Two-component paint, coating and battery cell storage equipment

Abstract

The invention provides a two-component coating, a coating and battery cell storage equipment. The double-component coating comprises a first component and a second component, the first component comprises water-based hydroxyl type acrylic resin and inorganic filler, and the inorganic filler comprises one or more of titanium dioxide and glass beads; the second component comprises a water-based isocyanate curing agent. The coating prepared from the two-component coating has excellent electrical insulation, heat reflection and heat insulation performance, and the risks of electric leakage and thermal runaway of the battery cell storage equipment can be reduced.

Description

Technical Field

[0001] The present application relates to the technical field of secondary batteries, and particularly to a two-component coating, a coating, and a core storage device. Background Art

[0002] In recent years, secondary batteries have been widely used in energy storage power systems such as hydraulic power plants, thermal power plants, wind power plants, and solar power plants, as well as in multiple fields such as power tools, electric bicycles, electric motorcycles, electric vehicles, military equipment, and aerospace.

[0003] With the popularization of the application of secondary batteries in the energy storage field and the expansion of the application scenarios of core storage devices, it has become an urgent task to manage the potential risks existing in core storage devices. Summary of the Invention

[0004] The present application is made in view of the above problems, and its purpose is to provide a two-component coating. The coating prepared from the two-component coating has excellent electrical insulation, heat reflection, and heat insulation properties, and can reduce the risks of electric leakage and thermal runaway of the core storage device.

[0005] The first aspect of the present application provides a two-component coating, which includes a first component and a second component. The first component includes a water-based hydroxyl acrylic resin and inorganic fillers, and the inorganic fillers include one or more of titanium dioxide and glass microspheres; the second component includes a water-based isocyanate curing agent.

[0006] The two-component coating is composed of a first component containing a hydroxyl acrylic resin and a second component containing an isocyanate curing agent. The hydroxyl group in the hydroxyl acrylic resin reacts with the isocyanate group of the isocyanate curing agent to form a urethane bond. A type of polymer material containing repeating urethane structural units is called polyurethane. Polyurethane has a low thermal conductivity and can improve the heat insulation performance of the coating prepared from the two-component coating. Moreover, the polyurethane synthesized from the two-component coating has a high crosslinking density, and the coating has the advantages of high mechanical strength, strong adhesion, water resistance, and solvent resistance, and can extend the service life of the coating.

[0007] The first component of the two-component coating also contains inorganic fillers. Among them, titanium dioxide has excellent reflection ability for sunlight, and glass microspheres have low thermal conductivity and electrical insulation, which can make the coating have excellent heat reflection and electrical insulation properties, and can further improve the heat insulation performance of the coating. Spraying the two-component coating of the present application on the surface of the core storage device body can obtain a coating with excellent heat reflection, heat insulation, and electrical insulation properties, reducing the risks of thermal runaway and electric leakage of the core storage device. Moreover, the two-component coating uses a water-based solvent as the dispersion medium, and has the advantages of low cost, convenient operation, non-flammability, environmental protection, non-toxicity, and safety, and is suitable for industrial applications in the field of core storage device coatings.

[0008] In any embodiment, the titanium dioxide includes rutile titanium dioxide.

[0009] Compared with other titanium dioxides, rutile titanium dioxide has a higher sunlight reflectivity, which is beneficial to further improving the thermal reflection performance of the coating and reducing the risk of thermal runaway in the cell storage device.

[0010] In any embodiment, based on the total mass of the first component, the mass ratio of the titanium dioxide is 5%-10%.

[0011] Based on the total mass of the first component, when the mass ratio of the titanium dioxide is within the above range, the two-component coating has a viscosity suitable for construction, and the coating has excellent thermal reflection performance, which can reduce the risk of thermal runaway in the cell storage device.

[0012] In any embodiment, the titanium dioxide includes a first titanium dioxide and a second titanium dioxide; wherein, the average particle size Dv50 of the first titanium dioxide is smaller than the average particle size Dv50 of the second titanium dioxide.

[0013] The total energy of visible light and infrared light accounts for about 95% of the total energy of sunlight. Selecting titanium dioxides with different particle size distributions enables them to have a reflective effect on visible light and infrared light respectively, thereby effectively improving the sunlight reflectance, hemispherical emissivity, and near-infrared light reflectance of the coating, making the coating have excellent thermal reflection performance, which is beneficial to reducing the risk of thermal runaway in the cell storage device.

[0014] In any embodiment, the average particle size Dv50 of the first titanium dioxide is 0.3 μm - 0.6 μm.

[0015] In any embodiment, the average particle size Dv50 of the second titanium dioxide is 0.6 μm - 1.0 μm.

[0016] In any embodiment, the glass microspheres include hollow glass microspheres, and the average particle size Dv50 of the hollow glass microspheres is 5 μm - 10 μm.

[0017] The hollow glass microspheres have a lower thermal conductivity and excellent electrical insulation performance. The inclusion of hollow glass microspheres in the two-component coating can further improve the heat insulation performance and electrical insulation performance of the coating, thereby reducing the risks of thermal runaway and electric leakage in the cell storage device. When the particle size of the hollow glass microspheres is within the above range, the two-component coating has a viscosity suitable for construction, and the coating has excellent heat insulation performance and electrical insulation performance.

[0018] In any embodiment, the molar ratio of the hydroxyl group in the first component to the isocyanate group in the second component is 1:1.3 - 1:1.5.

[0019] In any embodiment, the inorganic filler further includes one or more of mica powder, calcium carbonate, kaolin, wollastonite, talc powder, and barium sulfate.

[0020] The first component of the two-component coating contains inorganic filler, which can further enhance the thermal reflection, heat insulation, and electrical insulation properties of the coating, reducing the risks of thermal runaway and electric leakage in the battery cell storage device. Moreover, the addition of the inorganic filler can also reduce the cost of the two-component coating, making it suitable for the industrial application of the two-component coating in the field of battery cell storage device coatings.

[0021] In any embodiment, the first component further includes additives. Optionally, the additives include one or more of wetting agents, dispersants, leveling agents, film-forming aids, defoamers, pH regulators, and thickeners.

[0022] In any embodiment, the wetting agent includes one or more of alkynediols, hydrophobically modified acrylate salts, and polyether-modified polysiloxanes.

[0023] In any embodiment, the dispersant includes one or more of polyphosphates, sodium polyacrylate salts, and ammonium polyacrylate salts.

[0024] In any embodiment, the leveling agent includes one or more of polyether-modified silicone polymers, acrylate polymers, and fluorine-modified acrylate polymers.

[0025] In any embodiment, the film-forming aid includes one or more of Texanol, ethylhexyl lactate, and isodecyl lactate.

[0026] In any embodiment, the defoamer includes one or more of mineral oil defoamers and silicone defoamers.

[0027] In any embodiment, the pH regulator includes one or more of 2-amino-2-methyl-1-propanol and ammonia water.

[0028] In any embodiment, the thickener includes one or more of associative polyacrylate alkali-swellable types, non-associative polyacrylate alkali-swellable types, and hydrophobically modified associative polyurethanes.

[0029] In any embodiment, the waterborne hydroxyl acrylic resin includes one or more of waterborne organosilicon-modified hydroxyl acrylic resins and waterborne organofluorine-modified hydroxyl acrylic resins.

