Jet fire impact resistant high temperature resistant flame retardant coating and preparation method and application thereof

Abstract

This invention discloses a jet fire-resistant, high-temperature resistant, and flame-retardant coating, its preparation method, and its application. The raw materials forming the coating, by weight, comprise the following components: 20-50 parts of organosilicon resin; pigments and fillers, comprising 5-45 parts of high-temperature resistant filler and 10-30 parts of heat-insulating filler; and additives, comprising 0.05-10 parts of dispersant. This solution effectively solves the problems of traditional intumescent flame-retardant coatings used in lithium-ion batteries for new energy vehicles, such as poor high-temperature resistance (e.g., flame retardancy against jet fires at 1300-1500℃), low mechanical strength of the expanded char layer, poor adhesion, thick coating film, and poor insulation and heat-insulating performance.

Description

Technical Field

[0001] This invention relates to the field of insulating, high-temperature resistant, and flame-retardant coatings. More specifically, it relates to an insulating, high-temperature resistant, and flame-retardant coating resistant to jet fire impact, its preparation method, and its application. Background Technology

[0002] Currently, the thermal protection materials used in the new energy vehicle field mainly include mica sheets, aerogel felt pads, foamed silicone, ceramicized silicone rubber, flame-retardant plastics, and fire-retardant coatings. These materials can all reduce the hazards of thermal runaway to a certain extent. However, to date, these materials still have the following problems: 1) Few products can withstand flame-retardant tests at higher temperatures (e.g., 1300-1500℃) during thermal runaway of higher energy density batteries; 2) The coating formed after combustion has poor mechanical strength and is prone to cracking and peeling, making it unable to resist the impact of jet fire; 3) The coating has poor stability after combustion, thus losing its insulation properties; 4) The dry film thickness of the paint film is relatively high, usually greater than 0.5mm, and the construction process is cumbersome and complex, often requiring more than two spraying processes to complete. Summary of the Invention

[0003] Based on the above problems, the purpose of this invention is to provide a jet fire impact resistant, insulating, high temperature resistant, and flame-retardant coating, its preparation method, and its application, so as to solve the problems of traditional intumescent flame-retardant coatings for lithium-ion batteries of new energy vehicles, such as poor high temperature resistance (e.g., 1300-1500℃), large coating thickness, low mechanical strength of carbon layer after coating expansion, poor adhesion, and poor insulation and heat insulation performance.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] On one hand, the present invention provides a jet fire impact resistant, insulating, high temperature resistant, and flame retardant coating, wherein the raw materials forming the coating, by weight, contain the following components:

[0006] 20-50 parts of silicone resin;

[0007] Pigments and fillers, comprising 5-45 parts high-temperature resistant filler and 10-30 parts heat-insulating filler;

[0008] Additives, containing 0.05-10 parts dispersant.

[0009] Furthermore, the R / Si content in the organosilicon resin is between 1.0 and 1.8, wherein R is selected from one or more of methyl, phenyl, vinyl, phenethyl, aminopropyl, and pentyl.

[0010] Furthermore, the silicone resin has a viscosity of 50-500 cp at 25°C.

[0011] Furthermore, the high-temperature resistant filler is selected from one or more of the following: silica, modified bentonite, calcined kaolin, expandable vermiculite, sepiolite, titanium dioxide, perlite, wollastonite, mica powder, silicon carbide, calcium carbonate, silicon nitride, boron carbide, boron nitride, aluminum nitride, clay, and boehmite.

[0012] Furthermore, the heat-insulating filler is selected from one or more of feldspar powder, carbon nanotubes, hollow glass fiber powder, hollow ceramic microspheres, hollow glass powder, zirconium oxide, inorganic silicate nanotubes, and inorganic silicate nanowires.

[0013] Furthermore, the mass ratio of the high-temperature resistant filler to the heat-insulating filler is 1:1 to 5:1.

