A water-based paint for energy storage devices and a method for preparing the same

Abstract

The present application relates to a kind of water-based paint for energy storage equipment and its preparation method, belong to paint technical field, the present application is prepared fluorocarbon modified polyurethane dispersion by special method, zirconium phosphate-polyaniline core-shell flame retardant, then with ZnNiAl-LDH two-dimensional layered three-metal hydroxide, C18-36 acid glycol ester, water-based silicone modified acrylic resin, water-based epoxy ester resin, nano-silica, nano cerium oxide and other ingredients are used, so that the paint has good weather resistance and flame retardance, outstanding corrosion resistance, higher hardness and wear resistance, also has good adhesion, ensure that coating and equipment surface firmly combine, comprehensively protect energy storage equipment, improve its reliability, safety and service life.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of coatings, and particularly relates to a water-based coating for energy storage equipment and a preparation method thereof. BACKGROUND

[0002] In the process of actively promoting energy transformation and sustainable development, energy storage technology has become a key support in the energy field. As a carrier for storing and releasing electric energy, the importance of energy storage equipment is increasingly prominent and plays an irreplaceable role in many key fields. Common energy storage equipment includes battery energy storage systems such as lead-acid batteries, lithium-ion batteries, sodium-sulfur batteries, and physical energy storage methods such as pumped storage, compressed air storage, and flywheel energy storage.

[0003] In a complex operating environment, energy storage equipment faces various types of erosion; outdoor energy storage equipment is subjected to UV radiation all year round, which can cause the shell to age; and in humid environments, metal components are prone to corrosion, reducing equipment performance and lifespan. Therefore, energy storage equipment often needs to be painted for protection. The paint forms a barrier to block UV rays, moisture, chemicals, and other substances, protecting the equipment substrate. On the other hand, paint can improve equipment safety, and some special coatings have flame-retardant and anti-static properties, which can reduce the risk of fire and static electricity hazards and ensure the safe and stable operation of energy storage equipment.

[0004] Currently, the coatings used for energy storage equipment mainly include solvent-based coatings and water-based coatings. Solvent-based coatings have good film-forming properties and excellent mechanical properties, but they contain a large amount of volatile organic compounds (VOCs), which can pollute the environment and harm human health during production, application, and use. Water-based coatings use water as a diluent and have the advantages of environmental protection, low toxicity, and safety, which are in line with current environmental protection concepts and have developed rapidly in recent years.

[0005] Energy storage equipment coatings need to have multiple properties. In terms of protective performance, they need to have good weather resistance to resist UV rays, high and low temperature cycles, and prevent the coating from chalking and fading; excellent corrosion resistance to resist chemical substance erosion such as acid, alkali, and salt; and excellent water resistance to prevent moisture penetration. In terms of mechanical properties, high hardness and wear resistance are essential to withstand daily friction and impact; good flexibility to prevent the coating from cracking and falling off when the equipment vibrates or deforms. In addition, they need to have good adhesion to ensure that the coating is firmly combined with the equipment surface; and in some scenarios, the coating should also have special functions such as fire resistance and anti-static properties.

[0006] Although there are various coatings in the market, there are still many problems in the coatings for energy storage equipment, mainly as follows: (1) solvent-based coatings have good performance, but poor environmental protection, and their use is limited with the tightening of environmental protection regulations. (2) Water-based coatings are environmentally friendly, but the hardness and wear resistance of the coating film are insufficient, and they are easily scratched and worn in use; the salt spray corrosion resistance, weather resistance, and flame retardance are not as good as those of solvent-based coatings, and the protective effect is not good in high humidity and strong corrosion environment.

[0007] Therefore, it is necessary to continuously develop energy storage equipment coatings with high performance, environmental protection, and excellent comprehensive performance to promote the development of the energy storage equipment industry and improve the reliability, safety, and service life of the equipment. SUMMARY

[0008] In view of the poor environmental protection of existing solvent-based coatings and the unsatisfactory performance indicators of water-based coatings, the present application provides a water-based coating for energy storage equipment and a preparation method thereof. The fluorocarbon modified polyurethane dispersion, zirconium phosphate-polyaniline core-shell flame retardant are prepared by a special method, and then used in combination with ZnNiAl-LDH two-dimensional layered triple metal hydroxide, C18-36 acid glycol ester, water-based silicone modified acrylic resin, water-based epoxy ester resin, nano silicon dioxide, nano cerium oxide and other components, so that the coating has good weather resistance and flame retardance, excellent corrosion resistance, high hardness and wear resistance, and also has good adhesion, ensuring that the coating and the equipment surface are firmly combined, fully protecting the energy storage equipment and improving its reliability, safety and service life. The specific technical scheme is as follows:

[0009] A water-based coating for energy storage equipment, comprising the following mass fractions of raw materials: 10-15 parts of fluorocarbon modified polyurethane dispersion, 15-20 parts of water-based epoxy ester resin, 30-35 parts of water-based silicone modified acrylic resin, 0.5-1 part of ZnNiAl-LDH two-dimensional layered triple metal hydroxide, 6-8 parts of zirconium phosphate-polyaniline core-shell flame retardant, 8-10 parts of nano silicon dioxide, 4-6 parts of water-based polycarbodiimide, 1-2 parts of nano cerium oxide, 0.5-0.8 parts of polyether modified silicone defoamer, 3-5 parts of C18-36 acid glycol ester, 0.3-0.8 parts of leveling agent, 3-6 parts of pigment, 5-8 parts of 1-ethoxy-2-propanol, and the balance is water, with a solid content of 45-50 wt%.

[0010] The preparation method of the fluorocarbon modified polyurethane dispersion includes the following steps: under nitrogen protection, isophorone diisocyanate 40-50 parts by mass, hexafluorobutylene glycol 20-25 parts by mass, polypropylene ether glycol 30-35 parts by mass and C20-22 alcohol phosphate 3-5 parts by mass are stirred and mixed uniformly at 75-85℃ to obtain a mixed solution A, dibutyltin dilaurate is added, and stirring reaction is carried out to obtain a reaction solution B; the temperature is lowered to 55-65℃, dimethylol propionic acid 5-8 parts and acetone 100-120 parts are added, and stirring reaction is continuously carried out, after the reaction is completed, triethylamine is added to neutralize the pH value to 7-8, then deionized water 120-150 parts is added under high-speed shearing to form a stable dispersion with a particle size of less than 200 nm, and acetone and part of the deionized water are removed by distillation under reduced pressure to obtain a fluorocarbon modified polyurethane dispersion with a solid content of 40-50 wt%.

