An explosion-proof coating material, a preparation method and application thereof

Abstract

An explosion-proof paint as well as a preparation method and application thereof. The raw material of the paint is composed of component A and component B, and the mass ratio of component A and component B is 100:100 to 100:50; wherein, component A comprises, by weight parts, 70-90 parts of epoxy resin, 3-8 parts of active diluent, 2-6 parts of silane coupling agent and 0.5-3 parts of fumed silica; component B comprises, by weight parts, 30-60 parts of nano-reinforced curing agent, 5-30 parts of aluminum hydroxide, 8-15 parts of ammonium polyphosphate, 3-10 parts of expanded graphite, 3-8 parts of zinc phosphate, 3-12 parts of hollow glass microsphere, 3-15 parts of hexagonal boron nitride, 3-10 parts of silicon carbide whisker, 2-5 parts of graphene dispersion liquid, 5-10 parts of solvent, 0.2-1.5 parts of dispersing agent and 0.1-1 part of defoaming agent. The paint has the functions of toughening, flame retardation, heat conduction and non-combustible gas release, and can be applied to flame-retardant explosion-proof products.

Description

Technical Field

[0001] This invention relates to the field of special functional materials technology, and in particular to an explosion-proof coating for deep well aluminum casting and processing, its preparation method and application. Background Technology

[0002] Deep well casting is a key process in the aluminum processing industry, mainly used to produce large-sized aluminum ingots or billets. In this process, molten aluminum is injected into a deep well casting machine and rapidly solidifies upon contact with cooling water. However, the deep well casting environment presents significant safety hazards: the risk of steam explosion—when molten aluminum (temperature approximately 700°C) comes into contact with cooling water, a large amount of steam may be generated instantaneously, causing a sharp increase in pressure and potentially triggering a steam explosion; the risk of hydrogen explosion—the reaction between molten aluminum and water can produce hydrogen gas, which, after accumulating in a confined space, may explode upon contact with a spark or high temperature; and the requirement for mechanical strength—the coating needs to possess good adhesion and toughness to withstand the mechanical stress during casting, while the high temperatures generated during the explosion process can cause damage, and high ambient temperatures can easily lead to coating failure.

[0003] Existing research has demonstrated the ability to achieve high-temperature resistance and flame retardancy by adding flame retardants to epoxy resin coatings. For example, CN202211530336.X uses a blend of melamine, modified ammonium polyphosphate, and pentaerythritol as a flame retardant, enabling the epoxy coating to withstand flame impact at 1300℃ without damage. CN201610740995.4 shows that the addition of a phosphorus-nitrogen composite flame retardant / hypophosphite flame retardant increases the fire resistance time of the epoxy coating to over 25 minutes. However, adding flame retardants may lead to brittleness and reduced impact resistance in the coating. Insufficient thermal conductivity can also exacerbate the risk of localized overheating and rapid water vapor generation. CN202310805342.X addresses this by adding graphene to increase thermal conductivity. To improve the active explosion suppression and damage reduction effects of coatings, it is necessary to optimize flame retardant properties to enhance high-temperature resistance, increase thermal conductivity to promote heat diffusion, and improve mechanical strength to reduce explosion damage.

[0004] Therefore, there is a need to develop an explosion-proof coating that integrates toughening, flame retardancy, thermal conductivity, and non-combustible gas release functions. Summary of the Invention

[0005] The following is an overview of the subject matter described in detail herein. This overview is not intended to limit the scope of the claims.

[0006] The present invention aims to provide an epoxy explosion-proof coating and its preparation method. Through the synergistic effect of epoxy resin matrix and self-made nano-reinforced curing agent, the coating achieves high strength, high thermal conductivity, flame retardancy and explosion-proof functions in one, solving the problems of existing coatings being brittle, having poor thermal conductivity and limited functions.

[0007] The objective of this application can be achieved through the following technical solutions:

[0008] The first aspect of this application provides an explosion-proof coating, wherein the raw materials of the explosion-proof coating are composed of component A and component B, and the mass ratio of component A to component B is 100:100 to 100:50; wherein:

[0009] Component A, by weight, comprises: 70-90 parts epoxy resin, 3-8 parts reactive diluent, 2-6 parts silane coupling agent, and 0.5-3 parts fumed silica.

[0010] Component B, by weight, comprises: 30-60 parts of nano-reinforced curing agent, 5-30 parts of aluminum hydroxide, 8-15 parts of ammonium polyphosphate, 3-10 parts of expanded graphite, 3-8 parts of zinc phosphate, 3-12 parts of hollow glass microspheres, 3-15 parts of hexagonal boron nitride, 3-10 parts of silicon carbide whiskers, 2-5 parts of graphene dispersion, 5-10 parts of solvent, 0.2-1.5 parts of dispersant, and 0.1-1 parts of defoamer;

[0011] The nano-reinforced curing agent (N-EPCA) comprises, by weight: 60-80 parts matrix curing agent, 15-25 parts elastomer toughening agent, 5-10 parts nano-reinforced filler, 1-3 parts accelerator, 2-4 parts aminosilane coupling agent and 0.5-1.5 parts molecular sieve.

[0012] In one exemplary embodiment, component A, by weight, comprises 70-90 parts epoxy resin, 3-8 parts reactive diluent, 2-6 parts silane coupling agent, and 0.5-3 parts fumed silica.

[0013] In one exemplary embodiment, by weight, component B comprises 30-60 parts of nano-reinforced curing agent, 5-30 parts of aluminum hydroxide, 8-15 parts of ammonium polyphosphate, 3-10 parts of expanded graphite, 3-8 parts of zinc phosphate, 3-12 parts of hollow glass microspheres, 3-15 parts of hexagonal boron nitride, 3-10 parts of silicon carbide whiskers, 2-5 parts of graphene dispersion, 5-10 parts of solvent, 0.2-1.5 parts of dispersant, and 0.1-1 parts of defoamer.

[0014] In one exemplary embodiment, the nano-reinforced curing agent, by weight, comprises 60-80 parts of matrix curing agent, 15-25 parts of elastomer toughening agent, 5-10 parts of nano-reinforced filler, 1-3 parts of accelerator, 2-4 parts of aminosilane coupling agent and 0.5-1.5 parts of molecular sieve.

[0015] In one exemplary embodiment, the nano-reinforced curing agent comprises: a matrix curing agent being a low molecular weight polyamide resin with a number average molecular weight of 500-2000 g / mol; an elastomer toughening agent being an amino-terminated liquid nitrile butadiene rubber (ATBN), an acrylate emulsion (50±5wt%), or maleic anhydride-grafted polyolefin (POE-g-MAH); a nano-reinforced filler being aminosilane-modified nano-silica or silicate clay; a accelerator being a phenolic amine accelerator; an aminosilane coupling agent being KH-550 or KH902; and / or a type 3A molecular sieve.

