Chemical anti-corrosion paint and formula thereof

Abstract

The invention discloses chemical anti-corrosion paint and a formula thereof, and belongs to the technical field of anti-corrosion paint. The paint comprises the following components in percentage by weight: 2-6% of an ionic liquid corrosion inhibitor, 25-35% of polyether modified epoxy resin, 3-7% of a graphene nano blocking agent, 6-10% of self-repairing microcapsules, 1-3% of a dispersing aid, 1-5% of a heat-resistant oxidation component, 2-4% of a toughening agent, 5-15% of an oily substrate component and the balance of an organic solvent. By adopting the synergistic effect of the multifunctional anti-corrosion components and introducing the ionic liquid corrosion inhibitor and nanofiller composite material, corrosion of a corrosive medium to a metal substrate is effectively blocked, the corrosion resistance of a coating is improved, the service life of the coating is prolonged, and the anti-corrosion paint is remarkably superior to that of traditional anti-corrosion paint.

Description

Technical Field

[0001] The present invention relates to the technical field of anticorrosive paints, and more specifically, to an anticorrosive paint for chemical industry and its formulation. Background Art

[0002] In the fields of chemical industry, petrochemical industry, metallurgy, ships, and heavy industrial equipment, metal structural components are generally in harsh environments such as high temperature, high humidity, high salt, or strong acids and bases, and are extremely prone to corrosion, seriously affecting the service life and operation safety of equipment. As one of the most common, economical, and effective metal protection means, anticorrosive paints play an important role in the industrial protection system due to their convenient construction and strong adaptability.

[0003] Traditional anticorrosive paints mainly rely on physically shielding resins (such as epoxy resins, polyurethane resins, etc.) and anticorrosive fillers such as zinc powder and chromates to build a protection barrier to block corrosive media. However, such paints have various problems during long-term service: on the one hand, their barrier ability is limited and they are prone to failure when facing microcracks or stress damage; on the other hand, chromium-containing or heavy metal fillers have obvious environmental pollution and health hazards and have gradually been restricted by environmental protection regulations in many countries.

[0004] In addition, as the operating environment of industrial equipment becomes more complex, paints need to simultaneously possess excellent chemical corrosion resistance, self-healing ability, mechanical strength, and environmental protection performance. A single shielding mechanism is difficult to meet the current development requirements of both "high performance + green environmental protection". Therefore, how to improve the comprehensive performance of anticorrosive paints under complex working conditions has become the core issue in the development of current protective coating technologies.

[0005] In recent years, the introduction of functional materials has provided a new idea for anticorrosive paints. For example, ionic liquid-based corrosion inhibitors have low volatility, good thermal stability, and selective adsorption ability for metals, and can effectively delay the electrochemical corrosion of metals; nanosheet materials such as graphene and MXene can build a dense shielding structure, significantly improving the barrier performance of the coating; microcapsule technology endows the coating with "self-healing" ability, and can release active substances for self-repair when microcracks occur, extending the service life of the coating.

[0006] At the same time, driven by environmental protection, water-based and anti-VOC emissions have also become important directions for the development of anticorrosive paints. Developing a chemical industry-specific anticorrosive paint formulation that integrates multiple protection mechanisms, has long-term anticorrosion performance, and is environmentally friendly is of great significance for improving the independent technology level of industrial protective coatings in China and ensuring the safe operation of major equipment. Summary of the Invention

[0007] The purpose of the present invention is to provide an anticorrosive paint for chemical industry and its formulation to solve the problems raised in the background art.

[0008] An anti-corrosive paint for chemical industry, the paint comprises the following components by weight percentage:

[0009] Ionic liquid type corrosion inhibitor 2 - 6%, polyether modified epoxy resin 25 - 35%, graphene nano-barrier agent 3 - 7%, self-healing microcapsules 6 - 10%, dispersing aid 1 - 3%, heat-resistant oxidation component 1 - 5%, toughening agent 2 - 4%, oily base component 5 - 15%, and the balance is organic solvent.

