CN109942865B - Preparation method of radiation cooling film - Google Patents
Preparation method of radiation cooling film Download PDFInfo
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- CN109942865B CN109942865B CN201910249909.3A CN201910249909A CN109942865B CN 109942865 B CN109942865 B CN 109942865B CN 201910249909 A CN201910249909 A CN 201910249909A CN 109942865 B CN109942865 B CN 109942865B
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Abstract
The invention discloses a radiation cooling film and a preparation method thereof, wherein the preparation method comprises the following steps: adding the high-molecular film-forming substance, the ultraviolet reflecting material and the auxiliary agent into a solvent, uniformly mixing, filtering by a filter screen to obtain a coating solution, coating the coating solution on a reflecting film, and drying to obtain the radiation cooling film. In the invention, the reflecting film has reasonable reflectivity and thickness, and provides a high-reflectivity basis for forming the radiation cooling film. The polymer film-forming substance and the auxiliary agent can be uniformly dissolved in the solvent, and a compact coating can be formed after the coating is coated on the reflecting film, so that the coating has the effects of water resistance, antibiosis, mildew resistance and the like. The ultraviolet reflecting material can reflect ultraviolet rays, further improves the reflectivity and has high radiance of 8-13 mu m. The radiation cooling film prepared by the invention has extremely high sunlight reflectivity and hemispherical emissivity, can realize a cooling effect by applying the radiation cooling film, and has a good application prospect.
Description
Technical Field
The invention relates to the field of environment-friendly and energy-saving materials, in particular to a preparation method of a radiation cooling film.
Background
Solar radiation brings high temperature to buildings and industrial facilities, and influences production and life. In order to cope with the high temperature of the facility, the temperature is generally reduced by adopting the forms of water spraying, air conditioning and the like, and heat is blocked by combining a heat insulation material. The resistance to high temperatures often requires a large amount of energy and therefore also entails a high energy consumption. Although the reflective thermal insulation coating technology can also obviously reduce the temperature of various facilities, active cooling cannot be realized, and the reflective thermal insulation coating technology can only be used as an auxiliary means to assist an air conditioner in cooling.
In recent years, the metamaterial with ultrahigh reflectivity and high radiance attracts people's extensive attention, can conveniently realize active cooling, and the cooling power can reach 50W/m2. However, the process requirements of the metamaterial are extremely high, multiple layers of metal oxides and metal thin films need to be evaporated, the cost is high, and the mass production is difficult. Scattered radiation cooling is creatively realized by professor Yang Rong Gui of university of Koro DoraProvides a way for the mass production of the cooling material. The invention patent 201810238449.X (CN 108250873A) discloses an outdoor all-weather sunlight reflection and infrared radiation refrigeration coating, which is characterized in that micron-sized spherical microbeads, micron-sized metal-plated platy bodies and/or micron-sized metal-plated spherical bodies are added into a coating system, and a layered coating mode is adopted to enable the metal-plated platy structure to realize sunlight high reflection and infrared high radiation, so that the passive refrigeration effect is achieved. However, because of the use of micron-sized metal-plated reflective materials, the reflectivity of the invention is relatively low, and meanwhile, the field process is complicated by adopting a layered coating mode.
The radiant cooling film developed by the invention has extremely high reflectivity and radiance, and meanwhile, has a convenient application process and certain innovation.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a preparation method of a radiation cooling film, which has extremely high reflectivity and radiance and simultaneously has a convenient application process. The energy-saving coating is applied to buildings and industrial facilities and has the advantages of high efficiency, energy conservation, convenient application, low maintenance cost and the like.
The invention adopts the following technical scheme:
a preparation method of a radiation cooling film comprises the following steps:
adding the high-molecular film-forming substance, the ultraviolet reflecting material and the auxiliary agent into a solvent, uniformly mixing, filtering by a filter screen to obtain a coating solution, coating the coating solution on a reflecting film, and drying to obtain the radiation cooling film.
