Weather-resistant heat storage and insulation coating for energy storage equipment and preparation method of weather-resistant heat storage and insulation coating

Abstract

The invention relates to a weather-resistant heat storage and heat preservation coating for energy storage equipment and a preparation method of the weather-resistant heat storage and heat preservation coating, and belongs to the technical field of coatings, modified composite resin is prepared from epoxy resin, organic silicon prepolymer, fluorocarbon resin, trifluoropropyl polydimethylsiloxane and other materials, and good film-forming property, adhesive force, weather resistance, binding property and energy storage and heat insulation property are provided. Paraffin, a Ti3AlC2MAX phase ceramic material, palmitic acid and polyphosphorylcholine ethylene glycol acrylate are adopted to prepare a composite energy storage material, the composite energy storage material is coated with nano-silica to obtain a nano-silica coated composite energy storage material, and the composite energy storage material is matched with components such as a weather-proof filler and a heat-insulating filler to be used according to a certain proportion. The coating has good weather resistance, corrosion resistance, heat storage and heat preservation performance, adhesive force, mechanical performance and the like.

Description

Technical Field

[0001] The present invention belongs to the technical field of coatings, and in particular relates to a weather-resistant heat storage and thermal insulation coating for energy storage equipment and a preparation method thereof. Background Art

[0002] During the operation of energy storage equipment, the storage and release of energy will be accompanied by heat changes, and temperature has a significant impact on the performance, life and safety of energy storage equipment. In some scenarios where the ambient temperature changes greatly, in order to ensure the performance and life of the battery and prevent problems such as thermal runaway of the battery, heat storage and thermal insulation coatings are used to maintain the relative stability of the battery pack temperature and reduce the impact of temperature on the battery. In thermal energy storage equipment, such as hot water storage tanks, phase change energy storage devices, etc., the application of heat storage and thermal insulation coatings can effectively reduce heat loss to the surrounding environment, improve energy storage efficiency, reduce energy loss, and enable thermal energy to be stored and utilized more effectively.

[0003] As a key material that can effectively regulate the temperature of energy storage equipment, thermal insulation coatings have received extensive attention and research in recent years. Although traditional thermal insulation coatings have certain thermal insulation properties, they often expose many limitations in the application scenarios of energy storage equipment. On the one hand, their weather resistance is insufficient and it is difficult to adapt to the complex and changeable outdoor environment. Under the harsh conditions of long-term ultraviolet radiation, rainfall erosion, etc., the molecular structure of traditional coatings is prone to degradation and aging, resulting in powdering and peeling of the coating, and a sharp decline in thermal insulation performance. For example, in energy storage power stations on the seaside, due to the erosion of high-salinity sea breezes, ordinary thermal insulation coatings may be severely corroded and damaged in just a few months, and can no longer provide effective temperature protection for energy storage equipment. On the other hand, the heat storage capacity of traditional thermal insulation coatings is limited. In addition, traditional coatings are also insufficient in terms of compatibility with the shell materials of energy storage equipment, adhesion, and mechanical properties, and are prone to problems such as cracking and shedding of the coating, which reduces the protective effect and service life of the coating.

[0004] With the continuous development of energy storage technology, higher requirements are placed on the performance of heat storage and thermal insulation coatings. Not only does the coating need to have excellent weather resistance, be able to work stably for a long time in various harsh environments, and effectively resist the erosion of factors such as ultraviolet rays and rainfall; it also requires the coating to have efficient heat storage and thermal insulation performance; and at the same time have good adhesion. The development of high-performance energy storage equipment coatings has become a key issue that needs to be urgently solved in the field of energy storage. Summary of the invention

[0005] In view of the fact that existing ordinary coatings cannot well meet the above-mentioned performance requirements of energy storage devices, the present invention provides a weather-resistant heat storage and heat insulation coating for energy storage devices and its preparation method. A modified composite resin is used to provide good film-forming property, adhesion, weather resistance, restraint property and energy storage heat insulation property. Nano-silica-coated composite energy storage materials are used for heat storage and heat insulation, and in combination with weather-resistant fillers, heat insulation fillers and other components used in a certain proportion, the coating has good weather resistance, corrosion resistance, heat storage and heat insulation performance, adhesion and mechanical properties, etc. The specific technical solutions are as follows:

[0006] A weather-resistant heat storage and heat insulation coating for energy storage devices, the coating comprising the following raw materials in parts by mass: 30 parts to 40 parts of a modified composite resin, 20 parts to 25 parts of nano-silica-coated composite energy storage materials, 12 parts to 18 parts of weather-resistant fillers, 15 parts to 20 parts of heat insulation fillers, 1 part to 2 parts of a silane coupling agent, 0.5 part to 0.8 part of a hydrophobic modified polyurethane leveling agent, 1 part to 2 parts of nano-cerium oxide, 0.5 part to 0.8 part of a polyether-modified silicone defoaming agent, 2 parts to 5 parts of pigments and 45 parts to 90 parts of a co-solvent.