[0016] In one exemplary embodiment, the matrix curing agent in the nano-reinforced curing agent is polyamide 650 with an amine value of 200 ± 20; type 203 polyamide with an amine value of 200 ± 20; or type 200 polyamide with an amine value of 215 ± 15; the elastomer toughening agent is amino-terminated liquid nitrile butadiene rubber (ATBN); the nano-reinforced filler is aminosilane-modified nano-silica with a particle size of 20 nm, or bentonite or montmorillonite with a particle size of 20-200 nm; the accelerator is DMP-30; and / or the aminosilane coupling agent is KH-550.

[0017] In one exemplary embodiment, the matrix curing agent in the nano-reinforced curing agent is polyamide 650 with an amine value of 200 ± 20; and / or the nano-reinforced filler is aminosilane-modified nano silica with a particle size of 20 nm.

[0018] In one exemplary embodiment, in the explosion-proof coating, the epoxy resin is E42, E44, E51, or E54; the reactive diluent is a glycidyl ether or an epoxy ester-ether copolymer; the silane coupling agent is an epoxy-based silane; the fumed silica is hydrophobic fumed silica; the solvent is xylene; the dispersant is BYK-163; the defoamer is BYK-054; and / or the solid content of the graphene dispersion is 0.5 w / w.

[0019] In one exemplary embodiment, the epoxy resin in the explosion-proof coating is E51; the reactive diluent is C. 12 -C 14 One or more of alkyl glycidyl ether (AGE), phenyl glycidyl ether, propylene glycidyl ether, o-cresol glycidyl ether, and 1,4-butanediol diglycidyl ether; the silane coupling agent is KH-560, KH-563, or KH-567; and / or the fumed silica is R972.

[0020] In one exemplary embodiment, the reactive diluent in the explosion-proof coating is C. 12 -C 14Alkyl glycidyl ether (AGE); and / or the silane coupling agent is KH-560.

[0021] The second aspect of this application provides a method for preparing the above-mentioned explosion-proof coating, comprising the following steps:

[0022] 1) Preparation of component A:

[0023] Add 70-90 parts epoxy resin, 3-8 parts reactive diluent, 2-6 parts silane coupling agent, and 0.5-3 parts fumed silica into a container in sequence, stir evenly, filter, seal and store for later use.

[0024] 2) Preparation of component B:

[0025] 2-i) In a dispersion vessel, add 5-10 parts solvent, 0.2-1.5 parts dispersant, and 0.1-1 parts defoamer, and stir until homogeneous;

[0026] 2-ii) Slowly add 30-60 parts of nano-reinforced curing agent and stir until homogeneous;

[0027] 2-iii) Add 5-30 parts aluminum hydroxide, 8-15 parts ammonium polyphosphate, 3-10 parts expanded graphite, 3-8 parts zinc phosphate, 3-12 parts hollow glass microspheres, 3-15 parts hexagonal boron nitride, and 3-10 parts silicon carbide whiskers sequentially, and continue stirring to ensure that these fillers are evenly dispersed; and

[0028] 2-iv) Add 2-5 parts of graphene dispersion, stir until homogeneous, filter to obtain a homogeneous mixture, and seal in packaging for later use; and

[0029] 3) Mix component A and component B at a mass ratio of 100:100 to 100:50, and stir until homogeneous to obtain the explosion-proof coating.

[0030] The nano-reinforced curing agent is prepared through the following steps:

[0031] Add 50-60 parts of matrix curing agent and 15-25 parts of elastomer toughening agent to a four-necked flask, and stir at 80-90℃ under nitrogen protection to allow the reaction to proceed.

[0032] Cool down to 60℃, slowly add 5-10 parts of nano-reinforced filler under high-speed shear at 5000rpm, and disperse at 1000rpm to ensure uniform dispersion of nanoparticles without agglomeration;

[0033] Adjust the rotation speed to 300 rpm, add 10-20 parts of matrix curing agent, 1-3 parts of accelerator, 2-4 parts of aminosilane coupling agent, and 0.5-1.5 parts of molecular sieve. Continue stirring at 70-80℃ to ensure thorough mixing and reaction of all components.

[0034] Stop heating and allow it to cool naturally to below 40°C. Filter to obtain the nano-reinforced curing agent.

[0035] In some exemplary embodiments, the method includes the following steps:

[0036] 1) Preparation of component A:

[0037] Add 70-90 parts epoxy resin, 3-8 parts reactive diluent, 2-6 parts silane coupling agent, and 0.5-3 parts fumed silica into a container in sequence, stir at 400-600 rpm for 40 minutes, filter through a 100-mesh filter, and seal for storage.

[0038] 2) Preparation of component B:

[0039] 2-i) In a dispersion vessel, add 5-10 parts solvent, 0.2-1.5 parts dispersant, and 0.1-1 parts defoamer, and stir evenly at 300-500 rpm to avoid the generation of bubbles;

[0040] 2-ii) Slowly add 30-60 parts of nano-reinforced curing agent, keep the speed at 500-800 rpm, and continue stirring for 1 hour;

[0041] 2-iii) Add 5-30 parts aluminum hydroxide, 8-15 parts ammonium polyphosphate, 3-10 parts expanded graphite, 3-8 parts zinc phosphate, 3-12 parts hollow glass microspheres, 3-15 parts hexagonal boron nitride, and 3-10 parts silicon carbide whiskers sequentially, and disperse at a high speed of 1000-1500 rpm for 1-2 hours to ensure uniform dispersion of these fillers; and

[0042] 2-iv) Add 2-5 parts of graphene dispersion, stir at 300-400 rpm for 20 minutes, then filter through a 200-300 mesh filter to obtain a homogeneous mixture. Seal and package for later use.

[0043] 3) Mix component A and component B at a mass ratio of 100:100 to 100:50, and stir until homogeneous to obtain the explosion-proof coating.

[0044] The nano-reinforced curing agent is prepared through the following steps:

[0045] Add 50-60 parts of matrix curing agent and 15-25 parts of elastomer toughening agent to a four-necked flask, and stir at 300-400 rpm for 2 hours under nitrogen protection at 80-90℃.

