Ceramic gel phase change energy storage coating and preparation method thereof

Abstract

The invention relates to the technical field of coatings, in particular to a ceramic gel phase change energy storage coating and a preparation method thereof.The ceramic coating and a phase change material are combined to prepare the ceramic gel phase change energy storage coating, and the wear resistance and corrosion resistance of a coating layer can be improved by adding some modified filler; therefore, the durability of the paint coating is improved, and the paint coating has longer service life; secondly, the ceramic coating and the phase-change material are combined, the phase-change material can be used as a filler or a thickening agent, the overall mechanical strength and wear resistance of the coating can be improved, paraffin and expanded graphite can absorb or release a large amount of latent heat when the temperature changes, and due to the combination of the characteristic and the ceramic coating, the mechanical strength and wear resistance of the coating can be improved. The coating can store energy when needed and release the energy at proper time, so that the temperature of the coating and the surrounding environment of the coating is effectively adjusted, the coating has important significance in the fields of building energy conservation, electronic equipment heat management and the like, and the energy consumption can be remarkably reduced and the heat comfort degree can be improved.

Description

Technical Field

[0001] The invention relates to the technical field of coatings, and in particular to a ceramic gel phase-change energy storage coating and a preparation method thereof. Background Art

[0002] With the advancement of science and technology and the growing demand for energy, improving energy efficiency and developing and utilizing renewable energy have become urgent global issues to be solved. Phase change materials are thermal functional materials that can absorb or release latent heat. Unlike thermal insulation materials, phase change materials are not limited to thermal insulation, but can also participate in the storage and utilization of thermal energy, so that phase change materials can produce several times the insulation and heat preservation effects of the same amount of traditional thermal insulation materials. At the same time, through the cycle of high-temperature heat absorption and low-temperature heat release, the temperature is kept close to the required temperature for a long period of time, increasing human comfort. Ceramic materials have been widely used in many fields due to their excellent high temperature resistance, corrosion resistance, high strength and other characteristics.

[0003] In this context, combining phase change materials and ceramic coatings to prepare energy storage coatings can greatly improve the application prospects of coatings. Summary of the invention

[0004] Technical issues solved

[0005] In view of the above-mentioned shortcomings of the prior art, the present invention provides a ceramic gel phase change energy storage coating and a preparation method thereof, which can effectively solve the problem that the ceramic coating of the prior art has no energy storage effect.

[0006] Technical Solution

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0008] A method for preparing a ceramic gel phase change energy storage coating, the preparation method comprising:

[0009] S1. fluorinated graphene oxide is prepared using fluorinated graphene as a raw material, and hollow ceramic microspheres are modified using a silane coupling agent to prepare modified ceramic microspheres;

[0010] S2, weigh 50-55 parts by weight of silica sol, 5-6 parts by weight of mica powder, 6-8 parts by weight of talc and 70-80 parts by weight of deionized water, pour them into a grinder for grinding, and filter the mixture with a 48 μm filter cloth as the grinding component;

[0011] S3, weighing 6-7 parts by weight of fluorinated graphene oxide, 4-5 parts by weight of modified ceramic microbeads, 5-6 parts by weight of silane coupling agent KH-560 and 0.5-0.6 parts by weight of sodium dodecyl sulfate, pouring them into 50 parts by weight of deionized water, and then ultrasonically dispersing them, pouring in the grinding components, stirring and dispersing, and the resultant is recorded as a ceramic coating;

[0012] S4. Prepare a phase change material using paraffin and expanded graphite as raw materials, and then mix and disperse the phase change material and ceramic coating in a weight ratio of 1:5 to obtain a ceramic gel phase change energy storage coating.

