CN113698811B - Cooling coating and cooling coating - Google Patents

Cooling coating and cooling coating Download PDF

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Publication number
CN113698811B
CN113698811B CN202111169026.5A CN202111169026A CN113698811B CN 113698811 B CN113698811 B CN 113698811B CN 202111169026 A CN202111169026 A CN 202111169026A CN 113698811 B CN113698811 B CN 113698811B
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resin
filler
equal
cooling coating
putty
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CN113698811A (en
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徐绍禹
万容兵
陈孝行
杨荣宝
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Fujian Ruiling New Energy Technology Co.,Ltd.
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Ningbo Ruiling New Energy Materials Research Institute Co ltd
Ningbo Ruiling New Energy Technology Co ltd
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    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09DCOATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D5/00Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/34Filling pastes
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09DCOATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D133/00Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09DCOATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D163/00Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09DCOATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D175/00Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
    • C09D175/04Polyurethanes
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09DCOATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D183/00Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Coating compositions based on derivatives of such polymers
    • C09D183/04Polysiloxanes
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09DCOATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D5/00Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/004Reflecting paints; Signal paints

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
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  • Wood Science & Technology (AREA)
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Abstract

The invention relates to a cooling coating and a cooling coating, wherein the cooling coating comprises liquid putty, the liquid putty comprises first resin and first filler, the sunlight reflectivity of the first filler in a 0.3-2.5 mu m waveband is greater than or equal to 85%, and the sunlight reflectivity of a putty layer formed by using the liquid putty in the 0.3-2.5 mu m waveband is greater than or equal to 88%. The reflectivity of the cooling coating prepared by the cooling coating to sunlight with a wave band of 0.3-2.5 mu m reaches over 88 percent, the indoor temperature of a building can be effectively reduced, meanwhile, the construction procedure is simple, the raw material cost and the construction cost of the radiation refrigeration finish paint layer are low, and further the raw material cost, the construction cost and the weather resistance of the cooling coating are low.

Description

Cooling coating and cooling coating
Technical Field
The invention relates to the technical field of coatings, in particular to a cooling coating and a cooling coating.
Background
In order to reduce the indoor temperature of a building, a cooling coating is generally required to be arranged on the roof or the wall of the building. The traditional cooling coating comprises a bottom putty layer, a supporting layer, a face putty layer and a radiation refrigeration finish paint layer, wherein 3-6 radiation refrigeration finish paint layers are required to be applied in order to enable the reflectivity of the cooling coating to the sunlight with the wave band of 0.3-2.5 mu m to reach more than 88%, the thickness of each radiation refrigeration finish paint layer is about 30-50 mu m, and the total thickness of the radiation refrigeration finish paint layers reaches 0.2-0.5 mm. However, the construction procedure is complicated due to the multiple construction of the radiation refrigeration finish paint layer, and the raw material cost and the construction cost of the radiation refrigeration finish paint layer are high, so that the reflectivity of the cooling coating to the sunlight with the wave band of 0.3-2.5 μm is usually less than 88% in practical application.
Disclosure of Invention
Based on the above, there is a need for a cooling coating and a cooling coating, wherein the reflectivity of the cooling coating made of the cooling coating to sunlight with a wave band of 0.3 μm to 2.5 μm reaches above 88%, the indoor temperature of a building can be effectively reduced, and meanwhile, the construction procedure is simple, the raw material cost and the construction cost of the radiation refrigeration finish paint layer are low, and further the raw material cost and the construction cost of the cooling coating are low.
The invention provides a cooling coating, which comprises liquid putty, wherein the liquid putty comprises first resin and first filler, the sunlight reflectivity of the first filler in a 0.3-2.5 mu m waveband is greater than or equal to 85%, and the sunlight reflectivity of a putty layer formed by using the liquid putty in a 0.3-2.5 mu m waveband is greater than or equal to 88%.
In one embodiment, the cooling coating comprises a radiation refrigeration coating matched with the liquid putty, the sunlight reflectivity of a radiation refrigeration finish paint layer formed by the radiation refrigeration coating in a wave band of 0.3-2.5 μm is greater than or equal to 82%, and the atmospheric window emissivity in a wave band of 8-13 μm is greater than or equal to 88%.
