Insulating powder coating for new energy automobile battery and preparation method of insulating powder coating

Abstract

The invention relates to the technical field of powder coatings, in particular to an insulating powder coating for a new energy automobile battery and a preparation method of the insulating powder coating, and the insulating powder coating comprises the following raw materials in parts by weight: 20-25 parts of epoxy resin, 40-45 parts of fluorocarbon resin, 10-15 parts of polyester resin, 5-8 parts of a modified filler, 4-7 parts of a functional combination agent, 2-3 parts of a flatting agent, 3-5 parts of a curing agent and 2-4 parts of benzoin. According to the insulating powder coating disclosed by the invention, the epoxy resin is matched with the fluorocarbon resin and the polyester resin, the flatting agent, the curing agent and the benzoin are added as functional aids, and the added modified filler and the functional combination agent are mutually blended, so that the breakdown strength, the wear resistance and the impact resistance of the obtained product are harmoniously improved; and the product has remarkable electrolyte-resistant and heat-resistant stability effects.

Description

Technical Field

[0001] The present invention relates to the technical field of powder coatings, and in particular to an insulating powder coating for new energy vehicle batteries and a preparation method thereof. Background Art

[0002] Powder coating is a solid powdered synthetic resin coating composed of solid resin, pigment, filler and additives. Unlike ordinary solvent-based coatings and water-based coatings, its dispersion medium is not solvent and water, but air. It has the characteristics of no solvent pollution, 100% film formation and low energy consumption. Powder coatings are divided into two categories: thermoplastic and thermosetting.

[0003] Existing powder coatings used in automotive batteries have poor breakdown strength performance, as well as poor wear resistance and impact resistance. It is difficult to achieve coordinated improvements in breakdown strength, wear resistance and impact resistance. In addition, the product has poor electrolyte resistance and heat stability, which limits the product's use efficiency. Summary of the invention

[0004] In view of the defects of the prior art, the purpose of the present invention is to provide an insulating powder coating for new energy vehicle batteries and a preparation method thereof, so as to solve the problems raised in the above background technology.

[0005] The present invention solves the technical problem by adopting the following technical solution: The present invention provides an insulating powder coating for new energy vehicle batteries, comprising the following raw materials in parts by weight: 20-25 parts of epoxy resin, 40-45 parts of fluorocarbon resin, 10-15 parts of polyester resin, 5-8 parts of modified filler, 4-7 parts of functional combination agent, 2-3 parts of leveling agent, 3-5 parts of curing agent, 2-4 parts of benzoin; The preparation method of the modified filler is: Firstly, the first filler liquid and the second filler liquid are mixed and ultrasonically treated to obtain a filler modified liquid, and then the calcium zirconate additive and the filler modified liquid are mixed and ball-milled to obtain a modified filler agent; The preparation method of the functional combination agent is: Silicon carbide fiber, nano titanium dioxide and sodium stearate are added to sodium dodecylbenzene sulfonate solution and mixed fully to obtain a linking liquid, and then boron nitride and the linking liquid are stirred fully, and then filtered and dried to obtain a functional combining agent.

[0006] Preferably, the insulating powder coating comprises the following raw materials in parts by weight: 22.5 parts of epoxy resin, 42.5 parts of fluorocarbon resin, 12.5 parts of polyester resin, 6.5 parts of modified filler, 5.5 parts of functional combining agent, 2.5 parts of leveling agent, 4 parts of curing agent, and 3 parts of benzoin.

[0007] Preferably, the epoxy resin is epoxy resin E12, the hydroxyl value of the fluorocarbon resin is 44-46 mgKOH / g, and the polyester resin is a carboxyl polyester resin with an acid value of 35 mgKOH / g; The curing agent is dimethylimidazole; the leveling agent is BYK-368P.

[0008] Preferably, the preparation method of the modified filler is as follows: S01: Preparation of the first filler liquid: S01a: Mix nano-silica sol, sodium silicate solution and carboxymethyl cellulose evenly according to the weight ratio of (2-3):(5-7):1 to obtain a sodium silicate solution; S01b: Irradiate barium titanate in a proton irradiation box for 1 h, with an irradiation power of 350-400 W. After irradiation, preheat the irradiated barium titanate at 55-60 °C for 1 h to obtain pretreated barium titanate; Add 4-7 parts of pretreated barium titanate to 5-8 parts of the sodium silicate solution and stir evenly to obtain the first filler liquid; S02: Add 3-5 parts of polytetrafluoroethylene and 2-4 parts of cordierite into 5-8 parts of a 5% hydrochloric acid dopamine solution and mix well to obtain the second filler liquid; Mix the first filler liquid and the second filler liquid according to the weight ratio of (5-7):4 and perform ultrasonic treatment to obtain a filler modification liquid; S03: Mix the calcium zirconate additive and the filler modification liquid according to the weight ratio of (5-6):3, perform ball milling treatment at a ball milling speed of 1000-1500 r / min for 2 h. After ball milling, perform suction filtration and drying to obtain the modified filler.

