High-temperature-resistant anticorrosive paint and preparation method thereof

Abstract

The application discloses a high-temperature-resistant anticorrosive paint and a preparation method thereof, and relates to the technical field of paints. The high-temperature-resistant anticorrosive paint is composed of a main agent and a curing agent, and the mass ratio of the main agent to the curing agent is (7-10):1. The main agent comprises the following components in parts by weight: 35-40 parts of epoxy resin, 10-15 parts of hyperbranched polyborosiloxane containing an epoxy group, 30-35 parts of functional filler, 3-5 parts of other functional additives, 3-5 parts of rare earth oxide, 3-5 parts of diluent, 0.3-0.5 parts of bentonite and 0.8-1 part of wax paste. The curing agent is at least one of 2636 epoxy curing agent, 3,3'-diamino-4,4'-difluorodiphenyl sulfone, phenyl melamine and 9,9-bis(4-aminophenyl)fluorene. The paint has better high-temperature resistance, more excellent corrosion resistance, stronger adhesion and better environmental protection.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of coating technology, in particular to a high-temperature-resistant anticorrosive coating and a preparation method thereof. BACKGROUND

[0002] In the fields of aerospace, petrochemical industry, metallurgy and power, various equipment (such as engine parts, reaction kettles, furnace pipes, etc.) are long-term exposed to harsh environments where high temperature and corrosive media (such as acid, alkali, salt spray, high-temperature oxidation atmosphere) coexist. Surface protection of the equipment becomes the key to guaranteeing the service life and safe operation of the equipment. High-temperature-resistant anticorrosive coating, as an efficient and economical surface protection material, forms a dense protective film on the surface of the substrate, thereby isolating the high-temperature oxidation and corrosion medium, and prolonging the service life of the equipment.

[0003] Traditional high-temperature-resistant anticorrosive coatings are mainly divided into organic coatings and inorganic coatings. Organic coatings (such as silicone and polyimide) have good flexibility and adhesion, but their long-term high-temperature resistance is limited, and they are prone to thermal oxidative degradation at high temperatures, leading to cracking and peeling of the coating, and a sharp decline in corrosion resistance. Inorganic coatings (such as ceramic-based and metal-based coatings) have excellent high-temperature resistance, but they have poor flexibility, weak adhesion to the substrate, and high construction difficulty. In this situation, organic-inorganic composite coatings have emerged, which can better balance high-temperature resistance and corrosion resistance, and have attracted widespread attention in the industry.

[0004] Existing organic-inorganic composite coatings generally have poor compatibility and uneven dispersion of inorganic fillers and organic phases, resulting in the formation of pores and defects in the coating, which become the penetration channels for oxidation media and corrosion ions at high temperatures, significantly reducing the high-temperature corrosion resistance and service life of the coating. In addition, the antioxidants in these coatings are mainly traditional organic antioxidants (such as hindered phenolic antioxidants), which are prone to volatilization and failure at high temperatures, and cannot inhibit the thermal oxidative degradation of the coating for a long time. The corrosion inhibitors are mainly single components (such as zinc powder and chromate), and the corrosion mechanism is single, which is difficult to cope with complex high-temperature corrosion environments.

[0005] To solve the above problems, the existing technology CN113717637B provides a high-temperature-resistant anticorrosive coating and a preparation method thereof, which is prepared from the following components in the following mass fractions: flexible fast-drying resin 5-10 parts, A silicone resin 10-30 parts, B silicone resin 10-20 parts, aluminum silver paste 10-30 parts, filler 10-20 parts, composite environmentally friendly solvent 10-20 parts, catalyst 0.2-1 part, rheological additive 0.5-1 part, and dispersant 0.2-0.5 part. The high-temperature-resistant anticorrosive coating of the invention is a single-component, which does not require pre-baking, and has excellent adhesion and salt spray resistance after being subjected to 600℃ high temperature for 6h, and has long-term corrosion resistance. However, there is still room for improvement in terms of heat cycle resistance, complex medium corrosion resistance, construction adaptability, and environmental friendliness.

[0006] It can be seen that it is necessary to seek a more effective method to prepare a high-temperature-resistant anticorrosive coating with better high-temperature-resistant performance, more excellent corrosion-resistant performance, stronger adhesion and better environmental protection. SUMMARY

[0007] The present application aims to overcome the deficiencies in the prior art and provide a high-temperature-resistant anticorrosive coating with better high-temperature-resistant performance, more excellent corrosion-resistant performance, stronger adhesion and better environmental protection, and a preparation method thereof.

