Fabric and clothing with excellent heat dissipation

Abstract

To provide a fabric which includes far-infrared radiation ceramics having a continuous heat radiation function which can efficiently and continuously radiate heat that a human body radiates outside clothing much more than a conventional case and which is excellent in heat radiation property, and to provide a garment excellent in heat radiation property using the fabric, and an ink material including the far-infrared radiation ceramics, which is suitable for printing of the fabric.SOLUTION: In a fabric, a resin ink component including far-infrared radiation ceramic powder is impregnated from a surface side so that the component does not reach a rear face, and the fabric is excellent in heat radiation property.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a fabric having excellent heat dissipation properties, clothing using this fabric, and a resin ink in which a heat dissipation material used for these fabrics is dispersed.

Background Art

[0002] Clothes are made to easily adapt to the environment by natural resistance functions, such as making it easier to keep warm from the cold of the outside air by an immobile air layer, or providing a heat shielding layer to block sunlight and protect the skin. Furthermore, since the human body itself generates heat and sweats, wearing clothes in an environment with a high outside air temperature such as in summer makes it difficult to spend comfortably because heat accumulates in the clothes or they become sticky with sweat. Therefore, in order to spend summer comfortably, various fabrics and clothes have been proposed to cope with heat from various viewpoints such as breathability, high contact cold sensitivity due to heat conductivity and heat diffusivity, heat shielding properties, and cooling by rapid water absorption and drying of sweat.

[0003]

[0004] For example, a structure that promotes heat dissipation by ensuring breathability such as a mesh has been proposed (see, for example, Patent Document 1). Certainly, while heat does not accumulate, fabrics with large gaps such as mesh or lattice are likely to have limited application scenarios and it is difficult to ensure versatility, and large gaps are unsuitable for heat shielding.

[0005] In addition, focusing on the contact cold feeling that gives a cool feeling when worn, fibers obtained by spinning a thermoplastic elastomer excellent in contact cold feeling and added with an inorganic filler for the purpose of preventing stickiness when wet have been proposed (see Patent Document 3). Separately, a contact-cooling material using ultra-high molecular weight polyethylene fibers with high thermal conductivity has also been proposed. These contact-cooling sensations evaluate the initial heat transfer, but consideration for continuous heat dissipation during wearing is also desired.

[0006] In addition, a composite fiber composed of a sheath component made of a hydrophilic and thermally conductive ethylene-vinyl alcohol copolymer and a core component made of a hydrophobic polyester, which utilizes the heat of vaporization due to the evaporation of sweat, has been proposed (see, for example, Patent Document 4).

[0007] Also, as a material that can efficiently utilize sweat during sweating to obtain a cooling sensation through the heat of vaporization, a synthetic fiber containing 0.8 to 12.0% by mass of white fine particles composed of stannic oxide doped with antimony oxide, or white fine particles composed of stannic oxide doped with antimony oxide coated on other inorganic fine particles, and a water-absorbing and diffusing fiber, and a cooling fabric characterized in that the water absorption rate on the back surface by the dropping method is 5.0 seconds or less has been proposed (see, for example, Patent Document 5). However, in such technologies that assume sweating, it is hard to say that they are effective for heat dissipation in situations where sweating is difficult after air cooling.

[0008] In addition, fibers to which chemicals or the like are applied have also been proposed, but they are not always sufficient for long-term use after washing or the like, and deterioration and functional degradation are likely to occur.

Prior Art Documents

Patent Documents

[0009]

Patent Document 1

Patent Document 2

Patent Document 3

Patent Document 4

Patent Document 5

[0010] The applicants have been attempting to develop fabrics that maintain the effect of far-infrared radiation while worn, and clothing using these fabrics, by printing ink materials containing far-infrared radiating substances derived from artificial minerals onto woven or knitted fabrics. However, since far-infrared radiating substances themselves have no directionality, if these substances are kneaded into threads or attached to fibers, they will radiate far-infrared rays in all directions. Indeed, if the fabrics containing far-infrared radiating substances are used for warming the body as is generally assumed, the presence or absence of directionality is not an issue, since there is no problem if the far-infrared rays radiated by heat generated within the body are directed toward the surface of the body.

