A blended yarn with synergistic cooling function, a fabric with synergistic cooling function, and clothing

Abstract

This invention discloses a blended yarn, a fabric, and garment with synergistic cooling function, belonging to the field of textile technology. The blended yarn is produced by Sirospunting moisture-wicking fiber slivers with radiation-cooling fiber slivers. The moisture-wicking fiber is a polyester fiber with an irregular cross-section, and the radiation-cooling fiber comprises a copolymer matrix and nanoparticles uniformly distributed within the copolymer matrix. The copolymer matrix is ​​polyvinylidene fluoride-co-hexafluoropropylene, and the nanoparticles are hydrophobic silica nanoparticles. This invention achieves a synergistic cooling effect not only through radiation cooling but also through moisture absorption and evaporation, while also exhibiting good moisture permeability, making it suitable for clothing.

Description

Technical Field

[0001] This invention belongs to the field of textile technology, specifically relating to a blended yarn with synergistic cooling function, a fabric with synergistic cooling function, and clothing. Background Technology

[0002] With global warming and the emergence of heat island effects, more and more cities and regions are experiencing a sharp rise in surface temperatures during the summer, causing great disruption to people's lives and work. At high temperatures, ordinary clothing fabrics generate heat and are unable to effectively evaporate sweat produced by the body.

[0003] CN 217997459 U discloses a radiative cooling yarn, a radiative cooling fabric, and clothing. The yarn consists of a yarn body and a radiative cooling layer covering the surface of the yarn body. The radiative cooling layer includes a polyurethane matrix and radiative cooling particles embedded in the polyurethane matrix. The radiative cooling layer has a microporous structure. The yarn combines radiative cooling effect with good breathability and moisture permeability. However, when this radiative cooling yarn is woven into fabric, the radiative cooling coating will wear down during use, causing the yarn body to be exposed, which may reduce the radiative cooling effect of the fabric to some extent. At the same time, this radiative cooling yarn does not have a moisture-wicking effect, resulting in insufficient comfort during the use of the corresponding fabric and clothing. Summary of the Invention

[0004] To address the technical contradiction between the cooling function and comfort of existing fabrics, the first objective of this invention is to provide a blended yarn with synergistic cooling function; the second objective is to provide a fabric with synergistic cooling function; and the third objective is to provide clothing with synergistic cooling function.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a blended yarn with synergistic cooling function, wherein the blended yarn is a yarn formed by twisting moisture-wicking fiber slivers and radiation-cooling fiber slivers together using Sirospun spinning. The moisture-wicking fiber is a polyester fiber with an irregular cross section, and the radiation-cooling fiber includes a copolymer matrix and nanoparticles uniformly distributed in the copolymer matrix. The copolymer matrix is ​​polyvinylidene fluoride-co-hexafluoropropylene, and the nanoparticles are hydrophobic silica nanoparticles.

[0006] Furthermore, the blending ratio of the moisture-wicking fiber to the radiant cooling fiber is 45%–50%:50%–55%.

[0007] Furthermore, the irregularly shaped cross-section polyester fiber is a cross-shaped polyester fiber.

[0008] Furthermore, the hydrophobic silica nanoparticles account for 0.75% to 1.25% of the mass percentage of the radiative cooling fiber, and the polyvinylidene fluoride-co-hexafluoropropylene accounts for 98.75% to 99.25% of the mass percentage of the radiative cooling fiber.

[0009] Furthermore, the spinning method of the radiation cooling fiber is a blending and bonding method followed by melt spinning.

[0010] A synergistic cooling functional fabric, wherein the synergistic cooling functional fabric comprises the above-mentioned blended yarn with synergistic cooling function.

[0011] A garment comprising the aforementioned synergistic cooling fabric.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0013] (1) The blended yarn with synergistic cooling function of the present invention is a yarn made by twisting A yarn, which is a moisture-wicking fiber single yarn sliver, and B yarn, which is a radiation cooling fiber single yarn sliver, together using Siro spinning. The moisture-wicking fiber is a profiled polyester fiber with an irregular cross section, and the radiation cooling fiber has a circular cross section. At the same time, a certain blending ratio is controlled. Therefore, the radiation cooling fiber single yarn sliver of B yarn is more concentrated in the entire blended yarn body, which better reflects sunlight and achieves radiation cooling effect. The moisture-wicking fiber single yarn sliver of A yarn is more concentrated in the entire blended yarn body, which better absorbs and wicks away moisture. In addition, after A yarn and B yarn are twisted together, there is a small amount of twist on A yarn and B yarn, and there is an obvious gap between the two yarn bodies, so that the yarn body has a microporous structure that improves the reflectivity of sunlight. It can not only achieve radiation cooling, but also achieve a further cooling effect through moisture absorption and evaporation.

