CN113999579A - Diffuse reflection paint and diffuse reflection coating - Google Patents

Diffuse reflection paint and diffuse reflection coating Download PDF

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Publication number
CN113999579A
CN113999579A CN202111276731.5A CN202111276731A CN113999579A CN 113999579 A CN113999579 A CN 113999579A CN 202111276731 A CN202111276731 A CN 202111276731A CN 113999579 A CN113999579 A CN 113999579A
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Prior art keywords
coating
resin
filler
diffuse reflection
parts
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CN113999579B (en
Inventor
万容兵
陈孝行
万亚飞
杨荣贵
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Ningbo Ruiling New Energy Materials Research Institute Co ltd
Ningbo 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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    • 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
    • C09D133/00—Coating 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/50—Multilayers
    • B05D7/52—Two layers
    • B05D7/54—No clear coat specified
    • B05D7/544—No clear coat specified the first layer is let to dry at least partially before applying the second layer
    • 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
    • C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
    • 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
    • C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
    • C09D175/04—Polyurethanes
    • 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
    • C09D5/004—Reflecting paints; Signal paints
    • 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
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/60—Additives non-macromolecular
    • C09D7/61—Additives non-macromolecular inorganic
    • 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
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/70—Additives characterised by shape, e.g. fibres, flakes or microspheres
    • 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
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20—Oxides; Hydroxides
    • C08K3/22—Oxides; Hydroxides of metals
    • C08K2003/2217—Oxides; Hydroxides of metals of magnesium
    • C08K2003/222—Magnesia, i.e. magnesium oxide
    • 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
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20—Oxides; Hydroxides
    • C08K3/22—Oxides; Hydroxides of metals
    • C08K2003/2227—Oxides; Hydroxides of metals of aluminium
    • 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
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20—Oxides; Hydroxides
    • C08K3/22—Oxides; Hydroxides of metals
    • C08K2003/2237—Oxides; Hydroxides of metals of titanium
    • C08K2003/2241—Titanium dioxide

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Laminated Bodies (AREA)
  • Optical Elements Other Than Lenses (AREA)
  • Paints Or Removers (AREA)

Abstract

The invention relates to a diffuse reflection coating and a diffuse reflection coating, the diffuse reflection coating comprises a first coating and a second coating matched with the first coating, wherein the first coating comprises a first resin and a first filler, the absolute value of the difference between the refractive index of the first resin and the refractive index of the first filler is greater than or equal to 1, the reflectivity of the first filler in a wave band of 0.4-2.5 mu m is greater than or equal to 92%, the second coating comprises a second resin and a second filler, and the reflectivity of the second filler in a wave band of 0.3-0.4 mu m is greater than or equal to 90%. When the thickness of the diffuse reflection coating prepared by using the reflective coating is less than or equal to 300 mu m, the diffuse reflection coating has excellent reflectivity to the sunlight of all bands, widens the application field of the diffuse reflection coating, and effectively reduces the raw material cost of the diffuse reflection coating.

Description

Diffuse reflection paint and diffuse reflection coating
Technical Field
The invention relates to the technical field of materials, in particular to a diffuse reflection coating and a diffuse reflection coating.
Background
However, barium sulfate is generally used as a functional filler in the conventional diffuse reflection coating, the diffuse reflection coating has excellent reflectivity only in a 0.4-1.1 μm band, the reflectivity in a 0.3-0.4-1.5 μm band is low, the diffuse reflection coating is difficult to be well applied to components such as an integrating sphere simulating the whole band of sunlight, and in order to enable the reflectivity of the diffuse reflection coating in a 0.4-1.1 μm band to reach 99%, the thickness of the diffuse reflection coating needs to reach more than 500 μm, so that the cost of raw materials of the diffuse reflection coating is high.
Disclosure of Invention
Based on the above, it is necessary to provide a diffuse reflection coating and a diffuse reflection coating, and a diffuse reflection coating made by using the diffuse reflection coating can achieve a reflectance of 95% or more in a 0.3 μm-2.5 μm band and a reflectance of 97% or more in a 0.3 μm-0.78 μm band when the thickness of the diffuse reflection coating is 300 μm or less, has an excellent reflectance, and effectively reduces the raw material cost of the diffuse reflection coating.
