A cooling product and a preparation method of a full solar spectrum high-reflection fabric

Abstract

The present application discloses a cooling product characterized by comprising a full solar spectrum high-reflection film with micro-nanopores formed by intertwining a plurality of micro-nano fibers and a base material; the micro-nano fibers are connected by micro-nanospheres; the total volume of the micro-nanospheres with a diameter of 10 nm to 10 μm and the micro-nanopores with a diameter of 10 nm to 10 μm in the full solar spectrum high-reflection film accounts for 10% to 90% of the volume of the full solar spectrum high-reflection film, preferably 50% to 90%, and more preferably 70% to 90%. Also disclosed is a method for preparing a full solar spectrum high-reflection fabric, characterized by comprising the following steps: preparing a cooling base fabric; preparing a full solar spectrum high-reflection film; and compositely bonding the full solar spectrum high-reflection film to the cooling base fabric to obtain the full solar spectrum high-reflection fabric.

Description

Technical Field

[0001] The present application relates to the technical field of cooling products, and in particular to a method for preparing a cooling product and a full solar spectrum highly reflective fabric. Background Art

[0002] Traditional building thermal control systems often consume enormous amounts of energy to cope with extreme weather conditions, such as high temperatures, and contribute to climate issues like the greenhouse effect, further increasing the intensity and frequency of these extreme weather events. Overheating can also harm human health, causing discomfort and illness. Personal thermal management, a technology that provides heating or cooling only to an individual and their local environment, can achieve passive cooling while meeting personalized thermal comfort needs, reducing reliance on inefficient temperature control methods like air conditioning.

[0003] For outdoor environments, the solar spectrum irradiance is mainly distributed in the ultraviolet, visible and near-infrared wavelength ranges (0.3-2.5μm), with a total power density of about 1000W / m 2 The human body's exposed skin can absorb more than 60% of the total solar irradiance, thus generating a large amount of energy input. With the extension of metasurface technology in the field of thermal management technology, cooling technology based on intelligent cooling materials has emerged.

[0004] Patent Document 1 discloses a radiant cooling coating and its application. A self-healing agent and cooling particles are dispersed in a polymer emulsion to prepare the radiant cooling coating, and the surface is covered with metal particles as a thin layer. Patent Document 2 discloses a polymer film composite radiant cooling material containing hollow titanium dioxide spheres. A vinylidene fluoride-hexafluoropropylene copolymer is uniformly mixed with the hollow titanium dioxide spheres, and a composite radiant cooling film is obtained by coating and drying. The preparation process of the coating film material of the above invention is complex, and the introduction of dopants makes the material susceptible to aging. Furthermore, the material lacks the necessary breathability and comfort, making it unsuitable for local cooling of human skin.

[0005] The innovative development of nanotechnology has transformed cooling materials from an idea into reality, and the field of cooling fabrics has also seen significant progress in recent years. Patent Document 3 proposes a method for preparing radiative cooling fibers and fabrics thereof. Inorganic micro-nanoparticles are introduced into polymer fibers using a melt-spinning composite method, and further woven into a fabric suitable for cooling the surface of human skin. The resulting fiber fabric has a cooling effect, but the fabric has low strength, high light transmittance, poor wear resistance, and lacks waterproof and anti-fouling properties. Furthermore, the introduction of titanium dioxide particles often leads to ultraviolet light absorption, making the material susceptible to aging and unsuitable for further preparation of outdoor cooling fabrics.

[0006] In summary, current cooling devices have the following problems: (1) Refrigeration materials in the form of coatings and films lack wear comfort and have a limited range of applications; (2) Cooling fabrics have low strength, high light transmittance, poor wear resistance, and lack waterproof and anti-fouling properties, making them unsuitable for use in outdoor clothing; (3) Outdoor cooling fabrics or films are usually UV-absorbing, and have problems such as being unable to reflect the entire solar spectrum, easily accelerating material aging, poor durability, and poor cooling performance.

[0007] Prior art literature

[0008] Patent Document 1: CN110256924A Publication

[0009] Patent Document 2: CN109705819A Publication

[0010] Patent Document 3: CN110685031A Publication Summary of the Invention

[0011] To address the above-mentioned issues, the present application provides a cooling product that can achieve high reflectivity across the entire solar spectrum. More specifically, it provides a full-solar-spectrum high-reflectivity fabric. While achieving wearability, the fabric also possesses excellent mechanical properties, waterproof and anti-fouling properties, abrasion resistance, and cooling characteristics. Furthermore, the fabric achieves high reflectivity across the entire solar spectrum, preventing material aging while improving the cooling effect. This allows for the preparation of fabrics suitable for outdoor cooling, and enables large-scale batch production. The present application also provides a method for preparing full-solar-spectrum high-reflectivity fabrics.

[0012] The specific technical solutions of this application are as follows:

[0013] 1. A cooling product, characterized in that:

[0014] The invention comprises a full solar spectrum high reflective film with micro-nano pores formed by winding and interweaving a plurality of micro-nano fibers and a base material; the micro-nano fibers are connected by micro-nano balls;

[0015] The total volume of the micro-nanospheres with a diameter of 10 nm to 10 μm and the micro-nanopores with a diameter of 10 nm to 10 μm in the full solar spectrum high reflective film accounts for 10% to 90% of the volume of the full solar spectrum high reflective film, preferably 50% to 90%, more preferably 70% to 90%;

[0016] Preferably, the total volume of the micro-nanospheres with a diameter of 50 nm to 5 μm and the micro-nanopores with a diameter of 50 nm to 5 μm in the full solar spectrum high reflective film accounts for 10% to 90% of the volume of the full solar spectrum high reflective film, preferably 50% to 90%, more preferably 70% to 90%;

[0017] Preferably, the total volume of the micro-nano spheres with a diameter of 100nm to 1000nm and the micro-nano pores with a diameter of 100nm to 1000nm in the full solar spectrum high reflective film accounts for 10% to 90% of the volume of the full solar spectrum high reflective film, preferably 50% to 90%, and more preferably 70% to 90%.

[0018] 2. The cooling product according to item 1 is characterized in that the thickness of the full solar spectrum high reflective film is 10 μm to 200 μm, preferably 20 μm to 100 μm, and more preferably 40 μm to 60 μm.

[0019] 3. The cooling product according to item 1 or 2, characterized in that the material of the micro-nano fibers is selected from one or more of the following: polytetrafluoroethylene (PTFE), polyurethane (PU), polyethylene glycol (PEO), polyethylene (PE) and polyamide (PA);

[0020] Preferably, the material of the micro-nano fibers and micro-nano balls is polytetrafluoroethylene (PTFE) or polyurethane (PU).

[0021] 4. The cooling product according to any one of items 1 to 3 is characterized in that it is a high-reflection fabric for the entire solar spectrum, wherein the base material is a refrigeration base fabric.

[0022] 5. The cooling product according to item 4 is characterized in that the refrigeration base fabric is a fabric selected from a knitted structure, a woven structure or a non-woven fabric structure.

[0023] 6. The cooling product according to any one of items 1 to 3, characterized in that it is an outdoor textile, wherein the base material is a fabric of a non-woven fabric structure;

[0024] Preferably, the outdoor textile is a mask.

[0025] 7. The cooling product according to item 5 or 6, characterized in that the fabric comprises cooling fibers, and the cooling fibers comprise inorganic micro-nano particles and a polymer matrix;

[0026] Preferably, the fabric is formed of cooling fibers, and the cooling fibers are formed of inorganic micro-nano particles and a polymer matrix.

[0027] 8. The cooling product according to item 7, characterized in that the inorganic micro-nanoparticles are selected from one or more of the following: titanium dioxide (TiO2), silicon dioxide (SiO2), zinc oxide (ZnO), silicon carbide (SiC), silicon nitride (Si3N4), zinc sulfide (ZnS), aluminum oxide (Al2O3), magnesium oxide (MgO), boron nitride (BN), barium sulfate (BaSO4), barium carbonate (BaCO3) and aluminum silicate (Al2SiO5);

[0028] Preferably, the inorganic micro-nano particles have a particle size of 0.1 μm to 25 μm, preferably 0.3 μm to 5 μm, more preferably 0.4 μm to 1.2 μm;

[0029] Preferably, the inorganic micro-nanoparticles are titanium dioxide (TiO2) or zinc oxide (ZnO).