[0011] In the preparation method of the fluorocarbon modified polyurethane dispersion, the amount of dibutyltin dilaurate added is 0.05-0.08% of the mass of the mixed solution A.

[0012] In the preparation method of the fluorocarbon modified polyurethane dispersion, the stirring reaction speed is 300-500 r / min, the stirring reaction time is 3-4 h, and the high-speed shearing speed is 3000-5000 rpm.

[0013] In the water-based paint, the preparation method of the zirconium phosphate-polyaniline core-shell flame retardant includes the following steps: zirconium phosphate is added into ethanol and uniformly dispersed by ultrasonic, 6-8 wt% of γ-aminopropyl triethoxysilane based on the mass of the zirconium phosphate is added, stirring reaction is carried out for 2-3 h, centrifugation is carried out, the precipitate is washed with anhydrous ethanol, and drying is carried out to obtain treated zirconium phosphate; the treated zirconium phosphate is added into a hydrochloric acid solution and ultrasonically dispersed, aniline is added at a mass ratio of aniline:treated zirconium phosphate = (2-3):1 at 2-6℃, mixing is uniformly carried out, then ammonium persulfate aqueous solution is added, stirring polymerization reaction is carried out for 6-8 h, centrifugation is carried out, the precipitate is washed with deionized water and ethanol alternately, and drying is carried out to obtain a zirconium phosphate-polyaniline core-shell flame retardant.

[0014] In the preparation method of the zirconium phosphate-polyaniline core-shell flame retardant, the particle size of the zirconium phosphate is nanoscale, the amount of the ethanol is 10-12 times of the mass of the zirconium phosphate, the amount of the hydrochloric acid solution is 10-12 times of the mass of the treated zirconium phosphate, the hydrochloric acid solution is a 1-1.5 mol / L hydrochloric acid aqueous solution, the hydrochloric acid solution contains camphor sulfonic acid at 5-8 g / 100 mL, and the concentration of the ammonium sulfate aqueous solution is 50-60 g / 100 mL.

[0015] The frequency of the ultrasonic dispersion is 40 kHz-60 kHz, the power is 150 W-250 W, and the time is 30 min-60 min in the preparation method of the zirconium phosphate-polyaniline core-shell flame retardant.

[0016] The anhydrous ethanol is washed for 2-3 times in the preparation method of the zirconium phosphate-polyaniline core-shell flame retardant, and the deionized water and ethanol are alternately washed for 2-3 times each time.

[0017] The preparation method of the water-based paint for the energy storage device comprises the following steps:

[0018] S1: The ZnNiAl-LDH two-dimensional layered three-metal hydroxide, the zirconium phosphate-polyaniline core-shell flame retardant, the nano-silicon dioxide and the nano-cerium oxide are uniformly airflow-mixed according to mass fractions to obtain a mixed powder;

[0019] S2: The water-based epoxy ester resin, the water-based silicone-modified acrylic resin and 1-ethoxy-2-propanol are stirred and mixed according to mass fractions, and then the mixed powder and pigments are added and stirred and mixed.

[0020] S3: The mixed material is transferred to a high-speed dispersion machine, high-speed dispersion is performed, and then grinding is performed, water is added to adjust the solid content of the system to 45wt%-50wt%, and stirring and mixing are uniformly performed to obtain the water-based paint.

[0021] In the preparation method of the water-based paint, the stirring and mixing speed is 300 r / min-500 r / min, and the stirring and mixing time is 15 min-20 min; the high-speed dispersion is performed at 3000 rpm-5000 rpm for 30 min-60 min; the grinding parameters are as follows: the grinding medium is zirconium oxide with a particle size of 0.1 mm-0.3 mm, the grinding speed is 1500 rpm-2500 rpm, and the feeding speed is 2 L / min-3 L / min.

[0022] The water-based paint for the energy storage device and the preparation method thereof have the following beneficial effects:

[0023] In the preparation method of the fluorocarbon-modified polyurethane dispersion, isophorone diisocyanate, as a multi-functional isocyanate, has high reactivity and can undergo step-by-step polymerization with hexafluorobutanediol and polypropylene ether glycol. Under the action of dibutyltin dilaurate, a high-efficiency catalyst, the reaction rate is significantly improved, and a prepolymer containing isocyanate groups is generated. The introduction of dimethylol propionic acid is crucial, as it successfully introduces carboxyl groups into the prepolymer through chemical reactions. The carboxyl groups undergo neutralization reactions with triethylamine, enabling the entire system to form a stable dispersion in water. Among them, C20-22 alcohol phosphate has a special molecular structure, and its addition can adjust the performance of the fluorocarbon-modified polyurethane dispersion. The phosphate group can enhance the intermolecular interaction, making the arrangement of polyurethane molecular chains more compact, thereby improving the stability and mechanical properties of the dispersion. At the same time, the long-chain C20-22 alcohol part can improve the flexibility and water resistance of the dispersion, so that the fluorocarbon-modified polyurethane dispersion obtained ultimately can better adapt to different application environments when applied to water-based coatings. C20-22 alcohol phosphate can play a certain catalytic and promoting role in the reaction, helping the reaction between isophorone diisocyanate, hexafluorobutanediol, and polypropylene ether glycol to proceed more smoothly, enabling the reaction system to be more uniformly mixed, and improving the efficiency of the reaction and the quality of the product.

[0024] The fluorocarbon chain segment, with its unique chemical structure, endows the coating with excellent weather resistance, effectively resisting long-term ultraviolet radiation without degradation and discoloration. Its low surface energy characteristics make the coating have good water resistance, and water droplets are difficult to adhere and penetrate the coating surface. The polyurethane structure endows the coating with good flexibility, enabling it to adapt to slight deformation of energy storage equipment under different environmental conditions, while providing high mechanical strength, enhancing the coating's resistance to wear and impact. When the dispersion is used in conjunction with other resins to form a film, it can significantly enhance the toughness of the entire coating and improve the adhesion of the coating to the energy storage equipment substrate, ensuring that the coating remains firmly attached to the device surface without cracking or falling off when the device vibrates or the temperature changes.