[0010] Preferably, the preparation method of the ionic liquid type corrosion inhibitor is: adding imidazole ionic liquid [EMIM][BF4] and ethanol into a reaction vessel according to a mass ratio of 8 - 10:1, ultrasonically dispersing for 18 - 30 minutes to obtain a uniformly dispersed ionic liquid type corrosion inhibitor.

[0011] Preferably, the preparation method of the polyether modified epoxy resin is: adding isopropanol, polyether-terminated epoxy resin and catalyst sodium hydroxide into a reaction vessel according to a mass ratio of 10 - 30:10:0.5 - 1, ultrasonically dispersing uniformly, reacting at 70 - 90 °C for 4 - 6 hours, cooling, centrifuging, washing, and drying to obtain polyether modified epoxy resin.

[0012] Preferably, the preparation method of the graphene nano-barrier agent is: adding polyamine-functionalized graphene and N-methylpyrrolidone (NMP) into a reaction vessel according to a mass ratio of 1:5, ultrasonically treating for 60 minutes and then stirring evenly, centrifuging to remove impurities and drying to obtain a functionalized graphene nano-barrier agent.

[0013] Preferably, the preparation method of the self-healing microcapsules is: encapsulating dicyclopentadiene in a polyurea shell layer, preparing by in-situ polymerization method, controlling the microcapsule particle size to be 1 - 3 μm, and the shell-core mass ratio to be 1:1.5 - 2.

[0014] Preferably, the preparation method of the heat-resistant oxidation component is: adding fluorosilane, dimethyl silicone oil and isopropanol into a reactor according to a mass ratio of 4 - 6:10:2 - 3, reacting at 140 - 160 °C for 100 - 140 minutes, cooling to room temperature, centrifuging, washing, and drying to obtain a heat-resistant oxidation functional component.

[0015] Preferably, the preparation method of the dispersing aid is: mixing polyvinyl alcohol and isopropanol according to a mass ratio of 4 - 6:1, ultrasonically dispersing evenly for 18 - 30 minutes to obtain a dispersing aid.

[0016] Preferably, the oily base component is polydimethylsiloxane or its low-viscosity derivative, and the solvent is a mixed organic solvent including ethyl acetate and methyl ethyl ketone, and their ratio is 4:1 - 5:1.

[0017] A formulation of an anti-corrosive paint for chemical industry, comprising the following steps:

[0018] Add each component into the reaction vessel according to the proportion, ultrasonically disperse for 30 - 60 minutes, then use high - shear mixing technology to mix for 40 - 60 minutes, with a mixing speed of 3000 - 5000 rpm, and control the system temperature at 25 - 35 °C to obtain a stably dispersed anti - corrosion paint.

[0019] Compared with the prior art, the advantages of the present invention are as follows:

[0020] (1) The present invention adopts the synergistic effect of multifunctional anti - corrosion components. By introducing an ionic liquid - type corrosion inhibitor and nano - filler composite material, it effectively blocks the erosion of corrosive media on the metal substrate, improves the corrosion resistance and service life of the coating, and is significantly superior to traditional anti - corrosion paints.

[0021] (2) The heat - resistant oxidation functional material and polymer resin system selected in the present invention enable the paint to remain structurally stable in high - temperature and strong acid - base environments, prevent the coating from cracking and peeling, and are suitable for long - term protection requirements in complex industrial environments.

[0022] (3) In the paint formula of the present invention, the ratio of resin to filler is reasonably designed to improve the mechanical strength and toughness of the coating, significantly enhance the adhesion of the coating to the substrate, reduce the peeling caused by mechanical stress, and ensure the integrity of the anti - corrosion layer.

[0023] (4) The present invention adopts a water - based solvent and an optimized dispersion technology, enabling the paint to have good rheological properties and coating flatness, being easy to construct and having a fast drying speed, improving production efficiency and reducing construction costs.

[0024] (5) The present invention adopts a water - based matrix and non - toxic and environmentally friendly additives, with low volatile organic compound (VOC) emissions, meeting national and international environmental protection standards, reducing the harm to the environment and human health, and conforming to the concept of green manufacturing.

[0025] (6) By introducing intelligent materials such as microcapsules in the present invention, the coating can automatically release active ingredients for repair when micro - cracks appear, extend the service life of the coating, and reduce maintenance costs.