[0011] On the other hand, if the purpose is to dissipate heat, the radiation of far-infrared rays, which has no directionality, will remain as is, so even if the heat generated inside the body is radiated as far-infrared rays, they will return to the body, and the heat dissipation efficiency will be reduced accordingly. In this sense, it can be said that it is more difficult to achieve efficiency in heat dissipation clothing by incorporating far-infrared emitting ceramics into the fabric than in the case of warming clothing.

[0012] In this way, in order to obtain fabrics and clothing that utilize non-directional far-infrared emitting materials while still obtaining a sufficient heat dissipation effect to the outside of the body, it is necessary to continuously increase the cooling efficiency so that it is not diminished by heat generation, by considering the material of the far-infrared emitting material to be applied to the fabric and the positioning when applying the far-infrared emitting material to the fabric.

[0013] Therefore, the problems to be solved by the present invention are to provide a fabric excellent in heat dissipation containing far-infrared radiation ceramics having a continuous heat dissipation function capable of continuously dissipating heat generated by the human body to the outside of clothing more efficiently than before, a clothing excellent in heat dissipation using the same, and an ink material containing far-infrared radiation ceramics suitable for printing these fabrics. Further, it is to provide a fabric that is difficult to inhibit breathability and quick-drying property while ensuring heat dissipation, and clothing using the same.

Means for Solving the Problems

[0014] The first means for solving the problems of the present invention is a fabric excellent in heat dissipation in which a resin ink component containing far-infrared radiation ceramic powder is penetrated from the surface side so as not to reach the back surface. The far-infrared radiation ceramic powder in the penetrated ink component is preferably dispersed in the depth direction, and more preferably, the far-infrared radiation ceramic powder is dispersed so that a large amount is dispersed on the surface side of the fabric and decreases near the back surface in the depth direction and is inclined and distributed. Further, the penetration depth is preferably 90% of the depth from the surface to the back surface, and more preferably 80 to 90% of the depth from the surface.

[0015] The second means is that the far-infrared radiation ceramic powder has a volume average particle size of 1 to 5 μm, and is the fabric excellent in heat dissipation according to the first means. Preferably, it is 4 μm or less, and more preferably 3.5 μm or less.

[0016] The third means is that the far-infrared radiation ceramic powder has an emissivity of 0.70 to 0.95 at a wavelength of 4 μm to 100 μm at 40°C, and is the fabric excellent in heat dissipation according to the first or second means.

[0017] The fourth means is that the far-infrared radiation ceramic powder has an emissivity of 0.70 to 0.95 at a wavelength of 4 μm to 20 μm at 40°C, and is the fabric excellent in heat dissipation according to any one of the first to third means.

[0018] The fifth means is a fabric excellent in heat dissipation according to any one of the first to fourth means, characterized in that the resin ink component contains 1 to 5% by mass of far-infrared radiation ceramic powder with respect to the water-soluble acrylic resin.

[0019] The sixth means is a fabric excellent in heat dissipation according to any one of the first to fifth means, characterized in that the difference between the surface contact cool feeling value and the back surface contact cool feeling value is 0.010 to 0.100 W / cm 2 and is.

[0020] The seventh means is a clothing excellent in heat dissipation using the fabric according to any one of the first to sixth means.

[0021] The eighth means is a resin ink for fabric printing, which contains 1 to 5% by mass of far-infrared radiation ceramic powder having a volume average particle diameter of 1 to 5 μm with respect to the water-soluble acrylic resin, and the emissivity of the far-infrared radiation ceramic powder at a wavelength of 4 μm to 100 μm at 40 ° C is 0.70 to 0.95.

Advantages of the Invention

[0022] According to the present invention, since the ink component of the far-infrared radiation ceramic does not reach from the surface to the back surface of the fabric with the printed surface, the far-infrared radiation from the far-infrared radiation ceramic is dispersed and oriented in large numbers near the surface of the fabric. Therefore, when wearing the back side of the fabric against the skin as clothing, body heat can be continuously dissipated efficiently.