[0046] Cool to 60℃, slowly add 5-10 parts of nano-reinforced filler under high-speed shear at 5000rpm, disperse at 1000rpm for 60 minutes to ensure uniform dispersion of nanoparticles without agglomeration;

[0047] Adjust the rotation speed to 300 rpm, add 10-20 parts of matrix curing agent, 1-3 parts of accelerator, 2-4 parts of aminosilane coupling agent, and 0.5-1.5 parts of molecular sieve. Stir at 70-80℃ for 1 hour to ensure thorough mixing and reaction of all components.

[0048] Stop heating and allow it to cool naturally to below 40°C. Then, discharge the material through a 400-mesh filter to obtain the nano-reinforced curing agent.

[0049] The third aspect of this application provides the application of the above-mentioned explosion-proof coating or the explosion-proof coating prepared by the above method in flame-retardant and explosion-proof products.

[0050] In some exemplary embodiments, the flame-retardant and explosion-proof product is the base, platform, support, or inner wall of a deep well casting machine.

[0051] The fourth aspect of this application provides a coating formed by the above-described explosion-proof coating or an explosion-proof coating prepared by the above method, wherein the coating is formed by applying the explosion-proof coating onto a substrate and curing it.

[0052] In some exemplary embodiments, the substrate is a flame-retardant and explosion-proof product.

[0053] In some exemplary embodiments, the flame-retardant and explosion-proof product is the base, platform, support, or inner wall of a deep well casting machine.

[0054] In this application, the overall design of component A ensures that the coating has good storage stability and application adaptability, and the functions of each component are as follows:

[0055] Epoxy resins, such as Nan Ya 128 epoxy resin (E-51), provide excellent adhesion and chemical resistance as a film-forming matrix.

[0056] Reactive diluents, such as AGE (an alkyl glycidyl ether), reduce the viscosity of the system, improve workability, and participate in the curing reaction without affecting the crosslinking strength;

[0057] Silane coupling agents, such as epoxy silane KH-560, improve the interfacial bonding force between inorganic fillers and resin matrix, and enhance coating adhesion.

[0058] Fumed silica, such as R972, acts as a thixotropic agent to prevent coating sagging and improve workability.

[0059] In this application, component B, as the core functional carrier, is divided into two parts: a nano-reinforced curing agent and a functional filler system. Synergistic effects are achieved through precise formulation.

[0060] In some exemplary embodiments, the nano-reinforced curing agent includes:

[0061] The matrix curing agent, such as a low molecular weight polyamide resin, such as polyamide 650, serves as the main curing component, providing basic curing ability, toughness, and adhesion.

[0062] Elastomer toughening agents, such as amino-terminated liquid nitrile butadiene rubber (ATBN), serve as key toughening components. The active amino groups participate in the curing process, introducing flexible segments into a three-dimensional network to absorb impact energy and achieve "in-situ toughening".

[0063] Nanoparticles, such as aminosilane-modified nano silica, serve as key reinforcing components, improving hardness, modulus, and wear resistance, and inhibiting the strength reduction that may result from the addition of toughening agents. The nanoparticles play a role in pinning, crack deflection, and reinforcement.

[0064] Accelerators, such as the phenolic amine accelerator DMP-30, accelerate the epoxy-amino reaction, lower the curing temperature, and ensure rapid and complete curing at moderate temperatures;

[0065] Aminosilane coupling agents, such as KH-550, further enhance the compatibility between the entire B component and the A component, greatly improving the wet adhesion to the metal substrate.

[0066] Molecular sieves reduce the hydrolysis of coupling agents and improve the effectiveness of modifiers.

[0067] In some exemplary embodiments, the functional filler system includes:

[0068] Flame-retardant and explosion-proof fillers: Aluminum hydroxide (ATH) decomposes at high temperatures, absorbing heat and releasing water vapor, thus playing a dual role in flame retardancy and releasing non-combustible gases. Ammonium polyphosphate (APP) catalyzes to form char under fire, creating an expanded char layer that isolates oxygen and heat. Expanded graphite rapidly expands upon contact with fire, forming a worm-like char layer, which, together with APP, forms a dense and highly efficient intumescent flame-retardant system. These three components work together to construct multiple lines of explosion protection.

[0069] Zinc phosphate, a rust-inhibiting filler, enhances the rust and corrosion resistance of the coating;

[0070] Hollow glass microspheres, lightweight thermal insulation fillers, reduce coating density, improve thermal shock resistance, and provide a certain thermal insulation effect at high temperatures;

[0071] Thermally conductive and reinforcing fillers: Hexagonal boron nitride (h-BN), with a layered structure, provides excellent thermal conductivity and electrical insulation while enhancing wear resistance. It forms a synergistic thermally conductive network with graphene for rapid heat dissipation. Silicon carbide whiskers (SiCWhiskers), with a whisker-like structure, offer excellent toughening and reinforcing effects, effectively resisting crack propagation. Graphene dispersion constructs a highly efficient thermally / electrically conductive network, aiding in heat dissipation and eliminating static electricity, preventing hydrogen deflagration.

[0072] Solvents, dispersants, and defoamers ensure uniform dispersion of fillers and stable application.

[0073] In some exemplary embodiments, the mixing mass ratio of component A to component B is set to 100:100 to 100:50, which ensures sufficient reaction and dense coating while also taking into account ease of application and curing speed. The coating can be cured at room temperature or accelerated at medium temperature and is suitable for various application methods such as spraying and brushing.

[0074] The beneficial effects of this application are reflected in:

[0075] 1) This application uses elastomer toughening agents, nano-reinforced fillers, etc. to prepare a self-made nano-reinforced curing agent, which effectively improves the impact resistance of the coating compared with the matrix curing agent;

[0076] 2) This application utilizes hexagonal boron nitride and graphene to construct a synergistic thermally conductive network for rapid heat dissipation. Silicon carbide whiskers resist crack propagation through a whisker toughening mechanism, forming a synergistic thermally conductive and reinforcing pathway. Aluminum hydroxide decomposes at high temperatures, absorbing heat and releasing water vapor. Ammonium polyphosphate and expanded graphite form an expanded carbon layer, isolating oxygen and heat, synergistically constructing multiple explosion-proof lines. The resulting coating exhibits excellent flame-retardant and explosion-proof properties.

[0077] 3) This invention innovatively proposes a composite functional system, supplemented by a self-made curing agent, to develop an explosion-proof coating that integrates toughening, flame retardancy, thermal conductivity and non-combustible gas release functions, which is of great significance for improving the safety of deep well casting.

[0078] Other features and advantages of this application will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the application. Other advantages of this application may be realized and obtained by means of the methods described in the description. Detailed Implementation

[0079] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in detail below. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be arbitrarily combined with each other.