[0014] (2) The fabrics and garments prepared by the blended yarn with the synergistic cooling function of the present invention can not only have a good synergistic cooling function, but also have the effect of moisture absorption and sweat absorption, and have the advantages of sweat wicking, coolness and comfort, making them suitable as textiles for clothing. Attached Figure Description

[0015] Figure 1 This is a schematic diagram illustrating the synergistic cooling principle of the blended yarn with synergistic cooling function of the present invention.

[0016] Figure 2 This is a schematic diagram of the longitudinal structure of the blended yarn with synergistic cooling function of the present invention;

[0017] Figure 3 This is a partial cross-sectional structural diagram of the blended yarn with synergistic cooling function of the present invention;

[0018] Among them, 1 is the blended yarn body, 2 is the moisture-wicking fiber single yarn sliver, 3 is the radiant cooling fiber single yarn sliver, a is the moisture-wicking fiber, and b is the radiant cooling fiber. Detailed Implementation

[0019] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0020] This invention provides a blended yarn with synergistic cooling function, which is made by blending moisture-wicking fibers with radiative cooling fibers. This invention also provides a fabric with synergistic cooling function, which can be woven or knitted using the blended yarn with synergistic cooling function, and has good radiative cooling effect and moisture absorption and evaporation performance.

[0021] Radiation-cooling fibers can reflect visible and infrared light from sunlight and emit heat through atmospheric windows via infrared radiation, resulting in cooling. The radiation-cooling fibers in the blended yarn of this invention comprise a copolymer matrix and nanoparticles uniformly distributed within the copolymer matrix. The copolymer matrix is ​​polyvinylidene fluoride-co-hexafluoropropylene (P(VDF-HFP)), and the nanoparticles are hydrophobic silica (SiO2) nanoparticles. Therefore, the radiation-cooling fiber is a P(VDF-HFP) / hydrophobic SiO2 composite fiber. Figure 1 As shown, sunlight shines on the blended yarn with its full spectrum, and then on the surface of the P(VDF-HFP) / hydrophobic SiO2 composite fiber. The P(VDF-HFP) / hydrophobic SiO2 composite fiber can reflect part of the sunlight, including visible light and infrared light, and emit heat by emitting mid-infrared light through the atmospheric window in the 8μm to 13μm band, thereby achieving a radiative cooling effect.

[0022] Moisture-wicking fibers possess moisture-absorbing and evaporative cooling properties. Moisture-absorbing and evaporative cooling refers to the moisture-wicking process, which includes both absorption and release. The absorption process involves the fiber absorbing gaseous water evaporated from the human skin. The release process involves the capillary effect generated by the capillaries, micropores, grooves, and gaps between fibers, causing moisture to be adsorbed, diffused, and evaporated within and on the surface of the fiber material. Preferably, the moisture-wicking fibers in the blended yarn of this invention are cross-shaped polyester fibers, such as... Figure 1As shown, the cross-shaped polyester fiber absorbs the gaseous water vapor evaporated from human skin. Then, through the capillary effect generated by the capillaries, micropores, grooves, and gaps between the fibers within the cross-shaped polyester fiber, the water is adsorbed, diffused, and evaporated both inside and on the surface of the fiber material. Since the evaporation of water absorbs a certain amount of heat, a cooling effect is achieved.

[0023] The blended yarn of this invention is made of polyester fiber with irregular cross-section and P(VDF-HFP) / hydrophobic SiO2 composite fiber. It can achieve further cooling not only through radiation but also through moisture absorption and evaporation. The synergistic cooling principle is illustrated below. Figure 1 As shown. The synergistic cooling fabrics and garments prepared using the blended yarns of this invention not only have good synergistic cooling function, but also have moisture-wicking and sweat-absorbing effects, with the advantages of perspiration wicking, coolness, and comfort, making them suitable as textiles for clothing.

