Environment-friendly high-temperature-resistant wear-resistant epoxy resin anticorrosive paint and preparation method thereof

Abstract

The invention relates to the technical field of environment-friendly epoxy resin coatings, in particular to an environment-friendly high-temperature-resistant and wear-resistant epoxy resin anticorrosive coating and a preparation method of the environment-friendly high-temperature-resistant and wear-resistant epoxy resin anticorrosive coating. The component A is prepared from the following raw materials in parts by weight: 30 to 50 parts of waterborne epoxy resin emulsion, 0.4 to 0.8 part of dispersing agent, 0.3 to 0.5 part of flatting agent, 0.3 to 0.5 part of defoaming agent, 0.4 to 0.8 part of wetting agent, 0.4 to 0.6 part of thickening agent, 5 to 10 parts of anti-rust pigment, 0.3 to 0.5 part of anti-flash-rust agent, 3 to 5 parts of precipitated barium sulphate, 8 to 10 parts of modified filler and 10 to 30 parts of deionized water; the component B comprises the following raw materials in parts by weight: 3-5 parts of an epoxy curing agent and 4-6 parts of deionized water; the molar ratio of epoxy groups in the water-borne epoxy resin emulsion to amino groups in the epoxy curing agent is 1: (1.1-1.3). The epoxy resin coating prepared by the invention has excellent high temperature resistance, wear resistance and corrosion resistance.

Description

Technical Field

[0001] This invention relates to the field of environmentally friendly epoxy resin coating technology, specifically to an environmentally friendly high-temperature resistant and wear-resistant epoxy resin anti-corrosion coating and its preparation method. Background Technology

[0002] Epoxy resin coatings are widely used for equipment protection in aerospace, petrochemical, and heavy machinery industries due to their excellent adhesion, chemical resistance, and mechanical properties. However, traditional epoxy resin coatings suffer from core technological bottlenecks, making it difficult to simultaneously achieve environmental friendliness, high-temperature resistance, and abrasion resistance. This makes them unsuitable for the demanding, complex working conditions of equipment in these fields, which are subjected to prolonged high temperatures and high-speed friction. Current technologies typically employ a bisphenol A-type epoxy resin and aliphatic amine curing system. Under high temperatures, the coating's molecular chains are prone to degradation and the cross-linking network is disrupted, leading to cracking, chalking, and loss of protective function. Furthermore, their abrasion resistance is insufficient, making them susceptible to wear and scratches under heavy-load friction. In addition, traditional solvent-based epoxy coatings exceed VOC emission standards, failing to meet current environmental regulations. While water-based and solvent-free epoxy coatings can reduce VOC emissions, they suffer from a significant decrease in heat resistance and abrasion resistance.

[0003] In the prior art, patent CN119978961B discloses a corrosion-resistant epoxy resin coating, which consists of two parts: component 1 and component 2. Component 1 includes the following raw materials: bisphenol A type epoxy resin, corrosion-resistant illite, defoamer, antioxidant, ultraviolet absorber, and deionized water; component 2 includes the following raw materials: heat-resistant crosslinking curing agent and leveling agent. This invention incorporates corrosion-resistant illite and heat-resistant crosslinking curing agent into the preparation process of the epoxy resin coating, resulting in an epoxy resin coating with excellent mechanical strength, wear resistance, and heat resistance. However, this epoxy resin uses deionized water as a solvent but does not use dispersants or other additives, which may make the coating prone to bubbles / pinholes, affecting the coating's corrosion resistance.

[0004] Patent CN1200595999A discloses a highly environmentally friendly and flexible modified epoxy resin waterproof coating and its preparation method. The modified epoxy resin waterproof coating comprises the following components in parts by weight: 40-50 parts modified epoxy resin; 10-15 parts polyurethane; 8-12 parts isocyanate; 15-20 parts asymmetric amino curing agent; 2-5 parts nano-graphene; 3-6 parts polyester toughening agent; 1-2 parts organometallic catalyst; 0.5-1 part defoamer; and 2-3 parts accelerator. This invention combines organometallic catalyst and polyurethane to accelerate the curing speed of the coating. This improvement significantly shortens the curing time after application, addressing the problem of excessively long curing times in existing technologies. It not only improves construction efficiency but also reduces performance instability caused by incomplete curing, ensuring high-quality and efficient coating completion. However, while the flexible segments of polyurethane and polyester toughening agent in the formulation provide flexibility, they significantly lower the glass transition temperature of the entire system, affecting the high-temperature resistance of the coating.

[0005] Therefore, there is an urgent need in the market for an environmentally friendly epoxy resin coating with excellent high-temperature resistance and corrosion resistance. Summary of the Invention

[0006] In view of the problems existing in the prior art, the purpose of this invention is to obtain an environmentally friendly epoxy resin coating with excellent high temperature resistance, wear resistance and abrasion resistance.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows: The first aspect of this invention provides an environmentally friendly, high-temperature resistant, and wear-resistant epoxy resin anti-corrosion coating, comprising component A and component B. Component A comprises the following raw materials in parts by weight: 30-50 parts of waterborne epoxy resin emulsion, 0.4-0.8 parts of dispersant, 0.3-0.5 parts of leveling agent, 0.3-0.5 parts of defoamer, 0.4-0.8 parts of wetting agent, 0.4-0.6 parts of thickener, 5-10 parts of anti-rust pigment, 0.3-0.5 parts of anti-flash rust agent, 3-5 parts of precipitated barium sulfate, 8-10 parts of modified filler, and 10-30 parts of deionized water. Component B comprises the following raw materials in parts by weight: 3-5 parts of epoxy curing agent and 4-6 parts of deionized water. The molar ratio of epoxy groups in the waterborne epoxy resin emulsion to amino groups in the epoxy curing agent is 1:(1.1-1.3).

[0008] In some embodiments, the dispersant is one or more of BKY-110, BKY-194, and BKY-346.

[0009] In some embodiments, the leveling agent is a polyether siloxane copolymer.

[0010] In some embodiments, the defoamer is an organosilicone defoamer.

[0011] In some embodiments, the wetting agent is one or more of PEG200, PEG400, and PEG800.

[0012] Preferably, the wetting agent is PEG200.

[0013] In some embodiments, the thickener is one of cellulose-based thickeners, polyurethane-based thickeners, and acrylic-based thickeners.

[0014] This application describes a process where waterborne epoxy resin emulsion, dispersant, leveling agent, defoamer, wetting agent, thickener, rust-inhibiting pigment, flash rust inhibitor, precipitated barium sulfate, and modified filler are added to deionized water to obtain component A. This component A is then compounded with component B to obtain an environmentally friendly, high-temperature resistant, and wear-resistant epoxy resin anti-corrosion coating. The addition of rust-inhibiting pigment, modified filler, and flash rust inhibitor constructs a multi-layered anti-corrosion system, providing chemical corrosion protection, physical shielding, and flash rust prevention, resulting in excellent corrosion resistance. This application also constructs a complete additive system encompassing dispersing, wetting, leveling, thickening, and defoaming functions, enabling the epoxy resin coating to be easily dispersed, easy to apply, easy to store, and has a good film appearance.

[0015] In some embodiments, the anti-rust pigment is one or more of ferrotitanium phosphate, zinc phosphate, and zinc tripolyphosphate.

[0016] Preferably, the anti-rust pigment is zinc tripolyphosphate.

[0017] In some embodiments, the organozinc chelate-type flash rust inhibitor is used.

