CN114605875A - Double-layer organic-inorganic composite building energy-saving coating material and preparation method thereof - Google Patents

Double-layer organic-inorganic composite building energy-saving coating material and preparation method thereof Download PDF

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CN114605875A
CN114605875A CN202210322802.9A CN202210322802A CN114605875A CN 114605875 A CN114605875 A CN 114605875A CN 202210322802 A CN202210322802 A CN 202210322802A CN 114605875 A CN114605875 A CN 114605875A
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layer
double
inorganic composite
coating material
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CN114605875B (en
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王发洲
徐信刚
杨露
夏志林
刘志超
刘鹏
胡曙光
张文芹
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Wuhan University of Technology WUT
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    • C09D129/00—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 an alcohol, ether, aldehydo, ketonic, acetal, or ketal radical; Coating compositions based on hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Coating compositions based on derivatives of such polymers
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    • C09D129/04—Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
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    • B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
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    • 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
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    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
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    • 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
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    • C09D127/00—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 a halogen; Coating compositions based on derivatives of such polymers
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    • C09D131/00—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 an acyloxy radical of a saturated carboxylic acid, of carbonic acid, or of a haloformic acid; Coating compositions based on derivatives of such polymers
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    • 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
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    • C09D143/00—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 containing boron, silicon, phosphorus, selenium, tellurium, or a metal; Coating compositions based on derivatives of such polymers
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    • C09D153/00—Coating compositions based on block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Coating compositions based on derivatives of such polymers
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    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
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    • C09D7/40—Additives
    • C09D7/60—Additives non-macromolecular
    • C09D7/61—Additives non-macromolecular inorganic
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    • C08L2201/00—Properties
    • C08L2201/08—Stabilised against heat, light or radiation or oxydation

Abstract

The invention relates to a double-layer organic-inorganic composite building energy-saving coating material and a preparation method thereof, wherein the double-layer organic-inorganic composite building energy-saving coating material comprises an interface combination induction layer and a radiation cooling protective layer, wherein: the interface combination inducing layer comprises the following components in parts by mass: 70-115 parts of organic binder and 40-90 parts of nano CaCO310-70 parts of water, 60-100 parts of magnesium phosphate cement and 5-10 parts of boric acid; the radiation cooling protective layer comprises the following components in parts by mass: 60 to 120 parts of gamma-C2S, 40-120 parts of water, 0.1-5 parts of solar radiation reflecting agent, 5-30 parts of heat-insulating filler and 3-20 parts of polytetrafluoroethylene emulsion. The coating has excellent solar radiation reflection effect and long-wave mid-infrared transparent window refrigeration effect, can realize the cooling at 4-9 ℃, and has the refrigeration power of more than 61 W.m‑2。

Description

Double-layer organic-inorganic composite building energy-saving coating material and preparation method thereof
Technical Field
The invention relates to the field of building radiation cooling coating, in particular to a double-layer organic-inorganic composite building energy-saving coating material and a preparation method thereof.
Background
Although the climate sciences are striving to find effective solutions for global warming and acceleration of greenhouse gas emissions, the effects of solutions are very limited. Conceptually, one of the most effective strategies is to reduce the amount of solar radiation absorbed by the earth. For example, by solar radiation management, mitigating or reversing global warming, the basic idea behind solar radiation management is to seed reflective particles into the earth's stratosphere to reduce solar absorption, which can pose a potentially dangerous threat to the earth's basic climatic activities. Another possible method is passive radiative cooling, where the earth can radiate heat through an atmospheric long wave infrared transparency window (8-13 μm) into the supercooled outer space, thereby achieving spontaneous cooling of the earth.
However, Passive Daytime Radiative Cooling (PDRC) is a particular challenge below ambient temperature in direct sunlight, as most natural thermal radiating materials also absorb solar radiation and heat up rapidly upon exposure to the sun. Thus, a highly efficient solar reflectivity (0.3-2.5 μm) is designed and manufactured to minimize solar thermal gain and simultaneously increase the thermal emissivity of the mid-infrared transparent window; meanwhile, the temperature difference between the radiation cooling device and the exposed atmosphere is reduced, and the convection diffusion of heat caused by the temperature difference is avoided. The temperature of the earth can reach its steady state when radiant heat from the sun is in radiative equilibrium with the outward radiant heat. Therefore, the PDRC technology is very promising to reduce the use of compressor-based cooling systems (e.g., air conditioning) significantly and has a significant impact on global energy consumption.