[0014] Furthermore, the mass ratio of the total amount of the silicone resin to the high-temperature resistant filler and the heat-insulating filler is 1:1 to 1:3.5.

[0015] Furthermore, the raw material also contains 0-25 parts of flame retardant.

[0016] Furthermore, the flame retardant is selected from one or more of aluminum hydroxide, zinc borate, magnesium hydroxide, phosphate flame retardants, modified phosphate flame retardants, and organophosphonate flame retardants.

[0017] Furthermore, the organophosphonate flame retardant is selected from one or more of phosphites and phosphates.

[0018] Furthermore, the phosphate flame retardant is selected from one or more of zinc phosphate, aluminum phosphate, ammonium pyrophosphate, diammonium hydrogen phosphate, and ammonium polyphosphate.

[0019] Furthermore, the modified phosphate flame retardant is selected from at least one of silane coupling agents, melamine, melamine resin, and epoxy resin to modify the phosphate flame retardant.

[0020] Furthermore, in the raw materials, the pigment-to-binder ratio is 1:1 to 4:1.

[0021] Furthermore, the additives also include 0-10 parts of defoamer and 0-10 parts of rheology modifier.

[0022] Furthermore, the raw materials also contain 0-35 parts of solvent.

[0023] Furthermore, the pigment filler also contains 0-20 parts of pigment.

[0024] In another aspect, the present invention provides a method for preparing the jet fire-resistant, high-temperature flame-retardant coating as described above, comprising the following steps:

[0025] Mix all the raw material components evenly and grind them until the fineness of the resulting mixture is ≤100µm.

[0026] On another aspect, the present invention provides the application of the jet fire-resistant, heat-resistant, flame-retardant coating described above in the coating of batteries.

[0027] Furthermore, the battery is a power battery, preferably a high-energy-density battery.

[0028] The beneficial effects of this invention are as follows:

[0029] The jet fire-resistant, high-temperature resistant, and flame-retardant coating provided in this invention, through the selection of suitable film-forming resins in its raw materials, the comprehensive selection and combination of suitable high-temperature resistant fillers and heat-insulating fillers, and preferably flame retardants, ensures that the coating's high-temperature resistance and heat insulation performance meet the flame-retardant test requirements at 1300-1500℃, guaranteeing the stability, flame retardancy, and insulation of the coating after combustion. Furthermore, the coating formed after application exhibits high stability before and after the combustion test, capable of withstanding the impact of jet fire, and the insulation performance of the coating is excellent before and after the combustion test. In addition, this coating can achieve ultra-thin coating. For example, when the dry film thickness is 0.15mm, it can be sprayed through one or two applications without the problem of dry film cracking during large-area spraying. Detailed Implementation

[0030] To more clearly illustrate the present invention, the following description, in conjunction with preferred embodiments, further clarifies the invention. Those skilled in the art should understand that the specific descriptions below are illustrative rather than restrictive, and should not be construed as limiting the scope of protection of the present invention.

[0031] According to a specific embodiment of the present invention, a jet fire impact resistant, high temperature resistant, and flame retardant coating is provided. The raw materials forming the coating contain the following components by mass:

[0032] 20-50 parts of silicone resin;

[0033] Pigments and fillers, comprising 5-45 parts high-temperature resistant filler and 10-30 parts heat-insulating filler;

[0034] Additives, containing 0.05-10 parts dispersant.

[0035] This jet-fire-impact resistant, high-temperature resistant, and flame-retardant coating is particularly suitable for coating the PACK (top cover, side panels, end plates, etc.) of power batteries, especially high-energy-density batteries (such as batteries for new energy vehicles). The coating applied with this material can protect the entire power battery system in the event of thermal runaway in a single or multiple cell, ensuring that the battery system does not catch fire or explode for 5 minutes or longer after a single cell experiences thermal runaway, thus providing time for personnel to escape. Compared with traditional thermal protection materials, this coating has the advantages of easy application, high production stability, good adhesion to irregularly shaped substrates, light weight, small size, high temperature resistance (it can pass the test of burning in a flame at 1000-1300℃ for 30 minutes, and also the test of burning in a flame at 1300-1500℃ for 15 minutes), high electrical insulation (it can pass the DC / AC 5000V, 60s insulation test before combustion with leakage current ≤1mA, and after combustion it can pass the DC / AC 1000V, 60s insulation test with leakage current ≤1mA), high coating strength before and after combustion, resistance to jet fire impact, and excellent flame retardant properties.

