Radiation evaporation integrated refrigeration fabric

Abstract

The utility model provides radiation and evaporation integrated refrigeration fabric, and belongs to the field of radiation refrigeration materials. The radiation and evaporation integrated refrigeration fabric comprises a hydrophobic layer, a transfer layer, an evaporation layer and a radiation refrigeration layer with the hydrophobic property. The four layers are prepared layer by layer through an electrostatic spinning technology and are stacked layer by layer. The hydrophobic layer, the transfer layer and the evaporation layer have the hygroscopic gradient from hydrophobic to hydrophilic and the diameter gradient from large to small of the fiber diameter. Sweat is prevented from reaching the outer surface of the fabric through the hydrophobic radiation refrigeration layer on the top layer, and the problem that the radiation refrigeration effect is reduced due to the fact that the sweat is gathered on the surface of the fabric and strongly absorbs sunlight in the near-infrared band is solved. Sweat generated on the skin side can be quickly transferred from the hydrophobic layer and transferred to the evaporation layer for evaporation under the action of pressure difference, so that the sweat evaporation rate is increased while the sticky feeling of the sweat on the skin side is avoided. Effective human body cooling is achieved through the combined action of radiation refrigeration and evaporation refrigeration.

Description

Technical Field

[0001] This utility model relates to the field of radiation cooling materials technology, specifically to a radiation evaporation integrated cooling fabric. Background Technology

[0002] With global warming, the demand for cooling in outdoor environments increases dramatically during summer. Thermal radiation accounts for the majority of human heat dissipation; therefore, zero-energy radiative cooling technology based on personal thermal management is the most promising way to achieve human thermal comfort. Radiative cooling fabrics, through material selection and structural design, achieve high reflectivity in the solar radiation band (0.3-2.5μm) to block solar heat input, while simultaneously achieving high emissivity in the human body radiation band (7-14μm), allowing body heat to radiate into outer space through the mid-infrared atmospheric window (8-13μm) for cooling.

[0003] Patent CN113136724A discloses a radiative cooling fabric that attaches a high-refractive-index material to filamentous fibers, achieving a temperature reduction of approximately 3.6°C below ambient temperature under sunlight. Existing radiative cooling fabrics can achieve excellent cooling effects when the human body does not produce sweat. However, when the ambient temperature exceeds 30°C, sweat evaporation and heat radiation account for the majority of heat loss from the human body. Therefore, it is necessary to design cooling fabrics that simultaneously manage both heat radiation and sweat evaporation to achieve effective body cooling. Currently, the bottleneck in simultaneously achieving effective radiative cooling and sweat evaporation cooling for body cooling lies in the fact that when sweat accumulates on the fabric surface, the high absorption of near-infrared sunlight by water significantly reduces the reflectivity of sunlight, thus decreasing the cooling performance of radiative cooling.

[0004] In view of this, it is necessary to design a radiation evaporation integrated cooling fabric to solve the above problems. Utility Model Content

[0005] In view of the technical problems existing in the background art, this application provides a radiation evaporation integrated cooling fabric, which includes a hydrophobic layer, a transfer layer, an evaporation layer, and a hydrophobic radiation cooling layer stacked from bottom to top. The top hydrophobic radiation cooling layer prevents sweat from reaching the outer surface of the fabric, solving the problem of sweat accumulating on the fabric surface and strongly absorbing near-infrared sunlight, thus reducing the radiation cooling effect. The hydrophobic layer, transfer layer, and evaporation layer form a hygroscopic gradient from hydrophobic to hydrophilic and a fiber diameter gradient from large to small. Through the action of pressure difference, sweat generated on the skin side can be quickly transferred from the hydrophobic layer and conducted to the evaporation layer for evaporation, avoiding the sticky feeling of sweat on the skin side while accelerating the sweat evaporation rate. Effective body cooling is achieved by combining radiation cooling and evaporation cooling.

