Double-layer fabric capable of realizing passive refrigeration by reflecting solar radiation and preparation method of double-layer fabric

Abstract

The invention relates to a double-layer fabric capable of realizing passive refrigeration by reflecting solar radiation and a preparation method of the double-layer fabric, and belongs to the technical field of textile materials. The passive refrigeration double-layer fabric by reflecting solar radiation comprises a first fabric unit, a connecting unit and a second fabric unit, the first fabric unit comprises at least one of polyimide yarns and silver-plated yarns, the second fabric unit comprises at least one of polyimide yarns and silver-plated yarns, and the first fabric unit is at least connected with the second fabric unit through the connecting unit. The reflecting capacity and the heat insulation effect of the double-layer fabric on solar radiation can be enhanced, the double-layer fabric reflects the solar radiation to achieve passive refrigeration, the influence of external heat on a human body or an object is reduced, the excellent refrigeration effect is achieved, and the double-layer fabric can be stably used for a long time in various environments.

Description

Technical Field

[0001] The present invention belongs to the technical field of textile materials, and specifically relates to a double-layer fabric for passive cooling by reflecting solar radiation and a preparation method thereof. Background Art

[0002] In recent years, the problems caused by global warming have attracted more and more attention. In high-temperature areas, keeping human body temperature within a comfortable range is a basic requirement for maintaining the smooth operation of production and life. Usually, air conditioning systems are used to adjust the temperature inside buildings to maintain a comfortable environment. In my country, building energy consumption can account for about 35% of the country's total energy consumption. Among them, air conditioning and refrigeration account for an astonishing 50% of building energy consumption; at the same time, the power source of the air conditioning system is mainly traditional fossil energy, and the carbon dioxide and other pollutants emitted during the combustion process have caused great pressure on the environment. Therefore, radiant cooling that does not require energy consumption has gradually attracted the attention of researchers.

[0003] As a new type of refrigeration technology, radiative cooling has great application potential in the fields of construction, textiles, automobiles, solar power generation, etc., especially in cities, where radiative cooling is expected to greatly alleviate the urban heat island effect. However, the actual production and application scale of radiative cooling materials is still small. This is because radiative cooling materials themselves still have shortcomings, such as complex preparation process, high cost, and performance that needs to be improved. Therefore, further research is still needed on radiative cooling materials.

[0004] Radiative cooling materials are widely used in building energy conservation, human health, logistics and transportation, outdoor sports, solar cells, etc., and are of great significance in alleviating environmental pressure and energy crisis. Combining radiative cooling materials with knitted fabrics not only retains the breathability and wearing comfort of the fabric itself, but also introduces radiative cooling into daily wear, broadening the temperature range of people's outdoor activities. Summary of the invention

[0005] The present invention proposes a double-layer fabric for passive cooling by reflecting solar radiation and a preparation method thereof, aiming to partially or completely solve the technical problem of how to combine radiation cooling materials with knitted fabrics in the prior art. The present invention adopts aging-resistant polyimide yarn and / or silver-plated yarn as the main body, and transmits the near-infrared spectrum of the covering by reflecting solar radiation and a special double-layer structure design to ensure the air permeability of the double-layer fabric while isolating the external heat, so as to achieve an excellent double-layer fabric cooling effect, and the double-layer fabric can be used stably for a long time in various environments. The technical solution of the present invention is as follows:

[0006] In a first aspect, a double-layer fabric for passive cooling by reflecting solar radiation comprises: a first fabric unit, a connecting unit, and a second fabric unit; the first fabric unit comprises at least one of polyimide yarn and silver-plated yarn, the second fabric unit comprises at least one of polyimide yarn and silver-plated yarn, and the first fabric unit is connected to the second fabric unit at least via the connecting unit.

[0007] Optionally, the connecting unit includes sewing thread; the first fabric unit and the second fabric unit both include double rib weave fabrics with polyimide yarn; or, the first fabric unit and the second fabric unit both include double rib weave fabrics with silver-plated yarn; or, the first fabric unit includes double rib weave fabrics with polyimide yarn, and the second fabric unit includes double rib weave fabrics with silver-plated yarn; or, the first fabric unit and the second fabric unit both include double rib weave fabrics with both polyimide yarn and silver-plated yarn.

