Heat conduction enhanced rare earth-based solar cell heat dissipation backboard material and preparation method thereof

Abstract

The invention provides a heat conduction enhanced rare earth-based solar cell heat dissipation backboard material and a preparation method thereof, and belongs to the field of cells, the cell heat dissipation backboard material comprises the following raw materials by weight: 47-55 parts of PET resin, 40-50 parts of an LCA-PET master batch, 0.3-1 part of an antioxidant, and 0.2-2 parts of a light stabilizer; the LCA-PET master batch is prepared from the following raw materials in parts by weight: 50 to 58 parts of PET resin, 32 to 37 parts of cationic flaky lanthanum cerium oxide, 6 to 10 parts of anionic aluminum nitride and 5 to 8 parts of dispersing agent. According to the heat conduction enhanced type rare earth-based solar cell heat dissipation backboard material, micron-sized flaky lanthanum cerium oxide and nanometer aluminum nitride particles are adopted as raw materials, the flaky morphology of the lanthanum cerium oxide plays a role in improving reflection, and the nanometer aluminum nitride particles play a role in connecting the flaky lanthanum cerium oxide, so that the heat conduction enhanced type rare earth-based solar cell heat dissipation backboard material is obtained. Therefore, the material has high thermal conductivity, high reflection and high emission performance.

Description

Technical Field

[0001] The present invention belongs to the field of batteries, and in particular relates to a thermally conductive enhanced rare earth-based solar cell heat dissipation backboard material and a preparation method thereof. Background Art

[0002] Solar cells are highly sensitive to temperature fluctuations. High temperatures significantly reduce their photoelectric conversion efficiency and lifespan. Existing interlayer cooling technologies suffer from high pressure drop, uneven heat transfer, and high energy consumption. Direct contact heat exchange technologies, on the other hand, require high stability of the cooling medium. Currently, passive cooling relies heavily on the material's high emissivity, but not its thermal conductivity. This makes it difficult for the material's heat to be quickly transferred from the heat source to the heat dissipation surface, thus affecting the heat dissipation rate. Summary of the Invention

[0003] In view of this, the present invention aims to overcome the defects in the prior art and proposes a thermally conductive enhanced rare earth-based solar cell heat dissipation backplane material and a preparation method thereof.

[0004] To achieve the above object, the technical solution of the present invention is achieved as follows: A thermally conductive enhanced rare earth-based solar cell heat dissipation backplane material, comprising the following raw materials in parts by weight: PET resin 47-55 parts, LCA-PET masterbatch 40-50 parts, antioxidant 0.3-1 parts, light stabilizer 0.2-2 parts; The LCA-PET masterbatch comprises the following raw materials in parts by weight: 50-58 parts of PET resin, 32-37 parts of cationic flake lanthanum cerium oxide, 6-10 parts of anionic aluminum nitride, and 5-8 parts of dispersant.

[0005] Furthermore, the cationic flaky lanthanum cerium oxide is prepared by a method comprising the following steps: Step 1 is to disperse flaky lanthanum cerium oxide in deionized water, and obtain a lanthanum cerium oxide dispersion after ultrasonic dispersion; Step 2 is adding an aminosilane coupling agent to anhydrous ethanol and mixing them evenly to obtain a modified diluent; Step 3 is to magnetically stir the lanthanum cerium oxide dispersion, adjust the pH value, dropwise add the modified diluent thereto under heating conditions, continue the reaction after the addition is completed, cool to room temperature after the reaction is completed, and then centrifuge, wash, and vacuum dry to obtain lanthanum cerium amine oxide; Step 4 is to add the amino lanthanum cerium oxide, α-diketone compound and aldehyde compound to glacial acetic acid, place in an ice-water bath, centrifuge, wash and vacuum dry after the reaction to obtain the cationic flaky lanthanum cerium oxide.

[0006] Furthermore, the solid-liquid ratio of the flaky lanthanum cerium oxide to deionized water in step 1 is 5 g:100-300 mL; the solid-liquid ratio of the aminosilane coupling agent to anhydrous ethanol in step 2 is 5 g:50-100 mL; the volume ratio of the lanthanum cerium oxide dispersion to the modified diluent in step 3 is 1:0.25-0.5; the flaky lanthanum cerium oxide is micron-sized, with a radial size of 20-50 μm and a thickness of 200-500 nm, wherein the molar ratio of La / Ce is 0.02-0.08.