The invention provides a diffuse reflection coating, which comprises a first coating and a second coating matched with the first coating, wherein the first coating comprises a first resin and a first filler, the absolute value of the difference between the refractive index of the first resin and the refractive index of the first filler is greater than or equal to 1, the reflectivity of the first filler in a 0.4-2.5 mu m waveband is greater than or equal to 92%, the second coating comprises a second resin and a second filler, and the reflectivity of the second filler in a 0.3-0.4 mu m waveband is greater than or equal to 90%.
In one embodiment, the first filler has a refractive index of 2.35 to 3.0;
and/or the refractive index of the first resin is 1.35-2.0.
In one embodiment, the first filler is shaped like a burr, and includes a core and a shell covering an outer surface of the core.
In one embodiment, the shell layer is a single layer structure, a double layer structure, or a multi-layer structure.
In one embodiment, the material of the core comprises at least one of rutile titanium dioxide, anatase titanium dioxide, diamond, or zinc sulfide;
and/or the material of the shell layer comprises at least one of silicon oxide or aluminum oxide.
In one embodiment, the particle size of the core is 0.3 μm to 0.6 μm;
and/or the average thickness of the shell layer is 0.1-0.2 μm.
In one embodiment, the first filler has a mass of 50 to 250 parts by weight based on 100 parts by weight of the first resin.
In an embodiment, the second filler comprises at least one of barium sulfate, alumina, zinc sulfide, zirconia, calcium carbonate, rhodium oxide, or magnesium oxide.
In one embodiment, the second filler has a mass of 100 parts by weight to 300 parts by weight based on 100 parts by weight of the second resin.
In one embodiment, the first resin comprises at least one of a polyurethane resin, an acrylic resin, an epoxy resin, a polyester resin, or a silicone resin;
and/or the second resin comprises at least one of polyurethane resin, acrylic resin, epoxy resin, polyester resin or organic silicon resin.
The diffuse reflection coating prepared from the reflection coating comprises a first coating and a second coating which are sequentially stacked on the surface of an existing substrate, wherein the thickness of the first coating is 100-200 mu m, and the thickness of the second coating is 20-100 mu m.
In one embodiment, the total thickness of the diffuse reflective coating is less than or equal to 200 μm.
In the diffuse reflection coating of the invention, the absolute value of the difference between the refractive index of the first resin in the first coating and the refractive index of the first filler is more than or equal to 1, therefore, when the reflectivity of the first filler in a 0.4-2.5 μm waveband is more than or equal to 92%, the first coating formed by the first coating has excellent diffuse reflection capacity, the reflectivity in the 0.4-2.5 μm waveband reaches more than 91%, and the use of the second coating which has the reflectivity in the 0.3-O.4 μm waveband of more than or equal to 90% is matched, when the thickness of the diffuse reflection coating is less than or equal to 300 μm, the reflectivity in the 0.3-2.5 μm waveband can reach more than 95%, and the reflectivity in the 0.3-0.78 μm waveband can reach more than 97%, therefore, the first coating has excellent reflectivity for ultraviolet light, visible light and infrared light, the application field of the diffuse reflection coating is widened, the raw material cost of the diffuse reflection coating is effectively reduced, and the diffuse reflection coating can be better applied to display back plates, LED lamps, integrating spheres, external light source displays and other components.
Drawings
FIG. 1 is a schematic structural diagram of a diffuse reflective coating according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a first filler according to an embodiment of the present invention.
In the figure: 10. a first coating layer; 101. a first filler; 1011. a core; 1012. a shell layer; 20. a second coating layer; 201. a second filler.
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 diffuse reflection coating provided by the invention is mainly used for preparing diffuse reflection coatings, and ultraviolet light, visible light and infrared light in sunlight can be effectively reflected when the thickness of the diffuse reflection coating prepared by the diffuse reflection coating is less than or equal to 300 mu m.