[0024] To further enhance the synergistic cooling effect of blended yarns, the blended yarn is produced by Sirospunting, which involves twisting moisture-wicking fiber slivers with radiation-cooling fiber slivers. Sirospunting involves feeding two rovings with a certain distance between them onto a spinning frame. After drafting, two single-yarn slivers, A and B, are output from the front roller. Due to the transmission of twist, the single-yarn slivers carry a small amount of twist. After being combined, they are further twisted into a yarn similar to a ply. The Sirospun AB yarn of this invention, wherein yarn A is a moisture-wicking fiber sliver and yarn B is a radiation-cooling fiber sliver, results in a blended yarn with advantages such as good evenness, high strength, and low hairiness. The structure of the blended yarn is as follows... Figure 2 and Figure 3 As shown, the blended yarn 1 with synergistic cooling function of the present invention is made by Siro-spun yarn of moisture-wicking fiber single yarn sliver 2 and radiation-cooling fiber single yarn sliver 3. The moisture-wicking fiber a is a polyester fiber with an irregular cross section. Preferably, the fiber cross section is cross-shaped. The radiation-cooling fiber b is made by screw extrusion spinning of a P(VDF-HFP) copolymer matrix and hydrophobic SiO2 nanoparticles uniformly distributed in the P(VDF-HFP) copolymer matrix, with a circular cross section. The two fibers with different cross sections, cross-shaped and circular, are output as two single yarn slivers through the front roller. The two single yarn slivers are further twisted and plyed. Due to the different fiber cross sections and small twist of the two single yarn slivers, there is a significant gap between the two single yarn slivers. Therefore, the Siro-spun blended yarn has a microporous structure inside. The microporous structure can improve the reflectivity of sunlight, thereby achieving a cooling effect.

[0025] The blending ratio of moisture-wicking fibers to radiative cooling fibers in blended yarns has a certain impact on the overall radiative cooling and moisture-wicking effects of the material. In this invention, the blending ratio of moisture-wicking fibers to radiative cooling fibers is 45%–50%:50%–55%, that is, the blending ratio of profiled cross-section polyester fibers to P(VDF-HFP) / hydrophobic SiO2 composite fibers is 45%–50%:50%–55%. If the proportion of P(VDF-HFP) / hydrophobic SiO2 composite fibers in the blended yarn is too high, the radiative cooling effect is relatively good, but the microporous structure inside the blended yarn is less, which affects the fabric's moisture permeability, resulting in poor fabric comfort. Conversely, if the proportion of profiled cross-section polyester fibers in the blended yarn is too high, although the microporous structure inside the blended yarn is relatively increased, resulting in better moisture-wicking, cooling, and moisture permeability, the radiative cooling effect will be affected.

[0026] Because the vibrational absorption peaks of the Si-O-Si bonds in SiO2 coincide with the atmospheric window wavelength, it can enhance the mid-infrared emissivity. Therefore, the mass percentage of SiO2 nanoparticles in the radiation-cooling fiber affects the radiation-cooling effect. Excessive hydrophobic SiO2 nanoparticles tend to agglomerate during spinning. Preferably, the hydrophobic SiO2 nanoparticles constitute 0.75% to 1.25% of the radiation-cooling fiber, and the polyvinylidene fluoride-hexafluoropropylene constitutes 98.75% to 99.25% of the radiation-cooling fiber, ensuring the radiation-cooling effect of the P(VDF-HFP) / hydrophobic SiO2 composite fiber and providing a stable and high solar reflectivity.