[0013] Furthermore, in S1, the preparation method of fluorinated graphene oxide is:

[0014] S2.1, weigh 5-8g of fluorinated graphene and 4-5g of sodium nitrate into 200mL of sulfuric acid solution, stir and react for 90min, then add 15-18g of potassium permanganate solid and continue to react for 10min, the result is recorded as reaction solution;

[0015] S2.2, the reaction solution was placed in a water bath at 30°C for 2 hours, then the water bath temperature was raised to 35°C and the reaction was continued for 1 hour, then 60-80 mL of deionized water was added and stirred to cool to room temperature, and then 22-25 mL of hydrogen peroxide was added dropwise under stirring. After the addition was completed, it was allowed to stand for 2-3 hours for stratification, and the obtained components were recorded as stratified components;

[0016] S2.3. Remove the middle layer solution of the stratified components by aspiration, then add 50-80 mL of hydrochloric acid solution, stir and disperse, let stand for 2 hours, and wash with deionized water until neutral. The result is fluorinated graphene oxide.

[0017] Furthermore, the mass fraction of sulfuric acid solution in S2.1 is 85%, the speed of stirring reaction in S2.1 is 200r / min, the speed of stirring cooling in S2.2 is 600r / min, the speed of stirring condition in S2.2 is 300r / min, the dripping rate in S2.2 is 1 drop / s, the mass fraction of hydrochloric acid solution in S2.3 is 5%, and the specific operation of stirring and dispersing in S2.3 is stirring at a speed of 500r / min for 10min.

[0018] Furthermore, in S1, the preparation method of the modified ceramic microspheres is:

[0019] S4.1. Weigh 8-10 g of silane coupling agent KH-550 and add it to 200 mL of ethanol aqueous solution. After stirring and dispersing, add acetic acid solution dropwise to adjust the pH value to 5. Then place it in a water bath at 35°C and stir and mix. The result is recorded as coupling agent solution.

[0020] S4.2. Weigh 15-18g of hollow ceramic microbeads with a particle size of 20-100μm and add them to the coupling agent solution. Heat to 60℃ in a water bath and stir to react for 4h. Centrifuge to obtain a precipitate and wash it three times with ethanol. After drying, the modified ceramic microbeads are obtained.

[0021] Furthermore, in S4.1, the mass fraction of the ethanol aqueous solution is 80%, and the specific operation of stirring and dispersing is stirring at a speed of 600 r / min for 10 min. The mass fraction of the acetic acid solution is 20%, and the specific operation of stirring and mixing is stirring at a speed of 500 r / min for 5 min.

[0022] Furthermore, in S4.2, the speed of the stirring reaction is 500 r / min, the speed of the centrifugation is 6000 r / min, and the specific operation of the drying treatment is vacuum drying at a temperature of 70°C for 4 hours.

[0023] Furthermore, the specific operation of ultrasonic dispersion in S3 is ultrasonic dispersion at a frequency of 28 kHz for 30 minutes, and the specific operation of stirring dispersion in S3 is stirring at a rotation speed of 500 r / min for 30 minutes.

[0024] Furthermore, in S4, the preparation method of the phase change material is:

[0025] Weigh 28-30 parts by weight of paraffin wax, 0.5 parts by weight of expanded graphite and 0.3 parts by weight of sodium dodecylbenzene sulfonate into a beaker, heat to 65°C, stir at a speed of 600 r / min for 90 minutes, and then ultrasonically oscillate at a temperature of 65°C and a power of 200 W for 2 hours to obtain a phase change material.

[0026] Furthermore, in S4, the specific operation of mixing and dispersing is: stirring at a speed of 300 r / min for 10 min at a temperature of 60° C., and then stirring at a speed of 500 r / min for 10 min.

[0027] A ceramic gel phase change energy storage coating is prepared by a ceramic gel phase change energy storage coating preparation method.