[0036] The silicone resin used in this embodiment has an R / Si content between 1.0 and 1.8, wherein R is selected from one or more of methyl, phenyl, vinyl, phenethyl, aminopropyl, and pentyl; the silicone resin has a viscosity of 50-500 cp at 25°C. This silicone resin exhibits certain high-temperature resistance and a relatively high thermal decomposition temperature; it can also form certain chemical bonds with the substrate, improving adhesion.

[0037] In some examples, the high-temperature resistant filler is selected from one or more of silica, modified bentonite, calcined kaolin, expandable vermiculite, sepiolite, titanium dioxide, perlite, wollastonite, mica powder, silicon carbide, calcium carbonate, silicon nitride, boron carbide, boron nitride, aluminum nitride, clay, and boehmite. Exemplary amounts of the high-temperature resistant filler include, but are not limited to, 10-44 parts, 10-30 parts, 10-20 parts, 20-44 parts, 20-30 parts, 30-44 parts, 10 parts, 20 parts, 30 parts, and 44 parts.

[0038] Preferably, the high-temperature resistant filler is selected from two or more of the following: silica, modified bentonite, calcined kaolin, expandable vermiculite, sepiolite, titanium dioxide, perlite, wollastonite, mica powder, silicon carbide, calcium carbonate, silicon nitride, boron carbide, boron nitride, aluminum nitride, clay, and boehmite.

[0039] In some examples, the thermal insulation filler is selected from one or more of feldspar powder, carbon nanotubes, hollow glass fiber powder, hollow ceramic microspheres, hollow glass powder, zirconium oxide, inorganic silicate nanotubes, and inorganic silicate nanowires. Exemplary amounts of the thermal insulation filler include, but are not limited to, 15-30 parts, 16-24 parts, 16-20 parts, 20-24 parts, 16 parts, 20 parts, and 24 parts.

[0040] Preferably, the heat-insulating filler is selected from two or more of feldspar powder, carbon nanotubes, hollow glass fiber powder, hollow ceramic microspheres, hollow glass powder, zirconium oxide, inorganic silicate nanotubes, and inorganic silicate nanowires. For example, the heat-insulating filler is selected from two or more of feldspar powder, carbon nanotubes, hollow ceramic microspheres, hollow glass powder, and zirconium oxide. In this case, the material has better reflective and radiative heat dissipation effects and superior heat insulation performance.

[0041] The aforementioned high-temperature resistant and heat-insulating fillers not only have high chemical stability but also a certain degree of hydrolytic stability, and will not precipitate during resistance tests, thus exhibiting good barrier properties.

[0042] In some preferred examples, the mass ratio of the high-temperature resistant filler to the heat-insulating filler is 1:1-5:1. In this case, the resulting coating film, with a low film thickness, exhibits reduced volume and mass shrinkage and superior high-temperature resistance at 1300-1500℃. In some specific examples, the mass ratio of the high-temperature resistant filler to the heat-insulating filler includes, but is not limited to, 1:1-3:1, 1:1-2.75:1, 1:1-2:1, 1:1-1.5:1, 1:1-1.25:1, 1.25:1-3:1, 1.25:1-2.75:1, 1.25:1-2:1, 1.25:1-1.5:1, 1:1.5-3:1, 1:1.5-2.75:1, 1:1.5-2:1, 2.75:1-3:1, 1:1, 1.25:1, 2.75:1, etc.