[0030] 9. The cooling product according to item 7 or 8, characterized in that the material of the polymer substrate comprises one or more of the following: polylactic acid (PLA), polymethyl methacrylate (PMMA), polyethylene (PE), polypropylene (PP), polyamide (PA), polyethylene terephthalate (PET), polyvinylidene fluoride (PVDF), polyvinyl chloride (PVC), polystyrene (PS), polyvinyl alcohol (PVA), polyurethane (PU), polyacrylonitrile (PAN), cellulose, chitosan, poly(p-phenylene terephthalamide) and poly(p-benzamide);

[0031] Preferably, the material of the polymer substrate is polylactic acid (PLA) or polymethyl methacrylate (PMMA).

[0032] 10. A method for preparing a full solar spectrum highly reflective fabric, characterized in that it comprises the following steps:

[0033] preparing a refrigeration base fabric;

[0034] Preparation of full solar spectrum highly reflective films;

[0035] The full solar spectrum high reflective film is compounded on the refrigeration base cloth to obtain the full solar spectrum high reflective fabric.

[0036] 11. The preparation method according to item 10, characterized in that in the step of preparing the cooling base fabric, inorganic micro-nano particles and a polymer substrate are mixed to obtain a composite material, the composite material is made into cooling fibers, and the cooling fibers are then made into fabrics to obtain the cooling base fabric;

[0037] Preferably, the refrigeration base fabric is a fabric selected from a knitted structure, a woven structure or a non-woven structure.

[0038] 12. The preparation method according to item 11, characterized in that the inorganic micro-nanoparticles are selected from one or more of the following: titanium dioxide (TiO2), silicon dioxide (SiO2), zinc oxide (ZnO), silicon carbide (SiC), silicon nitride (Si3N4), zinc sulfide (ZnS), aluminum oxide (Al2O3), magnesium oxide (MgO), boron nitride (BN), barium sulfate (BaSO4), barium carbonate (BaCO3) and aluminum silicate (Al2SiO5);

[0039] Preferably, the inorganic micro-nano particles have a particle size of 0.1 μm to 25 μm, preferably 0.3 μm to 5 μm, more preferably 0.4 μm to 1.2 μm;

[0040] Preferably, the inorganic micro-nanoparticles are titanium dioxide (TiO2) or zinc oxide (ZnO).

[0041] 13. The preparation method according to any one of items 11 or 12, characterized in that the material of the polymer substrate comprises one or more of the following: polylactic acid (PLA), polymethyl methacrylate (PMMA), polyethylene (PE), polypropylene (PP), polyamide (PA), polyethylene terephthalate (PET), polyvinylidene fluoride (PVDF), polyvinyl chloride (PVC), polystyrene (PS), polyvinyl alcohol (PVA), polyurethane (PU), polyacrylonitrile (PAN), cellulose, chitosan, poly(p-phenylene terephthalamide) and poly(p-benzamide);

[0042] Preferably, the material of the polymer substrate is polylactic acid (PLA) or polymethyl methacrylate (PMMA).

[0043] 14. The preparation method according to any one of items 11 to 13 is characterized in that the composite material is made into a cooling fiber by using one or more methods selected from melt spinning, wet spinning, hot drawing, electrospinning, and melt blown spinning, preferably by using melt spinning or hot drawing.

[0044] 15. The preparation method according to any one of items 10 to 14 is characterized in that in the step of preparing the full solar spectrum high reflective film, the full solar spectrum high reflective film is prepared by using micro-nano fibers and micro-nano balls as materials through a biaxial stretching method or an electrospinning method.

[0045] 16. The preparation method according to any one of items 10 to 15 is characterized in that the full solar spectrum high reflective film is formed by winding and interweaving a plurality of micro-nano fibers and has micro-nano pores; the micro-nano fibers are connected by micro-nano balls.

[0046] 17. The preparation method according to any one of items 10 to 16, characterized in that the total volume of the micro-nanospheres with a diameter of 10 nm to 10 μm and the micro-nanopores with a diameter of 10 nm to 10 μm in the full solar spectrum high reflective film accounts for 10% to 90% of the volume of the full solar spectrum high reflective film, preferably 50% to 90%, and more preferably 70% to 90%;

[0047] Preferably, the total volume of the micro-nanospheres with a diameter of 50 nm to 5 μm and the micro-nanopores with a diameter of 50 nm to 5 μm in the full solar spectrum high reflective film accounts for 10% to 90% of the volume of the full solar spectrum high reflective film, preferably 50% to 90%, more preferably 70% to 90%;

[0048] Preferably, the total volume of the micro-nano spheres with a diameter of 100nm to 1000nm and the micro-nano pores with a diameter of 100nm to 1000nm in the full solar spectrum high reflective film accounts for 10% to 90% of the volume of the full solar spectrum high reflective film, preferably 50% to 90%, and more preferably 70% to 90%.

[0049] 18. The preparation method according to any one of items 10 to 17 is characterized in that the thickness of the full solar spectrum high-reflection film is 10 μm to 200 μm, preferably 20 μm to 100 μm, and more preferably 40 μm to 60 μm.

[0050] 19. The preparation method according to any one of items 10 to 18, characterized in that the materials of the micro-nano fibers and micro-nano spheres are selected from one or more of the following: polytetrafluoroethylene (PTFE), polyurethane (PU), polyethylene glycol (PEO), polyethylene (PE) and polyamide (PA);

[0051] Preferably, the material of the micro-nano fibers and micro-nano balls is polytetrafluoroethylene (PTFE) or polyurethane (PU).

[0052] 20. The preparation method according to any one of items 10 to 19 is characterized in that after the step of preparing the full solar spectrum high-reflection film, the full solar spectrum high-reflection film is compounded on the refrigeration base cloth by using a dot-bonding method or a hot pressing compounding method to obtain the full solar spectrum high-reflection fabric.

[0053] Effects of the Invention

[0054] The cooling product of the present application includes a full solar spectrum high-reflection film and a base material with a total volume percentage of micro-nanospheres and micro-nanopores with a diameter limited to a specific range. It can achieve reflection of the ultraviolet (300-400nm), visible (400-760nm), near-infrared band (760-2500nm), that is, the full solar band (0.3-2.5μm) spectrum, and is thus independently suitable for various cooling scenarios, such as cooling fabrics, cooling windows, cooling metal materials, cooling buildings, cooling packaging, etc.

[0055] The full solar spectrum high reflective fabric of the present application is obtained by laminating a full solar spectrum high reflective film on a refrigeration base cloth. The full solar spectrum high reflective film limits the total volume percentage of micro-nano spheres and micro-nano pores with diameters within a specific range. The full solar spectrum high reflective fabric prepared by the preparation method of the present application is compounded with the full solar spectrum high reflective film, thereby reducing light leakage caused by the warp and weft weaving structure, and at the same time has good mechanical properties, waterproof and anti-fouling properties, wear resistance, etc.

[0056] The full solar spectrum reflective fabric of the present application reflects the ultraviolet-visible-near infrared band, that is, the entire solar radiation band, greatly enhancing the cooling effect while avoiding material aging. It is suitable for outdoor use and can be produced on a large scale, suitable for industrial amplification applications.

[0057] The full solar spectrum high reflective film of the present application mainly plays the role of reflecting ultraviolet light in the full solar spectrum high reflective fabric, and also plays the role of reflecting visible light and near-infrared light to a certain extent. The refrigeration base fabric mainly plays the role of reflecting visible light band and near-infrared band. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] Figure 1 This is a schematic structural diagram of a full solar spectrum highly reflective fabric according to a specific embodiment of the present application.

[0059] Figure 2 This is a microscopic schematic diagram of a full solar spectrum high reflective film according to a specific embodiment of the present application.