[0028] Beneficial Effects

[0029] The present invention provides a ceramic gel phase change energy storage coating and a preparation method thereof. Compared with the prior art, the present invention has the following beneficial effects:

[0030] 1. The present invention can improve the wear resistance of the coating by introducing fluorinated graphene oxide and modified ceramic microbeads. In the process of preparing the ceramic coating, the fluorinated graphene oxide, the modified ceramic microbeads and the silane coupling agent are dispersed together and then mixed with the grinding components, so that a strong chemical bond can be formed between the fluorinated graphene oxide, the modified ceramic microbeads and the coating matrix. This bonding action not only enhances the bonding force between the filler and the matrix, but also improves the overall stability and durability of the coating. Combined with the performance of the fluorinated graphene oxide and the modified ceramic microbeads, the prepared ceramic coating can improve its corrosion and wear resistance while maintaining good weather resistance and corrosion resistance; secondly, the fluorinated graphene oxide, the modified ceramic microbeads and the silane coupling agent are dispersed together and then added to the ceramic coating, so that these fillers can achieve a better dispersion effect in the coating, thereby optimizing the microstructure of the coating and improving the density and uniformity of the coating.

[0031] 2. The present invention adopts paraffin wax and expanded graphite as phase change materials, and mixes them with ceramic coating, so that the coating has the function of phase change energy storage. Paraffin wax and expanded graphite as phase change materials can absorb or release a large amount of latent heat when the temperature changes. This latent heat storage and release process can be completed within a smaller temperature change range, thereby realizing efficient energy storage and release. Through the heat absorption and heat release process of the phase change material, the temperature of the coating and its surrounding environment can be effectively adjusted, reducing temperature fluctuations and improving thermal comfort; secondly, by adding mica powder and talcum powder, the wear and scratches on the coating surface can be reduced. Mica powder and talcum powder have good hardness and wear resistance, and can form a protective layer on the coating surface, thereby improving the wear resistance of the coating.

[0032] 3. The present invention combines ceramic coatings and phase change materials to prepare ceramic gel phase change energy storage coatings. The addition of some modified fillers can improve the wear resistance and corrosion resistance of the coating, thereby improving the durability of the coating and making it have a longer service life. Secondly, the ceramic coating and phase change material are combined. The phase change material can be used as a filler or thickener to help improve the overall mechanical strength and wear resistance of the coating. Moreover, paraffin and expanded graphite can absorb or release a large amount of latent heat when the temperature changes. This property combined with the ceramic coating enables the coating to store energy when needed and release it at the appropriate time, thereby effectively regulating the temperature of the coating and its surrounding environment. It is of great significance to the fields of building energy conservation, thermal management of electronic equipment, etc., and can significantly reduce energy consumption and improve thermal comfort. DETAILED DESCRIPTION

[0033] 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 below. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] The present invention will be further described below in conjunction with the embodiments.

[0035] Example 1

[0036] A preparation method of a ceramic gel phase change energy storage coating in this embodiment, the preparation method is:

[0037] S1. fluorinated graphene oxide is prepared using fluorinated graphene as a raw material, and hollow ceramic microspheres are modified using a silane coupling agent to prepare modified ceramic microspheres;

[0038] The preparation method of fluorinated graphene oxide is as follows:

[0039] S2.1, weigh 5g of fluorinated graphene and 4g of sodium nitrate, pour into 200mL of 85% sulfuric acid solution, stir at 200r / min for 90min, add 15g of potassium permanganate solid and continue to react for 10min, the result is recorded as reaction solution;

[0040] S2.2, the reaction solution was placed in a water bath at 30°C for 2 hours, then the water bath temperature was raised to 35°C and the reaction was continued for 1 hour, then 60 mL of deionized water was added and the mixture was stirred at 600 r / min and cooled to room temperature, and then 22 mL of hydrogen peroxide was added dropwise at a rate of 1 drop / s under stirring conditions at a speed of 300 r / min. After the addition was completed, the mixture was allowed to stand for 2 hours for stratification, and the obtained components were recorded as stratified components;

[0041] S2.3, remove the middle layer solution of the layered components, then add 50mL of 5% hydrochloric acid solution, stir at a speed of 500r / min for 10min, let stand for 2h, wash with deionized water until neutral, and the obtained product is fluorinated graphene oxide;

[0042] The preparation method of modified ceramic microspheres is as follows:

[0043] S4.1. Weigh 8 g of silane coupling agent KH-550 and add it to 200 mL of 80% ethanol aqueous solution. Stir at 600 r / min for 10 min, then drop 20% acetic acid solution to adjust the pH value to 5. Then, place the mixture in a water bath at 35°C and stir at 500 r / min for 5 min. The result is recorded as coupling agent solution.