[0006] This application provides a radiation evaporation integrated cooling fabric, comprising a hydrophobic layer, a transfer layer, an evaporation layer, and a radiation cooling layer with hydrophobic properties stacked from bottom to top; all four layers are electrospun films; the hydrophobic layer, transfer layer, and evaporation layer form a hygroscopic gradient from hydrophobic to hydrophilic; the fiber diameter of the hydrophobic layer is larger than the fiber diameter of the transfer layer, and the fiber diameter of the transfer layer is larger than the fiber diameter of the evaporation layer.

[0007] Furthermore, the radiation cooling layer is a white polymer electrospun film with hydrophobic properties; the polymer of the radiation cooling layer is one or a mixture of several of polymethyl methacrylate, polylactic acid, polytetrafluoroethylene, and polyvinylidene fluoride.

[0008] Furthermore, the fiber diameter of the hydrophobic layer is 1μm-3μm, the fiber diameter of the transfer layer is 400-800nm, and the fiber diameter of the evaporation layer is 100-300nm.

[0009] Furthermore, the polymer of the hydrophobic layer is one or a mixture of two of polyurethane and polylactic acid.

[0010] Furthermore, the polymer of the evaporation layer is one or a mixture of two of polyacrylonitrile and polyamide.

[0011] Furthermore, the contact angle of the hydrophobic layer is greater than 90°, the contact angle of the transfer layer becomes 0 within 50s-150s, and the contact angle of the evaporation layer becomes 0 within 0s-2s.

[0012] Furthermore, the thickness of the hydrophobic layer is 10-20 μm, the thickness of the transfer layer is 40-60 μm, the thickness of the evaporation layer is 80-100 μm, and the thickness of the radiation cooling layer is 400-500 μm.

[0013] Furthermore, the fiber diameter of the radiation cooling layer is 400-700 nm.

[0014] The aforementioned method for preparing the integrated radiation evaporation cooling fabric includes the following steps: preparing, sequentially using electrospinning technology, a hydrophobic layer, a transfer layer, an evaporation layer, and a radiation cooling layer with hydrophobic properties, stacked layer by layer; the polymer of the radiation cooling layer is one or a mixture of several of polymethyl methacrylate, polylactic acid, polytetrafluoroethylene, and polyvinylidene fluoride; the polymer of the hydrophobic layer is one or a mixture of two of polyurethane and polylactic acid; the polymer of the evaporation layer is one or a mixture of two of polyacrylonitrile and polyamide; the material of the transfer layer is a mixture of the materials selected from the hydrophobic layer and the evaporation layer; the hydrophobic layer, transfer layer, and evaporation layer form a hygroscopic gradient from hydrophobic to hydrophilic and a diameter gradient from large to small fiber diameter. The fiber diameter of each layer is controlled by adjusting the solution concentration, voltage, and spinning speed used in electrospinning.

[0015] The beneficial effects of this utility model are:

[0016] 1. The radiation-evaporative integrated cooling fabric provided by this utility model adopts a multi-layer design. The top layer, a hydrophobic radiation-cooling layer, prevents sweat from reaching the outer surface of the fabric, solving the problem of sweat accumulating on the fabric surface and strongly absorbing near-infrared sunlight, thus reducing the radiation-cooling effect. Composed of a hydrophobic layer, a transfer layer, and an evaporation layer, it features a hygroscopic gradient from hydrophobic to hydrophilic and a diameter gradient from large to small. Through pressure difference, sweat generated on the skin side can be quickly transferred from the hydrophobic layer and conducted to the evaporation layer for evaporation, avoiding the sticky feeling of sweat on the skin side while accelerating the sweat evaporation rate. Effective body cooling is achieved through the combined action of radiation-cooling and evaporative cooling.

[0017] 2. This invention achieves unidirectional moisture conduction of sweat and accelerates the evaporation rate through the gradient of hygroscopicity, thereby improving the evaporative cooling effect of sweat. At the same time, the outermost hydrophobic radiation cooling layer ensures high solar reflectivity when wet with sweat, thus achieving a radiation cooling effect.

[0018] 3. The electrospinning technology used in this invention has a simple preparation method, a novel structure, is easy to manufacture and apply on a large scale, and has significant economic value.

