A wear-resistant protective coating for the surface of water treatment equipment and its application

Abstract

The present application relates to the technical field of protective coatings, and specifically discloses a wear-resistant protective coating for the surface of water treatment equipment and its application. The wear-resistant protective coating for the surface of water treatment equipment provided in the present application includes a primer coating, a mid-coat coating and a top-coat coating; wherein the primer coating includes E-44 epoxy resin, anti-rust filler, and polyamide curing agent; the mid-coat coating includes E-51 epoxy resin, wear-resistant filler, anti-seepage enhancer, and polyamide curing agent; the top-coat coating includes aliphatic polyurethane resin, wear-resistant filler, trimer curing agent, ultraviolet absorber, silica, and leveling agent; the present application also provides a construction method for the wear-resistant protective coating on the surface of the above-mentioned water treatment equipment. The wear-resistant protective coating provided in the present application has excellent wear resistance, chemical corrosion resistance and adhesion strength, and can meet the external protection requirements of water treatment equipment under complex working and transportation conditions.

Description

Technical Field

[0001] The present application relates to the technical field of protective coatings, and in particular to a wear-resistant protective coating for the surface of water treatment equipment and its application. Background Art

[0002] Water treatment equipment is a vital component of modern industry and life. With technological advancements, demands for durability and aesthetics continue to rise. To meet this demand, the industry is placing significant emphasis on protecting and beautifying equipment casings. Traditional protection methods rely primarily on applying coatings to the casing to create a functional protective film. This approach not only effectively isolates the impact of external environmental factors but also significantly enhances the product's overall aesthetics and market competitiveness.

[0003] In order to achieve a good protection effect, the following methods are mainly used in actual applications: First, use coatings with multiple functions, such as anti-corrosion, wear resistance and strength, to coat the surface of the equipment so that it can resist external physical damage; second, by adding different types of fillers to enhance specific properties, such as adding metal powder or other chemicals to change chemical stability or mechanical properties. Third, combine special processing methods such as high-temperature baking and shaping to ensure that the coating is firmly attached to the substrate. However, the above methods are difficult to take into account the comprehensive protection needs under complex working conditions. For example, in the transportation and installation links, when facing frequent transportation, impacts, wear and tear caused by operational errors, the existing coatings are often prone to damage, which not only affects the visual beauty of the product, but also weakens the effective barrier effect on the internal structure. In particular, long-term exposure in outdoor environments is more likely to cause early failure problems, which in turn affects the normal operation of the entire equipment and even shortens its service life.

[0004] Therefore, it is of great significance to develop a protective coating that is wear-resistant and has strong adhesion. Summary of the Invention

[0005] In order to overcome the problems of poor wear resistance and adhesion of existing wear-resistant protective coatings under complex working conditions, the present application provides a wear-resistant protective coating for the surface of water treatment equipment.

[0006] In a first aspect, the present application provides a wear-resistant protective coating for the surface of water treatment equipment, which adopts the following technical solution:

[0007] A wear-resistant protective coating for the surface of water treatment equipment, comprising a primer coating, a mid-coat coating and a top-coat coating;

[0008] The base coating comprises the following components in parts by weight: 40-60 parts of E-44 epoxy resin, 20-30 parts of rust-proof filler, 5-15 parts of polyamide curing agent and 5-10 parts of solvent I;

[0009] The mid-coat coating comprises the following components in parts by weight: 40-50 parts of E-51 epoxy resin, 20-30 parts of wear-resistant filler, 10-15 parts of anti-permeation enhancer, 5-10 parts of polyamide curing agent and 1-3 parts of solvent II;

[0010] The topcoat coating comprises the following components in parts by weight: 55-65 parts of aliphatic polyurethane resin, 5-10 parts of wear-resistant filler, 20-30 parts of trimer curing agent, 0.8-1.5 parts of ultraviolet absorber, 0.3-0.5 parts of silicon dioxide, 0.3-0.6 parts of leveling agent, and 4-6 parts of solvent III.