[0008] To achieve the above-mentioned purposes, the technical scheme adopted by the present application is: a high-temperature-resistant anticorrosive coating, which is composed of a main agent and a curing agent; the mass ratio of the main agent to the curing agent is (7-10):1; the main agent comprises the following components by weight: 35-40 parts of epoxy resin, 10-15 parts of epoxy group-containing hyperbranched polyborosiloxane, 30-35 parts of functional filler, 3-5 parts of other functional additives, 3-5 parts of rare earth oxide, 3-5 parts of diluent, 0.3-0.5 parts of bentonite and 0.8-1 part of wax paste; the curing agent is at least one of 2636 epoxy curing agent, 3,3'-diamino-4,4'-difluorodiphenyl sulfone, phenyl melamine and 9,9-bis(4-aminophenyl)fluorene.

[0009] Preferably, the epoxy resin is of SM618 type, with an epoxy equivalent weight of 184-200 g / eq and a viscosity of 10000-25000 mpa·s at 25 DEG C, which is provided by Jiangsu Sanmu.

[0010] Preferably, the epoxy group-containing hyperbranched polyborosiloxane has no special requirements for its source, and in an embodiment of the present application, the epoxy group-containing hyperbranched polyborosiloxane is prepared according to the preparation method of the hyperbranched polyborosiloxane in patent document CN107868252B, example 1.

[0011] Preferably, the functional filler is compounded from silicon powder, graphene nanosheet and silicon nitride at a mass ratio of (3-5):(0.5-0.8):0.5.

[0012] Preferably, the silicon powder is silicon powder GSF-2.

[0013] Preferably, the graphene nanosheet has a sheet diameter of 1-10 mu m, a thickness of 2-3 nm and a D50 particle size of 5 mu m.

[0014] Preferably, the silicon nitride has an average particle size of 20-60 nm.

[0015] Preferably, the other functional additives are compounded from coupling agent, dispersant, defoaming agent, corrosion inhibitor at a mass ratio of (3-5):(0.8-1.2):1:(1-2).

[0016] Preferably, the coupling agent is at least one of silane coupling agent KH550, silane coupling agent KH560 and silane coupling agent KH570.

[0017] Preferably, the dispersant is super dispersant Tech-6320, and the defoaming agent is defoaming agent Defom 6800.

[0018] Preferably, the corrosion inhibitor is zinc molybdate and aluminum tripolyphosphate compounded in a mass ratio of 2:3.

[0019] Preferably, the rare earth oxide is at least one of cerium oxide and yttrium oxide.

[0020] Preferably, the average particle size of the rare earth oxide is 60-100 nm.

[0021] Preferably, the diluent is compounded from Ultra LITE 2020 and diluent MD-2013 in a mass ratio of 1:3.

[0022] Preferably, the bentonite is HFGEL-140, and the wax paste is 3300 polyamide wax dispersion.

[0023] Preferably, the curing agent is compounded from 2636 epoxy curing agent, 3,3'-diamino-4,4'-difluorodiphenyl sulfone, benzoguanamine and 9,9-bis(4-aminophenyl)fluorene in a mass ratio of 1:1:0.5:0.3.

[0024] Another object of the present application is to provide a preparation method of the high-temperature-resistant anticorrosive paint, which comprises the following steps: adding each component of a main agent into a mixing container, stirring to be uniform for standby; adding a curing agent into the mixing container, stirring to be uniform for standby; mixing and stirring the main agent and the curing agent in a proportion to be uniform, thereby obtaining the high-temperature-resistant anticorrosive paint.

[0025] Due to the use of the above technical solution, the present application has the following beneficial effects:

[0026] (1) The high-temperature-resistant anticorrosive paint disclosed by the application is composed of a main agent and a curing agent, and the mass ratio of the main agent to the curing agent is (7-10):1; the main agent comprises the following components in parts by weight: 35-40 parts of epoxy resin, 10-15 parts of hyperbranched polyborosiloxane containing epoxy groups, 30-35 parts of functional filler, 3-5 parts of other functional additives, 3-5 parts of rare earth oxide, 3-5 parts of diluent, 0.3-0.5 parts of bentonite and 0.8-1 part of wax paste; the curing agent is at least one of 2636 epoxy curing agent, 3,3'-diamino-4,4'-difluorodiphenyl sulfone, phenyl melamine and 9,9-bis(4-aminophenyl) fluorene. Through mutual cooperation and joint action of the components, the prepared paint has better high-temperature resistance, more excellent corrosion resistance, stronger adhesion and better environmental protection.