[0080] The present invention will be further described in detail below with reference to specific examples, but these examples should not be construed as limiting the present invention.

[0081] The specifications of the raw materials used in the following examples and comparative examples, and the companies from which they were purchased, are as follows:

[0082] The epoxy resin was Nan Ya 128 epoxy resin (E51), purchased from Baling Petrochemical Co., Ltd.

[0083] The reactive diluent was alkyl glycidyl ether (AGE), purchased from Shanghai Maclean Biochemical Technology Co., Ltd.

[0084] The silane coupling agent was KH-560, purchased from Shanghai Yuanye Biotechnology Co., Ltd.

[0085] The fumed silica was R972 with a particle size of 20 nm, purchased from Aladdin Reagent (Shanghai) Co., Ltd.

[0086] The matrix curing agent is polyamide 650 with an amine value of 200±20, purchased from Beijing Jingdong Century Information Technology Co., Ltd.

[0087] The elastomer toughening agent is amino-terminated liquid nitrile butadiene rubber (ATBN) with a viscosity of 50,000 Pa·s, purchased from Shenzhen Wansuyuan Rubber & Plastics Co., Ltd.; acrylate emulsion, 50±5wt%, purchased from Nanjing Baojiarui Chemical Co., Ltd.; or maleic anhydride grafted polyolefin, purchased from Dongguan Shanyi Plastics Co., Ltd.

[0088] Aluminum hydroxide was purchased from Zibo Wuhong Import & Export Co., Ltd.

[0089] Ammonium polyphosphate, analytical grade, purchased from Zhenkunxing Industrial Supermarket (Shanghai) Co., Ltd.;

[0090] Expanded graphite, 5000 mesh, purchased from Shanghai Maclean Biochemical Technology Co., Ltd.

[0091] Zinc phosphate, analytical grade AR 99%, purchased from Guangdong Yuanfeng Chemical Reagent Co., Ltd.;

[0092] Hollow glass microspheres, 200 mesh, purchased from Lingshou County Baofeng Mica Processing Co., Ltd.

[0093] Hexagonal boron nitride, 99% purity, density 2.27 g / cm³ 3 Purchased from Gongyi Samsung Ceramic Materials Co., Ltd.

[0094] Silicon carbide whiskers, 99% purity, purchased from Lingshou County Jinyuan Mining Processing Plant;

[0095] The nano-reinforced filler was aminosilane-modified nano-silica (≥99.8%) with a particle size of 20 nm, purchased from Aladdin Reagent (Shanghai) Co., Ltd.

[0096] The accelerator was DMP-30, purchased from Xiyu Smart Supply Chain (Shanghai) Co., Ltd.

[0097] The aminosilane coupling agent was KH-550, purchased from Shanghai Yuanye Biotechnology Co., Ltd.

[0098] The molecular sieve is type 3A molecular sieve, spherical with a diameter of 1.6-2.5 mm, purchased from Beijing Jingdong Century Information Technology Co., Ltd.

[0099] Graphene dispersion with a solid content of 0.5 w / w% was purchased from Beijing Carbon Yang Technology Co., Ltd.

[0100] The solvent was xylene, analytical grade, purchased from Sinopharm Chemical Reagent Co., Ltd.

[0101] The dispersant was BYK-163, with a density of 0.99 g / ml, purchased from Shanghai Buding Chemical Co., Ltd.

[0102] The defoamer was BYK-054, purchased from Beijing Jingdong Century Information Technology Co., Ltd.

[0103] Example 1

[0104] The explosion-proof coating in this embodiment is prepared by the following method:

[0105] 1) Preparation of component A:

[0106] Add 85 parts of Nan Ya 128 epoxy resin, 7 parts of AGE, 5 parts of KH-560, and 3 parts of R972 to a container in sequence, stir at 400-600 rpm for 40 minutes, filter through a 100-mesh filter, and seal for storage.

[0107] 2) Preparation of component B:

[0108] In the dispersion vessel, first add 8 parts xylene, 0.3 parts BYK-163, and 0.2 parts BYK-054, and stir evenly at 300-500 rpm to avoid the generation of bubbles;

[0109] Slowly add 40 parts of nano-reinforced curing agent (N-EPCA), keep the speed at 500-800 rpm, and continue stirring for 1 hour;

[0110] Add 10 parts aluminum hydroxide, 13 parts ammonium polyphosphate, 5 parts expanded graphite, 5 parts zinc phosphate, 6.5 parts hollow glass microspheres, 5 parts hexagonal boron nitride, and 5 parts silicon carbide whiskers sequentially, and disperse at a high speed of 1000-1500 rpm for 1-2 hours to ensure uniform dispersion of these fillers; and

[0111] Finally, add 2 parts of 0.5 w / w% graphene dispersion, stir at low speed (300-400 rpm) for 20 minutes, filter through a 200-300 mesh filter to obtain a homogeneous mixture, and seal in packaging for later use; and

[0112] 3) Mix component A and component B at a mass ratio of 100:100 and stir until homogeneous to obtain the explosion-proof coating.

[0113] The preparation of the nano-reinforced curing agent (N-EPCA) is as follows:

[0114] 55 parts of polyamide 650 and 15 parts of ATBN were added to a four-necked flask. Under nitrogen protection, the mixture was stirred at 300-400 rpm for 2 hours at 80-90℃ to allow the terminal amino groups of ATBN to undergo a preliminary reaction with the amide groups or terminal groups in the polyamide, thus achieving pre-grafting.

[0115] Cool down to 60℃, slowly add 5 parts of aminosilane-modified nano silica under high-speed shear at 5000rpm, and disperse at 1000rpm for 60 minutes to ensure uniform dispersion of nanoparticles without agglomeration.

[0116] Adjust the rotation speed to 300 rpm, add the remaining 20 parts polyamide 650, 2 parts DMP-30, 2.5 parts KH-550, and 0.5 parts type 3A molecular sieve, and stir at 70-80℃ for 1 hour to ensure thorough mixing and reaction of all components;

[0117] Stop heating and allow it to cool naturally to below 40°C. Pass the material through a 400-mesh filter to obtain the nano-reinforced curing agent (N-EPCA). Store it in a sealed container in a cool place.

[0118] Example 2

[0119] The explosion-proof coating in this embodiment is prepared by the following method:

[0120] 1) Preparation of component A:

[0121] Add 85 parts of Nan Ya 128 epoxy resin, 7 parts of AGE, 5 parts of KH-560, and 3 parts of R972 to a container in sequence, stir at 400-600 rpm for 40 minutes, filter through a 100-mesh filter, and seal for storage.

