CN110815985A - Radiation refrigeration fabric and application thereof - Google Patents
Radiation refrigeration fabric and application thereof Download PDFInfo
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- CN110815985A CN110815985A CN201911086548.1A CN201911086548A CN110815985A CN 110815985 A CN110815985 A CN 110815985A CN 201911086548 A CN201911086548 A CN 201911086548A CN 110815985 A CN110815985 A CN 110815985A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/12—Layered products comprising a layer of synthetic resin next to a fibrous or filamentary layer
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/28—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42
- B32B27/281—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42 comprising polyimides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
- B32B27/308—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising acrylic (co)polymers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
- B32B27/325—Layered products comprising a layer of synthetic resin comprising polyolefins comprising polycycloolefins
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/38—Layered products comprising a layer of synthetic resin comprising epoxy resins
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/40—Layered products comprising a layer of synthetic resin comprising polyurethanes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
- B32B2262/02—Synthetic macromolecular fibres
- B32B2262/0276—Polyester fibres
- B32B2262/0284—Polyethylene terephthalate [PET] or polybutylene terephthalate [PBT]
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
- B32B2262/06—Vegetal fibres
- B32B2262/062—Cellulose fibres, e.g. cotton
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Abstract
The invention discloses a radiation refrigeration fabric and application thereof, and the radiation refrigeration fabric comprises a flexible substrate layer and a functional layer which are arranged in a laminated manner, wherein the thickness of the functional layer is 10-200 mu m, the functional layer comprises a resin substrate and functional fillers dispersed in the resin substrate, the mass fraction of the functional fillers in the functional layer is not more than 20%, the emissivity of the radiation refrigeration fabric in a wave band of 7-14 mu m is not less than 80%, the reflectivity of the radiation refrigeration fabric in a wave band of 300-2500 nm is not less than 80%, the average value of the radial recovery angle of the radiation refrigeration fabric is not less than 95%, and the average value of the latitudinal recovery angle is not less than 91%. The radiation refrigeration fabric has good sun shading and radiation refrigeration functions, and is good in crease resistance, and the surface of the radiation refrigeration fabric is not prone to generating creases when the radiation refrigeration fabric is repeatedly folded for use.
Description
Technical Field
The invention relates to the technical field of radiation refrigeration, in particular to a radiation refrigeration fabric and application thereof.
Background
The sun-shading products on the market at present are various, such as sun-shading boards, outdoor blind curtains, outdoor hard rolling curtains, outdoor soft rolling curtains, awning curtains, car covers, umbrellas and the like. However, the existing sunshade products only have the function of shading light and have no refrigeration effect. With the development of radiation refrigeration technology, researchers begin to research the application of radiation refrigeration technology to sunshade products to endow the sunshade products with a passive cooling function, and in the research and development process, a plurality of practical application problems need to be solved.
Disclosure of Invention
The invention aims to provide a radiation refrigeration fabric with sun shading and passive cooling functions, which has good wrinkle resistance.
In order to achieve the purpose, the invention provides a radiation refrigeration fabric, which comprises a flexible substrate layer and a functional layer which are arranged in a stacked mode, wherein the thickness of the functional layer is 10-200 mu m, the functional layer comprises a resin substrate and functional fillers dispersed in the resin substrate, the mass fraction of the functional fillers in the functional layer is 1-20%, the emissivity of the radiation refrigeration fabric in a 7-14 mu m waveband is not lower than 80%, the reflectivity of the radiation refrigeration fabric in a 300-2500 nm waveband is not lower than 80%, the average value of the radial recovery angles of the radiation refrigeration fabric is not less than 95%, and the average value of the latitudinal recovery angles of the radiation refrigeration fabric is not less than 91%.
Preferably, the thickness of the flexible base material layer is 300 micrometers-2 mm, the mass fraction of the functional filler in the functional layer is 8% -20%, the average value of the radial recovery angles of the radiation refrigeration fabric is more than or equal to 98 degrees, and the average value of the latitudinal recovery angles of the radiation refrigeration fabric is more than or equal to 93 degrees.
In some embodiments, the flexible substrate layer is selected from one or more of terylene, chinlon, acrylic fiber, silk, cotton or hemp blended fabric, and the thickness of the flexible substrate layer is 300-2 mm.
In other embodiments, the flexible substrate layer comprises a cloth layer and a resin coating layer coated on one side or two sides of the cloth layer, the cloth layer is selected from one or more of terylene, chinlon, acrylon, silk, cotton or hemp, the material of the resin coating layer can be selected from one or more of polyvinyl chloride, acrylic resin, epoxy resin, phenolic resin and polyurethane, the thickness of the cloth layer is 300-2 mm, and the thickness of the resin coating layer is 1-20 μm.