In an embodiment, the first filler comprises at least one of calcium carbonate, barium sulfate, alumina, ceramic powder, aluminum silicate, talc, titanium dioxide, magnesium oxide, ceramic beads, or glass beads.
In one embodiment, the first filler has a reflectance of ultraviolet light, visible light, and infrared light of the sunlight of greater than or equal to 85%.
In one embodiment, the first filler has a mass of 200 parts by weight to 700 parts by weight based on 100 parts by weight of the first resin.
In one embodiment, the first resin has an elastic modulus of less than or equal to 2 MPa.
In one embodiment, the first resin has a solar transmittance of 90% or more in a wavelength band of 0.3 μm to 2.5 μm.
In one embodiment, the first resin includes at least one of an epoxy resin, a polyester resin, a polyacrylate resin, a polyamide resin, a polyurethane resin, a polyolefin resin, or a fluororesin.
In one embodiment, the liquid putty further comprises an auxiliary agent, wherein the mass of the auxiliary agent is less than or equal to 25 parts by weight based on 100 parts by weight of the first resin, and the auxiliary agent comprises at least one of a film forming auxiliary agent, a dispersing agent, a thickening agent or a defoaming agent.
In one embodiment, the radiation refrigeration coating comprises a second resin and a second filler and/or a third filler distributed in the second resin, the second resin comprises at least one of epoxy resin, polyester resin, polyurethane resin, acrylic resin or organic silicon resin, the second filler comprises at least one of aluminum silicate, pearl powder, silicon dioxide, heavy calcium powder, barium sulfate, talcum powder, titanium dioxide, zinc sulfide, ceramic powder, ceramic beads or glass beads, and the third filler comprises at least one of aluminum oxide, zinc oxide, zirconium oxide, cerium oxide, lanthanum oxide, rhodium oxide or magnesium oxide.
The utility model provides a cooling coating that obtains by foretell cooling coating preparation, is including setting up in the putty layer on existing substrate surface, wherein, the substrate of putty layer is first resin, it has first filler to distribute in the putty layer, the thickness of putty layer is less than or equal to 1 mm.
In one embodiment, the cooling coating comprises a radiation refrigeration finish paint layer with the thickness of 15-60 μm, the radiation refrigeration finish paint layer is arranged on the surface, away from the existing substrate, of the putty layer in a laminated mode, the reflectivity of the cooling coating to sunlight with the wave band of 0.3-2.5 μm reaches over 88%, and the emissivity of an atmospheric window with the wave band of 8-13 μm is larger than or equal to 88%.
In the cooling coating, the first resin is used as a binder for the liquid putty, and the first resin has light transmittance, so that the first filler can fully reflect ultraviolet light, visible light and infrared light in sunlight, the sunlight reflectivity of a putty layer in a 0.3-2.5 mu m waveband is larger than or equal to 88%, when the putty layer and a radiation refrigeration finish coat layer with the sunlight reflectivity of 0.3-2.5 mu m waveband larger than or equal to 82% are stacked, the reflectivity of the cooling coating to the sunlight in the 0.3-2.5 mu m waveband reaches above 88%, and the emissivity of an atmospheric window in the 8-13 mu m waveband is larger than or equal to 88%, so that the indoor temperature of a building can be effectively reduced.
Meanwhile, when the thickness of the radiation refrigeration finish paint layer is below 15-60 mu m, the reflectivity of the radiation refrigeration finish paint layer to sunlight with a wave band of 0.3-2.5 mu m reaches above 88%, and the atmospheric window emissivity in a wave band of 8-13 mu m is larger than or equal to 88%, so that the radiation refrigeration finish paint layer only needs one construction, the putty layer and the radiation refrigeration finish paint layer are matched for use, only 2 procedures of the putty layer and the radiation refrigeration finish paint layer are needed, the construction procedure is simple and convenient, the high reflectivity of the putty layer can be utilized to effectively reduce the raw material cost and the construction cost of the radiation refrigeration finish paint layer, the raw material cost and the construction cost of the cooling coating are further reduced, and the simple procedure and the low cost can obtain the high reflectivity.