[0122] 2) Preparation of component B:

[0123] In the dispersion vessel, first add 8 parts xylene, 0.3 parts BYK-163, and 0.2 parts BYK-054, and stir evenly at 300-500 rpm to avoid the generation of bubbles;

[0124] Slowly add 40 parts of nano-reinforced curing agent (N-EPCA), keep the speed at 500-800 rpm, and continue stirring for 1 hour;

[0125] Add 10 parts aluminum hydroxide, 13 parts ammonium polyphosphate, 5 parts expanded graphite, 5 parts zinc phosphate, 6.5 parts hollow glass microspheres, 5 parts hexagonal boron nitride, and 5 parts silicon carbide whiskers sequentially, and disperse at a high speed of 1000-1500 rpm for 1-2 hours to ensure uniform dispersion of these fillers; and

[0126] Finally, add 2 parts of 0.5 w / w% graphene dispersion, stir at low speed (300-400 rpm) for 20 minutes, filter through a 200-300 mesh filter to obtain a homogeneous mixture, and seal in packaging for later use; and

[0127] 3) Mix component A and component B at a mass ratio of 100:50 and stir until homogeneous to obtain the explosion-proof coating.

[0128] The preparation method of the nano-reinforced curing agent (N-EPCA) is the same as in Example 1.

[0129] Example 3

[0130] The explosion-proof coating in this embodiment is prepared by the following method:

[0131] 1) Preparation of component A:

[0132] Add 85 parts of Nan Ya 128 epoxy resin, 7 parts of AGE, 5 parts of KH-560, and 3 parts of R972 to a container in sequence, stir at 400-600 rpm for 40 minutes, filter through a 100-mesh filter, and seal for storage.

[0133] 2) Preparation of component B:

[0134] In the dispersion vessel, first add 5 parts xylene, 0.3 parts BYK-163, and 0.2 parts BYK-054, and stir evenly at 300-500 rpm to avoid the generation of bubbles;

[0135] Slowly add 58 parts of nano-reinforced curing agent (N-EPCA), keep the speed at 500-800 rpm, and continue stirring for 1 hour;

[0136] Add 8 parts aluminum hydroxide, 10 parts ammonium polyphosphate, 3 parts expanded graphite, 3 parts zinc phosphate, 4.5 parts hollow glass microspheres, 3 parts hexagonal boron nitride, and 3 parts silicon carbide whiskers sequentially, and disperse at a high speed of 1000-1500 rpm for 1-2 hours to ensure uniform dispersion of these fillers; and

[0137] Finally, add 2 parts of 0.5 w / w% graphene dispersion, stir at low speed (300-400 rpm) for 20 minutes, filter through a 200-300 mesh filter to obtain a homogeneous mixture, and seal in packaging for later use; and

[0138] 3) Mix component A and component B at a mass ratio of 100:50 and stir until homogeneous to obtain the explosion-proof coating.

[0139] The preparation method of the nano-reinforced curing agent (N-EPCA) is the same as in Example 1.

[0140] Example 4

[0141] The explosion-proof coating in this embodiment is prepared by the following method:

[0142] 1) Preparation of component A:

[0143] Add 85 parts of Nan Ya 128 epoxy resin, 7 parts of AGE, 5 parts of KH-560, and 3 parts of R972 to a container in sequence, stir at 400-600 rpm for 40 minutes, filter through a 100-mesh filter, and seal for storage.

[0144] 2) Preparation of component B:

[0145] In the dispersion vessel, first add 8 parts xylene, 0.3 parts BYK-163, and 0.2 parts BYK-054, and stir evenly at 300-500 rpm to avoid the generation of bubbles;

[0146] Slowly add 30 parts of nano-reinforced curing agent (N-EPCA), keep the speed at 500-800 rpm, and continue stirring for 1 hour;

[0147] Add 13 parts aluminum hydroxide, 15 parts ammonium polyphosphate, 7 parts expanded graphite, 5 parts zinc phosphate, 7.5 parts hollow glass microspheres, 6 parts hexagonal boron nitride, and 6 parts silicon carbide whiskers sequentially, and disperse at a high speed of 1000-1500 rpm for 1-2 hours to ensure uniform dispersion of these fillers; and

[0148] Finally, add 2 parts of 0.5 w / w% graphene dispersion, stir at low speed (300-400 rpm) for 20 minutes, filter through a 200-300 mesh filter to obtain a homogeneous mixture, and seal in packaging for later use; and

[0149] 3) Mix component A and component B at a mass ratio of 100:50 and stir until homogeneous to obtain the explosion-proof coating.

[0150] The preparation method of the nano-reinforced curing agent (N-EPCA) is the same as in Example 1.

[0151] Example 5

[0152] The explosion-proof coating in this embodiment is prepared by the following method:

[0153] 1) Preparation of component A:

[0154] Add 85 parts of Nan Ya 128 epoxy resin, 7 parts of AGE, 5 parts of KH-560, and 3 parts of R972 to a container in sequence, stir at 400-600 rpm for 40 minutes, filter through a 100-mesh filter, and seal for storage.

[0155] 2) Preparation of component B:

[0156] In the dispersion vessel, first add 8 parts xylene, 0.3 parts BYK-163, and 0.2 parts BYK-054, and stir evenly at 300-500 rpm to avoid the generation of bubbles;

[0157] Slowly add 40 parts of nano-reinforced curing agent (N-EPCA), keep the speed at 500-800 rpm, and continue stirring for 1 hour;

[0158] Add 10 parts aluminum hydroxide, 13 parts ammonium polyphosphate, 5 parts expanded graphite, 5 parts zinc phosphate, 6.5 parts hollow glass microspheres, 5 parts hexagonal boron nitride, and 5 parts silicon carbide whiskers sequentially, and disperse at a high speed of 1000-1500 rpm for 1-2 hours to ensure uniform dispersion of these fillers; and

[0159] Finally, add 2 parts of 0.5 w / w% graphene dispersion, stir at low speed (300-400 rpm) for 20 minutes, filter through a 200-300 mesh filter to obtain a homogeneous mixture, and seal in packaging for later use; and

[0160] 3) Mix component A and component B at a mass ratio of 100:50 and stir until homogeneous to obtain the explosion-proof coating.