[0030] Modifying the acrylic resin with silicon-containing or fluorine-containing monomers or intermediates can enhance the corrosion resistance, aging resistance, and stain resistance of the coating, achieving the protection of battery cell storage devices in various application scenarios such as outdoor environments and high-salt fog environments. Moreover, organosilicon or organofluorine has good insulation properties, which can further enhance the electrical insulation properties of the coating.

[0031] In any embodiment, the aqueous isocyanate curing agent includes one or more of hexamethylene diisocyanate and its prepolymer, polymethylene polyphenyl polyisocyanate and its prepolymer, diphenylmethane diisocyanate prepolymer, carbodiimide-modified diphenylmethane diisocyanate prepolymer, isophorone diisocyanate prepolymer, toluene diisocyanate prepolymer, xylene diisocyanate prepolymer, phenylene diisocyanate and its prepolymer, dimethoxyaniline isocyanate and its prepolymer, alkylated benzene diisocyanate prepolymer and its prepolymer.

[0032] In any embodiment, the second component further includes a diluent, and the diluent includes one or more of propylene glycol methyl ether acetate, ethyl acetate, and butyl acetate.

[0033] In any embodiment, based on the total mass of the first component, the first component includes an aqueous hydroxy acrylic resin emulsion with a mass fraction of 20% - 80%, an inorganic filler with a mass fraction of 5% - 25%, an auxiliary agent with a mass fraction of 1% - 15%, and an aqueous solvent with a mass fraction of 1% - 60%; based on the total mass of the second component, the second component includes an aqueous isocyanate curing agent with a mass fraction of 50% - 90% and a diluent with a mass fraction of 10% - 50%.

[0034] In any embodiment, based on the total mass of the first component, the first component includes an aqueous hydroxy acrylic resin emulsion with a mass fraction of 40% - 60%, a first titanium dioxide with a mass fraction of 2.5% - 5%, a second titanium dioxide with a mass fraction of 2.5% - 5%, glass microspheres with a mass fraction of 1% - 2%, other inorganic fillers with a mass fraction of 3% - 6%, a wetting agent with a mass fraction of 0.1% - 0.2%, a dispersant with a mass fraction of 0.2% - 0.3%, a leveling agent with a mass fraction of 0.5% - 1.0%, a film-forming auxiliary agent with a mass fraction of 2.5% - 3.5%, an antifoaming agent with a mass fraction of 0.1% - 0.5%, a pH regulator with a mass fraction of 0.1% - 0.5%, a thickener with a mass fraction of 0.3% - 0.5%, and an aqueous solvent with a mass fraction of 15% - 50%; based on the total mass of the second component, the second component includes an aqueous isocyanate curing agent with a mass fraction of 65% - 75% and a diluent with a mass fraction of 25% - 35%.

[0035] When the mass fractions of the components of the first component and the second component of the two-component coating are within the above ranges, the coating prepared from the two-component coating has excellent heat reflection, heat insulation, and electrical insulation properties, and can reduce the risks of thermal runaway and electric leakage of the battery cell storage device. Moreover, the waterborne two-component coating uses an aqueous solvent as the dispersion medium, and has the advantages of environmental protection, low cost, and convenient operation, and is suitable for industrial applications in the field of battery cell storage device coatings.

[0036] The second aspect of the present application provides a coating, which is prepared from the two-component coating of the first aspect.

[0037] In any embodiment, the thickness of the coating is 100 μm - 150 μm.

[0038] When the thickness of the coating is within the above range, during the construction of the main body of the battery cell storage device, the coating is not likely to sag, and while having excellent heat reflection, heat insulation and electrical insulation properties, the construction cost can be reduced.

[0039] In any embodiment, the solar reflectance of the coating is greater than or equal to 0.8.

[0040] In any embodiment, the hemispherical emissivity of the coating is greater than or equal to 0.8.

[0041] In any embodiment, the near-infrared reflectance of the coating is greater than or equal to 0.8.

[0042] In any embodiment, the dielectric strength of the coating is greater than or equal to 45 kV / mm.

[0043] In any embodiment, the thermal conductivity of the coating is less than or equal to 0.1 W / (m·K).

[0044] In any embodiment, the volume resistivity of the coating is greater than or equal to 1×10 15 Ω·cm.

[0045] In any embodiment, the solar reflectance of the coating is 0.9 - 0.99.

[0046] In any embodiment, the hemispherical emissivity of the coating is 0.9 - 0.99.

[0047] In any embodiment, the near-infrared reflectance of the coating is 0.9 - 0.99.

[0048] In any embodiment, the volume resistivity of the coating is greater than or equal to 1×10 16 Ω·cm.

[0049] The third aspect of the present application provides a battery cell storage device, including a main body and a coating disposed at least partially on the surface of the main body, and the coating is as described in the second aspect.

[0050] The battery cell storage device integrates components such as a body, a battery pack, a battery management system, an inverter, and electronic components. It has the advantages of being economical and efficient, flexible and convenient, and optimizing the energy structure. It is applicable to new energy fields such as photovoltaic, wind power, and nuclear power, and has a wide range of application scenarios. The battery cell storage device has a coating prepared according to the present application, at least part of which is disposed on the surface of the body. The coating has excellent electrical insulation, heat reflection, and heat insulation properties, and can reduce the risks of electric leakage and thermal runaway of the battery cell storage device.

[0051] In any implementation, the body includes one or more of stainless steel, aluminum, and aluminum alloy. Specific implementation

[0052] Hereinafter, embodiments of the two-component coating, coating, and battery cell storage device of the present application are specifically described in detail. However, there may be cases where unnecessary details are omitted. For example, there are cases where details of well-known matters are omitted and repeated descriptions of actually identical structures are omitted. This is to prevent the following description from becoming unnecessarily long and to facilitate the understanding of those skilled in the art. In addition, the following description is provided for those skilled in the art to fully understand the present application and is not intended to limit the subject matter recited in the claims.

[0053] The "range" disclosed in the present application is defined in the form of a lower limit and an upper limit. A given range is defined by selecting a lower limit and an upper limit, and the selected lower limit and upper limit define the boundary of a specific range. The ranges defined in this way can include the end values or not include the end values, and can be combined arbitrarily, that is, any lower limit can be combined with any upper limit to form a range. For example, if ranges of 60 - 120 and 80 - 110 are listed for a specific parameter, ranges of 60 - 110 and 80 - 120 are also contemplated. In addition, if the minimum range values 1 and 2 are listed, and if the maximum range values 3, 4, and 5 are listed, then the following ranges are all contemplated: 1 - 3, 1 - 4, 1 - 5, 2 - 3, 2 - 4, and 2 - 5. In the present application, unless otherwise specified, the numerical range "a - b" represents an abbreviated representation of any real number combination between a and b, where a and b are both real numbers. For example, the numerical range "0 - 5" means that all real numbers between "0 - 5" have been fully listed herein, and "0 - 5" is only an abbreviated representation of these numerical combinations. Additionally, when stating that a certain parameter is an integer ≥2, it is equivalent to disclosing that the parameter is, for example, the integer 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, etc.

[0054] If there is no special instruction, all embodiments and optional embodiments of the present application can be combined with each other to form a new technical solution.

[0055] Unless otherwise specified, all technical features and optional technical features of this application can be combined with each other to form new technical solutions.

[0056] Unless otherwise specified, all steps of this application can be carried out in sequence or randomly, and preferably in sequence. For example, the method includes steps (a) and (b), which means that the method can include steps (a) and (b) carried out in sequence, or can also include steps (b) and (a) carried out in sequence. For example, it is mentioned that the method may further include step (c), which means that step (c) can be added to the method in any order. For example, the method can include steps (a), (b) and (c), or can also include steps (a), (c) and (b), or can also include steps (c), (a) and (b), etc.