[0027] In order to further ensure the uniform dispersion of hydrophobic SiO2 nanoparticles in the P(VDF-HFP) copolymer, the spinning method of the radiation cooling fiber of the present invention is blending-bonding-melt spinning. The blending-coating-melt spinning method includes the following steps: S1, using the high shear force provided by an ultra-high-speed mixer to break up the hydrophobic SiO2 nanoparticle agglomerates, allowing the surface treatment agent to more effectively treat the nanoparticles locally, effectively reducing surface energy and preventing the hydrophobic SiO2 nanoparticles from re-agglomerating; S2, adding P(VDF-HFP) copolymer granules, the friction between granules and between granules and the container wall generates heat, and the external heating of the instrument causes the P(VDF-HFP) copolymer to quickly enter a softened state, with strong surface adhesion. The viscous drag force and high shear force enable the hydrophobic SiO2 nanoparticles to uniformly coat the P(VDF-HFP) copolymer granules; S3, the P(VDF-HFP) copolymer matrix obtained in step S2 and the hydrophobic SiO2 nanoparticles uniformly distributed in the P(VDF-HFP) copolymer matrix are extruded and spun by a screw to obtain P(VDF-HFP) / hydrophobic SiO2 composite fibers. The uniform dispersion of hydrophobic SiO2 nanoparticles can make the radiation cooling effect of the radiation cooling fiber of the present invention more uniform, and thus make the radiation cooling effect of the blended yarn products more uniform and stable. In addition, the more uniformly the hydrophobic SiO2 nanoparticles are dispersed, the smoother and flatter the surface of the radiation cooling fiber of the present invention will be, and thus make the surface of the blended yarn with synergistic cooling function smoother, which is conducive to improving the reflectivity of sunlight and making the cooling effect of the fabric better.

[0028] Example 1

[0029] A blended yarn with synergistic cooling function, such as Figure 2 and Figure 3 As shown, the blended yarn 1 is a yarn formed by twisting moisture-wicking fiber slivers 2 and radiation-cooling fiber slivers 3 together using Sirospun spinning. The moisture-wicking fiber a is a cross-shaped polyester fiber, and the radiation-cooling fiber b includes a copolymer matrix and nanoparticles uniformly distributed in the copolymer matrix. The copolymer matrix is ​​polyvinylidene fluoride-co-hexafluoropropylene, and the nanoparticles are hydrophobic SiO2 nanoparticles. The blended yarn is formed by twisting moisture-wicking fiber slivers and radiation-cooling fiber slivers together using Sirospun spinning. The blending ratio of the moisture-wicking fiber to the radiation-cooling fiber is 45%:55%. The hydrophobic SiO2 nanoparticles account for 1% of the mass percentage of the radiation-cooling fiber, and the polyvinylidene fluoride-co-hexafluoropropylene accounts for 99% of the mass percentage of the radiation-cooling fiber. The spinning method of the radiation-cooling fiber is a blending-bonding method followed by melt spinning.

[0030] Radiation cooling fabrics made from blended yarns with the aforementioned synergistic cooling function and garments made from such fabrics have the effects of wicking away sweat, cooling, and comfort.

[0031] Example 2

[0032] A blended yarn with synergistic cooling function, such as Figure 2 and Figure 3 As shown, the blended yarn 1 is a yarn formed by twisting moisture-wicking fiber slivers 2 and radiation-cooling fiber slivers 3 together using Sirospun spinning. The moisture-wicking fiber a is a cross-shaped polyester fiber, and the radiation-cooling fiber b includes a copolymer matrix and nanoparticles uniformly distributed in the copolymer matrix. The copolymer matrix is ​​polyvinylidene fluoride-co-hexafluoropropylene, and the nanoparticles are hydrophobic SiO2 nanoparticles. The blended yarn is formed by twisting moisture-wicking fiber slivers and radiation-cooling fiber slivers together using Sirospun spinning. The blending ratio of the moisture-wicking fiber to the radiation-cooling fiber is 50%:50%. The hydrophobic SiO2 nanoparticles account for 0.75% of the mass of the radiation-cooling fiber, and the polyvinylidene fluoride-co-hexafluoropropylene accounts for 99.25% of the mass of the radiation-cooling fiber. The radiation-cooling fiber is spun using a blending-bonding method followed by melt spinning.

[0033] Radiation cooling fabrics made from blended yarns with the aforementioned synergistic cooling function and garments made from such fabrics have the effects of wicking away sweat, cooling, and comfort.

