An insulating powder coating for new energy vehicle batteries and its preparation method

Abstract

The present invention relates to the technical field of powder coatings, and specifically relates to an insulating powder coating for new energy vehicle batteries and a preparation method thereof, which 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 modified filler, 4-7 parts of functional coupling agent, 2-3 parts of leveling agent, 3-5 parts of curing agent, and 2-4 parts of benzoin. The insulating powder coating of the present invention uses epoxy resin in combination with fluorocarbon resin and polyester resin, and at the same time adds leveling agent, curing agent, and benzoin as functional auxiliaries, as well as the added modified filler and functional coupling agent are mutually adjusted, so that the breakdown strength, wear resistance and impact resistance of the obtained product are coordinately improved, and the product has remarkable effects of resistance to electrolyte and heat stability.

Description

Technical Field

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

[0002] Powder coatings are solid powder synthetic resin coatings composed of solid resins, pigments, fillers, and additives. Different from 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 major categories: thermoplastic and thermosetting.

[0003] The existing powder coatings are applied to automotive batteries, with poor breakdown strength performance of the products. At the same time, the wear resistance and impact resistance of the products are poor. It is difficult for the products to achieve coordinated improvement of breakdown strength, wear resistance, and impact resistance, and the products have poor electrolyte resistance and heat stability, which limits the use efficiency of the products. Summary of the Invention

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

[0005] The present invention adopts the following technical solutions to solve the technical problems:

[0006] The present invention provides an insulating powder coating for new energy vehicle batteries, comprising the following raw materials in parts by weight:

[0007] 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 coupling agent, 2 - 3 parts of leveling agent, 3 - 5 parts of curing agent, 2 - 4 parts of benzoin;

[0008] The preparation method of the modified filler is as follows:

[0009] First, the first filler liquid and the second filler liquid are blended 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 prepare the modified filler.

[0010] The preparation method of the functional coupling agent is as follows:

[0011] Silicon carbide fibers, nano-titanium dioxide, and sodium stearate are added to the sodium dodecylbenzenesulfonate solution and blended sufficiently to obtain a coupling liquid, and then boron nitride and the coupling liquid are stirred sufficiently, and then filtered and dried to obtain the functional coupling agent.

[0012] Preferably, the insulating powder coating comprises the following raw materials in parts by weight:

[0013] 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, 3 parts of benzoin.

[0014] 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;

[0015] The curing agent is dimethylimidazole; the leveling agent is BYK - 368P.

[0016] Preferably, the preparation method of the modified filler is as follows:

[0017] S01: Preparation of the first filler liquid:

[0018] 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 sodium silicate liquid;

[0019] S01b: Irradiate barium titanate in a proton irradiation box for 1 h with an irradiation power of 350 - 400 W. After irradiation, pre - heat the irradiated barium titanate at 55 - 60 °C for 1 h to obtain pretreated barium titanate;

[0020] Add 4 - 7 parts of pretreated barium titanate to 5 - 8 parts of sodium silicate liquid and stir evenly to obtain the first filler liquid;

[0021] S02: Mix 3 - 5 parts of polytetrafluoroethylene and 2 - 4 parts of cordierite and add them to 5 - 8 parts of 5% hydrochloric acid dopamine solution and mix well to obtain the second filler liquid;

[0022] 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 the filler modification liquid;

[0023] S03: Mix calcium zirconate additive and 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.

[0024] Preferably, the mass fraction of the sodium silicate solution is 4 - 6%; the ultrasonic power of the co - mixing ultrasonic treatment is 400 - 500 W and the ultrasonic treatment is performed for 2 h.

[0025] Preferably, the preparation method of the calcium zirconate additive is as follows:

[0026] Mix montmorillonite, manganese nitride and sodium lignosulfonate solution evenly according to the weight ratio of (2 - 5):1:(3 - 4) to obtain montmorillonite liquid;

[0027] 4 to 6 parts of calcium zirconate, 2 to 3 parts of montmorillonite liquid, and 1 to 2 parts of urea are mixed and ball-milled. The ball-milling speed is 1500 r / min, and the ball-milling is carried out for 2 h. After the ball-milling is completed, filtration and drying are carried out to obtain the calcium zirconate additive.