[0025] In the preparation of the zirconium phosphate-polyaniline core-shell flame retardant, the surface modification of zirconium phosphate by γ-aminopropyl triethoxysilane plays a key role. It can introduce organic functional groups on the surface of zirconium phosphate, greatly improving the compatibility between zirconium phosphate and organic matter, and providing a good foundation for the subsequent polymerization of polyaniline on its surface. In an acidic hydrochloric acid aqueous solution environment, ammonium persulfate as an initiator can generate free radicals to initiate the polymerization reaction between aniline molecules. Since zirconium phosphate has been surface treated, aniline preferentially polymerizes on its surface, gradually forming a polyaniline shell layer, thereby constructing a zirconium phosphate-polyaniline core-shell structure. Zirconium phosphate itself has high heat resistance and flame retardancy, and can effectively inhibit the spread and spread of flames in a high temperature environment; polyaniline not only has good electrical conductivity, which can effectively reduce the risk of static accumulation, greatly ensuring the safe operation of energy storage devices which are prone to static, but also has certain antioxidant properties, which can protect zirconium phosphate from oxidation to some extent and prolong its service life. The core-shell structure formed by the combination of the two forms a synergistic expansion carbonization mechanism, enabling the flame retardant to not only improve the flame retardancy of the coating, but also enhance the electrical properties and antioxidant properties of the coating.

[0026] In the water-based coating, ZnNiAl-LDH two-dimensional layered triple metal hydroxide has a special layered structure and ion exchange performance, which can adsorb harmful substances that may exist in the coating system, effectively improving the corrosion resistance of the coating and providing protection for energy storage devices in complex chemical environments. Nano-silicon dioxide can improve the hardness of the coating due to its nanoscale size effect, making it more resistant to friction and scratching; enhance the wear resistance of the coating, prolong the service life of the coating; at the same time, it can also improve the weather resistance of the coating, improve the ability of the coating to resist ultraviolet rays and temperature changes; and in the coating construction process, it can adjust the rheological properties of the coating, making the coating have good leveling properties and ensuring the smoothness of the coating surface. Nano cerium oxide has excellent antioxidant properties, which can effectively inhibit the oxidative degradation reaction of the coating during use; at the same time, it has strong absorption capacity for ultraviolet rays, which can protect the organic components in the coating from being damaged by ultraviolet rays, greatly improving the weather resistance and anti-aging performance of the coating.

[0027] In this coating system, polyaniline can isolate zirconium phosphate, thereby protecting the ZnNiAl-LDH two-dimensional layered triple metal hydroxide from the acidic influence of zirconium phosphate. Zirconium phosphate itself is weakly acidic, but after a series of treatments during the preparation of the zirconium phosphate-polyaniline core-shell flame retardant, the surface of zirconium phosphate is coated with polyaniline to form a core-shell structure. Polyaniline can isolate zirconium phosphate, thereby protecting the ZnNiAl-LDH two-dimensional layered triple metal hydroxide from the acidic influence of zirconium phosphate, which would cause structural damage and dissolution; in addition, other basic and neutral components in the coating also play a certain buffering and adjusting role in the acid-base of the system, together maintaining the stability of the coating system.

[0028] Five, in the water-based paint, water-based epoxy ester resin can react with the active groups on the surface of the energy storage device substrate by virtue of the epoxy groups and ester groups in its molecular structure, thereby providing good adhesion; at the same time, it also has good chemical corrosion resistance, and can resist the erosion of acid, alkali and other chemicals on the coating. Water-based silicone-modified acrylic resin combines the advantages of silicone and acrylic resin, the silicone part gives the coating good weather resistance, heat resistance and water resistance, so that it can be used in outdoor environment for a long time without performance degradation; the acrylic resin part provides good film-forming property and gloss, making the coating have an aesthetic decorative effect. 1-ethoxy-2-propanol as a solvent can adjust the viscosity of the coating, so that it has good flowability and operability during construction; at the same time, it can also control the drying speed of the coating to ensure that the coating forms a uniform and dense structure during drying. C18-36 acid glycol ester has the effect of improving the film-forming property of the coating and improving the density of the coating, in addition, C18-36 acid glycol ester can insert between the high molecular chains of the coating to improve the flexibility of the coating, so that it can maintain good physical properties at low temperature environment and is not prone to brittle fracture. Water-based polycarbodiimide as a crosslinking agent can crosslink with other components in the coating, such as water-based epoxy ester resin, fluorocarbon-modified polyurethane dispersion, etc., to form a three-dimensional network structure between molecules, greatly improving the hardness, wear resistance and water resistance of the coating. Fluorocarbon-modified polyurethane dispersion further enhances the weather resistance, flexibility and mechanical properties of the coating, and synergistically acts with other components, so that the coating can better adapt to the working environment of the energy storage device. Through gradual stirring and mixing, the components interact and fuse with each other to preliminarily form a performance-complementary system.

[0029] In summary, the components synergistically act in the whole system, so that the coating has good weather resistance in terms of protective performance, can resist the influence of ultraviolet light, high and low temperature cycles for a long time, and prevent the coating from chalking and fading; has excellent corrosion resistance, effectively resisting the erosion of acid, alkali, salt and other chemicals; in terms of mechanical properties, it has high hardness and wear resistance, and can withstand daily friction and impact; it also has good adhesion, ensuring that the coating is firmly combined with the surface of the device. In addition, the coating also has special functions such as flame retardance, comprehensively protecting the energy storage device and improving its reliability, safety and service life. DETAILED DESCRIPTION

[0030] The application will be further described below in conjunction with specific implementation examples, but the application is not limited to these examples.

[0031] Example 1

[0032] An aqueous coating for energy storage equipment, comprising raw materials in mass fractions: 13 parts of fluorocarbon modified polyurethane dispersion, 17 parts of water-based epoxy ester resin, 32 parts of water-based silicone modified acrylic resin, 0.6 parts of ZnNiAl-LDH two-dimensional layered triple metal hydroxide, 7 parts of zirconium phosphate-polyaniline core-shell flame retardant, 9 parts of nano silicon dioxide, 5 parts of water-based polycarbodiimide, 1.5 parts of nano cerium oxide, 0.6 parts of polyether modified silicone defoamer, 4 parts of C18-36 acid glycol ester, 0.5 parts of leveling agent, 4 parts of pigment, 6 parts of 1-ethoxy-2-propanol, and the balance is water, solid content 48wt%.