In the invention, the reflecting film has reasonable reflectivity and thickness, and provides a high-reflectivity basis for forming the radiation cooling film. The polymer film-forming substance and the auxiliary agent can be uniformly dissolved in the solvent, and a compact coating can be formed after the coating is coated on the reflecting film, so that the coating has the effects of water resistance, antibiosis, mildew resistance and the like. The ultraviolet reflecting material can reflect ultraviolet rays, further improves the reflectivity and has high radiance of 8-13 mu m.
The parts of each component by weight are as follows:
the high molecular film forming substance is one or more than two (including two) of ethylene-vinyl acetate copolymer, aliphatic polyurethane, polyacrylate copolymer, polyvinyl butyral and organosilicon polymer. The high molecular film forming substance has the characteristics of good ultraviolet resistance function and hydrophobicity, and endows the coating with long service life and water resistance. One or more (including two) of aliphatic polyurethane, polyacrylate copolymer and silicone polymer are preferable.
The ultraviolet reflecting material is one or more than two (including two) of silicon dioxide, calcium carbonate, antimony trioxide, aluminum oxide, barium sulfate, zirconium oxide, zirconium silicate, sodium aluminum silicate, zinc phosphate and sodium zinc phosphate. The ultraviolet reflecting material does not absorb visible light and near infrared light, has high radiance of 8-13 mu m, and can further improve the reflectivity of 0.25-0.4 mu m. The ultraviolet reflecting material can convert specular reflection into diffuse reflection in a scattering mode, so that light pollution is avoided. One or more (including two) of silica, barium sulfate, zirconia, sodium aluminum silicate, and sodium zinc phosphate are preferable. Preferably, the ultraviolet reflecting material is two or more (including two) of silica, barium sulfate, zirconia, sodium aluminum silicate, and sodium zinc phosphate. Most preferably, the ultraviolet reflecting material is a mixture of sodium aluminum silicate, barium sulfate and aluminum oxide, and the three materials have synergistic action, so that the prepared radiation cooling film has extremely high sunlight reflectivity and hemispherical emissivity.
The particle size of the ultraviolet reflecting material is 0.1-10 μm, preferably 0.2-5 μm;
the auxiliary agent is one or more than two (including two) of dispersing agent, defoaming agent, cross-linking agent, thickening agent, curing agent, catalyst, antibacterial agent and mildew preventive. The auxiliary agent can improve the dispersibility of the ultraviolet reflecting material, adjust the viscosity of the coating solution and endow the coating with antibacterial and mildewproof properties.
The solvent is one or more (including two) of water, ethanol, isopropanol, n-propanol, n-butanol, isobutanol, butanone, pentanone, chloroform, dichloroethane, cyclohexane, methylcyclohexane, petroleum ether, ethyl acetate, butyl acetate, tetrahydrofuran and methyltetrahydrofuran. The solvent can quickly dissolve the high-molecular film-forming substance and the antibacterial agent, and has the advantages of low boiling point and low toxicity.
Most preferably, the preparation method of the radiation cooling film comprises the following steps:
adding 2.1 parts of dispersing agent and 1.4 parts of defoaming agent into 80 parts of isopropanol by weight, uniformly stirring, adding 60 parts of barium sulfate and 30 parts of alumina, dispersing for 30min, adding 20 parts of polyvinyl butyral and 3 parts of mildew-proof antibacterial agent, and uniformly stirring. Filtering with 200 mesh filter screen to obtain coating solution, coating 100 μm thick coating solution onto white reflective film of backlight module with anilox roller, and drying at 40 deg.C to obtain radiation cooling film. The prepared radiation cooling film has the solar reflectivity of 0.94 and the hemispherical emissivity of 0.95.
Most preferably, the preparation method of the radiation cooling film comprises the following steps:
adding 2.1 parts of dispersing agent and 1.4 parts of defoaming agent into 80 parts of isopropanol by weight, uniformly stirring, adding 30 parts of sodium aluminum silicate, 30 parts of barium sulfate and 30 parts of aluminum oxide, dispersing for 30min, adding 20 parts of polyvinyl butyral and 3 parts of mildew-proof antibacterial agent, and uniformly stirring. Filtering with 200 mesh filter screen to obtain coating solution, coating 100 μm thick coating solution onto white reflective film of backlight module with anilox roller, and drying at 40 deg.C to obtain radiation cooling film. The prepared radiation cooling film has the solar reflectivity of 0.97 and the hemispherical emissivity of 0.96.