[0023] In addition, since the fine powder only adheres to the fibers of the fabric by the resin ink, the comfort is not significantly impaired, it is not easily washed off even after washing, and a stable and continuous heat dissipation effect can be obtained. In addition, since the surface contact cool feeling value is higher than that of the back surface, heat dissipation is easily ensured, the ink component of the far-infrared radiation ceramic powder does not penetrate to the back surface, and the heat on the back surface side can be efficiently dissipated.

[0024] In addition, when the ink component is printed on a part of the surface without covering the entire surface of the fabric, the air permeability and quick-drying property of the part not covered with the resin ink can be maintained while ensuring heat dissipation, so that the original properties of the fabric can be utilized while ensuring heat dissipation.

Brief Description of the Drawings

[0025]

Figure 1

Figure 2

Figure 3

Embodiments for Carrying Out the Invention

[0026] The materials of the resin ink and the base fabric used for the fabric excellent in heat dissipation used in the present invention are as follows.

[0027] (Base fabric) The base fabric can be applied to any of woven fabrics, knitted fabrics, and non-woven fabrics as long as it is a fabric capable of printing the ink containing far-infrared radiation ceramics on one surface. Hereinafter, as an example of the base fabric, a knitted fabric of nylon bare plain weave will be described. However, in addition to nylon, the material of the fabric can also be polyester with excellent contact cold feeling value, cotton, or a blend of cotton and polyester, etc., which can be preferably used because they can be dried and set after printing.

[0028] (Far-infrared radiation ceramics) The far-infrared radiation ceramics of the present invention are ceramics that emit electromagnetic waves in the wavelength range of far-infrared rays, i.e., from 4 μm to 20 μm, when heated. In the present invention, it is preferable that the emissivity of the far-infrared radiation ceramics at a wavelength of 4 μm to 20 μm at 40 °C is 0.70 to 0.95. It should be noted that the present invention is not intended for the human body of the wearer to be warmed by emitting far-infrared rays, but is used to promote heat dissipation. Therefore, it is not aimed at the skin layer vibrating thermally. Ceramics with an emissivity of 0.70 to 0.95 at a wavelength of 4 μm to 100 μm at 40 °C are also suitable.

[0029] Note that the emissivity is the ratio of the radiant emittance of a radiator to the radiant emittance of a blackbody at the same temperature as that radiator (JIS Z8117). It is the ratio of the amount of energy radiated from the surface of a substance at a certain temperature to the amount of energy radiated from a blackbody (a virtual object that absorbs 100% of the energy given by radiation) at the same temperature, and thus takes a value between 0 and 1.

[0030] The emissivity can be determined, for example, by measurement using an FT-IR spectrometer. Set the temperatures of a blackbody furnace (which approximately reproduces a blackbody) and a sample heating furnace to the temperature at which measurement is desired. First, measure the radiation energy of the blackbody furnace stabilized at the set temperature as the background, and then switch the optical path to the sample heating furnace side and measure the radiation energy from the surface of the sample heated to the set temperature.

[0031] As components of the far-infrared radiation ceramics, for example, SiO 2 , FeO, Al 2 O 3 , BaO, ZrO 2 , CeO 2 , TiO 2 , ThO 2 , MgO, and 3Al 2 O 3 ·2SiO 2 , ZrO 2 ·SiO 2 , 2MgO·2Al 2 O 3 ·5SiO 2Examples of such composite compounds include, but are not limited to these, as long as they are general far-infrared radiation ceramics. In the present invention, one or several kinds of such far-infrared radiation ceramics are contained and the powder is used as an ink component. The powder may be mixed with a metal having high heat dissipation. In view of the electromagnetic wave energy that increases and decreases by resonance and interference for each frequency, efficiency can also be achieved by adjusting the combination of these components.