[0027] (2) The high-temperature-resistant anticorrosive paint disclosed by the application selects epoxy resin and hyperbranched polyborosiloxane containing epoxy groups as the resin matrix. The epoxy resin itself has good adhesion, mechanical properties and chemical stability, and can provide a solid foundation for the coating; and the hyperbranched polyborosiloxane containing epoxy groups, with its unique hyperbranched structure and polyborosiloxane segment, not only greatly improves the high-temperature resistance of the coating, so that the coating can maintain a stable structure at high temperature, but also improves the compatibility with inorganic fillers and inhibits the corrosion failure caused by structural degradation at high temperature. The combination of the two fundamentally solves the problem of poor compatibility and uneven dispersion of inorganic fillers and organic phases in traditional coatings, effectively reduces the formation of internal pores and defects in the coating, significantly enhances the density and integrity of the coating, and improves the corrosion resistance.

[0028] (3) The high-temperature-resistant anticorrosive paint disclosed by the application, the functional filler is silicon powder, graphene nanosheet, silicon nitride, and is compounded in a mass ratio of (3-5):(0.5-0.8):0.5. The silicon powder has high hardness, low expansion coefficient and good chemical stability, which can enhance the mechanical strength and heat resistance of the coating; the graphene nanosheet forms a dense barrier network in the coating due to its excellent barrier performance, ultra-high strength and good electrical conductivity, effectively blocking the penetration of oxidizing media and corrosion ions; the silicon nitride further improves the comprehensive performance of the coating due to its high hardness, high temperature resistance and wear resistance. The three components cooperate with each other, so that the coating has been significantly improved in high-temperature resistance, corrosion resistance and mechanical properties, far exceeding the effect of single filler or ordinary filler combination.

[0029] (4) The high-temperature-resistant anticorrosive paint disclosed by the application aims at the core technical problems of traditional high-temperature-resistant anticorrosive paint, such as insufficient long-term high-temperature stability, weak adhesion to the base material, and short anticorrosion life under complex medium, and adopts 2636 epoxy curing agent, 3,3'-diamino-4,4'-difluorobenzophenone, benzotriazine, and 9,9-bis(4-aminophenyl) fluorene in a mass ratio of 1:1:0.5:0.3 to form a special curing system, and the components synergize to break through the problem precisely. The core mechanism of the compounding system is to utilize the active hydrogen atoms contained in the multiple components to fully crosslink with the epoxy groups in the epoxy resin and the hyperbranched polysiloxane containing epoxy groups, so as to build a three-dimensional network structure with compactness, heat resistance and flexibility, and fundamentally improve the protective performance of the coating. In view of the problem of easy degradation of traditional paint at high temperature, 3,3'-diamino-4,4'-difluorobenzophenone in the compounding system forms a synergistic effect with the Si-O and B-O high-energy chain segments of polysiloxane due to its fluorine-containing aromatic structure, significantly improves the thermal stability of the crosslinked network, inhibits the thermal oxidative degradation at high temperature, and solves the problem that a single curing agent cannot simultaneously consider room temperature curing and high-temperature stability. In view of the pain points of poor flexibility of inorganic paint and easy cracking of organic paint at high temperature, the rigid fluorene ring and flexible amino chain segment of 9,9-bis(4-aminophenyl) fluorene optimize the rigid-flexible balance of the network structure, so that the coating can adapt to the thermal expansion and contraction of the base material at high temperature, avoid cracking and falling off caused by stress concentration, and its aromatic structure enhances the adhesion to the resin matrix and improves the adhesion. In view of the problem of corrosion medium penetration caused by the insufficient compactness of the coating, 2636 epoxy curing agent provides high-efficiency curing activity to ensure that the crosslinking reaction proceeds fully and reduces the pores caused by the residual unreacted groups; benzotriazine further densifies the network structure through multi-functional group crosslinking, and improves the surface hardness and wear resistance of the coating, resists the damage of external erosion to the coating, and blocks the physical channel of the corrosion medium invasion. In addition, the compounding system forms good synergy with functional fillers, rare earth oxides and other components, the inorganic fillers are firmly anchored through the perfect crosslinked network, the gaps at the interface between the fillers and the resin are avoided, the dispersion uniformity of the rare earth oxides in the coating is enhanced, and the catalytic and corrosion inhibition effects are fully exerted.