The viscosity of the coating solution is 100-3000 cP, and preferably 1000-2500 cP.
The thickness of the coating solution coated on the reflecting film is 100-500 μm, preferably 200-400 μm.
The reflecting film is one of a BOPET aluminum plating film, a BOPP aluminum plating film, a BOPET silver plating film and a white reflecting film of the backlight module. The reflecting film has extremely high reflectivity, and preferably a BOPET aluminized film and a white reflecting film of a backlight module are selected.
The thickness of the reflecting film is 30-400 mu m. The visible light reflectivity of the reflecting film is not lower than 0.97.
The prepared radiation cooling film has the sunlight reflectivity of 0.94-0.97 and the hemispherical emissivity of 0.92-0.96.
Compared with the prior art, the invention has the following advantages:
1. the reflecting film and the ultraviolet reflecting material jointly form the radiation cooling film with ultrahigh reflectivity and radiance, and the performance of the radiation cooling film is superior to that of a layered coating material consisting of a metal-plated reflecting material and micron-sized spherical microbeads.
2. The preferable high molecular film forming substance has ultraviolet resistance and water resistance, and the service life of the coating is obviously prolonged.
3. The radiant cooling film can also provide a self-adhesive product, and has the advantage of convenience compared with coating.
Detailed Description
Example 1
2.1 parts of a dispersant (SN-5040, NOPROCEAE, SN-DEFOAMER 154), 1.4 parts of a defoaming agent (SN-DEFOAMER 154, NOPROCEAE, NOSPORT, 100 parts of water, 70 parts of barium sulfate (excellent product, modified precipitated barium sulfate, SANY, SAID) and 30 parts of silica are added and dispersed for 30min at room temperature of 25 deg.C, 40 parts of a polyurethane dispersion liquid (WAIKINAWAX chemical,
1629) 5 parts of a crosslinking agent (Wanhua chemistry,
161) 0.6 part of a thickener (Wanhua chemical,
u300), 0.5 part of antibacterial agent (BIT-20 in Hangzhou Roche chemical industry) and 0.4 part of mildew preventive (GNCE 5700-T50 in Guangzhou Jianice), stirringAnd (4) uniformly stirring. Filtering with 300 mesh filter screen to obtain coating solution, coating 200 μm thick coating solution onto BOPET aluminized film (packaging material, 30 μm thick) with anilox roller, and drying at 60 deg.C to obtain radiation cooling film.
Example 2
2.4 parts of dispersant (SN-5040, NOPROCEAE) and 1.6 parts of DEFOAMER (SN-DEFAOAMER 154, NOPROCEAE, NOCEAE, NOCENE, NOCEOUS, NOCESSIUM, NOCENE, NOCEMENT, NOCESSIUM, NOCESE, NOCESSIUM, 2.4, NOCESSIUM, 2, NOCESSIUM, 2.4, 2, 2.4, 2, 2.4,
u300), 0.6 part of antibacterial agent (BIT-20 in Hangzhou Roche chemical industry) and 0.9 part of mildew preventive (GNCE 5700-T50 in Guangzhou Jianice), and stirring uniformly. Filtering with 200 mesh filter screen to obtain coating solution, coating 300 μm thick coating solution onto self-adhesive BOPET aluminizer (from Hao technology, Zhongshan city, 75 μm thick) with anilox roller, and drying at 80 deg.C to obtain radiation cooling film.