[0057] Unless otherwise specified, the terms "comprising" and "including" mentioned in this application mean open-ended, and can also be closed-ended. For example, the "comprising" and "including" can mean that other components not listed can also be included or comprised, or can also mean only the components listed are included or comprised.

[0058] Unless otherwise specified, in this application, the term "or" is inclusive. For example, the phrase "A or B" means "A, B, or both A and B". More specifically, any of the following conditions satisfies the condition "A or B": A is true (or exists) and B is false (or does not exist); A is false (or does not exist) while B is true (or exists); or both A and B are true (or exist).

[0059] With the continuous development of secondary battery technology and new energy technology, they are increasingly being researched and applied in the energy storage field. Against this background, a new energy storage form, namely the battery cell storage device, has emerged. The battery cell storage device integrates components such as a body, a battery pack, a battery management system, an inverter, and electronic components, and can store electrical energy to solve the peak-valley difference of electricity consumption, reduce the electricity cost, and can also solve the problem of large fluctuations when new energy power generation is connected to the grid. It can also supply power independently under special circumstances such as a power outage in the main grid to ensure power supply safety. Clean energy technologies such as wind, light, and heat that require the application of energy storage technology are often concentrated in harsh environments such as high temperature and intense sunlight, which makes the battery cell storage device need to be exposed to high temperature weather for a long time, resulting in continuous temperature rise of the battery cells, electronic components, etc. inside the storage device. When the temperature rises to a certain level, thermal runaway will be triggered, leading to fire accidents. In the prior art, cooling methods such as forced air cooling, liquid cooling, and phase change cooling are often used to reduce the temperature of the battery cell storage device, which will undoubtedly increase the energy consumption of the system. How to meet the heat insulation requirements and insulation requirements of the battery cell storage device without increasing the system energy consumption is a technical problem that urgently needs to be solved in this field.

[0060] [Two-component coating]

[0061] Based on this, the present application provides a two-component coating, comprising a first component and a second component. The first component includes an aqueous hydroxyl-type acrylic resin and an inorganic filler, and the inorganic filler includes one or more of titanium dioxide and glass beads; the second component includes an aqueous isocyanate curing agent.

[0062] As used herein, the term "two-component coating" includes the combination of the first component and the second component, which are in a physically separated state (no physical contact) before use and are mixed only when in use.

[0063] As used herein, the term "aqueous resin" refers to a resin using an aqueous solvent as the dispersion medium.

[0064] As used herein, the term "hydroxyl" refers to a group with the chemical formula -OH, which belongs to a polar hydrophilic group.

[0065] As used herein, the term "acrylic resin" refers to a polymer prepared by polymerizing acrylic acid and its derivatives as monomers or a polymer prepared by copolymerizing acrylic acid and its derivatives as the main monomers with other monomers.

[0066] As used herein, the term "acrylic acid" refers to an organic compound with the chemical formula CH2=CHCOOH.

[0067] As used herein, the term "isocyanate curing agent" refers to the general name of various esters containing an isocyanate group (-NCO), including isocyanates and isocyanate prepolymers.

[0068] As used herein, the term "isocyanate" refers to an isocyanate monomer containing one or more isocyanate groups.

[0069] As used herein, the term "isocyanate prepolymer" refers to a macromolecular compound formed by the reaction of an isocyanate monomer containing at least 2 isocyanate groups with a polyol.

[0070] As used herein, the term "curing agent" refers to a substance or mixture that promotes or controls the curing reaction, and the curing of the resin is completed by adding a curing (crosslinking) agent.

[0071] The reaction formula for the reaction of the hydroxyl group in the hydroxyl-type acrylic resin with the isocyanate group of the isocyanate curing agent to form a urethane bond is as follows:

[0072]

[0073] As used herein, the term "inorganic filler" refers to granular fillers mainly made from natural minerals through mining and processing, and a small number of fillers are made through treatment.

[0074] In this text, the main component of the term "titanium dioxide" is titanium dioxide.

[0075] In this text, the main component of the term "glass microspheres" is borosilicate.

[0076] In some embodiments, the inorganic filler includes titanium dioxide and glass microspheres.

[0077] The two-component coating is composed of a first component containing a hydroxyl-type acrylic resin and a second component containing an isocyanate curing agent. The hydroxyl group in the hydroxyl-type acrylic resin reacts with the isocyanate group of the isocyanate curing agent to form a urethane bond. A class of polymer materials containing repeating urethane structural units is called polyurethane. Polyurethane has a low thermal conductivity, which can improve the heat insulation performance of the coating prepared from the two-component coating. Moreover, the polyurethane synthesized from the two-component coating has a high crosslinking density, and the coating has the advantages of high mechanical strength, strong adhesion, water and solvent resistance, and can extend the service life of the coating.

[0078] The first component of the two-component coating also contains an inorganic filler. Among them, titanium dioxide has excellent reflection ability to sunlight, and glass microspheres have low thermal conductivity and electrical insulation, which can make the coating have excellent heat reflection and electrical insulation performance, and can further improve the heat insulation performance of the coating. Spraying the two-component coating of the present application on the surface of the battery cell storage device body can obtain a coating with excellent heat reflection, heat insulation and electrical insulation performance, reducing the risks of thermal runaway and electric leakage of the battery cell storage device. Moreover, the two-component coating uses an aqueous solvent as the dispersion medium, has the advantages of low cost, convenient operation, non-flammable, environmental protection, non-toxic and safe, and is suitable for industrial applications in the field of battery cell storage device coatings.

[0079] In some embodiments, the aqueous hydroxyl-type acrylic resin includes one or more of an aqueous organosilicon-modified hydroxyl-type acrylic resin and an aqueous organofluorine-modified hydroxyl-type acrylic resin.

[0080] In this text, the term "organosilicon-modified hydroxyl-type acrylic resin" refers to grafting or block copolymerizing an organosilicon compound containing a Si-O bond or a Si-C bond onto the molecular chain of a hydroxyl-type acrylic resin.

[0081] In this text, the term "organofluorine-modified hydroxyl-type acrylic resin" refers to grafting or block copolymerizing an organofluorine material containing fluorine atoms onto the molecular chain of a hydroxyl-type acrylic resin.

[0082] Modifying acrylic resins with silicon - containing and fluorine - containing monomers or intermediates can improve the corrosion resistance, aging resistance, and stain resistance of the coating, achieving the protection of the battery cell storage device in various application scenarios such as outdoor environments and high - salt - fog environments, and enhancing the durability of the battery cell storage device. Moreover, silicone or organofluorine has good insulation properties, which can further improve the electrical insulation performance of the coating.

[0083] In some embodiments, the water - borne isocyanate curing agents include one or more of hexamethylene diisocyanate and its prepolymers, polymethylene polyphenyl polyisocyanate and its prepolymers, diphenylmethane diisocyanate prepolymer, carbodiimide - modified diphenylmethane diisocyanate prepolymer, isophorone diisocyanate prepolymer, toluene diisocyanate prepolymer, xylene diisocyanate prepolymer, phenylene diisocyanate and its prepolymers, dimethoxyaniline isocyanate and its prepolymers, alkylated benzene diisocyanate and its prepolymers.

[0084] In some embodiments, the water - borne isocyanate curing agent includes hexamethylene diisocyanate.

[0085] In some embodiments, the titanium dioxide includes rutile titanium dioxide.