[0033] The preparation method of the fluorocarbon modified polyurethane dispersion comprises the following steps: isophorone diisocyanate 45 parts, hexafluorobutylene glycol 23 parts, polypropylene ether glycol 32 parts and C20-22 alcohol phosphate 4 parts by mass fraction, stirring and mixing uniformly at 80℃ under nitrogen protection, to obtain a mixed solution A, adding 0.06% of dibutyltin dilaurate in the mass of mixed solution A, stirring at 400r / min for 3.5h to obtain a reaction solution B; cooling to 60℃, adding dimethylolpropionic acid 6 parts and acetone 110 parts, continuing to stir at 400r / min for 3.5h, after the reaction is completed, adding triethylamine to neutralize the pH value to 7.5, then adding deionized water 130 parts under high-speed shearing at 4000rpm to form a stable dispersion with a particle size of 200nm or less, and removing acetone and part of deionized water by reduced pressure distillation to obtain a fluorocarbon modified polyurethane dispersion with a solid content of 45wt%.

[0034] The preparation method of the zirconium phosphate-polyaniline core-shell flame retardant comprises the following steps: adding nano-sized zirconium phosphate into 11 times mass of ethanol, ultrasonic dispersion at 200W, 50kHz for 50min, adding 7wt% of γ-aminopropyl triethoxysilane in the mass of zirconium phosphate, stirring at 400r / min for 2.5h, centrifuging at 6000r / min for 15min, washing the precipitate with anhydrous ethanol for 2 times, and vacuum drying at 70℃ for 6h to obtain treated zirconium phosphate; preparing 1.2mol / L hydrochloric acid aqueous solution containing 6.5g / 100mL camphor sulfonic acid; adding the treated zirconium phosphate into 11 times mass of the hydrochloric acid solution, ultrasonic dispersion at 200W, 50kHz for 50min, adding aniline at 4℃ according to the mass ratio of aniline:treated zirconium phosphate=2.5:1, mixing uniformly, then adding 55g / 100mL ammonium persulfate aqueous solution, stirring at 400r / min for 7h, centrifuging at 6000r / min for 15min, washing the precipitate with deionized water and ethanol alternately for 2 times each, and vacuum drying at 70℃ for 6h to obtain the zirconium phosphate-polyaniline core-shell flame retardant.

[0035] The preparation method of the above-mentioned aqueous coating for energy storage equipment comprises the following steps:

[0036] S1: The ZnNiAl-LDH two-dimensional layered triple metal hydroxide, zirconium phosphate-polyphenylamine core-shell flame retardant, nano silicon dioxide and nano cerium oxide were uniformly airflow mixed by mass fraction to obtain a mixed powder;

[0037] S2: The water-based epoxy ester resin, water-based silicone modified acrylic resin and 1-ethoxy-2-propanol were mixed by stirring at 400 r / min for 18 min, then the mixed powder and pigment were added and mixed by stirring at 400 r / min for 18 min, then the polyether modified silicone defoaming agent, leveling agent and C18-36 acid glycol ester were added and mixed by stirring at 400 r / min for 16 min, finally the water-based polycarbodiimide and fluorocarbon modified polyurethane dispersion were added and mixed by stirring at 400 r / min for 16 min to obtain a mixed material;

[0038] S3: The mixed material was transferred to a high-speed dispersion machine and dispersed at 4000 rpm for 50 min, then ground, the grinding medium was zirconium oxide with a particle size of 0.2 mm, the grinding speed was 2000 rpm, the feeding speed was 2.5 L / min, and after grinding, water was added to adjust the solid content of the system to 48 wt%, and then stirred and mixed uniformly at 400 r / min to obtain a water-based paint.

[0039] Example 2

[0040] A water-based paint for energy storage equipment, comprising the following raw materials by mass fraction: 10 parts of fluorocarbon modified polyurethane dispersion, 15 parts of water-based epoxy ester resin, 30 parts of water-based silicone modified acrylic resin, 0.5 parts of ZnNiAl-LDH two-dimensional layered triple metal hydroxide, 6 parts of zirconium phosphate-polyphenylamine core-shell flame retardant, 8 parts of nano silicon dioxide, 4 parts of water-based polycarbodiimide, 1 part of nano cerium oxide, 0.5 parts of polyether modified silicone defoaming agent, 3 parts of C18-36 acid glycol ester, 0.3 parts of leveling agent, 3 parts of pigment, 5 parts of 1-ethoxy-2-propanol, and the balance is water, the solid content is 45 wt%.

[0041] The preparation method of the fluorocarbon modified polyurethane dispersion includes the following steps: under nitrogen protection, 40 parts of isophorone diisocyanate, 20 parts of hexafluorobutylene glycol, 30 parts of polypropylene ether glycol, and 3 parts of C20-22 alcohol phosphate are uniformly mixed at 75 DEG C to obtain a mixed solution A; 0.05% of dibutyltin dilaurate in the mass of the mixed solution A is added, and stirring reaction is carried out at 300 r / min for 3 h to obtain a reaction solution B; the temperature is lowered to 55 DEG C, 5 parts of dimethylol propionic acid and 100 parts of acetone are added, and stirring reaction is continuously carried out at 300 r / min for 3 h; after the reaction is completed, triethylamine is added to neutralize the pH value to 7, then deionized water 120 parts is added under high-speed shearing at 3000 rpm to form a stable dispersion with a particle size of 200 nm or less, and acetone and part of the deionized water are removed by distillation under reduced pressure to obtain a fluorocarbon modified polyurethane dispersion with a solid content of 40 wt%.

[0042] The preparation method of the zirconium phosphate-polyaniline core-shell flame retardant includes the following steps: nano-sized zirconium phosphate is added into 10 times of mass of ethanol, ultrasonic dispersion is carried out at 150 W and 40 kHz for 30 min, 6 wt% of γ-aminopropyl triethoxysilane in the mass of the zirconium phosphate is added, stirring reaction is carried out at 300 r / min for 2 h, centrifugation is carried out at 5000 r / min for 10 min, the precipitate is washed with anhydrous ethanol for 2 times, and vacuum drying is carried out at 60 DEG C for 4 h to obtain treated zirconium phosphate; 1 mol / L of hydrochloric acid aqueous solution containing 5 g / 100 mL of camphor sulfonic acid is prepared; the treated zirconium phosphate is added into 10 times of mass of the hydrochloric acid solution, ultrasonic dispersion is carried out at 150 W and 40 kHz for 30 min, aniline is added at 2 DEG C according to the mass ratio of aniline:treated zirconium phosphate=2:1, the mixture is uniformly mixed, then 50 g / 100 mL of ammonium persulfate aqueous solution is added, stirring polymerization reaction is carried out at 300 r / min for 6 h, centrifugation is carried out at 5000 r / min for 10 min, the precipitate is washed with deionized water and ethanol alternately for 2 times, and vacuum drying is carried out at 60 DEG C for 4 h to obtain the zirconium phosphate-polyaniline core-shell flame retardant.

