CN108546458B - Composite coating with photothermal conversion capability capable of changing along with environmental temperature and preparation method thereof - Google Patents
Composite coating with photothermal conversion capability capable of changing along with environmental temperature and preparation method thereof Download PDFInfo
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- CN108546458B CN108546458B CN201810475858.1A CN201810475858A CN108546458B CN 108546458 B CN108546458 B CN 108546458B CN 201810475858 A CN201810475858 A CN 201810475858A CN 108546458 B CN108546458 B CN 108546458B
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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
- C09D121/00—Coating compositions based on unspecified rubbers
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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
- C09D5/004—Reflecting paints; Signal paints
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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
- 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
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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
- C08K2003/0856—Iron
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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
- C08K2003/0887—Tungsten
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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
- C08K2003/0893—Zinc
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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
- C08K3/18—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
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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
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2248—Oxides; Hydroxides of metals of copper
Abstract
A composite coating with photo-thermal conversion capability changing along with environmental temperature and a preparation method thereof belong to the technical field of building coating preparation. The composite coating consists of a bottom coating and a surface coating; the raw material of the bottom coating contains high-emissivity/high-thermal-expansion-rate powder, and the raw material of the surface coating contains low-emissivity/low-thermal-expansion-rate powder. The method comprises the following steps: preparing two equal parts of coating colloid, wherein one part is added with high emissivity/high thermal expansion rate powder, the other part is added with low emissivity/low thermal expansion rate powder, and water is respectively added to prepare two coatings; uniformly coating a bottom coating on the wall to form a bottom coating, and coating a surface coating after the bottom coating is formed into a film to form a surface coating. The powder adopted by the invention is cheap and easily available, and can be formed by only mixing raw materials in a proper proportion and then brushing and spraying, namely the purpose of energy conservation can be realized by technical combination in a certain form.
Description
Technical Field
The invention belongs to the technical field of building coating preparation, and particularly relates to a composite coating with photo-thermal conversion capability capable of changing along with environmental temperature and a preparation method thereof.
Background
Studies have shown that the use of heat reflective coatings can reduce the temperature within a building by about 9 ℃. In winter, the heat reflective coating for the building interior wall or the glass curtain wall can keep the heat of the building in the building body, thereby playing a role in keeping warm, and therefore the heat reflective coating becomes one of the hot spots of the recent energy-saving technical research. Among them, the pigment and filler are the key factors for determining the heat reflection performance, the heat radiation performance and the heat barrier property of the heat reflection coating. Most of the research on heat reflective coatings has focused on the research on pigments and fillers. The heat-insulating filler with excellent near-infrared reflection is prepared by combining titanium dioxide and hollow glass beads, such as Guoqingquan, Marsdenia tenacissima and the like, and has a reflectance of 86% for visible light and a reflectance of 81% for near-infrared light.
Paul Berdahl proposes that water vapor and CO in the atmosphere are in a wavelength range of 8 to 13 μm from the viewpoint of heat radiation2And O3The absorption capacity of the radiator is very weak, the wave band is generally called as an atmospheric window, and the radiator on the ground can directly see the space through the atmospheric window, so that a certain degree of cooling effect is obtained. Guo Bao Min and so on propose to produce coating with high reflectance in 0.4-2.5 μm (main heat source) and high radiance in 8-13 μm, and can obtain ideal radiation cooling effect.
Although the traditional radiation energy-saving coating can play a role in heat preservation or cooling, the building wall cannot dynamically adapt to the change of the external thermal environment, and the traditional radiation energy-saving coating can block indoor heat from being dissipated outwards in summer or block solar radiation from heating a house in winter. I.e. problems of summer overheating or winter supercooling can occur. The existing wall energy-saving coating is a reflective heat-insulating coating, which realizes certain energy saving by blocking heat flow, but ignores the influence of climatic environment and cannot adapt to large temperature difference span in winter and summer in severe cold areas. The reflective coating can prevent solar radiation from heating the wall in winter, and indirectly increases heating energy consumption.