[0086] Rutile titanium dioxide has a higher solar reflectance compared to other titanium dioxides, which is beneficial to further improving the thermal reflection performance of the coating and reducing the risk of thermal runaway of the battery cell storage device.

[0087] In some embodiments, based on the total mass of the first component, the mass ratio of titanium dioxide is 5% - 10%.

[0088] In some embodiments, based on the total mass of the first component, the mass ratio of titanium dioxide is 5%, 6%, 7%, 8%, 9%, 10% or any value therebetween.

[0089] Based on the total mass of the first component, when the mass ratio of titanium dioxide is within the above range, the two - component coating has a viscosity suitable for construction, and the coating has excellent thermal reflection performance, which can reduce the risk of thermal runaway of the battery cell storage device.

[0090] In some embodiments, the titanium dioxide includes a first titanium dioxide and a second titanium dioxide; wherein, the average particle size Dv50 of the first titanium dioxide is less than the average particle size Dv50 of the second titanium dioxide.

[0091] In this article, the term "average particle size Dv50" refers to the particle size corresponding to the cumulative volume distribution number of 50% in the particle size distribution curve.

[0092] The average particle size Dv50 of titanium dioxide can be measured by methods known in the art. As an example, referring to GB / T 19077-2016, it is measured using a laser particle size analyzer. The test instrument can be a Mastersizer 3000 laser particle size analyzer from Malvern Instruments Limited, UK.

[0093] The total energy of visible light and infrared light accounts for about 95% of the total energy of sunlight. Titanium dioxide with different particle size distributions is selected to make it have a reflective effect on visible light and infrared light respectively, so as to effectively improve the solar reflectance, hemispherical emissivity, and near-infrared light reflectance of the coating, making the coating have excellent heat reflection performance, which is beneficial to further reducing the risk of thermal runaway of the battery cell storage device.

[0094] In some embodiments, the average particle size Dv50 of the first titanium dioxide is 0.3 μm - 0.6 μm.

[0095] In some embodiments, the average particle size Dv50 of the first titanium dioxide is 0.3 μm, 0.4 μm, 0.5 μm, 0.6 μm or any value therebetween.

[0096] In some embodiments, the average particle size Dv50 of the second titanium dioxide is 0.6 μm - 1.0 μm.

[0097] In some embodiments, the average particle size Dv50 of the second titanium dioxide is 0.6 μm, 0.7 μm, 0.8 μm, 0.9 μm, 1.0 μm or any value therebetween.

[0098] In some embodiments, the glass microspheres include hollow glass microspheres, and the average particle size Dv50 of the hollow glass microspheres is 5 μm - 10 μm.

[0099] In some embodiments, the average particle size Dv50 of the hollow glass microspheres is 5 μm, 6 μm, 7 μm, 8 μm, 9 μm, 10 μm or any value therebetween.

[0100] The hollow glass microspheres have a lower thermal conductivity and excellent electrical insulation performance. The inclusion of hollow glass microspheres in the two-component coating can further improve the heat insulation performance and electrical insulation performance of the coating, thereby reducing the risks of thermal runaway and electric leakage of the battery cell storage device. The particle size of the hollow glass microspheres is within the above range, making the two-component coating have a viscosity suitable for construction, and the coating has excellent heat insulation performance and electrical insulation performance.

[0101] In some embodiments, the molar ratio of the hydroxyl group in the first component to the isocyanate group in the second component is 1:1.3 - 1:1.5.

[0102] In some embodiments, the molar ratio of the hydroxyl groups in the first component to the isocyanate groups in the second component is 1:1.3, 1:1.4, 1:1.5 or any value range between any two of them.

[0103] The molar ratio of the hydroxyl groups in the first component to the isocyanate groups in the second component within the above range enables the coating to have a certain degree of curing and strength, which is beneficial to improving the durability of the battery cell storage device.

[0104] In some embodiments, the inorganic filler further includes one or more of mica powder, calcium carbonate, kaolin, wollastonite, talc powder, and barium sulfate.

[0105] In this text, the term "mica powder" refers to being prepared by dry or wet grinding of natural mica ore, and its chemical composition is potassium silicate salt.

[0106] In this text, the term "kaolin", whose theoretical chemical formula is Al2[(OH)4 / Si2O5], is a kind of clay and clay rock mainly composed of kaolinite group clay minerals.

[0107] In this text, the term "wollastonite" refers to being prepared by ore dressing and pulverization of natural wollastonite, and its chemical composition is calcium metasilicate.

[0108] In this text, the term "talc powder" refers to being obtained by dry or wet pulverization or high-temperature calcination of natural talc, and its chemical composition is hydrated magnesium silicate.

[0109] The first component of the two-component coating contains inorganic filler, which can further enhance the thermal reflection, heat insulation and electrical insulation properties of the coating, and reduce the risks of thermal runaway and electric leakage of the battery cell storage device. Moreover, the addition of the inorganic filler can also reduce the cost of the two-component coating, which is suitable for the industrial application of the two-component coating in the field of battery cell storage device coatings.

[0110] In some embodiments, the first component further includes additives. Optionally, the additives include one or more of wetting agents, dispersants, leveling agents, film-forming aids, defoamers, pH regulators, and thickeners.

[0111] In some embodiments, the wetting agent includes one or more of alkynediols, hydrophobically modified acrylate salts, and polyether-modified polysiloxanes.

[0112] In this text, the term "polyether-modified polysiloxane" is generally formed by graft copolymerization of polyether and polysiloxane, and its molecular structure contains both hydrophilic polyether segments and hydrophobic polysiloxane segments, and it is a kind of organosilicon surfactant with unique properties.

[0113] In some embodiments, the dispersant includes one or more of polyphosphates, sodium polyacrylate salts, and ammonium polyacrylate salts.

[0114] In this text, the term "polyphosphate" refers to phosphates in which two or more PO 4 tetrahedrons are bonded to each other through shared oxygen atoms.

[0115] In some embodiments, the leveling agent includes one or more of polyether-modified silicone polymers, acrylate polymers, and fluorine-modified acrylate polymers.

[0116] In this text, the term "fluorine-modified acrylate polymer" refers to a polyacrylate polymer in which a fluorine atom-containing monomer is block or grafted onto the polyacrylate molecular chain, and a chemical bond is formed between the fluorine atom and the carbon atom.

[0117] In some embodiments, the film-forming aid includes one or more of alcohol ester 12, alcohol ester 14, and alcohol ester 16.

[0118] In some embodiments, the defoamer includes one or more of mineral oil defoamers and silicone defoamers.

[0119] In this text, the term "mineral oil defoamer" refers to a defoamer composed of mineral oil, inorganic hydrophobic particles, defoamer aids, emulsifiers, etc.

[0120] In this text, the term "silicone defoamer" refers to a defoamer prepared by a special process with polyorganosiloxanes having chain structures with different degrees of polymerization as the basic component, and equipped with appropriate solvents, emulsifiers, or inorganic fillers.

[0121] In some embodiments, the pH regulator includes one or more of 2-amino-2-methyl-1-propanol and ammonia water.

[0122] In some embodiments, the thickener includes one or more of associative polyacrylate alkali-swellable type, non-associative polyacrylate alkali-swellable type, and hydrophobically modified associative polyurethane.

[0123] In some embodiments, the alkali-swellable thickener is a substance that is insoluble in water in a neutral or acidic environment, but can dissolve and undergo a certain degree of chemical reaction in an alkaline solution to increase the molecular weight and thus achieve thickening.