[0026] (7) The present invention adopts advanced preparation processes such as ultrasonic dispersion and high - shear mixing, effectively reducing the paint particle size, improving the dispersion uniformity and stability, ensuring consistent performance between batches of the formula, and being suitable for large - scale industrial production.

[0027] (8) The present invention combines triple protection mechanisms of physical shielding, electrochemical corrosion inhibition and nano - enhancement, comprehensively improving the corrosion resistance and durability of the coating, and meeting the requirements of various industrial application scenarios. Specific embodiments

[0028] Example 1:

[0029] (1) Preparation method of ionic liquid type corrosion inhibitor: Add 80 g of ethanol solvent and 10 g of [EMIM][BF4] into a reaction vessel, and ultrasonically disperse for 18 minutes to obtain the ionic liquid type corrosion inhibitor.

[0030] (2) Preparation method of polyether modified epoxy resin: Add 80 g of polyether polyol (molecular weight about 1000), 20 g of epichlorohydrin, and 0.5 g of catalyst triethylamine into a reaction vessel, react at 60 °C for 6 h, remove by-products under reduced pressure after the reaction, and obtain polyether terminated epoxy resin. Add 20 g of isopropanol solvent, 0.6 g of sodium hydroxide, and 20 g of polyether terminated epoxy resin into the reaction vessel, ultrasonically disperse, and then react at 80 °C for 5 hours. Cool, centrifuge, wash with isopropanol and dry to obtain polyether modified epoxy resin.

[0031] (3) Preparation method of graphene nano-barrier agent: The functionalized graphene is selected as amino-functionalized graphene. Mix 5 g of functionalized graphene with 25 g of NMP, ultrasonically treat for 60 minutes, centrifuge and separate, and dry to obtain the graphene nano-barrier agent.

[0032] (4) Preparation method of self-healing microcapsules: Using dicyclopentadiene as the core material and polyurea as the shell material, control the shell-core mass ratio to be 1:1.5, emulsify and disperse, and then carry out in-situ polymerization. The obtained particle size is about 2 μm. Centrifuge, wash, and dry to obtain self-healing microcapsules.

[0033] (5) Preparation method of heat-resistant oxidation component: Mix 10 g of polysilsesquioxane, 2 g of phosphate antioxidant (TPP), and 88 g of xylene, stir at 70 °C for 30 min, filter and reserve to obtain a composite heat-resistant oxidation component.

[0034] (6) Preparation method of toughening agent: Mix 20 g of carboxyl nitrile butadiene rubber solution (10% concentration), 10 g of allyl polyether block copolymer with 70 g of isopropanol, and ultrasonically disperse at 50 °C for 30 min to obtain the toughening agent.

[0035] (7) Preparation method of anti-corrosion paint: Weigh according to weight percentage: 3% of ionic liquid type corrosion inhibitor, 30% of polyether modified epoxy resin, 5% of graphene nano-barrier agent, 8% of self-healing microcapsules, 2% of co-dispersant, 3% of heat-resistant oxidation component, 3% of toughening agent, 10% of polydimethylsiloxane, and the rest is a mixed solvent of ethyl acetate / butanone (mass ratio 4:1). Mix and ultrasonically treat for 30 minutes, and then carry out high-shear treatment for 50 minutes at a rotation speed of 4000 rpm to prepare the anti-corrosion paint.

[0036] Example 2:

[0037] (1)Preparation method of ionic liquid type corrosion inhibitor: Add 85 g of ethanol solvent and 11 g of [EMIM][BF4] into a reaction vessel, and ultrasonically disperse for 20 minutes to obtain an ionic liquid type corrosion inhibitor.

[0038] (2)Preparation method of polyether modified epoxy resin: Add 80 g of polyether polyol (molecular weight about 1000), 20 g of epichlorohydrin, and 0.5 g of catalyst triethylamine into a reaction vessel, react at 60 °C for 6 h, remove by-products under reduced pressure after the reaction, and obtain polyether terminated epoxy resin. Add 25 g of isopropanol solvent, 0.5 g of sodium hydroxide, and 20 g of polyether terminated epoxy resin into the reaction vessel, ultrasonically disperse, react at 80 °C for 5 h, cool to room temperature, centrifuge and separate, wash with isopropanol until clean and dry to obtain polyether modified epoxy resin.

