Application of a Coating Material in the Photovoltaic Field

Abstract

The present invention discloses the application of a coating material in the photovoltaic field. The aluminum nitride / ceria / PVDF-HFP composite coating prepared by the present invention has excellent heat dissipation performance. Moreover, the effect is good when two kinds of heat-conducting fillers (aluminum nitride / ceria) are used in combination. In a preferred embodiment, the heat dissipation performance of the composite coating can even be comparable to that of a heat dissipation coating filled with graphene, and it has an obvious cost advantage, and can be popularized and applied in the industry.

Description

Technical Field

[0001] The present invention relates to the field of coatings, and specifically to the application of a coating material in the photovoltaic field. Background Art

[0002] Photovoltaic power generation is one of the important ways to achieve the goal of carbon neutrality. Solar power generation by the photovoltaic effect uses solar cells to absorb sunlight with a wavelength of 0.4 - 1.1 μm and convert light energy into electrical energy for output.

[0003] However, if most of the absorbed heat cannot be discharged in time during the process of photovoltaic power generation, it will cause the temperature of the photovoltaic module to rise, which will further pose a threat to its power generation efficiency, service life, etc. In response to this problem, the prior art (Preparation and Performance Research of a Graphene / PVDF-HFP Composite Heat Dissipation Coating, written by Zheng Yuqin) designed a graphene / PVDF-HFP composite heat dissipation coating. However, graphene is expensive and difficult to be widely used in the industry. In view of this, the present invention hopes to obtain a heat dissipation coating with low cost for application in the photovoltaic field. Summary of the Invention

[0004] The purpose of the present invention is to provide the application of a coating material in the photovoltaic field. This coating has excellent heat dissipation performance and the advantage of low cost.

[0005] The technical solution of the present invention is as follows:

[0006] The application of a coating material in the photovoltaic field, and the preparation method of the coating material includes the following steps:

[0007] Substrate pretreatment: Select stainless steel with a size of 100mm×100mm as the substrate, and polish it successively with sandpapers of 100, 400, 1200, and 2000 meshes, perform pickling treatment with a 15 - 18wt% hydrochloric acid solution, perform degreasing treatment with a 20 - 25wt% sodium bicarbonate solution, remove the residual liquid on the surface with absolute ethanol, and dry it for later use;

[0008] Prepare the coating solution: Take 100 - 120g of PVDF-HFP powder and add it to 500 - 600g of DMF solution, stir magnetically at 55 - 60°C for 45 - 60min to obtain a transparent precursor; add 45 - 50g of acrylic resin to the transparent precursor, and stir magnetically at room temperature for 45 - 60min; continue to add 0.5 - 3.2g of aluminum nitride powder with an average particle size of 200 - 400nm and 0.5 - 3.2g of cerium dioxide powder, stir magnetically at room temperature for 150 - 180min, and let it stand for 4 - 6h to obtain a viscous coating solution;

[0009] Preparation of composite coating: The coating solution was coated on the surface of the pretreated substrate and dried in a vacuum drying oven to finally obtain a heat dissipation coating for photovoltaic modules. By controlling the coating amount or coating times of the coating solution, the thickness of the composite coating was 50 - 100 μm.

[0010] Preferably, the concentration of the hydrochloric acid solution is 15 wt%.

[0011] Preferably, the concentration of the sodium bicarbonate solution is 25 wt%.

[0012] Preferably, the mass of the PVDF - HFP powder is 100 g.

[0013] Preferably, the mass of the DMF solution is 500 g.

[0014] Preferably, the thickness of the composite coating is 50 μm.

[0015] Preferably, the mass of the aluminum nitride powder is 0.9 g.

[0016] Preferably, the mass of the cerium dioxide powder is 1.2 g.