[0043] In some preferred examples, the mass ratio of the silicone resin to the total amount of high-temperature resistant filler and heat-insulating filler is 1:1 to 1:3.5. In this case, the pigments and fillers can better help the silicone resin improve the high-temperature resistance of the coating and reduce volume and mass shrinkage at 1300-1500℃. For example, the mass ratio of the silicone resin to the total amount of high-temperature resistant filler and heat-insulating filler includes, but is not limited to, 1:1-1:3, 1:1-1:2.7, 1:1-1:2, 1:1-1:1.6, 1:1.6-1:3, 1:1.6-1:2.7, 1:1.6-1:2, 1:2-1:3, 1:2-1:2.7, 1:2.7-1:3, 1:1.6, 1:2, and 1:2.7.

[0044] In some examples, the raw materials also contain flame retardants. Flame retardants suitable for this embodiment are preferably those with good compatibility with the resin system, halogen-free and environmentally friendly properties, certain hydrolytic stability, and high chemical stability, and do not precipitate during resistance tests. Those skilled in the art can select to add flame retardants according to actual conditions, and the preferred amount of flame retardant added is 0-25 parts. Exemplary examples include, but are not limited to, 0 parts, 5-20 parts, 5-15 parts, 5-10 parts, 10-15 parts, 10-20 parts, 15 parts, 10 parts, and 5 parts.

[0045] Preferably, the flame retardant is selected from one or more of aluminum hydroxide, zinc borate, magnesium hydroxide, phosphate flame retardants, modified phosphate flame retardants, and organophosphonate flame retardants.

[0046] For example, the organophosphonate flame retardant is selected from one or more of phosphites and phosphates.

[0047] For example, the phosphate flame retardant is selected from one or more of zinc phosphate, aluminum phosphate, ammonium pyrophosphate, diammonium hydrogen phosphate, and ammonium polyphosphate.

[0048] For example, the modified phosphate flame retardant is selected from those obtained by modifying phosphate flame retardants with at least one of silane coupling agents, melamine, melamine resin, and epoxy resin. The modification method can be a conventional modification method in the art, such as surface grafting or surface coating, which will not be elaborated here.

[0049] In some preferred examples, the pigment-to-binder ratio of the raw materials is 1:1-4:1. If the pigment-to-binder ratio is too low, the resulting coating will have poor flame retardancy and high-temperature resistance; if the pigment-to-binder ratio is too high, the resulting coating will have poor adhesion, insulation properties, and durability. Exemplary pigment-to-binder ratios include, but are not limited to, 1:1-3:1, 1:1-2.5:1, 1:1-2:1, 1.5:1-3:1, 1.5:1-2.5:1, 1.5:1-2:1, 2:1-3:1, 2:1-2.5:1, 1.71:1-2.95:1, 1.71:1-2.4:1, 2.4:1-2.95:1, 1.71:1, 2.4:1, and 2.95:1.

[0050] It should be noted that the "pigment-to-binder ratio" in this embodiment refers to the ratio of the total amount of pigments and fillers (high-temperature resistant fillers, heat-insulating fillers, pigments (if any)) and flame retardants in the coating raw materials to the mass ratio of the silicone resin.

[0051] In some examples, the dispersant is preferably one or more of the following: low molecular weight and high molecular weight cationic, anionic, and amphiphilic compounds, which have certain anchoring groups, can interact with some additives in the system to achieve wetting, dispersion, and anti-settling effects, and are suitable for use in aqueous systems. Exemplary dispersants include, but are not limited to, BYK2000 and / or BYK164.

[0052] In this embodiment, other additives, such as defoamers and rheology modifiers, may be added as needed. In some examples, the additives include 0-10 parts of defoamer and 0-10 parts of rheology modifier.

[0053] Suitable defoamers for this embodiment include, but are not limited to, one or more of polyether defoamers, mineral oil defoamers, and modified silicone defoamers. The amount of defoamer added includes, but is not limited to, 0 parts, 0.5-5 parts, 0.5-2 parts, 0.5-1.5 parts, 0.5-1 part, 1-5 parts, 1-2 parts, 1-1.5 parts, and 1.5 parts. Examples include BYK077 and Tego Foamex N.