[0034] Example 3

[0035] A blended yarn with synergistic cooling function, such as Figure 2 and Figure 3 As shown, the blended yarn 1 is a yarn formed by twisting moisture-wicking fiber slivers 2 and radiation-cooling fiber slivers 3 together using Sirospun spinning. The moisture-wicking fiber a is a cross-shaped polyester fiber, and the radiation-cooling fiber b includes a copolymer matrix and nanoparticles uniformly distributed in the copolymer matrix. The copolymer matrix is ​​polyvinylidene fluoride-co-hexafluoropropylene, and the nanoparticles are hydrophobic SiO2 nanoparticles. The blended yarn is formed by twisting moisture-wicking fiber slivers and radiation-cooling fiber slivers together using Sirospun spinning. The blending ratio of the moisture-wicking fiber to the radiation-cooling fiber is 45%:55%. The hydrophobic SiO2 nanoparticles account for 1.25% of the mass of the radiation-cooling fiber, and the polyvinylidene fluoride-co-hexafluoropropylene accounts for 98.75% of the mass of the radiation-cooling fiber. The radiation-cooling fiber is spun using a blending-bonding method followed by melt spinning.

[0036] Radiation cooling fabrics made from blended yarns with the aforementioned synergistic cooling function and garments made from such fabrics have the effects of wicking away sweat, cooling, and comfort.

[0037] Comparative Example 1

[0038] The difference from Example 1 is that the hydrophobic SiO2 nanoparticles account for 0% of the mass percentage of the radiation cooling fiber.

[0039] Comparative Example 2

[0040] The difference from Example 1 is that the hydrophobic SiO2 nanoparticles account for 2% of the mass of the radiative cooling fiber.

[0041] Comparative Example 3

[0042] The difference from Example 1 is that the moisture-wicking fiber is replaced with ordinary polyester fiber.

[0043] Comparative Example 4

[0044] The difference from Example 1 is that the blending ratio of moisture-wicking fibers to radiant cooling fibers is 40%:60%.

[0045] Comparative Example 5

[0046] The difference from Example 1 is that the blending ratio of moisture-wicking fibers to radiant cooling fibers is 55%:45%.

[0047] Comparative Example 6

[0048] The difference from Example 1 is that the blended yarn is spun by ring spinning.

[0049] The synergistic cooling functional fabrics in Examples 1-3 and Comparative Examples 1-6 were tested for radiative cooling performance and moisture permeability. The results are shown in Table 1. The testing conditions for radiative cooling performance and moisture permeability were: ambient temperature 30℃, convective heat transfer coefficient 10W / m2*K, atmospheric mass AM1.6, and atmospheric pressure 100Pa. The radiative cooling performance was tested using outdoor daytime cooling tests, ultraviolet-visible spectroscopy, and infrared reflectance testing of the samples using a Fourier transform infrared spectrometer with an integrating sphere attachment. The test indicators were solar reflectance, visible light reflectance, and infrared light reflectance; the higher the value, the better the effect. The moisture permeability was tested using the standard test method for water vapor permeability of materials. The test indicator was the moisture permeability value; the higher the moisture permeability value, the better the moisture permeability and the better the thermal comfort of the fabric.

[0050] Table 1

[0051]

[0052] As shown in Table 1, the fabrics in Examples 1-3 are woven from blended yarns with synergistic cooling function, resulting in better radiative cooling effect and moisture absorption and evaporative cooling performance.

[0053] Compared to Example 1, Comparative Example 1 exhibits poorer radiative cooling and moisture permeability. Its more pronounced radiative cooling effect is attributed to the absence of hydrophobic SiO2 nanoparticles in the radiative cooling fiber; it is a blend of polyvinylidene fluoride-co-hexafluoropropylene fiber and cross-shaped polyester fiber. Since the vibrational absorption peak of the Si-O-Si bonds in SiO2 coincides with the atmospheric window wavelength, the addition of SiO2 can enhance the fabric's emissivity at the atmospheric window of 8μm to 13μm. Therefore, the percentage of SiO2 nanoparticles in the radiative cooling fiber's mass affects the radiative cooling effect. Because Comparative Example 1 lacks hydrophobic SiO2 nanoparticles, its radiative cooling fiber does not provide the radiative cooling effect offered by these nanoparticles. Furthermore, the absence of nanoparticles within the radiative cooling fiber results in a relatively smooth fiber surface, potentially reducing the porosity of the blended yarn. Consequently, the overall radiative cooling effect and moisture permeability of the fabric woven from the blended yarn of Comparative Example 1 are inferior.