[0124] In some embodiments, the associative thickener is a network structure formed by cross-association of various high-molecular organic compounds, thereby increasing the viscosity of the solution and achieving thickening.

[0125] In some embodiments, the second component further includes a diluent, and the diluent includes one or more of propylene glycol methyl ether acetate, ethyl acetate, and butyl acetate.

[0126] In some embodiments, based on the total mass of the first component, the first component includes an aqueous hydroxyl acrylic resin emulsion with a mass fraction of 20%-80%, an inorganic filler with a mass fraction of 5%-25%, an additive with a mass fraction of 1%-15%, and an aqueous solvent with a mass fraction of 1%-60%; based on the total mass of the second component, the second component includes an aqueous isocyanate curing agent with a mass fraction of 50%-90% and a diluent with a mass fraction of 10%-50%.

[0127] In some embodiments, the solid content of the aqueous hydroxyl acrylic resin emulsion is 50%-55%.

[0128] In some embodiments, the solid content of the aqueous hydroxyl acrylic resin emulsion is 50%, 51%, 52%, 53%, 54%, or 55%.

[0129] In some embodiments, based on the total mass of the first component, the mass fraction of the aqueous hydroxyl acrylic resin emulsion in the first component can be selected from 20%, 30%, 40%, 50%, 60%, 70%, 80%, or any value range between any two of them. In some embodiments, based on the total mass of the first component, the mass fraction of the inorganic filler in the first component can be selected from 5%, 10%, 15%, 20%, 25%, or any value range between any two of them. In some embodiments, based on the total mass of the first component, the mass fraction of the aqueous solvent in the first component can be selected from 1%, 10%, 20%, 30%, 40%, 50%, 60%, or any value range between any two of them. In some embodiments, based on the total mass of the second component, the mass fraction of the aqueous isocyanate curing agent in the second component is 50%, 60%, 70%, 80%, 90%, or any value range between any two of them. In some embodiments, based on the total mass of the second component, the mass fraction of the diluent in the second component is 10%, 20%, 30%, 40%, 50%, or any value range between any two of them.

[0130] When the solid content of the aqueous hydroxyl acrylic resin emulsion is within the above range, the two-component coating has an appropriate processing viscosity, and the prepared coating has excellent heat reflection, heat insulation, and electrical insulation properties.

[0131] In some embodiments, based on the total mass of the first component, the first component includes an aqueous hydroxyl acrylic resin emulsion with a mass fraction of 40%-60%, a first titanium dioxide with a mass fraction of 2.5%-5%, a second titanium dioxide with a mass fraction of 2.5%-5%, glass beads with a mass fraction of 1%-2%, other inorganic fillers with a mass fraction of 3%-6%, a wetting agent with a mass fraction of 0.1%-0.2%, a dispersant with a mass fraction of 0.2%-0.3%, a leveling agent with a mass fraction of 0.5%-1.0%, a film-forming aid with a mass fraction of 2.5%-3.5%, an antifoaming agent with a mass fraction of 0.1%-0.5%, a pH regulator with a mass fraction of 0.1%-0.5%, a thickener with a mass fraction of 0.3%-0.5%, and an aqueous solvent with a mass fraction of 15%-50%; based on the total mass of the second component, the second component includes an aqueous isocyanate curing agent with a mass fraction of 65%-75% and a diluent with a mass fraction of 25%-35%.

[0132] In some embodiments, based on the total mass of the first component, the first component includes an aqueous hydroxyl acrylic resin emulsion with a mass fraction of 50%, a first titanium dioxide with a mass fraction of 5%, a second titanium dioxide with a mass fraction of 5%, glass beads with a mass fraction of 2%, other inorganic fillers with a mass fraction of 6%, a wetting agent with a mass fraction of 0.2%, a dispersant with a mass fraction of 0.3%, a leveling agent with a mass fraction of 1.0%, a film-forming aid with a mass fraction of 3.5%, an antifoaming agent with a mass fraction of 0.45%, a pH regulator with a mass fraction of 0.45%, a thickener with a mass fraction of 0.5%, and an aqueous solvent with a mass fraction of 25.6%; based on the total mass of the second component, the second component includes an aqueous isocyanate curing agent with a mass fraction of 75% and a diluent with a mass fraction of 25%.

[0133] In some embodiments, based on the total mass of the first component, the first component includes an aqueous hydroxyl acrylic resin emulsion with a mass fraction of 45%, a first titanium dioxide with a mass fraction of 4%, a second titanium dioxide with a mass fraction of 4%, glass beads with a mass fraction of 1.5%, other inorganic fillers with a mass fraction of 4.5%, a wetting agent with a mass fraction of 0.15%, a dispersant with a mass fraction of 0.25%, a leveling agent with a mass fraction of 0.75%, a film-forming aid with a mass fraction of 3%, an antifoaming agent with a mass fraction of 0.35%, a pH regulator with a mass fraction of 0.35%, a thickener with a mass fraction of 0.4%, and an aqueous solvent with a mass fraction of 35.75%; based on the total mass of the second component, the second component includes an aqueous isocyanate curing agent with a mass fraction of 70% and a diluent with a mass fraction of 30%.

[0134] In some embodiments, based on the total mass of the first component, the first component includes an aqueous hydroxyl acrylic resin emulsion with a mass fraction of 40%, a first titanium dioxide with a mass fraction of 2.5%, a second titanium dioxide with a mass fraction of 2.5%, glass beads with a mass fraction of 1%, other inorganic fillers with a mass fraction of 3%, a wetting agent with a mass fraction of 0.1%, a dispersant with a mass fraction of 0.2%, a leveling agent with a mass fraction of 0.5%, a film-forming auxiliary with a mass fraction of 2.5%, an antifoaming agent with a mass fraction of 0.2%, a pH regulator with a mass fraction of 0.2%, a thickener with a mass fraction of 0.3%, and an aqueous solvent with a mass fraction of 47%; based on the total mass of the second component, the second component includes an aqueous isocyanate curing agent with a mass fraction of 70% and a diluent with a mass fraction of 30%.

[0135] When the mass fractions of the components of the first component and the second component of the two-component coating are within the above ranges, the coating prepared from the two-component coating has excellent heat reflection, heat insulation, and electrical insulation properties, and can reduce the risks of thermal runaway and electric leakage of the battery cell storage device. Moreover, the waterborne two-component coating uses an aqueous solvent as the dispersion medium, and has the advantages of environmental protection, low cost, and convenient operation, and is suitable for industrial applications in the field of battery cell storage device coatings.

[0136] [Coating]

[0137] The second aspect of the present application provides a coating prepared from the two-component coating of the first aspect.

[0138] In some embodiments, the thickness of the coating is 100 μm - 150 μm.

[0139] The thickness of the coating can be tested by methods known in the art. As an example, the thickness of the coating is tested with a MiniTest600 thickness gauge produced by EPK Company of Germany, with a measurement range of 0 - 300 μm and an error of ±2 μm.

[0140] In some embodiments, the thickness of the coating is 100 μm, 110 μm, 120 μm, 130 μm, 140 μm, 150 μm, or any value between any two of them.

[0141] When the thickness of the coating is within the above range, when constructing the battery cell storage device body, the coating is not likely to sag, and while having excellent heat reflection, heat insulation, and electrical insulation properties, the construction cost can be reduced.

[0142] In some embodiments, the solar reflectance of the coating is greater than or equal to 0.8.