Drawings
Fig. 1 is a schematic structural diagram of a cooling coating according to an embodiment of the present invention.
In the figure: 10. a putty layer; 101. a first filler; 20. a radiation refrigeration finish paint layer; 201. a second filler; 202. a third filler; 30. and a protective layer.
Detailed Description
In order that the invention may be more fully understood, reference will now be made to the accompanying examples. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The cooling coating provided by the invention is mainly used for preparing a cooling coating, and the applicant finds that when the cooling coating is prepared by adopting the cooling coating, when the thickness of a radiation refrigeration finish paint layer is less than or equal to 60 micrometers, the reflectivity of the cooling coating to sunlight in a wave band of 0.3-2.5 micrometers is improved along with the improvement of the reflectivity of a putty layer to the sunlight in the wave band, but when the thickness of the radiation refrigeration finish paint layer is more than 60 micrometers, the light transmission effect of the radiation refrigeration finish paint layer is reduced, the effect of the putty layer on the reflection of the sunlight in the wave band of 0.3-2.5 micrometers cannot be achieved, and even if the reflectivity of the putty layer to the sunlight in the wave band of 0.3-2.5 micrometers is improved, the reflectivity of the cooling coating to the sunlight in the wave band of 0.3-2.5 micrometers cannot be improved along with the improvement of the reflectivity.
In order to enable the reflectivity of the cooling coating prepared by the cooling coating to the sunlight with the wave band of 0.3-2.5 microns to reach more than 88 percent, the indoor temperature of a building can be effectively reduced, meanwhile, the construction procedure is simple, the raw material cost and the construction cost of the radiation refrigeration finish paint layer are reduced, and further the raw material cost and the construction cost of the cooling coating are reduced.
The cooling coating provided by the invention comprises liquid putty, wherein the liquid putty comprises first resin and first filler, the sunlight reflectivity of the first filler in a wave band of 0.3-2.5 mu m is more than or equal to 85%, and the sunlight reflectivity of a putty layer formed by using the liquid putty in a wave band of 0.3-2.5 mu m is more than or equal to 88%.
In one embodiment, the first filler comprises at least one of calcium carbonate, barium sulfate, alumina, ceramic powder, aluminum silicate, titanium dioxide, magnesium oxide, ceramic beads, or glass beads; in order to enable the sunlight reflectivity of the first filler in a wave band of 0.3-2.5 microns to be higher, the sunlight reflectivity of the putty layer in a wave band of 0.3-2.5 microns is further improved to be more than 90%, and meanwhile, the indoor temperature of a building is better reduced, preferably, the reflectivity of the first filler to ultraviolet light, visible light and infrared light in sunlight is greater than or equal to 85%; the first filler further preferably includes at least one of calcium carbonate, barium sulfate, alumina, or glass beads.
The putty layer formed by the liquid putty has excellent emissivity of an atmospheric window in a wave band of 8-13 mu m, and in one embodiment, the emissivity of the atmospheric window in the wave band of 8-13 mu m of the putty layer formed by the liquid putty is greater than or equal to 86%.
In order to provide the first filler with higher solar reflectance and atmospheric window emissivity, in an embodiment, the particle size of the first filler is 1 μm to 40 μm, and more preferably 5 μm to 20 μm, the shape of the first filler is not further limited, and the first filler may be any one of rod-like, spherical, ellipsoidal, or irregular.
In order to make the putty layer formed by the liquid putty have higher reflectivity to sunlight with a wave band of 0.3-2.5 μm and avoid cracking of the putty layer in construction, in one embodiment, the mass of the first filler is 200-700 parts by weight, and more preferably 350-550 parts by weight based on 100 parts by weight of the first resin.
It will be appreciated that in order to better avoid cracking of the putty layer, in one embodiment, the first resin has a modulus of elasticity less than or equal to 2 MPa.