[0161] The preparation of the nano-reinforced curing agent (N-EPCA) is as follows:

[0162] 55 parts of polyamide 650 and 15 parts of acrylate emulsion were added to a four-necked flask. Under nitrogen protection, the mixture was stirred at 300-400 rpm for 2 hours at 80-90°C to allow the carboxyl and hydroxyl groups of the acrylate emulsion to undergo a preliminary reaction with the amide or terminal groups in the polyamide, thus achieving pre-grafting. The remaining steps were prepared in the same manner as in Example 1.

[0163] Example 6

[0164] The explosion-proof coating in this embodiment is prepared by the following method:

[0165] 1) Preparation of component A:

[0166] Add 85 parts of Nan Ya 128 epoxy resin, 7 parts of AGE, 5 parts of KH-560, and 3 parts of R972 to a container in sequence, stir at 400-600 rpm for 40 minutes, filter through a 100-mesh filter, and seal for storage.

[0167] 2) Preparation of component B:

[0168] In the dispersion vessel, first add 8 parts xylene, 0.3 parts BYK-163, and 0.2 parts BYK-054, and stir evenly at 300-500 rpm to avoid the generation of bubbles;

[0169] Slowly add 40 parts of nano-reinforced curing agent (N-EPCA), keep the speed at 500-800 rpm, and continue stirring for 1 hour;

[0170] Add 10 parts aluminum hydroxide, 13 parts ammonium polyphosphate, 5 parts expanded graphite, 5 parts zinc phosphate, 6.5 parts hollow glass microspheres, 5 parts hexagonal boron nitride, and 5 parts silicon carbide whiskers sequentially, and disperse at a high speed of 1000-1500 rpm for 1-2 hours to ensure uniform dispersion of these fillers; and

[0171] Finally, add 2 parts of 0.5 w / w% graphene dispersion, stir at low speed (300-400 rpm) for 20 minutes, filter through a 200-300 mesh filter to obtain a homogeneous mixture, and seal in packaging for later use; and

[0172] 3) Mix component A and component B at a mass ratio of 100:50 and stir until homogeneous to obtain the explosion-proof coating.

[0173] The preparation of the nano-reinforced curing agent (N-EPCA) is as follows:

[0174] 55 parts of polyamide 650 and 15 parts of maleic anhydride-grafted polyolefin (POE-g-MAH) were added to a four-necked flask. Under nitrogen protection, the mixture was stirred at 300-400 rpm for 2 hours at 80-90°C to allow the maleic anhydride groups in the maleic anhydride-grafted polyolefin to undergo a preliminary reaction with the amide groups or terminal groups in the polyamide, thus achieving pre-grafting. The remaining preparation steps were the same as in Example 1.

[0175] Comparative Example 1

[0176] The coatings in this comparative example were prepared by the following method:

[0177] 1) Preparation of component A:

[0178] Add 85 parts of Nan Ya 128 epoxy resin, 7 parts of AGE, 5 parts of KH-560, and 3 parts of R972 to a container in sequence, stir at 400-600 rpm for 40 minutes, filter through a 100-mesh filter, and seal for storage.

[0179] 2) Preparation of component B:

[0180] In a dispersion vessel, first add 8 parts xylene, 0.3 parts BYK-163, and 0.2 parts BYK-054, and stir evenly at 300-500 rpm to avoid the formation of bubbles; slowly add 40 parts polyamide 650, maintaining the speed at 500-800 rpm, and continue stirring for 1 hour. Filter through a 200-300 mesh filter to obtain a homogeneous mixture, and seal it for later use.

[0181] 3) Mix component A and component B at a mass ratio of 100:50 and stir until homogeneous to obtain the coating.

[0182] Comparative Example 2

[0183] The coatings in this comparative example were prepared by the following method:

[0184] 1) Preparation of component A:

[0185] Add 85 parts of Nan Ya 128 epoxy resin, 7 parts of AGE, 5 parts of KH-560, and 3 parts of R972 to a container in sequence, stir at 400-600 rpm for 40 minutes, filter through a 100-mesh filter, and seal for storage.

[0186] 2) Preparation of component B:

[0187] In the dispersion vessel, first add 8 parts xylene, 0.3 parts BYK-163, and 0.2 parts BYK-054, and stir evenly at 300-500 rpm to avoid the generation of bubbles;

[0188] Slowly add 40 parts of polyamide 650, maintaining a speed of 500-800 rpm, and continue stirring for 1 hour;

[0189] Add 10 parts aluminum hydroxide, 13 parts ammonium polyphosphate, 5 parts expanded graphite, 5 parts zinc phosphate, 6.5 parts hollow glass microspheres, 5 parts hexagonal boron nitride, and 5 parts silicon carbide whiskers sequentially, and disperse at a high speed of 1000-1500 rpm for 1-2 hours to ensure uniform dispersion of these fillers; and

[0190] Finally, add 2 parts of 0.5 w / w% graphene dispersion, stir at low speed (300-400 rpm) for 20 minutes, filter through a 200-300 mesh filter to obtain a homogeneous mixture, and seal in packaging for later use; and

[0191] 3) Mix component A and component B at a mass ratio of 100:50 and stir until homogeneous to obtain the coating.

[0192] Comparative Example 3

[0193] The coatings in this comparative example were prepared by the following method:

[0194] 1) Preparation of component A:

[0195] Add 85 parts of Nan Ya 128 epoxy resin, 7 parts of AGE, 5 parts of KH-560, and 3 parts of R972 to a container in sequence, stir at 400-600 rpm for 40 minutes, filter through a 100-mesh filter, and seal for storage.

[0196] 2) Preparation of component B:

[0197] In a dispersion vessel, first add 8 parts xylene, 0.3 parts BYK-163, and 0.2 parts BYK-054, and stir evenly at 300-500 rpm to avoid bubble formation; slowly add 40 parts of the nano-reinforced curing agent (N-EPCA) prepared in Example 1, maintaining the stirring speed at 500-800 rpm, and continue stirring for 1 hour. Filter through a 200-300 mesh screen to obtain a homogeneous mixture, and seal and package for later use; and

[0198] 3) Mix component A and component B at a mass ratio of 100:50 and stir until homogeneous to obtain the coating.

[0199] Comparative Example 4

[0200] 1) Preparation of component A:

[0201] Add 85 parts of Nan Ya 128 epoxy resin, 7 parts of AGE, 5 parts of KH-560, and 3 parts of R972 to a container in sequence, stir at 400-600 rpm for 40 minutes, filter through a 100-mesh filter, and seal for storage.

