Inorganic acid-proof wear-resistant coating and preparation method thereof

Abstract

The invention relates to the technical field of coatings, in particular to an inorganic acid-proof wear-resistant coating and a preparation method thereof. The inorganic acid-proof wear-resistant coating is prepared from the following raw materials in parts by mass: 10 to 30 parts of binding agent, 40 to 60 parts of emery powder, 15 to 40 parts of silicon carbide, 2 to 8 parts of aluminum oxide micro powder, 2 to 8 parts of nano silicon dioxide, 1 to 10 parts of Guangxi soil, 0.1 to 2 parts of sodium fluosilicate and 1 to 40 parts of water, the invention discloses an inorganic acid-proof wear-resistant coating and a preparation method thereof, and the inorganic acid-proof wear-resistant coating prepared by the method has good adhesion, corrosion resistance, hardness, wear resistance, impact resistance and high temperature resistance.

Description

Technical Field

[0001] The present application relates to the technical field of coatings, and in particular to an inorganic acid-proof and wear-resistant coating and a preparation method thereof. Background Art

[0002] As a key functional protective material, acid-proof and wear-resistant coatings are widely used in the protection of core equipment in industrial fields such as metallurgy, chemical industry, and environmental protection. They play an important role in the protection of the inner walls of equipment such as flues and reaction towers under various high-temperature and strong corrosion conditions. The quality of their performance directly affects the service life, operational stability and maintenance cost of the equipment. High-quality acid-proof and wear-resistant coatings can effectively block the erosion of acidic media by forming a dense protective layer, while resisting the erosion of high-speed airflow or solid particles. This reduces the frequency of equipment shutdowns and maintenance due to corrosion perforation and wear, and reduces labor and material consumption and production interruption losses caused by frequent maintenance. It is of great significance to the economy and safety of industrial equipment.

[0003] The acid-proof and wear-resistant coating in the prior art is prepared by using phenolic resin as a binder, adding fillers and curing agents. The prepared acid-proof and wear-resistant coating is costly, not resistant to high temperatures, flammable, and produces harmful gases when burned. It is not suitable for fire prevention and high-temperature occasions.

[0004] Therefore, the organic binder-type acid-proof and wear-resistant coatings prepared in the existing technology can no longer meet the long-term protection needs of key equipment in the fields of metallurgy, chemical industry, etc. under high temperature, strong corrosion, and high wear conditions. It is urgent to develop a new type of high-performance acid-proof and wear-resistant coating to break through the technical bottleneck. Summary of the Invention

[0005] In view of the deficiencies in the prior art, the present application provides an inorganic acid-proof and wear-resistant coating and a preparation method thereof.

[0006] In the first aspect, the present application provides an inorganic acid-proof and wear-resistant coating, which adopts the following technical solution: An inorganic acid-proof and wear-resistant coating comprises the following raw materials in parts by mass: 10-30 parts of a binder, 40-60 parts of corundum powder, 15-40 parts of silicon carbide, 2-8 parts of alumina micropowder, 2-8 parts of nano-silicon dioxide, 1-10 parts of Guangxi soil, 0.1-2 parts of sodium fluorosilicate and 1-40 parts of water.

[0007] Preferably, the inorganic acid-proof and wear-resistant coating comprises the following raw materials in parts by mass: 10-25 parts of binder, 45-55 parts of corundum powder, 20-35 parts of silicon carbide, 3-5 parts of alumina powder, 3-5 parts of nano-silicon dioxide, 4-7 parts of Guangxi soil, 0.5-1.5 parts of sodium fluorosilicate and 5-30 parts of water.

[0008] By adopting the above technical solution, an inorganic binder is added in the present application, and solid water glass or liquid water glass is used as a binder. Water glass has good high temperature resistance and acid resistance, which further improves the high temperature resistance and acid resistance of the coating.

[0009] This application improves the raw materials by adding silicon carbide and corundum powder; silicon carbide and corundum powder have wear resistance, which further improves the wear resistance of the coating. Silicon carbide has good thermal conductivity and the coating does not crack; nano-silicon dioxide is added to effectively improve the bonding strength and density of the coating; alumina micropowder and Guangxi soil are added, and alumina micropowder and Guangxi soil are used as thickeners to effectively prevent the coating from settling.