[0060] Explanation of symbols

[0061] 1Full solar spectrum high reflective film 2Micro-nanospheres

[0062] 3 Micro-nano pores 4 Micro-nano fibers

[0063] 5 Refrigeration base fabric DETAILED DESCRIPTION

[0064] The present application is described in detail below. Although specific embodiments of the present application are shown, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present application and to fully convey the scope of the present application to those skilled in the art.

[0065] It should be noted that the terms "including" and "comprising" used throughout the specification and claims are open-ended and should be interpreted as meaning "including, but not limited to." The specification subsequently describes preferred embodiments of the present application. However, such descriptions are intended to provide a general understanding of the specification and are not intended to limit the scope of the present application. The scope of protection of the present application shall be determined by the appended claims.

[0066] The present application provides a cooling product, such as Figure 1 As shown, it is characterized in that

[0067] It includes a full solar spectrum high reflective film 1 with micro-nano pores 3 formed by winding and interweaving multiple micro-nano fibers 4 and a base material; the micro-nano fibers 4 are connected by micro-nano balls 2;

[0068] The total volume of the micro-nanospheres 2 with a diameter of 10nm to 10μm and the micro-nanopores 3 with a diameter of 10nm to 10μm in the full solar spectrum high reflection film 1 accounts for 10% to 90% of the volume of the full solar spectrum high reflection film 1, preferably 50% to 90%, and more preferably 70% to 90%.

[0069] In the present application, two or three or more micro-nano fibers can be connected by a micro-nano ball.

[0070] In a specific embodiment, in the cooling product of the present application, the total volume of the micro-nanospheres and micro-nanopores with a diameter of 10nm to 10μm in the full solar spectrum high reflective film accounts for 10% to 90% of the volume of the full solar spectrum high reflective film, for example, it can be 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, etc., preferably 50% to 90%, more preferably 70% to 90%.

[0071] In the above specific embodiment, the volume of the full solar spectrum high reflective film is the sum of the following three items: (1) the total volume of micro-nanospheres and micro-nanopores with a diameter of 10nm to 10μm; (2) the total volume of micro-nanospheres and micro-nanopores with a diameter not in the range of 10nm to 10μm; and (3) the total volume of micro-nanofibers.

[0072] For the micro-nanospheres and micro-nanopores that serve as scatterers, a scanning electron microscope (SEM) is used to capture images. The particle size of the micro-nanospheres and the pore size that meet the requirements are counted from the images. The sum of the volumes of the micro-nanospheres and pores is calculated and then divided by the total volume to obtain the volume percentage of the micro-nanospheres and micro-nanopores that are the so-called scatterers. In this application, the volume of the full solar spectrum high-reflection film is the sum of the volume of all fibers that constitute the full solar spectrum high-reflection film and the volume of all pores formed by all fibers.

[0073] In the present application, micro-nanospheres with a diameter of 10 nm to 10 μm and micro-nanopores with a diameter of 10 nm to 10 μm can act together as scatterers to reflect solar radiation. The present application does not limit the respective volumes of the micro-nanospheres with a diameter of 10 nm to 10 μm and the micro-nanopores with a diameter of 10 nm to 10 μm.

[0074] The "diameter of micro-nanosphere" in this application refers to the diameter of a single micro-nanosphere. The diameter of the micro-nanosphere can be obtained by taking an image using a scanning electron microscope (SEM) and measuring and calculating the image according to a scale. The micro-nanosphere with a diameter of 10 nm to 10 μm can be, for example, a micro-nanosphere with a diameter of 10 nm, 50 nm, 100 nm, 200 nm, 300 nm, 400 nm, 500 nm, 600 nm, 700 nm, 800 nm, 900 nm, 1 μm, 2 μm, 3 μm, 4 μm, 5 μm, 6 μm, 7 μm, 8 μm, 9 μm, 10 μm, etc.

[0075] The "diameter of micro-nanopores" in this application refers to the diameter of a single micro-nanopore. The diameter of a micro-nanopore can be obtained by taking an image using a scanning electron microscope (SEM) and measuring and calculating the image according to the scale. The pore can be approximately a circular pore, and the diameter directly measured in the electron microscope image can be used as the pore diameter. The micro-nanopores in this application are pores formed by micro-nanofibers and micro-nanospheres. The micro-nanopores with a diameter of 10nm to 10μm can be, for example, micro-nanopores with a diameter of 10nm, 50nm, 100nm, 200nm, 300nm, 400nm, 500nm, 600nm, 700nm, 800nm, 900nm, 1μm, 2μm, 3μm, 4μm, 5μm, 6μm, 7μm, 8μm, 9μm, 10μm, etc.

[0076] In a specific embodiment, in the cooling product of the present application, the total volume of the micro-nano spheres with a diameter of 50nm to 5μm and the micro-nano pores with a diameter of 50nm to 5μm in the full solar spectrum high reflective film accounts for 10% to 90% of the volume of the full solar spectrum high reflective film, preferably 50% to 90%, and more preferably 70% to 90%.

[0077] In a specific embodiment, in the cooling product of the present application, the total volume of the micro-nanospheres with a diameter of 100nm to 1000nm and the micro-nanopores with a diameter of 100nm to 1000nm in the full solar spectrum high reflective film accounts for 10% to 90% of the volume of the full solar spectrum high reflective film, preferably 50% to 90%, and more preferably 70% to 90%.

[0078] In a specific embodiment, in the cooling product of the present application, the thickness of the full solar spectrum high reflective film is 10μm to 200μm, for example, it can be 10μm, 20μm, 30μm, 40μm, 50μm, 60μm, 70μm, 80μm, 90μm, 100μm, 110μm, 120μm, 130μm, 140μm, 150μm, 160μm, 170μm, 180μm, 190μm, 200μm, etc., preferably 20μm to 100μm, more preferably 40μm to 60μm.

[0079] In a specific embodiment, in the cooling product of the present application, the total volume of the micro-nano spheres with a diameter of 100nm to 1000nm and the micro-nano pores with a diameter of 100nm to 1000nm in the full solar spectrum high reflective film accounts for 70% to 90% of the volume of the full solar spectrum high reflective film, and the thickness of the full solar spectrum high reflective film is 40μm to 60μm.

[0080] In a specific embodiment, in the cooling product of the present application, the total volume of the micro-nano spheres with a diameter of 100nm to 1000nm and the micro-nano pores with a diameter of 100nm to 1000nm in the full solar spectrum high reflective film accounts for 50% to 90% of the volume of the full solar spectrum high reflective film, and the thickness of the full solar spectrum high reflective film is 20μm to 100μm.

[0081] In the present application, the materials of the micro-nano fibers and micro-nano spheres are the same.

[0082] In a specific embodiment, the materials of the micro-nano fibers and micro-nano spheres are selected from one or more of the following: polytetrafluoroethylene (PTFE), polyurethane (PU), polyethylene glycol (PEO), polyethylene (PE) and polyamide (PA).

[0083] In a preferred embodiment, the material of the micro-nano fibers and micro-nano spheres is polytetrafluoroethylene (PTFE) or polyurethane (PU).

[0084] In one embodiment, Figure 1 As shown, the cooling product of the present application is a high-reflection fabric for the entire solar spectrum, wherein the base material is a refrigeration base fabric 5 .

[0085] In a specific embodiment, the cooling base fabric is a fabric selected from a knitted structure, a woven structure or a non-woven structure, and the fabric comprises cooling fibers, and the cooling fibers comprise inorganic micro-nano particles and a polymer substrate.

[0086] In a specific embodiment, the cooling product of the present application is an outdoor textile, for example, a mask, wherein the base material is a fabric of a non-woven structure, the fabric includes cooling fibers, and the cooling fibers include inorganic micro-nanoparticles and a polymer substrate.

[0087] In one embodiment, the fabric is formed of cooling fibers formed of inorganic micro-nanoparticles and a polymer matrix.