[0044] S4.2. Weigh 15 g of hollow ceramic microbeads with a particle size of 20 μm and add them to the coupling agent solution. Heat to 60°C in a water bath and stir at 500 r / min for 4 hours. Centrifuge at 6000 r / min to obtain a precipitate, then wash it three times with ethanol. Place it in a vacuum dryer at 70°C for 4 hours to obtain the modified ceramic microbeads.

[0045] S2. Weigh 50 parts by weight of silica sol, 5 parts by weight of mica powder, 6 parts by weight of talc powder and 70 parts by weight of deionized water, pour them into a grinder for grinding, and filter with a 48 μm filter cloth to obtain the ground component.

[0046] S3. Weigh 6 parts by weight of fluorinated graphene oxide, 4 parts by weight of modified ceramic microbeads, 5 parts by weight of silane coupling agent KH-560 and 0.5 parts by weight of sodium dodecyl sulfate, pour them into 50 parts by weight of deionized water, ultrasonically disperse them at a frequency of 28 kHz for 30 minutes, then pour in the grinding components and stir at a speed of 500 r / min for 30 minutes. The result is recorded as ceramic coating.

[0047] S4, preparing a phase change material with paraffin and expanded graphite as raw materials, then stirring the phase change material and the ceramic coating at a weight ratio of 1:5 at a temperature of 60°C at a speed of 300 r / min for 10 minutes, and then stirring at a speed of 500 r / min for 10 minutes, to obtain a ceramic gel phase change energy storage coating;

[0048] Wherein, the preparation method of phase change material is:

[0049] Weigh 28 parts by weight of paraffin wax, 0.5 parts by weight of expanded graphite and 0.3 parts by weight of sodium dodecylbenzene sulfonate into a beaker, heat to 65°C, stir at 600 r / min for 90 minutes, and then ultrasonically oscillate at 65°C and 200 W for 2 hours to obtain a phase change material.

[0050] A ceramic gel phase change energy storage coating is prepared by a ceramic gel phase change energy storage coating preparation method.

[0051] Example 2

[0052] A preparation method of a ceramic gel phase change energy storage coating in this embodiment, the preparation method is:

[0053] S1. fluorinated graphene oxide is prepared using fluorinated graphene as a raw material, and hollow ceramic microspheres are modified using a silane coupling agent to prepare modified ceramic microspheres;

[0054] The preparation method of fluorinated graphene oxide is as follows:

[0055] S2.1, weigh 8g of fluorinated graphene and 5g of sodium nitrate, pour into 200mL of 85% sulfuric acid solution, stir at 200r / min for 90min, add 18g of potassium permanganate solid and continue to react for 10min, the result is recorded as reaction solution;

[0056] S2.2, the reaction solution was placed in a water bath at 30°C for 2 hours, then the water bath temperature was raised to 35°C and the reaction was continued for 1 hour, then 80 mL of deionized water was added and the mixture was stirred at 600 r / min and cooled to room temperature, and then 25 mL of hydrogen peroxide was added dropwise at a rate of 1 drop / s under stirring conditions at a speed of 300 r / min. After the addition was completed, the mixture was allowed to stand for 3 hours for stratification, and the obtained components were recorded as stratified components;

[0057] S2.3, remove the middle layer solution of the layered components, then add 80mL of 5% hydrochloric acid solution, stir at a speed of 500r / min for 10min, let stand for 2h, wash with deionized water until neutral, and the obtained product is fluorinated graphene oxide;

[0058] The preparation method of modified ceramic microspheres is as follows:

[0059] S4.1. Weigh 10 g of silane coupling agent KH-550 and add it to 200 mL of 80% ethanol aqueous solution. Stir at 600 r / min for 10 min, then drop 20% acetic acid solution to adjust the pH value to 5. Then, place the mixture in a water bath at 35°C and stir at 500 r / min for 5 min. The result is recorded as coupling agent solution.

