JPH01132816A - Selectively absorptive fiber for solar heat and warmth-retentive fiber therefrom - Google Patents

Abstract

PURPOSE:To obtain the title fiber having good warmth-retentivity without need for aftertreatment such as vapor deposition or film formation, by melt (conjugate) spinning of a kneaded composition from specific carbide powder or its mixture with aluminum powder and a thermoplastic synthetic linear polymer. CONSTITUTION:The objective fiber can be obtained by (I) melt spinning, using e.g., a screw-type melt spinning machine, of a kneaded composition from (A) metal carbide powder with said metal belonging to group IV (pref. ZrC) or its mixture with aluminum powder and (B) a thermoplastic synthetic linear polymer such as polyamide or polyester or (II) melt (conjugate) spinning of said kneaded composition and the component B in the form of sheath-core type structure with said composition as the core and the component B as the sheath.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is applicable to cold-weather clothing that requires heat retention, sports and leisure clothing, interior goods such as curtains,
The present invention relates to solar heat selectively absorbing fibers and heat-retaining fibers useful for leisure goods such as tents.

Conventional Technology Traditionally, skiing, skating, and
Sports such as mountain climbing and fishing, leisure clothing, cold weather clothing,
In addition, various treatments are applied to outdoor leisure goods such as tents and interior goods such as curtains in order to impart heat retention properties. For example, a three-layer structure has been created in which batting is inserted between the outer material and the lining, and heat retention is achieved by the thickness of the air layer in the batting. Such a three-layered fabric has the disadvantage that it is heavy and bulky, which hinders free movement, especially in sports clothing that requires ease of movement. In recent years, fabrics coated with metals such as aluminum and titanium have been used as linings to reflect heat from the body on the surface of the lining, reducing the amount of heat escaping outside the garment. Reduce the amount of batting or use no batting at all, and also use metal,
Measures have been taken to efficiently absorb solar heat and prevent reflection of light rays by forming a multilayer film of dielectric materials, semiconductor materials, etc. on the surface of fabrics.

Problems to be Solved by the Invention However, with the above-mentioned vapor-deposited lining that has a heat-retaining effect, metals such as aluminum and titanium are vapor-deposited on the surface of the fabric. There are problems such as the occurrence of deposition spots due to delicate handling of the fabric during the preparation process. Also, metals, dielectric materials,
Formation of a multilayer film using a semiconductor material, etc. is achieved by: 1) Mixing fine powder of a substance that is a solar heat absorbing material with a suitable resin binder such as polyurethane, polyacrylic acid ester, etc., uniformly dispersing the mixture, and applying this dispersed mixture to the surface of the fabric. This is done by coating or printing. However, forming a multilayer film requires repeated coating or printing, which complicates the process.In addition, due to the degree of bonding between the formed film and the surface of the fabric, it is often necessary to There is a problem that peeling occurs.

The present invention solves the above-mentioned problems, and aims to provide solar heat selective absorption fibers and heat-retaining fibers that have good heat retention properties without using post-processing methods such as vapor deposition or film formation. .

Means for Solving the Problems The present invention solves the problems of the prior art by imparting high-performance solar heat selective absorption properties to the fiber itself, which is a raw material for clothing.

That is, the solar heat selectively absorbing fiber provided by the present invention is produced by melt-spinning a kneaded composition of a carbide powder of a transition metal belonging to Group 1 of the periodic table or a mixed powder of this and aluminum, and a thermoplastic synthetic linear polymer. Alternatively, it is a fibrous material obtained by melt composite spinning of the kneaded composition and a thermoplastic synthetic linear polymer.

The solar radiation spectrum has a peak near the wavelength of 0.5 μm, and 95% of the total energy is between 0.3 and 2.0 μm.
Contains % or more. Therefore, as a substance that selectively absorbs solar heat, absorption is large in the wavelength range of 0.3 to 2.0 μm, and heat emissivity is small (high reflectance) in the infrared region of 2.0 μm or more. This is a necessary condition for the material.

The carbides of transition metals belonging to Group Ⅰ of the periodic table applied in the present invention, such as TiC, ZrC, and HfC, satisfy the above material conditions, but among these substances, ZrC has the most efficient selective absorption. Used effectively. TiC+
Z r C * Hf C carbide can be used as a single powder or as a mixed powder with aluminum added: The powder should be as fine as possible, with a particle size of 1
It is desirable to use it as a fine powder of 5 μm or less, and the blending ratio of carbide and aluminum is 1:0.3 to 1.0.
The range is set to .