[0018] In some embodiments, the method for preparing the modified filler includes the following steps: A1. Add silica powder and magnesium aluminum hydrotalcite to deionized water, sonicate for 30-60 min, adjust pH to 8-9, add 0.05-0.15 mol / L cerium nitrate solution dropwise, stir at room temperature for 20-40 min, add 0.05-0.15 mol / L diammonium hydrogen phosphate aqueous solution dropwise, heat to 55-65°C and continue the reaction for 3-5 h, cool to room temperature, centrifuge, wash, and vacuum dry to obtain composite filler; A2. Add the composite filler obtained in step A1 and KH-550 to an ethanol aqueous solution, heat to 65-75°C and react for 4-6 hours, centrifuge, wash and dry to obtain the modified filler.

[0019] Preferably, the ratio of the silicon micro powder to deionized water is 1g:(8-12)ml.

[0020] Preferably, the concentration of the ethanol aqueous solution is 85-95 wt%.

[0021] This application describes a composite material obtained by ultrasonically mixing silica powder and magnesium-aluminum hydrotalcite, then reacting it with cerium nitrate and diammonium hydrogen phosphate to form cerium phosphate. This composite material is then reacted with KH-550 to obtain a modified filler. Adding this modified filler to waterborne epoxy resin coatings can improve their corrosion resistance, heat resistance, and wear resistance. This is likely because: firstly, silica powder, being a high-hardness inorganic material, acts as a physical cross-linking point and skeletal support in epoxy resin coatings, enhancing the coating's wear and heat resistance; hydrotalcite, with its layered structure, synergistically forms a staggered structure with silica powder, creating a labyrinth effect that significantly extends the path of corrosive media such as water molecules, oxygen, and chloride ions to the substrate surface, further improving the coating's corrosion resistance; secondly, when the coating is damaged or water and oxygen penetrate to the substrate, the cerium ions on the modified filler can hydrolyze to form insoluble hydroxides or oxides, inhibiting electrochemical corrosion reactions and acting as a corrosion inhibitor. Phosphate ions can react with the iron substrate to form a dense iron phosphate passivation film, effectively isolating corrosive agents. Meanwhile, magnesium-aluminum hydrotalcite possesses anion exchange capabilities. When corrosive ions penetrate into the coating, the hydrotalcite can capture the ions and release pre-stored phosphate or corrosion-inhibiting ions, achieving self-repairing or intelligent response anti-corrosion effects. Furthermore, after cerium ion modification, the filler contains more active groups, allowing it to be loaded with a large number of KH-550 segments that can react with the epoxy resin backbone. This significantly improves the compatibility and dispersibility of the modified filler with the resin, resulting in a denser coating and significantly enhanced corrosion resistance. The introduction of highly stable inorganic fillers also increases the glass transition temperature and thermal decomposition temperature of the composite material, significantly improving heat resistance. Thus, while maintaining environmentally friendly characteristics, it comprehensively extends the service life of the coating in harsh corrosive environments.

[0022] In some embodiments, the mass ratio of the silica powder to the magnesium aluminum hydrotalcite is 1:(0.10-0.15).

[0023] In some embodiments, the ratio of the silicon micropowder to a 0.05-0.15 mol / L cerium nitrate solution is 1 g : (0.45-0.55) ml.

[0024] In some embodiments, the molar ratio of cerium nitrate to diammonium hydrogen phosphate is 1:(1-1.5).

[0025] In some embodiments, the mass ratio of the composite filler and KH-550 in step A2 is 1:(0.015-0.025).

[0026] A second aspect of this invention provides a method for preparing an environmentally friendly, high-temperature resistant, and wear-resistant epoxy resin anti-corrosion coating, comprising the following steps: S1. Add deionized water to the reaction vessel, and add dispersant, wetting agent and a portion of defoamer in sequence at a speed of 300-500 rpm. Stir for 20-30 min, add rust-preventive pigment, flash rust inhibitor, precipitated barium sulfate and modified filler, and stir at a speed of 1000-1500 rpm for 20-40 min. Continue to add waterborne epoxy resin emulsion, leveling agent and thickener and the remaining amount of defoamer, stir for 15-30 min, filter, and obtain component A. S2. Add the epoxy curing agent to deionized water and stir at 300-500 rpm for 20-30 minutes to obtain component B; S3. When using, mix component A obtained in step S1 and component B obtained in step S2 at room temperature and stir for 20-30 minutes to obtain an environmentally friendly high-temperature resistant and wear-resistant epoxy resin anti-corrosion coating.

[0027] Preferably, the waterborne epoxy resin emulsion is of the type Randberg MT-HY12; and the epoxy curing agent is of the type Randberg CA-8113.

[0028] Preferably, the mass ratio of component A to component B is 1:(0.09-0.11).

[0029] In some embodiments, the epoxy curing agent is a nonionic epoxy curing agent.

[0030] Compared with the prior art, the present invention has the following beneficial effects: (1) The present invention obtains component A by adding waterborne epoxy resin emulsion, dispersant, leveling agent, defoamer, wetting agent, thickener, anti-rust pigment, anti-flash rust agent, precipitated barium sulfate and modified filler to deionized water and mixing them together, and then compounding them with component B to obtain an environmentally friendly high temperature and wear resistant epoxy resin anti-corrosion coating.

[0031] (2) The present invention first ultrasonically mixes silicon micro powder and magnesium aluminum hydrotalcite, and then reacts it with cerium nitrate and diammonium hydrogen phosphate to generate cerium phosphate to obtain a composite material. Then it reacts with KH-550 to obtain a modified filler. Adding it to waterborne epoxy resin coating can improve its corrosion resistance, heat resistance and wear resistance.

[0032] (3) The modified filler prepared by the present invention contains a large number of KH-550 segments that can participate in the curing reaction of epoxy resin, which improves the compatibility and dispersibility of the modified filler and resin, making the coating denser and significantly improving the corrosion resistance of the coating. The introduction of highly stable inorganic filler also improves the glass transition temperature and thermal decomposition temperature of the composite material, significantly improving the heat resistance. Thus, while maintaining environmental protection characteristics, the service life of the coating in harsh corrosive environments is extended. Detailed Implementation

[0033] The present invention will be described below with reference to specific embodiments. It should be noted that the following embodiments are examples of the present invention and are used only to illustrate the invention, not to limit it. Other combinations and various modifications within the scope of the present invention can be made without departing from its spirit or scope.

[0034] In the following examples and comparative examples, except for the modified filler, all other compounds and related reagents used were commercially available. The waterborne epoxy resin emulsion was Randberg MT-HY12; the epoxy resin curing agent was Randberg CA-8113; the dispersant was BKY-110; the leveling agent was TEGO Glide 450; the defoamer was TEGO AIREX 902W, all purchased from Shanghai Zhenlishi Network Technology Co., Ltd.; the wetting agent was BKY-346; the thickener was 303A, purchased from Wuhan Runxingyuan Technology Co., Ltd.; the flash rust inhibitor was NALZIN FA 379, purchased from Guangzhou Huiwangcheng Chemical Co., Ltd.; the average particle size of the precipitated barium sulfate was 5000 mesh; the average particle size of the silica powder was 1250 mesh; and the magnesium aluminum hydrotalcite was D200Y15, purchased from Hefei Anyuhe New Material Technology Co., Ltd.

[0035] Preparation Example 1 The preparation method of modified filler-1 includes the following steps: A1. Add 10g of silica powder and 1.2g of magnesium aluminum hydrotalcite to 100ml of deionized water, sonicate for 45min, adjust the pH to 8 with 0.1mol / L ammonia solution, add 5ml of 0.1mol / L cerium nitrate solution, stir at room temperature for 30min, add 6ml of 0.1mol / L diammonium hydrogen phosphate solution, heat to 60°C and continue the reaction for 4h, cool to room temperature, centrifuge, wash 3 times with deionized water, and vacuum dry at 60°C to obtain the composite filler; A2. Add 10g of the composite filler obtained in step A1 and 0.2g of KH-550 to 100ml of 90wt% ethanol aqueous solution, heat to 70°C and react for 5h, centrifuge at 8000r / min for 10min, wash twice with anhydrous ethanol and once with deionized water, and dry at 60°C for 1h to obtain modified filler-1.

[0036] Preparation Example 2 The preparation method of modified filler-2 is the same as that of preparation example 1, except that the amount of magnesium aluminum hydrotalcite added is 3g.

[0037] Preparation Example 3 The preparation method of modified filler-3 is the same as that of preparation example 1, except that the amount of cerium nitrate solution added is 7 ml.

[0038] Preparation Example 4 The preparation method of modified filler-4 is the same as that of preparation example 1, except that the amount of KH-550 added is 0.05g.

[0039] Preparation Example 5 The preparation method of modified filler-5 includes the following steps: 10g of silica powder, 1.2g of magnesium aluminum hydrotalcite and 0.2g of KH-550 are added to 100ml of 90wt% ethanol aqueous solution, heated to 70°C and reacted for 5h, centrifuged at 8000r / min for 10min, washed twice with anhydrous ethanol and once with deionized water, and dried at 60°C for 1h to obtain modified filler-5.

[0040] Example 1 An environmentally friendly, high-temperature resistant, and wear-resistant epoxy resin anti-corrosion coating is composed of component A and component B. Component A includes the following raw materials by weight: 40 parts of water-based epoxy resin emulsion, 0.6 parts of dispersant, 0.4 parts of leveling agent, 0.4 parts of defoamer, 0.6 parts of wetting agent, 0.5 parts of thickener, 7 parts of zinc tripolyphosphate, 0.4 parts of flash rust inhibitor, 4 parts of precipitated barium sulfate, 9 parts of modified filler-1, and 20 parts of deionized water. Component B includes the following raw materials by weight: 4 parts of epoxy curing agent and 5 parts of deionized water.

[0041] The preparation method of the environmentally friendly, high-temperature resistant, and wear-resistant epoxy resin anti-corrosion coating in this embodiment includes the following steps: S1. Add deionized water to the reaction vessel. Add dispersant, wetting agent and half of the defoamer in sequence at 400 rpm and stir for 7 min. Add zinc tripolyphosphate, anti-flash rust agent, precipitated barium sulfate and modified filler-1 at 800 rpm. Increase the speed to 1000 rpm and stir for 15 min. Reduce the speed to 600 rpm and continue to add waterborne epoxy resin emulsion. After stirring for 10 min, add leveling agent, thickener and the remaining defoamer and stir for 12 min. Filter with a 120 mesh filter to obtain component A. S2. Add the epoxy curing agent to deionized water and stir at 400 rpm for 10 min to obtain component B; S3. When using, mix component A obtained in step S1 and component B obtained in step S2 at room temperature. The mass ratio of component A to component B is 1:0.1. Stir at 350 rpm for 25 minutes to obtain an environmentally friendly high-temperature resistant and wear-resistant epoxy resin anti-corrosion coating.

[0042] Example 2 An environmentally friendly, high-temperature resistant, and wear-resistant epoxy resin anti-corrosion coating is composed of component A and component B. Component A includes the following raw materials in parts by weight: 30 parts of water-based epoxy resin emulsion, 0.4 parts of dispersant, 0.3 parts of leveling agent, 0.3 parts of defoamer, 0.4 parts of wetting agent, 0.4 parts of thickener, 5 parts of zinc tripolyphosphate, 0.3 parts of flash rust inhibitor, 3 parts of precipitated barium sulfate, 8 parts of modified filler-1, and 10 parts of deionized water. Component B includes the following raw materials in parts by weight: 3 parts of epoxy curing agent and 4 parts of deionized water.