The diffuse reflection coating provided by the invention comprises a first coating and a second coating matched with the first coating, wherein the first coating comprises a first resin and a first filler 101, the absolute value of the difference between the refractive index of the first resin and the refractive index of the first filler 101 is greater than or equal to 1, the reflectivity of the first filler 101 in a 0.4-2.5 mu m waveband is greater than or equal to 92%, the second coating comprises a second resin and a second filler 201, and the reflectivity of the second filler 201 in a 0.3-0.4 mu m waveband is greater than or equal to 90%.
The surface of the diffuse reflection coating formed by the diffuse reflection coating of the present invention is not flat, and therefore, the reflectance of the present invention refers to diffuse reflectance.
In the diffuse reflection coating of the present invention, the absolute value of the difference between the refractive index of the first resin in the first coating and the refractive index of the first filler 101 is greater than or equal to 1, and therefore, when the reflectance of the first filler 101 in the 0.4 μm-2.5 μm band is greater than or equal to 92%, the first coating 10 formed by the first coating has excellent diffuse reflection capability, and the reflectance in the 0.4 μm-2.5 μm band reaches 91% or more, so that the first coating 10 formed by the first coating has excellent scattering capability, and when the thickness of the first coating 10 is reduced to 200 μm or less, the reflectance in the 0.4 μm-2.5 μm band reaches 91% or more.
In order to enable the first coating 10 formed by the first coating to have higher reflectivity in a wave band of 0.4-2.5 μm, the thickness of the first coating 10 can be further reduced, and the raw material cost of the diffuse reflection coating can be further effectively reduced; preferably, the absolute value of the difference between the refractive index of the first resin and the refractive index of the first filler 101 is greater than or equal to 1.1, and at this time, the first coating material forms the first coating layer 10 having a reflectance of greater than or equal to 92.5% in the wavelength band of 0.4 μm to 2.5 μm; it is further preferable that the absolute value of the difference between the refractive index of the first resin and the refractive index of the first filler 101 is 1.2 or more, and at this time, the first coating material forms the first coating layer 10 having a reflectance of 93% or more in the 0.4 μm to 2.5 μm band.
It is understood that the present invention is not further limited with respect to the magnitude relationship between the refractive index of the first resin and the refractive index of the first filler 101, and in one embodiment, the refractive index of the first resin is smaller than the refractive index of the first filler 101, for example, the refractive index of the first resin is 1.35 to 2.0, the refractive index of the first filler 101 is 2.35 to 3.0; in another embodiment, the refractive index of the first resin is greater than the refractive index of the first filler 101, for example, the refractive index of the first resin is 1.35 to 2.0, and the refractive index of the first filler 101 is 0.35 to 1.0.
Considering that the refractive index of most conventional first resins is smaller than that of the first filler 101, in one embodiment, the refractive index of the first resin is 1.35 to 2.0 and the refractive index of the first filler 101 is 2.35 to 3.0.
It is understood that the shape of the first filler 101 of the present invention may be any one of a burr-like shape, a rod-like shape, a spherical shape, an ellipsoidal shape, or an irregular shape, and when the shape of the first filler 101 is a burr-like shape, it is advantageous to improve the reflectance of the first coating layer 10 in the wavelength band of 0.4 μm to 2.5 μm, and the shape of the first filler 101 is preferably a burr-like shape.
As shown in fig. 2, which is a schematic structural diagram of a first filler 101 according to an embodiment of the present invention, the first filler 101 includes a core 1011 and a shell 1012 covering an outer surface of the core 1011.
It is understood that the shell layer 1012 may have a single-layer structure, a double-layer structure, or a multi-layer structure, in which the shell layer 1012 has a double-layer structure, in which case, the inner layer of the double-layer structure can improve the weather resistance of the first filler 101, and the outer layer has a burr shape, which can further improve the reflectivity of the first filler 101.