Patent CN210390369U discloses an antioxidant radiation refrigeration film, which has good reflection capability and emission capability, but the mechanical strength of the film is not high, and the service life of the film is low in complex building environment. Patent CN202110184247.3 discloses a radiation refrigeration coating with long afterglow luminescence property and a preparation method thereof, which have good refrigeration property and decorative effect, but the preparation of the coating requires the evaporation of water in suspension, can not be directly coated on the outer wall of a building, and has strict construction environment.
In addition, most of the current researches on daytime radiation cooling are organic materials, and the durability is poor. And poor compatibility with building surfaces leads to increased interfacial thermal resistance and lower real efficiency. How to apply the radiation cooling technology to the building field with high efficiency becomes a difficult point.
Disclosure of Invention
The invention aims to overcome the technical defects and provide a double-layer organic-inorganic composite building energy-saving coating material and a preparation method thereof, and the organic-inorganic composite coating is used for realizing the efficient utilization of radiation cooling in the building field so as to achieve the purposes of low carbon and environmental protection.
In order to achieve the technical purpose, the technical scheme of the coating material is as follows:
comprising an interfacial bonding inducing layer and a radiation cooling protective layer, wherein:
the interface combination inducing layer comprises the following components in parts by mass: 70-115 parts of organic binder and 40-90 parts of nano CaCO310-70 parts of water, 60-100 parts of magnesium phosphate cement and 5-10 parts of boric acid;
the radiation cooling protective layer comprises the following components in parts by mass: 60 to 120 parts of gamma-C2S, 40-120 parts of water, 0.1-5 parts of solar radiation reflecting agent, 5-30 parts of heat preservation filler and 3-20 parts of polytetrafluoroethylene emulsion.
Further, the organic binder is one or more of epoxy resin, acrylic emulsion, styrene-butadiene emulsion, redispersible emulsion powder, acrylic emulsion and silicone-acrylic emulsion, wherein the solid content of the emulsion is 48%.
Furthermore, the magnesium phosphate cement is composed of MgO and soluble phosphate, the soluble phosphate is one or more of monoammonium phosphate, diammonium phosphate and monopotassium phosphate, and the Mg/P molar ratio in the magnesium phosphate cement is 0.65-1.25.
Further, the solar radiation reflecting agent is modified inorganic salt, and the inorganic salt is SrAl2O4、BaMgAl10O17、MgGeO3、Sr2SiO4、Ba2SiO4、Y2Mo4O15、NaZnPO4、ZnO、SrTiO3、MgTiO3、BaTiO3、Ta2O5、ZrO2And Si3N4One or more of (a).
Further, the step of modifying the inorganic salt comprises: dispersing the inorganic salt in silica sol, aging for 2h, filtering, and drying for later use, wherein the concentration of the silica sol is 0.3mg/mL, and the mass ratio of the inorganic salt to the silica sol is 0.1-0.6.
Further, SrAl2O4、BaMgAl10O17、MgGeO3、Sr2SiO4、Ba2SiO4、Y2Mo4O15Doped with Dy3+、Mn2 +、Er3+、Eu2+、Nd3+、La3+And Tm3+At least one of (1).
Further, the heat preservation filler is as follows: vitrified micro bubbles, expanded perlite and SiO2Aerogel and TiO2One or more aerogels, the particle size of the vitrified micro bubbles and the expanded perlite is 0.1-45 mu m, and the SiO is2Aerogel and TiO2The specific surface area of the aerogel is 200-700 m2/g；
The solid content of the polytetrafluoroethylene emulsion is 60 percent.
The preparation method has the technical scheme that the preparation method comprises the following steps:
(1) uniformly mixing the components of the interface combination inducing layer, and coating the mixture on the surface of a base material, wherein the coating thickness is 0.1-2 mm;
(2) after the interface bonding induction layer reaches initial setting, uniformly mixing the components of the radiation cooling protective layer, coating the surface of the interface bonding induction layer with the coating thickness of 0.3-3 mm, and placing the surface in CO2Curing in the environment to form a hardened radiation-cooled protective layer.