[0032] Also, the size of the powder is a particle size with a volume average particle diameter of 1 to 5 μm. The average particle diameter is preferably 4 μm or less, more preferably a powder with an average of 3.5 μm or less. From the viewpoints of workability such as the fact that it is easy to maintain the state of being dispersed as an ink component and that it can penetrate within a range that does not reach the back surface when printed on the fabric during printing, and from the viewpoint of the property of being worn so as to touch the bare skin as a clothing with excellent heat dissipation, the far-infrared radiation ceramic powder suitable in the present invention is preferably a fine powder with a small average particle diameter as described above. On the other hand, if the powder size is too large, it will have a rough texture when applied, so it will not be suitable for underwear.

[0033] In the examples, for example, an ore of 40% polysilicon, 30% black silica, 25% alumina, and 5% zirconia by mass% was dissolved, finely pulverized with a pulverizer such as a ball mill after cooling, and then classified to remove coarse powders, and a powder with an average particle diameter of 3.5 μm was obtained. The components of this powder are SiO 2 is 45 to 60% by mass, and hereinafter, about 5 to 10% of FeO, Al 2 O 3 , BaO, ZrO 2 , CeO 2 , K, Ca, and other impurities. The emissivity of this powder at 40 °C from 4 μm to 20 μm is 0.70 to 0.90, and the emissivity from 4 μm to 100 μm is 0.7 to 0.95, which corresponds to the far-infrared radiation ceramic powder of the present invention.

[0034] (Resin ink) To the water-soluble acrylic resin of the binder, 1 to 5 mass% of far-infrared radiation ceramic fine powder with a particle size of 3.5 μm was added and stirred to obtain a resin ink. Additionally, an appropriate amount of water may be blended as needed, or a cross-linking agent may be blended as required. It may be contained in an amount exceeding 5%, but the effect due to the blending of the far-infrared radiation ceramic powder saturates, so a significant improvement in properties cannot be obtained. Therefore, it is set to 1 to 5%. In the examples, inks containing 30 g or 50 g per 1 kg of acrylic resin were used for printing.

[0035] (Printing process) On the surface of a base fabric (2) with a thickness of 0.3 to 0.4 mm, for example, printing and dyeing are performed using a rotary screen printing machine with 1500 meshes, and the coating amount is set so that the ink component (3) applied from the surface (4) does not reach the back surface (5), and it is made to penetrate into the fabric (2). As shown in Figure 1, when the ink coating amount during printing is set so that the penetration depth (7) is about 8 to 90%, the heat dissipation efficiency is improved. In printing and dyeing by printing, as shown in Figure 2(a), the concentration of the powder becomes thinner from the front side toward the back side (the side in contact with the skin). Note that Figure 2(b) shows the result of repeating the printing and dyeing by printing three times to penetrate the powder to the back surface.

[0036] Heat dissipation can also be obtained by printing the ink over the entire surface of the fabric. However, in view of the practicality in comfortable clothing applications, it is desirable that the fabric has breathability, heat absorption, and quick-drying properties. Therefore, the printed part of the surface is preferably 30 to 70% of the surface in terms of area ratio. As an efficient distribution, it is particularly preferable to arrange the printed pattern so that the area ratio is 50 to 60% of the fabric surface. As the printed pattern on the surface, a pattern that repeats ink portions and blanks, such as squares, polygons, circles, etc., can be used.

[0037] In addition, when kneading far-infrared radiation ceramic powder into the yarn, not only will it affect the strength of the yarn, etc., but it is also not easy to create a difference in the blending ratio in the depth direction of the fabric or control the surface area ratio. When kneaded into the entire yarn, as in the state of Fig. 2(b), it becomes difficult to make a change in the blending between the front and back of the fabric, and it is also difficult to create a difference like adjusting the printed area with only the kneaded yarn. Thus, when kneaded into the yarn, it becomes difficult to impart directivity to the radiation direction of the far-infrared rays. Therefore, the structure of the present invention shown in Fig. 1, in which the concentration can be adjusted by the spread of penetration by printing, is superior in heat dissipation.

[0038] (Washability) In the obtained printed product, the fine powder of far-infrared radiation ceramics is fixed to the fiber surface by an acrylic resin, so it hardly peeled off easily even after repeated washing, etc. It was confirmed that even after long-term use, since the far-infrared radiation ceramics are hardly deteriorated, the heat dissipation of the far-infrared radiation ceramic fine powder hardly deteriorates and stable performance is ensured.