[0088] In a specific embodiment, the inorganic micro-nanoparticles are selected from one or more of the following: titanium dioxide (TiO2), silicon dioxide (SiO2), zinc oxide (ZnO), silicon carbide (SiC), silicon nitride (Si3N4), zinc sulfide (ZnS), aluminum oxide (Al2O3), magnesium oxide (MgO), boron nitride (BN), barium sulfate (BaSO4), barium carbonate (BaCO3) and aluminum silicate (Al2SiO5), and the material of the polymer substrate includes one or more of the following: polylactic acid (PLA), polymethyl methacrylate (PMMA), polyethylene (PE), polypropylene (PP), polyamide (PA), polyethylene terephthalate (PET), polyvinylidene fluoride (PVDF), polyvinyl chloride (PVC), polystyrene (PS), polyvinyl alcohol (PVA), polyurethane (PU), polyacrylonitrile (PAN), cellulose, chitosan, poly(p-phenylene terephthalamide) and poly(p-benzamide). One or more.

[0089] In a preferred embodiment, the inorganic micro-nanoparticles are titanium dioxide (TiO2) or zinc oxide (ZnO), and the material of the polymer substrate is polylactic acid (PLA) or polymethyl methacrylate (PMMA).

[0090] In one embodiment, the particle size of the inorganic micro-nano particles is 0.3 to 5 μm, for example, 300 nm, 500 nm, 700 nm, 900 nm, 1000 nm, 1500 nm, 2000 nm, 2500 nm, 3000 nm, 3500 nm, 4000 nm, 4500 nm, 5000 nm, etc. Preferably, the particle size of the inorganic micro-nano particles is 400 to 1200 nm, for example, 400 nm, 500 nm, 550 nm, 600 nm, 700 nm, 800 nm, 900 nm, 1000 nm, 1100 nm, 1200 nm, etc. In this application, the particle size of the inorganic micro-nano particles refers to the average particle size obtained by electron microscopy, specifically the D50 median diameter, for example, the D50 median diameter is obtained by observing 500 particles.

[0091] In one embodiment, the refrigeration base fabric is composed of inorganic micro-nano particles and a polymer substrate, wherein the mass percentage of the inorganic micro-nano particles in the refrigeration base fabric is 1 wt.% to 80 wt.%, preferably 20 wt.% to 50 wt.%, more preferably 40 wt.% to 50 wt.%, for example, 1 wt.%, 5 wt.%, 10 wt.%, 15 wt.%, 20 wt.%, 25 wt.%, 30 wt.%, 35 wt.%, 40 wt.%, 45 wt.%, 50 wt.%, 55 wt.%, 60 wt.%, 65 wt.%, 70 wt.%, 75 wt.%, 80 wt.%, etc. In the present application, the mass percentage of the inorganic micro-nano particles in the refrigeration base fabric is controlled within the above range, and the resulting refrigeration base fabric has a high average solar reflectivity, high tensile strength, and excellent optical and mechanical properties.

[0092] In a specific embodiment, the full solar spectrum high reflective fabric of the present application has an average reflectivity greater than 0.9 in the ultraviolet light band, for example, it can be 0.9, 0.91, 0.92, 0.93, 0.94, 0.95, 0.96, 0.97, etc., its average reflectivity in the visible light band is greater than 0.9, for example, it can be 0.9, 0.91, 0.92, 0.93, 0.94, 0.95, 0.96, 0.97, etc., and its average reflectivity in the infrared light band is greater than 0.9, for example, it can be 0.9, 0.91, 0.92, 0.93, 0.94, 0.95, 0.96, 0.97, etc.

[0093] The percentage of radiation energy reflected by an object to the total radiation energy is called reflectivity. The "average reflectivity" refers to the weighted average of the reflectivity of each wavelength in a specified band (0.3-2.5μm), where the weight is the solar radiation intensity. The average reflectivity is measured by a UV-VIS-NIR spectrophotometer.

[0094] In a specific embodiment, the hydrophobic angle of the full solar spectrum high-reflective fabric of the present application is greater than 95°, for example, it can be 95°, 96°, 97°, 98°, 99°, 100°, 101°, 102°, 103°, 104°, 105°, 106°, 107°, 108°, etc.

[0095] In this application, the full solar spectrum high reflective film is the outward side of the full solar spectrum high reflective fabric, the cooling base fabric is the inward side, and the hydrophobic angle of the full solar spectrum high reflective fabric is tested on the side of the full solar spectrum high reflective film.

[0096] The "hydrophobic angle" refers to the angle greater than 90° between the solid-liquid interface, through the liquid interior, and the gas-liquid interface at the interface between solid, liquid, and gas. At this point, the solid surface is hydrophobic, meaning liquids do not wet the solid easily and migrate across it. The hydrophobic angle is determined in this application using the maximum droplet height method.

[0097] The present application also provides a method for preparing a full solar spectrum highly reflective fabric, which comprises:

[0098] Step 1: Prepare refrigeration base fabric;

[0099] Step 2: Prepare a high-reflection film for the entire solar spectrum;

[0100] Step three: compounding the full solar spectrum high reflective film on the refrigeration base cloth to obtain the full solar spectrum high reflective fabric.

[0101] In a specific embodiment, in the preparation method of the present application, in step one, inorganic micro-nanoparticles and a polymer substrate are mixed to obtain a composite material, the composite material is made into a cooling fiber, and the cooling fiber is made into a cooling fabric to obtain the cooling base cloth, and the cooling base cloth is a cooling fabric selected from a knitted structure, a woven structure or a non-woven structure.

[0102] In a specific embodiment, the preparation method of the present application, the inorganic micro-nanoparticles are selected from one or more of the following: titanium dioxide (TiO2), silicon dioxide (SiO2), zinc oxide (ZnO), silicon carbide (SiC), silicon nitride (Si3N4), zinc sulfide (ZnS), aluminum oxide (Al2O3), magnesium oxide (MgO), boron nitride (BN), barium sulfate (BaSO4), barium carbonate (BaCO3) and aluminum silicate (Al2SiO5); the material of the polymer substrate includes one or more of the following: polylactic acid (PLA), polymethyl methacrylate (PMMA), polyethylene (PE), polypropylene (PP), polyamide (PA), polyethylene terephthalate (PET), polyvinylidene fluoride (PVDF), polyvinyl chloride (PVC), polystyrene (PS), polyvinyl alcohol (PVA), polyurethane (PU), polyacrylonitrile (PAN), cellulose, chitosan, poly(p-phenylene terephthalamide) and poly(p-benzamide);

[0103] In a specific embodiment, in the preparation method of the present application, the inorganic micro-nanoparticles are titanium dioxide (TiO2) or zinc oxide (ZnO), and the material of the polymer substrate is polylactic acid (PLA) or polymethyl methacrylate (PMMA).

[0104] In a specific embodiment, the preparation method of the present application utilizes one or more selected from melt spinning, wet spinning, hot drawing, electrospinning, and melt-blown spinning, preferably utilizing melt spinning or hot drawing, to make the composite material into a cooling fiber.

[0105] "Melt spinning" is a forming method that uses polymer melt as raw material and adopts melt spinning machine to spin.

[0106] "Wet spinning" is a chemical fiber spinning method in which a polymer is dissolved in a solvent, ejected into a thin stream through a spinneret, and then enters a coagulation bath to form a fiber.

[0107] "Hot drawing" refers to a method in which a partial area of ​​a preform rod is heated by a heat source to soften the preform rod, and then the preform rod is manually or mechanically stretched from one or both ends of the heated area.

[0108] Electrospinning is a method of spinning fibers by spraying and stretching a polymer solution or melt under the action of electrostatics.

[0109] Meltblown spinning refers to a spinning method that uses high-speed hot air flow to rapidly stretch and solidify the newly extruded polymer melt. Its advantage is that the process is short and non-woven fabrics can be directly spun.

[0110] In a specific embodiment, in the preparation method of the present application, in the step 2, the full solar spectrum high reflective film is prepared by biaxial stretching or electrospinning using materials of micro-nano fibers and micro-nano balls.

[0111] The "biaxial stretching method" refers to a method in which the raw materials are melted and extruded to form a thicker film, and then heated within an appropriate temperature range for longitudinal and transverse stretching, and then heat-set and cool under tension before post-processing.

