High-weather-resistance transparent coating for radiation cooling and preparation method of high-weather-resistance transparent coating

Abstract

The invention discloses a high-weather-resistance transparent coating for radiation cooling and a preparation method of the high-weather-resistance transparent coating, and relates to the technical field of radiation cooling. The invention relates to a fluorine-carbon resin coating which comprises the following components in parts by weight: 10-20 parts of FEVE fluorocarbon resin, 10-50 parts of an organic solvent, 0-10 parts of silicon dioxide (SiO2) microspheres, 0.1-1 part of indium tin oxide (ITO) particles and 1-2 parts of a curing agent. According to the invention, the SiO2 microspheres are added into the FEVE fluorocarbon resin, so that the coating has high emissivity while maintaining high weather resistance, and plays a role in cooling. Meanwhile, the ITO particles are added into the coating, so that the coating keeps transparency and selectively shields near-infrared light, the heat of the sun penetrating through the glass is greatly reduced, and the cooling effect is improved. Compared with a conventional transparent radiation cooling material, the transparent radiation cooling material is simple in preparation process, low in cost and excellent in weather resistance and cooling effect, and has a good market application prospect.

Description

Technical Field

[0001] The invention relates to the technical field of radiation cooling, and in particular to a highly weather-resistant transparent coating for radiation cooling and a preparation method thereof. Background Art

[0002] As a major energy consumer, the building industry accounts for about 36% of global energy consumption, of which about 65% is consumed by heating, ventilation and air conditioning (HVAC) systems, which account for 1 / 3 of carbon dioxide emissions. Therefore, it is of great significance to develop new cooling technologies without any energy consumption and greenhouse gas emissions. Sky radiation technology (RSC) radiates heat to outer space with a temperature of about 3K by radiation, without consuming any energy. It can not only greatly reduce cooling energy consumption, but also provide a new way to meet the challenge of global warming.

[0003] In the demand for indoor cooling load, solar heat gain through glass windows is an important part that cannot be ignored, but current radiation cooling materials usually adopt an opaque appearance such as super bright or white to reflect sunlight as much as possible. If these materials are used on glass surfaces, it will not only increase the demand for lighting, but also greatly affect the quality of life and work of people. Therefore, preparing a radiation cooling material that can be mass-produced, low-cost, easy to construct, highly weather-resistant, and can cool down the room under the premise of high transparency is the focus and difficulty of building energy conservation.

[0004] Chinese patent 202210809407.3 discloses "A method for preparing a transparent radiation cooling material", which prepares a coating with high transparency and high emissivity by adding inorganic particles to a nanocellulose solution. However, the coating in this invention cannot selectively shield near-infrared sunlight. If it is applied to buildings or car windows, there will still be a lot of solar heat gain indoors, and the radiation cooling effect is limited.

[0005] Chinese patent 202111443089.5 discloses "A composite transparent film, its preparation method and application", which adds SiO2 microspheres and indium tin oxide particles to polyethylene to prepare a film that can achieve high transparency, selective shielding of near-infrared light and high emissivity. However, in this invention, due to the poor weather resistance of polyethylene, additional ultraviolet absorbers and antioxidants need to be added, and the film preparation process needs to be carried out at a temperature above 125°C, which is harsh and costly. Summary of the invention

[0006] The purpose of the present invention is to provide a highly weather-resistant transparent coating for radiative cooling and a preparation method thereof, wherein the coating has high transparency, high weather resistance, excellent radiative cooling effect and is easy to prepare, so as to solve the limitation that existing radiative cooling coatings cannot be applied to architectural / vehicle glass.

[0007] The present invention is achieved through the following technical solutions:

[0008] A highly weather-resistant transparent coating for radiation cooling, comprising FEVE fluorocarbon resin, organic solvent, silicon dioxide (SiO2) microspheres, indium tin oxide (ITO) particles, and a curing agent;

[0009] As an embodiment of the present invention, the highly weather-resistant transparent coating for radiation cooling is mainly composed of the following raw materials in parts by weight: 10 to 20 parts of FEVE fluorocarbon resin, 10 to 50 parts of organic solvent, 0 to 10 parts of SiO2 microspheres, 0.1 to 1 part of ITO particles, and 1 to 2 parts of curing agent.

[0010] As an embodiment of the present invention, the FEVE fluorocarbon resin may be one of a copolymer of chlorotrifluoroethylene and vinyl ether, and a copolymer of fluoroolefin and alkyl vinyl ether or alkyl vinyl ester.

[0011] As an embodiment of the present invention, the organic solvent may be one or more of toluene, xylene, butyl acetate, ethyl acetate, mineral turpentine, ethyl ethoxypropionate, and methyl ethyl ketone.