[0008] Optionally, the connecting unit includes spacer wires; the first fabric unit includes a weft-woven fabric having polyimide yarns; the second fabric unit includes a weft-woven fabric having silver-plated yarns; or, the first fabric unit includes a weft-woven fabric having both polyimide yarns and silver-plated yarns; the second fabric unit includes a weft-woven fabric having both polyimide yarns and silver-plated yarns.

[0009] In a second aspect, a method for preparing a double-layer fabric for passive cooling by reflecting solar radiation, the method comprising the following steps:

[0010] Step S100: obtaining a first fabric unit, a connecting unit, and a second fabric unit, wherein the first fabric unit includes at least one of polyimide yarn and silver-plated yarn, and the second fabric unit includes at least one of polyimide yarn and silver-plated yarn;

[0011] Step S200: The first fabric unit is connected to the second fabric unit via a connecting unit to prepare a double-layer fabric.

[0012] Optionally, in step S100, the connecting unit includes sewing thread; the first fabric unit and the second fabric unit both include polyimide yarn, and the polyimide yarn is woven into double rib weave fabric; or, the first fabric unit and the second fabric unit both include silver-plated yarn, and the silver-plated yarn is woven into double rib weave fabric; or, the first fabric unit includes polyimide yarn, and the polyimide yarn is woven into double rib weave fabric, and the second fabric unit includes silver-plated yarn, and the silver-plated yarn is woven into double rib weave fabric; or, the first fabric unit and the second fabric unit both include polyimide yarn and silver-plated yarn, and the polyimide yarn and the silver-plated yarn are woven into double rib weave fabric.

[0013] Optionally, in step S100, the connecting unit includes spacer wires; the first fabric unit includes polyimide yarn, and the polyimide yarn is woven into a weft-woven fabric; the second fabric unit includes silver-plated yarn, and the silver-plated yarn is woven into a weft-woven fabric; or, the first fabric unit includes polyimide yarn and silver-plated yarn, and the polyimide yarn and the silver-plated yarn are woven into a weft-woven fabric; the second fabric unit includes polyimide yarn and silver-plated yarn, and the polyimide yarn and the silver-plated yarn are woven into a weft-woven fabric.

[0014] The beneficial effects achieved by the present invention are as follows:

[0015] (1) In the present invention, firstly, the polyimide yarn itself has low thermal conductivity and high infrared emissivity, which can effectively block heat transfer, and the silver-plated yarn can efficiently reflect solar radiation. When the first fabric unit and the second fabric unit respectively contain at least one of the two yarns and are connected to each other, the reflection ability and heat insulation effect of the double-layer fabric on solar radiation can be greatly enhanced, and the double-layer fabric can reflect solar radiation to achieve passive cooling, thereby reducing the impact of external heat on the human body or objects; in addition, the first fabric unit and the second fabric unit are connected by a connecting unit, so that the yarn of the double-layer fabric will not be easily displaced or deformed during use, and the structure is more It is strong and maintains the overall integrity of the double-layer fabric, and can be used stably for a long time in various environments; in addition, the double-layer fabric can adjust the proportion and distribution of the polyimide yarn and the silver-plated yarn in the first fabric unit and / or the second fabric unit according to different cooling needs and usage environment scenarios, meeting the flexible and diversified application needs of the double-layer fabric, especially in the hot summer, it can provide a good cooling effect and improve the comfort of the wearer; in addition, the passive cooling technology of the double-layer fabric does not rely on external energy, achieves true zero carbon emissions, and is very environmentally friendly, which helps to reduce dependence on traditional air conditioners and reduces energy consumption.

[0016] (2) In the present invention, the connecting unit at least includes (i.e., uses) sewing threads, and the first fabric unit and the second fabric unit are connected by the sewing threads. The firmness of the connection method ensures that the double-layer fabric will not be easily separated during use, and a stable double-layer structure is maintained, so that the cooling function can be performed stably for a long time; or, the connecting unit at least includes (i.e., uses) spacer threads, and two weft-woven fabric units (i.e., the first fabric unit and the second fabric unit) are connected by the spacer threads. This connection method not only ensures that there is a certain spacing between the two units, which is conducive to air circulation and heat dissipation, but also makes the double-layer structure stable and reliable. The spacer threads can effectively prevent the two fabric units from displacement, deformation and other problems during use, and maintain the overall structural integrity of the double-layer fabric; in addition, the weft-woven fabric is relatively light and thin, and has good air permeability. The flow of air between the double-layer structure helps to take away heat and moisture, improve the comfort when wearing or using, and reduce the feeling of stuffiness. It is suitable for outdoor sun protection clothing, awnings, etc., while ensuring the cooling function, it improves the user's outdoor experience quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 This is an optical microscope image of a double-layer fabric with a double rib weave structure woven with silver-plated yarn in the present application.