[0019] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of this application, the accompanying drawings used in this application will be briefly described below. Obviously, the drawings described below are merely some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without any creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of the radiation evaporation integrated cooling fabric of this utility model.

[0022] Figure 2 The solar reflectance of the radiation evaporation integrated cooling fabric prepared in Example 1 under dry and wet conditions.

[0023] Figure 3 The mid-infrared emissivity of the radiation evaporation integrated cooling fabric prepared in Example 1 under dry and wet conditions.

[0024] Figure 4 A comparison of the temperatures of cellulose acetate membrane, radiation evaporation integrated cooling fabric prepared in Example 1, and cotton under direct sunlight.

[0025] Figure 5 Comparison of simulated skin surface temperatures under direct sunlight with cellulose acetate membrane, radiation evaporation integrated cooling fabric prepared in Example 1, and cotton covering. Detailed Implementation

[0026] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0028] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0029] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0030] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0031] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0032] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0033] Please see Figure 1 As shown in the illustration, this application provides a radiation evaporation integrated cooling fabric, comprising a hydrophobic layer, a transfer layer, an evaporation layer, and a radiation cooling layer with hydrophobic properties stacked from bottom to top; the aforementioned four layers are prepared layer by layer and stacked layer by layer using electrospinning technology. The hydrophobic layer, transfer layer, and evaporation layer form a hygroscopic gradient from hydrophobic to hydrophilic and a diameter gradient from large to small fiber diameter.

[0034] The top radiation cooling layer is a white polymer electrospun film with hydrophobic properties.

[0035] The polymer of the radiation cooling layer can be one or a mixture of several of polymethyl methacrylate (PMMA), polylactic acid (PLA), polytetrafluoroethylene (PTFE), and polyvinylidene fluoride (PVDF).

[0036] The thickness of this layer is 400-500μm, and the fiber diameter is 400-700nm.

[0037] The hydrophobic layer is a polymer of polyurethane (PU) and polylactic acid (PLA), or a mixture of both. The fiber diameter of this layer is 1μm-3μm, and the thickness is 10-20μm.

[0038] The polymer of the evaporation layer is one or a mixture of polyacrylonitrile (PAN) and polyamide (PA). The fiber diameter of this layer is 100-300 nm, and the thickness is 80-100 μm.

[0039] The polymer selected for the transfer layer is a mixture of polymers used in both the hydrophobic layer and the evaporation layer. The hydrophobic layer comprises 5%-30% of the polymer.

[0040] The fiber diameter of the transfer layer is 400-800 nm and the thickness is 40-60 μm.

[0041] The contact angle of the hydrophobic layer is greater than 90°, the contact angle of the transfer layer becomes 0 within 50s-150s, and the contact angle of the evaporation layer becomes 0 within 0s-2s. That is, the hydrophobic layer, transfer layer, and evaporation layer form a hygroscopic gradient from hydrophobic to hydrophilic.

[0042] The aforementioned method for preparing the integrated radiation evaporation cooling fabric includes the following steps: preparing, sequentially using electrospinning technology, a hydrophobic layer, a transfer layer, an evaporation layer, and a radiation cooling layer with hydrophobic properties; the polymer of the radiation cooling layer is one or a mixture of several of polymethyl methacrylate, polylactic acid, polytetrafluoroethylene, and polyvinylidene fluoride; the polymer of the hydrophobic layer is one or a mixture of two of polyurethane and polylactic acid; the polymer of the evaporation layer is one or a mixture of two of polyacrylonitrile and polyamide; the material of the transfer layer is a mixture of the materials selected for the hydrophobic layer and the evaporation layer; the hydrophobic layer, transfer layer, and evaporation layer form a hygroscopic gradient from hydrophobic to hydrophilic and a diameter gradient from large to small. The fiber diameter of each layer is controlled by adjusting the solution concentration, voltage, and spinning speed used in electrospinning.

