Preparation method of reflective radiation type cooling coating for assembling wall surface of electric power facility

Abstract

The invention provides a preparation method of a reflective radiation type cooling coating for assembling a wall surface of an electric power facility. According to the cooling coating, PDMS is mainly used as a substrate and is doped with ZrO2 / SiO2 particles to form a reflective radiation type cooling material. The preparation method comprises the following steps: adding PDMS into an n-hexane solution, and magnetically stirring to form a uniform solution; zrO2 / SiO2 particles in different proportions are added into the solution, and are magnetically stirred to be uniformly dispersed to obtain a white solution; and coating the surfaces of an acrylic sheet, a metal substrate and building concrete with the solution, forming a flat coating by using a scraper or a brush through a blade coating method, and finally airing the sample. The material price is low, the preparation method is simple, and the cooling coating has wide application prospects in the fields of prefabricated buildings and metal framework structure buildings.

Description

Technical Field

[0001] The present invention provides a method for preparing a reflective radiation type cooling coating for assembling the wall of an electric power facility, which belongs to the field of materials and energy, and mainly involves the thermal management problem of buildings. The method effectively reduces the sub-ambient temperature by increasing the reflective and radiative heat dissipation function of the coating. Background Art

[0002] The control of heat and cold in buildings is an important topic that needs to be considered in pursuit of a comfortable life. Especially for summer cooling, currently, the common cooling methods include: vapor compression cooling, absorption cooling and commercial air conditioning cooling. Although the effect is remarkable, they consume a lot of energy, which will also bring serious environmental pollution problems. Radiative cooling is a zero-energy technology that passively dissipates the heat of the earth to outer space through thermal radiation through radiative cooling materials. Thermal radiation is dissipated to outer space through the transparent window of the atmosphere (8-13μm), and the temperature of outer space is about 2.7K, which is considered an ideal radiator. In the past ten years, nighttime radiative cooling has been widely studied, and its applicability has been well verified. Considering that the cooling demand is usually during the day, daytime cooling is more meaningful and more challenging. The requirement for the radiative cooler is to select emission only at the atmospheric window and suppress absorption or emission outside this band. A good design or material can achieve a satisfactory sub-ambient cooling effect, and the net cooling power can reach 100W / m in clear and cloudless weather. 2 Therefore, radiative cooling may become a very promising cooling technology in the fields of architecture, solar cells, and space construction. Summary of the invention

[0003] A method for preparing a reflective radiation cooling coating for assembling the wall of a power facility. The cooling coating is prepared by calculating the ratio of PDMS and ZrO2 / SiO2 particles and using a scraping method to prepare a sample. The sample exhibits a reflectivity of 93.55% (0.3-1.35μm) and an emissivity of 92.25% (3-25μm). The cooling coating achieves a maximum average temperature drop of 9.8°C during the day, which is 4.4°C lower than commercial white paint (Guangdong Sanhe Chemical, color number: 40), and an average temperature drop of 2.9°C at night. Finally, a simulated house experiment was conducted, and the results showed that the average temperature drop of the sample was 4.2°C compared with the commercial white paint. Because the invented material is inexpensive and the preparation method is simple, the cooling coating has broad application prospects in building refrigeration.

[0004] A method for preparing a reflective radiation type cooling coating for assembling the wall of an electric power facility. The specific preparation steps are as follows: (1) Preparation of PDMS solution: Add PDMS to n-hexane solution and stir magnetically for 30 minutes to form a homogeneous solution; (2) Preparation of coating stock solution: zirconium dioxide and silicon dioxide are added to the solution of step (1), and then Sylgard 184 silicone rubber curing agent is added, and finally magnetic stirring is performed for 3 hours to make it evenly dispersed to obtain a white solution; (3) Preparation of coating: Apply the white solution in step (2) to the cleaned acrylic sheet, metal substrate and building concrete surface, use a scraper or brush to evenly apply the solution to form a smooth coating, and finally dry the sample to obtain a PDMS cooling coating doped with ZrO2 and SiO2 particles.

[0005] The mass ratio of PDMS, Sylgard 184 silicone rubber curing agent and ZrO2 added in step (2) is 1-4:0.1-0.5:1.

[0006] The added mass ratio of ZrO2 and SiO2 in the step (2) is 0.25-2:1.

[0007] The particle size of ZrO2 in the step (2) is 200-800nm.

[0008] The beneficial effects of the present invention are: The PDMS cooling coating prepared by doping ZrO2 and SiO2 particles effectively improves the radiation capacity of the atmospheric transparent window of PDMS in the mid-infrared light band (8-13um), making the coating have a high reflectivity in the entire solar band: the visible light band (0.3-1.35um), and a high emissivity in the mid- and far-infrared light bands (3-25um). This makes the cooling coating have a good radiation cooling effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 Reflectivity spectra of coatings prepared in Example 1-1, Example 1-2, Example 1-3, Example 1-4 and Example 1-5.

[0010] Figure 2 Reflectivity spectra of coatings prepared in Example 2-1, Example 2-2 and Example 2-3.

[0011] Figure 3 Actual picture of the device for outdoor temperature testing of Example 2-3.

[0012] Figure 4 Schematic diagram of the outdoor temperature test device.

[0013] Figure 5 Daytime temperature comparison curves of Examples 2-3 with sub-ambient and white paint from August 26 to 28, 2020.