[0011] The present application provides a wear-resistant protective coating for the surface of water treatment equipment. The base coat of the wear-resistant protective coating adopts E-44 epoxy resin as the main film-forming substance, and is combined with anti-rust filler and polyamide curing agent, which can effectively enhance the adhesion of the coating to the substrate, and at the same time has good corrosion resistance, thereby extending the service life of the equipment. The middle coat uses E-51 epoxy resin as the base material, combined with wear-resistant fillers and anti-seepage enhancers, which greatly improves the overall mechanical strength and anti-penetration performance of the coating, and further improves the ability of the coating to resist external damage. The top coat is prepared using aliphatic polyurethane resin as the main body, and an appropriate amount of wear-resistant filler, silica, ultraviolet absorber and leveling agent is added. It not only gives the coating excellent wear resistance and weather resistance, but also ensures the surface finish and flatness of the coating, and has both beautiful decorative functions. In summary, the present application adjusts the components and addition amounts of the base coat, middle coat and top coat to the above range, and the wear-resistant protective coating with a three-layer composite structure has excellent wear resistance, chemical corrosion resistance and adhesion strength, which is particularly suitable for the external protection needs of water treatment equipment under various complex working and transportation conditions.

[0012] Optionally, the wear-resistant filler is selected from one or more of boron carbide, silicon carbide, aluminum oxide, zirconium oxide, potassium titanate whiskers and molybdenum disulfide.

[0013] Optionally, the wear-resistant filler is a mixture of silicon carbide, potassium titanate whiskers and molybdenum disulfide.

[0014] This application uses a mixture of silicon carbide, potassium titanate whiskers and molybdenum disulfide as wear-resistant filler, which can significantly improve the wear resistance of the coating while taking into account the toughness and lubrication properties, effectively reducing the risk of damage caused by friction or impact, and extending the service life of the protective coating.

[0015] Optionally, the weight ratio of silicon carbide, potassium titanate whiskers and molybdenum disulfide is 6:(1-3):(0.5-1.5).

[0016] In some embodiments, the weight ratio of silicon carbide, potassium titanate whiskers, and molybdenum disulfide is 6:(1-2):1, 6:(1-3):1, 6:2:(0.5-1), or 6:2:(1-1.5).

[0017] In a specific embodiment, the weight ratio of silicon carbide, potassium titanate whiskers and molybdenum disulfide is 6:1:1, 6:2:1, 6:3:1, 6:2:0.5 or 6:2:1.5.

[0018] Optionally, the anti-rust filler is mica iron oxide; the anti-seepage enhancer is glass flakes; the ultraviolet absorber is Tinuvin 292, and the leveling agent is BYK-306.

[0019] Optionally, the solvent I is a mixture of xylene and n-butanol; the solvent II is a mixture of xylene and acetone; and the solvent III is a mixture of butyl acetate / propylene glycol methyl ether acetate.

[0020] In a second aspect, the present application provides an application of a wear-resistant protective coating on the surface of water treatment equipment.

[0021] Optionally, the construction process of the wear-resistant protective coating includes the following steps:

[0022] First, the surface of the water treatment equipment substrate is pretreated; then, the primer coating is sprayed onto the surface of the equipment substrate, the wet film thickness of the primer coating is 80-100 μm, and it is cured at 20-30°C for 20-30 hours; then, the mid-coat coating is scraped or sprayed onto the cured surface of the primer coating, the wet film thickness of the mid-coat coating is 120-140 μm, and it is cured at 20-30°C for 45-60 hours; finally, the cured mid-coat is polished, and then the topcoat coating is sprayed, the wet film thickness of the topcoat coating is 60-80 μm, and it is cured at 20-30°C for 65-80 hours.

[0023] Optionally, the film thickness of the primer layer formed on the surface of the water treatment equipment is 60-80 μm, the film thickness of the mid-coat layer is 100-120 μm, and the film thickness of the topcoat layer is 50-70 μm.