[0028] Preferably, the mass fraction of the sodium lignosulfonate solution is 5 to 8%.

[0029] Preferably, the preparation method of the functional coupling agent is as follows:

[0030] S01: Boron nitride is mixed thoroughly in a sufficient amount of a 5% potassium permanganate solution, and then washed with water, filtered, and dried;

[0031] S02: 3 to 5 parts of silicon carbide fibers, 2 to 3 parts of nano-titanium dioxide, and 1 to 2 parts of sodium stearate are added to 5 to 8 parts of a sodium dodecylbenzenesulfonate solution and mixed thoroughly to obtain a coupling liquid;

[0032] The boron nitride of S01 and the coupling liquid are stirred thoroughly according to a weight ratio of 3:5, and then filtered and dried to obtain the functional coupling agent.

[0033] Preferably, the mass fraction of the sodium dodecylbenzenesulfonate solution is 5 to 8%.

[0034] The present invention also provides a preparation method of an insulating powder coating for a new energy vehicle battery, including the following steps:

[0035] Weigh the raw materials according to parts by weight, and then mix the raw materials evenly to obtain a mixed material body. The mixed material body is fed into a twin-screw extruder for extrusion. The extrusion temperature is 110 °C, and then it is pressed into tablets, cooled, crushed, and sieved through 100 meshes to obtain the insulating powder coating.

[0036] Compared with the prior art, the present invention has the following beneficial effects:

[0037] The insulating powder coating of the present invention uses epoxy resin in combination with fluorocarbon resin and polyester resin. At the same time, the leveling agent, curing agent, and benzoin added as functional additives, and the modified filler and functional coupling agent added are mutually adjusted. The breakdown strength, wear resistance, and impact resistance of the obtained product are coordinately improved, and the product has remarkable effects of resistance to electrolyte and heat stability;

[0038] The modified filler is prepared by improving the treatment with a calcium zirconate additive in combination with a filler modification liquid through ball milling. The first filler liquid and the second filler liquid in the filler modification liquid are blended and ultrasonically treated. The barium titanate in the first filler liquid is optimized by proton irradiation to stimulate the activity efficiency, and then it is improved by blending with a sodium silicate solution. The nano-silica sol, sodium silicate solution, and carboxymethyl cellulose in the sodium silicate solution are blended and coordinated to prepare the first filler liquid through the coordination and optimization of raw materials. At the same time, polytetrafluoroethylene and cordierite in the second filler liquid are blended with a dopamine hydrochloride solution with a mass fraction of 5%, and the first filler liquid is coordinated through the coordination of raw materials to prepare the filler modification liquid, which improves the calcium zirconate additive. The calcium zirconate additive is prepared by blending and ball milling calcium zirconate, montmorillonite liquid, and urea. The montmorillonite, manganese nitride, and sodium lignosulfonate solution in the montmorillonite liquid are coordinated and optimized into the system. The lamellar montmorillonite coordinates manganese nitride and calcium zirconate to coordinate the modified filler, and further optimize the performance effect of the product in the system;

[0039] The boron nitride in the functional coupling agent is optimized and improved by a potassium permanganate solution to improve its activity efficiency. At the same time, it is improved and optimized in combination with a coupling liquid. The silicon carbide fiber, nano-titanium dioxide, and other raw materials are formulated with sodium stearate in the coupling liquid. The fiber structure of the silicon carbide fiber is combined with other raw materials such as nano-titanium dioxide to strengthen the system structure, so that the obtained functional coupling agent has a better coordination effect with the modified filler, and the performance of the product is further improved. Specific embodiments

[0040] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to specific embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0041] An insulating powder coating for a new energy vehicle battery in this embodiment includes the following raw materials in parts by weight:

[0042] 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 coupling agent, 2 - 3 parts of leveling agent, 3 - 5 parts of curing agent, 2 - 4 parts of benzoin;

[0043] The preparation method of the modified filler is as follows:

[0044] First, the first filler liquid and the second filler liquid are blended and ultrasonically treated to obtain a filler modification liquid, and then the calcium zirconate additive and the filler modification liquid are mixed and ball milled to prepare a modified filler;

[0045] The preparation method of the functional coupling agent is as follows:

[0046] Mix silicon carbide fibers, nano-titanium dioxide, and sodium stearate thoroughly in a sodium dodecylbenzenesulfonate solution to obtain a coupling liquid. Then, stir boron nitride and the coupling liquid thoroughly, followed by suction filtration and drying to obtain a functional coupling agent.