[0143] In this article, the term "solar reflectance" refers to the ratio of the reflected solar radiant energy flux to the incident solar radiant energy flux.

[0144] The solar reflectance of the coating can be tested by methods known in the art. As an example, a two-component coating is applied to an aluminum substrate to form a coating with a thickness of 100 μm to 150 μm on the aluminum substrate; according to ASTM C 1549 standard, a solar reflectance tester (Labcan Scientific, PM-A2) is used to measure the solar reflectance of the coating.

[0145] In some embodiments, the solar reflectance of the coating is 0.81, 0.82, 0.83, 0.84, 0.85, 0.86, 0.87, 0.88, 0.89, 0.90, 0.91, 0.92, 0.93, 0.94, 0.95, 0.96, 0.97, 0.98, 0.99 or any value between any two of them.

[0146] In some embodiments, the hemispherical emissivity of the coating is greater than or equal to 0.8.

[0147] As used herein, the term "hemispherical emissivity" refers to the ratio of the ability of an object's surface to radiate in all directions to that of an ideal black body.

[0148] The hemispherical emissivity of the coating can be tested by methods known in the art. As an example, a two-component coating is applied to an aluminum substrate to form a coating with a thickness of 100 μm to 150 μm on the aluminum substrate; according to ASTM C1371 standard, a solar radiation reflectance tester (Scientific, PM-E2) is used to measure the hemispherical emissivity of the coating.

[0149] In some embodiments, the hemispherical emissivity of the coating is 0.8, 0.81, 0.82, 0.83, 0.84, 0.85, 0.86, 0.87, 0.88, 0.89, 0.90, 0.91, 0.92, 0.93, 0.94, 0.95, 0.96, 0.97, 0.98, 0.99 or any value between any two of them.

[0150] In some embodiments, the near-infrared reflectance of the coating is greater than or equal to 0.8.

[0151] As used herein, the term "near-infrared reflectance" refers to the ratio of the solar radiation energy flux reflected in the near-infrared band to the incident solar radiation energy flux.

[0152] The near-infrared light reflectance of the coating can be tested by methods known in the art. As an example, a two-component coating is applied to an aluminum substrate to form a coating with a thickness of 100 μm to 150 μm on the aluminum substrate; according to the ASTM C 1549 standard, a solar reflectance tester (Labcan Scientific, PM-A2) is used to measure the near-infrared light reflectance of the coating.

[0153] In some embodiments, the near-infrared light reflectance of the coating is 0.8, 0.81, 0.82, 0.83, 0.84, 0.85, 0.86, 0.87, 0.88, 0.89, 0.90, 0.91, 0.92, 0.93, 0.94, 0.95, 0.96, 0.97, 0.98, 0.99 or any value between any two of them.

[0154] In some embodiments, the dielectric strength of the coating is greater than or equal to 45 kV / mm.

[0155] As used herein, the term "dielectric strength" refers to a measure of the electrical strength of a material as an insulator, which is defined as the maximum voltage per unit thickness that a specimen can withstand when it is broken down.

[0156] The dielectric strength of the coating can be tested by methods known in the art. As an example, the test steps are as follows: (1) Apply a two-component coating to an aluminum substrate to form a coating with a thickness of 100 μm to 150 μm on the aluminum substrate; (2) Place the coated aluminum substrate on the electrical insulating box of the dielectric strength tester on the brass flat-top cylinder electrical contact, with the coated side of the sample facing the contact; (3) Lower the brass tip and press it against the back side of the sample (the side opposite to the coated side), and then seal the box; (4) Run the dielectric strength tester 3 times and take the average value to obtain the dielectric strength.

[0157] In some embodiments, the dielectric strength of the coating is 45 kV / mm, 46 kV / mm, 47 kV / mm, 48 kV / mm, 49 kV / mm, 50 kV / mm, 51 kV / mm, 52 kV / mm, 53 kV / mm, 54 kV / mm, 55 kV / mm, 56 kV / mm or any value between any two of them.

[0158] In some embodiments, the thermal conductivity of the coating is less than or equal to 0.1 W / (m·K).

[0159] The thermal conductivity of the coating can be tested by methods known in the art. As an example, a two-component coating is applied to an aluminum substrate to form a coating with a thickness of 100 μm to 150 μm on the aluminum substrate. The thermal conductivity of the coating is detected using a thermal conductivity tester with reference to ASTM D5470-2017 Standard Test Method for Thermal Transmission Properties of Thermal Insulation Materials.

[0160] In some embodiments, the thermal conductivity of the coating is 0.01 W / (m·K), 0.02 W / (m·K), 0.03 W / (m·K), 0.04 W / (m·K), 0.05 W / (m·K), 0.06 W / (m·K), 0.07 W / (m·K), 0.08 W / (m·K), 0.09 W / (m·K), 0.1 W / (m·K), or any value between any two of them.

[0161] In some embodiments, the volume resistivity of the coating is greater than or equal to 1×10 15 Ω·cm.

[0162] The volume resistivity of the coating can be tested by methods known in the art. As an example, a two-component coating is applied to an aluminum substrate to form a coating with a thickness of 100 μm to 150 μm on the aluminum substrate, and it is tested with reference to Standard GB / T 31838.2-2019 Solid insulating materials - Dielectric and resistive properties - Part 2: Resistive properties (DC method) - Volume resistance and volume resistivity.

[0163] In some embodiments, the volume resistivity of the coating is 1×10 15 Ω·cm, 2×10 15 Ω·cm, 3×10 15 Ω·cm, 4×10 15 Ω·cm, 5×10 15 Ω·cm, 6×10 15 Ω·cm, 7×10 15 Ω·cm, 8×10 15 Ω·cm, 9×10 15 Ω·cm, 10×10 15 Ω·cm, 11×10 15 Ω·cm, 12×10 15 Ω·cm, 13×10 15 Ω·cm, 14×10 15 Ω·cm, 15×10 15 Ω·cm, or any value between any two of them.

[0164] In some embodiments, the solar reflectance ratio of the coating is 0.9 - 0.99.

[0165] In some embodiments, the hemispherical emissivity of the coating is 0.9 - 0.99.

[0166] In some embodiments, the near-infrared light reflectance ratio of the coating is 0.9 - 0.99.

[0167] In some embodiments, the volume resistivity of the coating is greater than or equal to 1×10 16 Ω·cm.

[0168] [Cell storage device]

[0169] The third aspect of the present application provides a cell storage device, including a body and a coating disposed at least partially on the surface of the body, and the coating is as described in the second aspect.

[0170] The cell storage device integrates components such as a body, a battery pack, a battery management system, an inverter, and electronic components, and has the advantages of being economical, efficient, flexible, convenient, and optimizing the energy structure. It is suitable for new energy fields such as photovoltaic, wind power, and nuclear power, and has a wide range of application scenarios. The cell storage device has a coating prepared according to the present application disposed at least partially on the surface of the body, and the coating has excellent electrical insulation, heat reflection, and heat insulation properties, which can reduce the risks of electric leakage and thermal runaway of the cell storage device.

[0171] In some embodiments, the body includes any one of stainless steel, aluminum, and aluminum alloy.

[0172] Examples

[0173] Hereinafter, the examples of the present application will be described. The examples described below are exemplary and are only used to explain the present application, and should not be construed as a limitation of the present application. For those not specified in the examples in terms of specific techniques or conditions, the techniques or conditions described in the literature in the art or the product specifications are followed. For reagents or instruments not specified in the manufacturer, they are all conventional products that can be obtained through commercial purchase.