Examples of thermoplastic synthetic linear polymers include acrylic, nylon 6, nylon 66, nylon 610, and nylon 1.
1. Selected from polyamides such as nylon 12, polyesters such as polyethylene terephthalate and polyethylene terephthalate, and polyolefins such as polyethylene and polypropylene, especially nylon 6.66.
Polyamides such as, polyesters such as polyethylene terephthalate are effectively used.

A kneading composition of TiC, ZrC, HfC powder or a mixed powder of these and A9J and a thermoplastic synthetic linear polymer can be formed by a conventional method of adding and mixing the powder to a molten polymer. In this case, the addition ratio of carbide powder or mixed powder of carbide and AM to the polymer component is 0.3
It is desirable to set it to ~10% by weight. If the addition rate is less than 0.3% by weight, it will not be possible to provide sufficient solar heat absorption performance, and if it exceeds 10% by weight, the fluidity of the polymer will decrease and the spinnability will deteriorate. At the same time, it also causes strength deterioration.

The kneaded composition is melt-spun as it is by a conventional method, or it is melt-spun into composite fibers with the aforementioned thermoplastic synthetic linear polymer such as polyamide or polyester. For the melt spinning method, an ordinary screw type or pressure melt type extrusion spinning device can be used, but in the case of composite spinning, a kneaded composition containing a solar heat absorbing component is used as the core, and a thermoplastic synthetic linear polymer is used as the core. Do this so that it forms a core-sheath structure.

The filaments spun in this manner are knitted or woven alone or mixed with other fibers and processed into products for the intended use. When mixed with other fibers, mixed fibers, gold thread, combined twisting, mixed weaving, mixed knitting, and any other means can be used.

Moreover, in order to solve the above-mentioned problem, the heat-retaining fiber of the present invention contains the above-mentioned TiC and ZrC inside the fiber.

It contains ceramic fine particles containing HfC and having far-infrared radiation ability.

In the present invention, ceramics having far-infrared radiation ability include, for example, carbides of transition metals belonging to Group I of the periodic table such as titanium, zirconium, and hafnium, carbides of boron, silicon, and tantalum, and silicon. Bare, titanium,
Oxides such as chromium, manganese, iron, cobalt, copper, and zirconium, and their composite compositions, as well as mica, fluorite,
It refers to crystals such as calcite, and fine particles of such inorganic substances are mixed into fibers. All of these ceramics have the ability to absorb a large amount of thermal energy from a heat source, and in particular, carbides of transition metals in Group I of the periodic table selectively absorb solar energy with a wavelength of 0.3 to 2.0 μm. It has the ability to absorb, convert and radiate far-infrared thermal energy with a wavelength of 2 to 20 μm, and the ability to reflect thermal energy with a wavelength of 2 to 20 μm. By mixing such metal carbides into fibers, it is possible to Fibers have the ability to absorb solar heat and store the absorbed thermal energy internally.

Carbides of transition metals in Group 1 of the periodic table have excellent solar heat absorption and heat storage performance, and among them, zirconium carbide (ZrC) has outstanding ability and is the best. Further, aluminum may be mixed with the carbide of the transition metal of Group 1 of the periodic table in a ratio of 1:0.3 to 1.

The above ceramics are used as fine particles. i.e. 15
It is preferable to use a powder pulverized to a particle size of 1 μm or less, particularly a fine powder with a particle size of 1 μm or less.

If the particles are too large, when they are included in the fibers described below,
Problems such as clogging of the filter medium and reduction in spinnability due to yarn breakage occur during the spinning process, and even if spinning is possible, yarn breakage occurs during the drawing process.

In the present invention, the fiber containing the ceramic fine particles having far-infrared radiation ability is as follows.

Nylon 6, nylon 66, nylon 610, nylon 11. Synthetic fibers made of polyamides such as nylon 12, polyesters such as polyethylene terephthalate and polyethylene terephthalate, polyolefins such as polyethylene and polypropylene, synthetic polymers such as polybucrylonitrile and polyvinyl alcohol, cellulose chemical fibers such as rayon and acetate, etc. So-called artificial fibers can be mentioned.