[0054] The rheology modifiers suitable for use in this embodiment include, but are not limited to, one or more of organobentonite, modified polyurea compounds, castor oil derivatives, fumed silica, polyolefin microparticles, and polyamide waxes. The amount of rheology modifier added includes, but is not limited to, 0 parts, 0.5-5 parts, 0.5-3 parts, 0.5-2 parts, 0.5-1.5 parts, 0.5-1 part, 1-5 parts, 1-3 parts, 1-2 parts, 1 part, 2 parts, and 3 parts.

[0055] In some examples, in this embodiment, the raw material further comprises 0-35 parts of solvent. The amount of solvent added can be 0 parts, 5-30 parts, 5-20 parts, 5-15 parts, 5-10 parts, 10-30 parts, 10-20 parts, 10-15 parts, 10 parts, 15 parts, etc. Exemplary solvents include, but are not limited to, one or more of ethyl acetate, butyl acetate, N-methylpyrrolidone, propylene glycol methyl ether acetate, etc.

[0056] In this embodiment, pigments can also be added as needed. The amount of pigment added can be 0-20 parts. Specifically, it includes, but is not limited to, 0 parts, 1-15 parts, 1-10 parts, 1-5 parts, 5-10 parts, 5-20 parts, 5 parts, etc. The pigments include, but are not limited to, white pigments and black pigments. Suitable black pigments mainly refer to inorganic pigments with certain high-temperature resistance properties, such as one or more of iron manganese black, iron oxide black, and graphite. Suitable white pigments mainly refer to one or more of titanium dioxide, zinc oxide, zinc sulfide, and barium sulfate.

[0057] In some examples, the total weight of the raw materials described in this embodiment is 100 parts.

[0058] According to another specific embodiment of the present invention, a method for preparing the jet fire impact resistant, high temperature resistant, and flame retardant coating as described above is provided, the method comprising the following steps:

[0059] Mix all the raw material components evenly and grind them until the fineness of the resulting mixture is ≤100µm.

[0060] In some more specific examples, the preparation method includes the following steps:

[0061] At room temperature, mix the raw materials of each component at a speed of 100-4000 r / min until homogeneous;

[0062] The above-mentioned uniformly mixed solution is placed in a high-speed stirring tank containing zirconium beads and dispersed at a speed of 100-4000 r / min for 30-180 min. The mixture is then filtered through a 150-mesh filter to ensure that the fineness of the resulting solution is ≤100µm.

[0063] According to another specific embodiment of the present invention, the application of the jet fire impact resistant, high temperature resistant, and flame retardant coating described above in the coating of batteries is provided.

[0064] The exemplary battery may be a power battery, especially a high-energy-density battery. For example, in some examples, the battery is a lithium-ion battery, preferably a lithium-ion battery for new energy vehicles.

[0065] The coating can be applied to all areas of the battery that require protection. Exemplary coating locations include, but are not limited to, the battery's top cover and side panels.

[0066] In some specific examples, the application involves applying the jet fire-impact resistant, high-temperature resistant, and flame-retardant coating to the battery to form a coating. Specific coating methods include, but are not limited to:

[0067] The coating is applied to the surface of the battery to be coated (preferably treated by sanding and degreasing before use) and then cured.

[0068] In some examples, the curing conditions may be: drying at 200-230°C for 30-60 minutes.

[0069] In some specific examples, depending on the formulation implementation and coating thickness, the curing conditions may be: first dry at 120℃ for 30-60 minutes, then dry at 200-230℃ for 30-60 minutes.

[0070] In some examples, when the dry film thickness is ≤150µm, it can be surface dried at room temperature (25°C) for about 10 minutes before curing.

[0071] The above-mentioned application methods include, but are not limited to, spraying (such as air spraying), scraping, and brushing.