It can be understood that the light transmittance of the first resin affects the cooling effect of the cooling coating layer, and the light transmittance of the first resin is improved, on one hand, the absorption of the first resin on visible light can be reduced, so that the cooling coating layer has a better cooling effect, on the other hand, the reflectance of the first filler in the putty layer on ultraviolet light, visible light and infrared light in sunlight can be fully exerted, in order to further improve the sunlight reflectance of the putty layer in a 0.3 μm-2.5 μm waveband to more than 90%, the first resin with high sunlight transmittance is preferred, and in an embodiment, the sunlight transmittance of the first resin in a 0.3 μm-2.5 μm waveband is greater than or equal to 90%.
In one embodiment, the first resin includes at least one of an epoxy resin, a polyester resin, a polyacrylate resin, a polyamide resin, a polyurethane resin, a polyolefin resin, or a fluororesin. It will be appreciated that the first resin may be a water-borne resin, a solventless resin or a solvent-borne resin, preferably the first resin is a water-borne resin.
In one embodiment, the liquid putty further comprises an auxiliary agent, wherein the mass of the auxiliary agent is less than or equal to 25 parts by weight based on 100 parts by weight of the first resin.
In one embodiment, the adjuvant comprises at least one of a film forming adjuvant, a dispersant, a thickener, or a defoamer.
When the adjuvant comprises a film-forming adjuvant, which helps to enhance the film-forming properties of the liquid putty, lower the freezing temperature of the liquid putty, and improve the wet film properties of the liquid putty, such as leveling, sag resistance, in one embodiment, the film-forming adjuvant comprises at least one of an alcohol ester twelve, propylene glycol butyl ether, propylene glycol diacetate, dipropylene glycol dimethyl ether, ethylene glycol butyl ether, specific glycol methyl ether, propylene glycol, or benzyl alcohol, the mass of the film-forming adjuvant being less than or equal to 15 parts by weight based on 100 parts by weight of the first resin.
When the auxiliary agent includes a dispersant, the dispersant can improve the compatibility of the first resin with the first filler, and in one embodiment, the dispersant includes at least one of polyvinyl ether and its derivatives, polyacrylate, polymethacrylate, or salts of maleic anhydride-styrene copolymer, and the mass of the dispersant is less than or equal to 4 parts by weight based on 100 parts by weight of the first resin.
When the auxiliary agent comprises the thickening agent, the thickening agent can adjust the viscosity of the liquid putty, so that the liquid putty is prevented from being cooled during construction, the phenomenon of sagging of the liquid putty is caused, the good leveling property during construction is ensured, a smooth putty layer is formed, and the liquid putty is endowed with excellent storage stability.
In the production process of the liquid putty, a large amount of stable bubbles are not beneficial to smooth production and coating effect and performance in the coating process of the liquid putty, and a defoaming agent can be added for defoaming. When the auxiliary agent includes an antifoaming agent, the antifoaming agent can suppress the generation of bubbles and accelerate the collapse of generated bubbles, and in one embodiment, the antifoaming agent includes at least one of silicone antifoaming agent, polyether antifoaming agent, and fatty alcohol antifoaming agent, specifically, the antifoaming agent includes at least one of polydimethylsiloxane, polyoxyethylene polyoxypropylene pentaerythritol ether, polyoxyethylene polyoxypropylene amine ether, polyoxypropylene glycerol ether, and higher alcohol, and the mass of the antifoaming agent is less than or equal to 3 parts by weight based on 100 parts by weight of the first resin.
In one embodiment, the liquid putty further comprises a solvent, wherein the solvent is water, and the mass of the solvent is less than or equal to 500 parts by weight based on 100 parts by weight of the first resin.
In the cooling coating, when a putty layer formed by liquid putty and a radiation refrigeration finish paint layer with the sunlight reflectivity of 0.3-2.5 mu m wave band more than or equal to 82 percent are arranged in a laminated mode, the reflectivity of a cooling coating made of the cooling coating to the sunlight of 0.3-2.5 mu m wave band reaches more than 88 percent.
In one embodiment, the cooling coating comprises a radiation refrigeration coating matched with liquid putty, the sunlight reflectivity of a radiation refrigeration finish paint layer formed by the radiation refrigeration coating in a wave band of 0.3-2.5 μm is greater than or equal to 82%, and the atmospheric window emissivity in a wave band of 8-13 μm is greater than or equal to 88%.