The amount of the ceramic fine particles contained in the fiber is suitably 0.1% to 20% by weight, preferably 0.3% to 10% by weight, based on the weight of the fiber. In some cases, an epoch-making effect is observed at a concentration of 0.3% by weight or more, preferably 0.5% by weight or more and 7.0% by weight or less, and an extremely excellent effect is achieved even when it is substantially 5% by weight or less. That's surprising. Content is 0.
If it is less than 1% by weight, the desired heat retention property cannot be obtained, and if it is more than 20% by weight, the productivity of the fiber is poor and, in terms of yarn quality, it is not possible to obtain a fiber having sufficient strength and elongation.

Methods for incorporating ceramic fine particles having far-infrared radiation ability into fibers include a method of directly mixing them into the raw materials of the artificial fibers and spinning them, and a method of manufacturing a masterbatch in which they are contained at a high concentration using a part of the raw materials in advance. However, there is a method in which this is diluted to a predetermined concentration at the time of spinning and then spun.

An embodiment in which the ceramic fine particles are contained in the fiber will be explained with reference to a cross-sectional view of the fiber.

FIG. 1 shows a state in which ceramic fine particles are uniformly contained throughout the fiber 1, and FIGS. 2 to 8 show states in which ceramic fine particles are uniformly contained only in a specific portion of the fiber. In FIGS. 2 to 8, both FIGS. 2 and 3 have a core-sheath structure, and FIG. 2 shows a core portion 2. FIG. 3 shows a state in which ceramic fine particles are uniformly contained in the core part 2 of the sheath part 3, the sheath part 4 in the sheath part 4, and the sheath part 4 in the core part 5, respectively, and FIG. Figure 5 shows the state in which it is contained in three parts 7a, 7b, and 7c on the surface of 1.
It has a 6-division structure, and shows a state in which contained portions 8 and non-contained portions 9 are arranged alternately.
It has a layered structure, with a middle layer 10 containing it and a center layer 11 not containing it.
Fig. 7 shows a side-by-side three-layer structure, consisting of a central part 12 containing a material and both side parts 13a and 13b not containing it,
8 shows a seabird structure in which contained island portions 14 are scattered at a plurality of locations within an uncontained sea portion 15.

Among the fibers with the above-mentioned cross-sectional structure, the fiber shown in Figure 1 contains ceramic fine particles uniformly throughout its cross-section, so it is unavoidable that the fiber has a somewhat low level of strength. The fibers shown in Figures 2 to 8 are parts 3, 5, 6, and 9 that do not contain ceramic fine particles, respectively.
．． lla, llb.

13a, 13b, and 15, it has the advantage that the decrease in strength due to the inclusion of ceramic fine particles is reduced depending on the degree. Also the second
The fibers shown in Figures 6 and 8 have a core portion 2.0 containing ceramic fine particles. Since the middle layer portion IO1 island portion 14 is located inside the fiber and is not exposed on the surface, ceramic fine particles in the fiber are exposed to the rollers and guides of spinning machines, looms, knitting machines, etc. during the production of fibers and woven and knitted products. It has the advantage of not being damaged by friction.

In addition, the fibers shown in FIGS. 4, 5, and 7 have the parts 7a, 7b, 7c, and 8°1 containing ceramic fine particles.
2 are exposed on the surface of the fibers, but the degree of exposure is less than that of the fibers shown in FIG. 1, and the above-mentioned problem of frictional damage is also reduced accordingly. In the fibers shown in FIGS. 2 to 8, the portions containing ceramic fine particles and the portions not containing ceramic particles may be made of different types of fiber raw materials.

In addition to the embodiments shown in FIGS. 1 to 8, there are various ways of incorporating ceramic fine particles into the fibers.

The heat-retaining fiber containing ceramic fine particles having far-infrared radiation ability of the present invention is used for filling of futons, quilting, bedding, foot warmer filling, etc., but this fiber can also be used for fabrics, knitted fabrics, non-woven fabrics, etc. It is used for a wide range of purposes as a fabric. Note that this fiber can also be mixed with different types of fibers containing ceramic fine particles or other ordinary fibers by blending, blending, twisting, interweaving, interweaving, etc. Further, the fabric is subjected to various processing treatments such as dyeing and resin processing as necessary, and then used for various purposes.

The resulting fabric has excellent heat retention properties, so it can be used in ski wear such as ski jackets, ski dresses, and ski pants that require heat retention (can be used as either the outer or lining material), as well as sweatshirts. clothing, sweatshirts, shirts, tights, windbreakers, training wear.

