CN111100551A - Repairing agent and application thereof - Google Patents
Repairing agent and application thereof Download PDFInfo
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- CN111100551A CN111100551A CN201911425211.9A CN201911425211A CN111100551A CN 111100551 A CN111100551 A CN 111100551A CN 201911425211 A CN201911425211 A CN 201911425211A CN 111100551 A CN111100551 A CN 111100551A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING 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
- C09D183/00—Coating 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
- C09D183/04—Polysiloxanes
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING 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
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/38—Paints containing free metal not provided for above in groups C09D5/00 - C09D5/36
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/08—Metals
- C08K2003/0806—Silver
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/08—Metals
- C08K2003/0812—Aluminium
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/002—Physical properties
- C08K2201/003—Additives being defined by their diameter
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Abstract
The invention relates to a repairing agent, which comprises a first solvent and a film forming agent dispersed in the first solvent, wherein the molecular chain of the film forming agent comprises silicon hydroxyl, the repairing agent is used for forming a repairing layer, and the heat reflectivity of a radiation refrigeration film is m1Having a heat absorption rate of n1A thermal reflectance of the radiation refrigerating film including the repair layer is m2Having a heat absorption rate of n2，m2‑m1The difference of (a) is x, x is not less than-5%, n2‑n1The difference is y which is less than or equal to 3 percent. The repairing agent forms a chemical bond with the damaged part of the radiation refrigeration film, has good adhesive force with the radiation refrigeration film, and does not influence the refrigeration effect of the radiation refrigeration film.
Description
Technical Field
The invention relates to the technical field of radiation refrigeration, in particular to a repairing agent and application thereof.
Background
Radiation refrigeration refers to a refrigeration mode of directly releasing heat from an atmospheric window to outer space through an infrared radiation mode. The radiation refrigeration is characterized in that the surface temperature of a refrigeration body is constantly lower than the air temperature, and then the temperature of the radiation refrigeration body is reduced to be lower than the air temperature through conduction, so that the purpose of the radiation refrigeration is achieved.
At present, the radiation refrigeration products which are marketed are mainly radiation refrigeration films, and the radiation refrigeration films can be adhered to the outer surfaces of objects to be cooled according to use requirements. The radiation refrigeration film is thin and easy to damage in the using process, the radiation refrigeration efficiency of the radiation refrigeration film can be influenced after the radiation refrigeration film is damaged, and the reflection coating in the radiation refrigeration film is easy to oxidize or corrode after being contacted with water oxygen in the air, so that the reflection function of the radiation refrigeration film is influenced, and the service life of the radiation refrigeration film is shortened. The existing repairing agent induces macromolecule crosslinking through a curing agent, an initiator or a catalyst in the coating, and has the disadvantages of complex film forming process, high coating cost and inconvenience for practical use.
Disclosure of Invention
In view of the above, there is a need to provide a repairing agent and an application thereof, which have simple film forming process, good film forming performance and small influence of the repairing layer on the refrigeration efficiency of the radiation refrigeration film.
According to one aspect of the invention, the repairing agent comprises a first solvent and a film forming agent dispersed in the first solvent, wherein the molecular chain of the film forming agent comprises silicon hydroxyl, the repairing agent is used for forming a first repairing layer on the surface of a radiation refrigerating film, and the thermal reflectivity of the radiation refrigerating film is m1Having a heat absorption rate of n1The thermal reflectivity of the radiation refrigeration film comprising the first repairing layer is m2Having a heat absorption rate of n2，m2-m1Is x1，x1≥-5％、n2-n1Is a difference of y1，y1≤3％。
In one embodiment, the film forming agent comprises at least one of methyl phenyl silicone resin, methyl silicone resin and dihydroxy polydimethylsiloxane;
and/or the first solvent comprises at least one of propylene glycol methyl ether acetate, ethyl acetate and propylene glycol.
In one embodiment, the mass ratio of the film forming agent to the first solvent in the repairing agent is (800-1000): 100-400), and the viscosity of the repairing agent is 100 cst-2000 cst.
In one embodiment, the repairing agent further comprises an antifoaming agent, and the mass ratio of the antifoaming agent to the film forming agent is (1-5): (800-1000);
and/or the repairing agent further comprises a flatting agent, and the mass ratio of the flatting agent to the film forming agent is (1-5): 800-1000.