Example 3
2 parts of dispersing agent (Nanjing eosin chemical industry, methyltrimethoxysilane) and 1.4 parts of defoaming agent (SN-DEFAOMER 154 in Nippon department, SN-DEFAOMER 154) are added into a mixed solvent of 60 parts of petroleum ether and 40 parts of ethanol at room temperature and 25 ℃, after uniform stirring, 80 parts of zirconium oxide (Bothon Bailey group, particle size 0.5-1 μm) and 20 parts of silicon dioxide (Baotou chemical industry, BT-303P) are added and dispersed for 30min, then 30 parts of polydimethylsiloxane (Hubei New Sihai chemical industry, SH-9502), 5 parts of curing agent (Nanjing eosin chemical industry, methyltriethoxysilane), 4 parts of mildew-proof antibacterial agent (Cantonese, GNCE5700-F) and 0.3 part of catalyst (Shanghai Arlatin reagent, P-methylbenzenesulfonic acid) are added and uniformly stirred. Filtering with 300 mesh filter screen to obtain coating solution, coating 400 μm thick coating solution onto BOPET aluminized film (120 μm thick packaging material in Dongliter of Xangnan county) with anilox roller, and drying at 50 deg.C to obtain radiation cooling film.
Example 4
At room temperature of 25 ℃, 2.1 parts of dispersing agent (Nanjing eosin chemical industry, methyltrimethoxysilane) and 1.4 parts of defoaming agent (Xinanjiang chemical industry, methyl silicone oil) are added into 80 parts of isopropanol, after uniform stirring, 60 parts of barium sulfate (Shanxi Fuji group, modified precipitated barium sulfate superior product) and 30 parts of alumina (Zibohongheng alumina micro powder) are added for dispersing for 30min, 20 parts of polyvinyl butyral (Qingdao Hao industry, SD-5) and 3 parts of mildew-proof antibacterial agent (Guangzhou Jianice, GNCE5700-F) are added and uniformly stirred. Filtering with 200 mesh filter screen to obtain coating solution, coating 100 μm thick coating solution onto white reflective film (Ningbo Zhi science and technology Co., Ltd., R400S) of backlight module with anilox roller, and drying at 40 deg.C to obtain radiation cooling film.
Example 5
Ultraviolet reflecting materials [ sodium aluminum silicate (30 parts of German Germany Texas, 820A), 30 parts of barium sulfate (Shanxi Rich group, modified precipitated barium sulfate superior product), and 30 parts of alumina (Zibo hong Heng alumina fine powder) ] are adopted to replace the ultraviolet reflecting materials in example 4 [60 parts of barium sulfate (Shanxi Rich group, modified precipitated barium sulfate superior product), and 30 parts of alumina (Zibo hong Heng alumina fine powder) ], and other conditions are the same as in example 4.
Comparative example 1
Ultraviolet reflecting material (90 parts rutile titanium dioxide (herboria group,
BLR-698)]alternative example 4 UV-reflecting Material [60 parts of barium sulfate (Shanxi Rich group, modified precipitated barium sulfate premium grade), 30 parts of alumina (Zibo hong Heng Al industry, alumina micropowder)]The other conditions were the same as in example 4.
Comparative example 2
Ultraviolet reflecting material (60 parts rutile titanium dioxide (white boa herley group,
BLR-698), 30 parts of alumina (Zibo hong Heng aluminium industry, alumina micropowder)]Alternative example 4 UV light reverseShot material [60 parts of barium sulfate (Shanxi Rich group, modified precipitated barium sulfate superior product), 30 parts of alumina (Zibo hong Heng aluminum industry, alumina micropowder)]The other conditions were the same as in example 4.
The method for testing the solar light reflectivity and the hemispherical emissivity comprises the following steps: the concrete results are shown in Table 1 with reference to the method of JG/T235-2014 reflective and heat-insulating building coating at 23 +/-2 ℃ and 50 +/-2% relative humidity:
table 1.