[0202] 2) Preparation of component B:

[0203] In the dispersion vessel, first add 8 parts xylene, 0.3 parts BYK-163, and 0.2 parts BYK-054, and stir evenly at 300-500 rpm to avoid the generation of bubbles;

[0204] Slowly add 40 parts of polyamide 650, maintaining a speed of 500-800 rpm, and continue stirring for 1 hour;

[0205] Add 10 parts aluminum hydroxide, 5 parts zinc phosphate, 6.5 parts hollow glass microspheres, 5 parts hexagonal boron nitride, and 5 parts silicon carbide whiskers sequentially, and disperse at a high speed of 1000-1500 rpm for 1-2 hours to ensure uniform dispersion of these fillers; and

[0206] Finally, add 2 parts of 0.5 w / w% graphene dispersion, stir at low speed (300-400 rpm) for 20 minutes, filter through a 200-300 mesh filter to obtain a homogeneous mixture, and seal in packaging for later use; and

[0207] 3) Mix component A and component B at a mass ratio of 100:50 and stir until homogeneous to obtain the coating.

[0208] Comparative Example 5

[0209] 1) Preparation of component A:

[0210] Add 85 parts of Nan Ya 128 epoxy resin, 7 parts of AGE, 5 parts of KH-560, and 3 parts of R972 to a container in sequence, stir at 400-600 rpm for 40 minutes, filter through a 100-mesh filter, and seal for storage.

[0211] 2) Preparation of component B:

[0212] In the dispersion vessel, first add 8 parts xylene, 0.3 parts BYK-163, and 0.2 parts BYK-054, and stir evenly at 300-500 rpm to avoid the generation of bubbles;

[0213] Slowly add 40 parts of polyamide 650, maintaining a speed of 500-800 rpm, and continue stirring for 1 hour;

[0214] Add 10 parts aluminum hydroxide, 13 parts ammonium polyphosphate, 5 parts expanded graphite, 5 parts zinc phosphate, and 6.5 parts hollow glass microspheres sequentially. Disperse at a high speed of 1000-1500 rpm for 1-2 hours to ensure uniform dispersion. Filter through a 200-300 mesh filter to obtain a homogeneous mixture, then seal and package for later use.

[0215] 3) Mix component A and component B at a mass ratio of 100:50 and stir until homogeneous to obtain the coating.

[0216] The coatings prepared in Examples 1-6 and Comparative Examples 1-5 can be cured at room temperature for 24 hours or at 80°C for 2 hours by spraying, brushing, or other methods to obtain a paint film.

[0217] Performance Tests and Results

[0218] According to the method of GB / T 42259-2022, the morphology and cracking / peeling of the paint film after one high-temperature thermal shock were determined. The results are shown in Table 1. After a thermal shock at 1200℃ for 15 seconds, the surfaces of the examples and comparative examples were observed. All examples did not burn during the thermal shock process, and no cracks appeared on the surface after the heat source was removed. Comparative Examples 1 and 3-5 showed burning phenomena, and cracks appeared on the surfaces of Comparative Examples 1-5. This is because epoxy resin is relatively flammable. Adding functional fillers can effectively inhibit the combustion of the coating. The lack of some fillers (e.g., the lack of ammonium polyphosphate and expanded graphite in Comparative Example 4) can also lead to the combustion of the coating. Therefore, the coating described in this invention has excellent explosion-proof performance.

[0219] The fire resistance times of Examples 1-6 and Comparative Examples 1-5 were tested according to the method in GB / T 15442.2-1995. The tests showed that the fire resistance times of Examples 1-6 were 31.0-34.1 min; while the fire resistance times of Comparative Examples 1 and 3 were less than 5 min, Comparative Example 2 was only 26.4 min, and the fire resistance times of Comparative Examples 4 and 5 were 11.0 min and 8.9 min, respectively. Therefore, the coating described in this invention has excellent flame-retardant properties.

[0220] The adhesion of the coating film was determined according to the method of GB / T 1720-2020; the impact resistance of the coating film was determined according to the method of GB / T 1732-2020. Except for Comparative Examples 1, 2, 4, and 5, the other examples and comparative examples showed good impact resistance. The poor impact resistance was due to insufficient cross-linking of the epoxy coating after the addition of functional fillers. The nano-reinforced curing agent prepared using this invention can effectively improve the impact resistance of the coating.

[0221] Table 1. Performance comparison of coatings in Examples 1-6 and Comparative Examples 1-5

[0222]

[0223] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. An explosion-proof coating, characterized in that, The explosion-proof coating is composed of component A and component B, wherein the mass ratio of component A to component B is 100:100 to 100:50; wherein: Component A, by weight, comprises: 70-90 parts epoxy resin, 3-8 parts reactive diluent, 2-6 parts silane coupling agent, and 0.5-3 parts fumed silica. Component B, by weight, comprises: 30-60 parts of nano-reinforced curing agent, 5-30 parts of aluminum hydroxide, 8-15 parts of ammonium polyphosphate, 3-10 parts of expanded graphite, 3-8 parts of zinc phosphate, 3-12 parts of hollow glass microspheres, 3-15 parts of hexagonal boron nitride, 3-10 parts of silicon carbide whiskers, 2-5 parts of graphene dispersion, 5-10 parts of solvent, 0.2-1.5 parts of dispersant, and 0.1-1 parts of defoamer; The nano-reinforced curing agent, by weight, comprises: 60-80 parts matrix curing agent, 15-25 parts elastomer toughening agent, 5-10 parts nano-reinforced filler, 1-3 parts accelerator, 2-4 parts aminosilane coupling agent, and 0.5-1.5 parts molecular sieve. In the nano-reinforced curing agent, The matrix curing agent is a low molecular weight polyamide resin with a number average molecular weight of 500-2000 g / mol; The elastomer toughening agent is an amino-terminated liquid nitrile rubber (ATBN), an acrylate emulsion, or a maleic anhydride-grafted polyolefin. The nano-reinforced filler is aminosilane-modified nano-silica or silicate clay; The accelerator is a phenolic amine accelerator; The aminosilane coupling agent is KH-550 or KH902; The molecular sieve is a type 3A molecular sieve.

2. The explosion-proof coating according to claim 1, characterized in that, In the nano-reinforced curing agent The matrix curing agent is polyamide 650 with an amine value of 200 ± 20; type 203 polyamide with an amine value of 200 ± 20; or type 200 polyamide with an amine value of 215 ± 15. The elastomer toughening agent is amino-terminated liquid butadiene nitrile rubber (ATBN). The nano-reinforced filler is aminosilane-modified nano-silica with a particle size of 20 nm, or bentonite or montmorillonite with a particle size of 20-200 nm. The accelerator is DMP-30; The aminosilane coupling agent is KH-550.

