Vegetable oil-based polyurethane anticorrosive paint with high flash point, high temperature resistance and high-temperature salt mist resistance

Abstract

The invention relates to the technical field of anticorrosive coatings, and particularly discloses a vegetable oil-based polyurethane anticorrosive coating with high flash point, high temperature resistance and high temperature and salt mist resistance. The anticorrosive paint comprises the following raw materials: a component A and a component B, the component A comprises the following raw materials in parts by weight: 22-32 parts of modified vegetable oil polyol, 0.1-0.5 part of a catalyst, 6-16 parts of an anti-rust pigment, 5-20 parts of a coloring agent, 12-27 parts of a high-temperature-resistant inert filler, 0.5-5 parts of amino silane resin, 1-5 parts of an anti-settling agent, 12-22 parts of a high-flash-point mixed solvent, 1-3 parts of a high-temperature-resistant auxiliary agent, 2-5 parts of a salt-fog-resistant modifier and 0.5-2 parts of a multifunctional auxiliary agent; the modified vegetable oil polyol is prepared from the following raw materials: vegetable oil polyol, nano silicon dioxide and a silane coupling agent; the component B is prepared from the following raw materials in parts by weight: 100 parts of isocyanate and 5 to 10 parts of isocyanate modifier.

Description

Technical Field

[0001] This application relates to the technical field of anti-corrosion coatings, and in particular to a plant oil-based polyurethane anti-corrosion coating with high flash point, high temperature resistance, and high temperature salt spray resistance. Background Technology

[0002] Polyurethane materials are widely used in industrial and construction fields due to their excellent properties. However, traditional polyurethane production relies on petroleum resources. With the depletion of oil reserves and the intensification of environmental problems, bio-based polyurethane has become a development direction. Vegetable oil polyols, as an important source of bio-based polyols, have advantages such as abundant raw materials and low energy consumption. However, existing vegetable oil-based polyurethane anti-corrosion coatings have significant shortcomings in specific scenarios.

[0003] In industrial production, certain applications, such as high-temperature pipelines in petrochemical plants and high-temperature equipment on offshore platforms, require coatings with extremely high temperature resistance. Existing plant-oil-based polyurethane anticorrosion coatings are typically only usable within a temperature range of -20℃ to 120℃. When the ambient temperature exceeds 120℃, the coating is prone to softening and peeling, losing its anticorrosion effect. Furthermore, these scenarios often involve high-temperature salt spray environments, which accelerate the corrosion and aging of coatings. Existing coatings perform poorly in terms of high-temperature salt spray resistance, making it difficult to meet long-term usage requirements. Summary of the Invention

[0004] In order to improve the high temperature resistance and high temperature salt spray resistance of coatings, this application provides a plant oil-based polyurethane anticorrosive coating with high flash point, high temperature resistance and high temperature salt spray resistance.

[0005] Firstly, this application provides a high flash point, high temperature resistance, and high temperature salt spray resistance plant oil-based polyurethane anticorrosive coating, which adopts the following technical solution: A high flash point, high temperature resistance, and high temperature salt spray resistance plant oil-based polyurethane anticorrosive coating, wherein the raw materials of the anticorrosive coating include component A and component B; the raw materials of component A include the following components in parts by weight: 22-32 parts modified plant oil polyol, 0.1-0.5 parts catalyst, 6-16 parts anti-rust pigment, 5-20 parts colorant, 12-27 parts high temperature resistant inert filler, 0.5-5 parts aminosilane resin, 1-5 parts anti-settling agent, 12-22 parts high flash point mixed solvent, 1-3 parts high temperature resistant additive, 2-5 parts salt spray resistant modifier, and 0.5-2 parts multifunctional additive; the raw materials of the modified plant oil polyol include plant oil polyol, nano silica, and silane coupling agent; the raw materials of component B include the following components in parts by weight: 100 parts isocyanate and 5-10 parts isocyanate modifier.

[0006] By adopting the above technical solution, vegetable oil polyols are modified using nano-silica and silane coupling agents. Nano-silica can fill the internal pores of the coating, improving its density and hardness. Silane coupling agents can improve the compatibility between nano-silica and vegetable oil polyols, enhancing interfacial bonding, thereby significantly improving the high-temperature resistance of the coating and enabling it to be used stably in the range of -20℃ to 200℃. Furthermore, by combining high-temperature resistant inert fillers, high-temperature resistant additives, and salt spray resistant modifiers, the high-temperature resistance and high-temperature salt spray resistance of the final coating are further improved.

[0007] In one specific implementation, the method for preparing the modified vegetable oil polyol includes the following steps: Add 3%-8% by mass of nano-silica and 2%-5% by mass of silane coupling agent to vegetable oil polyol, stir and mix evenly, first in an oil bath at 80-120℃ for 10-20 min, then in an oil bath at 145-155℃ for 65-85 min to obtain modified vegetable oil polyol; the modified vegetable oil polyol has a hydroxyl value of 280-430 mgKOH / g, a viscosity of 550-850 mPa・s, and an epoxy value of 0.2-0.9.