[0047] The insulating powder coating of this example includes the following raw materials in parts by weight:

[0048] 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.

[0049] The epoxy resin in this example 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;

[0050] The curing agent is dimethylimidazole; the leveling agent is BYK - 368P.

[0051] The preparation method of the modified filler in this example is as follows:

[0052] S01: Preparation of the first filler liquid:

[0053] 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;

[0054] S01b: Irradiate barium titanate in a proton irradiation chamber 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;

[0055] 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;

[0056] S02: Mix 3 - 5 parts of polytetrafluoroethylene and 2 - 4 parts of cordierite and add them to 5 - 8 parts of a 5% hydrochloric acid dopamine solution and mix thoroughly to obtain the second filler liquid;

[0057] 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 modified liquid;

[0058] S03: Mix calcium zirconate additive and the filler modified 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.

[0059] The mass fraction of the sodium silicate solution in this example is 4 - 6%; the ultrasonic power for the blending ultrasonic treatment is 400 - 500 W, and ultrasonic treatment is carried out for 2 h.

[0060] The preparation method of the calcium zirconate additive in this example is as follows:

[0061] Montmorillonite, manganese nitride and sodium lignosulfonate solution are blended evenly according to the weight ratio of (2 - 5):1:(3 - 4) to obtain a montmorillonite solution;

[0062] 4 - 6 parts of calcium zirconate, 2 - 3 parts of the montmorillonite solution and 1 - 2 parts of urea are blended and ball - milled. The ball - mill rotation speed is 1500 r / min, and ball - milling is carried out for 2 h. After ball - milling, suction filtration and drying are carried out to obtain the calcium zirconate additive.

[0063] The mass fraction of the sodium lignosulfonate solution in this example is 5 - 8%.

[0064] The preparation method of the functional coupling agent in this example is as follows:

[0065] S01: Boron nitride is mixed thoroughly in a sufficient amount of 5% potassium permanganate solution, then washed with water, suction - filtered and dried;

[0066] 3 - 5 parts of silicon carbide fibers, 2 - 3 parts of nano - titanium dioxide, 1 - 2 parts of sodium stearate are added to 5 - 8 parts of sodium dodecylbenzenesulfonate solution and blended thoroughly to obtain a coupling liquid;

[0067] The boron nitride of S01 and the coupling liquid are stirred thoroughly according to the weight ratio of 3:5, then suction - filtered and dried to obtain the functional coupling agent.

[0068] The mass fraction of the sodium dodecylbenzenesulfonate solution in this example is 5 - 8%.

[0069] The preparation method of an insulating powder coating for a new - energy vehicle battery in this example includes the following steps:

[0070] Weigh the raw materials according to weight parts, then mix the raw materials evenly to obtain a mixed material body. The mixed material body is sent into a twin - screw extruder for extrusion. The extrusion temperature is 110 °C, and then tableted, cooled, pulverized, and screened through 100 - mesh to obtain the insulating powder coating.

[0071] Example 1.

[0072] An insulating powder coating for a new - energy vehicle battery in this example includes the following raw materials in weight parts:

[0073] 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, 2 parts of benzoin.

[0074] The epoxy resin in this embodiment 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;

[0075] The curing agent is dimethylimidazole; the leveling agent is BYK-368P.

[0076] The preparation method of the modified filler in this embodiment is as follows:

[0077] S01: Preparation of the first filler liquid:

[0078] S01a: Blend nano-silica sol, sodium silicate solution and carboxymethyl cellulose evenly according to the weight ratio of 2:5:1 to obtain a sodium silicate solution;

[0079] 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;

[0080] Add 4 parts of pretreated barium titanate to 5 parts of the sodium silicate solution and stir evenly to obtain the first filler liquid;

[0081] 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 the second filler liquid;

[0082] Blend the first filler liquid and the second filler liquid according to the weight ratio of 5:4 and perform ultrasonic treatment to obtain a filler modification liquid;

[0083] S03: Blend the calcium zirconate additive and the filler modification liquid according to the weight ratio of 5:3, perform ball milling treatment at a ball milling speed of 1000 r / min for 2 h. After ball milling, perform suction filtration and drying to obtain the modified filler.