Disclosure of Invention
The invention aims to solve the problem that the existing coating can not dynamically adapt to the change of the external thermal environment, and provides a composite coating with the photothermal conversion capability changing along with the change of the environmental temperature and a preparation method thereof, wherein the composite coating is a thermal control coating with variable emissivity, the coating containing high emissivity/high thermal expansion rate powder is used as a bottom layer, the coating containing low emissivity/low thermal expansion rate powder is superposed on a surface layer, and when the air temperature is low, the low emissivity/low thermal expansion rate powder covers the high emissivity/high thermal expansion rate powder, so that the emissivity of a wall body is reduced; when the temperature is high, the high emissivity/high thermal expansion rate powder body expands, the ratio of the high emissivity/high thermal expansion rate powder body on the surface of the coating is increased, the high emissivity in summer and the low emissivity in winter are realized, and the heat dissipation capacity of the wall surface is automatically regulated and controlled.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the composite coating with the photo-thermal conversion capability capable of changing along with the ambient temperature comprises a bottom coating and a surface coating;
the raw material of the bottom coating contains high-emissivity/high-thermal-expansion-rate powder, and the raw material of the surface coating contains low-emissivity/low-thermal-expansion-rate powder.
A preparation method of the composite coating with the photothermal conversion capability capable of changing along with the ambient temperature comprises the following specific steps:
the method comprises the following steps: preparing two equal parts of coating colloid which are divided into a coating colloid A and a coating colloid B; adding high-emissivity/high-thermal-expansion-rate powder into the coating colloid A, and adding water to prepare a bottom coating, wherein the coating colloid A: high emissivity/high thermal expansion rate powder: the mass ratio of water = 50-80: 10-20: 15-25; adding low-emissivity/low-thermal-expansion-rate powder into the coating colloid B, and adding water to prepare a surface coating, wherein the coating colloid B: low emissivity/low thermal expansion powder: the mass ratio of water = 50-80: 10-20: 15-25, preparing two coatings;
step two: uniformly coating a bottom layer coating containing high-emissivity/high-thermal-expansion-rate powder on a wall to form a bottom layer coating, and after the bottom layer coating is formed into a film, coating a surface layer coating containing low-emissivity/low-thermal-expansion-rate powder to form a surface layer coating.
Compared with the prior art, the invention has the beneficial effects that:
(1) the emissivity-variable thermal control coating can automatically adjust the powder ratio of high emissivity/high thermal expansion rate on the surface of the coating along with the ambient temperature so as to realize the automatic change of the overall emissivity of the coating.
(2) The intelligent wall surface heat regulation system can realize intelligent regulation and control of wall surface heat in winter and summer. When the outdoor temperature is higher in summer, the inner layer powder expands under heating, the high emissivity/high thermal expansion rate powder is exposed, and the overall emissivity is improved. When the outdoor temperature is lower, the high emissivity/high thermal expansion rate powder shrinks, and the low emissivity/low thermal expansion rate powder covers the surface, so that the overall emissivity is reduced. Experiments show that when the temperature approaches the freezing point, the emissivity of the coating is only about 0.2, and when the temperature is increased to 40 ℃, the emissivity of the coating can be increased to 0.8. Through measurement and calculation, the temperature in the wall can be reduced by 3.6 ℃ in summer, the temperature in the wall can be increased by 4.3 ℃ in winter, and the air-conditioning cost is saved by 20-70%.
(3) The preparation method is convenient and fast, complex equipment is not needed, the adopted powder (rubber and aluminum oxide) is cheap and easily available, and the powder can be formed by only mixing raw materials in a proper proportion and then brushing and spraying, namely, the purpose of saving energy can be realized through technical combination in a certain form.
Drawings
FIG. 1 is a schematic view of the microstructure of a variable emissivity thermal control coating, such as alumina and rubber powder;
FIG. 2 is a graph of composite coating emissivity versus temperature.
Detailed Description
The technical solution of the present invention is further described below with reference to the accompanying drawings, but not limited thereto, and modifications or equivalent substitutions may be made to the technical solution of the present invention without departing from the spirit of the technical solution of the present invention, and are intended to be covered by the scope of the present invention.
The first embodiment is as follows: the embodiment describes a composite coating with the photothermal conversion capability capable of changing along with the ambient temperature, wherein the composite coating consists of a bottom coating and a surface coating;
the raw material of the bottom coating contains high-emissivity/high-thermal-expansion-rate powder, and the raw material of the surface coating contains low-emissivity/low-thermal-expansion-rate powder.