Further, the mixing of the components of the interfacial bonding inducing layer in the step (1) is specifically: mixing magnesium phosphate cement with nano CaCO3After mixing evenly, adding water and organic binder, and stirring evenly for later use;
the component mixing of the radiation cooling protective layer in the step (2) is specifically as follows: uniformly mixing a solar radiation reflecting agent and a heat preservation filler, and stirring and dispersing in an ultrasonic environment; finally adding gamma-C2And S and polytetrafluoroethylene emulsion are uniformly stirred for later use.
Further, the curing conditions in the step (2) are as follows: CO 22The concentration is 5% -100%, CO2The partial pressure is 0.01 to 7.4MPa, and the carbonization time is 0.1 to 72 hours.
Compared with the prior art, the invention has the beneficial effects that:
(1) the double-layer organic-inorganic composite radiation cooling coating has excellent solar radiation reflection effect and long-wave middle infrared transparent window refrigeration effect, the solar radiation reflectivity of a wave band of 0.3-2.5 mu m and the emissivity of a long-wave middle infrared transparent window of a wave band of 8-14 mu m respectively exceed 0.91 and 0.90, the cooling at 4-9 ℃ can be realized, and the refrigeration power exceeds 61 W.m-2。
(2) The double-layer organic-inorganic composite radiation cooling coating has good adaptability and compatibility of concrete buildings and steel structure buildings, good building bonding capacity, bonding strength of more than 2MPa and excellent interface performance, and causes small interface thermal resistance and high radiation refrigeration efficiency.
(3) The double-layer organic-inorganic composite radiation cooling coating has a double-layer structure. The outer radiation cooling protective layer is made of an inorganic carbonized material and a polytetrafluoroethylene coating, the inorganic carbonized material has excellent durability, extremely high long-wave middle infrared transparent window emissivity and good solar radiation reflection capability, the polytetrafluoroethylene coating is coated on the outermost layer, and the polytetrafluoroethylene is called 'plastic king' and has extremely good cold resistance, heat resistance and aging resistance. The organic interface combination inducing layer can be effectively protected, damage to the coating caused by weathering, corrosion and the like can be reduced, and the capacities of radiation cooling and solar radiation reflection can be provided.
(4) The radiation cooling protective layer of the double-layer organic-inorganic composite radiation cooling coating uses gamma-C as a main material2S is a low-carbon carbonized gelled material, and CO is required to be absorbed in the coating curing process2Forms a hardened coating, so the invention is also a low-carbon and environment-friendly radiation cooling coating.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention provides a double-layer organic-inorganic composite radiation cooling building coating, which consists of an interface combination induction layer and a radiation cooling protective layer. The interface bonding inducing layer is coated between the radiation cooling protective layer and the building base layer in a brush coating mode, and the preparation process comprises the following steps:
(1) and mixing and stirring the powder required by the interface bonding induction layer and the adhesive uniformly, and then coating the mixture on the surface of the building base layer in a brushing, rolling or spraying manner, wherein the thickness is 0.1-2 mm.
(2) After the interface combination inducing layer reaches initial setting, coating slurry of the radiation cooling protective layer on the surface of the interface inducing layer in a spraying, rolling, brushing or pressing mode, wherein the thickness is 0.3-3 mm.
(3) Placing the coating obtained in the step (2) in CO2Curing in an environment to form a hardened radiation-cooled protective layer.
In the step (1), the interface bonding inducing layer comprises: 70-115 parts of organic binder and 40-90 parts of nano CaCO310-70 parts of water, 60-100 parts of magnesium phosphate cement and 5-10 parts of boric acid.
The preparation process of the interface combination inducing layer comprises the following steps: mixing magnesium phosphate cement with nano CaCO3And after uniformly mixing, adding water and stirring, simultaneously adding an organic binder, and uniformly stirring to prepare the interface bonding inducing layer coating material.
The organic binder is one or a combination of epoxy resin, acrylic emulsion, butylbenzene emulsion, redispersible emulsion powder, acrylic emulsion and silicone-acrylic emulsion, and preferably, the solid content of the emulsion is 48%.