[0039] (Heat dissipation) Regarding the heat dissipation of the fabric printed with the obtained far-infrared radiation ceramic-containing ink, imaging was performed using a thermography measuring device manufactured by FLIR, and the temperature was measured while visualizing it as the color temperature. The fabric used in the experiment was a partial printed fabric printed on the pattern of the fabric, not a printed fabric on the entire surface. In the measurement test, the surface of the fabric of the example was placed face up on a plate heated to 37°C, and a fabric of unprinted nylon plain weave was placed beside it as a comparative example, and the temperature change of the fabric on the plate was observed by thermography. In addition, as an implementation product of the present invention, in addition to plain weave, those printed on mesh fabric were also measured.

[0040] Fig. 3 shows the results of thermography immediately after placing on a 37°C plate and after 1 minute has elapsed. The plain weave of the implementation product of the present invention Immediately after placement: average 36.8°C, After 1 minute: average 36.9℃, 30 minutes later: average temperature was 36.9°C. On the other hand, in the unprinted comparative example bare jersey, Immediately after placement: average 36.4℃, After 1 minute: average 36.3℃, 30 minutes later: average temperature was 36.3°C.

[0041] In the case of bare jersey, it was found that products with far-infrared emitting ceramic powder printed on the surface, even when only partially printed, were 0.5 to 0.6°C warmer than unprinted products, had excellent heat dissipation properties, and were less likely to deteriorate over time, maintaining their heat dissipation properties. In addition, the mesh fabric had high heat dissipation properties, reaching 37.0°C only immediately after placement, but the ventilation effect of the mesh soon became saturated, and thereafter no difference in heat dissipation properties was observed compared to the bare jersey sample.

[0042] As described above, when a fabric with excellent heat dissipation properties is applied to clothing with the surface that comes in contact with the skin facing backwards and the printed surface facing outwards, internal body heat is efficiently radiated to the outside as far infrared rays. In addition, the infrared rays of sunlight and the radiated far infrared rays interfere with each other, resulting in heat insulation to that extent.

[0043] Regarding the heat dissipation properties when worn as clothing, the thermography of the back was measured immediately after a subject put on an inner shirt made from the fabric of the embodiment of the present invention, and then the thermography immediately after removing the shirt was compared. Immediately after wearing: Maximum 34.7℃ Minimum 31.6℃ Average 33.3℃ Immediately after undressing: Maximum 35.3℃ Minimum 31.9℃ Average 33.6℃ The temperature was an average of 0.3 degrees Celsius cooler when wearing an inner layer than when not wearing one.

[0044] (Contact warm / cold sensation test Q-max) A resin ink containing far-infrared radiation ceramic powder was printed on one surface side of the raw fabric by printing. After obtaining a printed product (fabric with surface printing) where the ink components did not reach the back surface, the contact cold and warm sensations of the front and back surfaces of the fabric with surface printing were measured using a KES-F7 Thermo Lab II type. (Test environment: temperature 20°C, humidity 65%RH, temperature difference between the temperature detector and the test piece: 20°C)

[0045] Initial contact cold sensation value [When 3 mass% of far-infrared radiation ceramic powder is blended in the ink] Front: 0.400 W / cm 2 Back: 0.342 W / cm 2 Difference between front and back: 0.058 W / cm 2 [When 5 mass% of far-infrared radiation ceramic powder is blended in the ink] Front: 0.402 W / cm 2 Back: 0.332 W / cm 2 Difference between front and back: 0.070 W / cm 2

[0046] The contact cold and warm sensation evaluation value Q-max measures the instantaneous heat transfer amount between the contacting object and the fabric. When the value is large, the heat transfer amount is large, so when the skin touches the fabric, it will feel cold. In the test shown above, the value of the back surface is the contact cold sensation on the nylon base fabric side, and the value of the front surface is the contact cold sensation of the surface printed with the far-infrared radiation substance-containing ink. Since the value of the front surface side is larger than that of the back surface, it was confirmed that the printed front surface is arranged with components having better heat dissipation properties.