[0060] S4.2. Weigh 18 g of hollow ceramic microbeads with a particle size of 100 μm and add them to the coupling agent solution. Heat to 60°C in a water bath and stir at 500 r / min for 4 hours. Centrifuge at 6000 r / min to obtain a precipitate, then wash it three times with ethanol. Place it in a vacuum dryer at 70°C for 4 hours to obtain the modified ceramic microbeads.

[0061] S2. Weigh 55 parts by weight of silica sol, 6 parts by weight of mica powder, 8 parts by weight of talc powder and 80 parts by weight of deionized water, pour them into a grinder for grinding, and filter with a 48 μm filter cloth to obtain the ground component.

[0062] S3. Weigh 7 parts by weight of fluorinated graphene oxide, 5 parts by weight of modified ceramic microbeads, 6 parts by weight of silane coupling agent KH-560 and 0.6 parts by weight of sodium dodecyl sulfate, pour them into 50 parts by weight of deionized water, ultrasonically disperse them at a frequency of 28 kHz for 30 minutes, then pour in the grinding components and stir at a speed of 500 r / min for 30 minutes. The result is recorded as ceramic coating.

[0063] S4, preparing a phase change material with paraffin and expanded graphite as raw materials, then stirring the phase change material and the ceramic coating at a weight ratio of 1:5 at a temperature of 60°C at a speed of 300 r / min for 10 minutes, and then stirring at a speed of 500 r / min for 10 minutes, to obtain a ceramic gel phase change energy storage coating;

[0064] Wherein, the preparation method of phase change material is:

[0065] Weigh 30 parts by weight of paraffin wax, 0.5 parts by weight of expanded graphite and 0.3 parts by weight of sodium dodecylbenzene sulfonate into a beaker, heat to 65°C, stir at 600 r / min for 90 minutes, and then ultrasonically oscillate at 65°C and 200 W for 2 hours to obtain a phase change material.

[0066] A ceramic gel phase change energy storage coating is prepared by a ceramic gel phase change energy storage coating preparation method.

[0067] Example 3

[0068] A preparation method of a ceramic gel phase change energy storage coating in this embodiment is as follows:

[0069] S1. fluorinated graphene oxide is prepared using fluorinated graphene as a raw material, and hollow ceramic microspheres are modified using a silane coupling agent to prepare modified ceramic microspheres;

[0070] The preparation method of fluorinated graphene oxide is as follows:

[0071] S2.1, weigh 7g of fluorinated graphene and 5g of sodium nitrate, pour into 200mL of 85% sulfuric acid solution, stir at 200r / min for 90min, add 17g of potassium permanganate solid and continue to react for 10min, the result is recorded as reaction solution;

[0072] S2.2, the reaction solution was placed in a water bath at 30°C for 2 hours, then the water bath temperature was raised to 35°C and the reaction was continued for 1 hour, then 70 mL of deionized water was added and the mixture was stirred at 600 r / min and cooled to room temperature, and then 24 mL of hydrogen peroxide was added dropwise at a rate of 1 drop / s under stirring conditions at a speed of 300 r / min. After the addition was completed, the mixture was allowed to stand for 3 hours for stratification, and the obtained components were recorded as stratified components;

[0073] S2.3, remove the middle layer solution of the layered components, then add 70mL of 5% hydrochloric acid solution, stir at a speed of 500r / min for 10min, let stand for 2h, wash with deionized water until neutral, and the obtained product is fluorinated graphene oxide;

[0074] The preparation method of modified ceramic microspheres is as follows:

[0075] S4.1. Weigh 9 g of silane coupling agent KH-550 and add it to 200 mL of 80% ethanol aqueous solution. Stir at 600 r / min for 10 min, then drop 20% acetic acid solution to adjust the pH value to 5. Then, place the mixture in a water bath at 35°C and stir at 500 r / min for 5 min. The result is recorded as coupling agent solution.