The magnesium phosphate cement is composed of MgO and soluble phosphate, wherein the soluble phosphate is one or a combination of more of ammonium dihydrogen phosphate, diammonium hydrogen phosphate and potassium dihydrogen phosphate. Preferably, the Mg/P molar ratio of the magnesium phosphate cement is 0.65-1.25.
In the step (2), the radiation cooling protective layer comprises the following components: 60 to 120 parts of gamma-C2S, 40-120 parts of water, 0.1-5 parts of solar radiation reflecting agent, 5-30 parts of heat-insulating filler and 3-20 parts of polytetrafluoroethyleneAn olefin emulsion.
The solar radiation reflecting agent is as follows: modified SrAl2O4Modified BaMgAl10O17Modified MgGeO3Modified (Sr, Ba)2SiO4Modified Y2Mo4O15Modified NaZnPO4Modified ZnO and modified SrTiO3Modified MgTiO3Modified BaTiO3Modified Ta2O5Modified ZrO2And modified Si3N4One or more of (a) or (b). The modification method is to use the SrAl2O4、BaMgAl10O17、MgGeO3、(Sr、Ba)2SiO4、Y2Mo4O15、NaZnPO4、ZnO、ZrO2、SrTiO3、MgTiO3、BaTiO3、Ta2O5And Si3N4Magnetically stirring and dispersing the powder in silica sol, aging for 2h, filtering, and drying for later use, wherein the concentration of the silica sol is 0.3mg/mL, and the mass ratio of the powder to the silica sol is 0.1-0.6; and SrAl2O4、BaMgAl10O17、MgGeO3、(Sr、Ba)2SiO4、Y2Mo4O15Doped with Dy3+、Mn2+、Er3+、Eu2+、Nd3+、La3+And Tm3+And (3) at least one of them, it is sufficient that the doped material is capable of emitting light.
The heat-insulating filler is as follows: vitrified micro bubbles, expanded perlite and SiO2Aerogel and TiO2One or more of aerogel, the grain diameter of the vitrified micro bubbles and the expanded perlite is 0.1-45 mu m, and the grain diameter of the SiO is2Aerogel and TiO2The specific surface area of the aerogel is 200-700 m2/g。
The preparation method of the radiation cooling protective layer coating comprises the following steps: after being uniformly mixed, the solar radiation reflecting agent and the heat preservation filler are stirred and dispersed in an ultrasonic environment; finally adding gamma-C2S and polytetrafluoroethylene emulsion (solid content is 60 percent), and the emulsion is formed by stirring evenlyAnd (3) coating the slurry of the radiation cooling protective layer on the surface of the interface combination inducing layer by spraying, rolling, brushing or pressing.
Said CO2Maintenance of the environment, CO2The concentration is 5% -100%, CO2The partial pressure is 0.01 to 7.4MPa, and the carbonization time is 0.1 to 72 hours. The invention can be used for air-jet maintenance, can also be used for air-blowing maintenance in a film through a coating, can also be used for coating of a building prefabricated part, and can be carbonized in a carbonization pressure barrel.
The double-layer organic-inorganic composite radiation cooling coating has the advantages of high-efficiency radiation cooling effect, excellent building compatibility of concrete and steel structures, high durability and long service life.
The invention has a two-layer structure of an interface bonding induction layer and a composite radiation cooling protective layer, wherein the interface bonding induction layer is arranged between the radiation cooling protective layer and a building base layer, thus not only having the function of improving the bonding capability of the whole coating and the building; the growth of a carbonization product of the radiation cooling protective layer at the interface of the double-layer coating can be induced, the integrity of the coating is improved, and the weakening of cooling efficiency caused by interface thermal resistance is reduced; and the layer has the capability of carrying out radiation cooling through the long-wave mid-infrared transparent window, so that the overall radiation cooling efficiency of the coating is further improved.
The radiation cooling protective layer improves the reflectivity of the coating to solar radiation by adding a solar radiation reflecting agent, reduces the absorption of the coating to solar radiation, and obtains good radiation cooling capacity by means of the high and medium infrared transparent window emissivity of a self-carbonized product.
In addition, the addition of the heat-insulating filler reduces the reduction of the refrigeration power of the coating caused by convection heat transfer due to different internal and external temperature differences.