[0084] The mass fraction of the sodium silicate solution in this embodiment is 4%; the ultrasonic power of the blending ultrasonic treatment is 400 W, and the ultrasonic treatment is performed for 2 h.

[0085] The preparation method of the calcium zirconate additive in this embodiment is as follows:

[0086] Blend montmorillonite, manganese nitride and sodium lignosulfonate solution evenly according to the weight ratio of 2:1:3 to obtain a montmorillonite solution;

[0087] Blend 4 parts of calcium zirconate, 2 parts of the montmorillonite solution and 1 part 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.

[0088] The mass fraction of the sodium lignosulfonate solution in this embodiment is 5%.

[0089] The preparation method of the functional combination agent of this embodiment is:

[0090] S01: Mix boron nitride with a sufficient amount of 5% potassium permanganate solution, then wash with water, filter and dry;

[0091] 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 blended thoroughly to obtain a crosslinking liquid;

[0092] The boron nitride of S01 and the linking liquid were stirred thoroughly in a weight ratio of 3:5, and then filtered and dried to obtain a functional combining agent.

[0093] The mass fraction of the sodium dodecylbenzenesulfonate solution in this embodiment is 5%.

[0094] The method for preparing an insulating powder coating for a new energy vehicle battery of this embodiment comprises the following steps:

[0095] The raw materials are weighed according to parts by weight, and then mixed uniformly 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.

[0096] Example 2.

[0097] The insulating powder coating for a new energy vehicle battery of this embodiment includes the following raw materials in parts by weight:

[0098] 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.

[0099] 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;

[0100] The curing agent is dimethylimidazole; the leveling agent is BYK-368P.

[0101] The preparation method of the modified filler of this embodiment is:

[0102] S01: Preparation of the first filling liquid:

[0103] S01a: Nano-silica sol, sodium silicate solution and carboxymethyl cellulose are uniformly blended in a weight ratio of 3:7:1 to obtain sodium silicate solution;

[0104] 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;

[0105] Add 7 parts of pretreated barium titanate to 8 parts of sodium silicate solution and stir evenly to obtain the first filler solution;

[0106] S02: Blend 5 parts of polytetrafluoroethylene and 4 parts of cordierite and add them to 8 parts of a 5% hydrochloric acid dopamine solution, mix well to obtain the second filler solution;

[0107] Blend the first filler solution and the second filler solution according to a weight ratio of 7:4 and perform ultrasonic treatment to obtain a filler modification solution;

[0108] S03: Blend calcium zirconate additive and the filler modification solution according to a weight ratio of 6:3, perform ball milling 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.

[0109] In this example, the mass fraction of the sodium silicate solution is 6%; the ultrasonic power of the blend ultrasonic treatment is 500 W, and ultrasonic treatment is performed for 2 h.

[0110] The preparation method of the calcium zirconate additive in this example is as follows:

[0111] Blend montmorillonite, manganese nitride and sodium lignosulfonate solution according to a weight ratio of 5:1:4 and mix evenly to obtain a montmorillonite solution;

[0112] Blend 6 parts of calcium zirconate, 3 parts of the montmorillonite solution and 2 parts of urea, perform ball milling 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.

[0113] In this example, the mass fraction of the sodium lignosulfonate solution is 8%.

[0114] The preparation method of the functional coupling agent in this example is as follows:

[0115] S01: Mix boron nitride thoroughly in a sufficient amount of 5% potassium permanganate solution, then wash with water, perform suction filtration and drying;

[0116] S02: Add 5 parts of silicon carbide fiber, 3 parts of nano-titanium dioxide, 2 parts of sodium stearate to 8 parts of sodium dodecylbenzenesulfonate solution and mix thoroughly to obtain a coupling solution;

[0117] Stir the boron nitride obtained in S01 and the coupling solution according to a weight ratio of 3:5 thoroughly, then perform suction filtration and drying to obtain a functional coupling agent.

[0118] In this example, the mass fraction of the sodium dodecylbenzenesulfonate solution is 8%.