[0043] The preparation method of the water-based paint for energy storage equipment includes the following steps:

[0044] S1: according to mass parts, the ZnNiAl-LDH two-dimensional layered three-metal hydroxide, the zirconium phosphate-polyaniline core-shell flame retardant, the nano-silicon dioxide, and the nano-cerium oxide are uniformly airflow mixed to obtain a mixed powder;

[0045] S2: by mass fraction, the water-based epoxy ester resin, water-based silicone modified acrylic resin and 1-ethoxy-2-propanol, stirring mixing at 300 r / min for 15 min, then add mixed powder and pigment, 300 r / min stirring mixing for 15 min, then add polyether modified silicone defoamer, leveling agent, C18-36 acid glycol ester, 300 r / min stirring mixing for 15 min, finally add water-based polycarbodiimide and fluorocarbon modified polyurethane dispersion, 300 r / min stirring mixing for 15 min, to get the mixture;

[0046] S3: the mixture is transferred to a high-speed dispersion machine, and high-speed dispersion is carried out at 3000 rpm for 30 min, and then grinding is carried out, the grinding medium is selected to be zirconium oxide with a particle size of 0.1 mm, the grinding speed is 1500 rpm; the feeding speed is 2 L / min, and after grinding, water is added to adjust the solid content of the system to 45 wt%, and then uniform stirring mixing is carried out at 300 r / min, to obtain the water-based paint.

[0047] Example 3

[0048] A water-based paint for energy storage equipment, comprising the following raw materials by mass fraction: 15 parts of fluorocarbon modified polyurethane dispersion, 20 parts of water-based epoxy ester resin, 35 parts of water-based silicone modified acrylic resin, 1 part of ZnNiAl-LDH two-dimensional layered three-metal hydroxide, 8 parts of zirconium phosphate-polyaniline core-shell flame retardant, 10 parts of nano silicon dioxide, 6 parts of water-based polycarbodiimide, 2 parts of nano cerium oxide, 0.8 parts of polyether modified silicone defoamer, 5 parts of C18-36 acid glycol ester, 0.8 parts of leveling agent, 6 parts of pigment, 8 parts of 1-ethoxy-2-propanol, and the balance is water, the solid content is 50 wt%.

[0049] The preparation method of the fluorocarbon modified polyurethane dispersion comprises the following steps: under nitrogen protection, isophorone diisocyanate 50 parts, hexafluorobutylene glycol 25 parts, polypropylene ether glycol 35 parts and C20-22 alcohol phosphate 5 parts are uniformly stirred and mixed at 85℃ to obtain a mixed solution A, 0.08% of dibutyltin dilaurate is added to the mixed solution A, and stirring reaction is carried out at 500 r / min for 4 h to obtain a reaction solution B; the temperature is lowered to 65℃, 8 parts of dimethylol propionic acid and 120 parts of acetone are added, and stirring reaction is continuously carried out at 500 r / min for 4 h; after the reaction is completed, triethylamine is added to neutralize the pH value to 8, then deionized water 150 parts is added under high-speed shearing at 5000 rpm to form a stable dispersion with a particle size of 200 nm or less, and acetone and part of the deionized water are removed by reduced pressure distillation to obtain a fluorocarbon modified polyurethane dispersion with a solid content of 50 wt%.

[0050] The preparation method of the zirconium phosphate-polyaniline core-shell flame retardant includes the following steps: adding nano-sized zirconium phosphate into 12 times of mass of ethanol, ultrasonic dispersing for 60 min at 250 W and 60 kHz, adding 8 wt% of the mass of the zirconium phosphate of γ-aminopropyl triethoxysilane, stirring and reacting for 3 h at 500 r / min, centrifuging at 8000 r / min for 20 min, washing the precipitate with anhydrous ethanol for 3 times, and vacuum drying at 80℃ for 8 h to obtain treated zirconium phosphate; preparing a 1.5 mol / L hydrochloric acid aqueous solution containing 8 g / 100 mL of camphor sulfonic acid; adding the treated zirconium phosphate into 12 times of mass of the hydrochloric acid solution, ultrasonic dispersing for 60 min at 250 W and 60 kHz, adding aniline at a mass ratio of aniline:treated zirconium phosphate = 3:1 at 6℃, mixing uniformly, then adding an ammonium persulfate aqueous solution with a concentration of 60 g / 100 mL, stirring and polymerizing for 8 h at 500 r / min, centrifuging at 8000 r / min for 20 min, washing the precipitate with deionized water and ethanol alternately for 3 times, and vacuum drying at 80℃ for 8 h to obtain the zirconium phosphate-polyaniline core-shell flame retardant.

[0051] The preparation method of the water-based paint for energy storage equipment includes the following steps:

[0052] S1: uniformly airflow-mixing, by mass fraction, ZnNiAl-LDH two-dimensional layered three-metal hydroxide, zirconium phosphate-polyaniline core-shell flame retardant, nano-silicon dioxide and nano-cerium oxide to obtain a mixed powder;

[0053] S2: stirring and mixing, by mass fraction, water-based epoxy ester resin, water-based silicone-modified acrylic resin and 1-ethoxy-2-propanol at 500 r / min for 20 min, then adding the mixed powder and pigments, stirring and mixing at 500 r / min for 20 min, then sequentially adding polyether-modified silicone defoaming agent, leveling agent, C18-36 acid glycol ester, stirring and mixing at 500 r / min for 20 min, and finally adding water-based polycarbodiimide and fluorocarbon-modified polyurethane dispersion, stirring and mixing at 500 r / min for 20 min to obtain a mixed material;

[0054] S3: transferring the mixed material to a high-speed dispersion machine, high-speed dispersing at 5000 rpm for 60 min, and then grinding, with zirconium oxide with a particle size of 0.3 mm as the grinding medium and a grinding speed of 2500 rpm; the feeding speed is 3 L / min, and after grinding, water is added to adjust the solid content of the system to 50 wt%, and then stirring and mixing uniformly at 500 r / min to obtain the water-based paint.