The invention provides a double-layer organic-inorganic composite radiation cooling building coating, which realizes high-efficiency radiation cooling by utilizing a long-wave middle-infrared transparent window and simultaneously reflects solar radiation, and can utilize and absorb CO2And the method is low-carbon and environment-friendly. The outer radiation cooling protective layer has high strength and good durability, and can effectively protect the inner organic inducing layerThe radiation refrigeration system has the advantage of long service life, and realizes the efficient utilization of radiation refrigeration in the field of buildings.
The present invention will be further specifically described below with reference to specific examples.
Example 1
The interface bonding inducing layer of this example was composed of: 100 parts of organic binder and 60 parts of nano CaCO356 parts of water, 5 parts of boric acid and 60 parts of magnesium phosphate cement.
The organic binder is a combination of epoxy resin and polyvinyl alcohol latex powder, and the mass ratio is 1: 2.
The magnesium phosphate cement consists of potassium dihydrogen phosphate and magnesium oxide, and the Mg/P molar ratio is 0.7.
The radiation cooling protective layer comprises the following components: 80 parts of gamma-C2S, 70 parts of water, 4 parts of solar radiation reflecting agent, 20 parts of heat preservation filler and 16 parts of polytetrafluoroethylene emulsion.
The solar radiation reflecting agent is as follows: modified NaZnPO4And MgGeO3The mass ratio of the two components is 1: 2. The mass ratio of the inorganic salt powder to the silica sol in the modification process is 0.4.
The heat-insulating filler is SiO2An aerogel.
Respectively coating an interface combination inducing layer and a radiation cooling protective layer on a concrete substrate in a spraying mode according to the steps of the invention, wherein the spraying thickness of the interface combination inducing layer is 0.4mm, and the spraying thickness of the radiation cooling protective layer is 2 mm; CO at 0.1MPa2Carbonizing and curing for 24h under pressure with CO2The concentration is 100%, and the double-layer organic-inorganic composite radiation cooling coating is prepared.
Example 2
The interface bonding inducing layer of this example was composed of: 125 parts of organic binder and 67 parts of nano CaCO365 parts of water, 6 parts of boric acid and 70 parts of magnesium phosphate cement.
The organic binder is acrylic emulsion.
The magnesium phosphate cement consists of diammonium hydrogen phosphate and magnesium oxide, and the Mg/P molar ratio is 0.72.
Radiation cooled protective layer compositionComprises the following steps: 110 parts of gamma-C2S, 90 parts of water, 2 parts of a solar radiation reflecting agent, 15 parts of a heat insulation filler and 12 parts of polytetrafluoroethylene emulsion.
The solar radiation reflecting agent is as follows: modified SrTiO3And ZrO2The mass ratio is 1: 2. The mass ratio of the inorganic salt powder to the silica sol in the modification process is 0.5.
The heat-insulating filler is TiO2An aerogel.
According to the steps of the invention, an interface combination inducing layer and a radiation cooling protective layer are respectively coated on a concrete substrate in a spraying mode, the spraying thickness of the interface combination inducing layer is 0.6mm, and the spraying thickness of the radiation cooling protective layer is 2.5 mm; CO at atmospheric pressure2Carbonizing and curing for 24h under the environment with CO2The concentration is 90%, and the double-layer organic-inorganic composite radiation cooling coating is prepared.
Example 3
The interface bonding inducing layer of the present embodiment is composed of: 145 parts of organic binder and 70 parts of nano CaCO380 parts of water, 7 parts of boric acid and 87 parts of magnesium phosphate cement.
The organic binder is styrene-butadiene emulsion.
The magnesium phosphate cement consists of ammonium dihydrogen phosphate and magnesium oxide, and the Mg/P molar ratio is 0.94.
The radiation cooling protective layer comprises the following components: 75 parts of gamma-C2S, 36 parts of water, 5 parts of a solar radiation reflecting agent, 10 parts of a heat preservation filler and 7 parts of a polytetrafluoroethylene emulsion.
The solar radiation reflecting agent is as follows: modified MgTiO3And modified Si3N4The mass ratio of the two components is 3: 2.
The heat-insulating filler is SiO2Aerogel and TiO2The aerogel composition is 1:1 in mass ratio. The mass ratio of the inorganic salt powder to the silica sol in the modification process is 0.3.