[0112] In a specific embodiment, the preparation method of the present application, the solar spectrum high reflective film is formed by winding and interweaving multiple micro-nano fibers and has micro-nano pores; the micro-nano fibers are connected by micro-nano balls; the total volume of the micro-nano balls with a diameter of 10nm to 10μm and the micro-nano pores with a diameter of 10nm to 10μm in the full solar spectrum high reflective film accounts for 10% to 90% of the volume of the full solar spectrum high reflective film, for example, it can be 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, etc., preferably 50% to 90%, more preferably 70% to 90%.

[0113] In the present application, the micro-nanospheres with a diameter of 10 nm to 10 μm can be, for example, micro-nanospheres with a diameter of 10 nm, 50 nm, 100 nm, 200 nm, 300 nm, 400 nm, 500 nm, 600 nm, 700 nm, 800 nm, 900 nm, 1 μm, 2 μm, 3 μm, 4 μm, 5 μm, 6 μm, 7 μm, 8 μm, 9 μm, 10 μm, etc.

[0114] In the present application, the micro-nano pores with a diameter of 10 nm to 10 μm can be, for example, micro-nano pores with a diameter of 10 nm, 50 nm, 100 nm, 200 nm, 300 nm, 400 nm, 500 nm, 600 nm, 700 nm, 800 nm, 900 nm, 1 μm, 2 μm, 3 μm, 4 μm, 5 μm, 6 μm, 7 μm, 8 μm, 9 μm, 10 μm, etc.

[0115] In a specific embodiment, in the preparation method of the present application, the total volume of the micro-nano spheres with a diameter of 50nm to 5μm and the micro-nano pores with a diameter of 50nm to 5μm in the full solar spectrum high reflective film accounts for 10% to 90% of the volume of the full solar spectrum high reflective film, preferably 50% to 90%, and more preferably 70% to 90%.

[0116] In a specific embodiment, in the full solar spectrum high reflective fabric of the present application, the total volume of the micro-nano spheres with a diameter of 100nm to 1000nm and the micro-nano pores with a diameter of 100nm to 1000nm in the full solar spectrum high reflective film accounts for 10% to 90% of the volume of the full solar spectrum high reflective film, preferably 50% to 90%, and more preferably 70% to 90%.

[0117] In a specific embodiment, in the preparation method of the present application, the thickness of the full solar spectrum high reflective film is 10μm to 200μm, for example, it can be 10μm, 20μm, 30μm, 40μm, 50μm, 60μm, 70μm, 80μm, 90μm, 100μm, 110μm, 120μm, 130μm, 140μm, 150μm, 160μm, 170μm, 180μm, 190μm, 200μm, etc., preferably 20μm to 100μm, more preferably 40μm to 60μm.

[0118] In a specific embodiment, in the preparation method of the present application, in a specific embodiment, in the full solar spectrum high-reflection fabric of the present application, the total volume of the micro-nano spheres with a diameter of 100nm to 1000nm and the micro-nano pores with a diameter of 100nm to 1000nm in the full solar spectrum high-reflection film accounts for 70% to 90% of the volume of the full solar spectrum high-reflection film, and the thickness of the full solar spectrum high-reflection film is 40μm to 60μm.

[0119] In a specific embodiment, in the preparation method of the present application, in a specific embodiment, in the full solar spectrum high-reflection fabric of the present application, the total volume of the micro-nano spheres with a diameter of 100nm to 1000nm and the micro-nano pores with a diameter of 100nm to 1000nm in the full solar spectrum high-reflection film accounts for 50% to 90% of the volume of the full solar spectrum high-reflection film, and the thickness of the full solar spectrum high-reflection film is 20μm to 100μm.

[0120] In the present application, micro-nanospheres with a diameter of 10 nm to 10 μm and micro-nanopores with a diameter of 10 nm to 10 μm can act together as scatterers to reflect solar radiation. The present application does not limit the respective volumes of the micro-nanospheres with a diameter of 10 nm to 10 μm and the micro-nanopores with a diameter of 10 nm to 10 μm.

[0121] In the present application, the materials of the micro-nano fibers and micro-nano spheres are the same.

[0122] In a specific embodiment, the materials of the micro-nano fibers and micro-nano spheres are selected from one or more of the following: polytetrafluoroethylene (PTFE), polyurethane (PU), polyethylene glycol (PEO), polyethylene (PE) and polyamide (PA).

[0123] In a preferred embodiment, the material of the micro-nano fibers and micro-nano spheres is polytetrafluoroethylene (PTFE) or polyurethane (PU).

[0124] In a specific embodiment, the preparation method of the present application, after the step of preparing the full solar spectrum high reflective film, uses a dot glue lamination method or a hot pressing composite method to composite the full solar spectrum high reflective film on the refrigeration base cloth to obtain the full solar spectrum high reflective fabric.

[0125] The "glue-dotting method" refers to a method of evenly placing a certain amount of hot-melt glue on the base fabric, covering it with a reflective film, heating it at a low temperature until the glue melts, and then bonding the double-layer structure after cooling.

[0126] The "hot pressing lamination method" refers to a method in which a reflective film is placed on a base fabric, and then heated and pressed at high temperature to bond the double-layer structure together.

[0127] The full solar spectrum high-reflection fabric of the present application is sequentially provided with a full solar spectrum high-reflection film and a cooling base fabric from the outside to the inside, and the thickness of the full solar spectrum high-reflection film, the total volume percentage of micro-nanospheres and micro-nanopores with diameters within a specific range in the full solar spectrum high-reflection film, and the types of inorganic micro-nanoparticles and polymer substrates in the cooling base fabric are controlled respectively, so that the prepared full solar spectrum high-reflection fabric has an average reflectivity of more than 0.9 in the ultraviolet light band, the visible light band, and the infrared light band, and the average reflectivity in the ultraviolet light band can even reach 0.95, the average reflectivity in the visible light band can even reach 0.95, and the average reflectivity in the infrared light band can even reach 0.95; the tensile strength is more than 450N, and can even reach more than 500N, and the hydrophobic angle is more than 100°, and can even reach 103°. The full solar spectrum high-reflection fabric prepared by the present application has full solar spectrum high reflectivity, good mechanical properties, and waterproof and anti-fouling properties.

[0128] Example

[0129] In order to better illustrate the technical solutions and advantages of the present application, the present invention will be further described below with reference to specific embodiments. The process parameters, raw materials, etc. not described in detail in the present invention are all carried out according to conventional technical means in the art.

[0130] In the following examples, the names and sources of the raw materials are as follows:

[0131] Titanium dioxide (Pan Neng Tuo, W550)

[0132] Polylactic acid (NatureWorks)

[0133] Polymethyl methacrylate (Prospector)

[0134] Polyethylene (LyondellBasell)

[0135] 10μm polytetrafluoroethylene outer film (Longfa New Material, SNFZM-0710)

[0136] 20μm polytetrafluoroethylene outer film (Longfa New Material, SNFZM-1520)

[0137] 40μm, 50μm and 60μm polytetrafluoroethylene outer membrane (Longfa New Material, SNFZM-4060)

[0138] During the experiment, an outer layer membrane of a desired thickness is selected and measured as needed to screen out an outer layer membrane having micro-nanospheres and micro-nanopores with a total volume ratio within a specific range of diameters required for each embodiment.

[0139] For a 100μm polytetrafluoroethylene outer membrane, based on the required proportion Z of the total volume of micro-nanospheres and micro-nanopores with diameters within a specific range in the outer membrane, we first screened out two polytetrafluoroethylene outer membranes, both of which were 50μm thick and had a total volume of micro-nanospheres and micro-nanopores with diameters within a specific range accounting for Z. We then used the glue dispensing method to bond the two outer membranes together to prepare the required 100μm polytetrafluoroethylene outer membrane.

[0140] For the 200μm polytetrafluoroethylene outer membrane, according to the required proportion V of the total volume of micro-nanospheres and micro-nanopores with diameters within a specific range in the outer membrane, we first screened out four polytetrafluoroethylene outer membranes with a thickness of 50μm and a total volume of micro-nanospheres and micro-nanopores with diameters within a specific range accounting for V. We then used the dispensing glue method to bond the two outer membranes together to prepare the required 200μm polytetrafluoroethylene outer membrane.