[0043] This invention provides a multi-layered radiation-evaporative cooling fabric. The top layer, a hydrophobic radiation-cooling layer, prevents sweat from reaching the outer surface of the fabric, solving the problem of sweat accumulation on the fabric surface leading to strong absorption of near-infrared sunlight and consequently reduced radiation-cooling efficiency. The fabric consists of a hydrophobic layer, a transfer layer, and an evaporation layer, exhibiting a hygroscopic gradient from hydrophobic to hydrophilic and a diameter gradient from large to small. Through pressure difference, sweat generated on the skin side is rapidly transferred from the hydrophobic layer and conducted to the evaporation layer for evaporation, avoiding the sticky feeling of sweat on the skin while accelerating the sweat evaporation rate. By combining radiation-cooling and evaporative cooling, effective body cooling is achieved.

[0044] This invention achieves unidirectional moisture conduction of sweat and accelerates the evaporation rate through a gradient of hygroscopicity, thereby improving the cooling effect of sweat evaporation. At the same time, the outermost hydrophobic radiation cooling layer ensures high solar reflectivity when wet with sweat, thus achieving a radiation cooling effect.

[0045] The following are some specific embodiments. It should be noted that the embodiments described below are exemplary and are only used to explain this application, and should not be construed as limiting this application. Where specific techniques or conditions are not specified in the embodiments, they shall be performed in accordance with the techniques or conditions described in the literature in this field or according to the product instructions. Reagents or instruments whose manufacturers are not specified are all conventional products that can be obtained commercially.

[0046] Example 1

[0047] Please see Figure 1 As shown, this embodiment provides a radiation evaporation integrated cooling fabric, which includes a hydrophobic layer, a transfer layer, an evaporation layer and a radiation cooling layer with hydrophobic properties stacked from bottom to top.

[0048] The materials used for each layer are as follows: the radiation cooling layer is hydrophobic polyvinylidene fluoride, the evaporation layer is polyacrylonitrile, the hydrophobic layer is polyurethane, and the transfer layer is a mixture of 70% polyacrylonitrile and 30% polyurethane. Each layer is stacked layer by layer using electrospinning technology to prepare a radiation evaporation integrated cooling fabric.

[0049] The fabric exhibits a wetting gradient from hydrophobic to hydrophilic from the hydrophobic layer to the evaporation layer, as well as a diameter gradient from large to small fiber diameter. Specifically, the contact angle of the hydrophobic layer is 105°, the contact angle of the transfer layer becomes 0 within 130s, and the contact angle of the evaporation layer becomes 0 within 2.5s.

[0050] The fiber diameters of the hydrophobic layer, transfer layer, and evaporation layer are 245 nm, 500 nm, and 1.1 μm, respectively. This configuration enables unidirectional moisture conduction from the hydrophobic layer to the evaporation layer, accelerating the sweat evaporation rate.

[0051] The preparation method of this radiation-evaporation integrated cooling fabric includes the following steps: selecting materials for each layer, and sequentially preparing a hydrophobic layer, a transfer layer, an evaporation layer, and a radiation-cooling layer with hydrophobic properties using electrospinning technology. The hydrophobic layer, transfer layer, and evaporation layer form a hygroscopic gradient from hydrophobic to hydrophilic and a fiber diameter gradient from large to small. The fiber diameter of each layer is controlled by adjusting the concentration of the solution, voltage, and spinning speed used in the electrospinning process. Specific control methods can be set according to actual conditions and will not be elaborated here.

[0052] Performance testing:

[0053] The reflectance of the radiation-evaporated integrated cooling fabric of Example 1 in the solar radiation band was tested using a UV-vis-NIR spectrophotometer (UV3600, Shimadzu) equipped with an integrating sphere (ISR-310) model. Figure 2 The results are from the test.

[0054] The infrared emissivity of the radiation-evaporation integrated cooling fabric in Example 1 was tested using a Fourier transform infrared spectrometer (Nicolet IS50, ThermoFisher) and an integrating sphere (SP-GPS-020-SL, Pike). Figure 3 The results are from the test.

[0055] For comparison, commercial cotton fabric (ROMON's pure cotton short-sleeved shirt) and radiation-cooled cellulose acetate electrospun film were selected as comparison samples.