According to the steps of the invention, an interface combination inducing layer and a radiation cooling protective layer are respectively coated on a concrete substrate in a spraying mode, the spraying thickness of the interface combination inducing layer is 0.8mm, and the spraying thickness of the radiation cooling protective layer is 1.5mm; CO at 0.2MPa2Carbonizing and curing for 24h under pressure with CO2The concentration is 30 percent, and the double-layer organic-inorganic composite radiation cooling coating is prepared.
Example 4
The interface bonding inducing layer of this example was composed of: 109 parts of organic binder and 80 parts of nano CaCO390 parts of water, 5 parts of boric acid and 68 parts of magnesium phosphate cement.
The organic binder is dispersible latex powder.
The magnesium phosphate cement consists of ammonium dihydrogen phosphate and magnesium oxide, and the Mg/P molar ratio is 0.76.
The radiation cooling protective layer comprises the following components: 65 parts of gamma-C2S, 32 parts of water, 0.5 part of solar radiation reflecting agent, 26 parts of heat preservation filler and 6 parts of polytetrafluoroethylene emulsion.
The solar radiation reflecting agent is as follows: modified Si3N4And ZrO2The mass ratio of the two components is 2: 3. The mass ratio of the inorganic salt powder to the silica sol in the modification process is 0.2.
The heat-insulating filler is glass micro-beads and SiO2The aerogel composition is 1:3 in mass ratio.
Respectively coating an interface bonding induction layer and a radiation cooling protective layer on a concrete substrate in a spraying manner according to the steps of the invention, wherein the spraying thickness of the interface bonding induction layer is 1.2mm, and the spraying thickness of the radiation cooling protective layer is 1.4 mm; CO at 0.3MPa2Carbonizing and curing for 24h under pressure with CO2The concentration is 50%, and the double-layer organic-inorganic composite radiation cooling coating is prepared.
Example 5
The interface bonding inducing layer of this example was composed of: 135 parts of organic binder and 60 parts of nano CaCO378 parts of water, 8 parts of boric acid and 86 parts of magnesium phosphate cement.
The organic binder is ethyl acetate copolymer emulsion.
The magnesium phosphate cement consists of potassium dihydrogen phosphate and magnesium oxide, and the Mg/P molar ratio is 0.85.
The radiation cooling protective layer comprises the following components: 88 parts of gamma-C2S, 47 parts of water, 2 parts of a solar radiation reflecting agent, 10 parts of a heat preservation filler and 9 parts of a polytetrafluoroethylene emulsion.
The solar radiation reflecting agent is as follows: modified SrAl2O4And modified NaZnPO4The mass ratio of the two components is 3: 2. The mass ratio of the inorganic salt powder to the silica sol in the modification process is 0.1.
The heat-insulating filler is TiO2The mass ratio of the aerogel to the expanded perlite is 3: 1.
Respectively coating an interface combination inducing layer and a radiation cooling protective layer on a concrete substrate in a spraying mode according to the steps of the invention, wherein the spraying thickness of the interface combination inducing layer is 1.6mm, and the spraying thickness of the radiation cooling protective layer is 0.8 mm; CO at 0.1MPa2Carbonizing and curing for 24h under pressure with CO2The concentration is 60%, and the double-layer organic-inorganic composite radiation cooling coating is prepared.
Example 6
The interface bonding inducing layer of this example was composed of: 150 parts of organic binder and 52 parts of nano CaCO363 parts of water, 6 parts of boric acid and 75 parts of magnesium phosphate cement.
The organic binder is a combination of silicone acrylic emulsion and pure acrylic emulsion, and the mass ratio is 1: 1.
The magnesium phosphate cement comprises monopotassium phosphate, ammonium dihydrogen phosphate and magnesium oxide, wherein the mass ratio of the monopotassium phosphate to the ammonium dihydrogen phosphate is 1:1, and the Mg/P molar ratio is 1.1.
The radiation cooling protective layer comprises the following components: 96 parts of gamma-C2S, 53 parts of water, 4 parts of a solar radiation reflecting agent, 17 parts of a heat preservation filler and 8 parts of a polytetrafluoroethylene emulsion.
The solar radiation reflecting agent is as follows: modified Si3N4And modified ZrO2The mass ratio of the two is 2: 1. The mass ratio of the inorganic salt powder to the silica sol in the modification process is 0.6.