[0007] Furthermore, the pH value of the pH adjustment step in step 3 is 4-6; the temperature of the heating step in step 3 is 50-100°C; the temperature of the vacuum drying step in step 3 is 60-100°C; and deionized water is used in the washing step in step 3.

[0008] Furthermore, the molar ratio of the amino lanthanum cerium oxide, the α-diketone compound and the aldehyde compound in step 4 is 0.1-0.2:1:1; the α-diketone compound is at least one of butanedione, 2,3-pentanedione or 2,3-hexanedione; and the aldehyde compound is at least one of propionaldehyde, n-butyraldehyde or isobutyraldehyde.

[0009] Furthermore, the reaction time in step 4 is 10-15 hours; the temperature of the vacuum drying step in step 4 is 60-100° C.; and ethanol is used in the washing step in step 4.

[0010] Furthermore, the anionic aluminum nitride is prepared by a method comprising the following steps: Aluminum nitride and isopropylidene acrylate are added to a solvent, heated under reflux, separated, washed, and dried at low temperature after the reaction is completed to obtain the anionic aluminum nitride, wherein the solvent is one of ethyl acetate, butyl acetate, toluene, and xylene.

[0011] Furthermore, the solid-liquid ratio of the aluminum nitride, isopropyl acrylate, and solvent is 1 g:8-12 g:40-100 mL; the aluminum nitride is nanoscale with a particle size of 20-80 nm; the solvent is at least one of ethyl acetate, butyl acetate, or xylene; and the temperature of the heating and reflux step is 75-100° C., and the time is 8-12 hours.

[0012] Flake lanthanum cerium oxide inherently possesses high reflectivity and high emissivity. When laid flat in a resin, its reflectivity is further enhanced. However, its thermal conductivity is inferior to that of some specialized high-conductivity materials. Therefore, aluminum nitride was introduced with a controlled, small particle size to prevent the flat structure of the flake material from interfering with the material's properties. This also contributes to the construction of a thermal conductivity pathway, further improving the material's thermal conductivity. To enhance the interaction between the two fillers, cationic groups were introduced to the surface of the lanthanum cerium oxide flakes, and anionic groups were introduced to the surface of the aluminum nitride, creating an electrostatic attraction between the two and strengthening the bond.

[0013] Furthermore, the aminosilane coupling agent is at least one of KH550, KH540, KH902 or KH554; The antioxidant is at least one of PIANOX-1010, Irgafos 1010, AT-626 or PW-9225B; The light stabilizer is at least one of RIASORB UV-292, Tinuvin 326, Xinyi Synthesis 3638 or CYASORB UV2908; The dispersant is at least one of AC540A, Licocare RBW 102 Vita, Licolub WE 40 or UNIQSPERSE 610S.

[0014] The method for preparing the thermally conductive enhanced rare earth-based solar cell heat dissipation backplane material comprises the following steps: Step 1 is to blend PET resin, cationic flaky lanthanum cerium oxide, anionic aluminum nitride and a dispersant to form a blend, and then add the blend to perform melt extrusion and granulation to obtain an LCA-PET masterbatch; Step 2 is to melt-blend, extrude, and cool the PET resin, LCA-PET masterbatch, antioxidant, and light stabilizer to obtain a PET composite material; Step 3 is to adhere PVDF films to the front and back of the PET composite material to obtain the thermally conductive enhanced rare earth-based solar cell heat dissipation backboard material; The zone temperatures of the twin-screw extruder in the melt extrusion step in step 1 are 230-240°C for the conveying section, 245-255°C for the melting section, 245-255°C for the mixing section, 260-270°C for the exhaust section, 260-270°C for the homogenizing section, 260-270°C for the die temperature, and a feed rate of 230-270 g / min; The thickness of the PET composite material is 250-450 μm.

[0015] Compared with the prior art, the present invention has the following advantages: The thermally conductive enhanced rare earth-based solar cell heat dissipation backplane material described in the present invention uses micron-sized flaky lanthanum cerium oxide and nano-aluminum nitride particles as raw materials. The flaky morphology of lanthanum cerium oxide improves reflection, and the material itself also has high emissivity. The nano-aluminum nitride particles connect the flaky lanthanum cerium oxide to form a thermal conduction path, so that the material has high thermal conductivity, high reflection and high emissivity. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a temperature rise curve of the solar cell heat dissipation backplate according to an embodiment of the present invention. DETAILED DESCRIPTION

[0017] Unless otherwise defined, the technical terms used in the following examples have the same meanings as commonly understood by those skilled in the art to which this invention belongs. The experimental reagents used in the following examples, unless otherwise specified, are conventional biochemical reagents; the experimental methods described, unless otherwise specified, are conventional methods.