The second embodiment is as follows: the composite coating with the photothermal conversion capability capable of changing along with the ambient temperature is prepared by the following steps of (1) preparing a composite coating with the photothermal conversion capability, wherein the high-emissivity/high-thermal-expansion-rate powder is hard rubber powder, cuprous oxide or lead boron glass, and the particle size is 100-5000 microns; the low-emissivity/low-thermal expansion rate powder is aluminum oxide, tungsten wire, iron powder, tin or zinc, and the particle size is 0.15-70 mu m.
The third concrete implementation mode: in the composite coating with photothermal conversion capability varying with ambient temperature according to the second embodiment, the particle size of the low-emissivity/low-thermal expansion rate powder is 40-60 μm, and the particle size effect in this range is good.
The fourth concrete implementation mode: a method for preparing a composite coating with a photothermal conversion capability varying with an ambient temperature according to any one of the first to third embodiments, the method comprising the following steps:
the method comprises the following steps: preparing two equal parts of coating colloid which are divided into a coating colloid A and a coating colloid B; adding high-emissivity/high-thermal-expansion-rate powder into the coating colloid A, and adding water to prepare a bottom coating, wherein the coating colloid A: high emissivity/high thermal expansion rate powder: the mass ratio of water = 50-80: 10-20: 15-25; adding low-emissivity/low-thermal-expansion-rate powder into the coating colloid B, and adding water to prepare a surface coating, wherein the coating colloid B: low emissivity/low thermal expansion powder: the mass ratio of water = 50-80: 10-20: 15-25, using a proper amount of film forming, defoaming, dispersing, thickening and other auxiliaries according to the condition of preparing the coating, thus preparing two coatings; when the auxiliary agents are added, the addition amount of each auxiliary agent is as follows (in mass percent): 0.2-0.8% of film-forming agent, 0.3-0.6% of dispersing agent, 0.4-2.5% of thickening agent and 0.2-0.5% of defoaming agent; the coating colloid can be any emulsion on the market (such as styrene-acrylic emulsion, polyvinyl acetate emulsion and butylbenzene emulsion); cleaning the wall body base surface, and confirming that the base surface is firm, free of falling, loosening, clean, dry and free of oil stains, such as base surface damage, cracks and the like, and needs to be repaired firstly;
step two: uniformly coating a bottom layer coating containing high-emissivity/high-thermal-expansion-rate powder on a wall to form a bottom layer coating, and after the bottom layer coating is formed into a film, coating a surface layer coating containing low-emissivity/low-thermal-expansion-rate powder to form a surface layer coating.
The fifth concrete implementation mode: the method for preparing a composite coating layer with a photothermal conversion capability varying with ambient temperature according to the fourth embodiment includes, in the first step, a coating colloid a: high emissivity/high thermal expansion rate powder: the mass ratio of water =3:1: 1; coating colloid B: low emissivity/low thermal expansion powder: the mass ratio of water =3:1: 1.
The powder with high emissivity/high thermal expansion rate and the powder with low emissivity/low thermal expansion rate in the invention are shown in the "/" in the relation of sum.
Fig. 1 is a schematic view of a microstructure of alumina and hard rubber powder as an example, and it can be clearly seen that when the external environment temperature is low, the low emissivity/low thermal expansion coefficient powder covers the high emissivity/high thermal expansion coefficient powder at the bottom layer, and when the external temperature rises, the high emissivity/high thermal expansion coefficient powder gradually expands due to heating, so that the surface area ratio of the powder on the surface is increased, and the overall emissivity of the composite coating is improved. The test shows that the emissivity of the composite coating changes with the ambient temperature as shown in fig. 2, the powder with high emissivity/high thermal expansion rate used in the test is hard rubber powder, the powder with low emissivity/low thermal expansion rate is alumina, when the ambient temperature rises from 3 ℃ to 44 ℃, the emissivity of the composite coating rises from the lowest 0.14 to 0.8, the emissivity of the composite coating changes obviously with the ambient temperature, and the effect is obvious.
Claims (4)
1. The composite coating with the photothermal conversion capability capable of changing along with the ambient temperature is characterized in that: the composite coating consists of a bottom coating and a surface coating;
the raw material of the bottom coating contains high-emissivity/high-thermal-expansion-rate powder, and the raw material of the surface coating contains low-emissivity/low-thermal-expansion-rate powder; the high-emissivity/high-thermal-expansion-rate powder is hard rubber powder, cuprous oxide or lead boron glass, and the particle size is 100-5000 microns; the low-emissivity/low-thermal expansion rate powder is aluminum oxide, tungsten wire, iron powder, tin or zinc, and the particle size is 0.15 nm-70 mu m.