[0009] Preferably, the mass fraction of the sodium silicate solution is 4-6%; the ultrasonic power of the ultrasonic treatment is 400-500 W, and the ultrasonic treatment is performed for 2 h.

[0010] Preferably, the preparation method of the calcium zirconate additive is as follows: Mix montmorillonite, manganese nitride and sodium lignosulfonate solution evenly according to the weight ratio of (2-5):1:(3-4) to obtain a montmorillonite solution; Mix 4-6 parts of calcium zirconate, 2-3 parts of the montmorillonite solution and 1-2 parts of urea, perform ball milling treatment at a ball milling speed of 1500 r / min for 2 h. After ball milling, perform suction filtration and drying to obtain the calcium zirconate additive.

[0011] Preferably, the mass fraction of the sodium lignosulfonate solution is 5-8%.

[0012] Preferably, the preparation method of the functional coupling agent is as follows: S01: Mix boron nitride thoroughly in a sufficient amount of 5% potassium permanganate solution, then wash with water, perform suction filtration and drying; S02: 3-5 parts of silicon carbide fiber, 2-3 parts of nano titanium dioxide, and 1-2 parts of sodium stearate are added to 5-8 parts of sodium dodecylbenzene sulfonate solution and mixed thoroughly to obtain a crosslinking liquid; The boron nitride of S01 and the linking liquid are fully stirred in a weight ratio of 3:5, and then filtered and dried to obtain a functional combining agent.

[0013] Preferably, the mass fraction of the sodium dodecylbenzene sulfonate solution is 5-8%.

[0014] The present invention also provides a method for preparing an insulating powder coating for a new energy vehicle battery, comprising the following steps: The raw materials are weighed according to weight, and then mixed evenly to obtain a mixture, which is fed into a twin-screw extruder for extrusion at a temperature of 110° C., followed by tableting, cooling, crushing, and sieving through 100 meshes to obtain an insulating powder coating.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The insulating powder coating of the present invention adopts epoxy resin, fluorocarbon resin and polyester resin, and the leveling agent, curing agent and benzoin are added as functional additives, and the modified filler and functional combining agent are added to coordinate with each other, so that the breakdown strength, wear resistance and impact resistance of the obtained product are improved, and the product has remarkable electrolyte resistance and heat resistance stability. The modified filler is improved by ball milling with a filler modified liquid using a calcium zirconate additive. The first filler liquid and the second filler liquid in the filler modified liquid are blended and ultrasonically prepared. The barium titanate in the first filler liquid is optimized by proton irradiation to stimulate the active efficiency, and then is blended and improved by a sodium silicate liquid. The nano silica sol, sodium silicate solution and carboxymethyl cellulose in the sodium silicate liquid are blended and improved. The first filler liquid is prepared by blending and optimizing the raw materials. Meanwhile, polytetrafluoroethylene and cordierite in the second filler liquid are blended and matched with a 5% hydrochloric acid dopamine solution by mass. The first filler liquid is coordinated by blending and coordinating the raw materials to prepare a filler modified liquid to improve the calcium zirconate additive. The calcium zirconate additive is improved by blending and ball milling with calcium zirconate, montmorillonite liquid and urea. The montmorillonite, manganese nitride and sodium lignin sulfonate solution in the montmorillonite liquid are blended and optimized into the system. The lamellar montmorillonite is used to blend manganese nitride and calcium zirconate, thereby co-adjusting the modified filler. The modified filler prepared further optimizes the performance effect of the product in the system. The boron nitride in the functional combining agent is optimized and improved by potassium permanganate solution to improve its activity efficiency. At the same time, the combining liquid is improved and optimized. The silicon carbide fiber and nano-titanium dioxide in the combining liquid are blended with raw materials such as sodium stearate. The fiber structure of the silicon carbide fiber is combined with raw materials such as nano-titanium dioxide to reinforce the system structure. The resulting functional combining agent and modified filler have a better synergistic effect, and the performance of the product is further improved. DETAILED DESCRIPTION