In one embodiment, the repairing agent further comprises a metal paste, the metal paste comprises a second solvent and metal particles dispersed in the second solvent, the repairing agent is used for forming a second repairing layer on the surface of the radiation refrigerating film, the second repairing layer has a reflectivity of more than 80% to solar radiation in a wave band of 300 nm-2500 nm, and the thermal reflectivity of the radiation refrigerating film comprising the second repairing layer is m3Having a heat absorption rate of n3，m3-m1Is x1，x1Not less than-1%, the difference between n3-n1 is y1，y1≤1％。
In one embodiment, in the repairing agent, the mass ratio of the metal paste to the film forming agent is (100-300): (800-1000).
In one embodiment, the mass fraction of the metal particles in the metal slurry is 10-50%;
and/or the particle size of the metal particles is 5-8 μm.
In one embodiment, the metal particles comprise silver particles and aluminum particles.
In one embodiment, the mass fraction of the silver particles in the metal particles is 10% to 30%.
In one embodiment, the metal particles are in a snowflake shape, and the aluminum particles are directionally arranged on the surface of the metal paste and form an aluminum film.
According to another aspect of the present invention, there is provided a use of a repair agent for repairing a radiation refrigerating film.
Compared with the prior art, the preparation method has the beneficial effects that:
the molecular chain of the film forming agent comprises active silicon hydroxyl, and the film forming agent can form a film with a damaged part on the refrigeration film to be radiated through forming a chemical bond, and the formed repairing layer has good adhesive force. And the heat reflectivity and the heat absorptivity of the radiation refrigeration film comprising the repairing layer are less influenced, so that the refrigeration effect of the radiation refrigeration film is not influenced.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
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 terms "first," "second," and the like herein are used for distinguishing between different objects and not necessarily for describing a particular order. Furthermore, the terms "including" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions.
As used herein, "solar radiation" refers primarily to electromagnetic radiation having a wavelength of from about 300nm to 2.5 μm.
"reflectivity" as used herein with respect to a material or structure is the fraction of any incident electromagnetic radiation that is reflected off a surface. A perfect reflector is defined as having a reflectivity of 1 and a perfect absorber is defined as having a reflectivity of zero. High reflectivity, as used herein, means that the material or structure has a reflectivity greater than about 80% within a specified range.
As used herein with respect to a material or structure, "emissivity" is its effectiveness in emitting energy in the form of electromagnetic radiation. A perfect black body emitter is defined as having an emissivity of 1, and a perfect non-emitter is defined as having an emissivity of zero. High emissivity, as used herein, means that the material or structure has an emissivity greater than about 80% over a specified range.
"transmittance" as used herein with respect to a material or structure refers to the proportion of electromagnetic waves that are transmitted through the material or structure within a specified wavelength band. An opaque material or structure is defined as having zero transmission. As used herein, high transmittance means that the material or structure has a transmittance of greater than about 80% within the specified range.
The invention provides a repairing agent, which comprises a first solvent and a film forming agent dispersed in the first solvent, wherein the molecular chain of the film forming agent comprises silicon hydroxyl, the repairing agent is used for forming a first repairing layer, and the heat reflectivity of a radiation refrigerating film is m1Having a heat absorption rate of n1The thermal reflectivity of the radiation refrigeration film comprising the first repairing layer is m2Having a heat absorption rate of n2，m2-m1Is x1，x1≥-5％、n2-n1Is a difference of y1，y1≤3％。
When the radiation refrigeration film is scratched or damaged, the radiation refrigeration film can be quickly repaired by coating the repairing agent, and the repairing agent reacts with free radicals at the damaged part of the radiation refrigeration film and forms a chemical bond, so that the radiation refrigeration film has good interface bonding force and adhesive force, and the service life of the radiation refrigeration film is prolonged. The acting force between chemical bonds is strong and can be quickly formed, so that the repairing agent can be quickly attached to the damaged part of the radiation refrigeration film and can form a film, the process is simple, and the polymerization reaction does not need to be triggered by a curing agent, an initiator or a catalyst during film forming.
In addition, the radiation refrigeration film comprising the repairing layer has small influence on the heat reflectivity and the heat absorptivity, so that the refrigeration effect of the radiation refrigeration film is not influenced. The increased heat absorption rate is limited and does not affect the refrigeration effect of the radiation refrigeration film.
It should be noted that, the existing radiation refrigeration film generally includes a radiation refrigeration functional layer and a protective layer located on the outer surface of the radiation refrigeration functional layer, and when the radiation refrigeration film is used outdoors, the radiation refrigeration film is required to be tested under severe weather conditions, and the radiation refrigeration film provided with the protective layer has good weather resistance.