[0072] Before applying the above coating to the surface of the battery to be coated, it can be determined whether to use a thinner (ethyl acetate, butyl acetate, propylene glycol methyl ether acetate, etc.) based on the flow of the mixture. Usually, the mass ratio of the mixture to the thinner is 1:0-1:0.5. Based on the coating thickness, determine the appropriate spraying parameters and carry out the spraying.

[0073] The specific embodiments of the present invention will be described below with reference to some specific examples:

[0074] Example 1

[0075] A method for preparing a jet fire impact resistant, high temperature resistant, and flame retardant coating includes the following steps:

[0076] Based on a feed rate of 100 kg, mix 35 kg of silicone resin (R / Si = 1.2, R = methyl, viscosity = 100 cps), 8 kg each of mica powder, wollastonite, and calcined kaolin, 6 kg of boehmite, 15 kg of hollow ceramic microspheres, 9 kg of expandable vermiculite, 1 kg of carbon nanotubes, 2 kg of dispersant BYK-2000, 1.5 kg of organobentonite, 5 kg of titanium dioxide, and 1.5 kg of Tego Foamex N at a speed of 100-4000 r / min until homogeneous.

[0077] The above mixed solution was then transferred to a high-speed stirring tank containing zirconium beads and dispersed at a speed of 100-4000 r / min for 30-180 min. The mixture was then filtered through a 150-mesh filter to ensure that the fineness of the resulting mixture was ≤100µm, thus obtaining the coating.

[0078] The coating product was sprayed onto a DC08 steel or aluminum plate to prepare a white sample with uniform thickness and a smooth appearance.

[0079] Example 2

[0080] A method for preparing a jet fire impact resistant, high temperature resistant, and flame retardant coating includes the following steps:

[0081] Based on a feed rate of 100 kg, mix 10 kg of N-methylpyrrolidone, 25 kg of silicone resin (R / Si = 1.3, R = phenyl, viscosity = 350 cp), 10 kg of ammonium polyphosphate, 5 kg of aluminum hydroxide, 5 kg each of mica powder, aluminum nitride, modified bentonite, and calcium carbonate, 1 kg of carbon nanotubes, 15 kg of hollow ceramic microspheres, 4 kg of hollow glass powder, 2.5 kg of dispersant BYK-164, 1.5 kg of TegoFoamex N, 1 kg of polyamide wax, and 5 kg of iron oxide black at a speed of 100-4000 r / min until homogeneous.

[0082] The above mixed solution was then transferred to a high-speed stirring tank containing zirconium beads and dispersed at a speed of 100-4000 r / min for 30-180 min. The mixture was then filtered through a 150-mesh filter to ensure that the fineness of the resulting mixture was ≤100µm, thus obtaining the coating.

[0083] The coating product was sprayed onto a DC08 steel or aluminum plate to prepare a black sample with uniform thickness and a smooth appearance.

[0084] Example 3

[0085] A method for preparing a jet fire impact resistant, high temperature resistant, and flame retardant coating includes the following steps:

[0086] Based on a feed rate of 100 kg, mix 15 kg of propylene glycol methyl ether acetate, 20 kg of silicone resin (R / Si = 1.5, R = methyl and phenyl, viscosity = 500 cp), 5 kg of zinc borate, 10 kg each of mica powder, wollastonite, and calcium carbonate, 8 kg of zirconium oxide, 10 kg of hollow ceramic microspheres, 1 kg of carbon nanotubes, 5 kg of feldspar powder, 2.5 kg of dispersant BYK-164, 1.5 kg of defoamer Tego Foamex N, and 2 kg of fumed silica at a speed of 100-4000 r / min until homogeneous.

[0087] The above mixed solution was then transferred to a high-speed stirring tank containing zirconium beads and dispersed at a speed of 100-4000 r / min for 30-180 min. The mixture was then filtered through a 150-mesh filter to ensure that the fineness of the resulting mixture was ≤100µm, thus obtaining the coating.