[0010] This application improves the raw materials and adds sodium fluorosilicate as a curing agent, which effectively promotes the formation and stability of the coating and accelerates the curing of the coating. Preferably, the binder is liquid water glass or solid water glass.

[0011] Preferably, the inorganic acid-proof and wear-resistant coating further comprises 10-20 parts of filler.

[0012] Preferably, the filler comprises the following raw materials in parts by mass: 8-12 parts of silicon carbide fine powder, 50-80 parts of silicon carbide coarse powder, 0.2-0.8 parts of silane coupling agent, 100-130 parts of sodium polystyrene sulfonate, 100-150 parts of modified nano-silica and 5-15 parts of silver nitrate.

[0013] Preferably, the particle size of the silicon carbide fine powder is 2-6 μm, and the particle size of the silicon carbide coarse powder is 106-180 μm.

[0014] By adopting the above technical solution, the present application improves the raw materials, first using a silane coupling agent to chemically react with the silanol groups on the surface of the silicon carbide fine powder, and chemically modifying the surface of the silicon carbide fine powder, and then mixing it with sodium polystyrene sulfonate to achieve surface modification of the silicon carbide fine powder; Mixing the surface-modified silicon carbide fine powder with silicon carbide coarse powder to prepare a first mixture having high temperature resistance, corrosion resistance, and wear resistance; Mixing modified nano-silicon dioxide and silver nitrate to obtain a second mixture having good mechanical properties, thermal properties and wear resistance; The first mixture and the second mixture are mixed to obtain a filler with good mechanical properties, thermal properties, high temperature resistance, corrosion resistance and wear resistance, so that the prepared coating has good high temperature resistance, corrosion resistance and wear resistance as well as comprehensive properties.

[0015] Preferably, the modified nano-silica comprises the following raw materials in parts by mass: 60-120 parts of ethanol, 2-6 parts of ammonia water, 0.4-0.8 parts of ethylenediamine, 0.5-2 parts of 3-aminophenol, 1-3 parts of formaldehyde, 3-7 parts of ethyl orthosilicate, 60-100 parts of toluene, 0.1-1 parts of 3-aminopropyltriethoxysilane and 30-50 parts of nano-silica.

[0016] Preferably, the preparation method of the modified nano-silica comprises the following steps: Ethanol, ammonia water and ethylenediamine are mixed, 3-aminophenol, formaldehyde and ethyl orthosilicate are added and mixed, nano-silica is added and mixed, centrifuged and dried, toluene is added and mixed, and 3-aminopropyltriethoxysilane is added and mixed to obtain modified nano-silica.

[0017] By adopting the above technical solution, in the present application, the surface of the nano-silica is modified to achieve surface functionalization modification, thereby improving the reaction activity and binding ability of the nano-silica.

[0018] Preferably, the preparation method of the filler comprises the following steps: Mixing silicon carbide fine powder and a silane coupling agent, adding sodium polystyrene sulfonate and mixing, and then adding silicon carbide coarse powder and mixing to obtain a first mixture; Mixing the modified nano-silica with silver nitrate to obtain a second mixture; The first mixture and the second mixture are mixed and then dried to obtain a filler.

[0019] By adopting the above technical solution, the raw materials of the filler are improved in this application to prepare a filler with good mechanical properties, high temperature resistance, corrosion resistance and wear resistance, so that the prepared coating has good high temperature resistance, corrosion resistance and wear resistance as well as comprehensive performance.

[0020] In this application, the surface properties of silicon carbide fine powder are regulated by surface modification, the interfacial interaction between silicon carbide fine powder and silicon carbide coarse powder is enhanced, and the filling effect of silicon carbide fine powder is utilized to optimize the microstructure of the mixed system, thereby further improving the density and mechanical properties of the coating. In a second aspect, the present application provides a method for preparing an inorganic acid-proof and wear-resistant coating, which adopts the following technical solution: A method for preparing an inorganic acid-proof and wear-resistant coating comprises the following steps: Weigh each raw material according to the formula; The binder, corundum powder, silicon carbide, aluminum oxide powder, nano silicon dioxide, Guangxi soil, sodium fluorosilicate, water and filler are mixed to obtain an inorganic acid-proof and wear-resistant coating.