The heat-insulating filler is SiO2The mass ratio of the aerogel to the expanded perlite is 3: 2.
The interface bonding inducing layer and the spoke are respectively combined according to the steps of the inventionThe spraying and cooling protective layer is coated on the concrete substrate in a spraying mode, the spraying thickness of the interface combination inducing layer is 1.8mm, and the spraying thickness of the radiation cooling protective layer is 0.5 mm; CO at 0.2MPa2Carbonizing and curing for 24h under pressure with CO2The concentration is 100%, and the double-layer organic-inorganic composite radiation cooling coating is prepared.
The above examples are stirred according to the corresponding proportion under the same stirring system, and coated on the cement boards of the same material, and the carbonization curing is carried out at room temperature for the corresponding time and system according to the corresponding carbonization curing system. And testing the reflectivity of the cured product in a solar radiation spectrum band and the radiation emissivity of an 8-13 mu m 'atmospheric window' by using an ultraviolet spectrophotometer and a Fourier infrared spectrum method. And the radiation cooling capacity and the bonding strength are tested, and the test results are shown in table 1. The temperature reduction amplitude is that the substrate with the coating is used as an upper cover of a cavity to form a sealing structure, the substrate is placed under the sun from twelve o 'clock at noon to 2 o' clock at afternoon, the temperature of the outer surface of the coating and the temperature in the cavity are tested, and the temperature reduction amplitude is obtained according to the difference value of the two temperatures; the cooling power test is carried out by placing a resistance heating plate at the bottom of the coating, and detecting and balancing the temperature difference between the heating plate and the coating through a sensor. And after the temperature is balanced, calculating the input power of the heating plate so as to estimate the refrigeration power of the coating.
TABLE 1 results of the experiments of the above examples
Figure BDA0003572391820000091
As can be seen from Table 1, the present invention has good reflectivity and atmospheric window emissivity, and has excellent cooling ability and refrigeration effect. The adhesive strength is more than 2MPa (2.46-2.94 MPa), the building adhesive has excellent building bonding capacity, which is not possessed by other radiation refrigeration coatings, the outer layer is mainly made of an inorganic carbonized material, the building adhesive has excellent ultraviolet aging resistance and weathering resistance, and carbon dioxide is consumed in the preparation process, so that the building adhesive is a carbon negative environment-friendly material. The outermost coating is a polytetrafluoroethylene coating, known as "King of plastics", which has excellent cold, heat, and aging resistance. The invention reduces the energy consumption of the building through radiation refrigeration, has excellent building compatibility, can effectively protect the building from erosion, is a green and environment-friendly radiation refrigeration coating, and has wide application prospect.
The invention discloses a double-layer organic-inorganic composite radiation cooling building coating, which comprises an interface combination induction layer and a radiation cooling protective layer. The interface combination inducing layer has high middle infrared radiation transmittance, good combination capacity of the substrate layer and the protective layer and carbonization inducing capacity of the protective layer. Can be radiated and cooled through the long-wave intermediate infrared transparent window, reduces the interface thermal resistance by depending on good compatibility with the matrix, and improves the heat exchange efficiency. The radiation cooling protective layer has good solar radiation reflectivity, excellent long-wave middle infrared radiation emissivity and high durability. The radiation cooling in the building is realized through the integral high and medium infrared radiation emissivity and high solar radiation reflectivity of the coating. The simultaneous radiation cooling protective layer adopts CO2Maintenance by absorbing CO2The mode realizes the strengthening and hardening of the coating, and has the advantages of low carbon and environmental protection. In addition, the radiation cooling protective layer has better weather resistance and rainwater showering resistance, and has longer service life.
The above-described embodiments of the present invention should not be construed as limiting the scope of the present invention. Any other corresponding changes and modifications made according to the technical idea of the present invention should be included in the protection scope of the claims of the present invention.