[0039] (3)Preparation method of graphene nano-barrier agent: The functionalized graphene is selected as amino-functionalized graphene. Mix 5 g of functionalized graphene with 30 g of NMP, ultrasonically treat for 60 minutes, centrifuge, wash, and dry to obtain a graphene nano-barrier agent.

[0040] (4)Preparation method of self-healing microcapsules: Using dicyclopentadiene as the core material and polyurea as the shell material, control the mass ratio of shell to core to be 1:1.5, carry out in-situ polymerization reaction under emulsification conditions, reaction temperature 40 °C, time 4 hours, the obtained microcapsules have a particle size of 2 μm, centrifuge, wash, and dry to obtain self-healing microcapsules.

[0041] (5)Preparation method of heat-resistant oxidation component: Mix 10 g of polysilsesquioxane, 2 g of phosphate antioxidant (TPP), and 88 g of xylene, stir at 70 °C for 30 min, filter and reserve to obtain a composite heat-resistant oxidation component.

[0042] (6)Preparation method of toughening agent: Mix 20 g of carboxyl nitrile butadiene rubber solution (10% concentration), 10 g of allyl polyether block copolymer with 70 g of isopropanol, ultrasonically disperse at 50 °C for 30 min to obtain a toughening agent.

[0043] (7)Preparation method of anti-corrosion paint: Weigh the following materials according to the formula, by weight percentage, 4% of ionic liquid type corrosion inhibitor, 28% of polyether modified epoxy resin, 4% of graphene nano-barrier agent, 6% of self-healing microcapsules, 1.5% of co-dispersant, 2% of heat-resistant oxidation component, 3% of toughening agent, 12% of polydimethylsiloxane, and the rest is a mixed solvent of ethyl acetate / butanone (mass ratio 5:1). Add all raw materials into a reaction vessel, ultrasonically disperse for 30 minutes, use high-shear mixing technology to process for 50 minutes, the mixing speed is 4000 rpm, adjust the particle size and viscosity to obtain an anti-corrosion paint for chemical industry.

[0044] Example 3:

[0045] (1) Preparation method of ionic liquid type corrosion inhibitor: Add 75 g of ethanol solvent and 9 g of [EMIM][BF4] into a reaction vessel, and ultrasonically disperse for 15 minutes to obtain the ionic liquid type corrosion inhibitor.

[0046] (2) Preparation method of polyether modified epoxy resin: Add 80 g of polyether polyol (molecular weight about 1000), 20 g of epichlorohydrin, and 0.5 g of catalyst triethylamine into a reaction vessel, react at 60 °C for 6 h, remove by-products under reduced pressure after the reaction, and obtain polyether terminated epoxy resin. Add 18 g of isopropanol solvent, 0.6 g of sodium hydroxide, and 20 g of polyether terminated epoxy resin into the reaction vessel, ultrasonically disperse, react at 80 °C for 6 h, cool to room temperature, centrifuge, wash with isopropanol until clean and dry to obtain polyether modified epoxy resin.

[0047] (3) Preparation method of graphene nano-barrier agent: The functionalized graphene is aminated graphene. Mix 6 g of graphene with 30 g of NMP, ultrasonically treat for 60 minutes, centrifuge and dry to obtain the graphene nano-barrier agent.

[0048] (4) Preparation method of self-healing microcapsules: Using dicyclopentadiene as the core material and polyurea as the shell material, control the mass ratio of shell to core to be 1:2, emulsify and carry out in-situ polymerization under the condition of pH value 9 - 10, with a stirring speed of 1500 rpm, react for 3.5 hours, cool, centrifuge, wash and dry to obtain microcapsules.

[0049] (5) Preparation method of heat-resistant oxidation component: Mix 10 g of polysilsesquioxane, 2 g of phosphate antioxidant (TPP), and 88 g of xylene, stir at 70 °C for 30 min, filter and reserve to obtain a composite heat-resistant oxidation component.