In order to make the first filler 101 have higher reflectivity in the wavelength band of 0.4 μm to 2.5 μm, the first filler is designed as a core-shell, in an embodiment, the material of the core 1011 includes at least one of rutile type titanium dioxide, anatase type titanium dioxide, diamond or zinc sulfide, and in order to further increase the absolute value of the difference of the refractive indexes of the first resin and the first filler 101, it is preferable that the material of the core 1011 includes rutile type titanium dioxide, and the particle size of the core 1011 is 0.3 μm to 0.6 μm.
In order to further improve the reflectivity of the first filler 101 in the wavelength band of 0.4 μm to 2.5 μm, in one embodiment, the material of the shell 1012 includes at least one of silica or alumina, and the average thickness of the shell 1012 is 0.1 μm to 0.2 μm.
In order to ensure the reflection effect of the first filler 101 in the wavelength band of 0.4 μm to 2.5 μm and further ensure the reflectivity of the first coating layer 10 formed by the first coating material in the wavelength band of 0.4 μm to 2.5 μm, it is preferable that the color of the first filler 101 is white.
In one embodiment, the mass of the first filler 101 is 50 to 250 parts by weight, and more preferably 100 to 200 parts by weight, based on 100 parts by weight of the first resin.
In one embodiment, the first resin includes at least one of a polyurethane resin, an acrylic resin, an epoxy resin, a polyester resin, or a silicone resin, it being understood that the first resin may be a water-based resin, a solventless resin, or a solvent-based resin.
In one embodiment, the first coating further comprises a first auxiliary agent, and the mass of the first auxiliary agent is less than or equal to 20 parts by weight based on 100 parts by weight of the first resin.
In one embodiment, the first auxiliary agent comprises at least one of a film forming aid, a dispersant, a thickener, or a defoamer.
When the first adjuvant comprises a film-forming adjuvant, the film-forming adjuvant is capable of enhancing the film-forming properties of the first coating and improving the leveling, sag resistance of the first coating, and 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, diethylene glycol methyl ether or propylene glycol or benzyl alcohol, and the mass of the film-forming adjuvant is less than or equal to 5 parts by weight based on 100 parts by weight of the first resin.
When the first aid 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 5 parts by weight based on 100 parts by weight of the first resin.
When the first auxiliary agent comprises the thickening agent, the thickening agent can adjust the viscosity of the first coating, so that the first coating is prevented from being cooled during construction, the sagging phenomenon of the first coating is caused, the good leveling property during construction is ensured, a smooth first coating is formed, the first coating can be endowed with excellent storage stability, in one embodiment, the thickening agent comprises at least one of association type polyurethane thickening agent, association type alkali swelling thickening agent, hydroxyethyl cellulose ether, water-based bentonite, bentonite or polyacrylate, and the mass of the thickening agent is less than or equal to 5 parts by weight based on 100 parts by weight of the first resin.
In the production process of the first coating, a large amount of stable bubbles are not beneficial to smooth production and coating effect and performance of the first coating during coating, and a defoaming agent can be added for defoaming. When the first 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 a silicone-based antifoaming agent, a polyether-based antifoaming agent, or a fatty alcohol-based antifoaming agent, and 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 5 parts by weight or less based on 100 parts by weight of the first resin.
It can be understood that when the reflectance of the second filler 201 in the 0.3 μm-0.4 μm band is greater than or equal to 90%, the reflectance of the second coating 20 formed by the second paint in the 0.3 μm-0.4 μm band is greater than or equal to 90%, when the first paint of the present invention is used in combination with the second paint, the reflectance in the 0.3 μm-2.5 μm band can reach more than 95%, and the reflectance of the light in the 0.3 μm-0.78 μm band reaches more than 97%, which has excellent reflectance for ultraviolet light, visible light and infrared light, and widens the application field of the diffuse reflection paint, and the diffuse reflection coating is not easy to generate yellowing, aging, etc., and prolongs the service life.