It should be noted that when the thickness of the radiation refrigeration finish paint layer is 15 μm to 60 μm, the putty layer and the radiation refrigeration finish paint layer have a synergistic effect, so that the solar reflectance of the cooling coating layer in the 0.3 μm to 2.5 μm band is higher than that of the putty layer and the radiation refrigeration finish paint layer, in an embodiment, when the solar reflectance of the radiation refrigeration finish paint layer formed by the radiation refrigeration paint in the 0.3 μm to 2.5 μm band is greater than or equal to 82% and less than 88%, the reflectance of the cooling coating layer formed by the cooling paint to the solar of the 0.3 μm to 2.5 μm band reaches above 88%, therefore, in an embodiment, the solar reflectance of the radiation refrigeration finish paint layer formed by the radiation refrigeration paint in the 0.3 μm to 2.5 μm band is greater than or equal to 82%, preferably, the solar reflectance of the radiation refrigeration finish paint layer formed by the radiation refrigeration paint in the 0.3 μm to 2.5 μm band is greater than or equal to 82%, and less than 88%.
It should be noted that when the thickness of the radiation refrigeration finish paint layer is greater than 60 μm, the reflectivity of the putty layer cannot play a role well, and the sunlight reflectivity of the cooling coating layer in the wave band of 0.3 μm to 2.5 μm is lower than that of the putty layer and the radiation refrigeration finish paint layer, while when the thickness of the radiation refrigeration finish paint layer is less than 15 μm, the reflectivity of the radiation refrigeration finish paint layer cannot play a role well, and the sunlight reflectivity of the cooling coating layer in the wave band of 0.3 μm to 2.5 μm is lower than that of the putty layer and the radiation refrigeration finish paint layer.
The radiation refrigeration finish paint layer formed by the radiation refrigeration coating can emit heat through the atmospheric window in an infrared radiation mode, so that the cooling effect of the cooling coating is further improved, and the indoor temperature of a building can be further effectively reduced; in addition, the second filler and/or the third filler in the radiation refrigeration coating can improve the weather resistance of the cooling coating; the cooling coating can be subjected to color mixing through the selection of the types of the second filler and/or the third filler so as to meet the requirements of customers.
In one embodiment, the radiation-curable coating includes a second resin and a second filler and/or a third filler distributed in the resin.
In order to better improve the cooling effect of the cooling coating on the indoor space of the building, in one embodiment, the light transmittance of the second resin in the wave band of 0.3-2.5 μm is greater than or equal to 90%.
In one embodiment, the second resin includes at least one of an epoxy resin, a polyester resin, a polyurethane resin, an acrylic resin, or a silicone resin.
In one embodiment, the second filler comprises at least one of aluminum silicate, pearl powder, silicon dioxide, heavy calcium powder, barium sulfate, talc, titanium dioxide, zinc sulfide, ceramic powder, ceramic beads, or glass beads. In order to enable the cooling coating to better reduce the indoor temperature of the building, preferably, the reflectivity of the second filler to visible light and near infrared light is greater than or equal to 80%, and the infrared emissivity in an atmospheric window of 8-13 μm is greater than 80%, and specifically, the second filler preferably comprises at least one of aluminum silicate, pearl powder, heavy calcium powder, barium sulfate, talcum powder, titanium dioxide, zinc sulfide, ceramic powder, ceramic beads or glass beads; the mass of the second filler is 5 parts by weight to 80 parts by weight, more preferably 10 parts by weight to 40 parts by weight, based on 100 parts by weight of the second resin.
In an embodiment, the third filler comprises at least one of alumina, zinc oxide, zirconia, ceria, lanthana, rhodium oxide, or magnesia. In order to enable the cooling coating to better reduce the indoor temperature of the building, the reflectivity of the third filler to ultraviolet light and visible light is preferably greater than or equal to 80%, and the infrared emissivity in an atmospheric window of 8-13 μm is greater than 80%, and particularly, the third filler preferably comprises at least one of alumina, zirconia, ceria, lanthana or rhodium oxide; the mass of the third filler is 0.5 parts by weight to 20 parts by weight, and more preferably 0.5 parts by weight to 10 parts by weight, based on 100 parts by weight of the second resin.