[0016] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with specific embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] The insulating powder coating for a new energy vehicle battery of this embodiment includes the following raw materials in parts by weight: 20-25 parts of epoxy resin, 40-45 parts of fluorocarbon resin, 10-15 parts of polyester resin, 5-8 parts of modified filler, 4-7 parts of functional combination agent, 2-3 parts of leveling agent, 3-5 parts of curing agent, 2-4 parts of benzoin; The preparation method of the modified filler is: Firstly, the first filler liquid and the second filler liquid are mixed and ultrasonically treated to obtain a filler modified liquid, and then the calcium zirconate additive and the filler modified liquid are mixed and ball-milled to obtain a modified filler agent; The preparation method of the functional combination agent is: Silicon carbide fiber, nano titanium dioxide and sodium stearate are added to sodium dodecylbenzene sulfonate solution and mixed fully to obtain a linking liquid, and then boron nitride and the linking liquid are stirred fully, and then filtered and dried to obtain a functional combining agent.

[0018] The insulating powder coating of this embodiment includes the following raw materials in parts by weight: 22.5 parts of epoxy resin, 42.5 parts of fluorocarbon resin, 12.5 parts of polyester resin, 6.5 parts of modified filler, 5.5 parts of functional combining agent, 2.5 parts of leveling agent, 4 parts of curing agent, and 3 parts of benzoin.

[0019] The epoxy resin in this embodiment is epoxy resin E12, the fluorocarbon resin has a hydroxyl value of 44-46 mgKOH / g, and the polyester resin is a carboxyl polyester resin with an acid value of 35 mgKOH / g; The curing agent is dimethylimidazole; the leveling agent is BYK-368P.

[0020] The preparation method of the modified filler of this embodiment is: S01: Preparation of the first filling liquid: S01a: Mix the nano-silica sol, sodium silicate solution and carboxymethyl cellulose in a weight ratio of (2-3): (5-7): 1 to obtain a sodium silicate solution; S01b: irradiating barium titanate in a proton irradiation box for 1 hour at an irradiation power of 350-400W. After the irradiation, preheating the irradiated barium titanate at 55-60°C for 1 hour to obtain pretreated barium titanate; 4 to 7 parts of pretreated barium titanate are added to 5 to 8 parts of sodium silicate solution and stirred evenly to obtain the first filler liquid; S02: 3 to 5 parts of polytetrafluoroethylene and 2 to 4 parts of cordierite are blended and added to 5 to 8 parts of 5% hydrochloric acid dopamine solution by mass and mixed thoroughly to obtain the second filler liquid; The first filler liquid and the second filler liquid are blended and ultrasonically treated according to a weight ratio of (5 to 7):4 to obtain a filler modification liquid; S03: The calcium zirconate additive and the filler modification liquid are blended and ball-milled according to a weight ratio of (5 to 6):3, the ball-milling speed is 1000 to 1500 r / min, ball-milling is carried out for 2 h, after ball-milling is completed, suction filtration and drying are carried out to obtain a modified filler agent.

[0021] In this embodiment, the mass fraction of the sodium silicate solution is 4 to 6%; the ultrasonic power of the blending and ultrasonic treatment is 400 to 500 W, and ultrasonic treatment is carried out for 2 h.

[0022] The preparation method of the calcium zirconate additive in this embodiment is as follows: Montmorillonite, manganese nitride and sodium lignosulfonate solution are blended evenly according to a weight ratio of (2 to 5):1:(3 to 4) to obtain a montmorillonite liquid; 4 to 6 parts of calcium zirconate, 2 to 3 parts of the montmorillonite liquid and 1 to 2 parts of urea are blended and ball-milled, the ball-milling speed is 1500 r / min, ball-milling is carried out for 2 h, after ball-milling is completed, suction filtration and drying are carried out to obtain a calcium zirconate additive.

[0023] In this embodiment, the mass fraction of the sodium lignosulfonate solution is 5 to 8%.

[0024] The preparation method of the functional coupling agent in this embodiment is as follows: S01: Boron nitride is mixed thoroughly in a sufficient amount of 5% potassium permanganate solution by mass, and then washed with water, suction filtered and dried; S02: 3 to 5 parts of silicon carbide fiber, 2 to 3 parts of nano-titanium dioxide, and 1 to 2 parts of sodium stearate are added to 5 to 8 parts of sodium dodecylbenzenesulfonate solution and mixed thoroughly to obtain a coupling liquid; The boron nitride of S01 and the coupling liquid are stirred thoroughly according to a weight ratio of 3:5, and then suction filtered and dried to obtain a functional coupling agent.