[0141] Example 1

[0142] The full solar spectrum high reflective fabric of this embodiment was prepared according to the following method:

[0143] (1) Preparation of refrigeration base fabric:

[0144] 400g of titanium dioxide particles and 600g of polylactic acid substrate were melted at 210°C to prepare a uniformly mixed composite material, and then the composite material was wound using a melt spinning method to obtain cooling fibers. Finally, the cooling fibers were woven into a cooling base cloth with warp and weft interwoven distribution.

[0145] (2) Screening the full solar spectrum high reflective film (outer film), and compounding the outer film on the refrigeration base cloth to obtain the full solar spectrum high reflective fabric:

[0146] The SNFZM-1520 outer membrane (20 μm thick) was selected, and scanning electron microscopy was used to screen out micro-nanospheres with diameters ranging from 50 nm to 5 μm, and the total volume of micro-nanopores in the outer membrane accounted for 50%. Subsequently, hot melt adhesive was evenly applied to the cooling base fabric, and the outer membrane was covered on the base fabric. The outer membrane and the cooling base fabric were heated to 140°C under a pressure of 40 kPa, and the outer membrane and the cooling base fabric were tightly bonded to produce a highly reflective fabric with a full solar spectrum.

[0147] In this embodiment, the total volume of the outer membrane is the sum of the following three: (1) the total volume of micro-nanospheres and micro-nanopores with diameters in the range of 50 nm to 5 μm; (2) the total volume of micro-nanospheres and micro-nanopores with diameters outside the range of 50 nm to 5 μm; and (3) the total volume of micro-nanofibers.

[0148] Example 2

[0149] (1) Preparation of refrigeration base fabric:

[0150] 400g of zinc oxide particles and 600g of polymethyl methacrylate substrate were melted at 290°C to prepare a uniformly mixed composite material, and then the composite material was hot-pressed to prepare a composite material preform rod. Cooling fibers were obtained by a hot drawing method, and finally the cooling fibers were woven into a cooling base cloth with warp and weft interwoven distribution.

[0151] (2) Screening the outer film and compounding the outer film on the refrigeration base fabric to obtain a full solar spectrum high reflective fabric:

[0152] A 50μm-thick outer film model SNFZM-4060 was selected. Scanning electron microscopy was used to screen out two outer films with micro-nanospheres and micro-nanopores with diameters ranging from 50nm to 5μm, each comprising 60% of the total volume. The two outer films were then bonded together using a dispensing glue lamination method to create an outer film with a thickness of 100μm. Hot melt adhesive was evenly applied to a cooling base fabric, and the 100μm outer film was then applied to the base fabric. The film was then heated to 140°C under a pressure of 40kPa, and the 100μm outer film and the cooling base fabric were tightly bonded to produce a fabric with full solar spectrum high reflectivity.

[0153] In this embodiment, the total volume of the outer membrane is the sum of the following three: (1) the total volume of micro-nanospheres and micro-nanopores with diameters in the range of 50 nm to 5 μm; (2) the total volume of micro-nanospheres and micro-nanopores with diameters outside the range of 50 nm to 5 μm; and (3) the total volume of micro-nanofibers.

[0154] Example 3

[0155] (1) Preparation of refrigeration base fabric:

[0156] 500g of titanium dioxide particles and 500g of polylactic acid substrate were melted at 210°C to prepare a uniformly mixed composite material, and then the composite material was wound using a melt spinning method to obtain cooling fibers. Finally, the cooling fibers were woven into a cooling base cloth with warp and weft interwoven distribution.

[0157] (2) Screening the outer film and compounding the outer film on the refrigeration base fabric to obtain a full solar spectrum high reflective fabric:

[0158] The SNFZM-4060 outer film (40 μm thick) was selected, and scanning electron microscopy was used to screen for micro-nanospheres with diameters ranging from 100 nm to 1000 nm, with a total volume of micro-nanopores accounting for 70%. Hot melt adhesive was evenly applied to a cooling base fabric, and the outer film was then applied to the base fabric. The film was then heated to 140°C under a pressure of 40 kPa, and the outer film and cooling base fabric were tightly bonded to produce a highly reflective fabric with a full solar spectrum.

[0159] In this embodiment, the total volume of the outer membrane is the sum of the following three: (1) the total volume of micro-nanospheres and micro-nanopores with diameters between 100 nm and 1000 nm; (2) the total volume of micro-nanospheres and micro-nanopores with diameters outside the range of 100 nm to 1000 nm; and (3) the total volume of micro-nanofibers.

[0160] Example 4

[0161] (1) Preparation of refrigeration base fabric:

[0162] 500g of titanium dioxide particles and 500g of polylactic acid substrate were melted at 210°C to prepare a uniformly mixed composite material, and then the composite material was wound using a melt spinning method to obtain cooling fibers. Finally, the cooling fibers were woven into a cooling base cloth with warp and weft interwoven distribution.

[0163] (2) Screening the outer film and compounding the outer film on the refrigeration base fabric to obtain a full solar spectrum high reflective fabric:

[0164] The SNFZM-4060 outer membrane (60 μm thick) was selected, and scanning electron microscopy was used to screen out micro-nanospheres with diameters ranging from 100 nm to 1000 nm, with a total volume fraction of 90% of the membrane. Hot melt adhesive was evenly applied to a cooling base fabric, and the outer membrane was then applied to the base fabric. The fabric was heated to 140°C under a pressure of 40 kPa, and the outer membrane and cooling base fabric were tightly bonded to produce a highly reflective fabric with a full solar spectrum.

[0165] In this embodiment, the total volume of the outer membrane is the sum of the following three: (1) the total volume of micro-nanospheres and micro-nanopores with diameters between 100 nm and 1000 nm; (2) the total volume of micro-nanospheres and micro-nanopores with diameters outside the range of 100 nm to 1000 nm; and (3) the total volume of micro-nanofibers.

[0166] Example 5

[0167] (1) Preparation of refrigeration base fabric:

[0168] 400g of titanium dioxide particles and 600g of polylactic acid substrate were melted at 210°C to prepare a uniformly mixed composite material, and then the composite material was wound using a melt spinning method to obtain cooling fibers. Finally, the cooling fibers were woven into a cooling base cloth with warp and weft interwoven distribution.

[0169] (2) Screening the outer film and compounding the outer film on the refrigeration base fabric to obtain a full solar spectrum high reflective fabric:

[0170] The SNFZM-0710 outer membrane (10 μm thick) was selected, and scanning electron microscopy was used to screen out micro-nanospheres with diameters ranging from 50 nm to 5 μm, and the total volume of micro-nanopores in the outer membrane accounted for 50%. Hot melt adhesive was evenly applied to the cooling base fabric, and the outer membrane was covered on the base fabric. The outer membrane and the cooling base fabric were heated to 140°C under a pressure of 40 kPa, and the outer membrane and the cooling base fabric were tightly bonded to produce a highly reflective fabric with a full solar spectrum.

[0171] In this embodiment, the total volume of the outer membrane is the sum of the following three: (1) the total volume of micro-nanospheres and micro-nanopores with diameters in the range of 50 nm to 5 μm; (2) the total volume of micro-nanospheres and micro-nanopores with diameters outside the range of 50 nm to 5 μm; and (3) the total volume of micro-nanofibers.

[0172] Example 6

[0173] (1) Preparation of refrigeration base fabric:

[0174] 400g of titanium dioxide particles and 600g of polylactic acid substrate were melted at 210°C to prepare a uniformly mixed composite material, and then the composite material was wound using a melt spinning method to obtain cooling fibers. Finally, the cooling fibers were woven into a cooling base cloth with warp and weft interwoven distribution.

[0175] (2) Screening the outer film and compounding the outer film on the refrigeration base fabric to obtain a full solar spectrum high reflective fabric:

[0176] A 50μm-thick outer membrane, model SNFZM-4060, was selected. Scanning electron microscopy was used to screen out four outer membranes containing micro-nanospheres and micro-nanopores with diameters ranging from 50nm to 5μm, each comprising 50% of the total volume. These four outer membranes were then bonded together using a dispensing glue lamination method to create an outer membrane with a thickness of 200μm. Hot melt adhesive was evenly applied to a cooling base fabric, and the 200μm outer membrane was applied to the base fabric. The fabric was then heated to 140°C under a pressure of 40kPa, and the 200μm outer membrane and the cooling base fabric were tightly bonded to create a fabric with full solar spectrum high reflectivity.