3. The explosion-proof coating according to claim 2, characterized in that, In the nano-reinforced curing agent The matrix curing agent is polyamide 650 with an amine value of 200 ± 20; The nano-reinforced filler is aminosilane-modified nano-silica with a particle size of 20 nm.

4. The explosion-proof coating according to any one of claims 1-3, characterized in that, In the explosion-proof coating The epoxy resin is E42, E44, E51 or E54; The active diluent is a glycidyl ether; The silane coupling agent is an epoxy silane; The fumed silica is hydrophobic fumed silica; The solvent is xylene; The dispersant is BYK-163; The defoamer is BYK-054; The solid content of the graphene dispersion is 0.5 w / w.

5. The explosion-proof coating according to claim 4, characterized in that, In the explosion-proof coating The epoxy resin is E51; The reactive diluent is C. 12 -C 14 One or more of alkyl glycidyl ether, phenyl glycidyl ether, propenyl glycidyl ether, o-cresol glycidyl ether, and 1,4-butanediol diglycidyl ether; The silane coupling agent is KH-560, KH-563 or KH-567; The fumed silica is R972.

6. The explosion-proof coating according to claim 5, characterized in that, In the explosion-proof coating The reactive diluent is C. 12 -C 14 Alkyl glycidyl ethers; The silane coupling agent is KH-560.

7. A method for preparing an explosion-proof coating according to any one of claims 1-6, characterized in that, Includes the following steps: 1) Preparation of component A: Add 70-90 parts epoxy resin, 3-8 parts reactive diluent, 2-6 parts silane coupling agent, and 0.5-3 parts fumed silica into a container in sequence, stir evenly, filter, seal and store for later use. 2) Preparation of component B: 2-i) In a dispersion vessel, add 5-10 parts solvent, 0.2-1.5 parts dispersant, and 0.1-1 parts defoamer, and stir until homogeneous; 2-ii) Slowly add 30-60 parts of nano-reinforced curing agent and stir until homogeneous; 2-iii) Add 5-30 parts aluminum hydroxide, 8-15 parts ammonium polyphosphate, 3-10 parts expanded graphite, 3-8 parts zinc phosphate, 3-12 parts hollow glass microspheres, 3-15 parts hexagonal boron nitride, and 3-10 parts silicon carbide whiskers in sequence, and continue stirring to ensure that these fillers are evenly dispersed. and 2-iv) Add 2-5 parts of graphene dispersion, stir until homogeneous, filter to obtain a homogeneous mixture, and seal in packaging for later use; and 3) Mix component A and component B at a mass ratio of 100:100 to 100:50, and stir until homogeneous to obtain the explosion-proof coating. The nano-reinforced curing agent is prepared through the following steps: Add 50-60 parts of matrix curing agent and 15-25 parts of elastomer toughening agent to a four-necked flask, and stir at 80-90℃ under nitrogen protection to allow the reaction to proceed. Cool down to 60℃, slowly add 5-10 parts of nano-reinforced filler under high-speed shear at 5000rpm, and disperse at 1000rpm to ensure uniform dispersion of nanoparticles without agglomeration; Adjust the rotation speed to 300 rpm, add 10-20 parts of matrix curing agent, 1-3 parts of accelerator, 2-4 parts of aminosilane coupling agent, and 0.5-1.5 parts of molecular sieve. Continue stirring at 70-80℃ to ensure thorough mixing and reaction of all components. Stop heating and allow it to cool naturally to below 40°C. Filter to obtain the nano-reinforced curing agent.

8. The method according to claim 7, characterized in that, Includes the following steps: 1) Preparation of component A: Add 70-90 parts epoxy resin, 3-8 parts reactive diluent, 2-6 parts silane coupling agent, and 0.5-3 parts fumed silica into a container in sequence, stir at 400-600 rpm for 40 minutes, filter through a 100-mesh filter, and seal for storage. 2) Preparation of component B: 2-i) In a dispersion vessel, add 5-10 parts solvent, 0.2-1.5 parts dispersant, and 0.1-1 parts defoamer, and stir evenly at 300-500 rpm to avoid the generation of bubbles; 2-ii) Slowly add 30-60 parts of nano-reinforced curing agent, keep the speed at 500-800 rpm, and continue stirring for 1 hour; 2-iii) Add 5-30 parts aluminum hydroxide, 8-15 parts ammonium polyphosphate, 3-10 parts expanded graphite, 3-8 parts zinc phosphate, 3-12 parts hollow glass microspheres, 3-15 parts hexagonal boron nitride, and 3-10 parts silicon carbide whiskers in sequence, and disperse at a high speed of 1000-1500 rpm for 1-2 hours to ensure that these fillers are uniformly dispersed; and 2-iv) Add 2-5 parts of graphene dispersion, stir at 300-400 rpm for 20 minutes, then filter through a 200-300 mesh filter to obtain a homogeneous mixture. Seal and package for later use. 3) Mix component A and component B at a mass ratio of 100:100 to 100:50, and stir until homogeneous to obtain the explosion-proof coating. The nano-reinforced curing agent is prepared through the following steps: Add 50-60 parts of matrix curing agent and 15-25 parts of elastomer toughening agent to a four-necked flask, and stir at 300-400 rpm for 2 hours under nitrogen protection at 80-90℃. Cool to 60℃, slowly add 5-10 parts of nano-reinforced filler under high-speed shear at 5000rpm, disperse at 1000rpm for 60 minutes to ensure uniform dispersion of nanoparticles without agglomeration; Adjust the rotation speed to 300 rpm, add 10-20 parts of matrix curing agent, 1-3 parts of accelerator, 2-4 parts of aminosilane coupling agent, and 0.5-1.5 parts of molecular sieve. Stir at 70-80℃ for 1 hour to ensure thorough mixing and reaction of all components. Stop heating and allow it to cool naturally to below 40°C. Then, discharge the material through a 400-mesh filter to obtain the nano-reinforced curing agent.

9. The application of the explosion-proof coating according to any one of claims 1-6 or the explosion-proof coating prepared according to the method of claim 7 or 8 in flame-retardant and explosion-proof products, wherein the flame-retardant and explosion-proof products are the base, platform, support or inner wall of a deep well casting machine.

10. A coating formed by the explosion-proof coating according to any one of claims 1-6 or the explosion-proof coating prepared according to the method of claim 7 or 8, wherein the coating is formed by applying the explosion-proof coating onto a substrate and curing it, and the substrate is a flame-retardant and explosion-proof product.

11. The coating according to claim 10, wherein the flame-retardant and explosion-proof product is the base, platform, support, or inner wall of a deep well casting machine.

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