In an embodiment, the second filler 201 includes at least one of barium sulfate, alumina, zinc sulfide, zirconia, calcium carbonate, rhodium oxide, or magnesium oxide. In order to make the second coating layer 20 have better reflectivity for light in the 0.3 μm-0.4 μm waveband, preferably, the reflectivity of the second filler 201 in the 0.3 μm-0.4 μm waveband is greater than or equal to 93%, and specifically, the second filler 201 preferably comprises at least one of alumina, zirconia, barium sulfate and calcium carbonate; the mass of the second filler 201 is 100 parts by weight to 300 parts by weight, more preferably 150 parts by weight to 250 parts by weight, based on 100 parts by weight of the second resin.
In order to make the second filler 201 have a higher reflectivity in the wavelength band of 0.3 μm to 0.4 μm, in one embodiment, the particle size of the second filler 201 is 0.3 μm to 1.0 μm, and more preferably 0.4 μm to 0.8 μm.
In one embodiment, the second resin includes at least one of a polyurethane resin, an acrylic resin, an epoxy resin, a polyester resin, or a silicone resin.
In one embodiment, the second coating material further comprises a second auxiliary agent, and the mass of the second auxiliary agent is less than or equal to 20 parts by weight based on 100 parts by weight of the second resin.
In one embodiment, the second adjuvant comprises at least one of a film-forming adjuvant, a dispersant, a thickener, or a defoamer.
When the second adjuvant comprises a film-forming adjuvant, the film-forming adjuvant is capable of enhancing the film-forming properties of the first coating and improving the leveling, sag resistance of the first coating, and 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, diethylene glycol methyl ether or propylene glycol or benzyl alcohol, and the mass of the film-forming adjuvant is less than or equal to 5 parts by weight based on 100 parts by weight of the first resin.
When the second auxiliary agent includes a dispersant, the dispersant can improve the compatibility of the second resin with the second 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 5 parts by weight based on 100 parts by weight of the second resin.
When the second additive comprises the thickening agent, the thickening agent can adjust the viscosity of the second coating, so that the second coating is prevented from being cooled during construction, the sagging phenomenon of the second coating is caused, the good leveling property during construction is ensured, a flat second coating is formed, the second coating can be endowed with excellent storage stability, in one embodiment, the thickening agent comprises at least one of association polyurethane thickening agent, association alkali swelling thickening agent, hydroxyethyl cellulose ether, water-based bentonite, bentonite or polyacrylate, and the mass of the thickening agent is less than or equal to 5 parts by weight based on 100 parts by weight of the second resin.
In the production process of the second coating, a large amount of stable bubbles are not beneficial to smooth production and coating effect and performance during coating of the second coating, and a defoaming agent can be added for defoaming. When the second 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 a silicone-based antifoaming agent, a polyether-based antifoaming agent, or a fatty alcohol-based antifoaming agent, and 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 5 parts by weight or less based on 100 parts by weight of the second resin.
The invention also provides an application method of the diffuse reflection coating, which comprises the following steps:
forming a first coating on the surface of an existing substrate, and drying to form a first coating 10; and
and forming a second coating on the surface of the first coating 10, and drying to form a second coating 20 to obtain the diffuse reflection coating.
It should be noted that, when the diffuse reflection coating is applied, if the positions of the first coating 10 and the second coating 20 in the diffuse reflection coating are exchanged, and the surface of the first coating 10 away from the second coating 20 is the light incident side, since the reflectivity of the first coating 10 for the wavelength band of 0.3 μm to 0.4 μm is low, the first coating 10 is liable to absorb the light in the wavelength band of 0.3 μm to 0.4 μm, and further the diffuse reflection coating is liable to absorb the light in the wavelength band of 0.3 μm to 0.4 μm, the reflectivity in the wavelength band of 0.3 μm to 2.5 μm is less than 95%, and the reflectivity in the wavelength band of 0.3 μm to 0.78 μm is less than 97%. Therefore, when the diffuse reflection coating of the present invention is applied, the first paint is formed on the surface of the existing substrate, and then the second paint is formed on the surface of the first coating 10, and the surface of the second coating 20 away from the first coating 10 is the light incident side.
Alternatively, the first coating material may be formed on the surface of the existing substrate by brushing, rolling, spraying, etc., and the second coating material may be formed on the surface of the first coating layer 10 by brushing, rolling, spraying, etc.