[0174] I. Preparation method

[0175] Example 1:

[0176] 1) Preparation of two-component coating

[0177] Preparation of the first component: The total mass of the first component is 100 parts. Pour 25.6 parts by mass of deionized water into a disperser, and successively add 0.2 parts by mass of polyether-modified polysiloxane (wetting agent), 0.3 parts by mass of ammonium polyacrylate (dispersant), and 0.225 parts by mass of polyether-modified polydimethylsiloxane (defoaming agent) at a stirring speed of 350 r / min, and stir for 2 minutes; then successively add 5 parts of the first titanium dioxide, 5 parts of the second titanium dioxide, 2 parts of hollow glass microspheres, 2 parts of mica powder, 2 parts of calcium carbonate, and 2 parts of kaolin at a stirring speed of 1000 r / min and stir for 10 minutes; among them, both the first titanium dioxide and the second titanium dioxide are rutile-type titanium dioxide; then add 3.5 parts by mass of 2-ethylhexyl acetate (film-forming aid), 0.45 parts by mass of AMP-95 (pH regulator), 1 part of polyether-modified polysiloxane (flow agent), 0.5 part of associative alkali-swellable polyacrylate (thickener), 50 parts of waterborne organosilicon-modified hydroxyl acrylic emulsion, and 0.225 parts by mass of polyether-modified polydimethylsiloxane (defoaming agent) at a stirring speed of 500 r / min, and obtain the first component after stirring for 10 minutes.

[0178] Among them, the Dv50 of the first titanium dioxide is 0.3 μm - 0.6 μm, the Dv50 of the second titanium dioxide is 0.6 μm - 1.0 μm, the solid content of the waterborne hydroxyl acrylic resin emulsion is 50% - 55%, the hydroxyl value is 3.5% - 4.0%, and the Dv50 of the hollow glass microsphere filler is 5 μm - 10 μm.

[0179] Preparation of the second component: The total mass of the second component is 100 parts. Pour 75 parts by mass of waterborne hexamethylene diisocyanate trimer into a disperser; add 25 parts by mass of propylene glycol methyl ether acetate (diluent) at a stirring speed of 350 r / min and stir for 10 minutes to obtain the second component.

[0180] Mix the prepared first component and the prepared second component according to a molar ratio of hydroxyl group to isocyanate group of 1:1.5, stir evenly at a speed of 350 r / min, and add an appropriate amount of defoaming agent as appropriate according to the actual situation to obtain a coating, and the viscosity of the coating is 500 - 1000 mPa·s.

[0181] 2) Preparation of the coating

[0182] Spray the surface of the main body of the cell storage device with the coating and dry it to obtain a coating. Among them, the material of the main body of the cell storage device is sheet metal steel, and the thickness of the coating is 100 μm - 150 μm.

[0183] Examples 2 - 3

[0184] Example 2-3 adjusted the components in the two-component coating, and the others were basically the same as those in Example 1, as shown in Table 1 specifically.

[0185] Example 4

[0186] Example 4 adjusted the type of the waterborne hydroxyl acrylic resin to a waterborne hydroxyl acrylic resin, and the others were basically the same as those in Example 1, as shown in Table 1 specifically.

[0187] Examples 5-6

[0188] In the two-component coatings of Examples 5-6, there was only the first titanium dioxide or the second titanium dioxide, and the others were basically the same as those in Example 1, as shown in Table 1 specifically.

[0189] Comparative Example 1

[0190] Comparative Example 1 adjusted the components in the two-component coating, and the others were basically the same as those in Example 1, as shown in Table 1 specifically.

[0191] Comparative Example 2

[0192] Comparative Example 2 adjusted the components in the two-component coating, and the others were basically the same as those in Example 2, as shown in Table 1 specifically.

[0193] Comparative Example 3

[0194] Comparative Example 3 adjusted the components in the two-component coating, and the others were basically the same as those in Example 3, as shown in Table 1 specifically.

[0195]

[0196] II. Test Methods

[0197] 1. Comparative Tracking Index (CTI)

[0198] Apply the two-component coating to the aluminum substrate to form a coating with a thickness of 100 μm on the aluminum substrate; conduct the tracking resistance performance test on the coating using an NDHM type tracking resistance index tester in accordance with GB4207-84, and record the tracking resistance index of the specimen.

[0199] 2. Salt Spray Resistance Test

[0200] Apply the two-component coating to the aluminum substrate to form a coating with a thickness of 100 μm on the aluminum substrate; among them, the aluminum substrate is treated by sandblasting or shot peening, and its rust removal grade reaches Sa2 specified in GB / T8923 1Level 2, the surface roughness reaches the intermediate level specified in GB / T 13288.1. According to the provisions of GB / T 1771-2007, a scribed line parallel to the long side of the test panel is drawn in the middle of the test panel for the test, and the treatment time is 720 hours. If the unidirectional corrosion expansion at the scribed line is ≤ 2.0 mm and there are no phenomena such as blistering, rusting, cracking, and peeling in the coating at the non-scribed line area, it is judged as Y; if any one of them does not meet the requirements, it is judged as N.

[0201] 3. Aging resistance test

[0202] Apply the two-component coating to the stainless steel plate to form a coating with a thickness of 100 μm on the stainless steel plate; conduct the test according to the provisions of Cycle A in Method 1 of GB / T1865-2009, and the treatment time is 800 hours. The result evaluation is carried out according to the provisions of GB / T 1766-2008. If there are no phenomena such as blistering, peeling, cracking, rusting, and powdering in the coating, it is judged as Y; if any one of them does not meet the requirements, it is judged as N.

[0203] III. Analysis of test results of each example and comparative example

[0204] Prepare the two-component coatings of each example and comparative example respectively according to the above method, and measure the various performance parameters of the coating. The results are shown in Tables 2 and 3 below.

[0205] Table 2

[0206]

[0207]

[0208] Table 3

[0209]

[0210] According to the above results, it can be seen that the two-component coatings in Examples 1-6 all include a first component and a second component. The first component includes a waterborne hydroxyl acrylic resin and inorganic fillers, and the inorganic fillers include one or more of titanium dioxide and glass microspheres; the second component includes a waterborne isocyanate curing agent. The coating has excellent volume resistivity, dielectric strength, tracking resistance index, solar reflectance, hemispherical emissivity, near-infrared reflectance, and low thermal conductivity.

[0211] It can be seen from the comparison between the examples and the comparative examples that when the first component of the two-component coating includes titanium dioxide and hollow glass microspheres, the volume resistivity, dielectric strength, tracking resistance index, solar reflectance, hemispherical emissivity, and near-infrared reflectance of the coating can be improved, and the thermal conductivity of the coating can be reduced.

[0212] It can be seen from the comparison between Example 1 and Example 4 that when the waterborne hydroxyl acrylic resin in the first component is a waterborne silicone-modified hydroxyl acrylic resin, the salt spray resistance and aging resistance of the coating can be improved, and the volume resistivity and dielectric strength of the coating can be further improved.

[0213] It can be seen from the comparison between Example 1, Example 5 and Example 6 that when the first component of the two-component coating includes the first titanium dioxide with a particle size of 0.3 μm - 0.6 μm and the second titanium dioxide with a particle size of 0.6 μm - 1.0 μm, the solar reflectance, hemispherical emissivity and near-infrared reflectance of the coating can be improved.