[0008] By adopting the above technical solution, nano-silica and silane coupling agent are added to vegetable oil polyol, followed by hydrolysis in a low-temperature oil bath and condensation in a high-temperature oil bath to obtain modified vegetable oil polyol.

[0009] In one specific implementation, the rust-preventive pigment includes one or more of strontium yellow phosphate, high-purity zinc phosphate, nano zinc oxide, and aluminum tripolyphosphate.

[0010] In one specific implementation, the high-temperature resistant inert filler includes one or more of calcined kaolin, silicon carbide, and boron nitride.

[0011] In one specific implementation, the high-temperature resistant additive includes one or more of nano-zirconia and nano-cerium oxide.

[0012] In one specific implementation, the high flash point mixed solvent comprises a mixture of mixed diester, ethylene glycol diacetate, and propylene glycol diacetate, wherein the weight ratio of the mixed diester, ethylene glycol diacetate, and propylene glycol diacetate is 2:1:(1-3).

[0013] By adopting the above technical solution, a high flash point mixed solvent composed of mixed diesters, ethylene glycol diacetate, and propylene glycol diacetate in a specific ratio is selected, with a flash point (closed cup) of not less than 60°C. Compared with the low flash point solvents commonly used in existing coatings, this solvent can significantly reduce safety hazards in flammable and explosive industrial environments and improve the safety of coating use. At the same time, because the flash point (closed cup) is >60°C, this product is a non-hazardous chemical and can be transported and stored as general cargo, effectively reducing the transportation and storage costs of the product.

[0014] In one specific implementation, the salt spray resistant modifier comprises polyetheramine.

[0015] By adopting the above technical solution, polyetheramine is selected as the salt spray resistant modifier. The amino groups in polyetheramine molecules can react chemically with the metal surface to form a strong protective film. At the same time, its polyether segments have good flexibility and water resistance, which can effectively prevent high-temperature salt spray from corroding the metal substrate, greatly improve the high-temperature salt spray resistance of the coating, and meet the long-term anti-corrosion requirements of special scenarios.

[0016] In one specific embodiment, the isocyanate comprises one or more of diphenylmethane diisocyanate polymer, hexamethylene diisocyanate trimer, isoflurone diisocyanate, and polymethylene polyphenyl isocyanate; the isocyanate modifier comprises polycarbodiimide.

[0017] By adopting the above technical solution, polycarbodiimide is added to isocyanate as a modifier. Polycarbodiimide can react with the active groups in isocyanate to form a more stable chemical structure, improve the crosslinking density and chemical corrosion resistance of the coating, and further enhance the overall performance of the coating.

[0018] Secondly, this application provides a method for preparing a high flash point, high temperature resistant, and high temperature salt spray resistant vegetable oil-based polyurethane anticorrosive coating, which adopts the following technical solution: A method for preparing a plant oil-based polyurethane anticorrosive coating with high flash point, high temperature resistance, and high temperature salt spray resistance includes the following steps: Preparation of Component A: First, the modified vegetable oil polyol, catalyst, rust-preventive pigment, high-temperature resistant inert filler, aminosilane resin, anti-settling agent, high flash point mixed solvent, high-temperature resistant additive, salt spray resistant modifier, and multifunctional additive are dispersed by high-speed stirring for 15-30 minutes. Then, the product enters the grinding process until the fineness is less than 20μm. Next, the product enters the color matching process, where colorant is added for color matching, and the color difference value ΔE is controlled to not exceed 2%. Finally, high flash point mixed solvent is added to adjust the viscosity, and the viscosity of the product is adjusted to less than 160s in the Forecast cup 4. Filtering yields Component A. Preparation of component B: Mix isocyanate and isocyanate modifier, stir and react at 60-80℃ for 1-2 hours, and then dehydrate under vacuum to obtain component B.

[0019] By adopting the above technical solution, the raw material of component A is first stirred and dispersed, then ground, then colored, and finally a high flash point mixed solvent is added to adjust the viscosity. After filtration, component A is obtained. Isocyanate and isocyanate modifier are mixed, heated and stirred to react, and then vacuum dehydrated to obtain component B, thus completing the preparation of anti-corrosion coating.

[0020] Thirdly, the application method of the high flash point, high temperature resistance, and high temperature salt spray resistance plant oil-based polyurethane anticorrosive coating provided in this application adopts the following technical solution: A method for applying a high flash point, high temperature resistant, and high temperature salt spray resistant plant oil-based polyurethane anticorrosive coating includes the following steps: The components A and B are mixed at a mass ratio of (5-15):1 for 5-15 minutes to obtain a plant oil-based polyurethane anti-corrosion coating.

[0021] The coating obtained by adopting the above technical solution can be applied to corrosion protection scenarios in industrial fields such as steel structures, process pipelines, storage tanks, ladder platforms, high-temperature pipelines in petrochemical industry, and high-temperature equipment on marine platforms, with an applicable temperature range of -20℃ to 200℃.

[0022] In summary, this application includes at least one of the following beneficial technical effects: In this application, nano-silica and silane coupling agents are used to modify vegetable oil polyols. Nano-silica can fill the internal pores of the coating, improving its density and hardness. Silane coupling agents can improve the compatibility between nano-silica and vegetable oil polyols, enhance interfacial bonding, and thus significantly improve the high-temperature resistance of the coating, enabling it to be used stably in the range of -20℃ to 200℃. Furthermore, the combination of high-temperature resistant inert fillers, high-temperature resistant additives, and salt spray resistant modifiers further enhances the high-temperature resistance and high-temperature salt spray resistance of the final coating. In this application, the salt spray resistant modifier is polyetheramine. The amino groups in the polyetheramine molecule can react chemically with the metal surface to form a strong protective film. At the same time, its polyether segments have good flexibility and water resistance, which can effectively prevent high temperature salt spray from corroding the metal substrate, greatly improve the high temperature salt spray resistance of the coating, and meet the long-term anti-corrosion requirements of special scenarios. In this application, polycarbodiimide is added to isocyanate as a modifier. Polycarbodiimide can react with the active groups in isocyanate to form a more stable chemical structure, improve the crosslinking density and chemical corrosion resistance of the coating, and further enhance the overall performance of the coating. The anti-corrosion coating in this application can be applied to anti-corrosion scenarios in industrial fields such as steel structures, process pipelines, storage tanks, ladder platforms, high-temperature pipelines in petrochemical industries, and high-temperature equipment on marine platforms, with an applicable temperature range of -20℃ to 200℃. Detailed Implementation

[0023] The present application will be further described in detail below with reference to the embodiments.

[0024] All raw materials used in the examples are commercially available. The vegetable oils include, but are not limited to, mixtures of one or more of cottonseed oil, palm oil, castor oil, and soybean oil; the coloring powders include, but are not limited to, mixtures of one or more of titanium dioxide, iron oxide red, phthalocyanine blue, and carbon black; the anti-settling agents include, but are not limited to, mixtures of one or two of bentonite and fumed silica; the multifunctional additives include, but are not limited to, at least two of defoamers, dispersants, leveling agents, and antioxidants; the isocyanates include, but are not limited to, mixtures of one or more of diphenylmethane diisocyanate polymers, hexamethylene diisocyanate trimers, isoflurane diisocyanate, and polymethylene polyphenyl isocyanate; the imidazole / pyridine quaternary ammonium salt ionic liquid is Basionics LQ 01; the defoamer is TEGO Foamex 830; the dispersant is TEGO Dispers 656; the leveling agent is Flow 370; and the antioxidant is IRGANOX 1010. Preparation Example

[0025] Preparation Example 1 Preparation Example 1 provides a method for preparing plant oil polyols, comprising the following steps: Vegetable oil was reacted with ethylene and Grubbs 2nd generation catalyst in a reactor to obtain vegetable oil A with suspended chains removed; wherein the vegetable oil was cottonseed oil, and the molar ratio of double bonds in the vegetable oil, ethylene and Grubbs 2nd generation catalyst was 1:2:0.05; the reaction temperature was 60℃ and the reaction time was 3h. Vegetable oil A was reacted with N-bromosuccinimide and dimethyl sulfoxide in a reaction vessel to obtain product A; wherein the molar ratio of vegetable oil A, N-bromosuccinimide and dimethyl sulfoxide was 1:1.5:3; the reaction temperature was 50℃ and the reaction time was 4h. Product A was reacted with diethyl ether and 1,8-diazabicycloundec-7-ene in a reaction vessel to obtain product B; wherein the molar ratio of product A, diethyl ether, and 1,8-diazabicycloundec-7-ene was 1:1.15:0.04; the reaction temperature was room temperature, and the reaction time was 24 h. Product B was used as component A, and a mixture of ethyl 3-oxopropionate and toluene was also used as component B. Both were simultaneously pumped into the first micro-mixer of a microchannel modular reaction device for mixing. After mixing, the mixture was pumped into the first microreactor for reaction to obtain vegetable oil polyol A. The molar ratio of ethyl 3-oxopropionate to toluene was 2:1.27; the molar ratio of product B in component A to ethyl 3-oxopropionate in component B was 1:2; the flow rate of component A into the microchannel modular reaction device was 0.8 mL / min, and the flow rate of component B into the microchannel modular reaction device was 4.5 mL / min. The reaction temperature in the first microreactor was 110 °C, and the reaction residence time was 6.5 min. Vegetable oil polyol A and Pd / C catalyst were hydrogenated in a reactor for 10.5 h under continuous hydrogen purging and pressure of 1 MPa. The mixture was then washed with water to obtain vegetable oil polyol. The molar ratio of vegetable oil polyol A to Pd / C catalyst was 1:0.45.

[0026] Preparation Example 2 The difference between Preparation Example 2 and Preparation Example 1 is that vegetable oil was reacted with ethylene and Grubbs 2 catalyst in a reactor to obtain vegetable oil A with the suspension chain removed; wherein the vegetable oil was soybean oil, and the reaction molar ratio of double bonds in the vegetable oil, ethylene and Grubbs 2 catalyst was 1:2:0.05; the reaction temperature was 60°C and the reaction time was 3h; the remaining steps were the same as those in Preparation Example 1.

[0027] Preparation Example 3 Preparation Example 3 provides a method for preparing modified vegetable oil polyols, comprising the following steps: 5% by mass of nano-silica and 3% by mass of silane coupling agent were added to the vegetable oil polyol in Preparation Example 1. The mixture was stirred and stirred until homogeneous. The mixture was first placed in an oil bath at 100°C for 15 min, and then placed in an oil bath at 150°C for 75 min to obtain the modified vegetable oil polyol. The modified vegetable oil polyol had a hydroxyl value of 320 mg KOH / g, a viscosity of 650 mPa·s, and an epoxy value of 0.5. The silane coupling agent was KH-550.

[0028] Preparation Example 4 Preparation Example 4 provides a method for preparing modified vegetable oil polyols, comprising the following steps: 3% by mass of nano-silica and 2% by mass of silane coupling agent were added to the vegetable oil polyol in Preparation Example 2. The mixture was stirred and mixed evenly. The mixture was first placed in an oil bath at 100°C for 15 min, and then placed in an oil bath at 150°C for 75 min to obtain the modified vegetable oil polyol. The modified vegetable oil polyol had a hydroxyl value of 280 mg KOH / g, a viscosity of 550 mPa·s, and an epoxy value of 0.2. The silane coupling agent was KH-560.

[0029] Preparation Example 5 Preparation Example 5 provides a method for preparing modified vegetable oil polyols, comprising the following steps: 8% by mass of nano-silica and 5% by mass of silane coupling agent were added to the vegetable oil polyol in Preparation Example 1. The mixture was stirred and mixed evenly. The mixture was first placed in an oil bath at 100°C for 15 min, and then placed in an oil bath at 150°C for 75 min to obtain the modified vegetable oil polyol. The modified vegetable oil polyol had a hydroxyl value of 430 mg KOH / g, a viscosity of 850 mPa·s, and an epoxy value of 0.9. The silane coupling agent was KH-570.

[0030] Preparation Example 6 The difference between Preparation Example 6 and Preparation Example 3 is that 1% by mass of nano-silica and 1% by mass of silane coupling agent were added to the vegetable oil polyol in Preparation Example 1, and the mixture was stirred and mixed evenly. The mixture was first placed in an oil bath at 100°C for 15 minutes, and then placed in an oil bath at 150°C for 75 minutes to obtain the modified vegetable oil polyol. The remaining steps were the same as those in Preparation Example 3.

[0031] Preparation Example 7 The difference between Preparation Example 7 and Preparation Example 3 is that 10% by mass of nano-silica and 7% by mass of silane coupling agent were added to the vegetable oil polyol in Preparation Example 1, and the mixture was stirred and mixed evenly. The mixture was first placed in an oil bath at 100°C for 15 minutes, and then placed in an oil bath at 150°C for 75 minutes to obtain the modified vegetable oil polyol. The remaining steps were the same as those in Preparation Example 3. Example

[0032] Example 1 Example 1 provides a method for preparing a vegetable oil-based polyurethane anticorrosive coating with high flash point, high temperature resistance, and high temperature salt spray resistance, comprising the following steps: Preparation of Component A: First, 27 kg of modified vegetable oil polyol, 0.2 kg of catalyst, 11 kg of rust-preventive pigment, 19 kg of high-temperature resistant inert filler, 4 kg of aminosilane resin, 4 kg of anti-settling agent, 17 kg of high flash point mixed solvent, 2 kg of high-temperature resistant additive, 3.5 kg of salt spray resistant modifier, and 1.2 kg of multifunctional additive from Preparation Example 3 were dispersed by high-speed stirring at 1500 rpm for 20 min. Then, the mixture was ground, with the outlet temperature of the sand mill controlled below 50℃, until the fineness was less than 20 μm. Next, 15 kg of colorant was added for color adjustment, controlling the color difference ΔE to not exceed 2%. Finally, the high flash point mixed solvent was added. Solvent viscosity was adjusted to a viscosity less than 160s in a Ford cup 4, followed by filtration to obtain component A. The catalyst was an imidazole / pyridine quaternary ammonium salt ionic liquid. The rust-preventive pigment was a mixture of strontium yellow phosphate and high-purity zinc phosphate in a 1:2 mass ratio. The high-temperature resistant inert filler was a mixture of calcined kaolin and silicon carbide in a 1:1 mass ratio. The anti-settling agent was bentonite. The high flash point mixed solvent was a mixture of mixed diesters, ethylene glycol diacetate, and propylene glycol diacetate in a 2:1:2 mass ratio, with a flash point of 90℃. The high-temperature resistant additive was nano-zirconia. The salt spray resistant modifier was polyetheramine. The multifunctional additive was a mixture of defoamer and dispersant in a 1:1 mass ratio. The colorant was titanium dioxide. Preparation of Component B: 100 kg of isocyanate and 7 kg of isocyanate modifier are mixed and stirred at 70 °C for 1.5 h, and then dehydrated under vacuum to obtain Component B; wherein the isocyanate is a diphenylmethane diisocyanate polymer; and the isocyanate modifier is polycarbodiimide.

[0033] Example 2 Example 2 provides a method for preparing a vegetable oil-based polyurethane anticorrosive coating with high flash point, high temperature resistance, and high temperature salt spray resistance, comprising the following steps: Preparation of Component A: First, 22 kg of modified vegetable oil polyol, 0.5 kg of catalyst, 6 kg of rust-preventive pigment, 12 kg of high-temperature resistant inert filler, 5 kg of aminosilane resin, 1 kg of anti-settling agent, 12 kg of high flash point mixed solvent, 1 kg of high-temperature resistant additive, 2 kg of salt spray resistant modifier, and 0.5 kg of multifunctional additive from Preparation Example 4 are dispersed by high-speed stirring at 1500 rpm for 15 min. Then, the mixture proceeds to the grinding process, controlling the outlet temperature of the sand mill to below 50℃, grinding until the fineness is less than 20 μm. Next, the mixture proceeds to the color-matching process, adding 20 kg of colorant for color matching, controlling the color difference ΔE to not exceed 2%. Finally, the mixture is further... The viscosity of the product was adjusted using a high flash point mixed solvent to a viscosity less than 160s in a Ford cup 4, followed by filtration to obtain component A. The catalyst was an imidazole / pyridine quaternary ammonium salt ionic liquid. The rust-preventive pigment was a mixture of nano-zinc oxide and aluminum tripolyphosphate in a 1:2 mass ratio. The high-temperature resistant inert filler was silicon carbide. The anti-settling agent was fumed silica. The high flash point mixed solvent was a mixture of mixed diesters, ethylene glycol diacetate, and propylene glycol diacetate in a 2:1:1 mass ratio, with a flash point of 91℃. The high-temperature resistant additive was nano-cerium oxide. The salt spray resistant modifier was polyetheramine. The multifunctional additive was a mixture of leveling agent and antioxidant in a 1:1 mass ratio. The colorant was iron oxide red pigment. Preparation of Component B: Mix 100 kg of isocyanate and 5 kg of isocyanate modifier, stir and react at 60 °C for 1 h, and then dehydrate under vacuum to obtain Component B; wherein the isocyanate is hexamethylene diisocyanate trimer; and the isocyanate modifier is polycarbodiimide.

[0034] Example 3 Example 3 provides a method for preparing a vegetable oil-based polyurethane anticorrosive coating with high flash point, high temperature resistance, and high temperature salt spray resistance, comprising the following steps: Component A Preparation: First, 32 kg of modified vegetable oil polyol, 0.1 kg of catalyst, 16 kg of rust-preventive pigment, 27 kg of high-temperature resistant inert filler, 0.5 kg of aminosilane resin, 5 kg of anti-settling agent, 22 kg of high flash point mixed solvent, 3 kg of high-temperature resistant additive, 5 kg of salt spray resistant modifier, and 2 kg of multifunctional additive from Preparation Example 5 are dispersed at 1500 rpm for 30 minutes by high-speed stirring. Then, the mixture proceeds to the grinding process, controlling the outlet temperature of the sand mill to below 50℃, grinding until the fineness is less than 20 μm. Next, the mixture proceeds to the color-matching process, adding 5 kg of colorant for color matching, controlling the color difference ΔE to not exceed 2%. Finally, the high flash point mixed solvent is added to adjust the viscosity, and the product is then... The viscosity was adjusted to less than 160s in the Forecast cup 4 test, and then filtered to obtain component A. The catalyst was an imidazole / pyridine quaternary ammonium salt ionic liquid. The rust-preventive pigment was a mixture of strontium yellow phosphate, high-purity zinc phosphate, and nano zinc oxide in a mass ratio of 1:2:3. The high-temperature resistant inert filler was boron nitride. The anti-settling agent was bentonite. The high-flash-point mixed solvent was a mixture of mixed diesters, ethylene glycol diacetate, and propylene glycol diacetate in a mass ratio of 2:1:3, with a flash point of 89.5℃. The high-temperature resistant additive was a mixture of nano zirconium oxide and nano cerium oxide in a mass ratio of 1:1. The salt spray resistant modifier was polyetheramine. The multifunctional additive was a mixture of defoamer, dispersant, and leveling agent in a mass ratio of 1:1:1. The colorant was colored carbon black powder. Preparation of Component B: Mix 100 kg of isocyanate and 10 kg of isocyanate modifier, stir and react at 80 °C for 2 h, and then dehydrate under vacuum to obtain Component B; wherein the isocyanate is isoflurane diisocyanate; and the isocyanate modifier is polycarbodiimide.

[0035] Example 4 The difference between Example 4 and Example 1 is that, in the preparation of component A: 27 kg of modified vegetable oil polyol, 0.2 kg of catalyst, 11 kg of rust-preventive pigment, 19 kg of high-temperature resistant inert filler, 4 kg of aminosilane resin, 4 kg of anti-settling agent, 17 kg of high flash point mixed solvent, 2 kg of high-temperature resistant additive, 3.5 kg of salt spray resistant modifier, and 1.2 kg of multifunctional additive from Example 6 are first dispersed by high-speed stirring at 1500 rpm for 20 min. Then, the mixture is ground, with the outlet temperature of the sand mill controlled below 50°C, until the fineness is less than 20 μm. Next, the mixture is colored, with 15 kg of colorant added to adjust the color, controlling the color difference ΔE to not exceed 2%. Finally, the high flash point mixed solvent is added to adjust the viscosity, adjusting the product viscosity to less than 160 s in the Forecast cup 4. The mixture is then filtered to obtain component A. The remaining steps are the same as in Example 1.

[0036] Example 5 The difference between Example 5 and Example 1 is that, in the preparation of component A: 27 kg of modified vegetable oil polyol, 0.2 kg of catalyst, 11 kg of rust-preventive pigment, 19 kg of high-temperature resistant inert filler, 4 kg of aminosilane resin, 4 kg of anti-settling agent, 17 kg of high flash point mixed solvent, 2 kg of high-temperature resistant additive, 3.5 kg of salt spray resistant modifier, and 1.2 kg of multifunctional additive from Example 7 are first dispersed by high-speed stirring at 1500 rpm for 20 min. Then, the mixture is ground, with the outlet temperature of the sand mill controlled below 50°C, until the fineness is less than 20 μm. Next, the mixture is colored, with 15 kg of colorant added to adjust the color, controlling the color difference ΔE to not exceed 2%. Finally, the high flash point mixed solvent is added to adjust the viscosity, adjusting the product viscosity to less than 160 s in the Forecast cup 4. The mixture is then filtered to obtain component A. The remaining steps are the same as in Example 1. Comparative Example

[0037] Comparative Example 1 The difference between Comparative Example 1 and Example 1 is that, in the preparation of Component A: 27 kg of vegetable oil polyol, 0.2 kg of catalyst, 11 kg of rust-preventive pigment, 19 kg of high-temperature resistant inert filler, 4 kg of aminosilane resin, 4 kg of anti-settling agent, 17 kg of high flash point mixed solvent, 2 kg of high-temperature resistant additive, 3.5 kg of salt spray resistant modifier, and 1.2 kg of multifunctional additive from Example 1 were first dispersed by high-speed stirring at 1500 rpm for 20 min. Then, the mixture was ground, with the outlet temperature of the sand mill controlled below 50°C, until the fineness was less than 20 μm. Next, the mixture was colored, with 15 kg of colorant added to adjust the color, controlling the color difference ΔE to not exceed 2%. Finally, the high flash point mixed solvent was added to adjust the viscosity, adjusting the product viscosity to less than 160 s in the Forecast cup 4. The mixture was then filtered to obtain Component A. The remaining steps were the same as in Example 1.

[0038] Comparative Example 2 The difference between Comparative Example 2 and Example 1 is that, in the preparation of Component A: 27 kg of vegetable oil polyol, 0.2 kg of catalyst, 11 kg of rust-preventive pigment, 19 kg of high-temperature resistant inert filler, 4 kg of aminosilane resin, 4 kg of anti-settling agent, 17 kg of high flash point mixed solvent, 2 kg of high-temperature resistant additive, 3.5 kg of salt spray resistant modifier, and 1.2 kg of multifunctional additive from Example 2 were first dispersed at 1500 rpm for 20 min by high-speed stirring. Then, the mixture was ground, with the outlet temperature of the sand mill controlled below 50°C, until the fineness was less than 20 μm. Next, the mixture was colored, with 15 kg of colorant added to adjust the color, controlling the color difference ΔE to not exceed 2%. Finally, the high flash point mixed solvent was added to adjust the viscosity, adjusting the product viscosity to less than 160 s in the Forecast cup 4. The mixture was then filtered to obtain Component A. The remaining steps were the same as in Example 1. Application examples

[0039] Application Example 1 Application Example 1 provides a method for using a plant-oil-based polyurethane anticorrosive coating with high flash point, high temperature resistance, and high temperature salt spray resistance, including the following steps: Component A and component B from Example 1 were mixed at a mass ratio of 10:1 for 10 minutes to obtain a plant oil-based polyurethane anti-corrosion coating.

[0040] Application Example 2 Application Example 2 provides a method for using a plant oil-based polyurethane anticorrosive coating with high flash point, high temperature resistance, and high temperature salt spray resistance, including the following steps: Component A and component B from Example 2 were mixed at a mass ratio of 10:1 for 10 minutes to obtain a plant oil-based polyurethane anti-corrosion coating.

[0041] Application Example 3 Application Example 3 provides a method for using a plant oil-based polyurethane anticorrosive coating with high flash point, high temperature resistance, and high temperature salt spray resistance, including the following steps: Component A from Example 3 and component B from Example 3 were mixed at a mass ratio of 10:1 for 10 minutes to obtain a plant oil-based polyurethane anti-corrosion coating.

[0042] Application Example 4 Application Example 4 provides a method for using a plant-oil-based polyurethane anticorrosive coating with high flash point, high temperature resistance, and high temperature salt spray resistance, including the following steps: Component A from Example 4 and component B from Example 2 were mixed at a mass ratio of 10:1 for 10 minutes to obtain a plant oil-based polyurethane anti-corrosion coating.

[0043] Application Example 5 Application Example 5 provides a method for using a plant-oil-based polyurethane anticorrosive coating with high flash point, high temperature resistance, and high temperature salt spray resistance, including the following steps: Component A from Example 5 and component B from Example 5 were mixed at a mass ratio of 10:1 for 10 minutes to obtain a plant oil-based polyurethane anti-corrosion coating. Comparative Application Examples

[0044] Comparative Application Example 1 Comparative application example 1 is the Laoren brand Pioneer Shield epoxy zinc-rich primer 650.

[0045] Comparative Application Example 2 Comparative Application Example 2 provides a method for using a plant-based polyurethane anticorrosive coating with high flash point, high temperature resistance, and high temperature salt spray resistance, including the following steps: Component A and component B of Comparative Example 1 were mixed at a mass ratio of 10:1 and stirred for 10 minutes to obtain a plant oil-based polyurethane anti-corrosion coating.

[0046] Comparative Application Example 3 Comparative application example 3 provides a method for using a plant oil-based polyurethane anticorrosive coating with high flash point, high temperature resistance, and high temperature salt spray resistance, including the following steps: Component A and component B of Comparative Example 2 were mixed at a mass ratio of 10:1 and stirred for 10 minutes to obtain a plant oil-based polyurethane anti-corrosion coating. Performance testing experiment

[0047] Performance Testing: The coatings from each application example and the comparative application example were sprayed onto the steel plate substrate. Each coat was applied once, resulting in a dry film thickness of 90 μm. After 7 days, performance tests were conducted in a laboratory environment, measuring non-volatile matter content, VOC content, adhesion (pull-off method), flash point, high-temperature resistance, acid resistance, alkali resistance, salt water resistance, high-temperature salt spray resistance, neutral salt spray resistance, and biochar content. Specifically, high-temperature resistance was tested at 200℃ for 24 hours; acid resistance was tested with 50 g / L H₂SO₄; alkali resistance was tested with 20 g / L NaOH; salt water resistance was tested with a 3% NaCl solution; and high-temperature salt spray resistance was tested at 80℃ with a 5% NaCl solution for 1000 hours to check for any abnormalities.

[0048] Table 1 Basic performance test results

[0049] Table 2. Results of high temperature resistance performance tests

[0050] Combining application examples 1-3 and comparative application example 1, it can be seen that the plant oil-based polyurethane anticorrosive coating with high flash point, high temperature resistance and high temperature salt spray resistance obtained in this application has significantly increased non-volatile matter content, reduced VOC content, significantly improved adhesion, greatly increased flash point, excellent high temperature resistance and high temperature salt spray resistance, and other indicators also meet or even exceed those of existing similar products.

[0051] Combining Application Example 1 and Comparative Application Examples 2-3, the coating in Application Example 1 exhibits the best high-temperature resistance and high-temperature salt spray resistance. This demonstrates that when preparing component A, modified vegetable oil polyols are selected, and nano-silica and silane coupling agents are used to modify the vegetable oil polyols. Nano-silica can fill the internal pores of the coating, improving its density and hardness. Silane coupling agents can improve the compatibility between nano-silica and vegetable oil polyols, enhancing interfacial bonding, thereby significantly improving the coating's high-temperature resistance and high-temperature salt spray resistance.

[0052] Based on Application Examples 1-5, the coatings in Application Examples 1-3 exhibited good high-temperature resistance and high-temperature salt spray resistance. This indicates that when preparing modified vegetable oil polyols, the preferred addition amount of nano-silica is 3%-8%, and the preferred addition amount of silane coupling agent is 2%-5%. This results in a modified vegetable oil polyol with superior performance, thereby improving the performance of the final coating.

[0053] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A high flash point, high temperature and high temperature salt spray resistant, plant oil based polyurethane anticorrosive coating characterized in that: The raw materials of the anticorrosive paint include A component and B component; the raw materials of the A component include the following components in parts by weight: modified vegetable oil polyol 22-32 parts, catalyst 0.1-0.5 parts, anti-rust pigment 6-16 parts, colorant 5-20 parts, high-temperature-resistant inert filler 12-27 parts, amino silane resin 0.5-5 parts, anti-settling agent 1-5 parts, high-flash-point mixed solvent 12-22 parts, high-temperature-resistant additive 1-3 parts, salt mist-resistant modifier 2-5 parts, multifunctional additive 0.5-2 parts; the raw materials of the modified vegetable oil polyol include vegetable oil polyol, nano-silicon dioxide and silane coupling agent; the raw materials of the B component include the following components in parts by weight: isocyanate 100 parts, isocyanate modifier 5-10 parts.

2. The high flash point, high temperature and high temperature salt spray resistant, plant oil based polyurethane anticorrosive coating as claimed in claim 1, wherein: The preparation method of the modified vegetable oil polyol includes the following steps: Nano-silicon dioxide with a mass fraction of 3%-8% and silane coupling agent with a mass fraction of 2%-5% are added to the vegetable oil polyol, and then stirred and mixed uniformly; oil bath is carried out at 80-120 ℃ for 10-20 min, and then oil bath is carried out at 145-155 ℃ for 65-85 min to obtain the modified vegetable oil polyol; the modified vegetable oil polyol has a hydroxyl value of 280-430 mgKOH / g, a viscosity of 550-850 mPa·s and an epoxy value of 0.2-0.

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3. The high flash point, high temperature and high temperature salt spray resistant, plant oil based polyurethane anticorrosive coating as claimed in claim 1, wherein: The anti-rust pigment includes one or more of strontium phosphate yellow, high-purity zinc phosphate, nano-zinc oxide and aluminum tripolyphosphate.

4. The high flash point, high temperature and high temperature salt spray resistant, plant oil based polyurethane anticorrosive coating as claimed in claim 1, wherein: The high-temperature-resistant inert filler includes one or more of calcined kaolin, silicon carbide and boron nitride.

5. The high flash point, high temperature and high temperature salt spray resistant, plant oil based polyurethane anticorrosive coating as claimed in claim 1, wherein: The high-temperature-resistant additive includes one or more of nano-zirconium oxide and nano-cerium oxide.

6. The high flash point, high temperature and high temperature salt spray resistant, plant oil based polyurethane anticorrosive coating as claimed in claim 1, wherein: The high-flash-point mixed solvent includes a mixture of mixed dibasic acid ester, ethylene glycol diacetate and propylene glycol diacetate, and the weight ratio of the mixed dibasic acid ester, the ethylene glycol diacetate and the propylene glycol diacetate is 2:1:(1-3).

7. The high flash point, high temperature and high temperature salt spray resistant, plant oil based polyurethane anticorrosive coating as claimed in claim 1, wherein: The salt mist-resistant modifier includes polyether amine.

8. The high flash point, high temperature and high temperature salt spray resistant, plant oil based polyurethane anticorrosive coating as claimed in claim 1, wherein: The isocyanate includes one or more of diphenylmethane diisocyanate polymer, hexamethylene diisocyanate trimer, isophorone diisocyanate and polymethylene polyphenyl isocyanate; and the isocyanate modifier includes polycarbodiimide.

9. A process for the preparation of high flash point, high temperature and high temperature salt spray resistant, plant oil based polyurethane anticorrosive coating as claimed in any one of claims 1 to 8, characterized by: The method includes the following steps: A component preparation: the modified vegetable oil polyol, the catalyst, the anti-rust pigment, the high-temperature-resistant inert filler, the amino silane resin, the anti-settling agent, the high-flash-point mixed solvent, the high-temperature-resistant additive, the salt mist-resistant modifier and the multifunctional additive are first stirred and dispersed at high speed for 15-30 min, and then enter the grinding process, and are ground until the fineness is less than 20 μm; then the colorant is added to control the color difference value ΔE to be not more than 2%, and finally the high-flash-point mixed solvent is added to adjust the viscosity, and the product viscosity is adjusted to be less than 160 s in the No. 4 cup, and then the A component is obtained after filtration; B component preparation: the isocyanate and the isocyanate modifier are mixed and stirred to react at 60-80 ℃ for 1-2 h, and then vacuum dehydration is carried out to obtain the B component.

10. A method of using the high flash point, high temperature and high temperature salt spray resistant, plant oil based polyurethane anticorrosive coating as claimed in any one of claims 1 to 8, characterized in that: The method includes the following steps: The A component and the B component are mixed in a mass ratio of (5-15):1, and mixed and stirred for 5-15 min to obtain the plant oil-based polyurethane anticorrosive coating.

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