[0007] In the preparation method of the above-mentioned modified composite resin, the method comprises the following steps: epoxy resin and an organosilicon prepolymer are stirred and mixed according to a mass ratio of (1 to 1.5):(2 to 2.5) to obtain material A, and then 8% to 10% of fluorocarbon resin based on the mass of material A and 4% to 6% of trifluoropropyl polydimethylsiloxane based on the mass of material A are added. Under nitrogen protection, the mixture is stirred and reacted at 65°C to 75°C for 2 h to 3 h to obtain material B; 0.4% to 0.6% of dibutyltin dilaurate catalyst based on the mass of material B is added, the temperature is raised to 80°C to 90°C and stirring and reaction are continued for 1 h to 1.5 h, and then the temperature is lowered to obtain the modified composite resin.

[0008] In the preparation method of the above-mentioned modified composite resin, the organosilicon prepolymer is prepared by mixing phenyltriethoxysilane and methyltriethoxysilane according to a mass ratio of 3:(1 to 1.2).

[0009] In the above-mentioned coating, the preparation method of the nano-silica-coated composite energy storage material comprises the following steps: melting paraffin:Ti3AlC2 MAX-phase ceramic material:palmitic acid:polyphosphorylcholine ethylene glycol acrylate = (4-6):(3-5):(3-5):(3-5) by mass to obtain material C. Under stirring, expandable graphite powder accounting for 4%-6% of the mass of material C is added and mixed until uniform to obtain material D; preparing a modifier according to tetraethyl orthosilicate:ethanol:hydrochloric acid aqueous solution = (1-1.5):(3-5):(0.1-0.2); under stirring, material D is added to the modifier according to the mass ratio of material D:modifier = (1-2):(30-40), and stirred and reacted for 2 h-3 h, aged and polycondensed for 6 h-12 h, vacuum dried, and sieved to obtain the nano-silica-coated composite energy storage material.

[0010] In the preparation method of the above-mentioned nano-silica-coated composite energy storage material, the melting temperature is 60°C-70°C; the concentration of the hydrochloric acid aqueous solution is 0.5 mol / L-1 mol / L; the vacuum drying is to vacuum dry at 80°C-85°C until constant weight; the mesh number of the sieve for sieving is 100 mesh-150 mesh.

[0011] In the above-mentioned coating, the weather-resistant filler is in a mass ratio of glass powder to nano-boron nitride of (3-3.5):(1-1.5).

[0012] In the above-mentioned coating, the heat-insulating filler is in a mass ratio of hydrophobic aerogel powder to far-infrared ceramic powder of (2-2.5):(1-1.5).

[0013] In the above-mentioned coating, the co-solvent is in a mass ratio of propylene glycol methyl ether acetate to methyl isobutyl ketone of (1-2):(1-1.5).

[0014] In the above-mentioned coating, the silane coupling agent is silane coupling agent KH-560.

[0015] The preparation method of the above-mentioned weather-resistant energy storage device heat storage and heat preservation coating comprises the following steps: mixing the modified composite resin and the co-solvent by mass; then adding the weather-resistant filler and nano-cerium oxide for mixing; then adding the heat-insulating filler and the pigment for mixing; then adding the nano-silica-coated composite energy storage material, hydrophobic modified polyurethane leveling agent and polyether modified silicone defoaming agent for mixing; finally adding the silane coupling agent for mixing; grinding, filtering, and finally mixing evenly to obtain the coating.

[0016] A weather-resistant energy storage device heat storage and heat preservation coating and its preparation method provided by the present invention have the following beneficial effects:

[0017] I. The present invention designs a modified composite resin and its preparation method. First, phenyltriethoxysilane and methyltriethoxysilane are mixed to prepare an organosilicon prepolymer. Both contain hydrolyzable ethoxy groups, which can form silanols after hydrolysis and then polycondense to form an organosilicon polymer with a certain crosslinked structure, providing good weather resistance and flexibility for the resin. Epoxy resin is mixed with the organosilicon prepolymer. The epoxy resin contains epoxy groups and can react with the active groups in the organosilicon prepolymer to combine the two, combining the high strength of the epoxy resin and the characteristics of the organosilicon. Fluorocarbon resin and 3,3,3-trifluoropropylpolydimethylsiloxane are added. The fluorocarbon resin has excellent weather resistance, corrosion resistance and low surface energy. 3,3,3-trifluoropropylpolydimethylsiloxane can further improve the weather resistance, hydrophobicity and flexibility of the resin, and can improve the compatibility of each component. In addition, the fluorocarbon resin and 3,3,3-trifluoropropylpolydimethylsiloxane can also participate in partial crosslinking reactions, enabling the system to form a certain structure, improving the stability of the resin structure, enhancing its own heat insulation effect, and restricting the energy storage stability of the energy storage material to improve the heat storage and heat preservation performance. Dibutyltin dilaurate catalyst is used to promote the reaction to obtain a modified composite resin with excellent performance.