[0119] A preparation method of an insulating powder coating for a new energy vehicle battery in this embodiment includes the following steps:

[0120] Weigh the raw materials according to parts by weight, then mix the raw materials evenly to obtain a mixed material body, send the mixed material body into a twin-screw extruder for extrusion, the extrusion temperature is 110 °C, then press into tablets, cool, crush, and sieve through 100 meshes to obtain the insulating powder coating.

[0121] Example 3.

[0122] An insulating powder coating for a new energy vehicle battery in this embodiment includes the following raw materials in parts by weight:

[0123] 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.

[0124] The epoxy resin in this embodiment 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;

[0125] The curing agent is dimethylimidazole; the leveling agent is BYK-368P.

[0126] The preparation method of the modified filler in this embodiment is:

[0127] S01: Preparation of the first filler liquid:

[0128] S01a: Mix nano-silica sol, sodium silicate solution, and carboxymethyl cellulose evenly according to the weight ratio of 2.5:6:1 to obtain a sodium silicate solution;

[0129] S01b: Irradiate barium titanate in a proton irradiation chamber for 1 h, the irradiation power is 375 W, after the irradiation ends, preheat the irradiated barium titanate at 57.5 °C for 1 h to obtain pretreated barium titanate;

[0130] 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;

[0131] S02: Add 4 parts of polytetrafluoroethylene and 3 parts of cordierite to 6.5 parts of a 5% hydrochloric acid dopamine solution and mix evenly to obtain the second filler liquid;

[0132] Mix the first filler liquid and the second filler liquid according to the weight ratio of 6:4 and perform ultrasonic treatment to obtain a filler modified liquid;

[0133] S03: Mix calcium zirconate additive and filler modification liquid according to a weight ratio of 5.5:3, and conduct ball milling treatment. The ball milling speed is 1250 r / min, and ball milling lasts for 2 h. After ball milling is completed, perform suction filtration and drying to obtain the modified filler agent.

[0134] In this example, the mass fraction of the sodium silicate solution is 5%; the ultrasonic power for the co - blending ultrasonic treatment is 450 W, and ultrasonic treatment lasts for 2 h.

[0135] The preparation method of the calcium zirconate additive in this example is as follows:

[0136] Mix montmorillonite, manganese nitride, and sodium lignosulfonate solution evenly according to a weight ratio of 3.5:1:3.5 to obtain montmorillonite liquid;

[0137] Mix 5 parts of calcium zirconate, 2.5 parts of montmorillonite liquid, and 1.5 parts of urea, and conduct ball milling treatment. The ball milling speed is 1500 r / min, and ball milling lasts for 2 h. After ball milling is completed, perform suction filtration and drying to obtain the calcium zirconate additive.

[0138] In this example, the mass fraction of the sodium lignosulfonate solution is 6.5%.

[0139] The preparation method of the functional coupling agent in this example is as follows:

[0140] S01: Mix boron nitride sufficiently in a sufficient amount of potassium permanganate solution with a mass fraction of 5%, then wash with water, perform suction filtration, and dry;

[0141] Add 4 parts of silicon carbide fiber, 2.5 parts of nano - titanium dioxide, and 1.5 parts of sodium stearate to 6.5 parts of sodium dodecylbenzenesulfonate solution and mix thoroughly to obtain a coupling liquid;

[0142] Stir the boron nitride from S01 and the coupling liquid sufficiently according to a weight ratio of 3:5, then perform suction filtration and drying to obtain the functional coupling agent.

[0143] In this example, the mass fraction of the sodium dodecylbenzenesulfonate solution is 6.5%.

[0144] The preparation method of an insulating powder coating for a new - energy vehicle battery in this example includes the following steps:

[0145] Weigh the raw materials by weight, then mix the raw materials evenly to obtain a mixed material body. Feed the mixed material body into a twin - screw extruder for extrusion. The extrusion temperature is 110 °C, then press into tablets, cool, crush, and sieve through 100 meshes to obtain the insulating powder coating.

[0146] Comparative Example 1.

[0147] It is different from Example 3 in that the modified filler agent is not added.

[0148] Comparative Example 2.

[0149] It is different from Example 3 in that the filler modifier does not contain the filler modification liquid.