[0088] The coating product was sprayed onto a DC08 steel or aluminum plate to prepare a gray sample with uniform thickness and smooth appearance.

[0089] The properties of the products prepared in the above embodiments are shown in Table 1 below.

[0090] The performance testing standards include:

[0091] 1) Adhesion test: The paint film was subjected to a cross-cut adhesion test in accordance with the national standard GB / T9286-2021;

[0092] 2) Fire resistance performance test: According to customer needs, select a specific gas source that can reach 1000-1300℃ to conduct fire resistance performance test. During the combustion test, attach a thermocouple to the back of the substrate and test and record the temperature of the uncoated surface during the 30-minute combustion process; there is no specific national standard, but the whole package test must meet GB 38031-2020.

[0093] 3) Insulation withstand voltage test: The insulation withstand voltage of the varnish film shall be tested in accordance with the national standard GB / T 1408.1-2016;

[0094] 4) Water resistance test, damp heat resistance test and high and low temperature alternation test: The samples were tested for water resistance, damp heat resistance and high and low temperature alternation test according to GB 38031-2020.

[0095] 5) 40℃ heat storage: Tested according to GB / T 6753.3 standard.

[0096] Table 1 Product Parameters of Examples

[0097]

[0098] Comparative Example 1

[0099] A method for preparing a coating includes the following steps:

[0100] Based on a feed rate of 100 kg, mix 60 kg of silicone resin (R / Si = 1.3, R = phenyl, viscosity = 350 cp), 10 kg of ammonium polyphosphate, 5 kg each of mica powder, calcium carbonate, and zirconium oxide, 10 kg of hollow ceramic microspheres, 1.5 kg of dispersant BYK-164, 1.5 kg of defoamer Tego Foamex N, and 2 kg of fumed silica at a speed of 100-4000 r / min until homogeneous.

[0101] The above mixed solution was then transferred to a high-speed stirring tank containing zirconium beads and dispersed at a speed of 100-4000 r / min for 30-180 min. The mixture was then filtered through a 150-mesh filter to ensure that the fineness of the resulting mixture was ≤100µm, thus obtaining the coating.

[0102] The coating was sprayed onto a DC08 steel or aluminum plate to prepare a gray sample with uniform thickness and smooth appearance.

[0103] The pigment-to-binder ratio in this comparative example is relatively low, resulting in poor flame retardancy and high-temperature resistance of the coating.

[0104] Comparative Example 2

[0105] A method for preparing a coating includes the following steps:

[0106] Based on a feed rate of 100 kg, mix 15 kg of silicone resin (R / Si = 1.5, R = methyl and phenyl, viscosity = 500 cp), 10 kg of zinc borate, 10 kg of ammonium polyphosphate, 7 kg each of mica powder, calcium carbonate, boehmite, zirconium oxide, and calcined kaolin, 10 kg of hollow ceramic microspheres, 10 kg of hollow glass powder, 2 kg of dispersant BYK-164, 2 kg of defoamer Tego Foamex N, 2 kg of fumed silica, and 4 kg of titanium dioxide at a speed of 100-4000 r / min until homogeneous.

[0107] The above mixed solution was then transferred to a high-speed stirring tank containing zirconium beads and dispersed at a speed of 100-4000 r / min for 30-180 min. The mixture was then filtered through a 150-mesh filter to ensure that the fineness of the resulting mixture was ≤100µm, thus obtaining the coating.

[0108] The coating was sprayed onto a DC08 steel or aluminum plate to prepare a white sample with uniform thickness and a smooth appearance.

[0109] The pigment-to-binder ratio of this comparative example is relatively high, resulting in poor coating adhesion, insulation performance, and durability.