[0019] Figure 2 This is an optical microscope image of a double-layer fabric of a double rib weave fabric structure woven with polyimide yarn in the present application.

[0020] Figure 3 This is an optical microscope image of a double-layer fabric with an interlocking rib weave structure woven by parallel weaving of silver-plated yarn and polyimide yarn in the present application.

[0021] Figure 4a This is an optical microscope image of the polyimide surface of a double-layer fabric of a plain weave fabric structure woven with silver-plated yarn and polyimide yarn respectively in the present application.

[0022] Figure 4b This is an optical microscope image of the silver surface of a double-layer fabric of a plain weave fabric structure woven with silver-plated yarn and polyimide yarn respectively in the present application.

[0023] Figure 5This is an optical microscope image of a double-layer fabric with a plain weave structure woven with silver-plated yarn and polyimide yarn on the surface in the present application.

[0024] Figure 6 The present invention is a schematic flow chart of a method for preparing a knitted double-layer fabric for passive cooling by reflecting solar radiation.

[0025] Figure 7a A schematic diagram of an infrared thermal imaging image of the surface of a double-layer fabric A of a double rib weave fabric structure woven with silver-plated yarn in the present application after the temperature reaches a stable level after long-term illumination under a solar simulator;

[0026] Figure 7b A schematic diagram of an infrared thermal imaging image of the surface of a covering (foam board) under the double-layer fabric A of the interlocking rib fabric structure woven with silver-plated yarn in the present invention application after being exposed to light for a long time under a solar simulator to reach a stable temperature;

[0027] Figure 8a A schematic diagram of an infrared thermal imaging image of a double-layer fabric B of a double rib weave fabric structure woven with polyimide yarn in the present application, after the temperature reaches a stable level after long-term illumination under a solar simulator, and then irradiated onto the surface of the polyimide;

[0028] Figure 8b A schematic diagram of an infrared thermal imaging image of the surface of a covering (foam board) under the double-layer fabric B of the interlocking rib fabric structure woven with polyimide yarn in the present invention after being exposed to light for a long time under a solar simulator to reach a stable temperature;

[0029] Figure 9a It is a schematic diagram of an infrared thermal imaging image irradiated to the surface of the double-layer fabric C of the interlocking weave fabric structure of the silver-plated yarn and the polyimide yarn in the present application after the temperature reaches a stable level after long-term illumination under a solar simulator;

[0030] Figure 9b It is a schematic diagram of an infrared thermal imaging image of the surface of a covering (foam board) under the double-layer fabric C of the double-rib weave fabric structure woven with silver-plated yarn and polyimide yarn in the present application after being exposed to light for a long time under a solar simulator to reach a stable temperature;

[0031] Fig.10a A schematic diagram of an infrared thermal imaging image of a double-layer fabric D of a weft plain weave fabric structure woven with silver-plated yarn and polyimide yarn on the surface of the present invention after the temperature reaches a stable level after long-term illumination under a solar simulator, and then irradiated to the silver-plated surface;

[0032] Fig.10bThe double-layer fabric D of the weft plain weave fabric structure woven with silver-plated yarn and polyimide yarn on the surface of the present invention is exposed to the sunlight simulator for a long time to reach a stable temperature. The infrared thermal imaging image of the surface of the covering (foam board) under the fabric is schematically shown Figure 1 ;

[0033] Fig.10c It is a schematic diagram of an infrared thermal imaging image of a double-layer fabric D of a weft plain weave fabric structure woven with silver-plated yarn and polyimide yarn on the surface of the present invention, after the temperature reaches a stable level after long-term illumination under a solar simulator, and then irradiated to the polyimide surface;

[0034] Fig.10d The double-layer fabric D of the weft plain weave fabric structure woven with silver-plated yarn and polyimide yarn on the surface of the present invention is exposed to the sunlight simulator for a long time to reach a stable temperature. The infrared thermal imaging image of the surface of the covering (foam board) under the fabric is schematically shown Figure 2 ;

[0035] Fig.11a This is a schematic diagram of an infrared thermal imaging image of the double-layer fabric E of a weft plain weave structure woven with silver-plated yarn and polyimide yarn on the surface in the present application, after the temperature reaches a stable level after long-term illumination under a solar simulator;

[0036] Fig.11b This is a schematic diagram of the infrared thermal imaging image of the surface of the covering (foam board) under the double-layer fabric E with a weft plain weave fabric structure woven with silver-plated yarn and polyimide yarn on the surface in the present application after being exposed to light for a long time under a solar simulator to reach a stable temperature.