[0030] (5) The high-temperature-resistant anticorrosive paint disclosed by the application, the rare earth oxide has a unique electronic structure and chemical activity, which can reduce the activation energy of the oxidation reaction, and has a catalytic and corrosion inhibition effect. In a high-temperature environment, the rare earth oxides such as cerium oxide and yttrium oxide can inhibit the oxidation process and slow down the thermal oxidative degradation rate of the coating, thereby improving the high-temperature resistance of the coating. After the addition, the rare earth oxide cooperates with other components in the paint to endow the product with excellent high-temperature resistance and corrosion resistance.

[0031] (6) The high-temperature-resistant anticorrosive paint disclosed by the application contains the hyperbranched polyborosiloxane containing an epoxy group, which can effectively improve the high-temperature-resistant performance of the paint and improve the anticorrosive performance of the paint. The prior art only discloses the high-temperature-resistant performance of the paint, but does not disclose the anticorrosive performance of the paint, and does not disclose the application of the paint in the composition of the application to prepare the high-temperature-resistant anticorrosive paint. When the hyperbranched polyborosiloxane containing an epoxy group is used in the paint, the compatibility of the hyperbranched polyborosiloxane containing an epoxy group with other components is highlighted. The application breaks through the core obstacle by reasonable selection of the composition of the formula, and has the advantages of better high-temperature-resistant performance, more excellent anticorrosive performance and stronger adhesion. On the other hand, the application uses a solvent-free system, reduces the influence of organic solvents on the environment, and has better environmental protection. DETAILED DESCRIPTION

[0032] The following description is used to disclose the application so that those skilled in the art can implement the application. The preferred embodiments in the following description are only used as examples, and other obvious modifications can be thought of by those skilled in the art.

[0033] Example 1: A high-temperature-resistant anticorrosive paint is composed of two parts of a main agent and a curing agent; the mass ratio of the main agent to the curing agent is 10:1; the main agent contains the following components by weight parts: epoxy resin 40 parts, hyperbranched polyborosiloxane containing an epoxy group 10 parts, functional filler 30 parts, other functional additives 3 parts, rare earth oxide 3 parts, diluent 3 parts, bentonite 0.3 parts, and wax paste 0.8 parts.

[0034] The epoxy resin is SM618, with an epoxy equivalent weight of 184-200 g / eq and a viscosity of 10000-25000 mpa·s at 25℃, provided by Jiangsu Sanmu; the epoxy-containing hyperbranched polyborosiloxane is prepared according to the method for preparing a hyperbranched polyborosiloxane in Example 1 of patent document CN107868252B; the functional filler is a compound of silicon powder, graphene nanosheet and silicon nitride at a mass ratio of 3:0.5:0.5; the silicon powder is silicon powder GSF-2; the graphene nanosheet has a sheet diameter of 1-10 μm, a thickness of 2-3 nm and a D50 particle size of 5 μm; the silicon nitride has an average particle size of 20 nm; the other functional additives are a compound of coupling agent, dispersant, defoaming agent and corrosion inhibitor at a mass ratio of 3:0.8:1:1; the coupling agent is silane coupling agent KH550; the dispersant is super dispersant Tech-6320; the defoaming agent is defoaming agent Defom 6800; the corrosion inhibitor is a compound of zinc molybdate and aluminum tripolyphosphate at a mass ratio of 2:3; the rare earth oxide is cerium oxide; the rare earth oxide has an average particle size of 60 nm; the diluent is a compound of diluent MD-2013 and diluent Ultra LITE 2020 at a mass ratio of 1:3; the bentonite is HFGEL-140; the wax paste is 3300 polyamide wax dispersion; the curing agent is a compound of 2636 epoxy curing agent, 3,3'-diamino-4,4'-difluorodiphenyl sulfone, phenyl melamine and 9,9-bis(4-aminophenyl)fluorene at a mass ratio of 1:1:0.5:0.3.

[0035] A preparation method of the high-temperature-resistant anticorrosive coating, comprising the following steps: adding each component of the main agent into a mixing container, stirring uniformly and reserving; adding the curing agent into the mixing container, stirring uniformly and reserving; mixing and stirring the main agent and the curing agent at a proportion to be a uniform phase, thereby obtaining the high-temperature-resistant anticorrosive coating.

[0036] Example 2: A high-temperature-resistant anticorrosive coating, composed of a main agent and a curing agent; the mass ratio of the main agent and the curing agent is 9:1; the main agent comprises the following components by weight fraction: epoxy resin 39 parts, epoxy-containing hyperbranched polyborosiloxane 11 parts, functional filler 32 parts, other functional additives 3.5 parts, rare earth oxide 3.5 parts, diluent 3.5 parts, bentonite 0.35 parts, wax paste 0.85 parts.