Preferably, the functional filler of the functional layer comprises a first filler and a second filler, the particle size of the first filler is 0.01-5 μm, the particle size of the second filler is 5-15 μm, the particle size of the second filler is larger than that of the first filler, the first filler and the second filler are respectively and independently selected from one or more of cesium tungsten bronze, tin antimony oxide, indium tin oxide, zinc aluminum oxide, silica, silicon carbide, titanium dioxide, calcium carbonate, barium sulfate and silicon nitride, and the mass ratio of the first filler to the second filler is (4: 1) - (1: 4).
In some of these embodiments, the resin substrate of the functional layer is selected from one or more of polyimide, cyclic olefin polymer, epoxy, polyester, polyurethane, acrylic, silicone.
In some of these embodiments, the functional layer further comprises an auxiliary agent dispersed in the resin substrate, the auxiliary agent comprising at least one of a dispersant, a defoamer, a wetting agent, a preservative, a film-forming auxiliary agent.
In some embodiments, an interface agent layer is further arranged between the flexible substrate layer and the functional layer, the thickness of the interface agent layer is 1-20 μm, and the material of the interface agent layer is selected from one or more of acrylic resin, polyurethane and epoxy resin.
In some embodiments, a waterproof layer is further arranged on one side of the flexible substrate layer away from the functional layer, the thickness of the waterproof layer is 1-20 μm, the waterproof layer is made of one or more materials selected from acrylic resin, polyurethane and epoxy resin, and the transmittance of the waterproof layer in a visible light range of 400-700 nm is greater than or equal to 80%.
In some embodiments, the radiation refrigeration fabric further comprises a hydrophobic layer, the hydrophobic layer is arranged on one side, away from the flexible base material layer, of the functional layer, the thickness of the hydrophobic layer is 1-20 micrometers, the material of the hydrophobic layer is selected from one or more of fluorine-containing resin and organic silicon resin, nanoscale silica particles are dispersed in the hydrophobic layer, the mass fraction of the silica particles in the hydrophobic layer is 0.5-5%, and the transmissivity of the hydrophobic layer to infrared rays with the wave band of 7-14 micrometers is greater than or equal to 80%.
The invention also provides application of the radiation refrigeration fabric, and the radiation refrigeration fabric is used for sun shades, car covers, tents, awnings, sunshades, outdoor clothes or sun hats.
Compared with the prior art, the invention has the beneficial effects that: the radiation refrigeration fabric has good sun-shading and radiation refrigeration functions, and is good in crease resistance, and when the radiation refrigeration fabric is repeatedly folded for use, the surface of the radiation refrigeration fabric is not prone to generating creases.
Drawings
FIG. 1 is a schematic view of a first embodiment of a radiation-cooled fabric of the present invention;
FIG. 2 is a schematic view of a second embodiment of a radiation-cooled face fabric of the present invention;
FIG. 3 is a schematic view of a third embodiment of a radiation-cooled fabric of the present invention;
FIG. 4 is a schematic view of a fourth embodiment of a radiation-cooled fabric of the present invention;
FIG. 5 is a graph showing the comparison of indoor temperature when a curtain made of the radiation refrigeration fabric of the present invention and a curtain made of a common sunshade fabric are used in a building respectively;
FIG. 6 is a comparison curve of the temperature in the automobile when the automobile is respectively covered by the radiation refrigeration fabric of the invention, covered by the common fabric and not covered by the automobile;
FIG. 7 is a comparison curve of the temperature inside the tent when the tent is made of the radiation refrigeration fabric of the present invention and the common sunshade fabric, respectively;
in the figure: 1. a substrate layer; 2. a functional layer; 3. an interfacial agent layer; 4. a waterproof layer; 5. a hydrophobic layer.
Detailed Description
The present invention is further described below with reference to specific embodiments, and it should be noted that, without conflict, any combination between the embodiments or technical features described below may form a new embodiment.
In the description of the present invention, it should be noted that, for the terms of orientation, such as "central", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., it indicates that the orientation and positional relationship shown in the drawings are based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, but does not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated without limiting the specific scope of protection of the present invention.
It should be noted that the terms "first," "second," and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order, it being understood that the data so used may be interchanged under appropriate circumstances to facilitate describing embodiments of the present application herein.