Generally, the protective layer includes one or more of an organic fluoropolymer layer, a silicone polymer layer, a fluorosilicone copolymer resin layer, a polyethylene-nylon composite film layer, an ethylene-vinyl alcohol copolymer layer, and a polypropylene-nylon composite film layer. The protective layer material has excellent optical property, weather resistance and barrier property, and further has excellent transparency, heat resistance, oxidation resistance, chemical resistance and corrosion resistance. And the thickness of the protective layer is between 1 μm and 300 μm. The repairing agent provided by the invention is particularly suitable for a radiation refrigerating film with a transparent surface layer, and the formed repairing layer can enable the radiation refrigerating film to still keep higher heat reflectivity.
Furthermore, in the repairing agent, the mass ratio of the film forming agent to the first solvent is (800-1000): 100-400, and the viscosity of the repairing agent is 100 cst-2000 cst, preferably, the viscosity of the repairing agent is 100 cst-300 cst. The repairing agent can be coated on the radiation refrigeration film easily and can be rapidly solidified into a film due to certain viscosity. If the molecular weight of the film forming agent is too large, the film forming agent is not easy to be uniformly dispersed in the first solvent, so that the formation of chemical bonds between the repairing agent and the radiation refrigeration film is influenced; if the molecular weight of the film-forming agent is too low, the viscosity of the formed repair agent is too low, and the film is not easily formed.
The molecular chain of the film forming agent comprises silicon hydroxyl, and the material of the film forming agent can be at least one of methyl phenyl silicone resin, methyl silicone resin and dihydroxy polydimethylsiloxane. It is understood that in other embodiments, the film forming agent may be other silicone resins or siloxanes having silicon hydroxyl groups, which is not limited by the present invention.
Further, the first solvent is used to dissolve the film forming agent and soften the damaged portion of the radiation refrigerating film, and thus the first solvent is preferably an organic solvent. Specifically, the first solvent can be, but is not limited to, at least one of propylene glycol methyl ether acetate, ethyl acetate and propylene glycol, and the first solvent provided by the invention has good solubility for the film forming agent and can enable silicon hydroxyl groups in the film forming agent to be always in an active state. It should be noted that, on the premise of not affecting the dispersing effect of the film forming agent, the first solvent may also be other organic solvents, which is not limited in the present invention.
Further, the repairing agent also comprises a leveling agent which is beneficial to forming a relatively flat surface on the damaged part of the radiation refrigeration film, and the leveling agent can be but is not limited to Pick BYK-420. The leveling agent and the repairing agent have better intersolubility, and the surface tension of the repairing agent can be effectively reduced. Preferably, in the repairing agent, the mass ratio of the flatting agent to the film forming agent is (1-5): 800-1000.
Further, the repairing agent also comprises an antifoaming agent which is used for removing air in the repairing agent so as not to influence the heat reflectivity and the heat absorptivity of the formed repairing layer, and the antifoaming agent can be but is not limited to B-106. The defoaming agent has high defoaming speed and long foam inhibition time, and has better intersolubility with the first solvent and the film forming agent. Preferably, in the repairing agent, the mass ratio of the defoaming agent to the film forming agent is (1-5) to (800-1000).
Further, the repairing agent also comprises metal slurry used for repairing the radiation refrigerating film containing the reflecting metal coating. When the reflective metal coating in the radiation refrigerating film is damaged, the reflective metal coating is easily oxidized or corroded after contacting with water and oxygen in the air, so that the reflection performance of the radiation refrigerating film is influenced.
Therefore, one embodiment of the present invention can repair the reflective metal plating layer in the radiation refrigeration film by adding the metal paste having a certain reflective function to the repair agent. For a repairing agent with a metal paste, the metal paste comprises a second solvent and metal particles dispersed in the second solvent, the repairing agent is used for forming a second repairing layer, and the second repairing layerThe solar radiation with the wave band of 300 nm-2500 nm has the reflectivity of more than 80%, and the thermal reflectivity of the radiation refrigeration film comprising the second repairing layer is m3Having a heat absorption rate of n3，m3-m1Is x1，x1Not less than-1%, the difference between n3-n1 is y1，y1Less than or equal to 1 percent. The addition of the metal paste enables the repair agent to repair the reflective metal coating and make up for the reflectivity gap.