Underwear, swimwear, wetsuits, sports clothing such as wetsuit lining, mountain climbing, fishing,
Cold protection clothing for outdoor sports such as hunting (can be used as both outer and lining), linings and insoles for winter sports shoes, sports goods such as outer and lining for hats and gloves, cold protection clothing for daily use, and work. General clothing such as underwear, cold protection underwear, belly bands, socks, etc.
Lining materials for shoes, boots, gloves, etc.1 Blankets, electric blankets,
Sheets, pine tresses, bedding, curtains, carpets, hot carpet fabrics, kotatsu hooks,
It can be used for a variety of purposes, including interior products such as kotatsu mats, lap blankets, and cushions, tents, bedding, agricultural heat insulation materials, heat insulation cover materials, and synthetic leather base fabrics for gloves.

Effect TiC, ZrC, HfC or a mixture of these and A-type components has the property of absorbing light energy of approximately 0.6 V or more and reflecting light of lower energy.
．． It acts effectively to selectively absorb solar energy of 3 to 2.0 μm. Therefore, by weaving a single fiber containing such an excellent solar heat absorbing component within its structure, a cloth as a whole can be obtained which has the function of efficiently absorbing solar energy and preventing radiation loss.

Furthermore, in the heat-retaining fiber of the present invention, the ceramic contained in the fiber has far-infrared radiation ability, that is, wavelength 0.3 to 2.
．． It has the ability to selectively absorb solar energy with a wavelength of 0 μm, the ability to convert and radiate thermal energy with a wavelength of 2 to 20 μm (far infrared rays) after absorption, and the ability to reflect thermal energy with a wavelength of 2 to 20 μm, As a result, the fiber containing the ceramic fine particles internally radiates the energy once absorbed, and also shields thermal energy from the inside and suppresses leakage to the outside, so it exhibits good heat retention.

Examples Example 1 ZrC powder having a particle size of 10 μm or less was blended with melted nylon 6 at an addition rate of 2% by weight, and sufficiently kneaded to prepare a uniformly dispersed kneaded composition. This kneaded composition was discharged as 700 filaments using a screw-type melt spinning machine. Problems such as yarn breakage did not occur during the spinning stage, and the yarn spinnability was good.

The above-mentioned solar heat selectively absorbing fiber was used as a raw yarn and woven into a plain-woven taffeta. The heat retention properties were measured using the fabric samples thus obtained and the nylon fabric (blank material) that was not provided with solar heat absorption performance. The results are shown in Table 1. Among the characteristic items, heat consumption and thermal conductivity were measured using a ThermoLab testing machine.

Moisture permeability was determined by the cup method of JIS L-1099.

(Left below) Table 1 The above fabric sample and blank were irradiated with a SOOW photographic lighting lamp at a distance of 1.5 m, and after about 3 minutes, the heat distribution state on the fabric surface was measured using a thermopure camera. was photographed. Figure 9 shows the thermo pattern, and Figure 9 ■ is a fabric sample.

Figure 9 (■) shows the blank material.

From the heat retention properties and thermopattern results, it is recognized that the fabric sample woven using the solar heat selective absorption fiber of the present invention has higher heat conduction and heat absorption performance than the blank material.

Example 2 5 parts of ZrC powder with a particle size of 3 μm or less and A with a particle size of 1 μm or less
A mixed powder was prepared by blending 3 parts of M powder, and this mixed powder was mixed with nylon 6 at an addition rate of 5% by weight, melted and kneaded using a twin-screw extruder, and then extruded into water to form pellets. Using this pellet-like kneaded composition and nylon 66, a composite filament having a core-sheath structure with the kneaded composition as a core and nylon 66 as a sheath was produced by a conventional composite spinning method.

The obtained composite filament capable of selectively absorbing solar heat was used as a raw yarn and plain woven in the same manner as in Example 1 to weave a multi-lid.

The heat distribution pattern of the above fabric sample and a blank material woven only from nylon 6 was measured using a thermopure camera in the same manner as in Example 1, and is shown in FIG. 1st O
In the figure, ■ indicates a fabric sample made of the fiber of the present invention, and ■ indicates each thermopattern of a blank material.