[0037] The epoxy resin is SM618, with an epoxy equivalent weight of 184-200 g / eq and a viscosity of 10000-25000 mpa·s at 25℃, provided by Jiangsu Sanmu; the epoxy-containing hyperbranched polyborosiloxane is prepared according to the method for preparing a hyperbranched polyborosiloxane in Example 1 of patent document CN107868252B; the functional filler is a compound of silicon powder, graphene nanosheet, and silicon nitride at a mass ratio of 3.5:0.6:0.5; the silicon powder is silicon powder GSF-2; the graphene nanosheet has a sheet diameter of 1-10 μm, a thickness of 2-3 nm, and a D50 particle size of 5 μm; the silicon nitride has an average particle size of 30 nm; the other functional additives are a compound of coupling agent, dispersant, defoaming agent, and corrosion inhibitor at a mass ratio of 3.5:0.9:1:1.3; the coupling agent is silane coupling agent KH560; the dispersant is super dispersant Tech-6320; the defoaming agent is defoaming agent Defom6800.

[0038] The corrosion inhibitor is a compound of zinc molybdate and aluminum tripolyphosphate at a mass ratio of 2:3; the rare earth oxide is yttrium oxide; the rare earth oxide has an average particle size of 70 nm; the diluent is a compound of Lai Ultra LITE 2020 and diluent MD-2013 at a mass ratio of 1:3; the bentonite is HFGEL-140; the wax paste is 3300 polyamide wax dispersion; the curing agent is a compound of 2636 epoxy curing agent, 3,3'-diamino-4,4'-difluorodiphenyl sulfone, benzoguanamine, and 9,9-bis(4-aminophenyl)fluorene at a mass ratio of 1:1:0.5:0.3.

[0039] A preparation method of the high-temperature-resistant anticorrosive coating, comprising the following steps: adding each component of the main agent into a mixing container, stirring uniformly, and reserving; adding the curing agent into the mixing container, stirring uniformly, and reserving; mixing and stirring the main agent and the curing agent at a proportion to be a uniform phase, to obtain the high-temperature-resistant anticorrosive coating.

[0040] Example 3: A high-temperature-resistant anticorrosive coating, composed of a main agent and a curing agent; the mass ratio of the main agent and the curing agent is 8:1; the main agent comprises the following components in parts by weight: epoxy resin 38 parts, epoxy-containing hyperbranched polyborosiloxane 13 parts, functional filler 33 parts, other functional additives 4 parts, rare earth oxide 4 parts, diluent 4 parts, bentonite 0.4 parts, and wax paste 0.9 parts.

[0041] The epoxy resin is SM618, with an epoxy equivalent weight of 184-200 g / eq and a viscosity of 10000-25000 mpa·s at 25℃, provided by Jiangsu Sanmu; the epoxy-containing hyperbranched polyborosiloxane is prepared according to the method for preparing a hyperbranched polyborosiloxane in Example 1 of patent document CN107868252B; the functional filler is a compound of silicon powder, graphene nanosheet, and silicon nitride at a mass ratio of 4:0.65:0.5; the silicon powder is silicon powder GSF-2; the graphene nanosheet has a sheet diameter of 1-10 μm, a thickness of 2-3 nm, and a D50 particle size of 5 μm; the silicon nitride has an average particle size of 40 nm; the other functional additives are a compound of coupling agent, dispersant, defoaming agent, and corrosion inhibitor at a mass ratio of 4:1:1:1.5; the coupling agent is silane coupling agent KH570.

[0042] The dispersant is super dispersant Tech-6320; the defoaming agent is defoaming agent Defom 6800; the corrosion inhibitor is a compound of zinc molybdate and aluminum tripolyphosphate at a mass ratio of 2:3; the rare earth oxide is cerium oxide; the rare earth oxide has an average particle size of 80 nm; the diluent is a compound of Lai Ultra LITE 2020 and diluent MD-2013 at a mass ratio of 1:3; the bentonite is HFGEL-140; the wax paste is 3300 polyamide wax dispersion; the curing agent is a compound of 2636 epoxy curing agent, 3,3'-diamino-4,4'-difluorodiphenyl sulfone, benzoguanamine, and 9,9-bis(4-aminophenyl)fluorene at a mass ratio of 1:1:0.5:0.3.

[0043] A preparation method of the high-temperature-resistant anticorrosive coating, comprising the following steps: adding each component of the main agent into a mixing container, stirring uniformly for standby; adding the curing agent into the mixing container, stirring uniformly for standby; mixing and stirring the main agent and the curing agent at a proportion to be a uniform phase, to obtain the high-temperature-resistant anticorrosive coating.