[0150] Comparative Example 3.

[0151] It is different from Example 3 in that the first filler liquid is not added to the filler modification liquid.

[0152] Comparative Example 4.

[0153] It is different from Example 3 in that the pretreated barium titanate is not added to the first filler liquid.

[0154] Comparative Example 5.

[0155] It is different from Example 3 in that the sodium silicate solution is not added to the first filler liquid.

[0156] Comparative Example 6.

[0157] It is different from Example 3 in that the second filler liquid is not added to the filler modification liquid.

[0158] Comparative Example 7.

[0159] It is different from Example 3 in that polytetrafluoroethylene and cordierite are not added to the second filler liquid.

[0160] Comparative Example 8.

[0161] It is different from Example 3 in that the calcium zirconate additive is not added to the filler modifier.

[0162] Comparative Example 9.

[0163] It is different from Example 3 in that the functional combination agent is not added.

[0164] Comparative Example 10.

[0165] It is different from Example 3 in that boron nitride of S01 is not added to the functional combination agent.

[0166] Comparative Example 11.

[0167] It is different from Example 3 in that the coupling liquid is not added to the functional combination agent.

[0168] Comparative Example 12.

[0169] It is different from Example 3 in that silicon carbide fibers and nano titanium dioxide are not added to the coupling liquid.

[0170] For the conventional tests, the products of Examples 1 to 3 and Comparative Examples 1 to 12 were sprayed onto the substrates 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. The above was one cycle, and the cycle was repeated 10 times. The electrolyte composition was: a solution of ethylene carbonate and dimethyl carbonate with 1 mol / L of LiPF6, and the volume ratio of the solvent ethylene carbonate to dimethyl carbonate was 1:1);

[0171]

[0172] It can be seen from Comparative Examples 1 to 12 and Examples 1 to 3;

[0173] 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;

[0174] It can be seen from Comparative Examples 1 to 12 and Example 3 that when one of the modified filler agent and the functional coupling agent is not added to the product, the performance of the product deteriorates significantly. When the two are used in coordination, the performance effect of the product is the most significant;

[0175] When the filler modification liquid is not added to the modified filler agent, 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, the polytetrafluoroethylene and cordierite are not added to the second filler liquid, and the calcium zirconate additive is not added to the modified filler agent, the performance of the product shows a deteriorating trend to varying degrees;

[0176] At the same time, when the calcium zirconate additive is not added, the performance of the product deteriorates more significantly, and when the filler modification liquid is prepared by mixing 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 significant;

[0177] When boron nitride of 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 when the coupling liquid obtained by the method of the present invention is used in combination with boron nitride of S01 to form the functional coupling agent, the performance effect of the product is the most significant.

[0178] Based on the fact that the calcium zirconate additive has a great influence on the performance of the product, further research was carried out on this:

[0179] The preparation method of the calcium zirconate additive is:

[0180] Mix montmorillonite, manganese nitride, and sodium lignosulfonate solution evenly according to a weight ratio of 3.5:1:3.5 to obtain a montmorillonite solution;

[0181] Mix 5 parts of calcium zirconate, 2.5 parts of the montmorillonite solution, and 1.5 parts of urea, and perform ball milling treatment. The ball milling speed is 1500 r / min, and the ball milling time is 2 h. After the ball milling is completed, perform suction filtration and drying to obtain a calcium zirconate additive.

[0182] The mass fraction of the sodium lignosulfonate solution in this example is 6.5%.

[0183] Experimental Example 1.

[0184] The only difference from Example 3 is that calcium zirconate is not added to the calcium zirconate additive.

[0185] Experimental Example 2.

[0186] The only difference from Example 3 is that montmorillonite is not added to the calcium zirconate additive.

[0187] Experimental Example 3.

[0188] The only difference from Example 3 is that manganese nitride is not added to the calcium zirconate additive.

[0189] Experimental Example 4.

[0190] 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.

[0191] Based on the above tests, continue to test the performance of Experimental Examples 1-4:

[0192]

[0193] It can be seen from Experimental Examples 1-4 that when calcium zirconate is not added to the calcium zirconate additive, the performance change trend of the product 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 trend of varying degrees of deterioration. The performance effect of the calcium zirconate additive obtained by the specific method of the present invention is the most significant, and using other methods instead is not as obvious as the effect of the present invention.