Example 3 A ceramic mixed composition was prepared by uniformly melting and mixing 20 parts by weight of zirconium carbide (ZrC) fine particles having a particle size of 0.7 μm and 80 parts by weight of nylon 6 having an intrinsic viscosity of 1.15. This ceramic mixed composition and an intrinsic viscosity of 1.1
5 and nylon 6 were uniformly melted and mixed at a weight ratio of 15:85 and spun, and after cooling and solidifying, the spinning speed was 4.000 m/win.
A multifilament yarn of 70 denier/24 filaments was obtained by winding at a speed of . spinning.

No problems such as thread breakage or wrapping occurred during the winding process. The obtained multifilament yarn is warp,
Weaving was carried out using both the weft yarns to obtain a plain woven fabric having a warp density of 116 yarns/inch and a weft yarn density of 78 yarns/inch.

For comparison with this example, a sample of Comparative Example 1 below was prepared.

Comparative Example 1 Using the same nylon 6 as used in Example 3 above, spinning and weaving were performed in the same manner and under the same conditions as in Example 3, except that zirconium carbide was not mixed, to produce a nylon 6 multifilament of 70 denier/ A plain woven fabric of the same standard using 24 filaments was obtained.

The heat retention properties of the plain fabrics of Example 3 and Comparative Example 1 were measured, and the results are shown in Table 2.

Space below> Table 2 x Notes: Heat retention...In a constant temperature room at 20℃ and 60%.

Toow for photography as an energy source Using a white light source, measure the surface temperature of the fabric. Thermopure (infrared center, Measured using a JEOL (manufactured by JEOL Ltd.).

As is clear from Table 2, the fabric of Example 3 is the same as that of Comparative Example 1.
Compared to other textiles, the fabric absorbs the energy of the light source well and does not let it escape, increasing the surface temperature of the fabric, exhibiting high heat absorption performance and good heat retention.

Example 4 4 parts by weight of zirconium carbide fine particles having a particle size of 0.7 μm and 96 parts by weight of polyethylene terephthalate having an intrinsic viscosity of 0.8 were uniformly melted and mixed to prepare a ceramic mixed composition.

This ceramic mixed composition and polyethylene terephthalate having an intrinsic viscosity of 0.8 were mixed in a weight ratio of 50:50.
A composite filament with a concentric core-sheath structure as shown in Fig. 2, in which the former forms the core, is melt-spun at 300°C, and after cooling and solidifying, it is wound and stretched at a speed of look/inch to form a core-sheath type. A ceramic-containing multifilament yarn of 50 denier/24 filaments was obtained.

Using the multifilament yarn described above as the front yarn and a regular polyethylene terephthalate multifilament yarn 50 denier 736 filament that does not contain ceramics as the back yarn, a tricot half with a number of courses of 50/inch and a number of wales of 33/inch is made. Edited.

For comparison with this Example 4, a sample of Comparative Example 2 below was prepared.

Comparative Example 2 Using the same polyethylene terephthalate as used in Example 4 above, melt spinning was carried out using the same method and conditions as in Example 4 without adding zirconium carbide.
The yarn was wound and drawn to obtain a polyethylene terephthalate multifilament yarn of 50 denier 736 filament. This multifilament yarn was used as the front yarn and knitted in the same manner as in Example 4 to obtain a tricot half of the same specification.

The heat retention properties of the tricot halves of Example 4 and Comparative Example 2 were measured, and the results are shown in Table 3.

Table 3 As is clear from the results shown in Table 3, the fabric of Example 4 well absorbed the energy of the light source and did not release it, the surface temperature of the fabric increased, and it exhibited good heat retention.

Example 5 4 parts by weight of titanium carbide fine particles having a particle size of 0.9 μm and 96 parts by weight of polyethylene terephthalate having an intrinsic viscosity of 0.8 were uniformly melted and mixed to obtain a ceramic mixed composition. This ceramic mixed composition and polyethylene terephthalate having an intrinsic viscosity of 0.8 were melted at a weight ratio of 30:70 at 300°C to form a composite filament having a concentric core-sheath structure as shown in Fig. 2, with the former serving as the core. After spinning, cooling and solidifying 100
Winding at a speed of 0m/+iin.

A core-sheath type ceramic-containing multifilament yarn of 150 denier/48 filament was obtained by drawing.