The terms "comprises," "comprising," and "having," and any variations thereof, in the description and claims of this application, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
As shown in figure 1, the invention provides a radiation refrigeration fabric, which comprises a flexible substrate layer 1 and a functional layer 2 which are arranged in a stacked mode, wherein the thickness of the functional layer 2 is 10-200 mu m, the functional layer 2 comprises a resin substrate and functional fillers dispersed in the resin substrate, the mass fraction of the functional fillers in the functional layer 2 is 1-20%, the emissivity of the radiation refrigeration fabric in a wave band of 7-14 mu m is not lower than 80%, and the reflectivity of the radiation refrigeration fabric in a wave band of 300-2500 nm is not lower than 80%.
In the radiation refrigeration fabric, the functional layer 2 mainly plays the functions of reflecting sunlight and passively cooling, wherein the reflection function and the passive cooling function of the functional layer 2 are endowed by the resin base material and the functional filler together. The thicker the functional layer 2 is, the higher the content of the functional filler is, the better the sun-shading and radiation refrigerating effects are. However, the inventor finds that the functional layer 2 is too thick and the content of the functional filler is too high, which causes the wrinkle resistance of the radiation refrigeration fabric to be poor, and particularly, after the radiation refrigeration fabric is folded for many times, the surface wrinkles are more, which affects the beauty on one hand, and also has a certain influence on the function of the radiation refrigeration fabric on the other hand. However, if the functional layer 2 is too thin or the functional filler is too small, the reflection and radiation cooling functions of the functional layer 2 are deteriorated. In order to balance the two performances of the radiation refrigeration fabric, the inventor conducts intensive research, and finds that when the thickness of the functional layer 2 is 10-200 μm, and the mass fraction of the functional filler in the functional layer 2 is 1-20%, the radiation refrigeration fabric with good wrinkle resistance can be obtained, and meanwhile, the emissivity of the functional layer 2 in a wave band of 7-14 μm can be ensured to be not lower than 80%, and the reflectivity in a wave band of 300-2500 nm is not lower than 80%.
The wrinkle resistance of the radiation refrigeration fabric can be represented by a wrinkle recovery angle, preferably, the average value of the radial recovery angle of the radiation refrigeration fabric is more than or equal to 95 degrees, and the average value of the weft recovery angle of the radiation refrigeration fabric is more than or equal to 91 degrees.
Further preferably, the thickness of the flexible substrate layer 1 is 300 micrometers-2 mm, the mass fraction of the functional filler in the functional layer 2 is 8% -20%, the average value of the radial recovery angles of the radiation refrigeration fabric is not less than 98 degrees, and the average value of the latitudinal recovery angles of the radiation refrigeration fabric is not less than 93 degrees.
In some embodiments, the flexible substrate layer 1 is a cloth, the cloth may be a blend of one or more selected from polyester, nylon, acrylic, silk, cotton, and hemp, and the thickness of the flexible substrate layer 1 may be 300 μm to 2 mm.
In other embodiments, the flexible substrate layer 1 includes a cloth layer and a resin coating layer coated on one or both sides of the cloth layer. The cloth layer can be selected from one or more of terylene, chinlon, acrylon, silk and cotton-flax blended fabrics, and the material of the resin coating layer can be selected from one or more of polyvinyl chloride, acrylic resin, epoxy resin, phenolic resin and polyurethane. The thickness of the cloth layer can be 300 mu m-2 mm, and the thickness of the resin coating layer can be 1 mu m-20 mu m.
Preferably, the functional filler of the functional layer 2 comprises a first filler and a second filler, the particle size of the first filler is 0.01-5 μm, the particle size of the second filler is 5-15 μm, and the particle size of the second filler is larger than that of the first filler. The mass ratio of the first filler to the second filler is (4: 1) - (1: 4). The total mass of the first filler and the second filler accounts for 1-20% of the mass of the functional layer 2. The first filler and the second filler are each independently selected from one or more of cesium tungsten bronze, tin antimony oxide, indium tin oxide, zinc aluminum oxide, silica, silicon carbide, titanium dioxide, calcium carbonate, barium sulfate, silicon nitride. The first filler and the second filler can emit infrared rays in an atmospheric window waveband (7-14 microns) and have a radiation refrigeration function, in addition, the first filler can better reflect sunlight (300-2500 nm waveband), and the second filler can further increase the reflection of the functional layer 2 to the sunlight.
According to the radiation refrigeration fabric, the functional filler is composed of the first filler with the small particle size and the second filler with the large particle size, and the fillers with different particle sizes are combined, so that the reflection of the functional filler to sunlight can be better improved, and the reflection and heat insulation effects of the radiation refrigeration fabric are further improved.
Further, the resin substrate of the functional layer 2 may be selected from one or more of polyimide, cycloolefin polymer, epoxy resin, polyester, polyurethane, acrylic resin, silicone resin.