[0024] In summary, this application has the following beneficial effects:

[0025] 1. The present application provides a wear-resistant protective coating comprising a basecoat comprising E-44 epoxy resin, rust-proof filler, and polyamide curing agent; a midcoat comprising E-51 epoxy resin, wear-resistant filler, anti-seepage enhancer, and polyamide curing agent; and a topcoat comprising aliphatic polyurethane resin, wear-resistant filler, trimer curing agent, UV absorber, silica, and leveling agent. The wear-resistant protective coating can form a three-layer composite structure on the surface of water treatment equipment, thereby providing excellent protection for the water treatment equipment and meeting the external protection requirements of the water treatment equipment under complex operating and transportation conditions.

[0026] 2. This application further uses silicon carbide, potassium titanate whiskers and molybdenum disulfide as wear-resistant fillers. The obtained wear-resistant protective coating is coated on the surface of the substrate of water treatment equipment. After 1000-turn wear test, the loss is ≤35mg, and the wear resistance is better. DETAILED DESCRIPTION

[0027] The present application provides a wear-resistant protective coating for the surface of water treatment equipment, comprising a primer coating, a mid-coat coating and a top-coat coating; the primer coating comprises the following components in parts by weight: 40-60 parts of E-44 epoxy resin, 20-30 parts of rust-proof filler, 5-15 parts of polyamide curing agent and 5-10 parts of solvent I; the mid-coat coating comprises the following components in parts by weight: 40-50 parts of E-51 epoxy resin, 20-30 parts of wear-resistant filler, 10-15 parts of anti-permeation enhancer, 5-10 parts of polyamide curing agent and 1-3 parts of solvent II; the top-coat coating comprises the following components in parts by weight: 55-65 parts of aliphatic polyurethane resin, 5-10 parts of wear-resistant filler, 20-30 parts of trimer curing agent, 0.8-1.5 parts of ultraviolet absorber, 0.3-0.5 parts of silica, 0.3-0.6 parts of leveling agent and 4-6 parts of solvent III.

[0028] The wear-resistant filler is selected from one or more of boron carbide, silicon carbide, aluminum oxide, zirconium oxide, potassium titanate whiskers, and molybdenum disulfide; the rust-proof filler is mica iron oxide; the impermeability enhancer is glass flakes; the UV absorber is Tinuvin 292; and the leveling agent is BYK-306; the solvent I is a mixture of xylene and n-butanol; the solvent II is a mixture of xylene and acetone; and the solvent III is a mixture of butyl acetate and propylene glycol methyl ether acetate. Furthermore, the wear-resistant filler is a mixture of silicon carbide, potassium titanate whiskers, and molybdenum disulfide. Furthermore, the weight ratio of silicon carbide, potassium titanate whiskers, and molybdenum disulfide is 6:(1-3):(0.5-1.5).

[0029] The present application provides a method for preparing a wear-resistant protective coating, comprising the following steps:

[0030] (1) Primer coating: adding anti-rust filler, E-44 epoxy resin, and polyamide curing agent to solvent I, mixing and stirring uniformly to obtain a primer coating;

[0031] (2) Middle coating: First, the wear-resistant filler and the anti-permeation enhancer are uniformly dispersed in solvent II, and then E-51 epoxy resin and polyamide curing agent are added, mixed and stirred evenly to obtain the base coating;

[0032] (3) Topcoat: First, evenly disperse the wear-resistant filler, ultraviolet absorber, and silica into solvent III, and then add aliphatic polyurethane resin, trimer curing agent, and leveling agent, mix and stir evenly to obtain a basecoat.

[0033] The present application provides a construction process for the wear-resistant protective coating, comprising the following steps:

[0034] First, the surface of the water treatment equipment substrate is pretreated; then, the primer coating is sprayed onto the surface of the equipment substrate, the wet film thickness of the primer coating is 80-100 μm, and it is cured at 20-30°C for 20-30 hours; then, the mid-coat coating is scraped or sprayed onto the cured surface of the primer coating, the wet film thickness of the mid-coat coating is 120-140 μm, and it is cured at 20-30°C for 45-60 hours; finally, the cured mid-coat is polished, and then the topcoat coating is sprayed, the wet film thickness of the topcoat coating is 60-80 μm, and it is cured at 20-30°C for 65-80 hours.

[0035] In the present application, the material of the water treatment equipment base material is carbon steel.

[0036] The raw materials, reagents, solvents, etc. used in this application can be obtained commercially.

[0037] The present application is further described in detail below with reference to preparation examples, embodiments, and performance testing.

[0038] Preparation Examples 1-7

[0039] Preparation Examples 1-7 each provide a wear-resistant protective coating.

[0040] The difference between the above preparation examples is that the addition amount of each component in the wear-resistant protective coating is shown in Table 1 below.

[0041] The preparation method of the wear-resistant protective coating provided in Preparation Example 1 is:

[0042] (1) Primer coating: E-44 epoxy resin, anti-rust filler, and polyamide curing agent were added to solvent I (xylene and n-butanol in a volume ratio of 7:3), and the mixture was mixed and stirred to obtain a primer coating;

[0043] (2) Middle coating: First, the wear-resistant filler and the anti-permeation enhancer are uniformly dispersed in solvent II (xylene and acetone with a volume ratio of 6:4), and then E-51 epoxy resin and polyamide curing agent are added, mixed and stirred evenly to obtain the base coating;

[0044] (3) Topcoat coating: First, the wear-resistant filler, ultraviolet absorber, and silica are evenly dispersed in solvent III (butyl acetate and propylene glycol methyl ether acetate in a volume ratio of 8:2), and then aliphatic polyurethane resin, trimer curing agent, and leveling agent are added, mixed and stirred evenly to obtain a basecoat coating.

[0045] Table 1 Addition amount of each layer of the wear-resistant protective coating provided in Preparation Examples 1-7

[0046]

[0047]

[0048] Preparation Example 8-17

[0049] Preparation Examples 8-17 each provide a wear-resistant protective coating.

[0050] The difference between the above preparation example and preparation example 1 is that the types and ratios of wear-resistant fillers in the middle coating and the top coating are shown in Table 2 below.

[0051] Table 2 Types and ratios of wear-resistant fillers in the middle coating and top coating of the wear-resistant protective coatings provided in Preparation Examples 8-17

[0052]

[0053]

[0054] Comparative Preparation Example 1

[0055] Comparative Preparation Example 1 provides a wear-resistant protective coating.

[0056] The difference between the comparative preparation example and preparation example 1 is that the wear-resistant protective coating does not include a primer coating.

[0057] Comparative Preparation Example 2

[0058] Comparative Preparation Example 2 provides a wear-resistant protective coating.

[0059] The difference between the above comparative preparation example and preparation example 1 is that the wear-resistant protective coating does not include a mid-coat coating.

[0060] Examples 1-17

[0061] The wear-resistant protective coating was sprayed on the water treatment equipment substrate. The coatings used in Examples 1-17 were respectively from Preparation Examples 1-17. The construction process included the following steps:

[0062] First, the surface of the water treatment equipment substrate is pretreated; then the primer coating is sprayed onto the surface of the water treatment equipment substrate (carbon steel), the wet film thickness of the primer coating is 90 μm, and it is cured at 25°C for 24 hours; then the mid-coat coating is scraped or sprayed onto the cured surface of the primer coating, the wet film thickness of the mid-coat coating is 130 μm, and it is cured at 25°C for 48 hours; finally, the cured mid-coat is polished, and then the topcoat coating is sprayed, the wet film thickness of the topcoat coating is 70 μm, and it is cured at 25°C for 72 hours.

[0063] After construction according to the method of Example 1-17, the film thickness of the primer layer formed on the surface of the water treatment equipment is 87±3 μm, the film thickness of the middle coating layer is 112±5 μm, and the film thickness of the top coating layer is 61±2 μm.

[0064] Comparative Example 1-2

[0065] The wear-resistant protective coating was sprayed on the water treatment equipment substrate, and the coatings used in Comparative Examples 1-2 were respectively derived from Comparative Preparation Examples 1-2.

[0066] After construction according to the method of Comparative Example 1-2, the film thickness of the primer layer formed on the surface of the water treatment equipment is 88±2μm, the film thickness of the middle coating layer is 112±5μm, and the film thickness of the top coating layer is 60±3μm.

[0067] Comparative Example 3

[0068] The wear-resistant protective coating provided in Example 1 was sprayed on the substrate of the water treatment equipment. The difference from Example 1 was that the wet film thickness of the primer coating was 50 μm, the wet film thickness of the mid-coat coating was 80 μm, and the wet film thickness of the topcoat coating was 50 μm.

[0069] After construction according to the method of Comparative Example 3, the film thickness of the primer layer formed on the surface of the water treatment equipment is 41±3 μm, the film thickness of the middle coating layer is 65±4 μm, and the film thickness of the top coating layer is 43±2 μm.

[0070] Comparative Example 4

[0071] The wear-resistant protective coating provided in Comparative Example 4 was sprayed on the shell substrate of the water treatment equipment. The difference from Example 1 was that the wet film thickness of the primer coating was 120 μm, the wet film thickness of the mid-coat coating was 150 μm, and the wet film thickness of the topcoat coating was 100 μm.

[0072] After construction according to the method of Comparative Example 4, the film thickness of the primer layer formed on the surface of the water treatment equipment is 106±5 μm, the film thickness of the middle coating layer is 134±7 μm, and the film thickness of the top coating layer is 90±4 μm.

[0073] Performance testing

[0074] The wear resistance, adhesion and salt spray resistance of the device housings after coating of Examples 1-17 and Comparative Examples 1-4 were tested, and the results are shown in Table 3 below.

[0075] Table 3 Performance test results of the equipment housing obtained in Examples 1-17 and Comparative Examples 1-4

[0076]

[0077]

[0078] According to the test results in Table 3, the wear-resistant protective coating provided in Preparation Examples 1-17 of the present application is applied to the surface of the substrate of the water treatment equipment. After 1000 revolutions of wear resistance test, the loss is 26-48 mg, the adhesion level is 0, and the salt spray resistance time is 1416-1584 h; while the wear-resistant protective coating provided in Comparative Preparation Examples 1-3 is applied to the surface of the substrate of the water treatment equipment. After 1000 revolutions of wear resistance test, the loss is as high as 55-74 mg, the adhesion level is 0-2, and the salt spray resistance time is only 1320-1368 h; the wear-resistant protective coating provided in Comparative Preparation Example 4 is applied to the surface of the substrate of the water treatment equipment. After 1000 revolutions of wear resistance test, the adhesion level is 2. Therefore, it is shown that the wear-resistant protective coating provided in the present application has good wear resistance, adhesion and salt spray resistance, and its application on the surface of water treatment equipment can achieve good protective effect.