[0012] As an embodiment of the present invention, the diameter of the SiO2 microspheres is 0.01 to 10 μm.

[0013] As an embodiment of the present invention, the diameter of the ITO particles is 5 to 100 nm.

[0014] As an embodiment of the present invention, the curing agent is one or more of toluene diisocyanate, diphenylmethane diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, dicyclohexylmethane diisocyanate, lysine diisocyanate, and isocyanate trimerization derivatives.

[0015] The present invention also provides a method for preparing a highly weather-resistant transparent coating for radiation cooling, comprising the following steps:

[0016] Step 100, preparing a particle dispersion solution;

[0017] Step 200, mixing FEVE fluorocarbon resin with a particle dispersion solution, performing dispersion stirring to obtain a pre-dispersed coating;

[0018] Step 300: Ultrasonic treatment is performed on the pre-dispersed coating, and then a curing agent is added to obtain a finished coating.

[0019] As an embodiment of the present invention, in step 100, the preparation of the particle dispersion solution specifically includes:

[0020] Adding SiO2 microspheres and ITO particles to an organic solvent in sequence, stirring at room temperature for a first preset time, and then ultrasonically treating for a second preset time to obtain a particle dispersion solution;

[0021] Wherein, the first preset time is 20 to 30 minutes;

[0022] The second preset time is 30 to 50 minutes;

[0023] Ultrasonic power is 600-900W;

[0024] The ultrasound interval was set to 2 s.

[0025] As an embodiment of the present invention, in step 200, the dispersion stirring is achieved by a high-speed disperser;

[0026] Wherein, the dispersion frequency of the high-speed disperser is 6000r / min-8000r / min, and the dispersion time is 3-5h.

[0027] As an embodiment of the present invention, in step 300, the ultrasonic treatment is achieved by a cell disruptor;

[0028] The ultrasonic treatment time is 1 to 10 hours;

[0029] Ultrasonic power is 600-900W;

[0030] The ultrasound interval was set to 2 s.

[0031] Compared with the prior art, the beneficial effects of the present invention are:

[0032] (1) The coating of the present invention has high transmittance for visible light and can meet the lighting, living and working needs when applied to building / vehicle glass;

[0033] (2) The ITO particles in the coating of the present invention can selectively absorb near-infrared bands, which can greatly reduce indoor solar heat gain, and the FEVE fluorocarbon resin and SiO2 microspheres have high emissivity in the 8-13 μm atmospheric window, so the coating has an excellent indoor cooling effect;

[0034] (3) The FEVE fluorocarbon resin selected in the present invention has high weather resistance and does not require the addition of additional UV absorbers and antioxidants;

[0035] (4) The coating provided by the present invention can be prepared at room temperature, has low cost, can be mass-produced, has good bonding properties with glass, and has good market application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a structural schematic diagram of the present invention.

[0037] For ordinary technicians in this field, other relevant drawings can be obtained based on the above drawings without any creative work. DETAILED DESCRIPTION

[0038] In order to enable those skilled in the art to better understand the technical solution of the present invention, the technical solution of the present invention is further described below in conjunction with specific embodiments.

[0039] Example 1

[0040] like Figure 1 As shown, a highly weather-resistant transparent coating for radiation cooling is composed of FEVE fluorocarbon resin, organic solvent, SiO2 microspheres, ITO particles, and curing agent. FEVE fluorocarbon resin and SiO2 microspheres have high emissivity, and ITO nanoparticles selectively absorb near-infrared light, and can simultaneously achieve a transmittance of more than 50-90% for visible light, a shielding rate of more than 50-80% for near-infrared light, and an emissivity of more than 70-95% in the 8-13μm atmospheric window band. The coating can achieve excellent cooling effect when applied to building / vehicle glass.

[0041] The FEVE fluorocarbon resin may be one of a copolymer of chlorotrifluoroethylene and vinyl ether, a copolymer of fluoroolefin and alkyl vinyl ether or alkyl vinyl ester.

[0042] The organic solvent may be one or more of toluene, xylene, butyl acetate, ethyl acetate, mineral turpentine, ethyl ethoxypropionate, and methyl ethyl ketone.

[0043] The SiO2 microspheres have a diameter of 0.01 to 10 μm.

[0044] The ITO particles have a diameter of 5 to 100 nm.

[0045] The curing agent is one or more of toluene diisocyanate, diphenylmethane diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, dicyclohexylmethane diisocyanate, lysine diisocyanate, and isocyanate trimerization derivatives.