[0044] Example 4: A high-temperature-resistant anticorrosive coating, composed of a main agent and a curing agent; the mass ratio of the main agent and the curing agent is 7.5:1; the main agent comprises the following components by weight part: epoxy resin 37 parts, epoxy-containing hyperbranched polyborosiloxane 14 parts, functional filler 34 parts, other functional additives 4.5 parts, rare earth oxide 4.5 parts, diluent 4.5 parts, bentonite 0.45 parts, and wax paste 0.95 parts.

[0045] The epoxy resin is SM618, with an epoxy equivalent weight of 184-200 g / eq and a viscosity of 10000-25000 mpa·s at 25℃, provided by Jiangsu Sanmu; the epoxy-containing hyperbranched polyborosiloxane is prepared according to the method for preparing a hyperbranched polyborosiloxane in Example 1 of patent document CN107868252B; the functional filler is a compound of silicon powder, graphene nanosheet, and silicon nitride at a mass ratio of 4.5:0.75:0.5; the silicon powder is silicon powder GSF-2; the graphene nanosheet has a sheet diameter of 1-10 μm, a thickness of 2-3 nm, and a D50 particle size of 5 μm; the silicon nitride has an average particle size of 50 nm; the other functional additives are a compound of coupling agent, dispersant, defoaming agent, and corrosion inhibitor at a mass ratio of 4.5:1.1:1:1.8; the coupling agent is a compound of silane coupling agent KH550, silane coupling agent KH560, and silane coupling agent KH570 at a mass ratio of 1:2:1.

[0046] The dispersant is super dispersant Tech-6320; the defoaming agent is defoaming agent Defom 6800; the corrosion inhibitor is a compound of zinc molybdate and aluminum tripolyphosphate at a mass ratio of 2:3; the rare earth oxide is a compound of cerium oxide and yttrium oxide at a mass ratio of 3:5; the rare earth oxide has an average particle size of 90 nm; the diluent is a compound of diluent MD-2013 and diluent Ultra LITE 2020 at a mass ratio of 1:3; the bentonite is HFGEL-140; the wax paste is 3300 polyamide wax dispersion; the curing agent is a compound of 2636 epoxy curing agent, 3,3'-diamino-4,4'-difluorodiphenyl sulfone, benzoguanamine, and 9,9-bis(4-aminophenyl)fluorene at a mass ratio of 1:1:0.5:0.3.

[0047] A preparation method of the high-temperature-resistant anticorrosive coating, comprising the following steps: adding each component of the main agent into a mixing container, stirring uniformly, and reserving; adding the curing agent into the mixing container, stirring uniformly, and reserving; mixing and stirring the main agent and the curing agent at a proportion to be a uniform phase, to obtain the high-temperature-resistant anticorrosive coating.

[0048] Example 5: A high-temperature-resistant anticorrosive coating, composed of a main agent and a curing agent; the mass ratio of the main agent and the curing agent is 7:1; the main agent comprises the following components by weight part: epoxy resin 35 parts, epoxy-containing hyperbranched polyborosiloxane 15 parts, functional filler 35 parts, other functional additives 5 parts, rare earth oxide 5 parts, diluent 5 parts, bentonite 0.5 parts, and wax paste 1 part.

[0049] The epoxy resin is SM618, with an epoxy equivalent weight of 184-200 g / eq and a viscosity of 10000-25000 mpa·s at 25℃, provided by Jiangsu Sanmu; the epoxy-containing hyperbranched polyborosiloxane is prepared according to the method for preparing the hyperbranched polyborosiloxane in Example 1 of patent document CN107868252B; the functional filler is a compound of silicon powder, graphene nanosheet and silicon nitride at a mass ratio of 5:0.8:0.5; the silicon powder is silicon powder GSF-2; the graphene nanosheet has a sheet diameter of 1-10 μm, a thickness of 2-3 nm and a D50 particle size of 5 μm; the silicon nitride has an average particle size of 60 nm; and the other functional additives are a compound of coupling agent, dispersant, defoaming agent and corrosion inhibitor at a mass ratio of 5:1.2:1:2.

[0050] The coupling agent is silane coupling agent KH550; the dispersant is super dispersant Tech-6320; the defoaming agent is defoaming agent Defom 6800; the corrosion inhibitor is a compound of zinc molybdate and aluminum tripolyphosphate at a mass ratio of 2:3; the rare earth oxide is cerium oxide; the rare earth oxide has an average particle size of 100 nm; the diluent is a compound of diluent MD-2013 and diluent Ultra LITE2020 at a mass ratio of 1:3; the bentonite is HFGEL-140; the wax paste is 3300 polyamide wax dispersion; and the curing agent is a compound of 2636 epoxy curing agent, 3,3'-diamino-4,4'-difluorodiphenyl sulfone, phenyl melamine and 9,9-bis(4-aminophenyl)fluorene at a mass ratio of 1:1:0.5:0.3.

[0051] A preparation method of the high-temperature-resistant anticorrosive coating, comprising the following steps: adding each component of the main agent into a mixing container, stirring uniformly and reserving; adding the curing agent into the mixing container, stirring uniformly and reserving; mixing and stirring the main agent and the curing agent at a proper ratio to form a uniform phase, thereby obtaining the high-temperature-resistant anticorrosive coating.

[0052] Comparative Example 1

[0053] This example provides a high-temperature-resistant anticorrosive coating and a preparation method thereof, which are basically the same as those of Example 5, except that an equal amount of epoxy resin is used instead of the epoxy-containing hyperbranched polyborosiloxane.

[0054] Comparative Example 2

[0055] This example provides a high-temperature-resistant anticorrosive coating and a preparation method thereof, which are basically the same as those of Example 5, except that an equal amount of the epoxy-containing hyperbranched polyborosiloxane is used instead of the epoxy resin.

[0056] Comparative Example 3

[0057] The example provides a high-temperature-resistant anticorrosive paint and a preparation method thereof, which are basically the same as those of Example 5, except that an equal amount of 2636 epoxy curing agent is used instead of 3,3'-diamino-4,4'-difluorodiphenyl sulfone.

[0058] Comparative Example 4

[0059] The example provides a high-temperature-resistant anticorrosive paint and a preparation method thereof, which are basically the same as those of Example 5, except that an equal amount of 2636 epoxy curing agent is used instead of 3,3'-diamino-4,4'-difluorodiphenyl sulfone.

[0060] Comparative Example 5

[0061] The example provides a high-temperature-resistant anticorrosive paint and a preparation method thereof, which are basically the same as those of Example 5, except that an equal amount of 2636 epoxy curing agent is used instead of 3,3'-diamino-4,4'-difluorodiphenyl sulfone.

[0062] Comparative Example 6

[0063] The example provides a high-temperature-resistant anticorrosive paint and a preparation method thereof, which are basically the same as those of Example 5, except that an equal amount of 2636 epoxy curing agent is used instead of 3,3'-diamino-4,4'-difluorodiphenyl sulfone.

[0064] Comparative Example 7

[0065] The example provides a high-temperature-resistant anticorrosive paint and a preparation method thereof, which are basically the same as those of Example 5, except that an equal amount of 2636 epoxy curing agent is used instead of 3,3'-diamino-4,4'-difluorodiphenyl sulfone.

[0066] Comparative Example 8

[0067] The example provides a high-temperature-resistant anticorrosive paint and a preparation method thereof, which are basically the same as those of Example 5, except that an equal amount of 2636 epoxy curing agent is used instead of 3,3'-diamino-4,4'-difluorodiphenyl sulfone.

[0068] Comparative Example 9

[0069] The example provides a high-temperature-resistant anticorrosive paint and a preparation method thereof, which are basically the same as those of Example 5, except that an equal amount of 2636 epoxy curing agent is used instead of 3,3'-diamino-4,4'-difluorodiphenyl sulfone.

[0070] In order to further illustrate the beneficial technical effects of the high-temperature-resistant anticorrosive paint involved in the embodiments of the present application, the high-temperature-resistant anticorrosive paints involved in Example 5 and Comparative Examples 1-9 are tested for relevant performance, and the test results are shown in Table 1, and the test methods are as follows: the paints prepared in the above examples and comparative examples are coated on the surface of a sample plate (steel plate) to prepare a coating film with a thickness of 80 μm, which is cured at 100 ℃ for 30 min and then cured at 120 ℃ for 1 h to prepare a coating film, and the performance of the coating film is tested,

[0071] (1) Adhesion test: test and grade according to GB / T 9286-1998.

[0072] (2) High temperature cycle resistance test: place the test piece in a muffle furnace and heat to 620℃, keep for 6h, take out and cool to room temperature 20℃, cycle for 10 times, observe whether there is cracking and bubble generation, if there is no cracking and bubble, the high temperature cycle resistance performance is qualified, if cracking or / and bubble generation occurs, the high temperature cycle resistance performance does not pass.