[0037] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments; based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0039] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention. "Including" can at least be understood as the meaning of only including. In order to make the purpose, technical solutions and advantages of the present invention clearer, the implementation methods of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0040] An exemplary description of a double-layer fabric for passive cooling by reflecting solar radiation

[0041] In a first aspect, a double-layer fabric for passive cooling by reflecting solar radiation comprises: a first fabric unit, a connecting unit, and a second fabric unit; the first fabric unit comprises at least one of polyimide yarn and silver-plated yarn, the second fabric unit comprises at least one of polyimide yarn and silver-plated yarn, and the first fabric unit is connected to the second fabric unit via the connecting unit.

[0042] In a double-layer fabric for passive cooling by reflecting solar radiation applied by the present invention, firstly, the polyimide yarn itself has low thermal conductivity and high infrared emissivity, which can effectively block heat transfer, and the silver-plated yarn can efficiently reflect solar radiation. When the first fabric unit and the second fabric unit respectively contain at least one of the two yarns and are connected to each other, the reflection ability and heat insulation effect of the double-layer fabric on solar radiation can be greatly enhanced, and the double-layer fabric can reflect solar radiation to achieve passive cooling, reducing the impact of external heat on the human body or objects; in addition, the first fabric unit and the second fabric unit are connected by a connecting unit, so that the yarn of the double-layer fabric will not be easily displaced during use. Or deformed, the structure is more solid, maintaining the overall integrity of the double-layer fabric, and can be used stably for a long time in various environments; in addition, the double-layer fabric can adjust the proportion and distribution of the polyimide yarn and the silver-plated yarn in the first fabric unit and / or the second fabric unit according to different cooling needs and usage environment scenarios, meeting the flexible and diversified application needs of the double-layer fabric, especially in the hot summer, it can provide a good cooling effect and improve the comfort of the wearer; in addition, the passive cooling technology of the double-layer fabric does not rely on external energy, achieves true zero carbon emissions, and is very environmentally friendly, helps to reduce dependence on traditional air conditioners and reduces energy consumption.

[0043] like Figures 1 to 3As shown, the connecting unit includes sewing thread; the first fabric unit and the second fabric unit both include double rib weave fabrics with polyimide yarn; or, the first fabric unit and the second fabric unit both include double rib weave fabrics with silver-plated yarn; or, the first fabric unit includes double rib weave fabrics with polyimide yarn, and the second fabric unit includes double rib weave fabrics with silver-plated yarn; or, the first fabric unit and the second fabric unit both include double rib weave fabrics with both polyimide yarn and silver-plated yarn.

[0044] In some embodiments, the first fabric unit and the second fabric unit may both be double rib weave fabrics having only polyimide yarns, that is, only polyimide yarns; or, the first fabric unit and the second fabric unit may both be double rib weave fabrics having only silver-plated yarns, that is, only silver-plated yarns; or, the first fabric unit may both be double rib weave fabrics having only polyimide yarns (that is, only polyimide yarns), and the second fabric unit may both be double rib weave fabrics having only silver-plated yarns (that is, only silver-plated yarns); or, the first fabric unit and the second fabric unit may both be double rib weave fabrics having only polyimide yarns and silver-plated yarns at the same time (that is, only polyimide yarns and silver-plated yarns at the same time).

[0045] In the present application, firstly, the fabric woven from polyimide yarn has excellent thermal insulation performance and can effectively block heat transfer, and the fabric woven from silver-plated yarn can efficiently reflect solar radiation. Accordingly, the combination of the first fabric unit and the second fabric unit can enhance the passive cooling effect of the double-layer fabric, so that the double-layer fabric as a whole exhibits good cooling performance when responding to solar radiation, and is also suitable for long-term outdoor use scenarios, such as sun protection clothing, awnings, etc.; in addition, the double rib structure itself has a stable structure and good elasticity, and the connecting unit at least includes (i.e., adopts) sewing thread, and at least the first fabric unit and the second fabric unit are connected by sewing thread. The firmness of the connection method ensures that the double-layer fabric will not be easily separated during use, and a stable double-layer structure is maintained, so that the cooling function can be exerted stably for a long time; in addition, the double rib structure has good wearing comfort, and the double rib structure provides better warmth retention, which is suitable for clothing in early winter and early spring, showing that the double-layer fabric of the present application has good environmental adaptability, adjustability and broad application market prospects.