[0018] The present invention will be described in detail below with reference to the embodiments.

[0019] Example 1 A method for preparing a thermally conductive enhanced rare earth-based solar cell heat dissipation backplane material comprises the following steps: (1) Preparation of cationic flaky lanthanum cerium oxide: Weigh 5g of flaky lanthanum cerium oxide (particle size D 50 =50μm, La / Ce molar ratio =0.06) was dispersed in 200mL deionized water, ultrasonically dispersed for 30min to obtain a dispersion, 5gKH550 was added to 50mL anhydrous ethanol to form a modified diluent, the dispersion was poured into a flask, magnetically stirred, and hydrochloric acid was added to adjust the pH to 5. The reaction temperature was 60°C. After the temperature stabilized, the modified diluent was slowly added dropwise to the system. After the addition was completed, the reaction was continued for 12h. After the reaction was completed, the system was cooled to room temperature and then centrifuged. It was washed with deionized water 5 times or more, and then vacuum dried at 60°C overnight to obtain amino lanthanum cerium oxide. 21.5g amino lanthanum cerium oxide, 86g diacetyl, and 58g propionaldehyde were added to 100mL glacial acetic acid and placed in an ice-water bath. The reaction time was 15h. After the reaction, the system was centrifuged at high speed and washed with ethanol multiple times. It was vacuum dried at 60°C overnight to obtain cationic flake lanthanum cerium oxide; (2) Preparation of anionic aluminum nitride: Weigh 5 g of aluminum nitride (particle size 50 nm) and mix with 60 g of isopropyl acrylate, add 450 mL of ethyl acetate, and reflux at 80°C for 12 h. After the reaction is complete, separate, wash, and dry at low temperature to obtain anionic aluminum nitride. (3) Preparation of LCA-PET masterbatch: 52 parts of PET resin, 34 parts of cationic flaky lanthanum cerium oxide, 7 parts of anionic aluminum nitride, and 7 parts of dispersant AC540A were poured into a high-speed mixer and blended to form a blend, which was then added to a twin-screw extruder for melt extrusion and granulation to obtain an LCA-PET masterbatch. The temperatures of the twin-screw extruder zones were 230, 250, 250, 265, and 265°C, the die temperature was 265°C, and the feed rate was 240 g / min. (4) 50 parts of PET resin, 48 parts of LCA-PET masterbatch, 0.8 parts of antioxidant PIANOX-1010, and 1.2 parts of light stabilizer RIASORB UV-292 were melt-blended, fed into an extruder, and cast on a cold drum for rapid cooling to form a 300 μm thick PET composite film layer; (5) Glue is applied to both sides of the PET composite material with a coating thickness of 10 μm, and then PVDF film (commercially available) is directly laminated on both sides of the PET.