[0014] Figure 6Night temperature comparison curves of Examples 2-3 with sub-ambient and white paint from August 26 to 28, 2020.

[0015] Figure 7 Example 2-3 Actual picture of the device for simulating a building outdoors.

[0016] Figure 8 Example 2-3 is a schematic diagram of a device for simulating a building outdoors.

[0017] Fig. 9 Comparison curve of daytime temperature of Example 2-3 with that of the reference group on September 3 and September 5, 2020. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described in conjunction with the embodiments of the present invention.

[0019] Example 1 The present invention conducts experiments on cooling coatings doped with ZrO2 particles of different particle sizes, and the specific experimental methods are as follows: Example 1-1 The specific preparation steps of the cooling coating are as follows: (1) Preparation of PDMS solution: Add PDMS to n-hexane solution and stir magnetically for 30 minutes to form a homogeneous solution; (2) Preparation of coating stock solution: zirconium dioxide and silicon dioxide with a particle size of 200 nm were added to the solution of step (1) at a mass fraction ratio of 1:1, and then Sylgard 184 silicone rubber curing agent was added. Finally, magnetic stirring was performed for 3 hours to make it evenly dispersed to obtain a white solution; (3) Preparation of coating: Apply the white solution in step (2) to the cleaned acrylic sheet, metal substrate and building concrete surface, use a scraper or brush to evenly apply the solution to form a smooth coating, and finally dry the sample to obtain a PDMS cooling coating doped with ZrO2 and SiO2 particles.

[0020] Example 1-2 Compared with Example 1-1, except that the ZrO2 particle size is 400nm, the rest is the same as Example 1-1.

[0021] Examples 1-3 Compared with Example 1-1, except that the ZrO2 particle size is 500nm, the rest is the same as Example 1-1.

[0022] Examples 1-4 Compared with Example 1-1, except that the ZrO2 particle size is 600nm, the rest is the same as Example 1-1.

[0023] Examples 1-5 Compared with Example 1-1, except that the ZrO2 particle size is 800nm, the rest is the same as Example 1-1.

[0024] Example 2 The present invention conducts experiments on cooling coatings doped with ZrO2 and SiO2 particles of different mass fractions, and the specific experimental methods are as follows: Example 2-1 The specific preparation steps of the cooling coating are as follows: (1) Preparation of PDMS solution: Add PDMS to n-hexane solution and stir magnetically for 30 minutes to form a homogeneous solution; (2) Preparation of coating stock solution: zirconium dioxide and silicon dioxide with a particle size of 600 nm were added to the solution of step (1) at a mass fraction ratio of 0.25:1, and then Sylgard 184 silicone rubber curing agent was added. Finally, magnetic stirring was performed for 3 hours to make it evenly dispersed to obtain a white solution; (3) Preparation of coating: Apply the white solution in step (2) to the cleaned acrylic sheet, metal substrate and building concrete surface, use a scraper or brush to evenly apply the solution to form a smooth coating, and finally dry the sample to obtain a PDMS cooling coating doped with ZrO2 and SiO2 particles.

[0025] Example 2-2 Compared with Example 2-1, except that the mass fraction ratio of ZrO2 and SiO2 is 0.5:1, the rest is the same as Example 2-1.

[0026] Example 2-3 Compared with Example 2-1, except that the mass fraction ratio of ZrO2 and SiO2 is 1:1, the rest is the same as Example 2-1.

[0027] Embodiment 2-4 Compared with Example 2-1, except that the mass fraction ratio of ZrO2 and SiO2 is 1.5:1, the rest is the same as Example 2-1.

[0028] Embodiment 2-5 Compared with Example 2-1, except that the mass fraction ratio of ZrO2 and SiO2 is 2:1, the rest is the same as Example 2-1.

Claims

1. A method for preparing a reflective radiation type cooling coating for assembling the wall of an electric power facility, characterized in that: The cooling coating is composed of PDMS as a substrate and doped with ZrO2 and SiO2 particles, and includes the following preparation steps: (1) Preparation of PDMS solution: Add PDMS to n-hexane solution and stir magnetically to form a uniform solution; (2) Preparation of coating stock solution: Add zirconium dioxide and silicon dioxide to the solution of step (1), then add Sylgard 184 silicone rubber curing agent, and finally stir magnetically to disperse it evenly to obtain a white solution; (3) Preparation of coating: Apply the white solution in step (2) to the cleaned acrylic sheet, metal substrate and building concrete surface, use a scraper or brush to evenly apply the solution to form a smooth coating, and finally dry the sample to obtain a PDMS cooling coating doped with ZrO2 and SiO2 particles.

2. The method for preparing a reflective radiation type cooling coating for assembling a wall of a power facility according to claim 1, characterized in that: The added mass ratio of PDMS, Sylgard 184 silicone rubber curing agent, and ZrO2 is 1-4:0.1-0.5:

1.

3. The method for preparing a reflective radiation type cooling coating for assembling the wall of a power facility according to claim 1, characterized in that: The added mass ratio of ZrO2 and SiO2 in step (2) is 0.25-2:

1.

4. The method for preparing a reflective radiation type cooling coating for assembling the wall of a power facility according to claim 1, characterized in that: The particle size of ZrO2 in step (2) is 200-800nm.

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