[0046] like Figures 4a to 5 As shown, the connecting unit includes spacer wires; the first fabric unit includes a weft-woven fabric having polyimide yarns; the second fabric unit includes a weft-woven fabric having silver-plated yarns; or, the first fabric unit includes a weft-woven fabric having both polyimide yarns and silver-plated yarns; the second fabric unit includes a weft-woven fabric having both polyimide yarns and silver-plated yarns.

[0047] In some embodiments, the first fabric unit may be a plain weave fabric having only polyimide yarn (i.e., only polyimide yarn), and the second fabric unit may be a plain weave fabric having only silver-plated yarn (i.e., only silver-plated yarn); or, the first fabric unit may be a plain weave fabric having only polyimide yarn and silver-plated yarn at the same time (i.e., only polyimide yarn and silver-plated yarn at the same time); the second fabric unit may be a plain weave fabric having only polyimide yarn and silver-plated yarn at the same time (i.e., only polyimide yarn and silver-plated yarn at the same time).

[0048] In the present application, firstly, the first fabric unit includes polyimide yarn and the second fabric unit includes silver-plated yarn; or, the first fabric unit and the second fabric unit both include polyimide yarn and silver-plated yarn at the same time. The polyimide yarn has good thermal insulation, which can effectively block the transfer of heat and reduce the invasion of external heat into the interior. The silver-plated yarn can efficiently reflect solar radiation. The combination of polyimide yarn and silver-plated yarn, whether they constitute fabric units separately or are mixed in one fabric unit, greatly enhances the resistance to solar radiation, realizes the efficient passive cooling effect of double-layer fabric, and creates a cool environment for users. At the same time, the connecting unit at least includes (i.e., adopts) spacer wires, and at least two weft plain fabric units (i.e., the first fabric unit and the second fabric unit) are connected by the spacer wires. This connection method not only ensures There is a certain spacing space between the two units, which is conducive to air circulation and heat dissipation, and can make the double-layer structure stable and reliable. The spacer wire can effectively prevent the two fabric units from displacement, deformation and other problems during use, maintain the overall structural integrity of the double-layer fabric, and can be used stably for a long time in various environments; at the same time, the weft plain fabric is relatively light and thin, with good air permeability. The flow of air between the double-layer structure helps to take away heat and moisture, improve the comfort when wearing or using, and reduce the feeling of stuffiness. It is suitable for outdoor sun protection clothing, awnings, etc., while ensuring the cooling function, It improves the quality of users' outdoor experience; in addition, the proportion or distribution of polyimide yarn and silver-plated yarn in the fabric unit can be adjusted according to specific usage scenarios and needs, so that the double-layer fabric can be widely used in different passive cooling demand fields.

[0049] In a second aspect, a method for preparing a double-layer fabric for passive cooling by reflecting solar radiation comprises the following steps:

[0050] Step S100: obtaining a first fabric unit, a connecting unit, and a second fabric unit, wherein the first fabric unit includes at least one of polyimide yarn and silver-plated yarn, and the second fabric unit includes at least one of polyimide yarn and silver-plated yarn;

[0051] Step S200: The first fabric unit is connected to the second fabric unit via a connecting unit to prepare a double-layer fabric.

[0052] In a method for preparing a double-layer fabric for passive cooling by reflecting solar radiation applied in the present invention, firstly, the polyimide yarn itself has low thermal conductivity and high infrared emissivity, which can effectively block heat transfer, and the silver-plated yarn can efficiently reflect solar radiation. When the first fabric unit and the second fabric unit respectively contain at least one of the two yarns and are connected to each other, the reflection ability and heat insulation effect of the double-layer fabric on solar radiation can be greatly enhanced, and the double-layer fabric can reflect solar radiation to achieve passive cooling, reducing the influence of external heat on the human body or objects; in addition, the first fabric unit and the second fabric unit are connected by a connecting unit, so that the double-layer fabric can be used in a During the process, the yarn will not shift or deform easily, the structure is more solid, and the overall integrity of the double-layer fabric is maintained; in addition, the double-layer fabric can adjust the proportion and distribution of polyimide yarn and silver-plated yarn in the first fabric unit and / or the second fabric unit according to different cooling needs and usage environment scenarios, meeting the flexible and diversified application needs of the double-layer fabric, especially in the hot summer, it can provide good cooling effect and improve the comfort of the wearer; in addition, the passive cooling technology of the double-layer fabric does not rely on external energy, achieves true zero carbon emissions, and is very environmentally friendly, helping to reduce dependence on traditional air conditioners and reduce energy consumption.