[0214] It should be noted that this application is not limited to the above embodiments. The above embodiments are only examples, and the embodiments with the same structure and the same effect as the technical idea within the technical solution scope of this application are all included in the technical scope of this application. In addition, within the scope not departing from the gist of this application, various modifications that those skilled in the art can think of to the embodiments, and other ways constructed by combining some constituent elements in the embodiments are also included in the scope of this application.

Claims

1. A two-component coating, characterized in that, It includes a first component and a second component. The first component includes an aqueous hydroxy acrylic resin and an inorganic filler, and the inorganic filler includes one or more of titanium dioxide and glass microspheres; The second component includes an aqueous isocyanate curing agent.

2. The two-component coating according to claim 1, characterized in that, The titanium dioxide includes rutile titanium dioxide.

3. The two-component coating according to claim 1 or 2, wherein Based on the total mass of the first component, the mass ratio of the titanium dioxide is 5%-10%.

4. The two-component coating according to any one of claims 1 to 3, wherein The titanium dioxide includes a first titanium dioxide and a second titanium dioxide; wherein, the average particle size Dv50 of the first titanium dioxide is smaller than the average particle size Dv50 of the second titanium dioxide.

5. The two-component coating according to claim 4, wherein The average particle size Dv50 of the first titanium dioxide is 0.3μm - 0.6μm, and / or The average particle size Dv50 of the second titanium dioxide is 0.6μm - 1.0μm.

6. The two-component coating according to any one of claims 1 to 5, characterized in that, The glass microspheres include hollow glass microspheres, and the average particle size Dv50 of the hollow glass microspheres is 5μm - 10μm.

7. The two-component coating according to any one of claims 1 to 6, characterized in that, The molar ratio of the hydroxyl group in the first component to the isocyanate group in the second component is 1:1.3 - 1:1.

5.

8. The two-component coating according to any one of claims 1 to 7, characterized in that, The inorganic filler further includes one or more of mica powder, calcium carbonate, kaolin, wollastonite, talc powder, and barium sulfate.

9. The two-component coating according to any one of claims 1 to 8, characterized in that, The first component further includes additives. Optionally, the additives include one or more of a wetting agent, a dispersant, a leveling agent, a film-forming aid, an antifoaming agent, a pH regulator, and a thickener.

10. The two-component coating according to claim 9, characterized in that, The wetting agent includes one or more of alkynediol, hydrophobically modified acrylate, and polyether-modified polysiloxane.

11. The two-component coating according to claim 9 or 10, characterized in that, The dispersant includes one or more of polyphosphate, sodium polyacrylate, and ammonium polyacrylate.

12. The two-component coating according to any one of claims 9 to 11, characterized in that, The leveling agent includes one or more of polyether-modified silicone polymers, acrylate polymers, and fluorine-modified acrylate polymers.

13. The two-component coating according to any one of claims 9 to 12, characterized in that, The film-forming aid includes one or more of alcohol ester 12, alcohol ester 14, and alcohol ester 16.

14. The two-component coating according to any one of claims 9 to 13, characterized in that, The antifoaming agent includes one or more of mineral oil antifoaming agents and silicone antifoaming agents.

15. The two-component coating according to any one of claims 9 to 14, characterized in that, The pH regulator includes one or more of 2-amino-2-methyl-1-propanol and ammonia water.

16. The two-component coating according to any one of claims 9 to 15, characterized in that, The thickener includes one or more of associative polyacrylate alkali-swellable type, non-associative polyacrylate alkali-swellable type, and hydrophobically modified associative polyurethane.

17. The two-component coating according to any one of claims 1 to 16, characterized in that, The aqueous hydroxy acrylic resin includes one or more of aqueous organosilicon-modified hydroxy acrylic resin and aqueous organofluorine-modified hydroxy acrylic resin.

18. The two-component coating according to any one of claims 1 to 17, characterized in that, The aqueous isocyanate curing agent includes one or more of hexamethylene diisocyanate and its prepolymer, polymethylene polyphenyl polyisocyanate and its prepolymer, diphenylmethane diisocyanate prepolymer, carbodiimide-modified diphenylmethane diisocyanate prepolymer, isophorone diisocyanate prepolymer, toluene diisocyanate prepolymer, xylene diisocyanate prepolymer, phenylene diisocyanate and its prepolymer, dimethoxyaniline isocyanate and its prepolymer, and alkylated benzene diisocyanate and its prepolymer.

19. The two-component coating according to any one of claims 1 to 18, characterized in that the second component further includes a diluent, and the diluent includes one or more of propylene glycol methyl ether acetate, ethyl acetate, and butyl acetate.

20. The two-component coating according to claim 19, characterized in that based on the total mass of the first component, the first component includes an aqueous hydroxyl acrylic resin emulsion with a mass fraction of 20%-80%, an inorganic filler with a mass fraction of 5%-25%, an additive with a mass fraction of 1%-15%, and an aqueous solvent with a mass fraction of 1%-60%; based on the total mass of the second component, the second component includes an aqueous isocyanate curing agent with a mass fraction of 50%-90% and a diluent with a mass fraction of 10%-50%.

21. The two-component coating according to claim 19 or 20, characterized in that based on the total mass of the first component, the first component includes an aqueous hydroxyl acrylic resin emulsion with a mass fraction of 40%-60%, a first titanium dioxide with a mass fraction of 2.5%-5%, a second titanium dioxide with a mass fraction of 2.5%-5%, glass microspheres with a mass fraction of 1%-2%, other inorganic fillers with a mass fraction of 3%-6%, a wetting agent with a mass fraction of 0.1%-0.2%, a dispersant with a mass fraction of 0.2%-0.3%, a leveling agent with a mass fraction of 0.5%-1.0%, a film-forming auxiliary agent with a mass fraction of 2.5%-3.5%, an antifoaming agent with a mass fraction of 0.1%-0.5%, a pH regulator with a mass fraction of 0.1%-0.5%, a thickening agent with a mass fraction of 0.3%-0.5%, and an aqueous solvent with a mass fraction of 15%-50%; based on the total mass of the second component, the second component includes an aqueous isocyanate curing agent with a mass fraction of 65%-75% and a diluent with a mass fraction of 25%-35%.

22. A coating, characterized in that, The coating is prepared from the two-component coating according to any one of claims 1 to 21.

23. The coating according to claim 22, wherein, The thickness of the coating is 100 μm - 150 μm.

24. The coating according to claim 22 or 23, characterized in that, The coating satisfies one or more of the following conditions: (1) The solar reflectance of the coating is greater than or equal to 0.8; (2) The hemispherical emissivity of the coating is greater than or equal to 0.8; (3) The near-infrared reflectance of the coating is greater than or equal to 0.8; (4) The dielectric strength of the coating is greater than or equal to 45 kV / mm; (5) The thermal conductivity of the coating is less than or equal to 0.1 W / (m·K); (6) The volume resistivity of the coating is greater than or equal to 1×10 15 Ω·cm.

25. The coating according to any one of claims 22 to 24, characterized in that, The coating satisfies one or more of the following conditions: (1) The solar reflectance of the coating is 0.9 - 0.99; (2) The hemispherical emissivity of the coating is 0.9 - 0.99; (3) The near-infrared reflectance of the coating is 0.9 - 0.99; (4) The volume resistivity of the coating is greater than or equal to 1×10 16 Ω·cm.

26. A battery cell storage device, characterized in that, The device includes a body and a coating disposed at least partially on the surface of the body, and the coating is as described in any one of claims 22 to 25.

27. The apparatus according to claim 26, wherein The body includes one or more of stainless steel, aluminum, and aluminum alloy.

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