[0050] (6) Preparation method of toughening agent: Mix 20 g of carboxyl nitrile rubber solution (10% concentration), 10 g of allyl polyether block copolymer with 70 g of isopropanol, ultrasonically disperse at 50 °C for 30 min to obtain the toughening agent.

[0051] (7) Preparation method of anti-corrosion paint: Weigh the following materials according to the formula, by weight percentage, 2.5% of ionic liquid type corrosion inhibitor, 32% of polyether modified epoxy resin, 6% of graphene nano-barrier agent, 9% of self-healing microcapsules, 2% of co-dispersant, 1% of heat-resistant oxidation component, 4% of toughening agent, 10% of polyether-siloxane mixed base component, and the rest is NMP solvent. Add all the raw materials into a reaction vessel, ultrasonically disperse for 30 minutes, and carry out high-shear mixing for 60 minutes at a mixing speed of 4500 rpm to obtain a high-stability anti-corrosion paint.

[0052] Example 4:

[0053] (1)Preparation method of ionic liquid type corrosion inhibitor: Add 80 g of ethanol solvent and 10 g of [EMIM][BF4] into a reaction vessel, and ultrasonically disperse for 18 minutes to obtain the ionic liquid type corrosion inhibitor.

[0054] (2)Preparation method of polyether modified epoxy resin: Add 80 g of polyether polyol (molecular weight about 1000), 20 g of epichlorohydrin, and 0.5 g of catalyst triethylamine into a reaction vessel, react at 60 °C for 6 h, and remove by-products under reduced pressure after the reaction to obtain polyether-terminated epoxy resin. Add 22 g of isopropanol solvent, 0.5 g of sodium hydroxide, and 20 g of polyether-terminated epoxy resin (modified by EO / PO copolymer) into the reaction vessel, ultrasonically disperse evenly, react at 85 °C for 5 hours, cool to room temperature, centrifuge, separate, and dry to obtain polyether modified epoxy resin.

[0055] (3)Preparation method of graphene nano-barrier agent: Mix 5 g of graphene with 20 g of ethanol, ultrasonically disperse for 60 minutes, centrifuge, separate, and dry to obtain the graphene nano-barrier agent.

[0056] (4)Preparation method of self-healing microcapsules: Use dicyclopentadiene as the core material and polyurea as the shell, control the mass ratio of shell to core to be 1:1.5, in-situ polymerize under emulsification conditions, reaction temperature 45 °C, time 4 h, the obtained particle size is 2 μm, centrifuge, wash, and dry to obtain self-healing microcapsules.

[0057] (5)Preparation method of heat-resistant oxidation component: Mix 10 g of polysilsesquioxane, 2 g of phosphate antioxidant (TPP), and 88 g of xylene, stir at 70 °C for 30 min, filter and reserve to obtain a composite heat-resistant oxidation component.

[0058] (6)Preparation method of toughening agent: Mix 20 g of carboxyl nitrile rubber solution (10% concentration), 10 g of allyl polyether block copolymer with 70 g of isopropanol, ultrasonically disperse at 50 °C for 30 min to obtain the toughening agent.

[0059] (7)Preparation method of anti-corrosion paint: Weigh each component in the formula, by weight percentage: 5% ionic liquid type corrosion inhibitor, 30% polyether modified epoxy resin, 5% graphene nano-barrier agent, 10% self-healing microcapsules, 3% co-dispersant, 2% heat-resistant oxidation component, 4% toughening agent, 8% polydimethylsiloxane, and the rest is a mixed solvent of butanone / toluene (mass ratio 3:2). Add all raw materials into a reaction vessel, ultrasonically disperse for 40 minutes, and high-shear mix for 50 minutes at a mixing speed of 4000 rpm to obtain an anti-corrosion paint with excellent performance.

[0060] Example 5:

[0061] (1)Preparation method of ionic liquid type corrosion inhibitor: Add 90 g of ethanol solvent and 12 g of imidazole ionic liquid [EMIM][BF4] into a reaction vessel, and ultrasonically treat for 20 minutes to disperse evenly to obtain the ionic liquid type corrosion inhibitor.