The multifilament yarn 150 denier/48 filament was false-twisted using a false twisting machine LS-6 model (manufactured by Mitsubishi Heavy Industries ■), with a false twist number of 2370 T/M and a first heater temperature of 200.
℃, the second heater temperature is 180℃, the first overfeed rate is 0%, and the second overfeed rate is 15%.The resulting ceramic-containing false-twisted yarn is made into a reversible knitted fabric without back needles. A 150 denier, glossy normal triangular cross-section polyester false-twisted bulky thread was used for the back weave, and for the front weave, which was prepared separately.

- A reversible knitted fabric without back needles was knitted using a J-36 model 9 knitting machine (30 inches x 22G) manufactured by Toyota Industries Corporation using the Lu/36 filament.

For comparison with Example 5, a sample of Comparative Example 3 below was prepared.

Comparative Example 3 Using the same polyethylene terephthalate as used in Example 5 above, melt spinning was carried out using the same method and conditions as in Example 5 without adding zirconium carbide.
It was wound up and drawn to obtain a polyethylene terephthalate multifilament yarn of 150 denier/48 filament. Using this multifilament yarn, a reversible knitted fabric of the same specifications using polyethylene terephthalate fibers was obtained in the same manner as in Example 5.

The heat retention properties of the reversible knitted fabrics of Example 5 and Comparative Example 3 were measured, and the results are shown in Table 4.

(Left below) Table 4 As is clear from the results shown in Table 4, the fabric of Example 5 absorbed the energy of the light source and did not release it, the surface temperature of the fabric increased, and it exhibited good heat retention. .

Example 6 Manganese dioxide 60% by weight, ferric dioxide 20% by weight,
Ceramic fine particles 20 which are mixed and sintered with 10% by weight of copper oxide and 10% by weight of cobalt oxide and then ground to a particle size of 0.5 μm.
A ceramic mixed composition was obtained by uniformly melt-mixing parts by weight of polyethylene terephthalate and 80 parts by weight of polyethylene terephthalate having an intrinsic viscosity of 1.1. This ceramic composition and polyethylene terephthalate having an intrinsic viscosity of 1.1 were uniformly melt-mixed at a weight ratio of 10:90 and then spun.

After cooling and solidifying, it was wound up and drawn at a speed of 1000 m/+sin to obtain a ceramic-containing multifilament yarn of 75 denier/24 filaments.

The multifilament yarn was used for both the warp and the weft, and the warp density was 116 threads/inch and the weft density was 78 threads/inch.
An inch of plain fabric was obtained.

For comparison with this Example 6, samples of Comparative Examples 4 and 5 below were prepared.

Comparative Example 4 A polyethylene terephthalate mulch was produced by melt spinning, winding, and stretching in the same manner and conditions as in Example 6, except that the same polyethylene terephthalate as used in Example 6 was used and ceramic fine particles were not mixed. A filament yarn of 75 denier/24 filaments was obtained. A plain woven fabric having the same specifications as in Example 6 was woven using this multifilament yarn. - Comparative Example 5 The plain woven fabric obtained in Comparative Example 4 above was coated with 3 x 10-' wHg to 5 x 10-' using an aluminum vapor deposition device.
An aluminum vapor-deposited fabric was obtained by vapor-depositing aluminum metal vaporized under reduced pressure of mHg to a thickness of 10 μm.

The heat retention properties of the fabrics obtained in Example 6 and Comparative Examples 4 and 5 were measured, and the results are shown in Table 5.

Table 5 As is clear from the results shown in Table 5, the fabric obtained in Example 6 absorbs the energy of the light source better than the fabric of the comparative example, does not release it, increases the surface temperature of the fabric, and exhibits good heat retention. showed his sexuality.

Example 7 Ferric dioxide 80% by weight, manganese dioxide 15% by weight,
After mixing and sintering 5% by weight of cobalt oxide, 15 parts by weight of ceramic fine particles pulverized to a particle size of 0.8 μm and an intrinsic viscosity of 0.
85 parts by weight of polyethylene teresitalate of No. 8 were uniformly melted and mixed to obtain a ceramic mixed composition. This ceramic mixed composition and polyethylene terephthalate with an intrinsic viscosity of 0.8 were uniformly melt-spun at 300°C in a weight ratio of 20:80, and after cooling and assimilation, it was wound at a speed of 1000 m/sun and stretched to 50 m/sun. A ceramic-containing multifilament yarn of denier/24 filament was obtained.

A tricot half having 52 courses/inch and 47 wales/inch was knitted using the multifilament yarn as both the front yarn and the back yarn.