It should be noted that the functional layer 2 may be a single layer or a plurality of layers, which is not limited in the present invention.
Preferably, the functional layer 2 further comprises an auxiliary agent dispersed in the resin base material, which may be, but is not limited to, a dispersing agent, a defoaming agent, a wetting agent, a preservative, a film-forming auxiliary agent.
In some embodiments, as shown in fig. 2, an interfacial agent layer 3 is further disposed between the flexible substrate layer 1 and the functional layer 2, the thickness of the interfacial agent layer 3 is 1 μm to 20 μm, and the material of the interfacial agent layer 3 may be selected from one or more of acrylic resin, polyurethane, and epoxy resin. The interfacial agent layer 3 is used for improving the adhesive force of the functional layer 2 on the flexible substrate layer 1, and has a waterproof function. In some embodiments, as shown in fig. 3, the flexible substrate layer 1 is further provided with a waterproof layer 4 on a side away from the functional layer 2, the thickness of the waterproof layer 4 is 1 μm to 20 μm, and the material of the waterproof layer 4 may be selected from one or more of acrylic resin, polyurethane and epoxy resin. The transmissivity of the waterproof layer 4 in a visible light range of 400 nm-700 nm is more than or equal to 80%, and the waterproof layer 4 has good light transmission and basically cannot shield the patterns on the inner side surface of the flexible substrate layer 1.
In some embodiments, as shown in fig. 5, the radiation refrigeration fabric further includes a hydrophobic layer 5, and the hydrophobic layer 5 is disposed on a side of the functional layer 2 away from the flexible substrate layer 1. The material of the hydrophobic layer 5 may be selected from one or more of fluorine-containing resin and silicone resin. Furthermore, nano-scale silicon dioxide particles are dispersed in the hydrophobic layer 5, the mass fraction of the silicon dioxide particles in the hydrophobic layer 5 is 0.5% -5%, the particle size of the silicon dioxide particles is 0.5-20 nm, the silicon dioxide particles can further improve the hydrophobic performance of the hydrophobic layer 5, and the contact angle of the hydrophobic layer 5 is larger than 110 degrees. The thickness of the hydrophobic layer 5 is 1 μm to 20 μm. The transmissivity of the hydrophobic layer 5 to the infrared ray with the wave band of 7-14 microns is more than or equal to 80%, so that the radiation refrigeration effect of the functional layer 2 is not affected by the hydrophobic layer 5 basically.
The radiation refrigeration fabric can be used as the fabric of products such as sun-shading curtains, car covers, tents, sunshades, outdoor clothes, sun-shading hats and the like. Of course, the application scope of the radiation refrigeration fabric of the present invention is not limited to the above listed products.
[ example 1 ]
The radiation refrigeration fabric comprises a waterproof layer, a flexible substrate layer, an interfacial agent layer, a functional layer and a hydrophobic layer which are sequentially arranged. The waterproof layer is acrylic resin with the thickness of 10 mu m; the flexible substrate layer is made of terylene cloth with the thickness of 1 mm; the interface agent layer is polyurethane with the thickness of 10 mu m; the thickness of the functional layer is 30 μm, and the functional layer comprises 85wt% of epoxy resin, 10wt% of titanium dioxide (particle size is 5 μm), 3wt% of silicon nitride (particle size is 1 μm) and 2wt% of auxiliary agent; the hydrophobic layer is fluorine-containing resin with the thickness of 10 mu m.
[ example 2 ]
The radiation refrigeration fabric comprises a waterproof layer, a flexible substrate layer, a functional layer and a hydrophobic layer which are sequentially arranged. The waterproof layer is polyurethane with the thickness of 20 mu m; the flexible substrate layer is a terylene woven fabric with the thickness of 1 mm; the thickness of the functional layer is 60 μm, and the functional layer comprises 88wt% of polyimide, 5wt% of calcium carbonate (particle size of 3 μm), 3wt% of silica (particle size of 5 μm) and 4wt% of an auxiliary agent; the hydrophobic layer is fluorine-containing resin with the thickness of 10 mu m.
[ example 3 ]
The radiation refrigeration fabric comprises a flexible substrate layer, an interfacial agent layer, a functional layer and a hydrophobic layer which are sequentially arranged. The flexible substrate layer is made of terylene cloth with the thickness of 1 mm; the interface agent layer is epoxy resin with the thickness of 20 mu m; the thickness of the functional layer is 10 μm, and the functional layer comprises 80wt% of cycloolefin polymer, 9wt% of barium sulfate (particle size of 2 μm), 9wt% of silicon carbide (particle size of 7 μm) and 2wt% of auxiliary agent; the hydrophobic layer is a silicone resin with a thickness of 20 μm.