[0018] Through the composite modification of various resins and siloxanes, the product combines the weather resistance, hydrophobicity of the organosilicon, the high strength of the epoxy resin, the high weather resistance and corrosion resistance of the fluorocarbon resin, etc., making the modified composite resin have good stability, weather resistance, corrosion resistance and adhesion. When used in combination with other components, it can well fuse and crosslink other materials, effectively improving the heat storage and heat preservation performance.

[0019] II. The present invention designs a nano-silica-coated composite energy storage material and its preparation method. Paraffin, Ti3AlC2 MAX phase ceramic material, palmitic acid and polyphosphorylcholine ethylene glycol acrylate are melt-blended. Paraffin and palmitic acid are phase change materials that can absorb and release heat within a certain temperature range to play an energy storage role; the Ti3AlC2 MAX phase ceramic material can restrict paraffin and palmitic acid, improve the morphological stability of the coating during the heat storage process, enhance the thermal shock resistance of the phase change material and the coating, prevent cracking due to the influence of thermal expansion and contraction, reduce the service life, and the Ti3AlC2 MAX phase ceramic material has a certain heat storage and heat preservation performance, as well as improved weather resistance and corrosion resistance; polyphosphorylcholine ethylene glycol acrylate can improve the compatibility and stability of the materials to achieve good synthesis of the materials. Expandable graphite powder is added, which has a high specific surface area and good thermal conductivity to improve the thermal conductivity and energy storage performance of the materials. A modifier is prepared. Tetraethyl orthosilicate hydrolyzes to form silica under the action of ethanol and hydrochloric acid aqueous solution. Material D is added to the modifier under stirring, and the silica is coated on the surface of Material D to form a nano-silica-coated structure, improving the stability, weather resistance and heat insulation of the materials.

[0020] Through the synergistic effect of various components, the product has good heat storage performance, can quickly absorb and release heat. At the same time, the combined use of Ti3AlC2 MAX phase ceramic material, polyphosphorylcholine ethylene glycol acrylate and nano-silica coating improves the stability, weather resistance and heat insulation of the heat storage material, enabling it to stably play the role of heat storage and heat preservation in different environments, and has good thermal shock resistance to prevent the coating from cracking due to the influence of thermal expansion and contraction.

[0021] Third, the modified composite resin of the present invention provides good film-forming property, adhesion, weather resistance, restraint and energy storage and heat insulation properties; the nano-silica-coated composite energy storage material is mainly responsible for heat storage and heat preservation; the weather-resistant fillers glass powder and nano-boron nitride improve the weather resistance and wear resistance of the coating; the heat insulation fillers hydrophobic aerogel powder and far-infrared ceramic powder reduce heat loss; each component cooperates with each other, making the coating have good weather resistance, corrosion resistance, heat storage and heat preservation performance, adhesion and mechanical properties, etc., and has good practical value. Specific embodiments

[0022] The present invention will be further described below in conjunction with specific implementation cases, but the present invention is not limited to these embodiments.

[0023] Example 1

[0024] A weather-resistant energy storage device heat storage and heat preservation coating, the coating comprises the following raw materials in parts by mass: 35 parts of modified composite resin, 22 parts of nano-silica-coated composite energy storage material, 15 parts of weather-resistant filler, 18 parts of heat insulation filler, 1.5 parts of silane coupling agent, 0.6 part of hydrophobic modified polyurethane leveling agent, 1.5 parts of nano-ceria, 0.6 part of polyether-modified organosilicon defoaming agent, 3 parts of pigment and 68 parts of co-solvent.

[0025] Among them, the preparation method of the modified composite resin includes the following steps: phenyltriethoxysilane and methyltriethoxysilane are stirred and mixed at a mass ratio of 3:1 at 250 r / min for 35 min to prepare an organosilicon prepolymer; epoxy resin and the organosilicon prepolymer are stirred and mixed at a mass ratio of 1.2:2.3 at 350 r / min for 40 min to obtain material A, and then 9% of fluorocarbon resin based on the mass of material A and 5% of trifluoropropyl polydimethylsiloxane based on the mass of material A are added, and under nitrogen protection, the reaction is stirred at 70 °C and 350 r / min for 2.5 h to obtain material B; continue to add 0.5% of dibutyltin dilaurate catalyst based on the mass of material B under nitrogen protection, heat up to 85 °C and continue to stir and react at 350 r / min for 1 h, and cool to room temperature to obtain the modified composite resin.

[0026] Among them, the preparation method of the nano-silica-coated composite energy storage material includes the following steps: According to the mass ratio of paraffin: Ti3AlC2 MAX phase ceramic material: palmitic acid: polyphosphorylcholine ethylene glycol acrylate = 5:4:4:4, melt-blend at 65 °C and 250 r / min for 45 min to obtain material C. Under the stirring state of 250 r / min, add expandable graphite powder accounting for 5% of the mass of material C, and mix at 250 r / min for 25 min to obtain material D. Prepare a modifier according to tetraethyl orthosilicate: ethanol: hydrochloric acid aqueous solution = 1.3:4:0.15, wherein the concentration of the hydrochloric acid aqueous solution is 0.8 mol / L. Under the stirring state of 250 r / min, add material D to the modifier according to the mass ratio of material D: modifier = 1.5:35, stir and react at 250 r / min for 2.5 h, age and polycondense for 8 h, vacuum dry at 82 °C to constant weight, screen with a 150-mesh sieve, and take the undersize to obtain the nano-silica-coated composite energy storage material.

[0027] Among them, the weather-resistant filler is glass powder and nano-boron nitride with a mass ratio of 3.2:1.3. The heat-insulating filler is hydrophobic aerogel powder and far-infrared ceramic powder with a mass ratio of 2.2:1.3. The co-solvent is propylene glycol methyl ether acetate and methyl isobutyl ketone with a mass ratio of 1.5:1.2. The silane coupling agent is silane coupling agent KH-560.

[0028] The preparation method of the above weather-resistant energy storage device heat storage and heat preservation coating includes the following steps: By mass, mix the modified composite resin with the co-solvent and stir at 350 r / min for 15 min; then add the weather-resistant filler and nano-cerium oxide and mix, disperse at high speed of 3500 r / min for 35 min; then add the heat-insulating filler and pigment and mix, disperse at high speed of 1500 r / min for 15 min; then add the nano-silica-coated composite energy storage material, hydrophobic modified polyurethane leveling agent and polyether modified silicone defoaming agent and mix, stir at 500 r / min for 15 min; finally add the silane coupling agent and stir at 350 r / min for 15 min; grind, the grinding medium is zirconia with a particle size of 0.4 mm, the grinding speed is 2000 rpm; the feeding speed is 4 L / min, filter with a 200-mesh sieve, and finally mix evenly to obtain the coating.

[0029] Example 2

[0030] A weather-resistant energy storage device heat storage and heat preservation coating, the coating includes the following raw materials in parts by mass: 30 parts of modified composite resin, 20 parts of nano-silica-coated composite energy storage material, 12 parts of weather-resistant filler, 15 parts of heat-insulating filler, 1 part of silane coupling agent, 0.5 part of hydrophobic modified polyurethane leveling agent, 1 part of nano-cerium oxide, 0.5 part of polyether modified silicone defoaming agent, 2 parts of pigment and 45 parts of co-solvent.

[0031] Among them, the preparation method of the modified composite resin includes the following steps: Mix phenyltriethoxysilane and methyltriethoxysilane at a mass ratio of 3:1 and stir at 200 r / min for 30 min to prepare an organosilicon prepolymer; Mix epoxy resin and the organosilicon prepolymer at a mass ratio of 1:2 and stir at 300 r / min for 30 min to obtain Material A. Then add 8% of fluorocarbon resin and 4% of trifluoropropyl polydimethylsiloxane based on the mass of Material A, and under nitrogen protection, stir and react at 65 °C and 300 r / min for 2 h to obtain Material B; Continue to add 0.4% of dibutyltin dilaurate catalyst based on the mass of Material B under nitrogen protection, heat up to 80 °C and continue to stir and react at 300 r / min for 1 h, and cool to room temperature to obtain the modified composite resin.

[0032] Among them, the preparation method of the nano-silica-coated composite energy storage material includes the following steps: According to the mass ratio of paraffin:Ti3AlC2 MAX phase ceramic material:palmic acid:polyphosphorylcholine ethylene glycol acrylate = 4:3:3:5, melt and blend at 60 °C and 200 r / min for 30 min to obtain Material C. Under the stirring state of 200 r / min, add 4% of expandable graphite powder based on the mass of Material C and mix at 200 r / min for 20 min to obtain Material D. Prepare a modifier according to tetraethyl orthosilicate:ethanol:hydrochloric acid aqueous solution = 1:3:0.1, where the concentration of the hydrochloric acid aqueous solution is 0.5 mol / L. Under the stirring state of 200 r / min, add Material D to the modifier according to the mass ratio of Material D:modifier = 1:30, stir and react at 200 r / min for 2 h, age and polycondense for 6 h, vacuum dry at 80 °C to constant weight, screen with a 100-mesh sieve, and take the undersize to obtain the nano-silica-coated composite energy storage material.

[0033] Among them, the weather-resistant filler is a glass powder and nano-boron nitride with a mass ratio of 3:1. The heat-insulating filler is a hydrophobic aerogel powder and far-infrared ceramic powder with a mass ratio of 2:1. The co-solvent is propylene glycol methyl ether acetate and methyl isobutyl ketone with a mass ratio of 1:1. The silane coupling agent is silane coupling agent KH-560.

[0034] The preparation method of the above-mentioned weather-resistant energy storage device heat storage and heat preservation coating comprises the following steps: By mass parts, mix the modified composite resin and the co-solvent, and stir at 300 r / min for 10 min; then add the weather-resistant filler and nano-ceria for mixing, and disperse at a high speed of 3000 r / min for 30 min; then add the heat-insulating filler and the pigment for mixing, and disperse at a high speed of 1000 r / min for 10 min; then add the nano-silica-coated composite energy storage material, the hydrophobic modified polyurethane leveling agent and the polyether modified silicone defoaming agent for mixing, and stir at 400 r / min for 10 min; finally add the silane coupling agent and stir at 300 r / min for 10 min; grind, the grinding medium is zirconia with a particle size of 0.3 mm, the grinding speed is 1500 rpm; the feeding speed is 3 L / min, filter through a 150-mesh sieve, and finally mix evenly to obtain the coating.

[0035] Example 3

[0036] A weather-resistant energy storage device heat storage and heat preservation coating, the coating comprises the following raw materials by mass parts: 40 parts of modified composite resin, 25 parts of nano-silica-coated composite energy storage material, 18 parts of weather-resistant filler, 20 parts of heat-insulating filler, 2 parts of silane coupling agent, 0.8 part of hydrophobic modified polyurethane leveling agent, 2 parts of nano-ceria, 0.8 part of polyether modified silicone defoaming agent, 5 parts of pigment and 90 parts of co-solvent.

[0037] Among them, the preparation method of the modified composite resin comprises the following steps: Mix phenyltriethoxysilane and methyltriethoxysilane according to a mass ratio of 3:1.2, and stir and mix at 300 r / min for 40 min to prepare an organosilicon prepolymer; Mix epoxy resin and the organosilicon prepolymer according to a mass ratio of 1.5:2.5, and stir and mix at 400 r / min for 45 min to obtain material A, then add 10% of fluorocarbon resin based on the mass of material A and 6% of trifluoropropyl polydimethylsiloxane based on the mass of material A, and under nitrogen protection, stir and react at 75 °C and 400 r / min for 3 h to obtain material B; Continue under nitrogen protection, add 0.6% of dibutyltin dilaurate catalyst based on the mass of material B, raise the temperature to 90 °C and continue to stir and react at 400 r / min for 1.5 h, and cool to room temperature to obtain the modified composite resin.

[0038] Among them, the preparation method of the nano-silica-coated composite energy storage material includes the following steps: According to the mass ratio of paraffin: Ti3AlC2 MAX-phase ceramic material: palmitic acid: polyphosphorylcholine ethylene glycol acrylate = 6:5:5:3, melt-blend at 70 °C and 300 r / min for 60 min to obtain material C. Under the stirring state of 300 r / min, add expandable graphite powder accounting for 6% of the mass of material C, and mix at 300 r / min for 30 min to obtain material D. Prepare a modifier according to tetraethyl orthosilicate: ethanol: hydrochloric acid aqueous solution = 1.5:5:0.2, wherein the concentration of the hydrochloric acid aqueous solution is 1 mol / L. Under the stirring state of 300 r / min, add material D to the modifier according to the mass ratio of material D: modifier = 2:40, stir and react at 300 r / min for 3 h, age and polycondense for 12 h, vacuum dry at 85 °C to constant weight, screen with a 150-mesh sieve, and take the undersize to obtain the nano-silica-coated composite energy storage material.

[0039] Among them, the weather-resistant filler is the mass ratio of glass powder to nano-boron nitride of 3.5:1.5. The heat-insulating filler is the mass ratio of hydrophobic aerogel powder to far-infrared ceramic powder of 2.5:1.5. The co-solvent is the mass ratio of propylene glycol methyl ether acetate to methyl isobutyl ketone of 2:1.5. The silane coupling agent is silane coupling agent KH-560.

[0040] The preparation method of the above-mentioned weather-resistant energy storage device heat storage and heat preservation coating includes the following steps: By mass, mix the modified composite resin with the co-solvent and stir at 400 r / min for 20 min; then add the weather-resistant filler and nano-cerium oxide and mix, disperse at high speed at 4000 r / min for 40 min; then add the heat-insulating filler and pigment and mix, disperse at high speed at 2000 r / min for 20 min; then add the nano-silica-coated composite energy storage material, hydrophobic modified polyurethane leveling agent and polyether-modified silicone defoaming agent and mix, stir at 600 r / min for 20 min; finally add the silane coupling agent and stir at 400 r / min for 20 min; grind, the grinding medium is zirconia with a particle size of 0.5 mm, the grinding speed is 2500 rpm; the feeding speed is 5 L / min, filter with a 200-mesh sieve, and finally mix evenly to obtain the coating.