[0020] Example 2 A method for preparing a thermally conductive enhanced rare earth-based solar cell heat dissipation backplane material comprises the following steps: (1) Preparation of cationic flaky lanthanum cerium oxide: Weigh 5g of flaky lanthanum cerium oxide (particle size D 50 =50μm, La / Ce molar ratio =0.03) was dispersed in 250mL deionized water, ultrasonically dispersed for 30min to obtain a dispersion, 5g of aminosilane coupling agent KH540 was added to 75mL of anhydrous ethanol, the dispersion was poured into a flask, magnetically stirred, and hydrochloric acid was added to adjust the pH to 6. The reaction temperature was 80°C. After the temperature stabilized, the modified diluent was slowly added dropwise to the system. After the addition was completed, the reaction was continued for 8h. After the reaction was completed, the system was cooled to room temperature and then centrifuged. It was washed with deionized water 5 times or more and then vacuum dried at 80°C overnight to obtain lanthanum cerium amine oxide. 26g of lanthanum cerium amine oxide, 100g of 2,3-pentanedione, and 72g of n-butyraldehyde were added to 100mL of glacial acetic acid and placed in an ice-water bath. The reaction time was 10h. After the reaction, the system was centrifuged at high speed and washed with ethanol multiple times. It was vacuum dried at 100°C overnight to obtain cationic flaky lanthanum cerium oxide; (2) Preparation of anionic aluminum nitride: 5 g of aluminum nitride (particle size 80 nm) was weighed and mixed with 40 g of isopropyl acrylate, 300 mL of xylene was added, and the mixture was refluxed at 95°C for 9 h. After the reaction was completed, the mixture was separated, washed, and dried at low temperature to obtain anionic aluminum nitride. (3) Preparation of LCA-PET masterbatch: 56 parts of PET resin, 32 parts of cationic flaky lanthanum cerium oxide, 6 parts of anionic aluminum nitride, and 6 parts of dispersant Licocare RBW 102 Vita were poured into a high-speed mixer and blended to form a blend, which was then added to a twin-screw extruder for melt extrusion and granulation to obtain an LCA-PET masterbatch. The temperatures of the twin-screw extruder zones were 240, 255, 255, 270, and 270° C., the die temperature was 270° C., and the feed rate was 260 g / min. (4) 54 parts of PET resin, 43.5 parts of LCA-PET masterbatch, 1 part of antioxidant AT-626, and 1.5 parts of light stabilizer Tinuvin 326 were melt-blended, fed into an extruder, and cast on a cold drum for rapid cooling to form a 300 μm thick PET composite film layer; (5) Glue is applied to both sides of the PET composite material with a coating thickness of 10 μm, and then PVDF film (commercially available) is directly laminated on both sides of the PET.

[0021] Comparative Example 1 A method for preparing a solar cell heat dissipation backboard material comprises the following steps: (1) Preparation of anionic aluminum nitride: 5 g of aluminum nitride (particle size 80 nm) was weighed and mixed with 40 g of isopropyl acrylate, 300 mL of xylene was added, and the mixture was refluxed at 95°C for 9 h. After the reaction was completed, the mixture was separated, washed, and dried at low temperature to obtain anionic aluminum nitride. (2) Preparation of LCA-PET masterbatch: 56 parts of PET resin, 6 parts of anionic aluminum nitride, and 6 parts of dispersant Licocare RBW 102 Vita were poured into a high-speed mixer and blended to form a blend, which was then added to a twin-screw extruder for melt extrusion and granulation to obtain an LCA-PET masterbatch. The temperatures of the twin-screw extruder zones were 240, 255, 255, 270, and 270°C, the die temperature was 270°C, and the feed rate was 260 g / min. (3) 54 parts of PET resin, 43.5 parts of LCA-PET masterbatch, 1 part of antioxidant AT-626, and 1.5 parts of light stabilizer Tinuvin326 were melt-blended, fed into an extruder, and cast on a cold drum for rapid cooling to form a 300 μm thick PET composite film layer; (4) Glue is applied to both sides of the PET composite material with a coating thickness of 10 μm, and then PVDF film (commercially available) is directly laminated on both sides of the PET.

[0022] Comparative Example 2 A method for preparing a rare earth-based solar cell heat dissipation backplane material comprises the following steps: (1) Preparation of cationic lanthanum cerium oxide: Weigh 5g of cerium lanthanum oxide without special morphology (particle size D 50 = 50 μm, La / Ce molar ratio = 0.03) were dispersed in 250 mL of deionized water and ultrasonically dispersed for 30 min to obtain a dispersion. 5 g of Aminosilane coupling agent KH540 is used to form a modified diluent. The dispersion is poured into a flask and stirred magnetically. Hydrochloric acid is added to adjust the pH to 6. The reaction temperature is 80°C. After the temperature stabilizes, the modified diluent is slowly added dropwise to the system. After the addition is completed, the reaction is continued for 8 hours. After the reaction is completed, the system is cooled to room temperature and then centrifuged. It is washed with deionized water 5 times or more, and then vacuum-dried at 80°C overnight to obtain amino lanthanum cerium oxide. 26g of amino lanthanum cerium oxide, 100g of 2,3-pentanedione, and 72g of n-butyraldehyde are added to 100mL of glacial acetic acid and placed in an ice-water bath. The reaction time is 10h. After the reaction, the system is centrifuged at high speed and washed with ethanol multiple times. It is vacuum-dried at 100°C overnight to obtain cationic flaky lanthanum cerium oxide; (2) Preparation of anionic aluminum nitride: 5 g of aluminum nitride (particle size 80 nm) was weighed and mixed with 40 g of isopropyl acrylate, 300 mL of xylene was added, and the mixture was refluxed at 95°C for 9 h. After the reaction was completed, the mixture was separated, washed, and dried at low temperature to obtain anionic aluminum nitride. (3) Preparation of LCA-PET masterbatch: 56 parts of PET resin, 32 parts of cationic flaky lanthanum cerium oxide, 6 parts of anionic aluminum nitride, and 6 parts of dispersant Licocare RBW 102 Vita were poured into a high-speed mixer and blended to form a blend, which was then added to a twin-screw extruder for melt extrusion and granulation to obtain an LCA-PET masterbatch. The temperatures of the twin-screw extruder zones were 240, 255, 255, 270, and 270° C., the die temperature was 270° C., and the feed rate was 260 g / min. (4) 54 parts of PET resin, 43.5 parts of LCA-PET masterbatch, 1 part of antioxidant AT-626, and 1.5 parts of light stabilizer Tinuvin 326 were melt-blended, fed into an extruder, and cast on a cold drum for rapid cooling to form a 300 μm thick PET composite film layer; (5) Glue is applied to both sides of the PET composite material with a coating thickness of 10 μm, and then PVDF film (commercially available) is directly laminated on both sides of the PET.