The metal paste includes a second solvent and metal particles dispersed in the second solvent, and the metal particles may be, but are not limited to, a mixture of silver particles and aluminum particles. In other embodiments, the metal particles in the metal paste may also be other metal or ceramic materials, such as at least one metal of chromium, titanium, copper and nickel, and at least one ceramic layer of aluminum oxide, titanium oxide, silicon oxide, niobium oxide, zinc oxide, indium oxide, tin oxide, silicon nitride, titanium nitride, aluminum silicide, zinc sulfide, indium sulfide, tin sulfide, magnesium fluoride and calcium fluoride, and the invention is not limited to the kind of the metal particles provided that the metal paste has a certain reflective function.
Preferably, the mass fraction of the metal particles in the metal paste is 10% to 50%. More preferably, the mass fraction of the metal particles is 30%.
The second solvent has better intersolubility with the repairing agent, and is preferably, but not limited to, an oily petroleum solvent.
Further, the metal particles include silver particles and aluminum particles. More preferably, the metal particles have a mass fraction of silver particles of 10% to 30% and a mass fraction of aluminum particles of 70% to 90%.
Preferably, the metal particles have a particle size of 5 μm to 8 μm, and the particle size of the metal particles is relatively concentrated, so that the particles are easily uniformly dispersed in the repairing agent, and are not easily settled and non-uniform.
Preferably, the metal particles have a snowflake shape, and the snowflake shape has a more complex surface structure on a microscopic scale, a larger specific surface area, and thus a higher reflectivity, compared to the needle-shaped or spherical metal particles. The metal particles in the metal slurry are in a floating type, and the aluminum particles are directionally arranged on the surface of the metal slurry and form a layer of opaque aluminum film, so that the repairing agent has high reflectivity.
Furthermore, in the film forming agent, the mass ratio of the metal paste to the film forming agent is (100-300): 800-1000.
It should be noted that the repairing agent provided by the present invention has easily available components, has a good film forming property, and does not affect the refrigeration property of the radiation refrigeration film, so that the repairing agent can be used as a base coating, and other additives, such as a filler with radiation refrigeration property or a film forming aid capable of improving the film forming property, can be added to the repairing agent provided by the present invention, which is not limited by the present invention.
According to another aspect of the present invention, there is provided the use of a restoration agent according to any one of the above for restoring a radiation refrigerating film.
Hereinafter, preferred examples and comparative examples are set forth for a better understanding of the present invention. However, the following examples are merely illustrative of the present invention and are not intended to be limiting or restrictive.
Example 1:
a restorative agent a comprising:
800 parts by weight of a methylphenyl silicone resin;
400 parts by weight of propylene glycol methyl ether acetate;
2 parts by weight of a German Bike leveling agent BYK-420;
5 parts by weight of a federally produced B-106 defoamer in Guangzhou.
Example 2:
a repairing agent B comprising:
900 parts by weight of methyl silicone resin;
300 parts by weight of ethyl acetate;
5 parts by weight of a German Bike leveling agent BYK-420;
3 parts by weight of a federally produced B-106 defoamer in guangzhou.
Example 3:
a repairing agent C comprising:
1000 parts by weight of dihydroxy polydimethylsiloxane;
200 parts by weight of propylene glycol;
4 parts by weight of a German Bike leveling agent BYK-420;
1 part by weight of federally produced B-106 antifoam agent in guangzhou.
Example 4:
a remediation agent D comprising:
800 parts by weight of methyl silicone resin;
100 parts by weight of propylene glycol methyl ether acetate;
3 parts by weight of a German Bike leveling agent BYK-420;
2 parts by weight of a federally produced B-106 defoamer in guangzhou.
Example 5:
a remediation agent E comprising:
900 parts by weight of methyl silicone resin;
150 parts by weight of propylene glycol methyl ether acetate;
2.5 parts by weight of a German Bike leveling agent BYK-420;
2.5 parts by weight of a federally produced B-106 defoamer in guangzhou.
Example 6:
a repairing agent F comprising:
900 parts by weight of methyl silicone resin;
300 parts by weight of ethyl acetate;
5 parts by weight of a German Bike leveling agent BYK-420;
3 parts by weight of a federally produced B-106 defoamer in guangzhou;
100 parts by weight of a metal paste;
the metal slurry comprises a petroleum solvent and metal particles dispersed in the petroleum solvent, the metal particles comprise silver particles and aluminum particles, and the mass fraction of the metal particles in the metal slurry is 10%. The mass fraction of the silver particles in the metal particles is 30%, the particle size of the silver particles is 6 μm, the particle size of the aluminum particles is 8 μm, and the metal particles are snowflake-shaped.