[0079] Further comparison of the test results of Example 1 and Examples 8-17 shows that Examples 1 and Examples 8-10 use silicon carbide, boron carbide, potassium titanate whiskers or molybdenum disulfide as wear-resistant fillers, and the obtained wear-resistant protective coating is applied to the surface of the water treatment equipment substrate. After 1000 revolutions of wear resistance test, the loss is 42-48 mg; Examples 16-17 use boron carbide, potassium titanate whiskers and molybdenum disulfide in a weight ratio of 6:2:1 or silicon carbide, boron carbide in a weight ratio of 6:2:1. and molybdenum disulfide as wear-resistant fillers, the resulting wear-resistant protective coating is applied to the surface of the water treatment equipment substrate, and the loss after 1000-turn wear test is 36-38 mg; while Examples 11-15 use silicon carbide, potassium titanate whiskers and molybdenum disulfide in a weight ratio of 6: (1-3): (0.5-1.5) as wear-resistant fillers, and the resulting wear-resistant protective coating is applied to the surface of the water treatment equipment substrate, and the loss after 1000-turn wear test is 26-33 mg (≤35 mg). Therefore, it is explained that the present application further uses silicon carbide, potassium titanate whiskers and molybdenum disulfide as wear-resistant fillers, and controls their weight ratio within the range of 6: (1-3): (0.5-1.5), and the wear-resistant protective coating obtained has better wear resistance.

[0080] Although the present invention has been described in detail above using general descriptions and specific embodiments, it will be apparent to those skilled in the art that modifications and improvements may be made based on the present invention. Therefore, such modifications and improvements, which do not depart from the spirit of the present invention, are intended to be within the scope of protection claimed herein.

Claims

1. A wear-resistant protective coating for the surface of water treatment equipment, characterized in that: Including base coating paint, mid-coat paint and top coating paint; The base coating comprises the following components in parts by weight: 40-60 parts of E-44 epoxy resin, 20-30 parts of rust-proof filler, 5-15 parts of polyamide curing agent and 5-10 parts of solvent I; The mid-coat coating comprises the following components in parts by weight: 40-50 parts of E-51 epoxy resin, 20-30 parts of wear-resistant filler, 10-15 parts of anti-permeation enhancer, 5-10 parts of polyamide curing agent and 1-3 parts of solvent II; The topcoat coating comprises the following components in parts by weight: 55-65 parts of aliphatic polyurethane resin, 5-10 parts of wear-resistant filler, 20-30 parts of trimer curing agent, 0.8-1.5 parts of ultraviolet absorber, 0.3-0.5 parts of silicon dioxide, 0.3-0.6 parts of leveling agent, and 4-6 parts of solvent III; The wear-resistant filler is a mixture of silicon carbide, potassium titanate whiskers and molybdenum disulfide; the weight ratio of the silicon carbide, potassium titanate whiskers and molybdenum disulfide is 6: (2-3): (0.5-1).

2. The wear-resistant protective coating according to claim 1, characterized in that: The anti-rust filler is mica iron oxide; the anti-seepage enhancer is glass flakes; the ultraviolet absorber is Tinuvin 292; and the leveling agent is BYK-306.

3. The wear-resistant protective coating according to claim 1, characterized in that: The solvent I is a mixture of xylene and n-butanol; the solvent II is a mixture of xylene and acetone; and the solvent III is a mixture of butyl acetate and propylene glycol methyl ether acetate.

4. Use of the wear-resistant protective coating according to any one of claims 1 to 3 on the surface of water treatment equipment.

5. The use according to claim 4, characterized in that The construction process of the wear-resistant protective coating comprises the following steps: First, the surface of the water treatment equipment substrate is pretreated; then, the primer coating is sprayed onto the surface of the equipment substrate, the wet film thickness of the primer coating is 80-100 μm, and it is cured at 20-30°C for 20-30 hours; then, the mid-coat coating is scraped or sprayed onto the cured surface of the primer coating, the wet film thickness of the mid-coat coating is 120-140 μm, and it is cured at 20-30°C for 45-60 hours; finally, the cured mid-coat is polished, and then the topcoat coating is sprayed, the wet film thickness of the topcoat coating is 60-80 μm, and it is cured at 20-30°C for 65-80 hours.

6. The use according to claim 5, characterized in that The film thickness of the primer layer formed on the surface of the water treatment equipment is 60-80 μm, the film thickness of the middle coating layer is 100-120 μm, and the film thickness of the top coating layer is 50-70 μm.

7. The use according to claim 5, characterized in that The water treatment equipment base material is made of carbon steel.

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