[0025] In this embodiment, the mass fraction of the sodium dodecylbenzenesulfonate solution is 5 to 8%.

[0026] The preparation method of an insulating powder coating for a new energy vehicle battery in this embodiment includes the following steps: Weigh the raw materials by weight parts, then mix the raw materials evenly to obtain a mixed material body. Feed the mixed material body into a twin-screw extruder for extrusion at an extrusion temperature of 110 °C. Then, press into tablets, cool, pulverize, and screen through 100 meshes to obtain an insulating powder coating.

[0027] Example 1. An insulating powder coating for a new energy vehicle battery in this example includes the following raw materials by weight parts: 20 parts of epoxy resin, 40 parts of fluorocarbon resin, 10 parts of polyester resin, 5 parts of modified filler, 4 parts of functional coupling agent, 2 parts of leveling agent, 3 parts of curing agent, and 2 parts of benzoin.

[0028] The epoxy resin in this example is epoxy resin E12, the hydroxyl value of the fluorocarbon resin is 44 mgKOH / g, and the polyester resin is a carboxyl polyester resin with an acid value of 35 mgKOH / g; The curing agent is dimethylimidazole; the leveling agent is BYK-368P.

[0029] The preparation method of the modified filler in this example is as follows: S01: Preparation of the first filler liquid: S01a: Blend nano-silica sol, sodium silicate solution, and carboxymethyl cellulose evenly according to a weight ratio of 2:5:1 to obtain a sodium silicate solution; S01b: Irradiate barium titanate in a proton irradiation chamber for 1 h with an irradiation power of 350 W. After irradiation, preheat the irradiated barium titanate at 55 °C for 1 h to obtain pretreated barium titanate; Add 4 parts of pretreated barium titanate to 5 parts of the sodium silicate solution and stir evenly to obtain the first filler liquid; S02: Blend 3 parts of polytetrafluoroethylene and 2 parts of cordierite and add them to 5 parts of a 5% hydrochloric acid dopamine solution and mix well to obtain a second filler liquid; Blend the first filler liquid and the second filler liquid according to a weight ratio of 5:4 and perform ultrasonic treatment to obtain a filler modification liquid; S03: Blend calcium zirconate additive and the filler modification liquid according to a weight ratio of 5:3, perform ball milling treatment at a ball milling speed of 1000 r / min for 2 h. After ball milling, filter and dry to obtain the modified filler.

[0030] The mass fraction of the sodium silicate solution in this example is 4%; the ultrasonic power for the blend ultrasonic treatment is 400 W and ultrasonic treatment is performed for 2 h.

[0031] The preparation method of the calcium zirconate additive in this example is as follows: Blend montmorillonite, manganese nitride, and sodium lignosulfonate solution evenly according to a weight ratio of 2:1:3 to obtain a montmorillonite solution; 4 parts of calcium zirconate, 2 parts of montmorillonite liquid and 1 part of urea are mixed and ball-milled at a speed of 1500 r / min for 2 hours. After the ball-milling is completed, the mixture is filtered and dried to obtain a calcium zirconate additive.

[0032] The mass fraction of the sodium lignin sulfonate solution in this embodiment is 5%.

[0033] The preparation method of the functional combination agent of this embodiment is: S01: Mix boron nitride with a sufficient amount of 5% potassium permanganate solution, then wash, filter and dry; S02: 3 parts of silicon carbide fiber, 2 parts of nano titanium dioxide, and 1 part of sodium stearate are added to 5 parts of sodium dodecylbenzene sulfonate solution and mixed thoroughly to obtain a crosslinking liquid; The boron nitride of S01 and the linking liquid are fully stirred in a weight ratio of 3:5, and then filtered and dried to obtain a functional combining agent.

[0034] The mass fraction of the sodium dodecylbenzenesulfonate solution of the present embodiment is 5%.

[0035] A method for preparing an insulating powder coating for a new energy vehicle battery in this embodiment comprises the following steps: The raw materials are weighed according to weight, and then mixed evenly to obtain a mixture, which is fed into a twin-screw extruder for extrusion at a temperature of 110° C., followed by tableting, cooling, crushing, and sieving through 100 meshes to obtain an insulating powder coating.

[0036] Example 2. The insulating powder coating for a new energy vehicle battery of this embodiment includes the following raw materials in parts by weight: 25 parts of epoxy resin, 45 parts of fluorocarbon resin, 15 parts of polyester resin, 8 parts of modified filler, 7 parts of functional combining agent, 3 parts of leveling agent, 5 parts of curing agent, and 4 parts of benzoin.

[0037] The epoxy resin in this embodiment is epoxy resin E12, the fluorocarbon resin has a hydroxyl value of 46 mgKOH / g, and the polyester resin is a carboxyl polyester resin with an acid value of 35 mgKOH / g; The curing agent is dimethylimidazole; the leveling agent is BYK-368P.

[0038] The preparation method of the modified filler of this embodiment is: S01: Preparation of the first filling liquid: S01a: Evenly blending nano silica sol, sodium silicate solution and carboxymethyl cellulose in a weight ratio of 3:7:1 to obtain sodium silicate solution; S01: Irradiate barium titanate in a proton irradiation chamber for 1 h at an irradiation power of 400 W. After irradiation, preheat the irradiated barium titanate at 60 °C for 1 h to obtain pretreated barium titanate; Add 7 parts of pretreated barium titanate to 8 parts of sodium silicate solution and stir evenly to obtain the first filler solution; S02: Blend 5 parts of polytetrafluoroethylene and 4 parts of cordierite and add them to 8 parts of a 5% hydrochloric acid dopamine solution by mass, and mix well to obtain the second filler solution; Blend the first filler solution and the second filler solution in a weight ratio of 7:4 and perform ultrasonic treatment to obtain a filler modification solution; S03: Blend calcium zirconate additive and the filler modification solution in a weight ratio of 6:3, perform ball milling treatment at a ball milling speed of 1500 r / min for 2 h. After ball milling, perform suction filtration and drying to obtain a modified filler agent.

[0039] In this example, the mass fraction of the sodium silicate solution is 6%; the ultrasonic power for the blending ultrasonic treatment is 500 W, and ultrasonic treatment is performed for 2 h.

[0040] The preparation method of the calcium zirconate additive in this example is as follows: Blend montmorillonite, manganese nitride and sodium lignosulfonate solution evenly in a weight ratio of 5:1:4 to obtain a montmorillonite solution; Blend 6 parts of calcium zirconate, 3 parts of the montmorillonite solution and 2 parts of urea, perform ball milling treatment at a ball milling speed of 1500 r / min for 2 h. After ball milling, perform suction filtration and drying to obtain a calcium zirconate additive.

[0041] In this example, the mass fraction of the sodium lignosulfonate solution is 8%.

[0042] The preparation method of the functional coupling agent in this example is as follows: S01: Mix boron nitride thoroughly in a sufficient amount of 5% potassium permanganate solution by mass, then wash with water, perform suction filtration and drying; S02: Add 5 parts of silicon carbide fiber, 3 parts of nano-titanium dioxide, and 2 parts of sodium stearate to 8 parts of sodium dodecylbenzenesulfonate solution and mix well to obtain a coupling solution; Stir the boron nitride in S01 and the coupling solution in a weight ratio of 3:5 thoroughly, then perform suction filtration and drying to obtain a functional coupling agent.

[0043] In this example, the mass fraction of the sodium dodecylbenzenesulfonate solution is 8%.

[0044] The preparation method of an insulating powder coating for a new energy vehicle battery in this example includes the following steps: Weigh the raw materials by weight parts, then mix the raw materials evenly to obtain a mixed material body. Feed the mixed material body into a twin-screw extruder for extrusion at an extrusion temperature of 110 °C. Then, press into tablets, cool, pulverize, and screen through 100 meshes to obtain an insulating powder coating.

[0045] Example 3. An insulating powder coating for a new energy vehicle battery in this example includes the following raw materials by weight parts: 22.5 parts of epoxy resin, 42.5 parts of fluorocarbon resin, 12.5 parts of polyester resin, 6.5 parts of modified filler, 5.5 parts of functional coupling agent, 2.5 parts of leveling agent, 4 parts of curing agent, and 3 parts of benzoin.

[0046] The epoxy resin in this example is epoxy resin E12, the hydroxyl value of the fluorocarbon resin is 45 mgKOH / g, and the polyester resin is a carboxyl polyester resin with an acid value of 35 mgKOH / g; The curing agent is dimethylimidazole; the leveling agent is BYK-368P.

[0047] The preparation method of the modified filler in this example is as follows: S01: Preparation of the first filler liquid: S01a: Blend 2.5:6:1 of nano-silica sol, sodium silicate solution, and carboxymethyl cellulose by weight to obtain a sodium silicate solution; S01b: Irradiate barium titanate in a proton irradiation chamber for 1 h with an irradiation power of 375 W. After irradiation, preheat the irradiated barium titanate at 57.5 °C for 1 h to obtain pretreated barium titanate; Add 5.5 parts of pretreated barium titanate to 6.5 parts of the sodium silicate solution and stir evenly to obtain the first filler liquid; S02: Blend 4 parts of polytetrafluoroethylene and 3 parts of cordierite and add them to 6.5 parts of a 5% hydrochloric acid dopamine solution and mix well to obtain the second filler liquid; Blend the first filler liquid and the second filler liquid by weight ratio of 6:4 and perform ultrasonic treatment to obtain a filler modification liquid; S03: Blend calcium zirconate additive and the filler modification liquid by weight ratio of 5.5:3, perform ball milling treatment at a ball milling speed of 1250 r / min for 2 h. After ball milling, filter and dry to obtain the modified filler.

[0048] The mass fraction of the sodium silicate solution in this example is 5%; the ultrasonic power of the blend ultrasonic treatment is 450 W and ultrasonic treatment is performed for 2 h.

[0049] The preparation method of the calcium zirconate additive in this example is as follows: Blend montmorillonite, manganese nitride, and sodium lignosulfonate solution by weight ratio of 3.5:1:3.5 to obtain a montmorillonite solution; 5 parts of calcium zirconate, 2.5 parts of montmorillonite liquid, and 1.5 parts of urea were mixed and ball-milled. The ball-milling speed was 1500 r / min, and the ball-milling time was 2 h. After the ball-milling was completed, suction filtration and drying were carried out to obtain a calcium zirconate additive.

[0050] In this example, the mass fraction of the sodium lignosulfonate solution was 6.5%.

[0051] The preparation method of the functional combination agent in this example was as follows: S01: Boron nitride was thoroughly mixed in a sufficient amount of a 5% potassium permanganate solution, and then washed with water, suction-filtered, and dried; S02: 4 parts of silicon carbide fiber, 2.5 parts of nano-titanium dioxide, and 1.5 parts of sodium stearate were added to 6.5 parts of a sodium dodecylbenzenesulfonate solution and mixed thoroughly to obtain a combined liquid; The boron nitride of S01 and the combined liquid were stirred thoroughly according to a weight ratio of 3:5, and then suction-filtered and dried to obtain a functional combination agent.

[0052] In this example, the mass fraction of the sodium dodecylbenzenesulfonate solution was 6.5%.

[0053] The preparation method of an insulating powder coating for a new energy vehicle battery in this example included the following steps: The raw materials were weighed according to parts by weight, and then the raw materials were mixed evenly to obtain a mixed material body. The mixed material body was fed into a twin-screw extruder for extrusion. The extrusion temperature was 110 °C, and then it was pressed into tablets, cooled, crushed, and screened through 100 meshes to obtain an insulating powder coating.

[0054] Comparative example 1. The difference from Example 3 was that no modified filler was added.

[0055] Comparative example 2. The difference from Example 3 was that no filler modification liquid was added to the modified filler.

[0056] Comparative example 3. The difference from Example 3 was that no first filler liquid was added to the filler modification liquid.

[0057] Comparative example 4. The difference from Example 3 was that no pretreated barium titanate was added to the first filler liquid.

[0058] Comparative example 5. The difference from Example 3 was that no sodium silicate solution was added to the first filler liquid.

[0059] Comparative example 6. The difference from Example 3 was that no second filler liquid was added to the filler modification liquid.

[0060] Comparative example 7. Different from Example 3, polytetrafluoroethylene and cordierite were not added to the second filler liquid.

[0061] Comparative Example 8. Different from Example 3, calcium zirconate additive was not added to the modified filler.

[0062] Comparative Example 9. Different from Example 3, the functional coupling agent was not added.

[0063] Comparative Example 10. Different from Example 3, boron nitride of S01 was not added to the functional coupling agent.

[0064] Comparative Example 11. Different from Example 3, the coupling liquid was not added to the functional coupling agent.

[0065] Comparative Example 12. Different from Example 3, silicon carbide fibers and nano-titanium dioxide were not added to the coupling liquid.

[0066] For routine tests, the products of Examples 1 - 3 and Comparative Examples 1 - 12 were sprayed onto the substrate with a spraying thickness of 0.5 mm, and then the breakdown strength (tested according to the standard of GB / T6554 - 2003), abrasion resistance (tested according to the standard of GB / T1768 - 2006), and impact resistance (tested according to the standard of GB / T1732 - 2020) were measured, and the electrolyte resistance and heat stability of the products were also tested (the product was placed at 70 °C for 12 h and then placed in the electrolyte for 12 h, and the above was taken as one cycle, and the cycle was repeated 10 times. The electrolyte composition was: 1 mol / L LiPF 6 in a solution of ethylene carbonate and dimethyl carbonate, and the volume ratio of the solvent ethylene carbonate and dimethyl carbonate was 1:1);

[0067] It can be seen from Comparative Examples 1 - 12 and Examples 1 - 3 that; The product of Example 3 has excellent breakdown strength, abrasion resistance and impact resistance, and at the same time, the product has excellent electrolyte resistance and heat stability; It can be seen from Comparative Examples 1 - 12 and Example 3 that when one of the modified filler or the functional coupling agent is not added to the product, the performance of the product deteriorates significantly. By using the synergistic combination of the two, the performance effect of the product is the most significant; When the filler modification liquid is not added to the modified filler, the first filler liquid is not added to the filler modification liquid, the pretreated barium titanate is not added to the first filler liquid, the sodium silicate solution is not added to the first filler liquid, the second filler liquid is not added to the filler modification liquid, polytetrafluoroethylene and cordierite are not added to the second filler liquid, and calcium zirconate additive is not added to the modified filler, the performance of the product shows a trend of deterioration to varying degrees; Meanwhile, without adding calcium zirconate additive, the performance of the product deteriorates significantly. Moreover, for the filler modification liquid prepared by combining the first filler liquid and the second filler liquid obtained by the specific method of the present invention, the performance effect of the product is the most remarkable; When boron nitride without S01 is not added to the functional coupling agent, the coupling liquid is not added to the functional coupling agent, silicon carbide fiber and nano-titanium dioxide are not added to the coupling liquid, the performance of the product shows a deteriorating trend to varying degrees. Only the functional coupling agent prepared by combining the coupling liquid obtained by the method of the present invention with boron nitride of S01 has the most remarkable performance effect on the product.

[0068] Based on the fact that calcium zirconate additive has a great influence on the performance of the product, further research is carried out as follows: The preparation method of calcium zirconate additive is as follows: Montmorillonite, manganese nitride and sodium lignosulfonate solution are blended evenly according to the weight ratio of 3.5:1:3.5 to obtain montmorillonite liquid; 5 parts of calcium zirconate, 2.5 parts of montmorillonite liquid and 1.5 parts of urea are blended and ball-milled. The ball-milling speed is 1500 r / min, and the ball-milling time is 2 h. After the ball-milling is completed, filtration and drying are carried out to obtain calcium zirconate additive.

[0069] The mass fraction of the sodium lignosulfonate solution in this example is 6.5%.

[0070] Experimental Example 1. The only difference from Example 3 is that calcium zirconate is not added to the calcium zirconate additive.

[0071] Experimental Example 2. The only difference from Example 3 is that montmorillonite is not added to the calcium zirconate additive.

[0072] Experimental Example 3. The only difference from Example 3 is that manganese nitride is not added to the calcium zirconate additive.

[0073] Experimental Example 4. The only difference from Example 3 is that urea is not added to the calcium zirconate additive, and water is used instead of the sodium lignosulfonate solution.

[0074] Based on the above tests, the performance of Experimental Examples 1-4 is continuously tested:

[0075] As can be seen from Experimental Examples 1-4, when calcium zirconate is not added to the calcium zirconate additive, the change trend of the product performance is relatively large. At the same time, when montmorillonite is not added to the calcium zirconate additive, manganese nitride is not added to the calcium zirconate additive, urea is not added to the calcium zirconate additive, and water is used instead of the sodium lignosulfonate solution, the performance of the product shows a deteriorating trend to varying degrees. The performance effect of the product with the calcium zirconate additive obtained by the specific method of the present invention is the most significant, and the effect of using other methods instead is not as obvious as that of the present invention.

[0076] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention.

[0077] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An insulating powder coating for new energy vehicle batteries, characterized in that: It includes the following raw materials in parts by weight: 20-25 parts of epoxy resin, 40-45 parts of fluorocarbon resin, 10-15 parts of polyester resin, 5-8 parts of modified filler, 4-7 parts of functional combination agent, 2-3 parts of leveling agent, 3-5 parts of curing agent, 2-4 parts of benzoin; The preparation method of the modified filler is: Firstly, the first filler liquid and the second filler liquid are mixed and ultrasonically treated to obtain a filler modified liquid, and then the calcium zirconate additive and the filler modified liquid are mixed and ball-milled to obtain a modified filler agent; The preparation method of the functional combination agent is: Silicon carbide fiber, nano titanium dioxide and sodium stearate are added to sodium dodecylbenzene sulfonate solution and mixed fully to obtain a linking liquid, and then boron nitride and the linking liquid are stirred fully, and then filtered and dried to obtain a functional combining agent.