[0062] (2)Preparation method of polyether modified epoxy resin: Add 80 g of polyether polyol (molecular weight about 1000), 20 g of epichlorohydrin, and 0.5 g of catalyst triethylamine into a reaction vessel, react at 60 °C for 6 h, and remove by-products under reduced pressure after the reaction to obtain polyether terminated epoxy resin. Add 30 g of isopropanol solvent, 0.6 g of sodium hydroxide, and 25 g of polyether terminated epoxy resin into the reaction vessel, ultrasonically disperse, and then react at 75 °C for 6 hours. Cool to room temperature, centrifuge, wash with isopropanol until clean and dry to obtain polyether modified epoxy resin.

[0063] (3)Preparation method of graphene nano-barrier agent: Mix 7 g of graphene oxide and 35 g of NMP. The graphene oxide is carboxylated graphene oxide. Ultrasonically treat for 60 minutes, cool, and then centrifuge, wash, and dry to obtain the graphene nano-barrier agent.

[0064] (4)Preparation method of self-healing microcapsules: Using bisphenol A epoxy resin as the core material and polyurea as the shell material, prepare by emulsion polymerization method. The mass ratio of shell to core is 1:2, control the stirring speed at 1200 rpm, reaction temperature at 45 °C, and time at 4.5 hours. Centrifuge, wash, and dry to obtain self-healing microcapsules with a particle size of 3 μm.

[0065] (5)Preparation method of heat-resistant oxidation component: Mix 10 g of polysilsesquioxane, 2 g of phosphate antioxidant (TPP), and 88 g of xylene, stir at 70 °C for 30 min, filter and reserve to obtain a composite heat-resistant oxidation component.

[0066] (6)Preparation method of toughening agent: Mix 20 g of carboxyl nitrile butadiene rubber solution (10% concentration), 10 g of allyl polyether block copolymer, and 70 g of isopropanol, ultrasonically disperse at 50 °C for 30 min to obtain the toughening agent.

[0067] (7)Preparation method of anti-corrosion paint: Weigh the following materials according to the formula, with the weight in percentage: 3% of ionic liquid type corrosion inhibitor, 35% of polyether modified epoxy resin, 5% of graphene nano-barrier agent, 8% of self-healing microcapsules, 2% of co-dispersant, 3% of heat-resistant oxidation component, 2% of toughening agent, 10% of base component polydimethylsiloxane, and the rest is butyl acetate solvent. Add all raw materials into a reaction vessel, ultrasonically disperse for 30 minutes, and use high-shear mixing technology to process for 60 minutes, with a mixing speed of 4500 rpm, adjust the particle size and rheological properties of the paint system to obtain the anti-corrosion paint for chemical industry.

[0068] Comparative Example 1: According to the following formula, by weight percentage: 3% of ionic liquid type corrosion inhibitor (same as in Example 1), 35% of polyether modified epoxy resin (same as in Example 1), 8% of self-healing microcapsules (same as in Example 1), 2% of dispersing aid, 3% of heat-resistant oxidation component (same as in Example 1), 2% of toughening agent (same as in Example 1), 10% of polydimethylsiloxane, and the rest is butyl acetate solvent.

[0069] Comparative Example 2: According to the following formula, by weight percentage: 3% of ionic liquid type corrosion inhibitor (same as in Example 1), 35% of polyether modified epoxy resin (same as in Example 1), 5% of graphene nano-barrier agent (same as in Example 1), 2% of dispersing aid, 3% of heat-resistant oxidation component (same as in Example 1), 2% of toughening agent (same as in Example 1), 10% of polydimethylsiloxane, and the rest is butyl acetate solvent.

[0070] Performance Test

[0071] Experiment 1

[0072] 1. Adhesion Test (Cross-Cut Method)

[0073] Standard: GB / T9286-2021

[0074] Operation Method:

[0075] Spray the sample coatings of each group on the surface of the polished and rust-removed steel plate. After curing, use a cross-cut tool to cut and quickly tear off the tape, and evaluate the adhesion grade (0 - 5 levels, 0 is the best).

