 filament false twist yarn.
<False twist conditions>
False twisting speed: 108m / min
Stretch ratio: 1.46
HP temperature: 180 ° C
Number of twists: 3723 T / M (Z twist)

Using the obtained false twisted yarn, a knitted fabric having a honeycomb mesh structure was prepared using a circular knitting machine. The obtained knitted fabric was refined under conditions of 80 ° C. × 20 minutes using an aqueous solution in which a refining agent (manufactured by Nikka Chemical Co., Ltd., “Sanmor FL”) was dissolved in water at a concentration of 2 g / L. Thereafter, disperse dye (Dystar Co., “Dianix Black HG-FS” (200%), 7.5% omf), dyeing assistant (Nikka Chemical Co., Ltd., “Nikka Sun Salt SN-130”, 0.5 cc / L) and acetic acid (0.2 cc / L) were stained at 130 ° C. for 30 minutes. The bath ratio at that time was 1:50.
The evaluation results of the obtained knitted fabric are shown in Table 1.

Examples 2-3
The same procedure as in Example 1 was conducted except that the concentration of silica contained in the polymer (B) was changed as shown in Table 1.

Example 4
The same operation as in Example 1 was conducted except that the primary average particle diameter of silica contained in the polymer (B) was changed as shown in Table 1.

Example 5
Instead of the core-sheath composite nozzle plate (48 holes) having three protrusions in the single fiber sheath and 12 in the core, there are three protrusions in the sheath as shown in Table 1. The same procedure as in Example 1 was performed except that a core-sheath composite nozzle plate (having 48 holes) having 20 core protrusions was used and the cross-sectional shape shown in FIG.

Example 6
Instead of a core-sheath composite nozzle plate (48 holes) with three single-fiber sheath projections and 12 core projections, there are six sheath projections as shown in Table 1. The same procedure as in Example 1 was performed except that a core-sheath composite nozzle plate (having 48 holes) having 12 core protrusions was used and the cross-sectional shape shown in FIG.

Example 7
Instead of a core-sheath composite nozzle plate (48 holes) with three single fiber sheath projections and 12 core projections, three single fiber sheath projections, core This was carried out in the same manner as in Example 1 except that a core-sheath composite nozzle plate (number of holes: 36 holes) having 12 protrusions was used and the discharge rate was increased to the false twisted yarn fineness shown in Table 1.

Example 8
The same procedure as in Example 1 was performed except that the amount of discharge was reduced to a false twisted yarn of 44 dtex / 48 filament (single fiber fineness: 0.92 dtex).

Comparative Examples 1 and 2
The same procedure as in Example 1 was conducted except that the concentration of silica contained in the polymer (B) was changed as shown in Table 1.

Comparative Examples 3 and 4
The same procedure as in Example 1 was performed except that the primary average particle diameter of silica contained in the polymer (B) was changed as shown in Table 1.

Comparative Example 5
The same procedure as in Example 1 was performed except that the amount of discharge was increased to a false twisted yarn of 110 dtex / 48 filament (single fiber fineness: 2.31 dtex).

Comparative Example 6
The same procedure as in Example 1 was conducted except that the silica contained in the polymer (B) was changed to titanium oxide (primary average particle size 0.25 μm).

  The obtained results are shown in Tables 1 and 2.

As in Examples 1 to 7, using a specific polyester fiber containing silica, and the woven or knitted fabric has a specific thickness and permeability coefficient, the obtained polyester woven or knitted fabric has excellent heat retention, and It was excellent in see-through prevention.
On the other hand, the woven or knitted fabric of Comparative Example 1 was inferior in see-through preventing property and heat retaining property because the content of silica in the polyester fiber was low. Since Comparative Example 2 has a high silica content of the polymer (B) in the polyester fiber, Comparative Example 3 has a very small primary average particle diameter of silica, and Comparative Example 4 has a primary average particle diameter of silica. Due to the large size, coarse particles due to secondary agglomeration of silica generated at the time of spinning were generated, and the spinning property was very poor, and fibers could not be collected stably. Since the thickness of the woven or knitted fabric of Comparative Example 5 was out of the scope of the present invention, the woven or knitted fabric became a stiff fabric and could not be applied as a thin fabric. Since the woven or knitted fabric of Comparative Example 6 used titanium oxide particles instead of silica particles, it was inferior in see-through prevention and heat retention.

1: sheath part 2: core part a: sheath part projection part b: core part projection part c: core part narrow groove part

Claims (3)

A polyester woven or knitted fabric comprising polyester fibers comprising a polymer (B) constituting a core part and a polymer (A) constituting a sheath part, wherein the polymer (A) is a polyester resin, and the polymer (B) is It is a polyester-based resin containing 1 to 20% by mass of silica having a secondary average particle size of 0.05 to 3.0 μm and a secondary particle size of 5 μm or more of 10% by volume or less. A polyester woven or knitted fabric having a thickness of 0.8 mm or less and a transmission coefficient T of the woven or knitted fabric of 0.40 or less.   The polyester woven or knitted fabric according to claim 1, wherein the shape of the sheath portion of the polyester fiber is a multi-leaf cross-sectional shape having 3 to 6 protrusions. The shape of the core of the polyester fiber is a cross-sectional shape in which protrusions and narrow grooves continuous in the fiber length direction are alternately arranged, and the number of protrusions of the core is 5 to 30 The polyester woven or knitted fabric according to claim 1 or 2, wherein: