High-temperature-resistant damp-heat-resistant anticorrosive paint as well as preparation and use methods thereof

Abstract

The embodiment of the invention relates to a high-temperature-resistant damp-heat-resistant anticorrosive coating as well as a preparation method and a use method thereof, belongs to the technical field of functional coatings, and solves the problem that an existing high-temperature-resistant coating cannot give consideration to durability and corrosion resistance in a damp-heat environment. The high-temperature-resistant damp-heat-resistant anticorrosive paint comprises a first component and a second component, the first component comprises 35-55 parts of organic silicon resin, 20-40 parts of functional filler, 5-15 parts of a corrosion inhibitor, 5-15 parts of inorganic nanoparticles, 1-3 parts of an auxiliary agent and 5-15 parts of a solvent; and the second component comprises 1-5 parts of an amine curing agent. By adding the functional filler, the permeability resistance and thermal stability of the coating can be enhanced; by adding the corrosion inhibitor and the inorganic nanoparticles, gaps among the functional fillers can be filled, the corrosion inhibitor and the inorganic nanoparticles have a synergistic effect with the functional fillers, the compactness of the coating is increased, and the water resistance and the corrosion resistance of the coating are improved, so that the coating disclosed by the invention has excellent high temperature resistance, damp heat resistance and corrosion resistance.

Description

Technical Field

[0001] The present invention relates to the technical field of functional coatings, and particularly relates to a high-temperature, high-humidity and corrosion-resistant coating and its preparation and use methods. Background Art

[0002] In a high-temperature and high-humidity environment, the surface of industrial equipment is easily eroded by corrosive media, resulting in coating failure problems such as decreased adhesion, cracking, peeling, and accelerated corrosion. This phenomenon is particularly significant in the fields of chemical engineering, ocean engineering, and industrial equipment. Currently, common high-temperature coatings use silicone resin as the main film-forming material, and the high bond energy of its Si—O bond makes it exhibit good thermal stability under high-temperature conditions. However, the comprehensive performance of such coatings in high-humidity and corrosive environments is still insufficient.

[0003] Most of the existing high-temperature coatings are optimized for single performance and fail to take into account the durability and corrosion resistance of the coatings in a humid and hot environment. This deficiency limits the wide application of the coatings under complex working conditions. Summary of the Invention

[0004] In view of the above analysis, embodiments of the present invention aim to provide a high-temperature, high-humidity and corrosion-resistant coating and its preparation and use methods to solve the problem that existing high-temperature coatings cannot take into account the durability and corrosion resistance in a humid and hot environment.

[0005] On the one hand, embodiments of the present invention provide a high-temperature, high-humidity and corrosion-resistant coating, including: a first component and a second component; the first component includes: 35-55 parts of silicone resin, 20-40 parts of functional filler, 5-15 parts of corrosion inhibitor, 5-15 parts of inorganic nanoparticles, 1-3 parts of additive, and 5-15 parts of solvent; the second component includes: 1-5 parts of amine curing agent.

[0006] Further, the mass ratio of the first component to the second component is 100:(1-5).

[0007] Further, the functional filler includes: one or a combination of more of fluorophlogopite, micaceous iron oxide, silicon carbide, boron nitride; preferably, the particle size of the functional filler is 1-100 μm.

[0008] Further, the corrosion inhibitor includes: one or a combination of more of iron oxide red, zinc phosphate, aluminum tripolyphosphate, molybdate, or rare earth oxide; preferably, the particle size of the corrosion inhibitor is 1-50 μm.

[0009] Further, the inorganic nanoparticles include: one or a combination of more of nano-silicon carbide, nano-zinc oxide, nano-zirconium oxide, nano-cerium oxide; preferably, the particle size of the inorganic nanoparticles is 1-500 nm.

[0010] Further, the silicone resin includes methyl silicone resin, phenyl silicone resin, fluorine-containing silicone resin, amino silicone resin, and epoxy group-containing silicone resin.

[0011] Further, the solvent includes one or more of ethyl acetate, butyl acetate, xylene, and PMA.

[0012] On the other hand, an embodiment of the present invention also provides a preparation method of a high-temperature, high-humidity and corrosion-resistant coating for preparing the coating of the above embodiment, which includes:

[0013] S1, Weigh the silicone resin and the solvent according to the coating formula, and stir and mix them evenly;

[0014] S2, Add functional fillers, corrosion inhibitors, and inorganic nanoparticles to the dissolved silicone resin according to the formula, and stir and mix them evenly;

[0015] S3, Add additives according to the formula, and stir and disperse them;

[0016] S4, Grind the dispersed mixture until the fineness reaches below 40 μm to obtain the first component;

[0017] S5, Prepare an amine curing agent to obtain the second component.

[0018] Further, in S1 and S2, the stirring speed is 400-800 rpm, and the stirring time is 10-30 min; in S3, the stirring speed is 1000-1500 rpm, and the stirring time is 60-90 min.

[0019] An embodiment of the present invention also provides a usage method of the high-temperature, high-humidity and corrosion-resistant coating of the above embodiment, which includes: adding the second component to the first component in proportion, stirring evenly and then coating it on the surface of the substrate; curing at 180-210 °C for 60-90 min to form a high-temperature, high-humidity and corrosion-resistant coating.

[0020] The present invention can at least achieve one of the following beneficial effects:

[0021] 1. By adding functional fillers, the coating of the present invention can enhance the anti-permeability and thermal stability of the coating; by adding corrosion inhibitors and inorganic nanoparticles, the gaps between the functional fillers can be filled, and they can act synergistically with the functional fillers to increase the denseness of the coating, jointly block the penetration of water vapor and corrosive media, and improve the water resistance and corrosion resistance of the coating.

[0022] 2. By selecting appropriate functional fillers, the present invention can enhance the anti-permeability and thermal stability of the coating; by selecting appropriate corrosion inhibitors, while passivating the substrate, it can also fill the gaps between the functional fillers, increase the density of the coating, improve the water resistance and corrosion resistance of the coating; by selecting appropriate inorganic nanoparticles, it can enhance the heat resistance, mechanical properties and chemical stability of the coating, while further filling the gaps between the functional fillers, enhancing the corrosion resistance of the coating and extending the service life of the coating.

[0023] 3. By controlling the particle sizes of the functional fillers, corrosion inhibitors and inorganic nanoparticles, the present invention ensures that the above components are completely infiltrated and coated by the resin, and are easy to disperse, spray smoothly, and improve the uniformity of the coating.

[0024] 4. The coating of the present invention has excellent high-temperature resistance, damp-heat resistance, corrosion resistance and high adhesion, enabling it to be widely applied to the surfaces of metals or composite materials that need to be protected, such as chemical equipment, ocean engineering, power equipment and pipelines, and is particularly suitable for high-temperature, damp-heat and corrosive environments, which can improve the durability and safety of equipment.

[0025] In the present invention, the above technical solutions can also be combined with each other to achieve more preferred combination schemes. Other features and advantages of the present invention will be described in the subsequent description, and some advantages can be made obvious from the description, or understood by implementing the present invention. The objectives and other advantages of the present invention can be achieved and obtained through the content specifically pointed out in the description. Detailed Embodiments

[0026] To make the objectives, technical solutions and advantages of the present invention clearer, exemplary embodiments of the present invention will be described hereinafter. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. For the sake of clarity and conciseness, not all features of the actual implementation are described in the description.

[0027] An embodiment of the present invention provides a high-temperature and damp-heat resistant anticorrosive coating, comprising: a first component and a second component; wherein, the first component includes: 35-55 parts of silicone resin, 20-40 parts of functional fillers, 5-15 parts of corrosion inhibitors, 5-15 parts of inorganic nanoparticles, 1-3 parts of additives and 5-15 parts of solvents; the second component includes: 1-5 parts of amine curing agents.

[0028] The coating of the present invention can enhance the anti-permeability and thermal stability of the coating by adding functional fillers; by adding corrosion inhibitors and inorganic nanoparticles, the gaps between the functional fillers can be filled, and they can act synergistically with the functional fillers to increase the density of the coating, improve the water resistance and corrosion resistance of the coating, and the inorganic nanoparticles can also enhance the heat resistance, mechanical properties and chemical stability of the coating, and extend the service life of the coating.

[0029] In addition, the coating of the present invention uses an amine curing agent, which can improve the heat resistance and mechanical properties of the coating, and enhance the protection performance of the coating in humid and corrosive environments.

[0030] The present invention uses silicone resin as the film-forming substance. Its main chain is composed of Si-O bonds, and its bond energy is extremely high, making it have excellent stability at high temperatures, so that the coating has excellent high-temperature resistance.

[0031] In some embodiments, the silicone resin includes methyl silicone resin, phenyl silicone resin, fluorinated silicone resin, amino silicone resin, and epoxy silicone resin.

[0032] Preferably, the silicone resin is epoxy silicone resin. In the embodiments of the present invention, epoxy silicone resin is selected as the main film-forming substance. By introducing epoxy groups, the adhesion performance of the resin is improved, and it has excellent adhesion to a variety of substrates (such as metals, glasses, ceramics, etc.), and can keep the coating stable in high-temperature environments, while improving the adhesion of the coating.

[0033] Preferably, the epoxy value of the epoxy silicone resin is 0.06-0.16 mol / 100 g. If the epoxy value is too low, the crosslinking degree of the resin will be low, and the adhesion of the coating will be reduced; if the epoxy value is too high, it will affect the temperature resistance of the coating, and the coating will be more likely to fail under high temperature for a long time.

[0034] In some embodiments, the amine curing agent includes at least one of diethylenetriamine, phenylenediamine, and polyamide.

[0035] In some embodiments, the mass ratio of the first component to the second component (i.e., the amine curing agent) is set to 100:(1-5). By controlling the mass ratio of the first component to the second component, the present invention can make the coating have a good curing effect and avoid the reduction of the coating performance caused by poor curing effect. Among them, if the content of the curing agent is too high, it may lead to an increase in the brittleness of the coating and an abnormal curing speed, resulting in low temperature resistance and adhesion of the coating; if the content of the curing agent is too low, it will lead to incomplete curing of the coating and a decrease in the overall performance of the coating, such as a decrease in the hardness, solvent resistance, corrosion resistance, and high-temperature steam resistance of the coating.

[0036] In some embodiments, the functional filler comprises: a combination of one or more of fluorophlogopite, micaceous iron oxide, silicon carbide, and boron nitride. The selected functional fillers in this embodiment are all high-temperature resistant fillers, which can enhance the anti-permeability and thermal stability of the coating.

[0037] The content of the functional filler is 20 to 40 parts. For example, 20 parts, 25 parts, 30 parts, 35 parts, 40 parts, etc. The present invention comprehensively considers functions such as the anti-corrosion performance and temperature resistance performance of the coating, as well as the mechanical properties of the coating, and controls the addition amount of the functional filler with the anti-corrosion performance and temperature resistance performance as the leading factors. In the invention, if the content of the functional filler is too low, the corrosion resistance and high-temperature resistance of the coating will decrease; if the content is too high, it will lead to a decline in the mechanical properties of the coating, such as a decline in properties such as adhesion, flexible impact performance, and hardness.

[0038] Preferably, the shape of the functional filler is flaky. Selecting flaky functional fillers can improve the ability of the coating to block the penetration of water vapor and corrosive media. The flaky fillers can form a dense barrier layer and extend the penetration path of the corrosive media.

[0039] Specifically, the particle size of the functional filler is 1 to 100 μm; preferably, the particle size of the functional filler is 10 to 40 μm. For example, the average particle size of the functional filler can be 10 μm, 15 μm, 20 μm, 25 μm, 30 μm, 35 μm, 40 μm, etc. The particle size of the functional filler has a great influence on the coating performance. If the particle size is too small, it cannot play the role of isolating water vapor and corrosive media, and because the particle size is too small, the specific surface area of the functional filler increases, which in turn increases its oil absorption amount (i.e., resin adsorption amount), resulting in problems with resin wetting and wrapping the filler; while if the particle size is too large, it will lead to difficulties in dispersing the functional filler, unsmooth spraying, and possible defects in the coating uniformity.

[0040] In some embodiments, the corrosion inhibitor comprises: a combination of one or more of iron oxide red, zinc phosphate, aluminum tripolyphosphate, molybdate, or rare earth oxide. By adding a corrosion inhibitor to the coating in this embodiment, not only can the substrate be passivated, but also the gaps between the functional fillers can be filled, and in cooperation with the functional fillers, the compactness of the coating can be increased, thereby significantly improving the water resistance and corrosion resistance of the coating.

[0041] The content of the corrosion inhibitor is 5 to 15 parts. For example, 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, 10 parts, 12 parts, 14 parts, 15 parts, etc. If the content of the corrosion inhibitor is too small, it cannot play the role of enhancing the anti-corrosion and damp-heat resistance of the coating. For example, if the content of zinc phosphate, aluminum tripolyphosphate, etc. is small, it will cause the passivation film to be unable to cover the substrate, weakening the anodic protection effect; if the content of iron oxide red is small, it will lead to poor physical shielding effect, increased water and oxygen permeability, and corrosion media are easy to penetrate the coating. If the content of the corrosion inhibitor is too high, it will cause the mechanical properties of the coating to deteriorate, the anti-corrosion effect will not increase but decrease, and the cost will increase.

[0042] Specifically, the particle size of the corrosion inhibitor is 1 to 50 μm; preferably, the particle size of the corrosion inhibitor is 5 to 10 μm. For example, the average particle size of the corrosion inhibitor can be 5 μm, 6 μm, 7 μm, 8 μm, 9 μm, 10 μm, etc. Similar to the functional filler, if the particle size of the corrosion inhibitor is too small, it may be difficult to completely coat it in the resin, affecting the coating performance; if the particle size is too large, its dispersibility will be poor, which is likely to affect the uniform distribution of the coating, and the larger particle size may lead to poor effect of filling the gaps between the functional fillers, thereby affecting the denseness of the coating.

[0043] In some embodiments, the inorganic nanoparticles include: one or a combination of more of nano silicon carbide, nano zinc oxide, nano zirconium oxide, and nano cerium oxide. By adding the above inorganic nanoparticles to the coating in this embodiment, not only can the heat resistance, mechanical properties, and chemical stability of the coating be improved, but also it can cooperate with the functional filler and the corrosion inhibitor to further fill the gaps between the functional fillers, enhance the corrosion resistance of the coating, and extend the service life of the coating.

[0044] The content of the inorganic nanoparticles is 5 to 15 parts. For example, 5 parts, 6 parts, 8 parts, 10 parts, 12 parts, 14 parts, 15 parts, etc. The specific addition amount of the inorganic nanoparticles can be adjusted according to the addition amount and type of the functional filler. From the perspective of the denseness of the coating, when the addition amount of the functional filler increases, the inorganic nanoparticles can be appropriately increased to fill the gaps in the functional filler, making the coating more dense; when the organosilicon resin wraps the functional filler more densely, the addition amount of the inorganic nanoparticles can be appropriately reduced. In addition, from the perspective of the coating performance, if the addition amount of the inorganic nanoparticles is too small, the temperature resistance, corrosion resistance, etc. of the coating cannot be improved; if the addition amount is too high, the mechanical properties will decline and the cost will increase. Therefore, the content of the inorganic nanoparticles in the coating is preferably 5 to 15 parts.

[0045] Specifically, the particle size of the inorganic nanoparticles is 1 to 500 nm; preferably, the particle size of the inorganic nanoparticles is 1 to 200 nm; for example, the average particle size of the inorganic nanoparticles can be 1 nm, 10 nm, 20 nm, 30 nm, 40 nm, 50 nm, 60 nm, 70 nm, 80 nm, 90 nm, 100 nm, 120 nm, 140 nm, 160 nm, 180 nm, 200 nm, etc. By controlling the particle size of the inorganic nanoparticles within a suitable range, it is ensured that the inorganic nanoparticles are completely coated by the resin, which is easy to disperse in the coating and improves the uniformity of the coating.

[0046] In the embodiments of the invention, the content of the silicone resin is 35 to 55 parts, for example, 35 parts, 40 parts, 45 parts, 50 parts, 55 parts, etc. Among them, the specific content of the silicone resin is determined according to factors such as the type, particle size and oil absorption amount of each filler. If the particle size of the filler is small and the surface area is high, a higher amount of resin is required; for fillers with a large oil absorption amount, a larger amount of resin is also required. The present invention comprehensively considers factors such as the type, particle size and oil absorption amount of each filler, and by controlling the content of the silicone resin, the coating can take into account mechanical properties as well as properties such as anti-corrosion, high temperature resistance and humidity resistance. If the resin amount is too low, the mechanical properties of the coating will be reduced; if the resin amount is too high, although the properties such as flexibility and impact resistance of the coating are improved, the anti-corrosion performance, temperature resistance and high temperature moisture resistance of the coating will all be reduced.

[0047] In some embodiments, the additives include one or more of an anti-settling agent, a leveling agent and a wetting and dispersing agent. By adding additives, the workability of the coating and the quality of the paint film can be improved.

[0048] Specifically, the anti-settling agent can prevent components such as functional fillers, corrosion inhibitors, and inorganic nanoparticles from settling and aggregating in the coating, thereby maintaining the uniformity and stability of the coating. The anti-settling agent is preferably one or more of organobentonite, fumed silica or modified fatty acid amide thixotropic agent.

[0049] The leveling agent can improve the leveling property and uniformity of the coating, and promote the formation of a flat, smooth and uniform coating during the curing and film-forming process of the coating. The leveling agent is preferably one or more of CN-322, BYK-310 or TEGO Glide 415.

[0050] The wetting and dispersing agent can reduce the surface tension of the coating and improve the dispersibility of solids such as functional fillers, corrosion inhibitors, and inorganic nanoparticles in the coating. The wetting and dispersing agent is preferably one or more of BYK-110, TEGO Dispers 6805.

[0051] In some embodiments, the solvent includes one or more of ethyl acetate, butyl acetate, xylene, and PMA. By using the above organic solvents, the fluidity and workability of the coating can be improved.

[0052] By adding appropriate amounts of functional fillers, corrosion inhibitors, and inorganic nanoparticles to the coating of the present invention, the coating has the following properties: (1) High-temperature resistance: The coating is tested at a high temperature of 250 °C for 1000 h, and there is no cracking or peeling of the coating; (2) Damp heat resistance: The coating is tested at a humidity of more than 95% and a temperature of 50 °C for 1000 h, and the coating performance shows no obvious change; (3) Corrosion resistance: After 3000 h of salt spray testing, there is no corrosion or blistering of the coating; (4) Excellent adhesion: The initial adhesion of the coating can reach 20 MPa, and after 20 boiling-water standing cycles, the adhesion can also be maintained at 15 MPa.

[0053] The coating of the present invention has excellent high-temperature resistance, damp heat resistance, corrosion resistance, and high adhesion, making it widely applicable to the surfaces of metals or composite materials that need to be protected, such as chemical equipment, ocean engineering, power equipment, and pipelines, especially suitable for high-temperature, humid, and corrosive environments, and can improve the durability and safety of equipment; moreover, the coating of the present invention has a wide range of raw material sources, low prices, and low costs.

[0054] The embodiment of the present invention also provides a preparation method of a high-temperature and damp heat-resistant anticorrosive coating, which can be used to prepare the coating in the above embodiments. The preparation method includes:

[0055] S1, Weigh the silicone resin and the solvent according to the coating formula and stir them evenly.

[0056] S2, Add the functional filler, corrosion inhibitor, and inorganic nanoparticles to the dissolved silicone resin in proportion and stir them evenly.

[0057] S3, Add the auxiliary agent in proportion and stir and disperse it.

[0058] S4, Grind the dispersed mixture until the fineness reaches below 40 μm to obtain the first component.

[0059] S5, Prepare the amine curing agent to obtain the second component.

[0060] In the preparation method of the present invention, the silicone resin is first mixed with the solvent to dissolve the resin and reduce the viscosity of the resin, which is beneficial to the subsequent dispersion of components such as fillers in the resin; then the functional filler, corrosion inhibitor, and inorganic nanoparticles are mixed in the resin to make the dispersion of each component more sufficient; finally, the auxiliary agent is added to avoid the early addition of the auxiliary agent, which may cause an increase in viscosity and uneven dispersion of the coating. In addition, by grinding in the present invention, the fineness of the first component is below 40 μm, which can ensure the uniform dispersion of each component in the coating.

[0061] Specifically, in steps S1 and S2, the stirring speed is 400 - 800 rpm, and the stirring time is 10 - 30 min. The stirring speed should not be too low, as too low a speed can easily lead to poor dispersion of the materials and low mixing uniformity; nor should the stirring speed be too high, as it is not energy-saving. The stirring time can be adjusted according to the dispersion state to ensure uniform color distribution. Since further dispersion is still required later, there is no need to stir for too long. For example, the stirring speed can be 400 rpm, 500 rpm, 600 rpm, 700 rpm, 800 rpm, etc.; the stirring time can be 10 min, 15 min, 20 min, 25 min, 30 min, etc.

[0062] In step S3, the stirring speed is 1000 - 1500 rpm, and the stirring time is 60 - 90 min. For example, the stirring speed can be 1000 rpm, 1100 rpm, 1200 rpm, 1300 rpm, 1400 rpm, 1500 rpm, etc.; the stirring time can be 60 min, 70 min, 80 min, 90 min, etc.

[0063] In order to mix and disperse the silicone resin, filler, and additives as a whole, the stirring speed and time are increased in step S3 to avoid too low a shear force caused by too low a speed, resulting in non-uniform dispersion of the coating; too high a stirring speed will cause too high a shear force, damaging the interface between components such as the resin and filler, and at the same time, there may be a phenomenon of overheating of the coating. The stirring time can be specifically adjusted according to the mixing and dispersion effect to avoid incomplete dispersion of the coating due to too short a stirring time, and wasting time and energy due to too long a time.

[0064] In step S4, a sand mill can be used to grind the coating so that the fineness of the coating reaches below 40 μm to ensure that the fineness of the coating meets the standard.

[0065] The embodiment of the present invention also provides a method for using a high-temperature, high-humidity and corrosion-resistant coating, including:

[0066] Adding the second component to the first component in proportion, stirring evenly and then coating on the surface of the substrate;

[0067] Curing at 180 - 210 °C for 60 - 90 min to form a high-temperature, high-humidity and corrosion-resistant coating.

[0068] The present invention cures the above coating at a high temperature of 180 - 210 °C, which can shorten the curing time and ensure that the coating has excellent mechanical properties and long-term stability.

[0069] The following further illustrates the high-temperature, high-humidity and corrosion-resistant coating of the present invention and its preparation and use methods with specific examples.

[0070] Example 1

[0071] A high-temperature, high-humidity and corrosion-resistant coating, comprising:

[0072] The first component:

[0073] Epoxy organosilicon resin SH-023: 35 parts;

[0074] Fluorphlogopite: 40 parts;

[0075] Zinc phosphate: 6 parts;

[0076] Nano silicon carbide: 5 parts;

[0077] Organic bentonite: 0.5 part;

[0078] CN-322: 0.5 part;

[0079] BYK-110: 1 part;

[0080] Xylene: 6 parts;

[0081] Butyl acetate: 6 parts;

[0082] The second component:

[0083] Amine polyamide: 1 part.

[0084] The preparation method of the above high-temperature, high-humidity and corrosion-resistant coating is as follows:

[0085] Dissolve the epoxy organosilicon resin in a mixed solvent of xylene and butyl acetate, stir at a speed of 400 rpm for 15 min, then add fluorphlogopite, zinc phosphate, and nano silicon carbide at this speed and stir for 20 min. Add organic bentonite, CN-322, and BYK-110 additives at this speed, adjust the speed to 1200 rpm, and disperse for 90 min. Use a grinding machine to fully grind the dispersed base material until the fineness of the paint is lower than 40 μm and discharge to obtain the first component of the high-temperature, high-humidity and corrosion-resistant coating.

[0086] During use, add an amine curing agent to the first component according to the ratio, stir evenly and apply it on the substrate, and cure at 180 °C for 90 min to obtain a high-temperature, high-humidity and corrosion-resistant coating.

[0087] Example 2

[0088] A high-temperature, high-humidity and corrosion-resistant coating, the formula is as follows:

[0089] The first component:

[0090] Epoxy organosilicon resin SH-023: 55 parts;

[0091] Boron nitride powder: 20 parts;

[0092] Molybdate: 5 parts;

[0093] Nano zinc oxide: 10 parts;

[0094] Fumed silica: 0.3 part;

[0095] BYK-310: 0.7 part;

[0096] TEGO Dispers 6805: 1 part;

[0097] Butyl acetate: 4 parts;

[0098] PMA: 4 parts;

[0099] Second component:

[0100] Phenylenediamine: 5 parts.

[0101] The preparation method of the above high-temperature and humidity-resistant anticorrosive coating is as follows:

[0102] Dissolve the epoxy organosilicon resin in a mixed solvent of butyl acetate and PMA, and stir at a speed of 800 rpm for 15 min; then add boron nitride powder, molybdate, and nano zinc oxide at this speed and stir for 20 min; add fumed silica, BYK-310, and EGO Dispers 6805 at this speed, adjust the speed to 1500 rpm, and disperse for 60 min. Grind the well-dispersed base material with a grinder until the fineness of the paint is lower than 40 μm and discharge to obtain the first component of the high-temperature and humidity-resistant anticorrosive coating.

[0103] Add an amine curing agent to the first component according to the ratio, stir evenly and apply it on the substrate, and cure at 210 °C for 1 h to obtain a high-temperature and humidity-resistant anticorrosive coating.

[0104] Example 3

[0105] A high-temperature and humidity-resistant anticorrosive coating, the formula is as follows:

[0106] First component:

[0107] Epoxy organosilicon resin SH-023: 40 parts;

[0108] Mica iron oxide: 30 parts;

[0109] Aluminum tripolyphosphate: 5 parts;

[0110] Zinc phosphate: 9 parts;

[0111] Nano cerium oxide: 3 parts;

[0112] Nano zirconia: 3 parts;

[0113] Organic bentonite: 0.5 part;

[0114] TEGO Glide 415: 0.5 part;

[0115] BYK-110: 1 part;

[0116] Ethyl acetate: 4 parts;

[0117] Xylene: 4 parts;

[0118] Second component:

[0119] Diethylenetriamine polyamide: 4 parts;

[0120] The preparation method of the above high temperature and humidity resistant anticorrosive coating is as follows:

[0121] Dissolve the epoxy organosilicon resin in the mixed solvent of ethyl acetate and xylene, stir at 600 rpm for 15 min; then add mica iron oxide, aluminum tripolyphosphate, zinc phosphate, nano cerium oxide, and nano zirconium oxide at this speed and stir for 20 min; add organic bentonite, TEGO Glide 415, and BYK-110 at this speed, adjust the speed to 1500 rpm, and disperse for 60 min. Grind the dispersed base material thoroughly with a grinder until the fineness is less than 40 μm and then discharge to obtain the first component of the high temperature and humidity resistant anticorrosive coating.

[0122] Add the amine curing agent to the first component according to the proportion, stir evenly and apply it on the substrate, and cure at 180 °C for 90 min to obtain the high temperature and humidity resistant anticorrosive coating.

[0123] Example 4

[0124] A high temperature and humidity resistant anticorrosive coating, the formula is as follows:

[0125] First component:

[0126] Epoxy organosilicon resin SM-023: 45 parts;

[0127] Fluorphlogopite: 20 parts;

[0128] Zinc phosphate: 7.5 parts;

[0129] Aluminum tripolyphosphate: 7.5 parts

[0130] Nano cerium oxide: 10 parts;

[0131] Fumed silica: 0.3 part

[0132] TEGO Glide 415: 0.7 part

[0133] TEGO Dispers 6805: 1 part

[0134] Butyl acetate: 4 parts;

[0135] PMA: 4 parts;

[0136] The second component:

[0137] Phenylenediamine: 3 parts.

[0138] The preparation method of the above high-temperature and humidity-resistant anticorrosive coating is as follows:

[0139] Dissolve the epoxy organosilicon resin in the mixed solvent of butyl acetate and PMA, and stir at a speed of 500 rpm for 15 min; add fluorophlogopite, zinc phosphate, aluminum tripolyphosphate, and nano-cerium oxide and stir for 20 min at this speed; add fumed silica, TEGO Glide 415, and EGO Dispers 6805 at this speed, adjust the speed to 1000 rpm, and disperse for 90 min. Use a grinder to fully grind the dispersed base material until the fineness of the base material is lower than 40 μm and discharge to obtain the first component of the high-temperature and humidity-resistant anticorrosive coating.

[0140] Add the amine curing agent to the first component according to the ratio, mix evenly and apply it on the substrate, and cure at 200 °C for 60 min to obtain the high-temperature and humidity-resistant anticorrosive coating.

[0141] Example 5

[0142] A high-temperature and humidity-resistant anticorrosive coating, the formula is as follows:

[0143] The first component:

[0144] Epoxy organosilicon resin SM-H30: 40 parts;

[0145] Mica iron oxide: 25 parts;

[0146] Zinc phosphate: 5 parts;

[0147] Aluminum tripolyphosphate: 5 parts

[0148] Nano-silicon carbide: 15 parts;

[0149] Organic bentonite: 0.3 part

[0150] CN-322: 0.7 part

[0151] BYK-110: 1 part

[0152] Butyl acetate: 4 parts;

[0153] PMA: 4 parts;

[0154] The second component:

[0155] Amine polyamide: 2 parts.

[0156] The preparation method of the above high-temperature and humidity-resistant anticorrosive coating is as follows:

[0157] Dissolve the epoxy organosilicon resin in a mixed solvent of butyl acetate and PMA, and stir at a speed of 700 rpm for 15 min; add mica iron oxide, zinc phosphate, aluminum tripolyphosphate, and nano silicon carbide at this speed, and stir for 20 min; add organic bentonite, CN-322, and BYK-110 at this speed, adjust the speed to 1400 rpm, and disperse for 60 min. Grind the well-dispersed base material with a grinder until the fineness is less than 40 μm and then discharge to obtain the first component of the high-temperature and humidity-resistant anticorrosive coating.

[0158] During use, add an amine curing agent to the first component according to the ratio, mix evenly and apply it on the substrate, and cure at 200 °C for 60 min to obtain a high-temperature and humidity-resistant anticorrosive coating.

[0159] Comparative Example 1

[0160] The difference between this comparative example and Example 1 is that the coating does not contain inorganic nanoparticles.

[0161] Comparative Example 2

[0162] The difference between this comparative example and Example 1 is that the coating does not contain a slow-release agent.

[0163] Comparative Example 3

[0164] The difference between this comparative example and Example 1 is that the coating does not contain inorganic nanoparticles and a slow-release agent.

[0165] Comparative Example 4

[0166] The difference between this comparative example and Example 1 is that the content of the inorganic nanoparticle nano silicon carbide is 1 part.

[0167] Comparative Example 5

[0168] The difference between this comparative example and Example 1 is that the content of the corrosion inhibitor zinc phosphate is 1 part.

[0169] Comparative Example 6

[0170] The difference between this comparative example and Example 1 is that the content of the inorganic nanoparticle nano silicon carbide is 18 parts.

[0171] Comparative Example 7

[0172] The difference between this comparative example and Example 1 is that the content of the corrosion inhibitor zinc phosphate is 17 parts.

[0173] Comparative Example 8

[0174] The difference between this comparative example and Example 1 is that the content of the functional filler fluorophlogopite is 45 parts.

[0175] Comparative Example 9

[0176] The difference between this comparative example and Example 1 is that the content of the functional filler fluorophlogopite is 18 parts.

[0177] The coatings prepared in the above examples and comparative examples were tested for the following properties: adhesion, hardness, heat resistance at 250 °C, heat and humidity resistance at 96% humidity and 50 °C, neutral salt spray resistance, and boiling-water standing cycle resistance. The test results are shown in Table 1.

[0178] Among them, the method for testing the hardness of the coating is as follows: Scratch tests were carried out on the surface of the coating using pencils of different hardness grades, and the hardness of the coating was judged by the difficulty of scratching.

[0179] The method for testing the boiling-water standing cycle resistance is as follows: Under normal pressure, the substrate coated with the coating was placed in an oven and boiled at 100 °C for 12 h, and then taken out and left standing at room temperature. This process was one cycle; The coating was subjected to multiple boiling-water standing cycle tests until defects such as cracks or blisters appeared on the coating.

[0180] Table 1 Performance test results of the coatings of each example and comparative example

[0181]

[0182] As shown in Table 1, the coatings of Examples 1 to 5 were tested at a high temperature of 250 °C for more than 1500 h, and the coatings did not crack or peel off, indicating excellent high-temperature resistance; Tested in a humid and hot environment of 95% humidity and 50 °C for more than 1500 h, the coating did not crack or peel off, and the number of cycles of the boiling-water standing cycle resistance could reach more than 20 times, indicating excellent heat and humidity resistance; Tested in a neutral salt spray environment for more than 3500 h, the coating did not crack or peel off, indicating excellent corrosion resistance; The initial adhesion of the coating was all above 20 MPa, and the adhesion remained above 15 MPa after 20 boiling-water standing cycles, indicating that the coating had excellent adhesion.

[0183] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A high temperature resistant, heat and humidity resistant anticorrosion coating, characterized in that: include: A first component and a second component; The first component includes: 35 to 55 parts of silicone resin, 20 to 40 parts of functional filler, 5 to 15 parts of corrosion inhibitor, 5 to 15 parts of inorganic nanoparticles, 1 to 3 parts of additives and 5 to 15 parts of solvent; The second component includes: 1 to 5 parts of amine curing agent.

2. The coating according to claim 1, characterized in that The mass ratio of the first component to the second component is 100:(1-5).

3. The coating according to claim 1, characterized in that The functional filler includes: a combination of one or more of fluorphlogopite, mica iron oxide, silicon carbide, and boron nitride; Preferably, the particle size of the functional filler is 1 to 100 μm.

4. The coating according to claim 3, characterized in that The corrosion inhibitor comprises: a combination of one or more of red iron oxide, zinc phosphate, aluminum tripolyphosphate, molybdate or rare earth oxide; Preferably, the particle size of the corrosion inhibitor is 1 to 50 μm.

5. The coating according to claim 4, characterized in that: The inorganic nanoparticles include: a combination of one or more of nano silicon carbide, nano zinc oxide, nano zirconium oxide, and nano cerium oxide; Preferably, the particle size of the inorganic nanoparticles is 1 to 500 nm.

6. The coating according to claim 1, characterized in that The organic silicone resin includes methyl organic resin, phenyl organic silicone resin, fluorine-containing organic silicone resin, amino organic silicone resin, and epoxy organic silicone resin.

7. The coating according to any one of claims 1 to 6, characterized in that The solvent includes one or more of ethyl acetate, butyl acetate, xylene and PMA.

8. A method for preparing a high temperature resistant, heat and humidity resistant anticorrosive coating, characterized in that: For preparing the coating according to any one of claims 1 to 7, comprising: S1, weighing the silicone resin and the solvent according to the formula of the coating, and stirring and mixing; S2, adding functional fillers, corrosion inhibitors and inorganic nanoparticles to the dissolved silicone resin according to the formula, and stirring and mixing; S3, adding additives according to the formula, and stirring and dispersing; S4, grinding the dispersed mixture to a fineness of less than 40 μm to obtain a first component; S5, preparing an amine curing agent to obtain a second component.

9. The method according to claim 8, characterized in that In S1 and S2, the stirring speed is 400-800 rpm and the stirring time is 10-30 min; In S3, the stirring speed is 1000-1500 rpm, and the stirring time is 60-90 min.

10. A method for using the high temperature resistant, heat and humidity resistant, anticorrosive coating according to any one of claims 1 to 7, characterized in that: include: Add the second component to the first component in proportion, stir evenly and apply to the surface of the substrate; Curing at 180-210°C for 60-90 minutes forms a high temperature, moisture and heat resistant and anti-corrosion coating.

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