Weather-resistant energy storage device heat storage and heat preservation coating and preparation method thereof

Abstract

The present application relates to a kind of weather resistance energy storage device heat storage insulation coating and its preparation method, belong to the field of coating technology, using epoxy resin, organic silicon prepolymer, fluorocarbon resin, trifluoro propyl polydimethylsiloxane and other materials preparation modified composite resin, provide good film-forming property, adhesion, weather resistance, restraint and energy storage heat insulation property. Using paraffin, Ti3AlC2MAX phase ceramic material, palmitic acid, polyphosphocholine ethylene glycol acrylate preparation composite energy storage material, and by nanometer silica coating, obtain nanometer silica coating composite energy storage material, with weather resistance filler, heat insulation filler and other ingredients are used according to certain proportion, so that coating has good weather resistance, corrosion resistance, heat storage insulation performance, adhesion and mechanical properties etc.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of coatings, and particularly relates to a weather-resistant energy storage device heat storage and heat preservation coating and a preparation method thereof. BACKGROUND

[0002] During the operation of energy storage devices, the storage and release of energy are accompanied by changes in heat, and temperature has a significant impact on the performance, service life, and safety of energy storage devices. In some scenarios where the ambient temperature changes greatly, in order to ensure the performance and service life of the battery and prevent battery thermal runaway and other problems, heat storage and heat preservation 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 devices such as hot water storage tanks and phase change energy storage devices, coating heat storage and heat preservation coatings can effectively reduce heat loss to the surrounding environment, improve energy storage efficiency, reduce energy loss, and make thermal energy more effectively stored and utilized.

[0003] As a key material that can effectively regulate the temperature of energy storage devices, heat storage and heat preservation coatings have received extensive attention and research in recent years. Although traditional heat preservation coatings have certain heat insulation and heat preservation properties, they often have many limitations in the application scenarios of energy storage devices. On the one hand, they lack weather resistance and are difficult to adapt to complex and changing outdoor environments. Under the action of long-term ultraviolet radiation, rainfall erosion, and other harsh conditions, the molecular structure of traditional coatings is prone to degradation and aging, leading to coating powdering, peeling, and a sharp decline in heat preservation performance. For example, in an energy storage power station by the sea, ordinary heat preservation coatings may be severely corroded and damaged within a few months due to the erosion of high-salinity sea winds, and cannot continue to provide effective temperature protection for energy storage devices. On the other hand, traditional heat storage and heat preservation coatings have limited heat storage capacity. In addition, traditional coatings have deficiencies in compatibility with energy storage device shell materials, adhesion, and mechanical properties, and are prone to problems such as coating cracking and peeling, 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 heat preservation coatings. Not only do coatings need to have excellent weather resistance to work stably in various harsh environments for a long time and effectively resist the erosion of ultraviolet light, rainfall, and other factors, but they also need to have high-efficiency heat storage and heat preservation performance, and good adhesion. Developing high-performance energy storage device coatings has become a key problem that needs to be solved in the energy storage field. SUMMARY

[0005] The existing ordinary coating cannot meet the above use performance requirements of energy storage equipment well. The application provides a weather-resistant energy storage equipment heat storage and heat preservation coating and a preparation method thereof, which adopts modified composite resin to provide good film forming property, adhesion, weather resistance, constraint and energy storage and heat insulation, adopts nano-silicon dioxide coated composite energy storage material to store heat and keep warm, and uses weather-resistant fillers, heat insulation fillers and other components in a certain proportion, so that the coating has good weather resistance, corrosion resistance, heat storage and heat preservation performance, adhesion and mechanical properties and the like. The specific technical scheme is as follows:

[0006] A weather-resistant energy storage equipment heat storage and heat preservation coating, the coating comprises the following raw materials in mass fraction: 30-40 parts of modified composite resin, 20-25 parts of nano-silicon dioxide coated composite energy storage material, 12-18 parts of weather-resistant filler, 15-20 parts of heat insulation filler, 1-2 parts of silane coupling agent, 0.5-0.8 parts of hydrophobic modified polyurethane leveling agent, 1-2 parts of nano cerium oxide, 0.5-0.8 parts of polyether modified silicone defoaming agent, 2-5 parts of pigment and 45-90 parts of cosolvent.

[0007] In the above coating, the preparation method of the modified composite resin comprises the following steps: stirring and mixing epoxy resin and organic silicon prepolymer at a mass ratio of (1-1.5):(2-2.5) to obtain material A, then adding 8%-10% of the mass of material A of fluorocarbon resin and 4%-6% of the mass of material A of trifluoropropyl polydimethylsiloxane, stirring and reacting at 65-75 DEG C under nitrogen protection for 2-3 hours to obtain material B; adding 0.4%-0.6% of the mass of material B of dibutyltin dilaurate catalyst, heating to 80-90 DEG C and continuing to stir and react for 1-1.5 hours, and cooling to obtain the modified composite resin.

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

[0009] 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 and polyphosphocholine ethylene glycol acrylate according to a mass ratio of (4-6):(3-5):(3-5):(3-5) to obtain material C; adding 4%-6% of expandable graphite powder to the material C under stirring until uniform to obtain material D; preparing a modifier according to a mass ratio of tetraethyl orthosilicate: ethanol: hydrochloric acid solution = (1-1.5):(3-5):(0.1-0.2); adding the material D into the modifier according to a mass ratio of material D: modifier = (1-2):(30-40) under stirring, stirring for 2-3 hours, aging and polycondensation for 6-12 hours, vacuum drying, and sieving to obtain the nano-silica coated composite energy storage material.

[0010] In the preparation method of the nano-silica coated composite energy storage material, the melting temperature is 60-70 DEG C; the concentration of the hydrochloric acid solution is 0.5-1 mol / L; the vacuum drying is carried out at 80-85 DEG C until constant weight; and the mesh size of the sieve is 100-150.

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

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

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

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

[0015] The preparation method of the weather-resistant energy storage device heat storage and thermal insulation coating comprises the following steps: mixing a modified composite resin and a co-solvent according to mass fractions; then adding weather-resistant fillers and nano-cerium oxide for mixing; then adding heat-insulating fillers and pigments for mixing; then adding a nano-silica coated composite energy storage material, a hydrophobic modified polyurethane leveling agent and a polyether modified silicone defoaming agent for mixing; finally adding a silane coupling agent for mixing; grinding, filtering and finally mixing uniformly to obtain the coating.

[0016] The weather-resistant energy storage device heat storage and thermal insulation coating and the preparation method thereof have the following beneficial effects:

[0017] The application discloses a modified composite resin and a preparation method thereof. First, phenyl triethoxysilane and methyl triethoxysilane are mixed to prepare a silicone prepolymer. The two contain hydrolyzable ethoxyl groups, which can form silanol after hydrolysis, and then form a silicone polymer with a certain cross-linking structure, providing good weather resistance and flexibility for the resin. The epoxy resin is mixed with the silicone prepolymer. The epoxy resin contains epoxy groups, which can react with the active groups in the silicone prepolymer, so that the two are combined, and the epoxy resin has high strength and the characteristics of the silicone. Fluorocarbon resin and trifluoro propyl polydimethyl siloxane are added. The fluorocarbon resin has excellent weather resistance, corrosion resistance and low surface energy. The trifluoro propyl polydimethyl siloxane can further improve the weather resistance, hydrophobicity and flexibility of the resin, and can improve the compatibility of the components. The fluorocarbon resin and the trifluoro propyl polydimethyl siloxane can also participate in part of the cross-linking reaction, so that the system forms a certain structure, improves the stability of the resin structure, improves the heat insulation effect of the resin itself, and improves the energy storage stability of the energy storage material and improves the heat storage and heat preservation property. The dibutyltin dilaurate catalyst is used to promote the reaction to obtain the modified composite resin with excellent performance.

[0018] Through the composite modification of various resins and siloxanes, the product combines the weather resistance, hydrophobicity of silicone, the high strength of epoxy resin, and the high weather resistance and corrosion resistance of fluorocarbon resin, so that the modified composite resin has good stability, weather resistance, corrosion resistance and adhesion, and can be well combined with other components to effectively improve the heat storage and heat preservation property.

[0019] The application discloses a nano-silicon dioxide coated composite energy storage material and a preparation method thereof. Paraffin, Ti3AlC2 MAX phase ceramic material, palmitic acid and polyphosphocholine ethylene glycol acrylate are melt blended. The paraffin and the palmitic acid are phase change materials, which can absorb and release heat within a certain temperature range, and play a role in energy storage. The Ti3AlC2 MAX phase ceramic material can constrain the paraffin and the palmitic acid, improve the morphological stability of the coating during heat storage, improve the thermal shock resistance of the phase change material and the coating, prevent cracking caused by thermal expansion and cold contraction, reduce the service life, and the Ti3AlC2 MAX phase ceramic material has certain heat storage and heat preservation property, improved weather resistance and corrosion resistance. The polyphosphocholine ethylene glycol acrylate can improve the compatibility and stability of the material, and realize good synthesis of the material. Expandable graphite powder is added, which has high specific surface area and good thermal conductivity, and can improve the thermal conductivity and energy storage performance of the material. A modifier is prepared. Tetraethyl orthosilicate is hydrolyzed to form silicon dioxide under the action of ethanol and hydrochloric acid aqueous solution. In a stirring state, the material D is added to the modifier. The silicon dioxide is coated on the surface of the material D to form a nano-silicon dioxide coated structure, and the stability, weather resistance and heat insulation of the material are improved.

[0020] Through the synergistic effect of the components, the product has good heat storage performance, can quickly absorb and release heat, and at the same time, the Ti3AlC2 MAX phase ceramic material, the polyphosphocholine ethylene glycol acrylate and the nano silicon dioxide coating are used in cooperation, the stability, weather resistance and heat insulation of the heat storage material are improved, so that it can stably play the heat storage and heat preservation role in different environments, and has good thermal shock resistance, preventing the coating from cracking due to thermal expansion and cold contraction.

[0021] Thirdly, the modified composite resin of the present application provides good film forming property, adhesion, weather resistance, restraint and energy storage and heat insulation; the nano silicon dioxide coated composite energy storage material is mainly responsible for heat storage and heat preservation; the weather resistant filler glass powder and nano boron nitride improve the weather resistance and wear resistance of the coating; the heat insulation filler hydrophobic aerogel powder and far infrared ceramic powder reduce heat loss; the components cooperate with each other, so that the coating has good weather resistance, corrosion resistance, heat storage and heat preservation performance, adhesion and mechanical properties, etc., and has good practical value. DETAILED DESCRIPTION

[0022] The present application will be further described below in combination with specific implementation examples, but the present application is not limited to these examples.

[0023] Example 1

[0024] A weather-resistant energy storage device heat storage and heat preservation coating, the coating comprises the following mass fractions of raw materials: 35 parts of modified composite resin, 22 parts of nano silicon dioxide 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 parts of hydrophobic modified polyurethane leveling agent, 1.5 parts of nano cerium oxide, 0.6 parts of polyether modified silicone defoaming agent, 3 parts of pigment and 68 parts of cosolvent.

[0025] The preparation method of the modified composite resin comprises the following steps: phenyltriethoxysilane and methyltriethoxysilane are mixed at a mass ratio of 3:1, stirred at 250 r / min for 35 min, and an organic silicon prepolymer is prepared; epoxy resin and the organic silicon prepolymer are mixed at a mass ratio of 1.2:2.3, stirred at 350 r / min for 40 min to obtain material A, then 9% of the mass of material A of fluorocarbon resin and 5% of the mass of material A of trifluoropropyl polydimethylsiloxane are added, and the mixture is stirred at 350 r / min at 70℃ under nitrogen protection for 2.5 h to obtain material B; under nitrogen protection, 0.5% of the mass of material B of dibutyltin dilaurate catalyst is added, the temperature is raised to 85℃, and the stirring is continued at 350 r / min for 1 h, and then the temperature is lowered to room temperature to obtain the modified composite resin.

[0026] The preparation method of the nano-silicon dioxide coated composite energy storage material includes the following steps: melting and blending 5 parts of paraffin wax, 4 parts of Ti3AlC2 MAX phase ceramic material, 4 parts of palmitic acid, and 4 parts of polyphosphocholine ethylene glycol acrylate at 65°C and 250 r / min for 45 min to obtain material C; under the condition of 250 r / min stirring, 5% expandable graphite powder of the mass of the material C is added, and 250 r / min mixing is performed for 25 min to obtain material D; 1.3 parts of tetraethyl orthosilicate, 4 parts of ethanol, and 0.15 parts of hydrochloric acid aqueous solution are prepared to prepare a modifier, wherein the concentration of the hydrochloric acid aqueous solution is 0.8 mol / L; under the condition of 250 r / min stirring, the material D is added into the modifier according to the mass ratio of 1.5:35, 250 r / min stirring is performed for 2.5 h, aging and polycondensation are performed for 8 h, vacuum drying is performed at 82°C until the weight is constant, 150 mesh screen is used for screening, and the undersize material is obtained to obtain the nano-silicon dioxide coated composite energy storage material.

[0027] 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-mentioned weather-resistant energy storage device heat storage and heat preservation coating includes the following steps: mixing the modified composite resin and the co-solvent according to the mass fraction, and stirring at 350 r / min for 15 min; then adding the weather-resistant filler and nano-cerium oxide for mixing, and high-speed dispersing at 3500 r / min for 35 min; then adding the heat-insulating filler and the pigment for mixing, and high-speed dispersing at 1500 r / min for 15 min; then adding the nano-silicon dioxide coated composite energy storage material, the hydrophobic modified polyurethane leveling agent, and the polyether modified silicone defoaming agent for mixing, and stirring at 500 r / min for 15 min; finally adding the silane coupling agent and stirring at 350 r / min for 15 min; grinding, 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, and the final mixture is uniformly filtered through a 200 mesh screen 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 mass fractions of raw materials: 30 parts of modified composite resin, 20 parts of nano-silicon dioxide 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 parts of hydrophobic modified polyurethane leveling agent, 1 part of nano-cerium oxide, 0.5 parts of polyether modified silicone defoaming agent, 2 parts of pigment, and 45 parts of co-solvent.

[0031] The preparation method of the modified composite resin comprises the following steps: phenyl triethoxysilane and methyl triethoxysilane are mixed at a mass ratio of 3:1 and stirred at 200 r / min for 30 min to prepare a silicone prepolymer; epoxy resin and the silicone prepolymer are mixed at a mass ratio of 1:2 and stirred at 300 r / min for 30 min to obtain material A; then 8% of the mass of the material A of fluorocarbon resin and 4% of the mass of the material A of trifluoropropyl polydimethylsiloxane are added, and the mixture is stirred at 300 r / min at 65 DEG C for 2 h under nitrogen protection to obtain material B; then 0.4% of the mass of the material B of dibutyltin dilaurate catalyst is added under nitrogen protection, the temperature is increased to 80 DEG C, and the mixture is continuously stirred at 300 r / min for 1 h, and then the mixture is cooled to room temperature to obtain the modified composite resin.

[0032] The preparation method of the nano-silicon dioxide coated composite energy storage material comprises the following steps: paraffin, Ti3AlC2 MAX phase ceramic material, palmitic acid and polyphosphocholine ethylene glycol acrylate are mixed at a mass ratio of 4:3:3:5, and then the mixture is melt-blended at 60 DEG C and 200 r / min for 30 min to obtain material C; then 4% of the mass of the material C of expandable graphite powder is added under stirring at 200 r / min, and the mixture is mixed at 200 r / min for 20 min to obtain material D; a modifier is prepared by mixing tetraethyl orthosilicate, ethanol and hydrochloric acid aqueous solution at a mass ratio of 1:3:0.1, wherein the concentration of the hydrochloric acid aqueous solution is 0.5 mol / L; then the material D is added into the modifier under stirring at 200 r / min, and the mixture is stirred at 200 r / min for 2 h, and then the mixture is aged and polycondensed for 6 h; finally, the mixture is dried at 80 DEG C under vacuum until the weight is constant, and then the mixture is sieved through a 100-mesh screen to obtain the nano-silicon dioxide coated composite energy storage material.

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

[0034] The preparation method of the weather-resistant energy storage device heat storage and heat preservation coating comprises the following steps: mixing modified composite resin and cosolvent according to the mass fraction, stirring at 300 r / min for 10 min; then adding weather-resistant fillers and nano cerium oxide for mixing, high-speed dispersion at 3000 r / min for 30 min; then adding heat insulation fillers and pigments for mixing, high-speed dispersion at 1000 r / min for 10 min; then adding nano-silicon dioxide coated composite energy storage material, hydrophobic modified polyurethane leveling agent and polyether modified silicone defoaming agent for mixing, stirring at 400 r / min for 10 min; finally adding silane coupling agent, stirring at 300 r / min for 10 min; grinding, the grinding medium is selected as zirconium oxide with a particle size of 0.3 mm, the grinding speed is 1500 rpm; the feeding speed is 3 L / min, filtered through a 150 mesh screen, and finally uniformly mixed 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 mass fraction of raw materials: 40 parts of modified composite resin, 25 parts of nano-silicon dioxide coated composite energy storage material, 18 parts of weather-resistant fillers, 20 parts of heat insulation fillers, 2 parts of silane coupling agent, 0.8 parts of hydrophobic modified polyurethane leveling agent, 2 parts of nano cerium oxide, 0.8 parts of polyether modified silicone defoaming agent, 5 parts of pigment and 90 parts of cosolvent.

[0037] The preparation method of the modified composite resin comprises the following steps: phenyltriethoxysilane and methyltriethoxysilane are mixed at a mass ratio of 3:1.2, stirred at 300 r / min for 40 min to prepare an organic silicon prepolymer; epoxy resin and the organic silicon prepolymer are mixed at a mass ratio of 1.5:2.5, stirred at 400 r / min for 45 min to obtain material A, then 10% of the mass of material A of fluorocarbon resin and 6% of the mass of material A of trifluoropropyl polydimethylsiloxane are added, and the mixture is stirred at 400 r / min under nitrogen protection at 75℃ for 3 h to obtain material B; under nitrogen protection, 0.6% of the mass of material B of dibutyltin dilaurate catalyst is added, the temperature is raised to 90℃, and the mixture is continuously stirred at 400 r / min for 1.5 h, and then cooled to room temperature to obtain the modified composite resin.

[0038] The preparation method of the nano-silicon dioxide coated composite energy storage material includes the following steps: melting and blending paraffin, Ti3AlC2 MAX phase ceramic material, palmitic acid, and polyphosphocholine ethylene glycol acrylate at a mass ratio of 6:5:5:3 at 70 DEG C and 300 r / min for 60 min to obtain material C; adding 6% expandable graphite powder to the material C under stirring at 300 r / min, and mixing at 300 r / min for 30 min to obtain material D; preparing a modifier by mixing tetraethyl orthosilicate, ethanol, and hydrochloric acid aqueous solution at a mass ratio of 1.5:5:0.2, wherein the concentration of the hydrochloric acid aqueous solution is 1 mol / L; adding the material D to the modifier under stirring at 300 r / min at a mass ratio of 2:40, stirring at 300 r / min for 3 h, aging and condensation for 12 h, vacuum drying at 85 DEG C until the weight is constant, and screening through a 150-mesh screen to obtain the nano-silicon dioxide coated composite energy storage material.

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

[0040] The preparation method of the weather-resistant energy storage device heat storage and heat preservation coating includes the following steps: mixing the modified composite resin and the co-solvent at a mass ratio of 400 r / min for 20 min; then adding the weather-resistant filler and nano-cerium oxide for mixing, and high-speed dispersing at 4000 r / min for 40 min; then adding the heat-insulating filler and the pigment for mixing, and high-speed dispersing at 2000 r / min for 20 min; then adding the nano-silicon dioxide coated composite energy storage material, the hydrophobic modified polyurethane leveling agent, and the polyether modified organosilicon defoaming agent for mixing, and stirring at 600 r / min for 20 min; finally adding the silane coupling agent for stirring at 400 r / min for 20 min; grinding, wherein 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, and the final mixture is filtered through a 200-mesh screen to obtain the coating.

[0041] In the above embodiments, the phenyltriethoxysilane is from Shanghai Aojijin Chemical Co., Ltd. The methyltriethoxysilane is from Jinan Zhiiyancheng Chemical Co., Ltd. The epoxy resin is from Wuxi Qian Guang Chemical Raw Material Co., Ltd., model E-446101, viscosity 20000 mPas. The fluorocarbon resin is FEVE type fluorocarbon resin, from Xiamen Aikema Chemical Co., Ltd., model ZHM-2. The trifluoropropyl polydimethylsiloxane is from Shenzhen Jipeng Silicon Fluorine Material Co., Ltd. The dibutyltin dilaurate catalyst is from Jinan Haiyuan Chemical Co., Ltd. The paraffin wax is from Shijiazhuang Bojian Fine Chemical Co., Ltd., paraffin wax 54#, melting point below 56℃. The Ti3AlC2 MAX phase ceramic material is from Qinghe County Benyu Metal Material Co., Ltd., model BY-Ti3ALC2, particle size 400 mesh. The palmitic acid is from Shandong Yijia Chemical Co., Ltd. The polyphosphocholine ethylene glycol acrylate is from Hubei Jiahui Xingcheng Biological Technology Co., Ltd. The expandable graphite powder is from Qingdao Pingdu Fukang Graphite Processing Factory, model 300 mesh colloidal graphite. The tetraethyl orthosilicate is from Jinan Duoweiqiao Chemical Co., Ltd. The glass powder is from Guangdong Qicheng New Material Technology Co., Ltd., model D233, 2000 mesh. The nano boron nitride is from Shanghai Pantian Powder Material Co., Ltd., model PT-BN-500nm. The hydrophobic aerogel powder is from Fosman Technology (Beijing) Co., Ltd., below 20μm. The far infrared ceramic powder is from Shijiazhuang Sizhou New Material Co., Ltd., nanoscale. The silane coupling agent is silane coupling agent KH-560, from Dongguan Kangjin New Material Technology Co., Ltd. The hydrophobic modified polyurethane leveling agent is from Dongguan Bogao Chemical Co., Ltd., product number BG95. The nano cerium oxide is from Hangzhou Jiupeng New Material Co., Ltd. The polyether modified silicone defoamer is from Shanghai Huiren New Material Co., Ltd., model HY-6803. The propylene glycol methyl ether acetate is from Shandong Jinyueyuan New Material Co., Ltd. The methyl isobutyl ketone is from Langcheng Chemical Co., Ltd.

[0042] Comparative Example 1

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

[0044] Comparative Example 2

[0045] In the preparation method of the modified composite resin, no trifluoropropyl polydimethylsiloxane is added; other parameters and methods are the same as in Example 1.

[0046] Comparative Example 3

[0047] In the preparation method of the modified composite resin, no fluorocarbon resin is added; other parameters and methods are the same as in Example 1.

[0048] Comparative Example 4

[0049] The preparation method of the nano-silica coated composite energy storage material does not add polyphosphocholine ethylene glycol acrylate; other parameters and methods are the same as in Example 1.

[0050] Comparative Example 5

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

[0052] The performance of each of the above coatings is detected.

[0053] 1. Xenon lamp aging test: the pigment of the coating sample is titanium dioxide, the coating is coated on a 150 mm x 70 mm x 3 mm aluminum plate, cured, the coating thickness is 150 μm, and a sample is obtained. The sample is placed in a xenon lamp aging test box, the test conditions are set as light intensity 1000 W / m 2 , blackboard temperature 45℃, relative humidity 65%, rainfall cycle 18min / 102min (rainfall time / non-rainfall time), simulating the dry-wet cycle in the natural environment, and the sample is taken out after 1500 hours to observe phenomena such as powdering, cracking, and peeling, and aging rating is performed. The detection results are shown in Table 1 below.

[0054] Aging rating standards:

[0055]

[0056] 2. Salt spray corrosion test: the pigment of the coating sample is titanium dioxide, the coating is coated on a 150 mm x 70 mm x 3 mm aluminum plate, cured, the coating thickness is 150 μm, and a sample is obtained. A 5% sodium chloride solution is prepared, and the pH value is 6.8. The sample is placed in a salt spray test box, the sample is at an angle of 30° to the vertical direction, the test temperature is set to 35℃, and continuous spraying is performed, and the sample is taken out after 1500 hours to observe whether phenomena such as blistering, cracking, and peeling occur, and corrosion rating is performed. The detection results are shown in Table 1 below.

[0057] Corrosion rating standards:

[0058]

[0059]

[0060] 3. Heat storage and heat preservation performance test:

[0061] A 10L stainless steel storage tank (wall thickness 1.5mm) is coated with a coating of 3mm on the outer surface, the environmental temperature is 25℃, the storage tank is filled with 60℃ warm water; the time in minutes required for the water temperature to drop to 30℃ is recorded. The detection results are shown in Table 1 below.

[0062] 4. Adhesion test: The paint sample pigment is selected as titanium dioxide. The paint is coated on a 150 mm x 70 mm x 3 mm aluminum plate, cured, and the coating thickness is 200 μm to obtain a sample. A ruler is used to draw 100 small squares with a side length of 1 mm vertically on the coating surface with uniform force. During the drawing process, the cutter must be completely cut into the coating to the substrate surface. A soft brush is used to gently brush 5 times along the diagonal direction of the square to remove the debris generated by the drawing. A standard adhesive tape with an adhesion of 3 N / cm is selected and attached to the drawn square. The adhesive tape is pressed from one end to the other end with the fingers to ensure that the adhesive tape is in full contact with the coating without bubbles and wrinkles. The adhesive tape is quickly torn off at an angle of about 90°, and the square coating is observed to determine the adhesion rating. The test results are shown in Table 1 below.

[0063] Adhesion rating standard:

[0064] Rank Description of Phenomenon 5B Cutting edge completely smooth, no grid loss; 4B A little coating loss at the intersection of the cut, but the loss area is not more than 5%; 3B Coating loss is obvious at the intersection of the cut, but the loss area is not more than 15%; 2B Coating loss along the edge of the cut, the loss area is not more than 35%; 1B Coating loss along the edge of the cut, the loss area is not more than 65%; 0B Loss area > 65%

[0065] Table 1 test results

[0066]

[0067]

[0068] From the above results, it can be seen that the paint prepared in Examples 1 to 5 has good weather resistance, corrosion resistance, heat storage and heat preservation capacity, and good adhesion, and has a long service life.

[0069] In Comparative Example 1, the epoxy resin is directly used to replace the modified composite resin. The epoxy resin itself lacks the excellent weather resistance and corrosion resistance possessed by silicone and fluorocarbon resin. The silicone component can enhance the flexibility and ultraviolet resistance of the resin, and the 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 the epoxy resin is easily degraded and broken under long-term ultraviolet irradiation, resulting in a large number of bubbles, severe powdering, cracking and peeling of the coating, and a low aging rating. In the salt spray corrosion test, the epoxy resin cannot effectively resist salt spray corrosion, and rusting and bubbling are serious, and the corrosion rating is also low. From the perspective of thermal performance, the molecular structure of the epoxy resin determines that its thermal conductivity is relatively high, which is not conducive to heat storage and heat preservation. At the same time, the adhesion of the epoxy resin to the aluminum plate is relatively weak, and the coating at the drawn square is easily peeled off.

[0070] The modified composite resin preparation of Comparative Example 2 does not add trifluoropropyl polydimethylsiloxane. Trifluoropropyl polydimethylsiloxane can significantly improve the flexibility and chemical corrosion resistance of the resin. After missing this component, the stability of the resin is reduced when facing harsh environments such as ultraviolet light and salt spray. In terms of thermal performance, trifluoropropyl polydimethylsiloxane optimizes the overall heat conduction, and the heat storage and insulation performance decreases, and the water temperature cooling time is shortened. However, due to the role of other components such as fluorocarbon resin, the performance decline is not as obvious as Comparative Example 1. In terms of adhesion, it has a certain auxiliary effect on the combination of the coating and the substrate, and the lack of it makes the adhesion slightly lower.

[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 performance stability of the coating in harsh environments. After missing fluorocarbon resin, the modified composite resin's resistance to ultraviolet light and chemical corrosion is reduced. Fluorocarbon resin also contributes to the optimization of the overall thermal performance of the coating, and its absence leads to changes in the cross-linking structure, resulting in a decrease in heat storage and insulation performance. In terms of adhesion, the cross-linking structure formed with fluorocarbon resin helps to enhance the bonding force between the coating and the substrate, and the lack of it affects the adhesion to some extent.

[0072] Comparative Example 4 does not add polyphosphocholine ethylene glycol acrylate in the preparation of nanometer silica-coated composite energy storage material. Polyphosphocholine 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, and in the heat storage and insulation performance test, the time required for the water temperature to drop from 60°C to 40°C is shortened due to the energy storage material's inability to effectively store and release heat to maintain temperature stability. However, the impact on the coating's weather resistance, corrosion resistance, and adhesion is relatively small, as these properties of the coating are mainly ensured by other components such as resin, filler, and additives. Therefore, there is no obvious change in appearance during aging and corrosion testing, and the adhesion rating is still 5B.