[0177] In this embodiment, the total volume of the outer membrane is the sum of the following three: (1) the total volume of micro-nanospheres and micro-nanopores with diameters in the range of 50 nm to 5 μm; (2) the total volume of micro-nanospheres and micro-nanopores with diameters outside the range of 50 nm to 5 μm; and (3) the total volume of micro-nanofibers.

[0178] Example 7

[0179] (1) Preparation of refrigeration base fabric:

[0180] 400g of titanium dioxide particles and 600g of polylactic acid substrate were melted at 210°C to prepare a uniformly mixed composite material, and then the composite material was wound using a melt spinning method to obtain cooling fibers. Finally, the cooling fibers were woven into a cooling base cloth with warp and weft interwoven distribution.

[0181] (2) Screening the outer film and compounding the outer film on the refrigeration base fabric to obtain a full solar spectrum high reflective fabric:

[0182] A SNFZM-4060 outer film (both 50μm thick) was selected. Scanning electron microscopy was used to screen out two outer films containing micro-nanospheres with diameters between 50nm and 5μm and micro-nanopores with a total volume ratio of 50%. The two outer films were then bonded together using a dispensing glue lamination method to create an outer film with a thickness of 100μm. Hot melt adhesive was evenly applied to a cooling base fabric, and the 100μm outer film was placed over the base fabric. The film was then heated to 140°C under a pressure of 40kPa, and the 100μm outer film and the cooling base fabric were tightly bonded to produce a highly reflective fabric with a full solar spectrum.

[0183] In this embodiment, the total volume of the outer membrane is the sum of the following three: (1) the total volume of micro-nanospheres and micro-nanopores with diameters in the range of 50 nm to 5 μm; (2) the total volume of micro-nanospheres and micro-nanopores with diameters outside the range of 50 nm to 5 μm; and (3) the total volume of micro-nanofibers.

[0184] Example 8

[0185] (1) Preparation of refrigeration base fabric:

[0186] 400g of titanium dioxide particles and 600g of polylactic acid substrate were melted at 210°C to prepare a uniformly mixed composite material, and then the composite material was wound using a melt spinning method to obtain cooling fibers. Finally, the cooling fibers were woven into a cooling base cloth with warp and weft interwoven distribution.

[0187] (2) Screening the outer film and compounding the outer film on the refrigeration base fabric to obtain a full solar spectrum high reflective fabric:

[0188] The SNFZM-4060 outer film (40 μm thick) was selected. Scanning electron microscopy was used to screen out micro-nanospheres with diameters ranging from 50 nm to 5 μm, and the total volume of micro-nanopores in the outer film accounted for 50%. Hot melt adhesive was evenly applied to the cooling base fabric, and the outer film was covered on the base fabric. The outer film and the cooling base fabric were heated to 140°C under a pressure of 40 kPa, and the outer film and the cooling base fabric were tightly bonded to produce a highly reflective fabric with a full solar spectrum.

[0189] In this embodiment, the total volume of the outer membrane is the sum of the following three: (1) the total volume of micro-nanospheres and micro-nanopores with diameters in the range of 50 nm to 5 μm; (2) the total volume of micro-nanospheres and micro-nanopores with diameters outside the range of 50 nm to 5 μm; and (3) the total volume of micro-nanofibers.

[0190] Example 9

[0191] (1) Preparation of refrigeration base fabric:

[0192] 400g of titanium dioxide particles and 600g of polylactic acid substrate were melted at 210°C to prepare a uniformly mixed composite material, and then the composite material was wound using a melt spinning method to obtain cooling fibers. Finally, the cooling fibers were woven into a cooling base cloth with warp and weft interwoven distribution.

[0193] (2) Screening the outer film and compounding the outer film on the refrigeration base fabric to obtain a full solar spectrum high reflective fabric:

[0194] The SNFZM-4060 outer membrane (60 μm thick) was selected, and scanning electron microscopy was used to screen out micro-nanospheres with diameters ranging from 50 nm to 5 μm, and the total volume of micro-nanopores in the outer membrane accounted for 50%. Hot melt adhesive was evenly applied to the cooling base fabric, and the outer membrane was covered on the base fabric. The outer membrane and the cooling base fabric were heated to 140°C under a pressure of 40 kPa, and the outer membrane and the cooling base fabric were tightly bonded to produce a highly reflective fabric with a full solar spectrum.

[0195] In this embodiment, the total volume of the outer membrane is the sum of the following three: (1) the total volume of micro-nanospheres and micro-nanopores with diameters in the range of 50 nm to 5 μm; (2) the total volume of micro-nanospheres and micro-nanopores with diameters outside the range of 50 nm to 5 μm; and (3) the total volume of micro-nanofibers.

[0196] Example 10

[0197] The preparation method of the full solar spectrum high-reflection fabric of this embodiment refers to Example 4. The difference from Example 4 is that the total volume of the micro-nano spheres with a diameter of 100nm to 1000nm and the micro-nano pores with a diameter of 100nm to 1000nm in the full solar spectrum high-reflection film accounts for 80% of the volume of the full solar spectrum high-reflection film.

[0198] Example 11

[0199] The preparation method of the full solar spectrum high-reflection fabric of this embodiment refers to Example 4. The difference from Example 4 is that the total volume of the micro-nano spheres with a diameter of 100nm to 1000nm and the micro-nano pores with a diameter of 100nm to 1000nm in the full solar spectrum high-reflection film accounts for 70% of the volume of the full solar spectrum high-reflection film.

[0200] Example 12

[0201] The preparation method of the full solar spectrum high-reflection fabric of this embodiment refers to Example 4. The difference from Example 4 is that the total volume of the micro-nano spheres with a diameter of 100nm to 1000nm and the micro-nano pores with a diameter of 100nm to 1000nm in the full solar spectrum high-reflection film accounts for 50% of the volume of the full solar spectrum high-reflection film.

[0202] Example 13

[0203] The preparation method of the full solar spectrum high-reflection fabric of this embodiment refers to Example 4. The difference from Example 4 is that the total volume of the micro-nano spheres with a diameter of 100nm to 1000nm and the micro-nano pores with a diameter of 100nm to 1000nm in the full solar spectrum high-reflection film accounts for 20% of the volume of the full solar spectrum high-reflection film.

[0204] Example 14

[0205] The preparation method of the full solar spectrum high-reflection fabric of this embodiment refers to Example 1. The difference from Example 1 is that the total volume of the micro-nano spheres with a diameter of 10nm to 10μm and the micro-nano pores with a diameter of 10nm to 10μm in the full solar spectrum high-reflection film accounts for 50% of the volume of the full solar spectrum high-reflection film.

[0206] Example 15

[0207] The preparation method of the full solar spectrum high reflective fabric of this embodiment refers to Example 14, and the difference from Example 14 is that the doping mass fraction of the inorganic micro-nano particles is 20%.

[0208] Example 16

[0209] The preparation method of the full solar spectrum high reflective fabric of this embodiment refers to Example 14, and the difference from Example 14 is that the doping mass fraction of the inorganic micro-nano particles is 80%.

[0210] Comparative Example 1

[0211] The only difference between Comparative Example 1 and Example 1 is that Comparative Example 1 does not contain an outer film.

[0212] Example 17

[0213] (1) Select commercially available WELLDAY / Weide Medical disposable medical surgical masks as the cooling base fabric.

[0214] (2) preparing an outer layer film, and compounding the outer layer film on the outer layer of the refrigeration base cloth to obtain a cooling mask.

[0215] The outer membrane, made of polytetrafluoroethylene (PTFE), was prepared using electrospinning. The membrane had a thickness of 60 μm, with micro-nanospheres and micro-nanopores with diameters ranging from 100 nm to 1000 nm accounting for 90% of the membrane's volume. Hot melt adhesive was evenly applied to the outermost layer of the cooling mask, and the PTFE membrane was then placed over the base fabric. The mask was heated to 140°C under a pressure of 40 kPa, and the PTFE membrane and cooling base fabric were tightly bonded to form the cooling mask.