[0110] Comparative Example 3

[0111] A method for preparing a coating includes the following steps:

[0112] Based on a feed rate of 100 kg, the following components are used: 10 kg solvent, 25 kg silicone resin (R / Si ratio 1.5, R representing methyl and phenyl, viscosity 500 cp), 10 kg ammonium polyphosphate, 5 kg magnesium hydroxide, 7 kg each of mica powder, calcined kaolin, boehmite, wollastonite, and silicon carbide, 5 kg hollow ceramic microspheres, 2.5 kg dispersant BYK-2000, 1.5 kg defoamer Tego Foamex N, 1 kg organobentonite, and 5 kg iron oxide black. The mixture is stirred evenly at a speed of 100-4000 rpm. The resulting solution is then transferred to a high-speed mixing tank containing zirconium beads and dispersed at 100-4000 rpm for 30-180 min. The mixture is then filtered through a 150-mesh screen to ensure a fineness ≤100 µm, yielding the coating.

[0113] The coating was sprayed onto a DC08 steel or aluminum plate to prepare a black sample with uniform thickness and a smooth appearance.

[0114] In this comparative example, the types and amounts of heat-insulating fillers were relatively small, and the high-temperature resistance and heat insulation performance of the coating were poor.

[0115] The properties of the products prepared in the above comparative examples are shown in Table 2 below.

[0116] Table 2 Comparative Product Parameters

[0117]

[0118] Comparative Example 4

[0119] Similar to Example 2, the difference is that the heat-insulating fillers carbon nanotubes, hollow ceramic microspheres, and hollow glass powder are not added. Meanwhile, the amounts of high-temperature resistant fillers mica powder, aluminum nitride, modified bentonite, and calcium carbonate are each changed to 10 kg, while other conditions remain unchanged. In this case, the resulting coating, when subjected to a flame-retardant test at 1000-1300℃ for 30 minutes, showed a back surface temperature >500℃, indicating an excessively high temperature.

[0120] Comparative Example 5

[0121] Similar to Example 2, except that the high-temperature resistant fillers mica powder, aluminum nitride, modified bentonite, and calcium carbonate were not added; simultaneously, the amounts of the heat-insulating fillers carbon nanotubes, hollow ceramic microspheres, and hollow glass powder were changed to 2 kg, 30 kg, and 8 kg, respectively, while other conditions remained unchanged. In this case, the resulting coating failed to meet insulation standards after combustion. During a flame-retardant test at 1000-1300℃ for 30 minutes, the temperature on the back of the coating exceeded 500℃, indicating excessively high temperatures. During a flame-retardant test at 1300-1500℃ for 15 minutes, the coating burned through, and the substrate was destroyed.

[0122] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. For those skilled in the art, other variations or modifications can be made based on the above description. It is impossible to exhaustively list all the implementation methods here. All obvious variations or modifications derived from the technical solutions of the present invention are still within the protection scope of the present invention.

Claims

1. A high temperature resistant flame resistant coating resistant to jet fire impact, characterized in that, The raw materials forming the coating comprise the following components, based on a total mass of 100 parts: The ingredients are: 35 parts silicone resin, 8 parts mica powder, 8 parts wollastonite, 8 parts calcined kaolin, 6 parts boehmite, 15 parts hollow ceramic microspheres, 9 parts expandable vermiculite, 1 part carbon nanotubes, 2 parts dispersant BYK-2000, 1.5 parts organobentonite, 5 parts titanium dioxide, and 1.5 parts Tego Foamex N. The organosilicon resin has an R / Si content of 1.2, wherein R is selected from methyl groups; The silicone resin has a viscosity of 100 cp at 25°C.

2. The preparation method of the jet fire-resistant, high-temperature resistant, and flame-retardant coating as described in claim 1, characterized in that, Includes the following steps: Mix all the raw material components evenly and grind them until the fineness of the resulting mixture is ≤100µm.

3. The application of the jet fire-resistant, heat-resistant, high-temperature flame-retardant coating as described in claim 1 in battery coating.

4. The application according to claim 3, characterized in that, The battery is a power battery.

5. The application according to claim 3, characterized in that, The battery is a high-energy-density battery.

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