The invention also provides an application method of the cooling coating, which comprises the following steps:
providing liquid putty, forming the liquid putty on the surface of the existing substrate, and drying to form a putty layer; and forming a radiation refrigeration finish paint layer on the surface of the putty layer far away from the existing matrix to obtain the cooling coating.
In one embodiment, a method of forming a radiation-refrigerated topcoat layer includes: and forming the radiation refrigeration coating on the surface of the putty layer, and drying to form the radiation refrigeration finish paint layer.
Optionally, the liquid putty may be formed on the surface of the existing substrate by brushing, rolling, spraying, or the like, and the radiation refrigeration coating may be formed on the surface of the putty layer by brushing, rolling, spraying, or the like.
In the cooling coating prepared by adopting the cooling coating, when the thickness of the radiation refrigeration finish paint layer is 15-60 mu m, the reflectivity of the cooling coating to sunlight with a wave band of 0.3-2.5 mu m is more than or equal to 88 percent, and the emissivity of an atmospheric window with a wave band of 8-13 mu m is more than or equal to 88 percent, so that the radiation refrigeration finish paint layer only needs one construction, the construction procedure is simple and convenient, the raw material cost and the construction cost of the radiation refrigeration finish paint layer 20 can be effectively reduced, and the raw material cost and the construction cost of the cooling coating are further reduced.
In addition, the cooling coating prepared by the cooling coating has excellent artificial climate aging resistance, and in one embodiment, the weather resistance of the cooling coating is tested by referring to GB/T9755-.
As shown in fig. 1, the cooling coating of an embodiment made of the cooling coating includes a putty layer 10 disposed on a surface of an existing substrate, wherein a base material of the putty layer 10 is a first resin, and first fillers 101 are distributed in the putty layer 10.
In this embodiment, the cooling coating further includes a radiation refrigeration finish paint layer 20 with a thickness of 15 μm to 60 μm, and the radiation refrigeration finish paint layer 20 is stacked on the surface of the putty layer 10 away from the existing substrate.
In one embodiment, the matrix material of the radiation refrigeration topcoat layer 20 is a second resin, and the second filler 201 and/or the third filler 202 are distributed in the radiation refrigeration topcoat layer.
In one embodiment, the thickness of the putty layer 10 is less than or equal to 1mm for better reducing the production cost of the cooling coating.
In an embodiment, the cooling coating further includes a protective layer 30, and the protective layer 30 is stacked on the surface of the radiation refrigeration topcoat layer 20 away from the putty layer 10, so as to provide surface protection, prevent the cooling effect of the cooling coating from being reduced due to surface contamination, and simultaneously improve the weather resistance of the cooling coating.
In one embodiment, the material of the protective layer 30 includes one or more of polyacrylic resin, polyurethane resin, fluorocarbon resin, and silicone resin.
When the cooling coating is applied, the cooling coating is arranged on the surface of the existing substrate, wherein the surface of the radiation refrigeration finish paint layer 20 of the cooling coating, which is far away from the putty layer 10, is a light incident side, or when the cooling coating is also provided with the protective layer 30, the surface of the protective layer 30, which is far away from the radiation refrigeration finish paint layer 20, is a light incident side.
Specifically, the existing substrate includes an exterior wall or a roof of a building.
In one embodiment, a leveling layer is further stacked between the existing base body and the cooling coating, and the leveling layer is beneficial to increasing the adhesive force of the cooling coating on the existing base material. The leveling layer can be cement plastering mortar, gypsum mortar or external wall liquid putty, etc.
The present invention will be described in further detail with reference to specific examples and comparative examples. It is understood that the following examples are more specific to the apparatus and materials used, and in other embodiments, are not limited thereto.
Example 1
The cooling coating of embodiment 1, comprising liquid putty and radiation refrigeration coating used in cooperation with the liquid putty.