For comparison with this Example 7, samples of Comparative Examples 6 and 7 below were prepared.

Comparative Example 6 A polyethylene terephthalate mulch was produced by melt spinning, winding, and stretching in the same manner and conditions as in Example 7, except that the same polyethylene terephthalate as used in Example 7 was used and ceramic fine particles were not mixed. A filament yarn of 50 denier/24 filaments was obtained. This multifilament yarn was used to knit a tricot cloth of the same specifications as in Example 7.

Comparative Example 7 The tricot half obtained in Comparative Example 6 was subjected to aluminum vapor deposition using the same method and conditions as in Comparative Example 5 to obtain an aluminum vapor-deposited fabric.

The heat retention properties of the fabrics obtained in Example 7, Comparative Example 6, and Comparative Example 7 were measured, and the results are shown in Table 6.

Table 6 As is clear from the results shown in Table 6, the fabric obtained in Example 7 absorbed the energy of the light source better than the fabric of the comparative example, and the surface temperature of the fabric increased, resulting in good performance. It showed excellent heat retention.

Effects of the Invention According to the present invention, fibers are provided that selectively absorb solar heat efficiently and in which substances with low heat radiation are uniformly interposed in the tissue, so that the properties when made into clothing are similar to those of the conventional technology due to film formation. Phenomena such as the interfacial peeling seen in the above do not occur at all, and stable solar heat selective absorption performance can be maintained at all times.

In addition, the heat-retaining fiber of the present invention contains ceramic fine particles such as zirconium carbide that selectively absorbs solar heat and has the ability to emit far-infrared rays. It selectively absorbs solar heat in the 2.0 μm region and converts it into wavelengths of 2.0 to 20 μm.
The ability to convert and radiate (far-infrared) thermal energy,
It has the ability to reflect thermal energy with a wavelength of 2 to 20 μm, which allows the absorbed energy to be efficiently radiated internally, as well as blocking thermal energy from the body and suppressing leakage to the outside. It has excellent heat retention, there is no cost increase due to conventional post-processing, there is no problem such as interfacial peeling between the film and the fabric, and there is no uneven performance! Therefore, the solar heat selectively absorbing fibers and heat-retaining fibers of the present invention can be used in the form of fibers, threads, or fabrics for sports and leisure clothing that require heat retention, interior goods such as curtains, and outdoor leisure items such as tents. It exhibits excellent effects when applied to supplies, etc.

[Brief explanation of the drawing]

Figures 1 to 8 are schematic cross-sectional views schematically showing an embodiment of the heat-retaining fiber of the present invention containing ceramic fine particles having far-infrared radiation ability, and Figure 9 (■) is Example 1 of the present invention. Figure 9 (■) is a diagram showing the same thermo-pattern for the blank material, and Figure 10 (■) is a diagram showing the thermo-retention properties of the fabric obtained in Example 2 of the present invention. A diagram showing a thermo pattern in the measurement, and FIG. 10 (2) is a diagram also showing a thermo pattern in a blank material. Agent Yoshihiro Morimoto Figure 1 Figure 2 Figure 3 Figure 7 Figure β Figure 7■ ■ Figure 1σ ■

Claims (1)

[Scope of Claims] 1. A kneaded composition of a transition metal carbide powder belonging to Group IV of the Periodic Table or a mixed powder of this and aluminum and a thermoplastic synthetic linear polymer is melt-spun, or the kneaded composition is A fiber that selectively absorbs solar heat obtained by melt-spinning composite fibers and thermoplastic synthetic linear polymers. 2. ZrC is a transition metal carbide belonging to Group IV of the periodic table.
The solar heat selectively absorbing fiber according to claim 1. 3. The solar heat selectively absorbing fiber according to claim 1, wherein the thermoplastic synthetic linear polymer is polyamide or polyester. 4. A kneaded composition in which the addition rate of carbide powder of a transition metal belonging to Group IV of the periodic table or a mixed powder of this and aluminum to the thermoplastic synthetic linear polymer is 0.3 to 10% by weight. The solar heat selective absorbing fiber described. 5. The solar heat selectively absorbing fiber according to claim 1, wherein the melt composite spun structure has a core-sheath structure in which the kneaded composition is the core and the thermoplastic synthetic linear polymer is the sheath. 6. A heat-retaining fiber containing 0.1 to 20% by weight of ceramic fine particles capable of emitting far infrared rays inside the fiber.