[0076] S4.2. Weigh 16 g of hollow ceramic microbeads with a particle size of 50 μm and add them to the coupling agent solution. Heat to 60°C in a water bath and stir at 500 r / min for 4 hours. Centrifuge at 6000 r / min to obtain a precipitate, then wash it three times with ethanol. Place it in a vacuum dryer at 70°C for 4 hours to obtain the modified ceramic microbeads.

[0077] S2. Weigh 53 parts by weight of silica sol, 5 parts by weight of mica powder, 7 parts by weight of talc powder and 75 parts by weight of deionized water, pour them into a grinder for grinding, and filter with a 48 μm filter cloth to obtain the ground component.

[0078] S3. Weigh 6 parts by weight of fluorinated graphene oxide, 5 parts by weight of modified ceramic microbeads, 6 parts by weight of silane coupling agent KH-560 and 0.5 parts by weight of sodium dodecyl sulfate, pour them into 50 parts by weight of deionized water, ultrasonically disperse them at a frequency of 28 kHz for 30 minutes, then pour in the grinding components and stir at a speed of 500 r / min for 30 minutes. The result is recorded as ceramic coating.

[0079] S4, preparing a phase change material with paraffin and expanded graphite as raw materials, then stirring the phase change material and the ceramic coating at a weight ratio of 1:5 at a temperature of 60°C at a speed of 300 r / min for 10 minutes, and then stirring at a speed of 500 r / min for 10 minutes, to obtain a ceramic gel phase change energy storage coating;

[0080] Wherein, the preparation method of phase change material is:

[0081] Weigh 29 parts by weight of paraffin wax, 0.5 parts by weight of expanded graphite and 0.3 parts by weight of sodium dodecylbenzene sulfonate into a beaker, heat to 65°C, stir at 600 r / min for 90 minutes, and then ultrasonically oscillate at 65°C and 200 W for 2 hours to obtain a phase change material.

[0082] A ceramic gel phase change energy storage coating is prepared by a ceramic gel phase change energy storage coating preparation method.

[0083] Comparative Example 1

[0084] The ceramic gel phase change energy storage coating and the preparation method thereof provided in this comparative example are substantially the same as those in Example 1, with the main difference being that in this comparative example 1, the fluorinated graphene oxide in Example 1 is replaced with fluorinated graphene.

[0085] Comparative Example 2

[0086] The ceramic gel phase change energy storage coating and the preparation method thereof provided in this comparative example are substantially the same as those in Example 1, with the main difference being that in this comparative example 2, the modified ceramic microbeads in Example 1 are replaced with ceramic hollow microbeads.

[0087] Comparative Example 3

[0088] The ceramic gel phase change energy storage coating and the preparation method thereof provided in this comparative example are substantially the same as those in Example 1, with the main difference being that the expanded graphite in Example 1 is replaced with paraffin in this comparative example 3.

[0089] Performance Testing

[0090] The specific testing methods and test items are as follows:

[0091] 1. Use an air spray gun to spray the ceramic gel phase change energy storage coatings in Examples 1-3 and Comparative Examples 1-3 on the surface of the substrate, cool to room temperature after curing, and then test the wear resistance and tensile strength of the coatings;

[0092] The wear resistance test method is as follows: use a DN-H21C wear tester to measure the wear resistance of the coating. Under a pressure of 4.5 kg, use a 5 cm × 5 cm scouring pad dipped in a 5 g / L detergent solution to rub the coating back and forth. One back and forth counts as one time. The scouring pad is changed every 250 times until the coating is worn out of the substrate. Record the number of frictions and the data obtained are recorded in the following table.