[ example 4 ]
The radiation refrigeration fabric comprises a flexible substrate layer and a functional layer which are sequentially arranged. The flexible substrate layer is made of terylene cloth with the thickness of 1 mm; the functional layer had a thickness of 200 μm and comprised 76wt% of polyester, 10wt% of zinc aluminum oxide (particle size 1 μm), 10wt% of silica (particle size 8 μm) and 4wt% of an auxiliary.
[ example 5 ]
The radiation refrigeration fabric comprises a flexible substrate layer and a functional layer which are sequentially arranged. The flexible substrate layer is cotton cloth with the thickness of 2 mm; the thickness of the functional layer is 150 μm, and the functional layer comprises 80wt% of polyurethane, 6wt% of indium tin oxide (particle size of 0.01 μm), 12wt% of titanium dioxide (particle size of 6 μm) and 2wt% of an auxiliary agent.
[ example 6 ]
The radiation refrigeration fabric comprises a flexible substrate layer and a functional layer which are sequentially arranged. The flexible substrate layer is nylon cloth with the thickness of 0.3 mm; the thickness of the functional layer was 100 μm, and the functional layer included 90wt% of acrylic resin, 4wt% of indium tin oxide (particle size 3 μm), 4wt% of calcium carbonate (particle size 15 μm), and 2wt% of an auxiliary.
[ example 7 ]
The radiation refrigeration fabric comprises a flexible substrate layer and a functional layer which are sequentially arranged. The flexible substrate layer comprises 0.5mm thick terylene cloth and 20 μm thick polyvinyl chloride coated on two sides of the terylene cloth; the thickness of the functional layer is 80 μm, and the functional layer comprises 88wt% of silicone resin, 8wt% of cesium tungsten bronze (particle size of 2 μm), 3wt% of silicon nitride (particle size of 10 μm), and 1wt% of an auxiliary agent.
[ example 8 ]
The radiation refrigeration fabric comprises a flexible substrate layer and a functional layer which are sequentially arranged. The flexible substrate layer comprises 0.5mm thick terylene cloth and 20 μm thick polyurethane coated on two sides of the terylene cloth; the thickness of the functional layer was 120 μm, and the functional layer included 85wt% of an acrylic resin, 6wt% of barium sulfate (particle size 3 μm), 6wt% of calcium carbonate (particle size 15 μm), and 3wt% of an auxiliary agent.
[ example 9 ]
The radiation refrigeration fabric comprises a flexible substrate layer and a functional layer which are sequentially arranged. The flexible substrate layer is made of terylene cloth with the thickness of 1 mm; the thickness of the functional layer was 100 μm, and the functional layer included 90wt% of silicone resin, 5wt% of titanium dioxide (particle size 2 μm), 3wt% of calcium carbonate (particle size 10 μm), and 2wt% of an auxiliary agent.
Comparative example 1
The radiation refrigeration fabric comprises a flexible substrate layer and a functional layer which are sequentially arranged. The flexible substrate layer is made of terylene cloth with the thickness of 1 mm; the thickness of the functional layer was 250 μm, and the functional layer included 90wt% of silicone resin, 5wt% of titanium dioxide (particle size 2 μm), 3wt% of calcium carbonate (particle size 10 μm), and 2wt% of an auxiliary agent.
Comparative example 2
The radiation refrigeration fabric comprises a flexible substrate layer and a functional layer which are sequentially arranged. The flexible substrate layer is made of terylene cloth with the thickness of 1 mm; the thickness of the functional layer was 5 μm, and the functional layer included 70wt% of silicone resin, 14wt% of titanium dioxide (particle size 2 μm), 14wt% of calcium carbonate (particle size 10 μm), and 2wt% of an auxiliary agent.
Comparative example 3
The radiation refrigeration fabric comprises a waterproof layer, a flexible substrate layer, an interfacial agent layer, a functional layer and a hydrophobic layer which are sequentially arranged. The waterproof layer is acrylic resin with the thickness of 25 mu m; the flexible substrate layer is made of terylene cloth with the thickness of 1 mm; the interface agent layer is polyurethane with the thickness of 25 mu m; the thickness of the functional layer is 200 μm, and the functional layer comprises 85wt% of epoxy resin, 10wt% of titanium dioxide (particle size is 5 μm), 3wt% of silicon nitride (particle size is 1 μm) and 2wt% of other auxiliary agents; the hydrophobic layer is a fluorine-containing resin with a thickness of 25 μm.