2. The composite coating layer of claim 1, wherein the photothermal conversion capability is variable with ambient temperature, and wherein: the particle size of the low-emissivity/low-thermal expansion rate powder is 40-60 mu m.
3. A method for preparing a composite coating layer with a photothermal conversion capability varying with an ambient temperature according to claim 1 or 2, characterized in that: the method comprises the following specific steps:
the method comprises the following steps: preparing two equal parts of coating colloid which are divided into a coating colloid A and a coating colloid B; adding high-emissivity/high-thermal-expansion-rate powder into the coating colloid A, and adding water to prepare a bottom coating, wherein the coating colloid A: high emissivity/high thermal expansion rate powder: the mass ratio of water = 50-80: 10-20: 15-25; adding low-emissivity/low-thermal-expansion-rate powder into the coating colloid B, and adding water to prepare a surface coating, wherein the coating colloid B: low emissivity/low thermal expansion powder: the mass ratio of water = 50-80: 10-20: 15-25, preparing two coatings;
step two: uniformly coating a bottom layer coating containing high-emissivity/high-thermal-expansion-rate powder on a wall to form a bottom layer coating, and after the bottom layer coating is formed into a film, coating a surface layer coating containing low-emissivity/low-thermal-expansion-rate powder to form a surface layer coating.
4. The method for preparing a composite coating having a photothermal conversion capability variable with an ambient temperature according to claim 3, wherein: in the first step, coating colloid A: high emissivity/high thermal expansion rate powder: the mass ratio of water =3:1: 1; coating colloid B: low emissivity/low thermal expansion powder: the mass ratio of water =3:1: 1.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810475858.1A CN108546458B (en) | 2018-05-17 | 2018-05-17 | Composite coating with photothermal conversion capability capable of changing along with environmental temperature and preparation method thereof |
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| CN201810475858.1A CN108546458B (en) | 2018-05-17 | 2018-05-17 | Composite coating with photothermal conversion capability capable of changing along with environmental temperature and preparation method thereof |
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| CN108546458B true CN108546458B (en) | 2020-06-12 |
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| JP2002314013A (en) * | 2001-04-13 | 2002-10-25 | Hitachi Cable Ltd | Heat dissipating material and method for manufacturing the same |
| CN1396219A (en) * | 2002-08-29 | 2003-02-12 | 中国科学院理化技术研究所 | Themally insulating and reducing composite paint and its preparing process and application |
| CN101481583A (en) * | 2008-01-08 | 2009-07-15 | 北京航空航天大学 | Aqueous contamination resistant heat reflection phase change insulating paint and its preparing process |
| CN204345956U (en) * | 2014-11-14 | 2015-05-20 | 中国建筑材料科学研究总院 | The continuously adjustable coating for selective absorption of sunlight spectrum of a kind of ABSORPTION EDGE |
| CN106675391A (en) * | 2015-11-11 | 2017-05-17 | 北京卫星环境工程研究所 | Radiation-proof thermal control coating and manufacturing method thereof |
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2018
- 2018-05-17 CN CN201810475858.1A patent/CN108546458B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1051446A (en) * | 1989-09-28 | 1991-05-15 | 坦迪公司 | But signal maintenance/reflection horizon record/can wipe the light medium |
| JP2002314013A (en) * | 2001-04-13 | 2002-10-25 | Hitachi Cable Ltd | Heat dissipating material and method for manufacturing the same |
| CN1396219A (en) * | 2002-08-29 | 2003-02-12 | 中国科学院理化技术研究所 | Themally insulating and reducing composite paint and its preparing process and application |
| CN101481583A (en) * | 2008-01-08 | 2009-07-15 | 北京航空航天大学 | Aqueous contamination resistant heat reflection phase change insulating paint and its preparing process |
| CN204345956U (en) * | 2014-11-14 | 2015-05-20 | 中国建筑材料科学研究总院 | The continuously adjustable coating for selective absorption of sunlight spectrum of a kind of ABSORPTION EDGE |
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