[0216] Comparative Example 2

[0217] The only difference between Comparative Example 2 and Example 17 is that Comparative Example 2 does not contain an outer film.

[0218] The parameters and performance of the full solar spectrum high reflective fabrics and masks of each embodiment and comparative example are shown in Table 1 below.

[0219] Table 1

[0220]

[0221]

[0222]

[0223] The above description is merely a preferred embodiment of the present application and does not constitute any other limitation to the present application. Any person skilled in the art may utilize the above-disclosed technical content to modify or modify the present application into equivalent embodiments with equivalent variations. However, any simple modifications, equivalent variations, and modifications to the above embodiments that do not depart from the technical content of the present application and are based on the technical essence of the present application shall still fall within the scope of protection of the present application.

Claims

1. A cooling product, characterized in that: The invention comprises a full solar spectrum high reflective film with micro-nano pores formed by winding and interweaving a plurality of micro-nano fibers and a base material; the micro-nano fibers are connected by micro-nano balls; The total volume of the micro-nanospheres with a diameter of 100 nm to 1000 nm and the micro-nanopores with a diameter of 100 nm to 1000 nm in the full solar spectrum high reflective film accounts for 70% to 90% of the volume of the full solar spectrum high reflective film; The thickness of the full solar spectrum high reflective film is 40 μm to 60 μm; The materials of the micro-nano fibers and micro-nano balls are polytetrafluoroethylene (PTFE) or polyurethane (PU); The base material is a refrigeration base fabric, which is composed of inorganic micro-nano particles and a polymer base. The refrigeration base fabric contains 40wt.% to 50wt.% of inorganic micro-nano particles.

2. The cooling product according to claim 1, characterized in that: The refrigeration base fabric is a fabric selected from a knitted structure, a woven structure or a non-woven fabric structure.

3. The cooling product according to claim 1 or 2, characterized in that: The cooling product is an outdoor textile, wherein the refrigeration base fabric is a fabric with a non-woven fabric structure.

4. The cooling product according to claim 3, characterized in that: The outdoor textile is a mask.

5. The cooling product according to claim 2, characterized in that: The fabric is formed of cooling fibers, which are formed of inorganic micro-nano particles and a polymer matrix.

6. The cooling product according to claim 1, characterized in that: The inorganic micro-nanoparticles are selected from one or more of the following: titanium dioxide TiO2, silicon dioxide SiO2, zinc oxide ZnO, silicon carbide SiC, silicon nitride Si3N4, zinc sulfide ZnS, aluminum oxide Al2O3, magnesium oxide MgO, boron nitride BN, barium sulfate BaSO4, barium carbonate BaCO3 and aluminum silicate Al2SiO5.

7. The cooling product according to claim 1, characterized in that: The inorganic micro-nano particles have a particle size of 0.1 μm to 25 μm.

8. The cooling product according to claim 1, characterized in that: The particle size of the inorganic micro-nano particles is 0.3 μm to 5 μm.

9. The cooling product according to claim 1, characterized in that: The particle size of the inorganic micro-nano particles is 0.4 μm to 1.2 μm.

10. The cooling product according to claim 1, characterized in that: The inorganic micro-nano particles are titanium dioxide TiO2 or zinc oxide ZnO.

11. The cooling product according to claim 5, characterized in that: The material of the polymer substrate includes one or more of the following: polylactic acid PLA, polymethyl methacrylate PMMA, polyethylene PE, polypropylene PP, polyamide PA, polyethylene terephthalate PET, polyvinylidene fluoride PVDF, polyvinyl chloride PVC, polystyrene PS, polyvinyl alcohol PVA, polyurethane PU, polyacrylonitrile PAN, cellulose, chitosan, poly(p-phenylene terephthalamide) and poly(p-benzamide).

12. The cooling product according to claim 5, characterized in that: The material of the polymer substrate is polylactic acid PLA or polymethyl methacrylate PMMA.

13. A method for preparing a full solar spectrum highly reflective fabric, characterized in that: It includes the following steps: preparing a refrigeration base fabric; Preparation of high reflective films for the entire solar spectrum; Compounding the full solar spectrum high reflective film on the refrigeration base fabric to obtain the full solar spectrum high reflective fabric; The full solar spectrum high reflective film is formed by a plurality of micro-nano fibers intertwined and interwoven and has micro-nano pores; the micro-nano fibers are connected by micro-nano balls; The total volume of the micro-nanospheres with a diameter of 100nm to 1000nm and the micro-nanopores with a diameter of 100nm to 1000nm in the full solar spectrum high reflective film accounts for 70% to 90% of the volume of the full solar spectrum high reflective film; The thickness of the full solar spectrum high reflective film is 40 μm to 60 μm; The materials of the micro-nano fibers and micro-nano balls are polytetrafluoroethylene (PTFE) or polyurethane (PU); The refrigeration base fabric is composed of inorganic micro-nano particles and a polymer substrate, and the mass percentage of the inorganic micro-nano particles in the refrigeration base fabric is 40wt.% to 50wt.%.

14. The preparation method according to claim 13, characterized in that In the step of preparing the refrigeration base cloth, inorganic micro-nano particles and a polymer substrate are mixed to obtain a composite material, the composite material is made into cooling fibers, and the cooling fibers are then made into fabric to obtain the refrigeration base cloth.

15. The preparation method according to claim 13, characterized in that The refrigeration base fabric is a fabric selected from a knitted structure, a woven structure or a non-woven fabric structure.

16. The preparation method according to claim 14, characterized in that The inorganic micro-nanoparticles are selected from one or more of the following: titanium dioxide TiO2, silicon dioxide SiO2, zinc oxide ZnO, silicon carbide SiC, silicon nitride Si3N4, zinc sulfide ZnS, aluminum oxide Al2O3, magnesium oxide MgO, boron nitride BN, barium sulfate BaSO4, barium carbonate BaCO3 and aluminum silicate Al2SiO5.

17. The preparation method according to claim 14, characterized in that The inorganic micro-nano particles have a particle size of 0.1 μm to 25 μm.

18. The preparation method according to claim 14, characterized in that The particle size of the inorganic micro-nano particles is 0.3 μm to 5 μm.

19. The preparation method according to claim 14, characterized in that The particle size of the inorganic micro-nano particles is 0.4 μm to 1.2 μm.

20. The preparation method according to claim 14, characterized in that The inorganic micro-nano particles are titanium dioxide TiO2 or zinc oxide ZnO.

21. The preparation method according to claim 14, characterized in that The material of the polymer substrate includes one or more of the following: polylactic acid PLA, polymethyl methacrylate PMMA, polyethylene PE, polypropylene PP, polyamide PA, polyethylene terephthalate PET, polyvinylidene fluoride PVDF, polyvinyl chloride PVC, polystyrene PS, polyvinyl alcohol PVA, polyurethane PU, polyacrylonitrile PAN, cellulose, chitosan, poly(p-phenylene terephthalamide) and poly(p-benzamide).

22. The preparation method according to claim 14, characterized in that The material of the polymer substrate is polylactic acid PLA or polymethyl methacrylate PMMA.

23. The preparation method according to claim 14, characterized in that The composite material is made into cooling fiber by utilizing one or more methods selected from melt spinning, wet spinning, hot drawing, electrostatic spinning and melt-blowing spinning.

24. The preparation method according to claim 14, characterized in that The composite material is made into cooling fiber by using a melt spinning method or a hot drawing method.

25. The preparation method according to claim 13, characterized in that In the step of preparing the full solar spectrum high reflective film, the full solar spectrum high reflective film is prepared by using micro-nano fibers and micro-nano balls through a biaxial stretching method or an electrostatic spinning method.

26. The preparation method according to claim 13, characterized in that After the step of preparing the full solar spectrum high reflective film, the full solar spectrum high reflective film is compounded on the refrigeration base cloth by using a dispensing lamination method or a hot pressing lamination method to obtain the full solar spectrum high reflective fabric.

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