2. The insulating powder coating for new energy vehicle batteries according to claim 1, characterized in that: The insulating powder coating comprises the following raw materials in parts by weight: 22.5 parts of epoxy resin, 42.5 parts of fluorocarbon resin, 12.5 parts of polyester resin, 6.5 parts of modified filler, 5.5 parts of functional combining agent, 2.5 parts of leveling agent, 4 parts of curing agent, and 3 parts of benzoin.

3. The insulating powder coating for new energy vehicle batteries according to claim 1, characterized in that: The epoxy resin is epoxy resin E12, the fluorocarbon resin has a hydroxyl value of 44-46 mgKOH / g, and the polyester resin is a carboxyl polyester resin with an acid value of 35 mgKOH / g; The curing agent is dimethylimidazole; the leveling agent is BYK-368P.

4. The insulating powder coating for new energy vehicle batteries according to claim 1, characterized in that: The specific preparation method of the modified filler is: S01: Preparation of the first filling liquid: S01a: Mix nano silica sol, sodium silicate solution and carboxymethyl cellulose in a weight ratio of (2-3): (5-7): 1 to obtain sodium silicate solution; S01b: irradiating barium titanate in a proton irradiation box for 1 hour at an irradiation power of 350-400W. After the irradiation, preheating the irradiated barium titanate at 55-60°C for 1 hour to obtain pretreated barium titanate; 4-7 parts of pretreated barium titanate are added to 5-8 parts of sodium silicate solution and stirred evenly to obtain a first filler solution; S02: 3-5 parts of polytetrafluoroethylene and 2-4 parts of cordierite are mixed into 5-8 parts of 5% by mass dopamine hydrochloride solution and mixed thoroughly to obtain a second filler liquid; The first filler liquid and the second filler liquid are mixed and ultrasonically treated in a weight ratio of (5-7):4 to obtain a filler modified liquid; S03: Mix the calcium zirconate additive and the filler modification liquid in a weight ratio of (5-6):3 and perform ball milling at a ball milling speed of 1000-1500 r / min for 2 h. After the ball milling is completed, filter and dry to obtain a modified filler.

5. The insulating powder coating for new energy vehicle batteries according to claim 4, characterized in that: The mass fraction of the sodium silicate solution is 4-6%; the ultrasonic power of the blending ultrasonic treatment is 400-500W, and the ultrasonic treatment is performed for 2 hours.

6. The insulating powder coating for new energy vehicle batteries according to claim 4, characterized in that: The preparation method of the calcium zirconate additive is: The montmorillonite, manganese nitride and sodium lignin sulfonate solution are uniformly mixed in a weight ratio of (2-5):1:(3-4) to obtain a montmorillonite solution; 4-6 parts of calcium zirconate, 2-3 parts of montmorillonite liquid and 1-2 parts of urea are mixed and ball-milled at a speed of 1500 r / min for 2 hours. After the ball milling is completed, the mixture is filtered and dried to obtain a calcium zirconate additive.

7. The insulating powder coating for new energy vehicle batteries according to claim 6, characterized in that: The mass fraction of the sodium lignin sulfonate solution is 5-8%.

8. The insulating powder coating for new energy vehicle batteries according to claim 1, characterized in that: The specific preparation method of the functional combination agent is: S01: Mix boron nitride with a sufficient amount of 5% potassium permanganate solution, then wash, filter and dry; S02: 3-5 parts of silicon carbide fiber, 2-3 parts of nano titanium dioxide, and 1-2 parts of sodium stearate are added to 5-8 parts of sodium dodecylbenzene sulfonate solution and mixed thoroughly to obtain a crosslinking liquid; The boron nitride of S01 and the linking liquid are fully stirred in a weight ratio of 3:5, and then filtered and dried to obtain a functional combining agent.

9. The insulating powder coating for new energy vehicle batteries according to claim 8, characterized in that: The mass fraction of the sodium dodecylbenzene sulfonate solution is 5-8%.

10. A method for preparing an insulating powder coating for a new energy vehicle battery according to any one of claims 1 to 9, characterized in that: The following steps are involved: The raw materials are weighed according to weight, and then mixed evenly to obtain a mixture, which is fed into a twin-screw extruder for extrusion at a temperature of 110° C., followed by tableting, cooling, crushing, and sieving through 100 meshes to obtain an insulating powder coating.

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