[0194] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above 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, it is intended to include all changes falling within the meaning and scope of the equivalent elements of the claims in the present invention.

[0195] 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 manner 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 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 modified filler, 4 - 7 parts of functional coupling agent, 2 - 3 parts of leveling agent, 3 - 5 parts of curing agent, 2 - 4 parts of benzoin; The preparation method of the functional coupling agent is as follows: Silicon carbide fiber, nano - titanium dioxide, and sodium stearate are added to a sodium dodecylbenzenesulfonate solution and thoroughly blended to obtain a coupling liquid. Then, boron nitride and the coupling liquid are stirred thoroughly, followed by suction filtration and drying to obtain the functional coupling agent; The specific preparation method of the modified filler is as follows: S01: Preparation of the first filler liquid: S01a: Nano - silica sol, sodium silicate solution, and carboxymethyl cellulose are blended evenly according to the weight ratio of (2 - 3):(5 - 7):1 to obtain a sodium silicate liquid; S01b: Barium titanate is irradiated in a proton irradiation chamber for 1 h with an irradiation power of 350 - 400 W. After irradiation, the irradiated barium titanate is pre - heated at 55 - 60 °C for 1 h to obtain pretreated barium titanate; 4 - 7 parts of pretreated barium titanate are added to 5 - 8 parts of the sodium silicate liquid and stirred evenly to obtain the first filler liquid; 3 - 5 parts of polytetrafluoroethylene and 2 - 4 parts of cordierite are blended and added to 5 - 8 parts of a 5% hydrochloric acid dopamine solution and mixed thoroughly to obtain the second filler liquid; The first filler liquid and the second filler liquid are blended according to the weight ratio of (5 - 7):4 and subjected to ultrasonic treatment to obtain a filler modified liquid; Calcium zirconate additive and the filler modified liquid are blended according to the weight ratio of (5 - 6):3, subjected to ball - milling treatment at a ball - milling speed of 1000 - 1500 r / min for 2 h. After ball - milling, suction filtration and drying are carried out to obtain the modified filler; The preparation method of the calcium zirconate additive is as follows: Montmorillonite, manganese nitride, and sodium lignosulfonate solution are blended evenly according to the weight ratio of (2 - 5):1:(3 - 4) to obtain a montmorillonite liquid; 4 - 6 parts of calcium zirconate, 2 - 3 parts of the montmorillonite liquid, and 1 - 2 parts of urea are blended and ball - milled at a ball - milling speed of 1500 r / min for 2 h. After ball - milling, suction filtration and drying are carried out to obtain the calcium zirconate additive.

2. The insulating powder coating for a new energy vehicle battery according to claim 1, wherein 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 coupling agent, 2.5 parts of leveling agent, 4 parts of curing agent, 3 parts of benzoin.

3. An insulating powder coating for a new energy vehicle battery according to claim 1, characterized in that, 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.

4. An insulating powder coating for a new energy vehicle battery according to claim 3, characterized in that, The mass fraction of the sodium silicate solution is 4 - 6%; the ultrasonic power of the ultrasonic treatment for blending is 400 - 500 W, and the ultrasonic treatment time is 2 h.

5. An insulating powder coating for a new energy vehicle battery according to claim 1, characterized in that, The mass fraction of the sodium lignosulfonate solution is 5 - 8%.

6. The insulating powder coating for a new energy vehicle battery according to claim 1, characterized in that The specific preparation method of the functional coupling agent is as follows: S01: Boron nitride is mixed thoroughly in a sufficient amount of 5% potassium permanganate solution, then washed with water, suction - filtered, and dried; 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 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, then filtered by suction and dried to obtain a functional coupling agent.

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

8. The preparation method of an insulating powder coating for a new energy vehicle battery according to any one of claims 1-7, characterized in that, It includes the following steps: Weigh the raw materials according to parts by weight, then mix the raw materials evenly to obtain a mixed material body. The mixed material body is sent into a twin - screw extruder for extrusion, with an extrusion temperature of 110°C. Subsequently, it is pressed into tablets, cooled, crushed, and sieved through 100 meshes to obtain an insulating powder coating.

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