[0017] The aluminum nitride / cerium dioxide / PVDF - HFP (polyvinylidene fluoride - hexafluoropropylene copolymer) composite coating prepared by the present invention has excellent heat dissipation performance. Moreover, the effect is good when two thermal conductive fillers (aluminum nitride / cerium dioxide) are used in combination. In the preferred embodiment, the heat dissipation performance of the composite coating can even be comparable to that of the heat dissipation coating filled with graphene, and it has an obvious cost advantage, which can be popularized and applied in the industry. Specific embodiments

[0018] The technical effects of the present invention are verified by specific examples below, but the embodiments of the present invention are not limited thereto.

[0019] Example 1

[0020] Substrate pretreatment: Stainless steel with a size of 100 mm × 100 mm was selected as the substrate, and it was polished successively with sandpapers of 100, 400, 1200, and 2000 meshes, pickled with a 15 wt% hydrochloric acid solution, degreased with a 20 wt% sodium bicarbonate solution, and the residual liquid on the surface was removed with absolute ethanol and dried for use;

[0021] Preparing the coating solution: Add 100 g of PVDF-HFP powder to 500 g of DMF solution, and stir magnetically at 55 °C for 45 min to obtain a transparent precursor; add 45 g of acrylic resin to the transparent precursor, and stir magnetically at room temperature for 45 min; continue to add 0.5 g of aluminum nitride powder with an average particle size of 200 nm and 0.5 g of cerium dioxide powder, and stir magnetically at room temperature for 150 min. After standing for 4 h, a viscous coating solution is obtained;

[0022] Preparing the composite coating: Coat the coating solution on the surface of the pretreated substrate, and dry it in a vacuum drying oven. Finally, a heat dissipation coating for photovoltaic modules is obtained. By controlling the coating amount or the number of coating times of the coating solution, the thickness of the composite coating is 50 μm.

[0023] Example 2

[0024] Substrate pretreatment: Select stainless steel with a size of 100 mm × 100 mm as the substrate, and polish it successively with sandpapers of 100, 400, 1200, and 2000 meshes, perform pickling treatment with 15 wt% hydrochloric acid solution, perform degreasing treatment with 20 wt% sodium bicarbonate solution, remove the residual liquid on the surface with absolute ethanol, and dry it for later use;

[0025] Preparing the coating solution: Add 100 g of PVDF-HFP powder to 500 g of DMF solution, and stir magnetically at 55 °C for 45 min to obtain a transparent precursor; add 45 g of acrylic resin to the transparent precursor, and stir magnetically at room temperature for 45 min; continue to add 1.2 g of aluminum nitride powder with an average particle size of 200 nm and 0.9 g of cerium dioxide powder, and stir magnetically at room temperature for 150 min. After standing for 4 h, a viscous coating solution is obtained;

[0026] Preparing the composite coating: Coat the coating solution on the surface of the pretreated substrate, and dry it in a vacuum drying oven. Finally, a heat dissipation coating for photovoltaic modules is obtained. By controlling the coating amount or the number of coating times of the coating solution, the thickness of the composite coating is 50 μm.

[0027] Example 3

[0028] Substrate pretreatment: Select stainless steel with a size of 100 mm × 100 mm as the substrate, and polish it successively with sandpapers of 100, 400, 1200, and 2000 meshes, perform pickling treatment with 15 wt% hydrochloric acid solution, perform degreasing treatment with 20 wt% sodium bicarbonate solution, remove the residual liquid on the surface with absolute ethanol, and dry it for later use;

[0029] Preparing the coating solution: Add 100 g of PVDF-HFP powder into 500 g of DMF solution, and stir magnetically at 55 °C for 45 min to obtain a transparent precursor; add 45 g of acrylic resin to the transparent precursor, and stir magnetically at room temperature for 45 min; continue to add 0.9 g of aluminum nitride powder with an average particle size of 200 nm and 1.2 g of cerium dioxide powder, and stir magnetically at room temperature for 150 min. After standing for 4 h, a viscous coating solution is obtained.

[0030] Preparing the composite coating: Coating the coating solution on the surface of the pretreated substrate, and drying it in a vacuum drying oven. Finally, a heat dissipation coating for photovoltaic modules is obtained. By controlling the coating amount or coating times of the coating solution, the thickness of the composite coating is 50 μm.