[0055] In the above examples: the waterborne epoxy ester resin is from Foshan Guangsha New Material Technology Co., Ltd., model WX-SH, solid content 70wt%, molecular weight 10000-12000. The waterborne silicone modified acrylic resin is from Qingdao Wanjiahuxin Surface Material Technology Co., Ltd., model S-611, solid content 40wt%, viscosity 3500-4000(S). The ZnNiAl-LDH two-dimensional layered three-metal hydroxide is from Jiangsu Xianfeng Nanometer Material Technology Co., Ltd., model XFL03. The nano-silicon dioxide is from Nanjing Baokete New Material Co., Ltd., model PST-Q02. The waterborne polycarbodiimide is from Shanghai Youen Chemical Co., Ltd., multifunctional polycarbodiimide, model UN-557. The nano-cerium oxide is from Hangzhou Jiupeng New Material Co., Ltd. The polyether modified silicone defoamer is from Shanghai Huiyan New Material Co., Ltd., model HY-6803. The C18-36 acid glycol ester is from Beijing Huamei Huli Biological Chemical Co., Ltd. The leveling agent is from Guangdong Zhongtai Lianhua New Material Co., Ltd., model AG-295, composed of polyether modified polysiloxane polymer. The polypropylene oxide ether dihydric alcohol is from Shandong Baichong New Material Co., Ltd., model DL4000D. The C20-22 alcohol phosphate is from Hubei Xinyu Hong Biological Medicine Technology Co., Ltd. The zirconium phosphate is from Mianzhu Yaolong Chemical Co., Ltd., nano grade. The γ-aminopropyl triethoxysilane is from Shandong Moore Chemical Co., Ltd., model 101. The camphor sulfonic acid is from Shanghai Aojij Chemical Co., Ltd., racemic camphor sulfonic acid.

[0056] Comparative Example 1

[0057] In the coating, the fluorocarbon modified polyurethane dispersion is replaced by a waterborne polyurethane emulsion with a solid content of 45wt% (polyurethane from Anhui Feisun Chemical Co., Ltd., model FS-108C); other parameters and methods are the same as in Example 1.

[0058] Comparative Example 2

[0059] In the preparation method of the fluorocarbon modified polyurethane dispersion, C20-22 alcohol phosphate is not added; other parameters and methods are the same as in Example 1.

[0060] Comparative Example 3

[0061] In the preparation method of the fluorocarbon modified polyurethane dispersion, C20-22 alcohol phosphate is added by 15 parts (excess); other parameters and methods are the same as in Example 1.

[0062] Comparative Example 4

[0063] In the coating, the zirconium phosphate-polyaniline core-shell flame retardant is replaced by zirconium phosphate; other parameters and methods are the same as in Example 1.

[0064] Comparative Example 5

[0065] In the preparation method of the zirconium phosphate-polyaniline core-shell flame retardant, the zirconium phosphate is not subjected to surface pretreatment with γ-aminopropyl triethoxysilane; other parameters and methods are the same as in Example 1.

[0066] Comparative Example 6

[0067] In the coating, the ZnNiAl-LDH two-dimensional layered triple metal hydroxide is not added; other parameters and methods are the same as in Example 1.

[0068] Comparative Example 7

[0069] In the coating, the C18-36 acid glycol ester is not added; other parameters and methods are the same as in Example 1.

[0070] Comparative Example 8

[0071] In the coating, the zirconium phosphate-polyaniline core-shell flame retardant is replaced with zirconium phosphate; the ZnNiAl-LDH two-dimensional layered triple metal hydroxide is not added; other parameters and methods are the same as in Example 1.

[0072] For convenient detection, the pigment in each coating is iron oxide red, and the coating thickness of the sample is 80 μm; the performance of each coating is detected.

[0073] 1. Weather resistance: according to GB / T 1865 “Artificial Weathering and Artificial Radiation Exposure (Filtered Xenon Arc Radiation) of Paints and Varnishes”, the prepared 150 mm x 70 mm x 1 mm coating sample plate is placed in a xenon lamp aging test box. Set the blackboard temperature to 65°C, the relative humidity to 50%, the light exposure time to 102 min, and the water spraying time to 18 min as one cycle, and continuously conduct a 1000 h test. After the test is completed, according to GB / T 1766 “Rating Method for Aging of Paint and Varnish Coatings”, the powdering (0-5 levels, 0 level no powdering, 5 level severe powdering) of the coating is rated. The results are shown in Table 1 below.

[0074] 2. Corrosion resistance: according to GB / T 1771 “Determination of the Resistance to Neutral Salt Spray of Paints and Varnishes”, the 150 mm x 100 mm x 1 mm coating sample plate is placed in a salt spray test box, and a 5wt% sodium chloride solution is used to conduct a test under the condition of continuous spraying at a temperature of 35°C. The sample plate is observed every 24 h, and the time of occurrence of corrosion phenomena (at least one of blistering, rusting and peeling) is recorded. The results are shown in Table 1 below.

[0075] 3. Hardness: according to GB / T 6739 “Determination of Paint Film Hardness by Pencil Method”, different hardness specifications of pencils are sharpened and flattened on a 400# water sandpaper plane, and a 1 cm long line segment is drawn on the coating surface at an angle of 45° with a force of 1 kg, and each hardness test is conducted 3 times. The maximum pencil hardness at which the coating is not scratched indicates the hardness of the coating. The results are shown in Table 1 below.

[0076] 4. Abrasion resistance: According to GB / T 1768 "Determination of abrasion resistance of paints and varnishes - Rotating cylindrical abrasive method", using Taber abrasion tester, loading 500g weight, selecting CS-17 rubber wheel, frictioning 100mm x 100mm x 1mm coated panel at 100r / min, weighing once every 200 times of friction until the coating is worn out to expose the substrate, recording the friction times when worn out. The results are shown in Table 1 below.

[0077] 5. Adhesion: According to GB / T 9286 "Cross-hatch test for paint and varnish films", 10 x 10 1mm squares are drawn on the surface of 100mm x 100mm x 1mm coated panel with a cross-hatch cutter, ensuring the cutter is perpendicular and the force is uniform, and drawing through the coating to the substrate. Then 3M600 tape is pasted on the cross-hatched area, flattened with fingers to ensure the tape is in full contact with the coating, and then the tape is quickly pulled up at an angle of 90°, rated according to 0-5 grade (0 grade no falling off, 5 grade falling off area >65%). The results are shown in Table 1 below.