[0043] The preparation method of the environmentally friendly, high-temperature resistant, and wear-resistant epoxy resin anti-corrosion coating in this embodiment includes the following steps: S1. Add deionized water to the reaction vessel. Add dispersant, wetting agent and half of the defoamer in sequence at 300 rpm and stir for 10 min. Add zinc tripolyphosphate, anti-flash rust agent, precipitated barium sulfate and modified filler-1 at 700 rpm. Increase the speed to 900 rpm and stir for 20 min. Reduce the speed to 500 rpm and continue to add waterborne epoxy resin emulsion. After stirring for 15 min, add leveling agent, thickener and the remaining defoamer and stir for 15 min. Filter with a 120 mesh filter to obtain component A. S2. Add the epoxy curing agent to deionized water and stir at 300 rpm for 12 min to obtain component B; S3. When using, mix component A obtained in step S1 and component B obtained in step S2 at room temperature. The mass ratio of component A to component B is 1:0.1. Stir at 300 rpm for 30 minutes to obtain an environmentally friendly high-temperature resistant and wear-resistant epoxy resin anti-corrosion coating.

[0044] Example 3 An environmentally friendly, high-temperature resistant, and wear-resistant epoxy resin anti-corrosion coating is composed of component A and component B. Component A includes the following raw materials in parts by weight: 50 parts of water-based epoxy resin emulsion, 0.8 parts of dispersant, 0.5 parts of leveling agent, 0.5 parts of defoamer, 0.8 parts of wetting agent, 0.6 parts of thickener, 10 parts of zinc tripolyphosphate, 0.5 parts of flash rust inhibitor, 5 parts of precipitated barium sulfate, 10 parts of modified filler-1, and 30 parts of deionized water. Component B includes the following raw materials in parts by weight: 5 parts of epoxy curing agent and 6 parts of deionized water.

[0045] The preparation method of the environmentally friendly, high-temperature resistant, and wear-resistant epoxy resin anti-corrosion coating in this embodiment includes the following steps: S1. Add deionized water to the reaction vessel. Add dispersant, wetting agent and half of the defoamer in sequence at 500 rpm and stir for 5 min. Add zinc tripolyphosphate, anti-flash rust agent, precipitated barium sulfate and modified filler-1 at 900 rpm. Increase the speed to 1100 rpm and stir for 10 min. Reduce the speed to 700 rpm and continue to add waterborne epoxy resin emulsion. After stirring for 5 min, add leveling agent, thickener and the remaining defoamer. Stir for 10 min and filter with a 120 mesh filter to obtain component A. S2. Add the epoxy curing agent to deionized water and stir at 500 rpm for 8 minutes to obtain component B; S3. When using, mix component A obtained in step S1 and component B obtained in step S2 at room temperature. The mass ratio of component A to component B is 1:0.1. Stir at 400 rpm for 20 minutes to obtain an environmentally friendly high-temperature resistant and wear-resistant epoxy resin anti-corrosion coating.

[0046] Example 4 An environmentally friendly high-temperature and wear-resistant epoxy resin anti-corrosion coating and its preparation method are disclosed. The specific implementation method is the same as that in Example 1, except that the modified filler-1 is replaced with modified filler-2 in equal amounts.

[0047] Example 5 An environmentally friendly high-temperature and wear-resistant epoxy resin anti-corrosion coating and its preparation method are disclosed. The specific implementation method is the same as that in Example 1, except that the modified filler-1 is replaced with an equal amount of modified filler-3.

[0048] Example 6 An environmentally friendly high-temperature and wear-resistant epoxy resin anti-corrosion coating and its preparation method are disclosed. The specific implementation method is the same as that in Example 1, except that the modified filler-1 is replaced with an equal amount of modified filler-4.

[0049] Example 7 An environmentally friendly high-temperature and wear-resistant epoxy resin anti-corrosion coating and its preparation method are disclosed. The specific implementation method is the same as that in Example 1, except that the modified filler-1 is replaced with an equal amount of modified filler-5.