[0041] In the above embodiments, phenyltriethoxysilane is sourced from Shanghai Aoji Chemical Co., Ltd. Methyltriethoxysilane is sourced from Jinan Zhiyuancheng Chemical Co., Ltd. The epoxy resin is sourced from Wuxi Qianguang Chemical Raw Materials Co., Ltd., with model E-446101 and viscosity of 20,000 mPas. The fluorocarbon resin is FEVE type fluorocarbon resin, sourced from Xiamen Aikema Chemical Co., Ltd., with model ZHM-2. Trifluoropropylpolydimethylsiloxane is sourced from Shenzhen Jipeng Silicon Fluoride Materials Co., Ltd. Dibutyltin dilaurate catalyst is sourced from Jinan Haiyuan Chemical Co., Ltd. Paraffin wax is sourced from Shijiazhuang Bojian Fine Chemical Co., Ltd., paraffin wax 54#, with melting point below 56°C. Ti3AlC2 MAX phase ceramic material is sourced from Qinghe Benu Metal Materials Co., Ltd., with model BY-Ti3ALC2 and particle size of 400 mesh. Palmitic acid is sourced from Shandong Yijia Chemical Co., Ltd. Polyphosphorylcholine ethylene glycol acrylate is sourced from Hubei Jiahui Xingcheng Biotechnology Co., Ltd. Expandable graphite powder is sourced from Qingdao Pingdu Fukang Graphite Processing Factory, with model 300 mesh colloidal graphite. Tetraethyl orthosilicate is sourced from Jinan Duoweiqiao Chemical Co., Ltd. Glass powder is sourced from Guangdong Qichen New Materials Technology Co., Ltd., with model D233 and 2000 mesh. Nano boron nitride is sourced from Shanghai Pantian Powder Materials Co., Ltd., with model PT-BN-500nm. Hydrophobic aerogel powder is sourced from Forsman Technology (Beijing) Co., Ltd., below 20μm. Far-infrared ceramic powder is sourced from Shijiazhuang Sizhou New Materials Co., Ltd., nanoscale. The silane coupling agent is silane coupling agent KH-560, sourced from Dongguan Kangjin New Materials Technology Co., Ltd. Hydrophobic modified polyurethane leveling agent is sourced from Dongguan Bogao Chemical Co., Ltd., product number BG95. Nano cerium oxide is sourced from Hangzhou Jiupeng New Materials Co., Ltd. Polyether modified silicone defoamer is sourced from Shanghai Huiyan New Materials Co., Ltd., with model HY-6803. Propylene glycol methyl ether acetate is sourced from Shandong Jinyuanyuan New Materials Co., Ltd. Methyl isobutyl ketone is sourced from Langcheng Chemical Co., Ltd.

[0042] Comparative Example 1

[0043] The modified composite resin is replaced with epoxy resin; other parameters and methods are the same as those in Example 1.

[0044] Comparative Example 2

[0045] In the preparation method of the modified composite resin, trifluoropropylpolydimethylsiloxane is not added; other parameters and methods are the same as those in Example 1.

[0046] Comparative Example 3

[0047] In the preparation method of the modified composite resin, fluorocarbon resin is not added; other parameters and methods are the same as those in Example 1.

[0048] Comparative Example 4

[0049] In the preparation method of the nano-silica-coated composite energy storage material, polyphosphorylcholine ethylene glycol acrylate is not added; other parameters and methods are the same as those in Example 1.

[0050] Comparative Example 5

[0051] In the preparation method of the nano-silica-coated composite energy storage material, the Ti3AlC2 MAX phase ceramic material is not added; other parameters and methods are the same as those in Example 1.

[0052] Perform performance tests on the above-mentioned coatings.

[0053] 1. Xenon lamp aging test: Select titanium dioxide as the pigment for the coating sample. Coat the coating on a 150 mm × 70 mm × 3 mm aluminum plate, cure it, and the coating thickness is 150 μm to obtain a sample. Place the sample in a xenon lamp aging test chamber, and set the test conditions as light intensity 1000 W / m 2 , blackboard temperature 45 °C, relative humidity 65%, rainfall cycle is 18 min / 102 min (rainfall time / non-rainfall time), simulate the dry-wet cycle in the natural environment, take out the sample after 1500 hours to observe phenomena such as powdering, cracking, and peeling, and conduct aging rating. The test results are shown in Table 1 below.

[0054] Aging rating standard:

[0055]

[0056] 2. Salt spray corrosion test: Select titanium dioxide as the pigment for the coating sample. Coat the coating on a 150 mm × 70 mm × 3 mm aluminum plate, cure it, and the coating thickness is 150 μm to obtain a sample. Prepare a 5% sodium chloride solution with a pH value of 6.8. Place the sample in a salt spray test chamber, with the sample at an angle of 30° to the vertical direction, set the test temperature to 35 °C, and spray continuously. Take out the sample after 1500 hours to observe whether there are phenomena such as blistering, cracking, and peeling, and conduct corrosion rating. The test results are shown in Table 1 below.

[0057] Corrosion rating standard:

[0058]

[0059]

[0060] 3. Heat storage and insulation performance test:

[0061] Coat the outer surface of a 10 L stainless steel storage tank (wall thickness 1.5 mm) with 3 mm of the coating, the ambient temperature is 25 °C, and the storage tank is filled with warm water at 60 °C; record the time min required for the water temperature to drop to 30 °C. The test results are shown in Table 1 below.