Example 7:
a repairing agent G comprising:
900 parts by weight of methyl silicone resin;
300 parts by weight of ethyl acetate;
5 parts by weight of a German Bike leveling agent BYK-420;
3 parts by weight of a federally produced B-106 defoamer in guangzhou;
200 parts by weight of a metal paste;
the metal slurry comprises a petroleum solvent and metal particles dispersed in the petroleum solvent, the metal particles comprise silver particles and aluminum particles, and the mass fraction of the metal particles in the metal slurry is 20%. The mass fraction of the silver particles in the metal particles is 20%, the particle size of the silver particles is 5 μm, the particle size of the aluminum particles is 7 μm, and the metal particles are snowflake-shaped.
Example 8:
a repair agent H comprising:
900 parts by weight of methyl silicone resin;
300 parts by weight of ethyl acetate;
5 parts by weight of a German Bike leveling agent BYK-420;
3 parts by weight of a federally produced B-106 defoamer in guangzhou;
300 parts by weight of a metal paste;
the metal slurry comprises a petroleum solvent and metal particles dispersed in the petroleum solvent, the metal particles comprise silver particles and aluminum particles, and the mass fraction of the metal particles in the metal slurry is 30%. The mass fraction of the silver particles in the metal particles is 15%, the particle size of the silver particles is 8 μm, the particle size of the aluminum particles is 5 μm, and the metal particles are snowflake-shaped.
Example 9:
a repairing agent I comprising:
900 parts by weight of methyl silicone resin;
300 parts by weight of ethyl acetate;
5 parts by weight of a German Bike leveling agent BYK-420;
3 parts by weight of a federally produced B-106 defoamer in guangzhou;
150 parts by weight of a metal paste;
the metal slurry comprises a petroleum solvent and metal particles dispersed in the petroleum solvent, the metal particles comprise silver particles and aluminum particles, and the mass fraction of the metal particles in the metal slurry is 50%. The mass fraction of the silver particles in the metal particles is 10%, the particle size of the silver particles is 7 μm, the particle size of the aluminum particles is 6 μm, and the metal particles are snowflake-shaped.
Comparative example 1:
a healing agent J comprising:
900 parts by weight of methyl silicone resin;
300 parts by weight of ethyl acetate;
5 parts by weight of a German Bike leveling agent BYK-420;
3 parts by weight of a federally produced B-106 defoamer in guangzhou;
150 parts by weight of a metal paste;
the metal slurry comprises a petroleum solvent and metal particles dispersed in the petroleum solvent, the metal particles comprise silver particles, and the mass fraction of the metal particles in the metal slurry is 50%. The mass fraction of the silver particles in the metal particles was 10%, the particle size of the silver particles was 7 μm, and the shape of the metal particles was smooth spherical.
Comparative example 2
A repairing agent K comprising:
900 parts by weight of methyl silicone resin;
300 parts by weight of ethyl acetate;
5 parts by weight of a German Bike leveling agent BYK-420;
3 parts by weight of a federally produced B-106 defoamer in guangzhou;
150 parts by weight of a metal paste;
the metal slurry comprises a petroleum solvent and metal particles dispersed in the petroleum solvent, the metal particles comprise silver particles, and the mass fraction of the metal particles in the metal slurry is 50%. The mass fraction of the silver particles in the metal particles was 10%, the particle size of the silver particles was 8 μm, and the shape of the metal particles was needle-like.
1. The repairing layers formed by the repairing agents A to I prepared in the embodiments 1 to 9 on the damaged radiation refrigerating film are subjected to a grid drawing test of a colored paint and a varnish paint film, and the grades of the repairing layers formed by the tests are V0 grades, which shows that the combination between the repairing layers and the radiation refrigerating film is firmer.
2. The repairing agents a to E prepared in examples 1 to 5 were coated on the radiation refrigeration film, and the heat reflection amount, heat reflection rate, heat absorption amount, heat absorption rate, and emissivity of the radiation refrigeration film obtained by repairing the radiation refrigeration film after the radiation refrigeration film and the protective layer of the radiation refrigeration film were damaged were measured, respectively, and the results are shown in table 1, where the heat reflection rate is the heat reflection rate of solar radiation in a wavelength band of 300nm to 2500nm, the heat absorption rate is the heat absorption rate of solar radiation in a wavelength band of 300nm to 2500nm, and the emissivity is the emissivity in an atmospheric window of 7 to 14 μm.