[0076] 2. Impact Strength Test (Direct Impact Test)

[0077] Standard: GB / T1732-2020

[0078] Operation Method:

[0079] Use an impact tester to hammer the coating from the front, and record the maximum non-cracking energy (kg·cm).

[0080] 3. Salt Spray Corrosion Test

[0081] Standard: GB / T1771-2007

[0082] Operation Method:

[0083] Place the sprayed sample plate in a neutral salt spray chamber. The test cycle is 1000h. After the cycle ends, evaluate the corrosion area ratio and the coating blistering and cracking conditions.

[0084] 4. Scratch Resistance Test: Drag a steel needle with a load of 1kg on the surface 5 times, and observe the scratch depth and the surface layer peeling area. The experimental results are shown in Table 1:

[0085] Table 1

[0086] Sample Number Adhesion (Grade) Impact Strength (kg·cm) Salt Spray Corrosion Area (%) Peeling Area after Scratching (mm²) Example 1 0 50 <1 0 Example 2 0 48 <1 0 Example 3 0 52 <1 0 Example 4 0 47 <1 0 Example 5 0 53 <1 0 Comparative Example 1 2 32 5~8 25 Comparative Example 2 1 38 3~5 18

[0087] It can be seen from the experimental data that for the paint coatings of Examples 1-5, due to the reasonable ratio of fillers (graphene, microcapsules) to resin, dense structure, good flexibility, the adhesion remains at the best grade 0, there is no peeling under impact, and there is almost no corrosion in salt spray test. In Comparative Example 1, the graphene barrier structure is missing, resulting in the rapid spread of corrosion points, the adhesion drops to grade 2, and the coating is prone to blistering and peeling. Although Comparative Example 2 has a barrier agent, due to the absence of microcapsules, the repair ability after scratching is poor, and the coating cracking and peeling are significant.

[0088] Experiment 2

[0089] 1. Rheology test (construction fluidity)

[0090] Standard basis: GB / T6753.4-1986

[0091] Method: Use Ford No. 4 cup to measure the outflow time (unit: s) of the paint at 25°C, which reflects its viscosity and fluidity. The outflow time of 15-30 s is suitable for construction.

[0092] 2. Drying time test (tack-free + through-drying)

[0093] Standard basis: GB / T1728-2020

[0094] Method: Under the conditions of constant temperature of 25°C and humidity of 50%, measure the tack-free (non-sticky to the touch) and through-drying (fully hardened) times (unit: minutes).

[0095] 3. Coating surface flatness test (specular gloss method + visual observation)

[0096] Standard basis: GB / T9754-2007

[0097] Method: Use a 60° gloss meter to measure the gloss value (GU), and at the same time, manually score (1-10 points) to evaluate the apparent defects such as pinholes, orange peel, and shrinkage holes. The experimental results are shown in Table 2:

[0098] Table 2

[0099] Sample Number Flow Time (s) Surface Dry Time (min) Through Dry Time (min) 60° Gloss Value (GU) Visual Rating (1 - 10) Example 1 24 15 45 92 9 Example 2 22 16 48 90 9 Example 3 25 15 46 93 10 Example 4 23 14 44 91 9 Example 5 26 15 47 94 10 Comparative Example 1 38 30 90 82 6 Comparative Example 2 31 22 65 85 7

[0100] Examples 1-5 adopt an aqueous dispersion system, combined with ultrasonic and high-shear treatment, to make the paint have ideal construction fluidity (Ford Cup 24-26 s), no sagging during construction, and uniform spraying; the drying time is greatly shortened (tack-free drying is about 15 min, through drying is about 45 min), which is about 30%-50% less time than that of the comparative example, improving the construction efficiency; the coating is flat, dense, and has a high mirror gloss (GU>90), with extremely few pinholes and orange peel, and the appearance score is as high as 9-10 points; in Comparative Example 1, a solvent-based system is used, and the coating is sticky and slow-drying with poor fluidity; although Comparative Example 2 is an aqueous system, particle agglomeration caused by insufficient dispersion technology affects the flatness.