[0021] To sum up, the present application includes at least one of the following beneficial technical effects: The present application discloses an inorganic acid-proof wear-resistant coating and a preparation method thereof. The inorganic acid-proof wear-resistant coating prepared by the method has good adhesion, corrosion resistance, hardness, wear resistance, impact resistance and high temperature resistance. DETAILED DESCRIPTION

[0022] The technical solutions of the present application are further illustrated by specific examples below, which do not represent a limitation on the scope of protection of the present application; some non-essential modifications and adjustments made by others according to the concept of the present application still fall within the scope of protection of the present application.

[0023] The raw materials involved in the present application are all commercially available products, among which, The silicon carbide fine powder and the silicon carbide coarse powder are purchased from Gongyi Mingyu Refractory Material Co., Ltd.

[0024] Sodium polystyrene sulfonate, cas number: 25704-18-1, purchased from Hubei Xingdongcheng Chemical Co., Ltd.; Nano-silicon dioxide, cas number: 7631-86-9, purchased from Aladdin; Liquid water glass, purchased from Guangzhou Tongxin Chemical Co., Ltd.; Solid water glass, purchased from Henan Wanshan New Material Technology Co., Ltd.; Corundum powder, white corundum powder, purchased from Gongyi Yuying Refractory Material Co., Ltd.; Alumina micropowder, purchased from Qinghe County Chaotai Metal Material Co., Ltd.; Guangxi clay, Guangxi white clay 54, purchased from Gongyi Jiahong Refractory Material Co., Ltd.; Sodium fluorosilicate, purchased from Jinan Xinrunyuan Chemical Technology Co., Ltd.; The present application is further described in detail below in combination with examples and comparative examples.

[0025] Preparation Example 1: Preparation of modified nano-silicon dioxide: The modified nano-silicon dioxide comprises the following raw materials: ethanol 85g, ammonia water 4g, ethylenediamine 0.6g, 3-aminophenol 1g, formaldehyde 1.5g, tetraethyl orthosilicate 5g, toluene 80g, 3-aminopropyl triethoxysilane (silane coupling agent KH550) 0.5g and nano-silicon dioxide 40g.

[0026] The preparation method of the modified nano-silicon dioxide is as follows: Mix 50 mL of ethanol, ammonia water, ethylenediamine, and water, heat to 40°C, add 3-aminophenol, formaldehyde, and ethyl orthosilicate and mix, then add nano-silica and mix for 4 hours, collect the product by centrifugation, wash twice with ethanol, vacuum dry, and calcine at 550°C for 1 hour, grind the product, add toluene and mix, ultrasonically treat for 20 minutes, magnetically stir the mixture at 80°C for 20 minutes, then add 3-aminopropyltriethoxysilane and mix for 5 hours, centrifuge, and wash with ethanol to obtain modified nano-silica.

[0027] Preparation Example 2: Preparation of modified nano-silica: The modified nano-silica includes the following raw materials: 60g ethanol, 2g ammonia water, 0.4g ethylenediamine, 0.5g 3-aminophenol, 1g formaldehyde, 3g ethyl orthosilicate, 60g toluene, 0.1g 3-aminopropyltriethoxysilane (silane coupling agent KH550) and 30g nano-silica.

[0028] The preparation method of modified nano-silica comprises the following steps: 40 mL of ethanol, ammonia water, ethylenediamine and water were mixed and heated to 40°C. 3-aminophenol, formaldehyde and ethyl orthosilicate were added and mixed, and then nano-silica was added and mixed for 4 hours. The product was collected by centrifugation, washed twice with ethanol, vacuum-dried, and calcined at 550°C for 1 hour. The product was ground and pulverized, and toluene was added and mixed. After ultrasonic treatment for 20 minutes, the mixture was magnetically stirred at 80°C for 20 minutes, and then 3-aminopropyltriethoxysilane was added and mixed for 5 hours. The mixture was centrifuged and washed with ethanol to obtain modified nano-silica.

[0029] Preparation Example 3: Preparation of modified nano-silica: The modified nano-silica includes the following raw materials: 120g ethanol, 6g ammonia water, 0.8g ethylenediamine, 2g 3-aminophenol, 3g formaldehyde, 7g ethyl orthosilicate, 100g toluene, 1g 3-aminopropyltriethoxysilane (silane coupling agent KH550) and 50g nano-silica.