[0073] (3) Neutral salt spray test: test according to GB / T 10125-2021 "Artificial atmosphere corrosion test Salt spray test", 5% NaCl solution, temperature 35℃, continuous spraying, record the time (h) of rust spot (area ≥5%) of the coating appears;

[0074] (4) Acid and alkali corrosion resistance: refer to GB / T 9274-1988 "Paint and varnish Determination of resistance to liquid medium", respectively immersed in 5% H2SO4 solution, 5% NaOH solution, 70℃ for 1000h, determine the weight loss rate (%) of the coating.

[0075] Table 1 Performance test results of high temperature resistant anticorrosive coating

[0076]

[0077] From Table 1, it can be seen that the high temperature resistant anticorrosive coating prepared by Example 5 of the present application exhibits significantly better adhesion, high temperature cycle resistance and corrosion resistance than each comparative example. The combination of epoxy resin, hyperbranched polyborosiloxane containing epoxy group, 3,3'-diamino-4,4'-difluorodiphenyl sulfone, 9,9-bis(4-aminophenyl) fluorene, rare earth oxide, graphene nanosheet and silicon nitride is beneficial to improving the above properties.

[0078] The above examples are only for illustrating the technical concept and characteristics of the present application, the purpose is to enable those skilled in the art to understand the content of the present application and to implement it, and it cannot limit the protection scope of the present application, any equivalent changes or modifications made according to the spirit and essence of the present application should be covered within the protection scope of the present application.

Claims

1. A high temperature resistant anticorrosive paint, characterized by, It is composed of two parts of main agent and curing agent; the mass ratio of the main agent and the curing agent is (7-10):1; the main agent comprises the following components by weight parts: epoxy resin 35-40 parts, epoxy group-containing hyperbranched polysilicic silicone 10-15 parts, functional filler 30-35 parts, other functional additives 3-5 parts, rare earth oxide 3-5 parts, diluent 3-5 parts, bentonite 0.3-0.5 parts, wax paste 0.8-1 part; the curing agent is a compound of 2636 epoxy curing agent, 3,3'-diamino-4,4'-difluorodiphenyl sulfone, phenyl melamine and 9,9-bis(4-aminophenyl)fluorene in a mass ratio of 1:1:0.5:0.3; the functional filler is a compound of silicon powder, graphene nanosheet and silicon nitride in a mass ratio of (3-5):(0.5-0.8):0.

5.

2. The high temperature resistant anticorrosive paint according to claim 1, characterized in that, The model of the epoxy resin is SM618, the epoxy equivalent weight is 184-200 g / eq, and the viscosity at 25 DEG C is 10000-25000 mpa·s.

3. The high temperature resistant anticorrosive paint according to claim 1, characterized in that, The silicon powder is silicon powder GSF-2; the graphene nanosheet has a sheet diameter of 1-10 mu m, a thickness of 2-3 nm, and a D50 particle size of 5 mu m; and the silicon nitride has an average particle size of 20-60 nm.

4. The high temperature resistant anticorrosive paint according to claim 1, characterized in that, The other functional additives are a compound of coupling agent, dispersant, defoaming agent, and corrosion inhibitor in a mass ratio of (3-5):(0.8-1.2):1:(1-2).

5. The high temperature resistant anticorrosive paint according to claim 4, characterized in that, The coupling agent is at least one of silane coupling agent KH550, silane coupling agent KH560 and silane coupling agent KH570; the dispersant is super dispersant Tech-6320; the defoaming agent is defoaming agent Defom 6800; and the corrosion inhibitor is a compound of zinc molybdate and aluminum tripolyphosphate in a mass ratio of 2:

3.

6. The high temperature resistant anticorrosive paint according to claim 1, characterized in that, The rare earth oxide is at least one of cerium oxide and yttrium oxide; and the average particle size of the rare earth oxide is 60-100 nm.

7. The high temperature resistant anticorrosive paint according to claim 1, characterized in that, The diluent is a compound of Lai Ultra LITE2020 and diluent MD-2013 in a mass ratio of 1:3; the bentonite is HFGEL-140; and the wax paste is 3300 polyamide wax dispersion.

8. A process for the preparation of a high temperature resistant anticorrosive coating as claimed in any one of claims 1 to 7, characterized in that, It comprises the following steps: adding each component of the main agent into a mixing container, stirring uniformly and reserving; adding the curing agent into the mixing container, stirring uniformly and reserving; mixing and stirring the main agent and the curing agent in proportion to form a uniform phase, and obtaining the high-temperature-resistant and corrosion-resistant coating.

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