Wherein the liquid putty comprises a first resin: 100 parts by weight of an epoxy resin, a first filler: 500 parts by weight of barium sulfate, film-forming aid: 9.1 parts by weight of alcohol ester twelve, dispersant: 1.8 parts by weight of polymethacrylate, thickener: 0.9 parts by weight of associative polyurethane thickener, defoamer: 0.1 part by weight of polydimethylsiloxane, solvent: 25 parts by weight of water, wherein the elastic modulus of the epoxy resin is 1.6MPa, and the sunlight transmittance in a wave band of 0.3-2.5 μm is 91.2%.
The radiation refrigeration coating comprises a second resin: 100 parts by weight of an epoxy resin, a second filler: 8 parts by weight of titanium dioxide, a third filler: 4 parts by weight of alumina.
Forming liquid putty on the surface of the existing substrate roof, and drying to form a putty layer 10, wherein the thickness of the putty layer 10 is 0.5 mm; and forming the radiation refrigeration coating on the surface of the putty layer 10, and drying to form a radiation refrigeration finish paint layer 20, wherein the thickness of the radiation refrigeration finish paint layer 20 is 30 mu m, so as to obtain the cooling coating.
Example 2
Example 2 the embodiment of example 1 is referenced, except that the thickness of the radiant refrigeration topcoat layer 20 is 20 μm.
Example 3
Example 3 the embodiment of example 1 is referenced, except that the thickness of the radiant refrigeration topcoat layer 20 is 60 μm.
Example 4
Example 4 the embodiment of example 1 was referenced except that the radiation refrigeration coating included a second resin: 100 parts by weight of an epoxy resin, a second filler: 8 parts of titanium dioxide.
Example 5
Example 5 the embodiment of example 1 was referenced, except that the radiation refrigeration coating included a second resin: 100 parts by weight of an epoxy resin, a third filler: 4 parts by weight of alumina.
Example 6
Example 6 the embodiment of example 1 is referred to, except that the first filler in the liquid putty: 200 parts by weight of calcium carbonate.
Example 7
Example 7 the embodiment of example 1 is referenced, except that the first filler in the liquid putty: 700 parts by weight of calcium carbonate.
Example 8
Example 8 the embodiment of example 1 was referenced, except that the first resin in the liquid putty: 100 parts by weight of polyurethane resin, wherein the elastic modulus of the polyurethane resin is 1.6MPa, and the sunlight transmittance in a wave band of 0.3-2.5 mu m is 92.2%.
Example 9
Example 9 the embodiment of example 1 was referenced, except that the first resin in the liquid putty: 100 parts by weight of polyacrylate resin, wherein the elastic modulus of the polyacrylate resin is 2.2MPa, and the sunlight transmittance in a wave band of 0.3-2.5 μm is 93.3%.
Example 10
Example 10 the embodiment of example 1 was referenced, except that the first resin in the liquid putty was replaced with a silicone resin having an elastic modulus of 1.8MPa and a solar light transmittance of 87.4% in the 0.3 μm to 2.5 μm wavelength band.
Comparative example 1
Comparative example 1 the embodiment of example 1 is referenced, except that the first filler in the liquid putty: 500 parts by weight of silica.
Comparative example 2
Comparative example 2 the embodiment of example 1 was referenced, except that the thickness of the radiant refrigeration topcoat layer 20 was 70 μm.
Comparative example 3
Comparative example 3 the embodiment of example 1 is referred to with the difference that the thickness of the radiation refrigeration topcoat layer 20 is 13 μm.
Comparative example 4
Comparative example 4 the embodiment of example 1 is referenced, except that the first filler in the liquid putty: 500 parts by weight of talc powder.
Comparative example 5
Comparative example 5 the embodiment of example 1 was referenced, except that the reduced temperature coating did not include a radiant cooling topcoat layer.
Comparative example 6
Comparative example 6 the embodiment of example 1 was referenced, except that the radiation-curable coating material did not contain the second filler and the third filler, and correspondingly, the radiation-curable topcoat layer did not contain the second filler and the third filler.
The optical properties of the above examples 1 to 10 and comparative examples 1 to 6 were measured, and the test criteria are as follows, and the test results are shown in Table 1.