[0073] Comparative Example 5 does not add Ti3AlC2 MAX phase ceramic material in the preparation of nanometer silica-coated composite energy storage material. The restraining ability of paraffin and palmitic acid decreases, and the heat storage efficiency of Ti3AlC2 MAX phase ceramic material is missing, resulting in a decrease in the overall energy storage material's performance, and a fundamental change in the structure of the energy storage material, affecting the heat storage and insulation effect of the coating, and reducing the weather resistance, corrosion resistance, and adhesion.

Claims

1. A weather-resistant thermal insulation coating for energy storage equipment, characterized in that, The coating comprises the following raw materials in parts by weight: 30 to 40 parts modified composite resin, 20 to 25 parts nano-silica coated composite energy storage material, 12 to 18 parts weather-resistant filler, 15 to 20 parts heat-insulating filler, 1 to 2 parts silane coupling agent, 0.5 to 0.8 parts hydrophobic modified polyurethane leveling agent, 1 to 2 parts nano-cerium oxide, 0.5 to 0.8 parts polyether modified silicone defoamer, 2 to 5 parts pigment, and 45 to 90 parts co-solvent; The preparation method of the modified composite resin includes the following steps: epoxy resin and organosilicon prepolymer are mixed at a mass ratio of (1-1.5):(2-2.5) to obtain material A; 8%-10% of fluorocarbon resin and 4%-6% of trifluoropropyl polydimethylsiloxane are added to material A; under nitrogen protection, the mixture is stirred and reacted at 65℃-75℃ for 2-3 hours to obtain material B; 0.4%-0.6% of dibutyltin dilaurate catalyst is added to material B; the temperature is raised to 80℃-90℃ and the mixture is stirred and reacted for 1-1.5 hours; the temperature is then lowered to obtain the modified composite resin. The preparation method of the nano-silica-coated composite energy storage material includes the following steps: Paraffin wax:Ti3AlC2 MAX phase ceramic material:palmitic acid:polyphosphocholine glycol acrylate = (4-6):(3-5):(3-5):(3-5) mass ratio is melted to obtain material C. Under stirring, 4%-6% by mass of expandable graphite powder of material C is added and mixed until uniform to obtain material D. A modifier is prepared 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). The mixture is stirred for 2-3 hours, aged and polycondensed for 6-12 hours, vacuum dried, and sieved to obtain the nano-silica-coated composite energy storage material. The weather-resistant filler has a glass powder to nano boron nitride mass ratio of (3-3.5):(1-1.5). The thermal insulation filler is a mixture of hydrophobic aerogel powder and far-infrared ceramic powder in a mass ratio of (2-2.5):(1-1.5). The co-solvent is propylene glycol methyl ether acetate to methyl isobutyl ketone in a mass ratio of (1-2):(1-1.5). The silane coupling agent is silane coupling agent KH-560.

2. The weather-resistant thermal insulation coating for energy storage equipment according to claim 1, characterized in that, In the preparation method of the modified composite resin, the organosilicon prepolymer is prepared by mixing phenyltriethoxysilane and methyltriethoxysilane in a mass ratio of 3:(1-1.2).

3. The weather-resistant thermal insulation coating for energy storage equipment according to claim 1, characterized in that, In the preparation method of nano-silica coated composite energy storage material, the melting temperature is 60℃~70℃; the concentration of the hydrochloric acid aqueous solution is 0.5mol / L~1mol / L; the vacuum drying is carried out at 80℃~85℃ until constant weight; and the sieve mesh size is 100 mesh~150 mesh.

4. The method for preparing a weather-resistant thermal insulation coating for energy storage equipment as described in claim 1, characterized in that, The process includes the following steps: mixing the modified composite resin with a co-solvent according to the mass fraction; then adding weather-resistant filler and nano-cerium oxide and mixing; then adding heat-insulating filler and pigment and mixing; then adding nano-silica-coated composite energy storage material, hydrophobic modified polyurethane leveling agent and polyether modified silicone defoamer and mixing; finally adding silane coupling agent and mixing. Grind, filter, and finally mix evenly to obtain the coating.

Images