[0078] 6. Flame retardancy: According to UL94 vertical burning test standard, 125mm x 13mm x 3mm coated panel is prepared. The panel is vertically fixed on the burning test device, and a bunsen burner flame (height 20mm±2mm, temperature 1000℃±50℃) is applied at the bottom of the panel for 10s, then the flame is removed, and the burning time of the panel, whether there is molten droplet and re-ignition are recorded, and the flame retardant grade (V-0, V-1, V-2, HB, etc., V-0 grade has the best flame retardant performance) is determined according to the standard. The results are shown in Table 1 below.

[0079] Table 1 Performance test results

[0080]

[0081] From the above results, it can be seen that the water-based paint of Example 1 to Example 3 has excellent weather resistance, corrosion resistance and flame retardancy, and high hardness, good abrasion resistance and strong adhesion.

[0082] Comparative Example 1 uses a common waterborne polyurethane emulsion to replace the fluorocarbon-modified polyurethane dispersion. Fluorocarbon groups have excellent resistance to UV light due to their highly stable carbon-fluorine bond, which can effectively prevent the degradation of the coating under light. The common waterborne polyurethane emulsion lacks this stable structure, and under long-term UV irradiation, the polymer chain segments are prone to breakage and oxidation, leading to more serious powdering and discoloration. The coating structure formed by the fluorocarbon-modified polyurethane dispersion is more compact, effectively blocking the penetration of corrosive media. The molecular arrangement of the common waterborne polyurethane emulsion coating is relatively loose, and chloride ions in the sodium chloride solution can more easily penetrate the coating to reach the metal substrate, causing corrosion. The fluorocarbon-modified polyurethane dispersion enables the coating to have tighter intermolecular interactions and stronger cohesion, resulting in higher hardness and wear resistance. The intermolecular forces of the common waterborne polyurethane emulsion are weaker, and when subjected to external force friction, the molecular chains are more prone to displacement and breakage. The adhesion of the common waterborne polyurethane emulsion to the substrate is relatively weak, and in the cross-hatch test, the tape is more likely to lift the coating from the substrate, leading to a decrease in adhesion rating. The fluorocarbon-modified polyurethane dispersion has a synergistic effect with other flame-retardant components in the system, collectively improving the flame-retardant properties of the coating. The replacement of the common waterborne polyurethane emulsion disrupts this synergistic relationship.

[0083] Comparative Example 2 does not add C20-22 alcohol phosphate. C20-22 alcohol phosphate participates in the construction of the molecular structure during the synthesis of the fluorocarbon-modified polyurethane dispersion, affecting the regularity and stability of the polymer. Without it, the molecular structure of the coating has defects, and under UV and thermal oxygen environments, it is more prone to chemical bond breakage and decomposition, leading to decreased weather resistance. Structural defects reduce the shielding performance of the coating, making it difficult to effectively block corrosive media. Irregular structures affect intermolecular interactions, affecting the hardness and wear resistance of the coating, and also affecting flame retardancy.

[0084] In Comparative Example 3, C20-22 alcohol phosphate is added in excess. Excessive C20-22 alcohol phosphate disrupts the balance of the reaction system, interfering with the growth and crosslinking of the polymer molecular chain, resulting in uneven molecular structure. This uneven structure is more prone to aging and degradation under the action of UV light and thermal oxygen, resulting in poor weather resistance. The uneven structure reduces the compactness of the coating, making it easier for corrosive media to penetrate. The chaotic molecular structure leads to weakened intermolecular forces, reducing hardness and wear resistance. Changes in structure affect the chemical bonding and physical adsorption between the coating and the substrate, leading to decreased adhesion. Excessive C20-22 alcohol phosphate interferes with the performance of the fluorocarbon-modified polyurethane dispersion and its synergistic effect with the flame retardant, resulting in reduced flame retardant properties.

[0085] Comparative Example 4 uses zirconium phosphate instead of zirconium phosphate-polyaniline core-shell flame retardant. Polyaniline has certain redox activity and corrosion inhibition effect, which can form a protective film on the metal surface to inhibit the corrosion of the metal and protect the ZnNiAl-LDH two-dimensional layered three-metal hydroxide from the acidity of zirconium phosphate. When only zirconium phosphate is used, the protective effect of polyaniline is missing, and the corrosion resistance of the coating is reduced. The core-shell structure formed by polyaniline and zirconium phosphate enhances the mechanical properties of the coating. After replacement, the hardness and wear resistance of the coating are reduced. The conjugated structure of polyaniline and the protection of ZnNiAl-LDH two-dimensional layered three-metal hydroxide from the influence contribute significantly to improving the flame retardant performance of the coating, and the flame retardant grade decreases after replacing only zirconium phosphate.

[0086] Comparative Example 5 does not perform surface pretreatment on zirconium phosphate. The surface of zirconium phosphate is pretreated with γ-aminopropyl triethoxysilane to enhance the bonding force between zirconium phosphate and polyaniline and form a stable core-shell structure. Without treatment, the bonding between the two is not firm and will peel off during high-speed dispersion and grinding, and zirconium phosphate will also affect the ZnNiAl-LDH two-dimensional layered three-metal hydroxide, and the indicators will decrease, with performance close to that of Comparative Example 4.

[0087] Comparative Example 6 does not add ZnNiAl-LDH two-dimensional layered three-metal hydroxide. ZnNiAl-LDH has a special layered structure and can block and ion exchange buffer corrosive media. Without it, the shielding performance of the coating decreases, and ions in the sodium chloride solution are more likely to reach the metal substrate, accelerating corrosion. The presence of ZnNiAl-LDH helps to enhance the overall mechanical properties of the coating, and without it, the hardness and wear resistance will decrease slightly. ZnNiAl-LDH can have a synergistic effect with other flame-retardant components, and the lack of it will reduce the flame-retardant grade.

[0088] Comparative Example 7 does not add C18-36 acid glycol ester. C18-36 acid glycol ester has the effect of improving the film-forming performance of the coating and increasing the density of the coating. Without it, the density of the coating decreases, and the performance decreases.

[0089] Comparative Example 8 replaces the zirconium phosphate-polyaniline core-shell flame retardant and does not add ZnNiAl-LDH two-dimensional layered three-metal hydroxide. Without polyaniline and ZnNiAl-LDH, the coating loses their protection against ultraviolet light and heat oxygen and structural enhancement, and is more susceptible to aging under ultraviolet light. Without the corrosion inhibition effect of polyaniline and the barrier effect of ZnNiAl-LDH, the metal substrate is prone to corrosion. Due to the lack of key reinforcing components, the mechanical properties of the coating are greatly reduced. The instability of the structure and the lack of components result in poor adhesion of the coating to the substrate. Without the synergistic effect of polyaniline and ZnNiAl-LDH with other flame-retardant components, the flame-retardant performance is reduced.