[0047] And if the difference in the Q-max values between the front and back surfaces is sufficient, for example, 0.010 - 0.100 W / cm 2 If there is such a difference, it serves as a criterion for not reaching the back surface. From the measurement results shown above, the value of Q-max is 0.050 W / cm 2Even when printing with inks in the practical range where the above difference exists and far-infrared radiation ceramic powder is blended at 3% or 5% in the ink, the difference in the contact cold feeling value between the front and back surfaces is ensured to be 0.050 W / cm 2 or more, and it was confirmed that a heat dissipation fabric with a penetration depth that does not reach the back surface can be obtained.

[0048] Thus, if it is in the range of 0.050 to 0.080 W / cm 2 when the ink components are penetrated in the depth direction of the fabric by printing, the ink components remain from the surface to the middle of the fabric, and it can be said that the ink components do not reach the back surface.

[0049] Also, if 0.015 to 0.030 W / cm 2 is ensured, regardless of the thickness, it will penetrate sufficiently and reach 80 to 90% in the depth direction, so an efficient practical area can be stably ensured.

[0050] On the other hand, if the difference between the front and back surface values of the contact cold feeling value of the printed fabric is almost 0, it means that the ink components from the surface of the printed surface reach the back surface. The initial contact cold feeling values of such fabrics show high values on both the front and back surfaces, but in terms of long-term heat dissipation, since the radiant component of far-infrared rays towards the body surface increases, it becomes disadvantageous by that amount, and it is inferior to the fabric of the embodiment of the present invention where the ink components do not reach the back surface. The penetration state of the ink components in such printing can be easily confirmed by using the value of Q-max as a reference. Therefore, by using the value of Q-max as a reference and adjusting the blending and coating amount of the ink, etc., a fabric with an appropriate penetration state can be stably obtained.

[0051] The result that the contact cold feeling value on the front surface side is larger than that on the back surface means that when the heat of the body surface is transmitted from the back surface side to the front surface side, it is easily released, which is consistent with the occurrence of directivity in the depth direction of the fabric and the fact that the thermograph measurement results show that the fabric of the embodiment has better heat dissipation performance. Therefore, it was verified that the fabric of the present invention has excellent heat dissipation performance.

Explanation of Symbols

[0052] 1 The fabric of the present invention with excellent heat dissipation 2 Base fabric 3 Ink component 4 Surface 5 Back surface 6 Far-infrared radiation ceramic fine powder 7 Penetration depth

Claims

1. A fabric in which a resin ink component containing far-infrared radiation ceramic powder is infiltrated from the surface side so as not to reach the back surface, and the far-infrared radiation ceramic powder is dispersed so that there is more on the surface side of the fabric and less near the back surface, and is inclined and distributed in the depth direction, and the fabric has excellent heat dissipation properties.

2. The far-infrared radiation ceramic powder has a volume average particle size of 1 to 5 μm, and the fabric with excellent heat dissipation properties according to Claim 1 is characterized by this.

3. The far-infrared radiation ceramic powder has an emissivity of 0.70 to 0.95 at a wavelength of 4 μm to 100 μm at 40°C, and the fabric with excellent heat dissipation properties according to Claim 1 or 2 is characterized by this.

4. The far-infrared radiation ceramic powder has an emissivity of 0.70 to 0.95 at a wavelength of 4 μm to 20 μm at 40°C, and the fabric with excellent heat dissipation properties according to any one of Claims 1 to 3 is characterized by this.

5. The resin ink component contains 1 to 5% by mass of far-infrared radiation ceramic powder with respect to the water-soluble acrylic resin, and the fabric with excellent heat dissipation properties according to any one of Claims 1 to 4 is characterized by this.

6. The value of the surface contact cold feeling value - the back surface contact cold feeling value, which is the difference between the surface contact cold feeling value and the back surface contact cold feeling value, is 0.010 to 0.100 W / cm 2 The fabric excellent in heat dissipation according to any one of claims 1 to 5, characterized in that it is so.

7. A clothing with excellent heat dissipation properties using the fabric according to any one of Claims 1 to 6.

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