TABLE 1
3. The repairing agents F to I prepared in examples 6 to 9 and the repairing agents J to K prepared in comparative examples 1 to 2 were coated on the radiation refrigeration film, and the heat reflection amount, the heat reflection rate, the heat absorption amount, the heat absorption rate, and the emissivity of the radiation refrigeration film obtained by repairing the radiation refrigeration film after the radiation refrigeration film and the reflective metal coating of the radiation refrigeration film were damaged were measured, respectively, and the results are shown in table 2, where the heat reflection rate is the heat reflection rate of solar radiation in a wavelength band of 300nm to 2500nm, the heat absorption rate is the heat absorption rate of solar radiation in a wavelength band of 300nm to 2500nm, and the emissivity is the emissivity in an atmospheric window of 7 to 14 μm.
TABLE 2
According to the test results, after the damaged radiation refrigeration film is repaired, the heat reflectivity ratio of the repair agent provided by the invention is reduced by less than or equal to 5%, the heat absorptivity of the repair agent is increased by less than or equal to 3%, the influence on the refrigeration effect of the radiation refrigeration film is small, and the influence on the refrigeration effect of the radiation refrigeration film is small.
In addition, the repairing agent added with the metal paste can improve the reflectivity of the radiation refrigeration film, reduce the heat absorption rate of the radiation refrigeration film and have small influence on the refrigeration effect of the radiation refrigeration film.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several 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 (11)
1. The repairing agent is characterized by comprising a first solvent and a film forming agent dispersed in the first solvent, wherein the molecular chain of the film forming agent comprises silicon hydroxyl, and the repairing agent is characterized by comprisingThe complex agent is used for forming a first repairing layer on the surface of the radiation refrigerating film, and the thermal reflectivity of the radiation refrigerating film is m1Having a heat absorption rate of n1The thermal reflectivity of the radiation refrigeration film comprising the first repairing layer is m2Having a heat absorption rate of n2，m2-m1Is x1，x1≥-5％、n2-n1Is a difference of y1，y1≤3％。
2. The repair agent of claim 1 wherein the film former comprises at least one of a methyl phenyl silicone resin, a methyl silicone resin, a dihydroxy polydimethylsiloxane;
and/or the first solvent comprises at least one of propylene glycol methyl ether acetate, ethyl acetate and propylene glycol.
3. The repairing agent according to claim 1, wherein the mass ratio of the film forming agent to the first solvent in the repairing agent is (800-1000): (100-400), and the viscosity of the repairing agent is 100 cst-2000 cst.
4. The repairing agent according to claim 1, wherein the repairing agent further comprises an antifoaming agent, and the mass ratio of the antifoaming agent to the film forming agent is (1-5): (800-1000);
and/or the repairing agent further comprises a flatting agent, and the mass ratio of the flatting agent to the film forming agent is (1-5): 800-1000.
5. The repairing agent according to any one of claims 1 to 4, further comprising a metal paste, wherein the metal paste comprises a second solvent and metal particles dispersed in the second solvent, the repairing agent is used for forming a second repairing layer on the surface of the radiation refrigerating film, the second repairing layer has a reflectivity of 80% or more for solar radiation in a wavelength band of 300nm to 2500nm, and the thermal reflectivity of the radiation refrigerating film comprising the second repairing layer is m3Heat absorptionYield is n3，m3-m1Is x1，x1Not less than-1%, the difference between n3-n1 is y1，y1≤1％。
6. The repair agent according to claim 5, wherein the mass ratio of the metal paste to the film-forming agent in the repair agent is (100-300): (800-1000).
7. The repair agent according to claim 5, wherein the metal particles account for 10-50% by mass of the metal paste;
and/or the particle size of the metal particles is 5-8 μm.
8. The repair agent according to claim 5, wherein the metal particles comprise silver particles and aluminum particles.
9. The repair agent according to claim 8, wherein the silver particles account for 10 to 30 mass% of the metal particles.
10. The repair agent according to claim 8, wherein the metal particles have a snowflake shape, and the aluminum particles are aligned on the surface of the metal paste and form an aluminum film.
11. Use of a healing agent for healing a radiation refrigerating film.
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| CN201911425211.9A CN111100551B (en) | 2019-12-31 | 2019-12-31 | Repairing agent and application thereof |
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| CN201911425211.9A CN111100551B (en) | 2019-12-31 | 2019-12-31 | Repairing agent and application thereof |
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| CN115004982A (en) * | 2022-07-22 | 2022-09-06 | 威海智洁环保技术有限公司 | Low-carbon, environment-friendly and efficient saline-alkali soil restoration method based on radiation refrigeration |
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