As shown in fig. 1, the diffuse reflection coating of an embodiment of the diffuse reflection coating comprises a first coating 10 and a second coating 20 which are sequentially laminated on the surface of an existing substrate, wherein the first coating 10 has a thickness of 100 μm to 200 μm, and the second coating 20 has a thickness of 20 μm to 100 μm.
It is understood that the base material of the first coating layer 10 is a first resin, the first filler 101 is further distributed in the first coating layer 10, the base material of the second coating layer 20 is a second resin, and the second filler 201 is further distributed in the second coating layer 20.
In one embodiment, in order to better reduce the production cost of the cooling coating, the total thickness of the diffuse reflection coating is less than or equal to 200 μm, wherein the thickness of the first coating 10 is 120 μm to 180 μm, and the thickness of the second coating 20 is 20 μm to 80 μm.
In one embodiment, the diffuse reflection coating further comprises a protective layer, and the protective layer is stacked on the surface of the second coating 20 away from the first coating 10 to provide surface protection, prevent the reflection effect of the diffuse reflection coating from being reduced due to surface contamination, and simultaneously improve the weather resistance of the diffuse reflection coating.
In one embodiment, the material of the protective layer includes one or more of polyacrylic resin, polyurethane resin, fluorocarbon resin, and silicone resin.
Specifically, the existing substrate includes metal, plastic, rubber, concrete, cement, asphalt, paper, textile, wood, tile, glass, or organic synthetic materials.
When the thickness of the diffuse reflection coating prepared by the diffuse reflection coating is reduced to be less than 300 mu m, the reflectivity of the diffuse reflection coating in a wave band of 0.3-2.5 mu m can reach more than 95 percent, and the reflectivity in a wave band of 0.3-0.78 mu m can reach more than 97 percent, so that the cost of raw materials of the diffuse reflection coating is effectively reduced, and the diffuse reflection coating can be better applied to components such as display backplanes, LED lamps, integrating spheres, external light source displays and the like.
The present invention will be described in further detail with reference to specific examples and comparative examples.
Example 1
The diffuse reflective coating of embodiment 1, comprising a first coating and a second coating in combination with the first coating.
Wherein the first coating comprises a first resin: 100 parts by weight of an acrylic resin, 100 parts by weight of a first filler 101, a film-forming aid: 4.2 parts by weight of propylene glycol butyl ether, dispersant: 3.1 parts by weight of polyacrylate, thickener: 3.5 parts by weight of hydroxyethyl cellulose ether, defoamer: 1.2 parts by weight of a silicone defoaming agent; wherein the first filler 101 is in a burr shape, the core 1011 of the first filler 101 is made of rutile titanium dioxide, the core 1011 has a particle size of 0.4-0.6 μm, the shell 1012 is made of alumina and has a double-layer structure with an average thickness of 0.1-0.2 μm, the refractive index of the first filler 101 is 2.7, the refractive index of the first resin is 1.5, the absolute value of the difference between the refractive index of the first resin and the refractive index of the first filler 101 is 1.2, and the reflectance of the first filler 101 in a wavelength band of 0.4-2.5 μm is 95%.
The second coating includes a second resin: 100 parts by weight of an acrylic resin, second filler 201: 200 parts by weight of alumina with a particle size of 0.5-0.7 μm, a film-forming aid: 3.5 parts by weight of propylene glycol butyl ether, dispersant: 2.4 parts by weight of polyacrylate, thickener: 2.2 parts by weight of hydroxyethyl cellulose ether, defoamer: 1.0 part by weight of a silicone-based defoaming agent, wherein the reflectance of the second filler 201 in the 0.3 μm to 0.4 μm band is 95%.
Forming a first coating on the surface of an existing substrate, and drying to form a first coating 10, wherein the thickness of the first coating 10 is 150 microns; and forming a second coating on the surface of the first coating 10 far away from the existing substrate, and drying to form a second coating 20, wherein the thickness of the second coating 20 is 50 mu m to obtain the diffuse reflection coating.