Solar reflectance: reference is made to the specification of 6.4 in JG/T235-2014.
Atmospheric window emissivity: reference is made to the specification of T/ZZB 2304-2021.
TABLE 1
Figure BDA0003291111830000141
Figure BDA0003291111830000151
In Table 1, the reflectance to sunlight represents the reflectance to sunlight of a wavelength band of 0.3 μm to 2.5 μm; the emissivity at the atmospheric window represents the emissivity at the atmospheric window in the 8 μm-13 μm band.
The artificial weather aging resistance of the cooling coatings of the above examples 1-10 and comparative examples 1-6 is tested by referring to the specification of GB/T9755-: the temperature-reducing coatings provided by examples 1-10 and comparative examples 1-4 have no bubbling, peeling and cracks within 600h, the temperature-reducing coating provided by comparative example 5 has abnormal conditions such as bubbling and peeling within 60h, and the temperature-reducing coating provided by comparative example 6 has abnormal conditions such as bubbling and peeling within 400 h.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above examples only show some embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (5)

1. A cooling coating is characterized by comprising a putty layer arranged on the surface of an existing matrix and a radiation refrigeration finish paint layer which is arranged on the surface of the putty layer far away from the existing matrix in a laminated manner;
the sunlight reflectivity of the putty layer at a wave band of 0.3-2.5 microns is larger than or equal to 88%, the thickness of the putty layer is smaller than or equal to 1mm, a base material of the putty layer is first resin, first fillers are distributed in the putty layer, the sunlight transmittance of the first resin at a wave band of 0.3-2.5 microns is larger than or equal to 90%, the first resin comprises at least one of epoxy resin, polyester resin, polyacrylate resin, polyamide resin, polyurethane resin, polyolefin resin or fluororesin, the sunlight reflectivity of the first fillers at a wave band of 0.3-2.5 microns is larger than or equal to 85%, and the first fillers comprise at least one of calcium carbonate, barium sulfate, aluminum oxide, ceramic powder, aluminum silicate, talcum powder, titanium dioxide, magnesium oxide, ceramic beads or glass beads;
the thickness of the radiation refrigeration finish paint layer is 15-60 mu m, the sunlight reflectivity of the radiation refrigeration finish paint layer in a wave band of 0.3-2.5 mu m is greater than or equal to 82%, the atmospheric window emissivity in a wave band of 8-13 mu m is greater than or equal to 88%, the base material of the radiation refrigeration finish paint layer is second resin, second filler and/or third filler are/is further distributed in the radiation refrigeration finish paint layer, the second resin comprises at least one of epoxy resin, polyester resin, polyurethane resin, acrylic resin or organic silicon resin, the second filler comprises at least one of aluminum silicate, pearl powder, silicon dioxide, heavy calcium powder, barium sulfate, talcum powder, titanium white, zinc sulfide, ceramic powder, ceramic beads or glass beads, and the third filler comprises aluminum oxide, zinc oxide, zirconium oxide, At least one of cerium oxide, lanthanum oxide, rhodium oxide, or magnesium oxide;
the reflectivity of the cooling coating to sunlight with a wave band of 0.3-2.5 μm reaches over 88%, and the emissivity of an atmospheric window with a wave band of 8-13 μm is greater than or equal to 88%.
2. The cooling coating of claim 1, wherein the first filler has a reflectivity of 85% or more of ultraviolet light, visible light, and infrared light of sunlight.
3. The cooling coating of claim 1, wherein the mass of the first filler is 200 parts by weight to 700 parts by weight based on 100 parts by weight of the first resin.
4. The temperature reduction coating of claim 1, wherein the first resin has an elastic modulus of less than or equal to 2 MPa.
5. The cooling coating according to any one of claims 1-4, wherein the putty layer further comprises an auxiliary agent, the auxiliary agent comprises at least one of a film forming auxiliary agent, a dispersing agent, a thickening agent or a defoaming agent, and the mass of the auxiliary agent is less than or equal to 25 parts by weight based on 100 parts by weight of the first resin.
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