[0050] Comparative Example 1 An environmentally friendly high-temperature and wear-resistant epoxy resin anti-corrosion coating and its preparation method are disclosed. The specific implementation method is the same as that in Example 1, except that the modified filler-1 is replaced with an equal amount of silica powder.

[0051] Performance testing The environmentally friendly, high-temperature resistant, and wear-resistant epoxy resin anti-corrosion coatings obtained in the above embodiments were tested: (1) Sample preparation The epoxy resin anti-corrosion coatings prepared in each embodiment and comparative example were applied to tinplate and dried at 60°C for 60 min, with a film thickness of 50 μm, to obtain the samples to be tested.

[0052] (2) Test method 1. High temperature resistance: Refer to GB / T 1732 In 2020, the impact resistance of the coating was tested. Then, each sample was placed in an oven at 100°C for 24 hours. The impact resistance of the coating after high-temperature treatment was tested, and the high-temperature resistance of each sample was characterized by the change in impact resistance.

[0053] 2. Wear resistance: Weigh each sample initially as m1, then fix it on the Taber wear tester turntable and install a CS-17 grinding wheel. Load a 750g weight and set the rotation speed to 500 revolutions. Start the test at a temperature of 23±2℃ and a humidity of 50±5%RH. After the test, clean the dust off the surface of each sample and weigh each sample again as m2. Calculate the wear amount: wear amount = m1 - m2.

[0054] 3. Corrosion resistance: Salt spray resistance test was conducted on each sample according to the method of GB / T 1771-2007.

[0055] The test results are shown in Table 1: Table 1 As shown in Table 1, the epoxy resin anti-corrosion coatings in Examples 1-3 of this invention exhibit excellent wear resistance, heat resistance, and corrosion resistance. A comparison between Example 4 and Example 1 reveals that changing the ratio of silica powder to magnesium aluminum hydrotalcite may cause a large number of cerium ions to be adsorbed onto the surface of the hydrotalcite, leading to a reduction in cerium ions on the silica powder. This reduces the number of active sites on the silica powder, affecting the modification effect of KH-550, and consequently decreasing the dispersibility of the modified filler, resulting in poorer wear resistance, heat resistance, and corrosion resistance of the epoxy resin anti-corrosion coating. A comparison between Example 5 and Example 1 shows that changing the ratio of silica powder to cerium nitrate solution may cause a large amount of cerium phosphate precipitate to form in the system, resulting in an excessively thick coating on the hydrotalcite surface. The formation of cerium phosphate layers, and even agglomerates, leads to a deterioration in the wear resistance, heat resistance, and corrosion resistance of the epoxy resin anti-corrosion coating. A comparison between Example 6 and Example 1 shows that changing the ratio of composite filler and KH-550 may decrease the dispersibility of the modified filler in the coating system, resulting in a deterioration in the wear resistance, heat resistance, and corrosion resistance of the epoxy resin anti-corrosion coating. A comparison between Example 7 and Example 1 shows that when only KH-550 modified filler is used, the wear resistance, heat resistance, and corrosion resistance of the epoxy resin anti-corrosion coating are poor. A comparison between Comparative Example 1 and Example 1 shows that the conventional epoxy resin anti-corrosion coating obtained using silica powder as filler has poor wear resistance, heat resistance, and corrosion resistance.

[0056] The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it. They should not be used to limit the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. An environmentally friendly, high-temperature resistant, and wear-resistant epoxy resin anti-corrosion coating, composed of component A and component B, characterized in that, Component A comprises the following raw materials in parts by weight: 30-50 parts of waterborne epoxy resin emulsion, 0.4-0.8 parts of dispersant, 0.3-0.5 parts of leveling agent, 0.3-0.5 parts of defoamer, 0.4-0.8 parts of wetting agent, 0.4-0.6 parts of thickener, 5-10 parts of rust-preventive pigment, 0.3-0.5 parts of flash rust inhibitor, 3-5 parts of precipitated barium sulfate, 8-10 parts of modified filler, and 10-30 parts of deionized water; Component B comprises the following raw materials in parts by weight: 5-7 parts of epoxy curing agent and 4-6 parts of deionized water; The molar ratio of epoxy groups in the waterborne epoxy resin emulsion to amino groups in the epoxy curing agent is 1:(1.1-1.3).