Example 2
Example 2 the embodiment of example 1 was referenced, except that the material of the core 1011 of the first filler 101 was anatase type titanium dioxide, the refractive index of the first filler 101 was 2.6, the absolute value of the difference between the refractive index of the first resin and the refractive index of the first filler 101 was 1.1, and the reflectance of the first filler 101 in the 0.4 μm-2.5 μm band was 92%.
Example 3
Example 3 the embodiment of example 1 was referred to, except that the material of shell layer 1012 of first filler 101 was silica, the refractive index of first filler 101 was 2.5, the absolute value of the difference between the refractive index of the first resin and the refractive index of first filler 101 was 1.0, and the reflectance of first filler 101 in the 0.4 μm to 2.5 μm band was 93%.
Example 4
Example 4 the embodiment of example 1 was referenced, except that the shape of the first filler 101 was spherical, the material of the first filler 101 was rutile type titanium dioxide, the refractive index of the first filler 101 was 2.68, the absolute value of the difference between the refractive index of the first resin and the refractive index of the first filler 101 was 1.18, and the reflectance of the first filler 101 in the 0.4 μm to 2.5 μm band was 92%.
Example 5
Example 5 the embodiment of example 1 was referred to, except that the first resin was a urethane resin, the refractive index of the first resin was 1.6, and the absolute value of the difference between the refractive index of the first resin and the refractive index of first filler 101 was 1.1.
Example 6
Example 6 the embodiment of example 1 was referenced except that the first filler 101 was used in an amount of 50 parts by weight.
Example 7
Example 7 the embodiment of example 1 was referenced except that the first filler 101 was used in an amount of 150 parts by weight.
Example 8
Example 8 the embodiment of example 1 was referenced, except that the second resin was an epoxy resin, the second filler 201 was magnesium oxide, and the amount of the second filler 201 was 100 parts by weight.
Example 9
Example 9 the embodiment of example 1 was referenced, except that the thickness of the first coating layer 10 was 120 μm and the thickness of the second coating layer 20 was 40 μm.
Comparative example 1
Comparative example 1 the embodiment of example 1 was referenced, except that the first resin was replaced with a fluorine-containing resin having a refractive index of 1.4, the first filler was replaced with zinc sulfide having a refractive index of 2.3, and the absolute value of the difference between the refractive index of the first resin and the refractive index of the first filler was 0.9.
Comparative example 2
Comparative example 2 the embodiment of example 1 was referred to except that the second coating material was first formed on the surface of the existing substrate, dried to form the second coating layer 20, the first coating material was formed on the surface of the second coating layer 20 remote from the existing substrate, and dried to form the first coating layer 10, to obtain the diffuse reflection coating layer.
Comparative example 3
Comparative example 3 the embodiment of example 1 was referenced, except that the second filler was silica, and the second filler had a reflectance of 85.2% in the 0.3 μm to 0.4 μm band.
Comparative example 4
Comparative example 4 the embodiment of example 1 was referenced, except that the thickness of the first coating layer was 50 μm.
Comparative example 5
Comparative example 5 provides a diffuse reflection coating, wherein the diffuse reflection coating comprises a first resin: 100 parts by weight of a silicone resin, a first filler: 100 parts by weight of barium sulfate with the particle size of 0.5-0.7 mu m, a film-forming aid: 4.2 parts by weight of propylene glycol butyl ether, dispersant: 3.1 parts by weight of polyacrylate, thickener: 3.5 parts by weight of hydroxyethyl cellulose ether, defoamer: 1.2 parts by weight of a silicone defoaming agent.
And forming the diffuse reflection coating on the surface of the existing substrate, and drying to form the diffuse reflection coating.
Comparative example 6
Comparative example 6 the embodiment of example 1 was referenced except that the diffuse reflection coating material includes only the first coating material, and the first coating material was formed on the surface of the existing substrate and dried to form the first coating layer 10.
Test example
The optical properties of the first coating, the second coating, and the diffuse reflection coating of examples 1-9 and comparative examples 1-6 above were tested, with the test criteria shown below, and the test results shown in table 1.