[0030] The preparation method of modified nano-silica comprises the following steps: Mix 100 mL of ethanol, ammonia water, ethylenediamine, and water, heat to 40°C, add 3-aminophenol, formaldehyde, and ethyl orthosilicate and mix, then add nano-silica and mix for 4 hours, collect the product by centrifugation, wash twice with ethanol, vacuum dry, and calcine at 550°C for 1 hour, grind the product, add toluene and mix, ultrasonicate for 20 minutes, magnetically stir the mixture at 80°C for 20 minutes, then add 3-aminopropyltriethoxysilane and mix for 5 hours, centrifuge, and wash with ethanol to obtain modified nano-silica.

[0031] Preparation Example 4: Preparation of filler: The filler includes the following raw materials: 10 g of silicon carbide fine powder, 65 g of silicon carbide coarse powder, 0.5 g of silane coupling agent KH550, 115 g of sodium polystyrene sulfonate, 130 g of modified nano-silica, and 10 g of silver nitrate.

[0032] The particle size of the silicon carbide fine powder is 5 μm, and the particle size of the silicon carbide coarse powder is 150 μm.

[0033] The modified nano-silica was prepared according to Preparation Example 1.

[0034] The preparation method of the filler comprises the following steps: Silane coupling agent KH550 was dissolved in water to obtain a solution with a concentration of 0.5 wt %, silicon carbide fine powder was added to the solution, nitric acid (or sodium hydroxide) was added to adjust the pH to 6, and the mixture was mixed for 20 minutes to obtain product 1; Sodium polystyrene sulfonate was dissolved in water to obtain a solution having a concentration of 0.8 wt %, product 1 was added to the solution and mixed, and then coarse silicon carbide powder was added and mixed to obtain product 2; The modified nano-silica was dispersed in 50 mL of water, and silver nitrate was added and mixed to obtain product 3; Product 2 and product 3 are mixed, centrifuged, washed, and vacuum-dried to obtain a filler.

[0035] Preparation Example 5: Preparation of filler: The filler includes the following raw materials: 8 g of silicon carbide fine powder, 50 g of silicon carbide coarse powder, 0.2 g of silane coupling agent KH550, 100 g of sodium polystyrene sulfonate, 100 g of modified nano-silica, and 5 g of silver nitrate.

[0036] The particle size of the silicon carbide fine powder is 5 μm, and the particle size of the silicon carbide coarse powder is 150 μm.

[0037] The modified nano-silica was prepared according to Preparation Example 2.

[0038] The preparation method of the filler comprises the following steps: Silane coupling agent KH550 was dissolved in water to obtain a solution with a concentration of 0.5 wt %, silicon carbide fine powder was added to the solution, nitric acid (or sodium hydroxide) was added to adjust the pH to 6, and the mixture was mixed for 20 minutes to obtain product 1; Sodium polystyrene sulfonate was dissolved in water to obtain a solution having a concentration of 0.8 wt %, product 1 was added to the solution and mixed, and then coarse silicon carbide powder was added and mixed to obtain product 2; The modified nano-silica was dispersed in 50 mL of water, and silver nitrate was added and mixed to obtain product 3; Product 2 and product 3 are mixed, centrifuged, washed, and vacuum-dried to obtain a filler.

[0039] Preparation Example 6: Preparation of filler: The filler includes the following raw materials: 12 g of silicon carbide fine powder, 80 g of silicon carbide coarse powder, 0.8 g of silane coupling agent KH550, 130 g of sodium polystyrene sulfonate, 150 g of modified nano-silica, and 15 g of silver nitrate.

[0040] The particle size of the silicon carbide fine powder is 5 μm, and the particle size of the silicon carbide coarse powder is 150 μm.

[0041] The modified nano-silica was prepared according to Preparation Example 3.

[0042] The preparation method of the filler comprises the following steps: Silane coupling agent KH550 was dissolved in water to obtain a solution with a concentration of 0.5 wt %, silicon carbide fine powder was added to the solution, nitric acid (or sodium hydroxide) was added to adjust the pH to 6, and the mixture was mixed for 20 minutes to obtain product 1; Sodium polystyrene sulfonate was dissolved in water to obtain a solution having a concentration of 0.8 wt %, product 1 was added to the solution and mixed, and then coarse silicon carbide powder was added and mixed to obtain product 2; The modified nano-silica was dispersed in 50 mL of water, and silver nitrate was added and mixed to obtain product 3; Product 2 and product 3 are mixed, centrifuged, washed, and vacuum-dried to obtain a filler.