[0023] Comparative Example 3 A method for preparing a rare earth-based solar cell heat dissipation backplane material comprises the following steps: (1) Preparation of cationic flaky lanthanum cerium oxide: Weigh 5g of flaky lanthanum cerium oxide (particle size D 50 =50μm, La / Ce molar ratio =0.03) was dispersed in 250mL deionized water, ultrasonically dispersed for 30min to obtain a dispersion, 5g KH540 was added to 75mL anhydrous ethanol to form a modified diluent, the dispersion was poured into a flask, magnetically stirred, and hydrochloric acid was added to adjust the pH to 6. The reaction temperature was 80°C. After the temperature stabilized, the modified diluent was slowly added dropwise to the system. After the addition was completed, the reaction was continued for 8h. After the reaction was completed, the system was cooled to room temperature and then centrifuged. It was washed with deionized water 5 times or more, and then vacuum dried at 80°C overnight to obtain lanthanum cerium amine oxide. 26g lanthanum cerium amine oxide, 100g 2,3-pentanedione, and 72g n-butyraldehyde were added to 100mL glacial acetic acid and placed in an ice-water bath. The reaction time was 10h. After the reaction, the system was high-speed centrifuged and washed with ethanol multiple times. It was vacuum dried at 100°C overnight to obtain cationic flaky lanthanum cerium oxide; (2) Preparation of LCA-PET masterbatch: 56 parts of PET resin, 32 parts of cationic flaky lanthanum cerium oxide, and 6 parts of dispersant Licocare RBW102Vita were poured into a high-speed mixer and blended to form a blend, which was then added to a twin-screw extruder for melt extrusion and granulation to obtain an LCA-PET masterbatch. The temperatures of the twin-screw extruder zones were 240, 255, 255, 270, and 270°C, the die temperature was 270°C, and the feed rate was 260 g / min. (3) 54 parts of PET resin, 43.5 parts of LCA-PET masterbatch, 1 part of antioxidant AT-626, and 1.5 parts of light stabilizer Tinuvin326 were melt-blended, fed into an extruder, and cast on a cold drum for rapid cooling to form a 300 μm thick PET composite film layer; (4) Glue is applied to both sides of the PET composite material with a coating thickness of 10 μm, and then PVDF film (commercially available) is directly laminated on both sides of the PET.

[0024] Comparative Example 4 A method for preparing a rare earth-based solar cell heat dissipation backplane material comprises the following steps: (1) Preparation of LCA-PET masterbatch: 56 parts of PET resin, 32 parts of flaky lanthanum cerium oxide (La / Ce molar ratio = 0.03), 6 parts of aluminum nitride, and 6 parts of dispersant Licocare RBW 102 Vita were poured into a high-speed mixer and blended to form a blend, which was then added to a twin-screw extruder for melt extrusion and pelletization to obtain an LCA-PET masterbatch. The temperatures of the twin-screw extruder zones were 240, 255, 255, 270, and 270°C, the die temperature was 270°C, and the feed rate was 260 g / min. (2) 54 parts of PET resin, 43.5 parts of LCA-PET masterbatch, 1 part of antioxidant AT-626, and 1.5 parts of light stabilizer Tinuvin326 were melt-blended, fed into an extruder, and cast on a cold drum for rapid cooling to form a 300 μm thick PET composite film layer; (3) Glue is applied to both sides of the PET composite material with a coating thickness of 10 μm, and then PVDF film (commercially available) is directly laminated on both sides of the PET.