[0056] The method for preparing the radiation-cooled fabric cellulose acetate electrospun film is as follows: the electrospinning process is adopted, and the spinning solution is cellulose acetate powder (mass fraction of 17%) dissolved in acetone / dimethylformamide.

[0057] The temperature of cellulose acetate membrane, radiation evaporation integrated cooling fabric, and cotton were tested under direct sunlight. Figure 4 The results are from the test.

[0058] The testing process involves using thermocouples to detect temperature changes beneath the cellulose acetate membrane, the radiation-evaporated integrated cooling fabric, and the cotton.

[0059] The instrument used was a K-type Omega thermocouple.

[0060] The test measured the simulated skin surface temperature under direct sunlight, covered by a cellulose acetate membrane, a radiation-evaporation integrated cooling fabric, and cotton. Figure 5 The results are from the test.

[0061] The testing process is as follows: using a power supply at 250W / m 2 The power is used to power the heating element, the sample to be tested is placed on the heating element, and the temperature change under the three fabrics is detected by thermocouples.

[0062] The instruments used were K-type, Omega thermocouples, Kapton heating elements, and Array power supplies.

[0063] Test Result Analysis:

[0064] from Figure 2It can be seen that this radiation-evaporative cooling fabric can achieve a solar reflectance of 97% in a dry state. Furthermore, thanks to the hydrophobic radiation-cooling layer, it can still maintain a solar reflectance of 93.4% even when wet with sweat, thus preventing the input of solar heat.

[0065] from Figure 3 It can be seen that the radiation evaporation integrated cooling fabric can achieve a high emissivity of more than 90% in the mid-infrared 8-13μm band, whether wet with sweat or not, thus achieving a radiation cooling effect.

[0066] from Figure 4 It can be seen that, under wet conditions, the temperature of commercial fabric cotton and cellulose acetate membrane is higher than the ambient temperature due to the decrease in solar reflectivity, and thus no net cooling power output is achieved.

[0067] The radiation evaporation integrated cooling fabric of Example 1, when wet with sweat, can achieve a cooling capacity of 925 W / m² at noon. -2 Under solar irradiation, it achieves a sub-environmental cooling effect of approximately 6.7°C below the ambient temperature (27.2°C). That is, even in a wetted state, this radiation-evaporative integrated cooling fabric still possesses the spectral properties capable of achieving radiation cooling.

[0068] from Figure 5 It can be seen that when the heating element is at 250W m -2 The heating power simulates skin heating and is measured at 32 mL / min. -1 m -2 When sweating occurs at a rate of 6°C, the simulated skin surface covered by the radiation evaporation integrated cooling fabric of Example 1 can achieve a temperature reduction of 6.4°C compared to conventional radiation cooling fabric cellulose acetate membrane, and a temperature reduction of approximately 8.1°C compared to commercial cotton fabric.

[0069] It should be noted that the polymer of the radiation cooling layer can also be one or a mixture of polymethyl methacrylate, polylactic acid, and polytetrafluoroethylene.

[0070] The polymer of the hydrophobic layer can also be polylactic acid, or a mixture of polyurethane and polylactic acid.

[0071] The polymer of the evaporation layer can also be polyamide, or a mixture of polyacrylonitrile and polyamide.

[0072] Comparative Example 1

[0073] Comparative Example 1 provides a fabric that differs from Example 1 in that it does not have a transfer layer, but is otherwise largely the same as Example 1 and will not be described again here.

[0074] Comparative Example 2

[0075] Comparative Example 1 provides a fabric that differs from Example 1 in that it does not have a radiation cooling layer with hydrophobic properties. Otherwise, it is largely the same as Example 1 and will not be described again here.

[0076] Comparative Example 3

[0077] Comparative Example 1 provides a fabric that differs from Example 1 in that the fiber diameters of the hydrophobic layer, transfer layer, and evaporation layer are the same, all being 500 nm. The rest is roughly the same as Example 1 and will not be described again here.