[0062] 4. Adhesion Test: For the paint sample, titanium dioxide is selected as the pigment. The paint is coated on an aluminum plate with dimensions of 150 mm × 70 mm × 3 mm, cured, and the coating thickness is 200 μm to obtain the sample. Using a cross cutter perpendicular to the coating surface, 100 small squares with a side length of 1 mm are evenly and forcefully cut. During the cutting process, ensure that the tool completely cuts into the coating to the substrate surface. Use a soft brush to gently brush along the diagonal of the squares 5 times to remove the debris generated by cutting. Select a standard tape with an adhesion of 3 N / cm, paste the tape on the cut area, and press it firmly from one end to the other with your finger to ensure full contact between the tape and the coating without bubbles and wrinkles. Quickly tear off the tape at an angle of approximately 90°, observe the peeling of the square coating, and conduct adhesion rating. The test results are shown in Table 1 below.

[0063] Adhesion Rating Standard:

[0064] Level Phenomenon description 5B The cutting edge is completely smooth without any cell falling off; 4B There is a little coating falling off at the intersection of the cut, but the falling-off area does not exceed 5%; 3B The coating falls off significantly at the edge and intersection of the cut, but the falling-off area does not exceed 15%; 2B The coating partially or completely falls off along the edge of the cut, and the falling-off area does not exceed 35%; 1B The coating falls off in a large area along the edge of the cut or some cells fall off, and the falling-off area does not exceed 65%; 0B Falling-off area > 65%

[0065] Table 1 Test Results

[0066]

[0067]

[0068] From the above results, it can be seen that the paints prepared in Examples 1 to 5 have excellent weather resistance, corrosion resistance, good heat storage and insulation capabilities, good adhesion, and a long service life.

[0069] In Comparative Example 1, epoxy resin is directly used to replace the modified composite resin. Epoxy resin itself lacks the excellent weather resistance and corrosion resistance possessed by silicone and fluorocarbon resins. The silicone component can enhance the flexibility and UV resistance of the resin, while fluorocarbon resin has excellent chemical stability and weather resistance. In the xenon lamp aging test, due to the lack of these key components, the molecular structure of epoxy resin is prone to degradation and fracture under long-term UV irradiation, resulting in a large number of bubbles, severe powdering, cracks, and peeling on the coating, and a low aging rating. In the salt spray corrosion test, epoxy resin cannot effectively resist salt spray erosion, with serious rusting and bubbling, and a low corrosion rating. From the perspective of thermal performance, the molecular structure of epoxy resin determines that its thermal conductivity is relatively high, which is not conducive to heat storage and insulation. At the same time, the bonding force between epoxy resin and the aluminum plate is relatively weak, and the coating at the cut area is prone to peeling.

[0070] In the preparation of the modified composite resin of Comparative Example 2, trifluoropropyl polydimethylsiloxane was not added. Trifluoropropyl polydimethylsiloxane can significantly improve the flexibility and chemical corrosion resistance of the resin. After the absence of this component, the stability of the resin decreases when facing harsh environments such as ultraviolet rays and salt spray. In terms of thermal performance, trifluoropropyl polydimethylsiloxane optimizes the overall heat conduction, the heat storage and insulation performance decreases, and the water temperature cooling time shortens. However, due to the still functioning of other components such as fluorocarbon resin, the performance degradation is not as obvious as that of Comparative Example 1. In terms of adhesion, it has a certain auxiliary effect on the bonding of the coating and the substrate, and the lack of it makes the adhesion slightly decrease.

[0071] Comparative Example 3 does not add fluorocarbon resin. Fluorocarbon resin has excellent weather resistance and chemical stability, and is a key component to ensure the long-term stable performance of the coating in harsh environments. After the absence of fluorocarbon resin, the ultraviolet resistance and chemical erosion resistance of the modified composite resin decrease. Fluorocarbon resin also contributes to the optimization of the overall thermal performance of the coating, and its absence leads to changes in the cross-linked structure and a decrease in the heat storage and insulation performance. In terms of adhesion, the cross-linked structure formed by fluorocarbon resin helps to enhance the bonding force between the coating and the substrate, and the lack of it affects the adhesion to a certain extent.

[0072] In the preparation of the nano-silica-coated composite energy storage material of Comparative Example 4, polyphosphorylcholine ethylene glycol acrylate was not added. Polyphosphorylcholine ethylene glycol acrylate can improve the stability and energy storage performance of the energy storage material. The lack of it will cause the performance of the energy storage material to decline. In the heat storage and insulation performance test, since the energy storage material cannot effectively store and release heat to maintain temperature stability, the time required for the water temperature to drop from 60°C to 40°C shortens. However, it has little impact on the weather resistance, corrosion resistance and adhesion of the coating, because these properties of the coating are mainly ensured by other components such as resin, filler and additives, so there is no obvious change in appearance in the aging and corrosion tests, and the adhesion rating is still 5B.