Claims (10)

1. A double-layer organic-inorganic composite building energy-saving coating material is characterized by comprising an interface combination inducing layer and a radiation cooling protective layer, wherein:
the interface combination inducing layer comprises the following components in parts by mass: 70-115 parts of organic binder and 40-90 parts of nano CaCO310-70 parts of water, 60-100 parts of magnesium phosphate cement and 5-10 parts of boric acid;
the radiation cooling protective layer comprises the following componentsThe components in parts by mass are as follows: 60 to 120 parts of gamma-C2S, 40-120 parts of water, 0.1-5 parts of solar radiation reflecting agent, 5-30 parts of heat preservation filler and 3-20 parts of polytetrafluoroethylene emulsion.
2. The double-layer organic-inorganic composite energy-saving building coating material of claim 1, wherein the organic binder is one or more of epoxy resin, acrylic emulsion, styrene-butadiene emulsion, redispersible latex powder, acrylic emulsion and silicone-acrylic emulsion, and the solid content of the emulsion is 48%.
3. The double-layer organic-inorganic composite energy-saving building coating material of claim 1, wherein the magnesium phosphate cement is composed of MgO and soluble phosphate, the soluble phosphate is one or more of ammonium dihydrogen phosphate, diammonium hydrogen phosphate and potassium dihydrogen phosphate, and the Mg/P molar ratio in the magnesium phosphate cement is 0.65-1.25.
4. The double-layer organic-inorganic composite energy-saving coating material for building of claim 1, wherein the solar radiation reflecting agent is modified inorganic salt, and the inorganic salt is SrAl2O4、BaMgAl10O17、MgGeO3、Sr2SiO4、Ba2SiO4、Y2Mo4O15、NaZnPO4、ZnO、SrTiO3、MgTiO3、BaTiO3、Ta2O5、ZrO2And Si3N4One or more of (a).
5. The double-layer organic-inorganic composite building energy-saving coating material according to claim 4, wherein the inorganic salt modification step comprises: dispersing the inorganic salt in silica sol, aging for 2h, filtering, and drying for later use, wherein the concentration of the silica sol is 0.3mg/mL, and the mass ratio of the inorganic salt to the silica sol is 0.1-0.6.
6. According to claimThe double-layer organic-inorganic composite energy-saving coating material for buildings, according to claim 4, is characterized in that SrAl2O4、BaMgAl10O17、MgGeO3、Sr2SiO4、Ba2SiO4、Y2Mo4O15Doped with Dy3+、Mn2+、Er3+、Eu2+、Nd3+、La3+And Tm3+At least one of (a).
7. The double-layer organic-inorganic composite building energy-saving coating material as claimed in claim 1, wherein the heat-insulating filler is: vitrified micro bubbles, expanded perlite and SiO2Aerogel and TiO2One or more aerogels, the particle size of the vitrified micro bubbles and the expanded perlite is 0.1-45 mu m, and the SiO is2Aerogel and TiO2The specific surface area of the aerogel is 200-700 m2/g；
The solid content of the polytetrafluoroethylene emulsion is 60 percent.
8. The preparation method of the double-layer organic-inorganic composite building energy-saving coating material as claimed in any one of claims 1 to 7, characterized by comprising the following steps:
(1) uniformly mixing the components of the interface combination inducing layer, and coating the mixture on the surface of a base material, wherein the coating thickness is 0.1-2 mm;
(2) after the interface bonding induction layer reaches initial setting, uniformly mixing the components of the radiation cooling protective layer, coating the surface of the interface bonding induction layer with the coating thickness of 0.3-3 mm, and placing the surface in CO2Curing in the environment to form a hardened radiation-cooled protective layer.
9. The preparation method of the double-layer organic-inorganic composite building energy-saving coating material according to claim 8, wherein the mixing of the components of the interface bonding inducing layer in the step (1) is specifically as follows: mixing magnesium phosphate cement with nano CaCO3After mixing evenly, adding water and organic binder, and stirring evenly for later use;
spoke in step (2)The injection cooling protective layer comprises the following components in percentage by weight: uniformly mixing a solar radiation reflecting agent and a heat preservation filler, and stirring and dispersing in an ultrasonic environment; finally adding gamma-C2And S and polytetrafluoroethylene emulsion are uniformly stirred for later use.
10. The preparation method of the double-layer organic-inorganic composite building energy-saving coating material according to claim 8, wherein the curing conditions in the step (2) are as follows: CO 22Concentration of 5% -100%, CO2The partial pressure is 0.01 to 7.4MPa, and the carbonization time is 0.1 to 72 hours.
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