[0053] Optionally, in step S100, the connecting unit includes sewing thread; the first fabric unit and the second fabric unit both include polyimide yarn, and the polyimide yarn is woven into double rib weave fabric; or, the first fabric unit and the second fabric unit both include silver-plated yarn, and the silver-plated yarn is woven into double rib weave fabric; or, the first fabric unit includes polyimide yarn, and the polyimide yarn is woven into double rib weave fabric, and the second fabric unit includes silver-plated yarn, and the silver-plated yarn is woven into double rib weave fabric; or, the first fabric unit and the second fabric unit both include polyimide yarn and silver-plated yarn, and the polyimide yarn and the silver-plated yarn are woven into double rib weave fabric.

[0054] In the present application, the connecting unit at least includes (i.e. adopts) sewing thread, by which the first fabric unit and the second fabric unit are connected. The firmness of the connection method ensures that the double-layer fabric will not be easily separated during use, maintaining a stable double-layer structure, so that the refrigeration function can be performed stably for a long time.

[0055] Optionally, in step S100, the connecting unit includes spacer wires; the first fabric unit includes polyimide yarn, and the polyimide yarn is woven into a weft-woven fabric; the second fabric unit includes silver-plated yarn, and the silver-plated yarn is woven into a weft-woven fabric; or, the first fabric unit includes polyimide yarn and silver-plated yarn, and the polyimide yarn and the silver-plated yarn are woven into a weft-woven fabric; the second fabric unit includes polyimide yarn and silver-plated yarn, and the polyimide yarn and the silver-plated yarn are woven into a weft-woven fabric.

[0056] In the present application, firstly, two weft-woven fabric units (i.e., the first fabric unit and the second fabric unit) are connected by spacer wires. This connection method not only ensures that there is a certain spacing space between the two units, which is beneficial to air circulation and heat dissipation, but also makes the double-layer structure stable and reliable. The spacer wires can effectively prevent the two fabric units from displacement, deformation and other problems during use, and maintain the overall structural integrity of the double-layer fabric. In addition, the weft-woven fabric is relatively light and thin, with good air permeability. The flow of air between the double-layer structure helps to take away heat and moisture, improves the comfort when wearing or using, and reduces the feeling of stuffiness. It is suitable for outdoor sun protection clothing, awnings, etc., while ensuring the cooling function, it improves the quality of the user's outdoor experience. In addition, the proportion or distribution of polyimide yarn and silver-plated yarn in the fabric unit can be adjusted according to specific usage scenarios and needs, so that the double-layer fabric can be widely used in different passive cooling demand fields.

[0057] Test examples of cooling effect of double-layer fabric A, double-layer fabric B, double-layer fabric C, double-layer fabric D, and double-layer fabric E samples Sexual Description

[0058] (1) Double-layer fabric A

[0059] A double-layer fabric A (hereinafter referred to as double-layer fabric A) for passive cooling by reflecting solar radiation. The first fabric unit of the double-layer fabric A comprises 100D commercial silver yarn (i.e., silver-plated yarn), which is woven into a double rib fabric, and the second fabric unit comprises 100D commercial silver yarn (i.e., silver-plated yarn), which is woven into a double rib fabric. The first fabric unit is connected to the second fabric unit by sewing thread, thereby preparing the double-layer fabric A.

[0060] from Figure 7a , Figure 7b It can be seen that after the double-layer fabric A is irradiated under the solar simulator until the surface temperature stabilizes, the surface temperature of the double-layer fabric A reaches a maximum of 64 degrees Celsius, while the temperature of the contact surface of the cover (foam board) under the double-layer fabric A reaches a maximum of 58.5 degrees Celsius, and the temperature reduction range exceeds 5 degrees Celsius. The double-layer fabric A has an obvious cooling effect by passive cooling through reflecting solar radiation.