[0025] The thermal conductivity and emissivity of Examples 1-2 and Comparative Examples 1-4 provided by the present invention were measured, and the results are shown in Table 1.

[0026] Table 1 Emissivity data

[0027] As shown in Table 1, the thermal conductivity coefficients of the thermally conductive enhanced rare earth-based solar cell heat dissipation backsheets provided in Examples 1-2 of the present invention are all around 1.6 W / mK, the reflectivity is above 93%, and the emissivity is above 95%.

[0028] Compared with Example 2, Comparative Example 1 removes the filler lanthanum cerium oxide, and its thermal conductivity, reflectivity and emissivity are significantly reduced, indicating that lanthanum cerium oxide is responsible for these three aspects of performance in the backplane material. Compared with Example 2, Comparative Example 2 replaces the flaky lanthanum cerium oxide with lanthanum cerium oxide without special morphology, and its reflectivity is reduced by 12%, and its thermal conductivity is reduced by 0.55W / mK, indicating that the flaky morphology of lanthanum cerium oxide not only improves the reflective performance of the material, but also helps to build a thermal conductive path. Compared with Example 2, Comparative Example 3 removes the filler nano-aluminum nitride particles, which significantly reduces the thermal conductivity, indicating that the aluminum nitride particles play a role in enhancing the thermal conductivity of the material. Compared with Example 1, Comparative Example 4 has no anions or cations on the surface of the filler lanthanum cerium oxide and aluminum nitride, and its thermal conductivity is reduced by 0.27W / mK, indicating that anion and cation modification also helps to build a thermal conductive path, mainly by making the two more closely combined.

[0029] The heat dissipation performance of the solar cell heat dissipation backsheet of the present invention is evaluated in outdoor sunlight. The backsheet is placed at the bottom of a small solar cell and the temperature change of the solar cell is recorded in real time. The temperature rise process of the backsheet when the embodiment or the comparative example is respectively as follows: Figure 1 As shown. Examples 1-2 all have lower surface temperatures under outdoor conditions, and can reduce the surface temperature by about 10°C compared to Comparative Example 1. Comparative Examples 2-4 can also reduce the temperature by 3-5°C, but the cooling effect is far less than that of Examples 1-2, indicating that the thermally conductive enhanced rare earth-based solar cell heat dissipation backplane of the present invention has excellent heat dissipation effect.

[0030] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A thermally conductive enhanced rare earth-based solar cell heat dissipation backplane material, characterized by: The battery heat dissipation back plate material includes the following raw materials in parts by weight: PET resin 47-55 parts, LCA-PET masterbatch 40-50 parts, antioxidant 0.3-1 parts, light stabilizer 0.2-2 parts; The LCA-PET masterbatch comprises the following raw materials in parts by weight: 50-58 parts of PET resin, 32-37 parts of cationic flake lanthanum cerium oxide, 6-10 parts of anionic aluminum nitride, and 5-8 parts of dispersant.

2. The thermally conductive enhanced rare earth-based solar cell heat dissipation backplane material according to claim 1, characterized in that: The cationic flaky lanthanum cerium oxide is prepared by a method comprising the following steps: Step 1 is to disperse flaky lanthanum cerium oxide in deionized water, and obtain a lanthanum cerium oxide dispersion after ultrasonic dispersion; Step 2 is adding an aminosilane coupling agent to anhydrous ethanol and mixing them evenly to obtain a modified diluent; Step 3 is to magnetically stir the lanthanum cerium oxide dispersion, adjust the pH value, dropwise add the modified diluent thereto under heating conditions, continue the reaction after the addition is completed, cool to room temperature after the reaction is completed, and then centrifuge, wash, and vacuum dry to obtain lanthanum cerium amine oxide; Step 4 is to add the amino lanthanum cerium oxide, α-diketone compound and aldehyde compound to glacial acetic acid, place in an ice-water bath, centrifuge, wash and vacuum dry after the reaction to obtain the cationic flaky lanthanum cerium oxide.