[0046] Compared with the existing technology, this transparent material has high weather resistance, can greatly reduce indoor solar heat gain while having high transparency, and has high emissivity in the 8-13μm atmospheric window. This technical means makes the application scope of radiation cooling technology more extensive, especially for building / vehicle glass, and the coating is easy to operate and can be applied on a large scale.

[0047] Example 2

[0048] SiO2 microspheres and ITO particles are added to an organic solvent in sequence, stirred at room temperature for 20 to 30 minutes, and then ultrasonically treated for 30 to 50 minutes by a cell crusher with an ultrasonic power of 600W to 900W and an ultrasonic interval of 2s to obtain a particle dispersion solution. Then, FEVE fluorocarbon resin is mixed with the particle dispersion solution, and stirred for 3 to 5 hours by a high-speed disperser at 6000r / min to 8000r / min to obtain a pre-dispersed coating. The pre-dispersed coating is ultrasonically treated for 1 to 10 hours by a cell crusher with an ultrasonic power of 600W to 900W and an ultrasonic interval of 2s, and then a curing agent is added to obtain a finished coating.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A highly weather-resistant transparent coating for radiation cooling and a preparation method thereof, characterized in that: The invention comprises the following components: FEVE fluorocarbon resin, organic solvent, silicon dioxide (SiO2) microspheres, indium tin oxide (ITO) particles and curing agent.

2. A highly weather-resistant transparent coating for radiation cooling according to claim 1, characterized in that: The invention is composed of the following raw materials in parts by weight: 10 to 20 parts of FEVE fluorocarbon resin, 10 to 50 parts of organic solvent, 0 to 10 parts of silicon dioxide (SiO2) microspheres, 0.1 to 1 part of indium tin oxide (ITO) particles, and 1 to 2 parts of curing agent.

3. A highly weather-resistant transparent coating for radiation cooling according to claim 1, characterized in that: The FEVE fluorocarbon resin may be one of a copolymer of chlorotrifluoroethylene and vinyl ether, a copolymer of fluoroolefin and alkyl vinyl ether or alkyl vinyl ester.

4. A highly weather-resistant transparent coating for radiation cooling according to claim 1, characterized in that: The organic solvent may be one or more of toluene, xylene, butyl acetate, ethyl acetate, mineral turpentine, ethyl ethoxypropionate, and methyl ethyl ketone.

5. A highly weather-resistant transparent coating for radiation cooling according to claim 1, characterized in that: The SiO2 microspheres have a diameter of 0.01 to 10 μm.

6. A highly weather-resistant transparent coating for radiation cooling according to claim 1, characterized in that: The ITO particles have a diameter of 5 to 100 nm.

7. A highly weather-resistant transparent coating for radiation cooling according to claim 1, characterized in that: The curing agent is one or more of toluene diisocyanate, diphenylmethane diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, dicyclohexylmethane diisocyanate, lysine diisocyanate, and isocyanate trimerization derivatives.

8. A method for preparing a highly weather-resistant transparent coating for radiation cooling, characterized in that: The steps include: Step 100, preparing a particle dispersion solution; Step 200, mixing FEVE fluorocarbon resin with a particle dispersion solution, dispersing and stirring to obtain a pre-dispersed coating; Step 300: ultrasonically treat the pre-dispersed coating, and then add a curing agent to obtain a finished coating product.

9. The method for preparing a highly weather-resistant transparent coating for radiation cooling according to claim 8, characterized in that In step 100, preparing the particle dispersion solution specifically includes: Adding SiO2 microspheres and ITO particles to an organic solvent in sequence, stirring at room temperature for a first preset time, and then ultrasonically treating for a second preset time to obtain a particle dispersion solution; Wherein, the first preset time is 20 to 30 minutes; The second preset time is 30 to 50 minutes; Ultrasonic power is 600-900W; The ultrasound interval was set to 2 s.

10. The method for preparing a highly weather-resistant transparent coating for radiation cooling according to claim 8, characterized in that In step 200, the dispersion stirring is achieved by a high-speed disperser; Wherein, the dispersion frequency of the high-speed disperser is 6000r / min-8000r / min, and the dispersion time is 3-5h.

11. The method for preparing a highly weather-resistant transparent coating for radiation cooling according to claim 8, characterized in that In step 300, the ultrasonic treatment is achieved by a cell disruptor; Among them, the ultrasonic treatment time is 1-10h; Ultrasonic power is 600-900W; The ultrasound interval was set to 2 s.

12. A highly weather-resistant transparent coating for radiation cooling and a preparation method thereof according to claim 1, characterized in that: The highly weather-resistant transparent coating has a transmittance of 50-90% in the visible light band, a shielding rate of 50-80% in the near infrared band, and an emissivity of more than 70-95% in the 8-13 μm atmospheric window band.

Images