[0061] (2) Double-layer fabric B

[0062] A double-layer fabric B (hereinafter referred to as double-layer fabric B) that passively cools by reflecting solar radiation. The first fabric unit of the double-layer fabric B includes 400D / 128F polyimide yarn, which is woven into a double rib weave fabric, and the second fabric unit includes 400D / 128F polyimide yarn, which is woven into a double rib weave fabric. The first fabric unit is connected to the second fabric unit by sewing thread, thereby preparing the double-layer fabric B.

[0063] from Figure 8a , Figure 8b When the double-layer fabric B was irradiated under the solar simulator until the surface temperature of the polyimide stabilized, the temperature of the double-layer fabric B reached a maximum of 59.5 degrees Celsius, while the temperature of the contact surface of the cover (foam board) under the double-layer fabric B reached a maximum of 43.8 degrees Celsius. The temperature drop exceeded 15 degrees Celsius. The double-layer fabric B had an obvious cooling effect by passive cooling through reflecting solar radiation.

[0064] (3) Double-layer fabric C

[0065] A double-layer fabric C (hereinafter referred to as double-layer fabric C) for passive cooling by reflecting solar radiation, wherein a first fabric unit of the double-layer fabric C comprises 100D commercial silver yarn (i.e., silver-plated yarn) and 400D / 128F polyimide yarn, and the 100D commercial silver yarn and the 400D / 128F polyimide yarn are woven into a double rib weave fabric, and a second fabric unit comprises 400D / 128F polyimide yarn and 100D commercial silver yarn (i.e., silver-plated yarn), and the 400D / 128F polyimide yarn and the 100D commercial silver yarn (i.e., silver-plated yarn) are both woven into a double rib weave fabric; the first fabric unit is connected to the second fabric unit by sewing thread, thereby preparing the double-layer fabric C.

[0066] Figure 9a , Figure 9b It can be seen that after the surface temperature of the double-layer fabric C is stabilized under the solar simulator, the surface temperature of the double-layer fabric C reaches a maximum of 70.8 degrees Celsius, while the temperature of the contact surface of the cover (foam board) under the double-layer fabric C is up to 54 degrees Celsius, and the temperature reduction range exceeds 16 degrees Celsius. The double-layer fabric C has an obvious cooling effect by passive cooling through reflecting solar radiation.

[0067] (4) Double-layer fabric D

[0068] A double-layer fabric D (hereinafter referred to as double-layer fabric D) that passively cools by reflecting solar radiation. The first fabric unit of the double-layer fabric D includes 100D commercial silver yarn (i.e., silver-plated yarn), which is woven into a plain weave fabric. The second fabric unit includes 400D / 128F polyimide yarn, which is woven into a plain weave fabric. The first fabric unit is connected to the second fabric unit via spacer yarns, thereby preparing the double-layer fabric D.

[0069] from Fig.10a , Fig.10b , after the double-layer fabric D was irradiated under the solar simulator until the temperature of the silver-plated surface stabilized, the surface temperature of the double-layer fabric D reached a maximum of 60.9 degrees Celsius, while the temperature of the contact surface of the cover (foam board) under the double-layer fabric D reached a maximum of 45.6 degrees Celsius, with a temperature drop of more than 15 degrees Celsius. The double-layer fabric D has an obvious cooling effect by reflecting solar radiation passive cooling. .

[0070] from Fig.10c , Fig.10d It can be seen that after the double-layer fabric D is irradiated under the solar simulator until the surface temperature of the polyimide stabilizes, the surface temperature of the double-layer fabric D reaches a maximum of 57.9 degrees Celsius, while the temperature of the contact surface of the cover (foam board) under the double-layer fabric D is up to 36.7 degrees Celsius. The temperature reduction range exceeds 21 degrees Celsius. The double-layer fabric D has an obvious cooling effect by reflecting solar radiation passive cooling.

[0071] (5) Double-layer fabric E

[0072] A double-layer fabric E (hereinafter referred to as double-layer fabric E) for passive cooling by reflecting solar radiation, wherein a first fabric unit of the double-layer fabric E comprises 100D commercial silver yarn (i.e., silver-plated yarn) and 400D / 128F polyimide yarn, and the 100D commercial silver yarn and the 400D / 128F polyimide yarn are woven into a plain weave fabric, and a second fabric unit comprises 400D / 128F polyimide yarn and 100D commercial silver yarn (i.e., silver-plated yarn), and the 400D / 128F polyimide yarn and the 100D commercial silver yarn (i.e., silver-plated yarn) are both woven into a plain weave fabric; the first fabric unit is connected to the second fabric unit via a spacer yarn, and thus the double-layer fabric E is prepared.