2. The environmentally friendly, high-temperature resistant, and wear-resistant epoxy resin anticorrosive coating according to claim 1, characterized in that, The rust-preventive pigment is one or more of ferrotitanium powder, zinc phosphate, and zinc tripolyphosphate.

3. The environmentally friendly, high-temperature resistant, and wear-resistant epoxy resin anticorrosive coating according to claim 1, characterized in that, The flash rust inhibitor is an organozinc chelate type flash rust inhibitor.

4. The environmentally friendly, high-temperature resistant, and wear-resistant epoxy resin anti-corrosion coating according to claim 1, characterized in that, The method for preparing the modified filler includes the following steps: A1. Add silica powder and magnesium aluminum hydrotalcite to deionized water, sonicate for 30-60 min, adjust pH to 8-9, add 0.05-0.15 mol / L cerium nitrate solution dropwise, stir at room temperature for 20-40 min, add 0.05-0.15 mol / L diammonium hydrogen phosphate aqueous solution dropwise, heat to 55-65°C and continue the reaction for 3-5 h, cool to room temperature, centrifuge, wash, and vacuum dry to obtain composite filler; A2. Add the composite filler obtained in step A1 and KH-550 to an ethanol aqueous solution, heat to 65-75°C and react for 4-6 hours, centrifuge, wash and dry to obtain the modified filler.

5. The environmentally friendly high-temperature resistant and wear-resistant epoxy resin anti-corrosion coating according to claim 4, characterized in that, The mass ratio of the silica powder to the magnesium aluminum hydrotalcite is 1:(0.10-0.15).

6. The environmentally friendly high-temperature resistant and wear-resistant epoxy resin anti-corrosion coating according to claim 4, characterized in that, The ratio of the silicon micropowder to the 0.05-0.15 mol / L cerium nitrate solution is 1 g : (0.45-0.55) ml.

7. The environmentally friendly, high-temperature resistant, and wear-resistant epoxy resin anti-corrosion coating according to claim 4, characterized in that, The molar ratio of cerium nitrate and diammonium hydrogen phosphate is 1:(1-1.5).

8. The environmentally friendly, high-temperature resistant, and wear-resistant epoxy resin anti-corrosion coating according to claim 4, characterized in that, The mass ratio of the composite filler and KH-550 in step A2 is 1:(0.015-0.025).

9. A method for preparing an environmentally friendly, high-temperature resistant, and wear-resistant epoxy resin anticorrosive coating according to any one of claims 1-8, characterized in that, Includes the following steps: S1. Add deionized water to the reaction vessel. Add dispersant, wetting agent and a portion of defoamer sequentially at 300-500 rpm. Stir for 5-10 minutes. Add rust-inhibiting pigment, flash rust inhibitor, precipitated barium sulfate and modified filler at 700-900 rpm. Increase the speed to 900-1100 rpm and stir for 10-20 minutes. Reduce the speed to 500-700 rpm and continue to add waterborne epoxy resin emulsion. Stir for 5-15 minutes. Add leveling agent, thickener and the remaining defoamer. Stir for 10-15 minutes. Filter to obtain component A. S2. Add the epoxy curing agent to deionized water and stir at 300-500 rpm for 8-12 minutes to obtain component B; S3. When using, mix component A obtained in step S1 and component B obtained in step S2 at room temperature and stir at 300-400 rpm for 20-30 minutes to obtain an environmentally friendly high-temperature resistant and wear-resistant epoxy resin anti-corrosion coating.

10. The preparation method according to claim 9, characterized in that, The epoxy curing agent is a nonionic epoxy curing agent.

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