[0078] The fabrics prepared in Example 1 and Comparative Examples 1-3 were tested for unidirectional moisture wicking properties (skin side to outer side) and cooling properties (at noon 925 W / m² under sweat-wet conditions). -2 Cooling effect under solar irradiation), cooling performance (heating element with 250W m -2 The heating power simulates skin heating and is measured at 32 mL / min. -1 m -2 The results of the test on the cooling effect during sweating (at the rate of sweating) are shown in the table below.

[0079] Table 1

[0080]

[0081]

[0082] As shown in the table above, the radiation evaporation integrated cooling fabric achieves better cooling and refrigeration performance than Comparative Examples 1-3. In Comparative Example 2, due to the lack of an outermost hydrophobic radiation cooling layer, it cannot achieve sub-environmental cooling under wet conditions, and its temperature is only 2°C lower than that of traditional radiation cooling fabrics. Comparative Examples 1 and 3, because they failed to achieve a three-layer structure with both diameter and wetting gradients, cannot achieve a unidirectional moisture-wicking effect, and therefore their cooling and refrigeration performance is worse than that of Example 1.

[0083] In summary, the radiation-evaporative integrated cooling fabric provided by this invention employs a multi-layer design. The top layer, a hydrophobic radiation-cooling layer, prevents sweat from reaching the outer surface of the fabric, thus solving the problem of sweat accumulation on the fabric surface leading to strong absorption of near-infrared sunlight and consequently reduced radiation-cooling efficiency. Composed of a hydrophobic layer, a transfer layer, and an evaporation layer, it features a hygroscopic gradient from hydrophobic to hydrophilic and a diameter gradient from large to small. Through pressure difference, sweat generated on the skin side can be quickly transferred from the hydrophobic layer and conducted to the evaporation layer for evaporation, avoiding the sticky feeling of sweat on the skin while accelerating the sweat evaporation rate. By combining radiation-cooling and evaporative cooling, effective body cooling is achieved.

[0084] It should be noted that this application is not limited to the above-described embodiments. The above embodiments are merely examples, and any embodiments with the same structure and effect as the technical concept within the scope of this application are included in the technical scope of this application. Furthermore, various modifications that can be conceived by those skilled in the art to the embodiments, and other ways of constructing by combining some of the constituent elements of the embodiments, without departing from the spirit of this application, are also included in the scope of this application.

Claims

1. A radiation evaporation integrated cooling fabric, characterized in that: The membrane comprises, from bottom to top, a hydrophobic layer, a transfer layer, an evaporation layer, and a radiative cooling layer with hydrophobic properties; all four layers are electrospun membranes; the hydrophobic layer, transfer layer, and evaporation layer form a hygroscopic gradient from hydrophobic to hydrophilic; the fiber diameter of the hydrophobic layer is larger than that of the transfer layer, and the fiber diameter of the transfer layer is larger than that of the evaporation layer; the hydrophobic layer is a polyurethane electrospun membrane, the evaporation layer is a polyacrylonitrile electrospun membrane, and the transfer layer is a composite membrane of polyurethane and polyacrylonitrile.

2. The radiation evaporation integrated cooling fabric according to claim 1, characterized in that: The hydrophobic layer has a fiber diameter of 1μm-3μm, the transfer layer has a fiber diameter of 400-800 nm, and the evaporation layer has a fiber diameter of 100-300 nm.

3. The radiation evaporation integrated cooling fabric according to claim 1, characterized in that: The thickness of the hydrophobic layer is 10-20 μm, the thickness of the transfer layer is 40-60 μm, and the thickness of the evaporation layer is 80-100 μm.

4. The radiation evaporation integrated cooling fabric according to claim 1, characterized in that: The thickness of the radiation cooling layer is 400-500 μm.

5. The radiation evaporation integrated cooling fabric according to claim 1, characterized in that: The fiber diameter of the radiation cooling layer is 400-700 nm.

6. The radiation evaporation integrated cooling fabric according to claim 1, characterized in that: The radiation cooling layer is a white polymer electrospun film with hydrophobic properties.

7. The radiation evaporation integrated cooling fabric according to claim 1, characterized in that: The polymer of the radiation cooling layer is one of polymethyl methacrylate, polylactic acid, polytetrafluoroethylene, and polyvinylidene fluoride.

Images