[0031] Example 4

[0032] Substrate pretreatment: Select stainless steel with a size of 100 mm × 100 mm as the substrate, and polish it successively with sandpapers of 100, 400, 1200, and 2000 meshes, perform pickling treatment with 15 wt% hydrochloric acid solution, perform degreasing treatment with 20 wt% sodium bicarbonate solution, remove the residual liquid on the surface with absolute ethanol, and dry it for later use.

[0033] Preparing the coating solution: Add 100 g of PVDF-HFP powder into 500 g of DMF solution, and stir magnetically at 55 °C for 45 min to obtain a transparent precursor; add 45 g of acrylic resin to the transparent precursor, and stir magnetically at room temperature for 45 min; continue to add 1.8 g of aluminum nitride powder with an average particle size of 200 nm and 1.8 g of cerium dioxide powder, and stir magnetically at room temperature for 150 min. After standing for 4 h, a viscous coating solution is obtained.

[0034] Preparing the composite coating: Coating the coating solution on the surface of the pretreated substrate, and drying it in a vacuum drying oven. Finally, a heat dissipation coating for photovoltaic modules is obtained. By controlling the coating amount or coating times of the coating solution, the thickness of the composite coating is 50 μm.

[0035] Example 5

[0036] Substrate pretreatment: Select stainless steel with a size of 100 mm × 100 mm as the substrate, and polish it successively with sandpapers of 100, 400, 1200, and 2000 meshes, perform pickling treatment with 15 wt% hydrochloric acid solution, perform degreasing treatment with 20 wt% sodium bicarbonate solution, remove the residual liquid on the surface with absolute ethanol, and dry it for later use.

[0037] Preparing the coating solution: Add 100 g of PVDF-HFP powder into 500 g of DMF solution, and stir magnetically at 55 °C for 45 min to obtain a transparent precursor; add 45 g of acrylic resin to the transparent precursor, and stir magnetically at room temperature for 45 min; continue to add 2.5 g of aluminum nitride powder with an average particle size of 200 nm and 2.5 g of cerium dioxide powder, and stir magnetically at room temperature for 150 min. After standing for 4 h, a viscous coating solution is obtained.

[0038] Preparing the composite coating: Coat the coating solution on the surface of the pretreated substrate, and dry it in a vacuum drying oven. Finally, a heat dissipation coating for photovoltaic modules is obtained. By controlling the coating amount or coating times of the coating solution, the thickness of the composite coating is 50 μm.

[0039] Comparative Example 1

[0040] Substrate pretreatment: Select stainless steel with a size of 100 mm × 100 mm as the substrate, polish it successively with sandpapers of 100, 400, 1200, and 2000 meshes, pickle it with a 15 wt% hydrochloric acid solution, degrease it with a 20 wt% sodium bicarbonate solution, remove the residual liquid on the surface with anhydrous ethanol, and dry it for later use.

[0041] Preparing the coating solution: Add 100 g of PVDF-HFP powder into 500 g of DMF solution, and stir magnetically at 55 °C for 45 min to obtain a transparent precursor; add 45 g of acrylic resin to the transparent precursor, and stir magnetically at room temperature for 45 min; continue to add 2.1 g of aluminum nitride powder with an average particle size of 200 nm, and stir magnetically at room temperature for 150 min. After standing for 4 h, a viscous coating solution is obtained.

[0042] Preparing the composite coating: Coat the coating solution on the surface of the pretreated substrate, and dry it in a vacuum drying oven. Finally, a heat dissipation coating for photovoltaic modules is obtained. By controlling the coating amount or coating times of the coating solution, the thickness of the composite coating is 50 μm.

[0043] Comparative Example 2

[0044] Substrate pretreatment: Select stainless steel with a size of 100 mm × 100 mm as the substrate, polish it successively with sandpapers of 100, 400, 1200, and 2000 meshes, pickle it with a 15 wt% hydrochloric acid solution, degrease it with a 20 wt% sodium bicarbonate solution, remove the residual liquid on the surface with anhydrous ethanol, and dry it for later use.