[0073] from Fig.11a , Fig.11b It can be seen that after the double-layer fabric E is irradiated under the solar simulator until the surface temperature stabilizes, the surface temperature of the double-layer fabric E reaches a maximum of 59.8 degrees Celsius, while the temperature of the contact surface of the cover (foam board) under the double-layer fabric E is up to 41.0 degrees Celsius. The temperature reduction exceeds 18 degrees Celsius. The double-layer fabric E has an obvious cooling effect by passive cooling through reflecting solar radiation.

[0074] The drawings are only one of the embodiments of the present invention, and the actual structure is not limited thereto. In short, if ordinary technicians in the field are inspired by it and design a structure and embodiment similar to the technical solution without creativity without departing from the purpose of the present invention, they should all fall within the protection scope of the present invention.

Claims

1. A double-layer fabric for passive cooling by reflecting solar radiation, characterized in that: include: A first fabric unit, a connecting unit and a second fabric unit; the first fabric unit comprises at least one of polyimide yarn and silver-plated yarn, the second fabric unit comprises at least one of polyimide yarn and silver-plated yarn, and the first fabric unit is connected to the second fabric unit at least through the connecting unit.

2. A double-layer fabric for passive cooling by reflecting solar radiation according to claim 1, characterized in that: The connecting unit includes sewing thread; the first fabric unit and the second fabric unit both include double rib weave fabrics with polyimide yarn; or, the first fabric unit and the second fabric unit both include double rib weave fabrics with silver-plated yarn; or, the first fabric unit includes double rib weave fabrics with polyimide yarn, and the second fabric unit includes double rib weave fabrics with silver-plated yarn; or, the first fabric unit and the second fabric unit both include double rib weave fabrics with both polyimide yarn and silver-plated yarn.

3. A double-layer fabric for passive cooling by reflecting solar radiation according to claim 2, characterized in that: The connecting unit includes spacer wires; the first fabric unit includes a weft-woven fabric with polyimide yarns; the second fabric unit includes a weft-woven fabric with silver-plated yarns; or, the first fabric unit includes a weft-woven fabric with both polyimide yarns and silver-plated yarns; the second fabric unit includes a weft-woven fabric with both polyimide yarns and silver-plated yarns.

4. A method for preparing a double-layer fabric for passive cooling by reflecting solar radiation, comprising the following steps: Step S100: obtaining a first fabric unit, a connecting unit, and a second fabric unit, wherein the first fabric unit includes at least one of polyimide yarn and silver-plated yarn, and the second fabric unit includes at least one of polyimide yarn and silver-plated yarn; Step S200: The first fabric unit is connected to the second fabric unit via a connecting unit to prepare a double-layer fabric.

5. The method for preparing a double-layer fabric for passive cooling by reflecting solar radiation according to claim 4, characterized in that: In step S100, the connection unit includes sewing thread; the first fabric unit and the second fabric unit both include polyimide yarn, and the polyimide yarn is woven into an interlock weave fabric; or, the first fabric unit and the second fabric unit both include silver-plated yarn, and the silver-plated yarn is woven into an interlock weave fabric; Or, the first fabric unit includes polyimide yarn, the polyimide yarn is woven into an interlock weave fabric, and the second fabric unit includes silver-plated yarn, the silver-plated yarn is woven into an interlock weave fabric; Alternatively, the first fabric unit and the second fabric unit both include polyimide yarn and silver-plated yarn, and the polyimide yarn and the silver-plated yarn are woven into double rib weave fabrics.

6. The method for preparing a double-layer fabric for passive cooling by reflecting solar radiation according to claim 4, characterized in that: In step S100, the connecting unit includes spacer wires; the first fabric unit includes polyimide yarn, and the polyimide yarn is woven into a plain weave fabric; the second fabric unit includes silver-plated yarn, and the silver-plated yarn is woven into a plain weave fabric; or, the first fabric unit includes polyimide yarn and silver-plated yarn, and the polyimide yarn and the silver-plated yarn are woven into a plain weave fabric; the second fabric unit includes polyimide yarn and silver-plated yarn, and the polyimide yarn and the silver-plated yarn are woven into a plain weave fabric.

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