[0093] The tensile strength was tested according to GB / T1701-2001 "Standard for the determination of tensile strength and elongation at break of hard rubber", and the obtained data are recorded in the following table;

[0094] 2. Two cubic boxes of equal size were prepared using expanded polystyrene boards, a 60W light bulb was placed in the center of the box, and the inside of the box was coated with ceramic gel phase change energy storage coatings of Examples 1-3 and Comparative Examples 1-3 of equal thickness, respectively. After curing, the box was cooled to room temperature and placed in an environment of 10°C. The temperature inside the box was recorded 10 minutes after the light bulb was powered on, which was recorded as the initial temperature. The temperature inside the box was recorded 10 minutes after the light bulb was powered off, which was recorded as the insulation temperature. The obtained data were recorded in the following table;

[0095]

[0096] It can be seen from the data in the above table that the wear resistance and tensile strength of the ceramic gel phase change energy storage coating in the present embodiment 1-3 are significantly better than those in the comparative example 1-2, indicating that the fluorinated graphene oxide and the modified ceramic microbeads are matched and added to the coating, which can significantly improve the wear resistance and mechanical properties of the coating. The fluorinated graphene oxide, the modified ceramic microbeads and the coating matrix can form a strong chemical bond through the action of the silane coupling agent, so that a stable grid structure is formed between the fluorinated graphene oxide, the modified ceramic microbeads and the substrate of the coating. This structure includes fluorinated graphene oxide and modified ceramic microbeads with good wear resistance, thereby improving the stability of the wear resistance of the coating. Moreover, the modified ceramic hollow microbeads have better dispersibility and can be more evenly dispersed in the grid structure, so that the two materials with wear resistance are matched with each other, and the mechanical properties of the coating can be optimized on the basis of improving the wear resistance of the coating.

[0097] The temperature change in the box coated with the ceramic gel phase change energy storage coating in Examples 1-3 is significantly smaller than that in Comparative Example 3, indicating that the combination of expanded graphite and paraffin can achieve better heat storage performance. Because expanded graphite has an extremely high thermal conductivity, mixing it with paraffin can significantly improve the thermal conductivity of the composite phase change material, which makes the heat transfer inside the material more rapid and uniform, thereby accelerating the heat storage and release process. Compared with single paraffin, the combination of expanded graphite and paraffin can achieve better heat storage performance.

[0098] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0099] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for preparing a ceramic gel phase change energy storage coating, characterized in that: The preparation method is: S1. fluorinated graphene oxide is prepared using fluorinated graphene as a raw material, and hollow ceramic microspheres are modified using a silane coupling agent to prepare modified ceramic microspheres; S2, weigh 50-55 parts by weight of silica sol, 5-6 parts by weight of mica powder, 6-8 parts by weight of talc and 70-80 parts by weight of deionized water, pour them into a grinder for grinding, and filter the mixture with a 48 μm filter cloth as the grinding component; S3, weighing 6-7 parts by weight of fluorinated graphene oxide, 4-5 parts by weight of modified ceramic microbeads, 5-6 parts by weight of silane coupling agent KH-560 and 0.5-0.6 parts by weight of sodium dodecyl sulfate, pouring them into 50 parts by weight of deionized water, and then ultrasonically dispersing them, pouring in the grinding components, stirring and dispersing, and the resultant is recorded as a ceramic coating; S4. Prepare a phase change material using paraffin and expanded graphite as raw materials, and then mix and disperse the phase change material and ceramic coating in a weight ratio of 1:5 to obtain a ceramic gel phase change energy storage coating.

2. The method for preparing a ceramic gel phase change energy storage coating according to claim 1, characterized in that: In S1, the preparation method of fluorinated graphene oxide is: S2.1, weigh 5-8g of fluorinated graphene and 4-5g of sodium nitrate into 200mL of sulfuric acid solution, stir and react for 90min, then add 15-18g of potassium permanganate solid and continue to react for 10min, the result is recorded as reaction solution; S2.2, the reaction solution was placed in a water bath at 30°C for 2 hours, then the water bath temperature was raised to 35°C and the reaction was continued for 1 hour, then 60-80 mL of deionized water was added and stirred to cool to room temperature, and then 22-25 mL of hydrogen peroxide was added dropwise under stirring. After the addition was completed, it was allowed to stand for 2-3 hours for stratification, and the obtained components were recorded as stratified components; S2.