[0045] Preparing the coating solution: Add 100 g of PVDF-HFP powder into 500 g of DMF solution, and magnetically stir for 45 min at 55 °C to obtain a transparent precursor; add 45 g of acrylic resin to the transparent precursor, and magnetically stir for 45 min at room temperature; continue to add 2.1 g of cerium dioxide powder with an average particle size of 200 nm, and magnetically stir for 150 min at room temperature. After standing for 4 h, a viscous coating solution is obtained.

[0046] Preparing the composite coating: Coating the coating solution on the surface of the pretreated substrate, and drying it in a vacuum drying oven. Finally, a heat dissipation coating for photovoltaic modules is obtained. By controlling the coating amount or the number of coating times of the coating solution, the thickness of the composite coating is 50 μm.

[0047] Next, we evaluate the heat dissipation performance of the samples in Examples 1-5 and Comparative Examples 1-2. The heat dissipation performance of the coating is characterized by the thermal diffusivity. The specific method can refer to the prior art mentioned in the background art. The test results are shown in Table 1:

[0048] Table 1 Thermal diffusivity of each sample

[0049] Number <![CDATA[Thermal diffusivity / μm 2 ·s -1 > Example 1 2.31 Example 2 2.47 Example 3 3.02 Example 4 2.71 Example 5 2.55 Comparative Example 1 1.97 Comparative Example 2 1.64

[0050] As can be seen from Table 1, the aluminum nitride / ceria / PVDF-HFP composite coating prepared by the present invention has excellent heat dissipation performance. Moreover, the effect is good when two kinds of thermal conductive fillers (aluminum nitride / ceria) are used in combination. In the preferred embodiment, the heat dissipation performance of the composite coating can even be comparable to that of the heat dissipation coating filled with graphene, and it has an obvious cost advantage, which can be applied and promoted in the industry.

[0051] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. Application of a coating material in the photovoltaic field, characterized in that, The preparation method of the coating material comprises the following steps: Substrate pretreatment: Select stainless steel with a size of 100mm×100mm as the substrate, polish it successively with sandpapers of 100, 400, 1200, and 2000 meshes, perform pickling treatment with a 15-18wt% hydrochloric acid solution, perform degreasing treatment with a 20-25wt% sodium bicarbonate solution, remove the residual liquid on the surface with absolute ethanol, and dry it for later use; Prepare the coating solution: Add 100-120g of PVDF-HFP powder to 500-600g of DMF solution, magnetically stir at 55-60°C for 45-60min to obtain a transparent precursor; add 45-50g of acrylic resin to the transparent precursor, and magnetically stir at room temperature for 45-60min; continue to add 0.5-3.2g of aluminum nitride powder with an average particle size of 200-400nm and 0.5-3.2g of cerium dioxide powder, magnetically stir at room temperature for 150-180min, and let it stand for 4-6h to obtain a viscous coating solution; Prepare the composite coating: Coat the coating solution on the surface of the pretreated substrate, and dry it in a vacuum drying oven to finally obtain a heat dissipation coating for photovoltaic modules. By controlling the coating amount or coating times of the coating solution, the thickness of the composite coating is 50-100μm.

2. Use of a coating material as described in claim 1 in the photovoltaic field, characterized in that, The concentration of the hydrochloric acid solution is 15wt%.

3. Use of a coating material as described in claim 1 in the photovoltaic field, characterized in that, The concentration of the sodium bicarbonate solution is 25wt%.

4. Use of a coating material as described in claim 1 in the field of photovoltaics, characterized in that, The mass of the PVDF-HFP powder is 100g.

5. Use of a coating material as described in claim 1 in the field of photovoltaics, characterized in that, The mass of the DMF solution is 500g.

6. The application of a coating material as described in claim 1 in the photovoltaic field, characterized in that, The thickness of the composite coating is 50μm.

7. Use of a coating material as described in claim 1 in the field of photovoltaics, characterized in that, The mass of the aluminum nitride powder is 0.9g.

8. Use of a coating material as described in claim 1 in the field of photovoltaics, characterized in that, The mass of the cerium dioxide powder is 1.2g.