Reflectance in the 0.3 μm-0.4 μm band: the reflectance in the 0.3 μm-0.4 μm band was measured as specified in JG/T235-2014 at 6.4.
Reflectance in the 0.3 μm-0.78 μm band: the reflectance in the 0.3 μm-0.78 μm band was taken with reference to the specification of 6.4 in JG/T235-2014.
Reflectance in the 0.4 μm-2.5 μm band: the reflectance in the 0.4 μm-2.5 μm band was measured as specified in JG/T235-2014 at 6.4.
Reflectance in the 0.3 μm-2.5 μm band: the method is carried out according to the specification of 6.4 in JG/T235-2014.
TABLE 1
Figure BDA0003329676020000141
Figure BDA0003329676020000151
In comparative example 2, the reflectance of the first coating layer in the 0.3 μm to 0.4 μm band was 20.1%, and the reflectance of the second coating layer in the 0.4 μm to 2.5 μm band was 91.1%.
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 are only illustrative of several embodiments of the present invention, and the description is specific and detailed, but it should not be understood that the invention is not limited to the claims, and those skilled in the art can make various changes and modifications without departing from the spirit of the invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (12)

1. A diffuse reflection paint, characterized by comprising a first paint and a second paint used in cooperation with the first paint, wherein the first paint comprises a first resin and a first filler, the absolute value of the difference between the refractive index of the first resin and the refractive index of the first filler is greater than or equal to 1, the reflectance of the first filler in a 0.4 μm-2.5 μm band is greater than or equal to 92%, and the second paint comprises a second resin and a second filler, and the reflectance of the second filler in a 0.3 μm-0.4 μm band is greater than or equal to 90%.
2. The diffuse reflective coating of claim 1, wherein said first filler has a refractive index of 2.35-3.0;
and/or the refractive index of the first resin is 1.35-2.0.
3. The diffuse reflection coating of claim 1, wherein the first filler is shaped as a burr, and the first filler comprises a core and a shell layer covering an outer surface of the core.
4. The diffuse reflective coating of claim 3, wherein said shell layer is a single layer structure, a double layer structure or a multi-layer structure.
5. The diffuse reflective coating of claim 3, wherein the material of said core comprises at least one of rutile titanium dioxide, anatase titanium dioxide, diamond, or zinc sulfide;
and/or the material of the shell layer comprises at least one of silicon oxide or aluminum oxide.
6. The diffuse reflective coating of claim 3, wherein said core has a particle size of 0.3 μm to 0.6 μm;
and/or the average thickness of the shell layer is 0.1-0.2 μm.
7. The diffuse reflection coating according to claim 1, wherein the mass of said first filler is 50 parts by weight to 250 parts by weight based on 100 parts by weight of said first resin.
8. The diffuse reflective coating of any one of claims 1-7, wherein said second filler comprises at least one of barium sulfate, aluminum oxide, zinc sulfide, zirconium oxide, calcium carbonate, rhodium oxide, or magnesium oxide.
9. The diffuse reflection coating according to claim 8, wherein the mass of said second filler is 100 parts by weight to 300 parts by weight based on 100 parts by weight of said second resin.
10. The diffuse reflective coating of any one of claims 1-7, wherein said first resin comprises at least one of a polyurethane resin, an acrylic resin, an epoxy resin, a polyester resin, or a silicone resin;
and/or the second resin comprises at least one of polyurethane resin, acrylic resin, epoxy resin, polyester resin or organic silicon resin.
11. A diffuse reflection coating prepared from the reflective coating according to any one of claims 1 to 10, comprising a first coating layer and a second coating layer sequentially stacked on an existing substrate surface, wherein the first coating layer has a thickness of 100 μm to 200 μm, and the second coating layer has a thickness of 20 μm to 100 μm.
12. The diffuse reflective coating of claim 11, wherein the total thickness of the diffuse reflective coating is less than or equal to 200 μ ι η.
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CN1134555A (en) * 1994-12-27 1996-10-30 Ppg工业公司 Multilayer antireflective coating with graded base layer
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