3. Remove the middle layer solution of the stratified components by aspiration, then add 50-80 mL of hydrochloric acid solution, stir and disperse, let stand for 2 hours, and wash with deionized water until neutral. The result is fluorinated graphene oxide.

3. The method for preparing a ceramic gel phase change energy storage coating according to claim 2, characterized in that: The mass fraction of sulfuric acid solution in S2.1 is 85%, the speed of stirring reaction in S2.1 is 200r / min, the speed of stirring cooling in S2.2 is 600r / min, the speed of stirring condition in S2.2 is 300r / min, the dripping rate in S2.2 is 1 drop / s, the mass fraction of hydrochloric acid solution in S2.3 is 5%, and the specific operation of stirring and dispersing in S2.3 is stirring at a speed of 500r / min for 10min.

4. The method for preparing a ceramic gel phase change energy storage coating according to claim 1, characterized in that: In S1, the preparation method of the modified ceramic microspheres is: S4.

1. Weigh 8-10 g of silane coupling agent KH-550 and add it to 200 mL of ethanol aqueous solution. After stirring and dispersing, add acetic acid solution dropwise to adjust the pH value to 5. Then place it in a water bath at 35°C and stir and mix. The result is recorded as coupling agent solution. S4.

2. Weigh 15-18g of hollow ceramic microbeads with a particle size of 20-100μm and add them to the coupling agent solution. Heat to 60℃ in a water bath and stir to react for 4h. Centrifuge to obtain a precipitate and wash it three times with ethanol. After drying, the modified ceramic microbeads are obtained.

5. The method for preparing a ceramic gel phase change energy storage coating according to claim 4, characterized in that: In S4.1, the mass fraction of the ethanol aqueous solution is 80%, and the specific operation of stirring and dispersing is stirring at a speed of 600 r / min for 10 min. The mass fraction of the acetic acid solution is 20%, and the specific operation of stirring and mixing is stirring at a speed of 500 r / min for 5 min.

6. The method for preparing a ceramic gel phase change energy storage coating according to claim 4, characterized in that: In S4.2, the speed of the stirring reaction is 500 r / min, the speed of the centrifugation is 6000 r / min, and the specific operation of the drying treatment is to place it in a vacuum dryer at a temperature of 70°C for 4 hours.

7. The method for preparing a ceramic gel phase change energy storage coating according to claim 1, characterized in that: The specific operation of ultrasonic dispersion in S3 is ultrasonic dispersion at a frequency of 28 kHz for 30 minutes, and the specific operation of stirring dispersion in S3 is stirring at a speed of 500 r / min for 30 minutes.

8. The method for preparing a ceramic gel phase change energy storage coating according to claim 1, characterized in that: In S4, the preparation method of the phase change material is: Weigh 28-30 parts by weight of paraffin wax, 0.5 parts by weight of expanded graphite and 0.3 parts by weight of sodium dodecylbenzene sulfonate into a beaker, heat to 65°C, stir at a speed of 600 r / min for 90 minutes, and then ultrasonically oscillate at a temperature of 65°C and a power of 200 W for 2 hours to obtain a phase change material.

9. The method for preparing a ceramic gel phase change energy storage coating according to claim 1, characterized in that: In S4, the specific operation of mixing and dispersing is: stirring at a speed of 300 r / min for 10 min at a temperature of 60° C., and then stirring at a speed of 500 r / min for 10 min.

10. A ceramic gel phase change energy storage coating, characterized in that: The ceramic gel phase change energy storage coating is prepared by the preparation method of any one of claims 1 to 9.

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