[0101] The above shows and describes the basic principles, main features and advantages of the present invention; those skilled in the art should understand that the present invention is not limited by the above embodiments, and the above embodiments and descriptions in the specification are only preferred examples of the present invention, and are not used to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed; the scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. An anti-corrosion paint for chemical industry, characterized in that: The paint comprises the following components by weight percentage: 2 - 6% of ionic liquid - type corrosion inhibitor, 25 - 35% of polyether - modified epoxy resin, 3 - 7% of graphene nano - barrier agent, 6 - 10% of self - healing microcapsules, 1 - 3% of co - dispersant, 1 - 5% of heat - resistant and oxidation - resistant component, 2 - 4% of toughening agent, 5 - 15% of oily base component, and the balance is organic solvent; The preparation method of the ionic liquid - type corrosion inhibitor is as follows: Imidazole - based ionic liquid [EMIM][BF4] and ethanol are added into a reaction vessel according to a mass ratio of 8 - 10:1, and ultrasonic dispersion is carried out for 18 - 30 minutes to obtain a uniformly dispersed ionic liquid - type corrosion inhibitor.

2. The anti-corrosion paint for chemical industry according to claim 1, characterized in that: The preparation method of the polyether - modified epoxy resin is as follows: Isopropanol, polyether - terminated epoxy resin and catalyst sodium hydroxide are added into a reaction vessel according to a mass ratio of 10 - 30:10:0.5 - 1. After ultrasonic dispersion to be uniform, the reaction is carried out at 70 - 90 °C for 4 - 6 hours, and then cooled, centrifuged, washed and dried to obtain polyether - modified epoxy resin.

3. A corrosion-resistant paint for chemical industry according to claim 1, characterized in that: The preparation method of the graphene nano - barrier agent is as follows: Polyamine - functionalized graphene and N - methylpyrrolidone (NMP) are added into a reaction vessel according to a mass ratio of 1:

5. After ultrasonic treatment for 60 minutes and then stirring evenly, centrifugation is carried out to remove impurities and drying is carried out to obtain a functionalized graphene nano - barrier agent.

4. A corrosion-resistant paint for chemical industry according to claim 1, characterized in that: The preparation method of the self - healing microcapsules is as follows: Dicyclopentadiene is encapsulated in a polyurea shell layer and prepared by in - situ polymerization method, controlling the particle size of the microcapsules to be 1 - 3 μm and the mass ratio of the shell to the core to be 1:1.5 - 2.

5. A corrosion-resistant paint for chemical industry according to claim 1, characterized in that: The preparation method of the heat - resistant and oxidation - resistant component is as follows: Fluorosilane, dimethyl silicone oil and isopropanol are added into a reactor according to a mass ratio of 4 - 6:10:2 - 3, and the reaction is carried out at 140 - 160 °C for 100 - 140 minutes. After cooling to room temperature, centrifugation, washing and drying are carried out to obtain a heat - resistant and oxidation - resistant functional component.

6. A corrosion-resistant paint for chemical industry according to claim 1, characterized in that: The preparation method of the co - dispersant is as follows: Polyvinyl alcohol and isopropanol are mixed according to a mass ratio of 4 - 6:1, and ultrasonic dispersion is carried out for 18 - 30 minutes to be uniform to obtain a co - dispersant.

7. A corrosion-resistant paint for chemical industry according to claim 1, characterized in that: The oily base component is polydimethylsiloxane or its low - viscosity derivative, and the solvent is a mixed organic solvent, including ethyl acetate and methyl ethyl ketone, and their ratio is 4:1 - 5:

1.

8. A formulation of an anti-corrosion paint for chemical industry, relating to an anti-corrosion paint for chemical industry according to any one of claims 1-7, characterized in that, It includes the following steps: Add each component into a reaction vessel according to the proportion, carry out ultrasonic dispersion for 30 - 60 minutes, and then use high - shear mixing technology to mix for 40 - 60 minutes, with the mixing speed of 3000 - 5000 rpm, controlling the system temperature at 25 - 35 °C to obtain a stably dispersed anti - corrosion paint.