[0073] In the preparation of the nano-silica-coated composite energy storage material of Comparative Example 5, Ti3AlC2 MAX phase ceramic material was not added. The binding ability to paraffin and palmitic acid decreases, and the heat storage efficiency of the Ti3AlC2 MAX phase ceramic material is absent, resulting in a reduction in the efficacy of the composite energy storage material, and the structure of the energy storage material undergoes an essential change, affecting the heat storage and insulation effect of the coating, and the weather resistance, corrosion resistance and adhesion all decrease.

Claims

1. A heat storage and insulation coating for weather-resistant energy storage devices, characterized in that, The coating comprises raw materials in the following parts by mass: 30 to 40 parts of modified composite resin, 20 to 25 parts of nano-silica-coated composite energy storage material, 12 to 18 parts of weather-resistant filler, 15 to 20 parts of heat-insulating filler, 1 to 2 parts of silane coupling agent, 0.5 to 0.8 part of hydrophobic modified polyurethane leveling agent, 1 to 2 parts of nano-cerium oxide, 0.5 to 0.8 part of polyether-modified silicone defoaming agent, 2 to 5 parts of pigment, and 45 to 90 parts of co-solvent.

2. The heat storage and insulation coating for a weather-resistant energy storage device according to claim 1, wherein The preparation method of the modified composite resin comprises the following steps: epoxy resin and organosilicon prepolymer are stirred and mixed in a mass ratio of (1 to 1.5):(2 to 2.5) to obtain material A, then 8% to 10% of fluorocarbon resin and 4% to 6% of trifluoropropyl polydimethylsiloxane based on the mass of material A are added, and under nitrogen protection, the mixture is stirred and reacted at 65°C to 75°C for 2 h to 3 h to obtain material B; 0.4% to 0.6% of dibutyltin dilaurate catalyst based on the mass of material B is added, the temperature is raised to 80°C to 90°C and stirring reaction continues for 1 h to 1.5 h, and then the temperature is lowered to obtain the modified composite resin.

3. The heat storage and insulation coating for a weather-resistant energy storage device according to claim 2, characterized in that, The organosilicon prepolymer is prepared by mixing phenyltriethoxysilane and methyltriethoxysilane in a mass ratio of 3:(1 to 1.2).

4. A heat storage and insulation coating for weather-resistant energy storage equipment according to claim 1, characterized in that, The preparation method of the nano-silica-coated composite energy storage material comprises the following steps: paraffin:Ti3AlC2 MAX phase ceramic material:palmic acid:polyphosphorylcholine ethylene glycol acrylate = (4 to 6):(3 to 5):(3 to 5):(3 to 5) are melted by mass ratio to obtain material C, under stirring, 4% to 6% of expandable graphite powder based on the mass of material C is added and mixed evenly to obtain material D; tetraethyl orthosilicate:ethanol:hydrochloric acid aqueous solution = (1 to 1.5):(3 to 5):(0.1 to 0.2) are formulated into a modifier; under stirring, based on the mass ratio of material D:modifier = (1 to 2):(30 to 40), material D is added to the modifier, stirred and reacted for 2 h to 3 h, aged and polycondensed for 6 h to 12 h, vacuum dried, and sieved to obtain the nano-silica-coated composite energy storage material.

5. A heat storage and insulation coating for weather-resistant energy storage equipment according to claim 4, characterized in that, The melting temperature is 60°C to 70°C; the concentration of the hydrochloric acid aqueous solution is 0.5 mol / L to 1 mol / L; the vacuum drying is carried out at 80°C to 85°C until constant weight; the mesh number of the sieve for sieving is 100 mesh to 150 mesh.

6. The heat storage and insulation coating for a weather-resistant energy storage device according to claim 1, characterized in that The weather-resistant filler is a glass powder and nano-boron nitride in a mass ratio of (3 to 3.5):(1 to 1.5).

7. A heat storage and heat preservation coating for a weather-resistant energy storage device according to claim 1, characterized in that, The heat-insulating filler is a hydrophobic aerogel powder and far-infrared ceramic powder in a mass ratio of (2 to 2.5):(1 to 1.5).

8. The heat storage and insulation coating for weather-resistant energy storage equipment according to claim 1, characterized in that The co-solvent is propylene glycol methyl ether acetate and methyl isobutyl ketone in a mass ratio of (1 to 2):(1 to 1.5).

9. A heat storage and insulation coating for weather-resistant energy storage devices according to claim 1, characterized in that, The silane coupling agent is silane coupling agent KH-560.

10. The preparation method of a weather-resistant heat storage and heat preservation coating for energy storage devices according to claim 1, characterized in that, It includes the following steps: mixing a modified composite resin with a co-solvent by mass parts; then adding a weather-resistant filler and nano-ceria for mixing; then adding a heat-insulating filler and a pigment for mixing; then adding a nano-silica-coated composite energy storage material, a hydrophobic modified polyurethane leveling agent and a polyether modified silicone defoamer for mixing; and finally adding a silane coupling agent for mixing; Grinding, filtering, and finally mixing evenly to obtain a coating.

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