[0054] Compared with Example 1, Comparative Example 2 has poorer radiative cooling effect and moisture permeability. The radiative cooling effect is more obvious because too much hydrophobic SiO2 nanoparticles were added to the radiative cooling fiber. Adding too much hydrophobic SiO2 nanoparticles will not only make the radiative cooling fiber unevenly dispersed during the spinning process, which may result in uneven local radiative cooling effect and reduced overall radiative cooling effect, but may also lead to a deterioration in the mechanical properties of the spun radiative cooling fiber.

[0055] Compared with Example 1, Comparative Example 3 showed poorer radiative cooling effect and moisture permeability, with the moisture permeability being more pronounced. Due to the use of ordinary cross-section polyester fibers, the fabric of Comparative Example 3 had fewer pores, resulting in a poorer capillary effect. Moisture could not be adsorbed, diffused, or evaporated inside and on the surface of the fabric, thus the moisture permeability value of Comparative Example 3 decreased significantly. In addition, the blending of ordinary cross-section polyester fibers with radiative cooling fibers resulted in a slight decrease in solar reflectance, visible light reflectance, and infrared light reflectance. This may be because the fabric lacks a microporous structure, affecting the reflection of sunlight. At the same time, the temperature difference between the fabric and the environment also decreased slightly after 1 hour of sunlight exposure, resulting in a slightly worse cooling effect. This may be due to the lack of the synergistic effect of moisture absorption and evaporation cooling from cross-shaped polyester fibers.

[0056] Compared with Example 1, Comparative Example 4 has poorer moisture permeability. This is because the amount of cross-shaped polyester fiber used is reduced, which reduces the moisture permeability of the blended yarn and the fabric woven from it. At the same time, the reduced amount of cross-shaped polyester fiber will reduce the internal porosity of the blended yarn, which may reduce its moisture absorption, evaporation and cooling effect to a certain extent, resulting in a slight decrease in the temperature difference between the fabric and the environment after 1 hour of sunlight.

[0057] Compared with Example 1, Comparative Example 5 had a poorer radiative cooling effect because the amount of radiative cooling fiber used was reduced, which made the radiative cooling effect of the blended yarn and the fabric woven from it worse.

[0058] Compared with Example 1, Comparative Example 6 has slightly worse radiative cooling effect and moisture permeability. The ring spinning method makes the two different cross-section fibers more randomly distributed inside the yarn, resulting in good yarn uniformity and better tactile comfort. However, the yarn has fewer micropores. In other words, ring spinning reduces the number of micropores between the cross-shaped polyester fiber and the P(VDF-HFP) / hydrophobic SiO2 composite fiber, and the micropores also become smaller. This leads to a decrease in radiative cooling effect and a decrease in moisture permeability.

Claims

1. A blended yarn with synergistic cooling function, characterized in that, The blended yarn is made by twisting moisture-wicking fiber slivers and radiation-cooling fiber slivers together using Sirospun spinning. The moisture-wicking fiber is a polyester fiber with an irregular cross section. The radiation-cooling fiber includes a copolymer matrix and nanoparticles uniformly distributed in the copolymer matrix. The copolymer matrix is ​​polyvinylidene fluoride-co-hexafluoropropylene, and the nanoparticles are hydrophobic silica nanoparticles.

2. The blended yarn according to claim 1, characterized in that, The blending ratio of the moisture-wicking fiber to the radiant cooling fiber is 45%–50%: 50%–55%.

3. The blended yarn according to claim 1, characterized in that, The irregularly shaped polyester fiber is a cross-shaped polyester fiber.

4. The blended yarn according to claim 1, characterized in that, The hydrophobic silica nanoparticles account for 0.75% to 1.25% of the mass of the radiative cooling fiber, and the polyvinylidene fluoride-co-hexafluoropropylene accounts for 98.75% to 99.25% of the mass of the radiative cooling fiber.

5. The blended yarn according to claim 1, characterized in that, The spinning method of the radiation cooling fiber is blending and bonding method - melt spinning method.

6. A synergistic cooling fabric, characterized in that, The synergistic cooling fabric includes the blended yarn with synergistic cooling function as described in any one of claims 1 to 5.

7. A garment, characterized in that, The garment includes the synergistic cooling fabric as described in claim 6.

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