Claims

1. A water-based coating for energy storage devices, characterized in that, The water-based coating comprises the following raw materials in parts by weight: 10-15 parts fluorocarbon modified polyurethane dispersion, 15-20 parts water-based epoxy ester resin, 30-35 parts water-based silicone modified acrylic resin, 0.5-1 part ZnNiAl-LDH two-dimensional layered trimetallic hydroxide, 6-8 parts zirconium phosphate-polyaniline core-shell flame retardant, 8-10 parts nano silica, 4-6 parts water-based polycarbodiimide, 1-2 parts nano cerium oxide, 0.5-0.8 parts polyether modified silicone defoamer, 3-5 parts C18-36 glycol ester, 0.3-0.8 parts leveling agent, 3-6 parts pigment, 5-8 parts 1-ethoxy-2-propanol, with the balance being water, and a solid content of 45wt%-50wt%. The preparation method of the fluorocarbon modified polyurethane dispersion includes the following steps: 40-50 parts by mass of isophorone diisocyanate, 20-25 parts by mass of hexafluorobutylene glycol, 30-35 parts by mass of polyoxypropylene ether diol, and 3-5 parts by mass of C20-22 phosphate ester are stirred and mixed uniformly at 75℃-85℃ under nitrogen protection to obtain mixture A. Dibutyltin dilaurate is added, and the mixture is stirred to obtain reaction solution B. The temperature is lowered to 55℃-65℃, and 5-8 parts by mass of dimethylolpropionic acid and 100-120 parts by mass of acetone are added. The mixture is stirred and reacted continuously. After the reaction is completed, triethylamine is added to neutralize the pH to 7-8. Then, under high-speed shearing, 120-150 parts by mass of deionized water are added to form a stable dispersion with a particle size of less than 200 nm. Acetone and some deionized water are removed by vacuum distillation to obtain a fluorocarbon modified polyurethane dispersion with a solid content of 40wt%-50wt%. The preparation method of the zirconium phosphate-polyaniline core-shell flame retardant includes the following steps: zirconium phosphate is added to ethanol and ultrasonically dispersed evenly. 6wt%–8wt% of γ-aminopropyltriethoxysilane is added, and the mixture is stirred for 2–3 hours. After centrifugation, the precipitate is washed with anhydrous ethanol and dried to obtain treated zirconium phosphate. The treated zirconium phosphate is added to hydrochloric acid solution and ultrasonically dispersed. Aniline is added at a mass ratio of aniline:treated zirconium phosphate = (2–3):1 at 2℃–6℃ and mixed evenly. Then, ammonium persulfate aqueous solution is added, and the polymerization reaction is stirred for 6–8 hours. After centrifugation, the precipitate is washed alternately with deionized water and ethanol and dried to obtain the zirconium phosphate-polyaniline core-shell flame retardant.

2. The water-based coating for energy storage devices according to claim 1, characterized in that, In the preparation method of fluorocarbon modified polyurethane dispersion, the amount of dibutyltin dilaurate added is 0.05% to 0.08% of the mass of mixture A.

3. The water-based coating for energy storage devices according to claim 1, characterized in that, In the preparation method of fluorocarbon modified polyurethane dispersion, the stirring speed is 300 r / min to 500 r / min; the stirring time is 3 h to 4 h; and the high-speed shearing speed is 3000 rpm to 5000 rpm.

4. The water-based coating for energy storage devices according to claim 1, characterized in that, In the preparation method of zirconium phosphate-polyaniline core-shell flame retardant, the zirconium phosphate has a particle size of nanometers; the amount of ethanol used is 10 to 12 times the mass of zirconium phosphate; the amount of hydrochloric acid solution used is 10 to 12 times the mass of the treated zirconium phosphate; the hydrochloric acid solution is a 1 mol / L to 1.5 mol / L hydrochloric acid aqueous solution, containing 5 g / 100 mL to 8 g / 100 mL of camphor sulfonic acid; and the concentration of the ammonium sulfate aqueous solution is 50 g / 100 mL to 60 g / 100 mL.

5. The water-based coating for energy storage devices according to claim 1, characterized in that, In the preparation method of zirconium phosphate-polyaniline core-shell flame retardant, the ultrasonic dispersion frequency is 40kHz to 60kHz, the power is 150W to 250W, and the time is 30min to 60min; the stirring speed is 300r / min to 500r / min; and the centrifugation is performed at 5000r / min to 8000r / min for 10min to 20min.

6. The water-based coating for energy storage devices according to claim 1, characterized in that, In the preparation method of zirconium phosphate-polyaniline core-shell flame retardant, the anhydrous ethanol washing is performed 2 to 3 times; the deionized water and ethanol are alternately washed 2 to 3 times each; and the drying is performed under vacuum at 60℃ to 80℃ for 4 to 8 hours.

7. The method for preparing an aqueous coating for energy storage devices according to claim 1, characterized in that, Includes the following steps: S1: According to the mass fractions, ZnNiAl-LDH two-dimensional layered trimetallic hydroxide, zirconium phosphate-polyaniline core-shell flame retardant, nano silica and nano cerium oxide are mixed evenly by airflow to obtain a mixed powder; S2: According to the mass fractions, waterborne epoxy ester resin, waterborne silicone-modified acrylic resin and 1-ethoxy-2-propanol are stirred and mixed, then mixed powder and pigment are added and stirred and mixed. Then, polyether-modified silicone defoamer, leveling agent and C18-36 acid glycol ester are added in sequence and stirred and mixed. Finally, waterborne polycarbodiimide and fluorocarbon-modified polyurethane dispersion are added and stirred and mixed to obtain the mixture. S3: Transfer the mixture to a high-speed disperser for high-speed dispersion, then grind it, add water to adjust the solid content of the system to 45wt%~50wt%, stir and mix evenly to obtain water-based coating.

8. The method for preparing an aqueous coating for energy storage devices according to claim 7, characterized in that, The stirring and mixing speed is 300 r / min to 500 r / min, and the stirring and mixing time is 15 min to 20 min. The high-speed dispersion is carried out at 3000 rpm to 5000 rpm for 30 min to 60 min. The grinding parameters are as follows: the grinding media is zirconium oxide with a particle size of 0.1 mm to 0.3 mm, the grinding speed is 1500 rpm to 2500 rpm, and the feed rate is 2 L / min to 3 L / min.

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