| Example 1 | Example 2 | Example 3 | Example 4 | Example 5 | Comparative example 1 | Comparative example 2 | |
| Solar reflectance | 0.94 | 0.95 | 0.95 | 0.94 | 0.97 | 0.87 | 0.89 |
| Hemispherical emissivity | 0.93 | 0.94 | 0.92 | 0.95 | 0.96 | 0.83 | 0.87 |
Comparative example 1 adopts the commonly used titanium dioxide as the ultraviolet reflecting material, the solar reflectance and the hemispherical emissivity are lower, the comparative example 2 adopts titanium dioxide and alumina as the ultraviolet reflecting materials, the solar reflectivity and the hemispherical emissivity are improved to a certain extent, but has obvious difference compared with the embodiment 4, the embodiment 4 adopts barium sulfate and aluminum oxide as ultraviolet reflecting materials, the solar reflectance of the prepared radiation cooling film can reach 0.94 and the hemispherical emissivity can reach 0.95, the embodiment 5 adopts sodium aluminum silicate, barium sulfate and aluminum oxide as ultraviolet reflecting materials, the solar reflectance of the prepared radiation cooling film can reach 0.97 and the hemispherical emissivity can reach 0.96, and the radiation cooling film has extremely high solar reflectance and hemispherical emissivity, therefore, sodium aluminum silicate, barium sulfate and aluminum oxide are used as ultraviolet reflecting materials, and a synergistic effect can be achieved.
Therefore, the radiation cooling film prepared by the invention has extremely high sunlight reflectivity and hemispherical emissivity, can realize a cooling effect by applying the radiation cooling film, and has a good application prospect.
Claims (3)
1. The preparation method of the radiation cooling film is characterized by comprising the following steps:
adding a high-molecular film forming substance, an ultraviolet reflecting material and an auxiliary agent into a solvent, uniformly mixing, filtering by a filter screen to obtain a coating solution, coating the coating solution on a reflecting film, and drying to obtain a radiation cooling film;
the parts of each component by weight are as follows:
20-60 parts of a high-molecular film forming substance;
80-120 parts of an ultraviolet reflecting material;
5-20 parts of an auxiliary agent;
80-140 parts of a solvent;
the high molecular film forming substance is one or more than two of ethylene-vinyl acetate copolymer, aliphatic polyurethane, polyacrylate copolymer, polyvinyl butyral and organic silicon polymer;
the ultraviolet reflecting material is a mixture of sodium aluminum silicate, barium sulfate and aluminum oxide;
the auxiliary agent is one or more than two of a dispersing agent, a defoaming agent, a cross-linking agent, a thickening agent, a curing agent, a catalyst, an antibacterial agent and a mildew preventive;
the solvent is one or more than two of water, ethanol, isopropanol, n-propanol, n-butanol, isobutanol, butanone, pentanone, chloroform, dichloroethane, cyclohexane, methylcyclohexane, petroleum ether, ethyl acetate, butyl acetate, tetrahydrofuran and methyltetrahydrofuran.
2. The method for preparing the radiation cooling film according to claim 1, wherein the thickness of the coating solution coated on the reflecting film is 100-500 μm.
3. The method for preparing the radiation cooling film according to claim 1, wherein the thickness of the reflecting film is 30-400 μm.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110317521A (en) * | 2019-07-05 | 2019-10-11 | 宁波瑞凌新能源科技有限公司 | Selective radiation refrigeration coating and its composite material and methods for using them |
| CN110483924B (en) | 2019-08-21 | 2021-06-15 | 陕西科技大学 | Super-hydrophobic self-cleaning radiation cooling film and preparation method thereof |
| CN111100551B (en) * | 2019-12-31 | 2021-11-09 | 宁波瑞凌新能源科技有限公司 | Repairing agent and application thereof |
| CN111574732B (en) * | 2020-04-29 | 2023-01-24 | 杭州净碳科技有限公司 | Preparation method of low-cost radiation cooling film |
| CN111574878A (en) * | 2020-04-29 | 2020-08-25 | 诸暨瑞讯新材料有限公司 | Multilayer radiation cooling coating and preparation method thereof |
| CN111808312B (en) * | 2020-09-11 | 2020-12-01 | 宁波瑞凌新能源科技有限公司 | Refrigeration film |
| CN114790350A (en) * | 2022-05-31 | 2022-07-26 | 武汉理工大学 | Water-based radiation cooling coating and preparation method and application thereof |
| CN117126606A (en) * | 2023-08-08 | 2023-11-28 | 重庆建模节能环保科技有限公司 | Efficient energy-saving composite cooling film and preparation method thereof |
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