3. The thermally conductive enhanced rare earth-based solar cell heat dissipation backplane material according to claim 2, characterized in that: The solid-liquid ratio of the flaky lanthanum cerium oxide to deionized water in step 1 is 5 g:100-300 mL; the solid-liquid ratio of the aminosilane coupling agent to anhydrous ethanol in step 2 is 5 g:50-100 mL; the volume ratio of the lanthanum cerium oxide dispersion to the modified diluent in step 3 is 1:0.25-0.5; the flaky lanthanum cerium oxide is micron-sized, with a radial size of 20-50 μm and a thickness of 200-500 nm, wherein the molar ratio of La to Ce is 0.02-0.

08.

4. The thermally conductive enhanced rare earth-based solar cell heat dissipation backplane material according to claim 2, characterized in that: The pH value of the pH adjustment step in step 3 is 4-6; the temperature of the heating step in step 3 is 50-100° C.; the temperature of the vacuum drying step in step 3 is 60-100° C.; and deionized water is used in the washing step in step 3.

5. The thermally conductive enhanced rare earth-based solar cell heat dissipation backplane material according to claim 2, characterized in that: The molar ratio of the cerium lanthanum oxyamide, the α-diketone compound and the aldehyde compound in step 4 is 0.1-0.2:1:1; the α-diketone compound is at least one of diacetyl, 2,3-pentanedione or 2,3-hexanedione; and the aldehyde compound is at least one of propionaldehyde, n-butyraldehyde or isobutyraldehyde.

6. The thermally conductive enhanced rare earth-based solar cell heat dissipation backplane material according to claim 2, characterized in that: The reaction time in step 4 is 10-15 hours; the temperature of the vacuum drying step in step 4 is 60-100° C.; and ethanol is used in the washing step in step 4.

7. The thermally conductive enhanced rare earth-based solar cell heat dissipation backplane material according to claim 1, characterized in that: The anionic aluminum nitride is prepared by a method comprising the following steps: Aluminum nitride and isopropylidene acrylate are added to a solvent, heated under reflux, separated, washed, and dried at low temperature after the reaction is completed to obtain the anionic aluminum nitride, wherein the solvent is one of ethyl acetate, butyl acetate, toluene and xylene.

8. The thermally conductive enhanced rare earth-based solar cell heat dissipation backplane material according to claim 7, characterized in that: The solid-liquid ratio of the aluminum nitride, isopropyl acrylate and solvent is 1g:8-12g:40-100mL; the aluminum nitride is nanometer-sized with a particle size of 20-80nm; the solvent is at least one of ethyl acetate, butyl acetate or xylene; the temperature of the heating and reflux step is 75-100°C, and the time is 8-12 hours.

9. The thermally conductive enhanced rare earth-based solar cell heat dissipation backplane material according to claim 2, characterized in that: The aminosilane coupling agent is at least one of KH550, KH540, KH902 or KH554; The antioxidant is at least one of PIANOX-1010, Irgafos 1010, AT-626 or PW-9225B; The light stabilizer is at least one of RIASORB UV-292, Tinuvin 326, Xinyi Synthesis 3638 or CYASORB UV2908; The dispersant is at least one of AC540A, Licocare RBW 102 Vita, Licolub WE 40 or UNIQSPERSE 610S.

10. The method for preparing the thermally conductive enhanced rare earth-based solar cell heat dissipation backplane material according to any one of claims 1 to 9, characterized in that: The steps include: Step 1 is to blend PET resin, cationic flaky lanthanum cerium oxide, anionic aluminum nitride and a dispersant to form a blend, and then add the blend to perform melt extrusion and granulation to obtain an LCA-PET masterbatch; Step 2 is to melt-blend, extrude, and cool the PET resin, LCA-PET masterbatch, antioxidant, and light stabilizer to obtain a PET composite material; Step 3 is to adhere PVDF films to the front and back of the PET composite material to obtain the thermally conductive enhanced rare earth-based solar cell heat dissipation backboard material; The zone temperatures of the twin-screw extruder in the melt extrusion step in step 1 are 230-240°C for the conveying section, 245-255°C for the melting section, 245-255°C for the mixing section, 260-270°C for the exhaust section, 260-270°C for the homogenizing section, 260-270°C for the die temperature, and a feed rate of 230-270 g / min; The thickness of the PET composite material is 250-450 μm.

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