The reflectivity of the radiation refrigeration fabric in each embodiment and the comparative example in the wave band of 300 nm-2500 nm and the emissivity of the radiation refrigeration fabric in the wave band of 7 mu m-14 mu m are measured. The test results are shown in Table 1.
The wrinkle resistance of the radiation refrigeration fabrics of the above examples and comparative examples was measured. The fabric was tested for wrinkle recovery according to GB/T3819-1997. Before the sample is cut, the sample is placed for 24h under standard conditions (the temperature is 20 +/-3 ℃, and the relative humidity is 65 +/-5%), a domestic YG (B)541D type fabric wrinkle elastometer is used, the warp and weft directions of the fabric are marked, and a 40mm multiplied by 15mm sample in a convex shape is cut at a position 5cm away from the fabric edge along the width direction of the sample. The sample was folded in half as specified, left to stand under a pressure of 10N for 1 minute, the machine automatically measured the angle of gentle springing of the sample (after releasing the weight for 5 minutes), and measured 5 times in each of the warp and weft directions to find an average value, the larger the crease recovery angle, the better the crease resistance of the fabric. The test results are shown in Table 1.
TABLE 1
| Examples | Reflectivity of 300 nm-2500 nm wave band | Emissivity of 7-14 mu m wave band | Mean value of radial recovery angle | Average value of weft recovery angle |
| Example 1 | 86% | 87% | 104.4° | 100.4° |
| Example 2 | 88% | 89% | 103.9° | 100.2° |
| Example 3 | 82% | 83% | 104.7° | 101.2° |
| Example 4 | 93% | 94% | 98.4° | 93.7° |
| Example 5 | 92% | 94% | 100.7° | 98.0° |
| Example 6 | 92% | 93% | 102.8° | 99.3° |
| Example 7 | 90% | 91% | 103.2° | 99.8° |
| Example 8 | 92% | 93% | 101.5° | 98.5° |
| Example 9 | 92% | 93% | 102.6° | 99.2° |
| Comparative example 1 | 92% | 93% | 89.2° | 84.3° |
| Comparative example 2 | 69% | 72% | 93.5° | 90.4° |
| Comparative example 3 | 93% | 93% | 90.7° | 84.8° |
From the recovery angle data of example 9 and comparative example 1, it can be seen that the wrinkle resistance of the face fabric is significantly reduced when the thickness of the functional layer exceeds 200 μm, while the reflectivity and emissivity of the functional layer gradually stabilize with increasing thickness. That is, when the thickness of the functional layer reaches about 200 μm, the reflection and radiation refrigerating capabilities of the functional layer are not improved by continuously increasing the thickness of the functional layer, and the crease resistance of the fabric is deteriorated.
As can be seen from the recovery angle data of example 9 and comparative example 2, when the filler in the functional layer exceeds 20%, the wrinkle resistance of the face fabric is deteriorated even if the thickness of the functional layer is thin.
As can be seen from the recovery angle data of example 1 and comparative example 3, when the thickness of each layer in the radiation-cooled fabric exceeds a certain value, the wrinkle resistance of the fabric is deteriorated.
The following provides a first application case of the radiation refrigeration fabric:
(1) providing a stainless steel exhibition room A with a length, width and height of 5m, 4m and 3m, wherein a glass window is arranged on one side wall of the exhibition room, the size of the glass window is 2.5m x 2m, the radiation refrigeration fabric prepared in the embodiment 6 is arranged on the inner side of the glass window of the exhibition room, and the area of the radiation refrigeration fabric is 5m2The display house A is placed in an open place outdoors, and the temperature change of the temperature measuring point at the middle position in the display house A is measured and recorded by a thermocouple with a data recorder, as shown in a curve A1 in FIG. 5.
(2) Providing a stainless steel exhibition room B, which has the same material, size, structure and shape as the exhibition room A, and is characterized in that a glass window of the exhibition room B is provided with a common window shade (1 mm thick terylene cloth) with an area of 5m2The display house B is placed in a place consistent with the environment of the display house, and a thermocouple with a data recorder is used for measuring and recording the temperature change of the temperature measuring point at the middle position in the display house B, as shown in a curve B1 in fig. 5.
And (3) simultaneously with the measurement in the steps (1) and (2), testing the ambient temperature and the solar radiation amount of the outdoor environment at that time, and referring to an ambient temperature curve and a solar radiation amount curve in fig. 5. Comparing each curve of fig. 5, it can be seen that, in the same time quantum, the temperature in the exhibition room B can be 20 ℃ higher than the outdoor temperature, and the temperature in the exhibition room a can be 6 ℃ lower than the temperature in the exhibition room B at most, which shows that the radiation refrigeration fabric has a better passive cooling effect, can reduce the indoor temperature, improve the indoor comfort level, and is energy-saving and environment-friendly.
A second example of a radiation-cooled fabric is provided below:
three automobiles C, D, E with the same brand and model are provided, the three automobiles are parked in a place with the same environment, the outer cover of the automobile C is covered with an automobile cover made of common fabric (polyester cloth with the thickness of 1 mm), the outer cover of the automobile D is covered with an automobile cover made of radiation refrigeration fabric made in the embodiment 8, the outer cover of the automobile E is not arranged, temperature measuring points are respectively arranged at the middle positions of the driving cabin of the automobile C, D, E, thermocouples with a data recorder are used for measuring and recording the temperature change of the temperature measuring points of the automobiles, and the measuring results are respectively shown as curves C1, D1 and E1 in FIG. 6. While the temperature inside the vehicle is measured, the ambient temperature and the solar irradiance at that time outside the room are also measured, which is shown as the ambient temperature curve and the solar irradiance curve in fig. 2. Comparing the curves in fig. 6, it can be seen that the temperature in the automobile with the radiation refrigeration fabric cover is the lowest, the maximum temperature difference between D1 and C1 can reach 20 ℃ and the maximum temperature difference between D1 and E1 can reach 30 ℃ in the same time period. The radiation refrigeration fabric is used for preparing the car cover, so that the temperature in the car can be greatly reduced, the problem of warming up when the car is parked under the sun exposure is solved, the service life of the car is prolonged, the use safety is improved, and the comfort level in the car is increased.
A third example of a radiation-cooled fabric is provided below:
the tent H and the tent J having the same size, shape and style were provided, in which the fabric of the tent H was the radiation refrigeration fabric prepared in example 9, the fabric of the tent J was a common fabric (polyester cloth having a thickness of 1 mm), the tents H and J were placed in a place where the environments were consistent, the temperature change at the center position of the screens in the tents H and J was measured, and the measurement results were respectively shown as curves H1 and J1 in fig. 7, and while measuring the temperature in the tent, the ambient temperature and the solar irradiance at that time in the open air were also measured, as shown as the ambient temperature curve and the solar irradiance curve in fig. 7. Comparing each curve of fig. 7, it can be found that, in the same time period, the maximum temperature difference between H1 and J1 can reach 20 ℃, and the tent made of the radiation refrigeration fabric has an obvious passive cooling effect, and can reduce the internal temperature of the tent and improve the comfort level in the tent.
The foregoing has described the general principles, principal features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are merely illustrative of the principles of the invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. The radiation refrigeration fabric is characterized by comprising a flexible substrate layer and a functional layer which are arranged in a stacked mode, wherein the thickness of the functional layer is 10-200 mu m, the functional layer comprises a resin substrate and functional fillers dispersed in the resin substrate, the mass fraction of the functional fillers in the functional layer is 1-20%, the emissivity of the radiation refrigeration fabric in a wave band of 7-14 mu m is not lower than 80%, the reflectivity of the radiation refrigeration fabric in a wave band of 300-2500 nm is not lower than 80%, the average value of the radial recovery angles of the radiation refrigeration fabric is not less than 95%, and the average value of the latitudinal recovery angles of the radiation refrigeration fabric is not less than 91%.
2. The radiation refrigeration fabric according to claim 1, wherein the thickness of the flexible substrate layer is 300 μm-2 mm, the mass fraction of the functional filler in the functional layer is 8% -20%, the average value of the radial recovery angles of the radiation refrigeration fabric is not less than 98 degrees, and the average value of the latitudinal recovery angles of the radiation refrigeration fabric is not less than 93 degrees.
3. The radiation refrigeration fabric according to claim 1, wherein the flexible substrate layer is selected from one or more of terylene, chinlon, acrylic fiber, silk, cotton or hemp blended fabric, and the thickness of the flexible substrate layer is 300 μm-2 mm.
4. The radiation refrigeration fabric according to claim 1, wherein the flexible substrate layer comprises a cloth layer and a resin coating layer coated on one side or two sides of the cloth layer, the cloth layer is selected from one or more of terylene, chinlon, acrylon, silk, cotton or hemp, the resin coating layer is made of one or more of polyvinyl chloride, acrylic resin, epoxy resin, phenolic resin and polyurethane, the cloth layer has a thickness of 300-2 mm, and the resin coating layer has a thickness of 1-20 μm.
5. The radiation refrigeration fabric according to any one of claims 1 to 4, wherein the functional filler of the functional layer comprises a first filler and a second filler, the particle size of the first filler is 0.01-5 μm, the particle size of the second filler is 5-15 μm, the particle size of the second filler is larger than that of the first filler, the first filler and the second filler are respectively and independently selected from one or more of cesium tungsten bronze, tin antimony oxide, indium tin oxide, zinc aluminum oxide, silica, silicon carbide, titanium dioxide, calcium carbonate, barium sulfate and silicon nitride, and the mass ratio of the first filler to the second filler is (4: 1) - (1: 4).
6. The radiation refrigeration fabric according to any one of claims 1 to 4, wherein the resin substrate of the functional layer is selected from one or more of polyimide, cyclic olefin polymer, epoxy resin, polyester, polyurethane, acrylic resin, and silicone resin.
7. The radiation refrigeration fabric according to any one of claims 1 to 4, wherein an interfacial agent layer is further arranged between the flexible substrate layer and the functional layer, the thickness of the interfacial agent layer is 1 μm-20 μm, and the material of the interfacial agent layer is selected from one or more of acrylic resin, polyurethane and epoxy resin.
8. The radiation refrigeration fabric according to any one of claims 1 to 4, wherein a waterproof layer is further arranged on one side of the flexible substrate layer away from the functional layer, the thickness of the waterproof layer is 1-20 μm, the waterproof layer is made of one or more materials selected from acrylic resin, polyurethane and epoxy resin, and the transmissivity of the waterproof layer in a visible light range of 400-700 nm is greater than or equal to 80%.
9. The radiation refrigeration fabric according to any one of claims 1 to 4, wherein the radiation refrigeration fabric further comprises a hydrophobic layer, the hydrophobic layer is arranged on one side of the functional layer far away from the flexible substrate layer, the thickness of the hydrophobic layer is 1 μm to 20 μm, the material of the hydrophobic layer is selected from one or more of fluorine-containing resin and organic silicon resin, nanoscale silica particles are dispersed in the hydrophobic layer, the mass fraction of the silica particles in the hydrophobic layer is 0.5% to 5%, and the transmissivity of the hydrophobic layer to infrared rays with the wavelength range of 7 μm to 14 μm is greater than or equal to 80%.
10. Use of a radiation-cooled material according to any of claims 1 to 9 for sunshades, car covers, tents, awnings, sunshades, outdoor clothing, sun-shades.
Priority Applications (11)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911086548.1A CN110815985A (en) | 2019-11-08 | 2019-11-08 | Radiation refrigeration fabric and application thereof |
| JP2020072967A JP6944013B2 (en) | 2019-11-06 | 2020-04-15 | Radiative cooling fabrics and products |
| US16/968,600 US12053962B2 (en) | 2019-11-06 | 2020-07-10 | Radiative cooling fabrics and products |
| SG11202007745WA SG11202007745WA (en) | 2019-11-06 | 2020-07-10 | Radiative cooling fabrics and products |
| AU2020217350A AU2020217350B2 (en) | 2019-11-06 | 2020-07-10 | Radiative cooling fabrics and products |
| MX2020009186A MX2020009186A (en) | 2019-11-06 | 2020-07-10 | Radiation refrigeration fabric and product. |
| PCT/CN2020/101230 WO2021088398A1 (en) | 2019-11-06 | 2020-07-10 | Radiation refrigeration fabric and product |
| TW109126376A TWI730863B (en) | 2019-11-06 | 2020-08-04 | Radiative cooling fabrics and products |
| EP20020365.1A EP3819425A1 (en) | 2019-11-06 | 2020-08-11 | Radiative cooling fabrics and products |
| PH12020551236A PH12020551236A1 (en) | 2019-11-06 | 2020-08-12 | Radiative cooling fabrics and products |
| BR102020017718-4A BR102020017718A2 (en) | 2019-11-06 | 2020-08-31 | radiant cooling fabrics and products |
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| CN201911086548.1A CN110815985A (en) | 2019-11-08 | 2019-11-08 | Radiation refrigeration fabric and application thereof |
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| CN110815985A true CN110815985A (en) | 2020-02-21 |
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| JP2021075031A (en) * | 2019-11-06 | 2021-05-20 | 寧波瑞凌新能源科技有限公司Ｎｉｎｇｂｏ Ｒａｄｉ−Ｃｏｏｌ Ａｄｖａｎｃｅｄ Ｅｎｅｒｇｙ Ｔｅｃｈｎｏｌｏｇｉｅｓ Ｃｏ．， Ｌｔｄ． | Radiation cooling dough and product |
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