[0043] Example 1: Preparation of inorganic acid-resistant and wear-resistant coating: An inorganic acid-proof and wear-resistant coating comprises the following raw materials: 20g of a binder, 50g of corundum powder (325 mesh), 30g of silicon carbide (200 mesh), 5g of alumina micropowder (2-5μ), 5g of nano-silicon dioxide, 5g of Guangxi soil (180 mesh), 1g of sodium fluorosilicate (180 mesh), 25g of water, and 15g of a filler.

[0044] The filler is prepared by the preparation example 4.

[0045] The binding agent is solid water glass, 180 mesh.

[0046] A preparation method of the inorganic acid-proof wear-resistant coating, the preparation method comprises the following steps: The raw materials are weighed according to the formula; The binding agent, corundum powder, silicon carbide, alumina micropowder, nanometer silicon dioxide, Guangxi soil, sodium fluorosilicate, filler and water are mixed for 30 minutes to obtain the inorganic acid-proof wear-resistant coating.

[0047] Example 2: Preparation of the inorganic acid-proof wear-resistant coating: An inorganic acid-proof wear-resistant coating comprises the following raw materials: a binding agent 10 g, corundum powder (325 mesh) 40 g, silicon carbide (200 mesh) 15 g, alumina micropowder (2-5 μ) 2 g, nanometer silicon dioxide 2 g, Guangxi soil (180 mesh) 1 g, sodium fluorosilicate (180 mesh) 0.1 g, water 1 g and filler 10 g.

[0048] The filler is prepared by the preparation example 5.

[0049] The binding agent is liquid water glass, modulus 2.5, and silica content more than 20%.

[0050] A preparation method of the inorganic acid-proof wear-resistant coating, the preparation method comprises the following steps: The raw materials are weighed according to the formula; The binding agent, corundum powder, silicon carbide, alumina micropowder, nanometer silicon dioxide, Guangxi soil, sodium fluorosilicate, filler and water are mixed for 30 minutes to obtain the inorganic acid-proof wear-resistant coating.

[0051] Example 3: Preparation of the inorganic acid-proof wear-resistant coating: An inorganic acid-proof wear-resistant coating comprises the following raw materials: a binding agent 30 g, corundum powder (325 mesh) 60 g, silicon carbide (200 mesh) 40 g, alumina micropowder (2-5 μ) 8 g, nanometer silicon dioxide 8 g, Guangxi soil (180 mesh) 10 g, sodium fluorosilicate (180 mesh) 2 g, water 40 g and filler 20 g.

[0052] The filler is prepared by the preparation example 6.

[0053] The binding agent is solid water glass, 180 mesh.

[0054] A preparation method of the inorganic acid-proof wear-resistant coating, the preparation method comprises the following steps: The raw materials are weighed according to the formula; The binder, corundum powder, silicon carbide, aluminum oxide powder, nano silicon dioxide, Guangxi soil, sodium fluorosilicate, filler and water are mixed for 30 minutes to obtain an inorganic acid-proof and wear-resistant coating.

[0055] Example 4: Preparation of inorganic acid-resistant and wear-resistant coating: An inorganic acid-proof and wear-resistant coating comprises the following raw materials: 10g of a binder, 45g of corundum powder (325 mesh), 20g of silicon carbide (200 mesh), 3g of alumina micropowder (2-5μ), 3g of nano-silica, 4g of Guangxi soil (180 mesh), 0.5g of sodium fluorosilicate (180 mesh), 5g of water, and 10g of a filler.

[0056] The filler was prepared according to Preparation Example 4.

[0057] The binder is liquid water glass with a modulus of 2.5 and a silicon dioxide content exceeding 20%.

[0058] A method for preparing an inorganic acid-proof and wear-resistant coating comprises the following steps: Weigh each raw material according to the formula; The binder, corundum powder, silicon carbide, aluminum oxide powder, nano silicon dioxide, Guangxi soil, sodium fluorosilicate, water and filler are mixed for 30 minutes to obtain an inorganic acid-proof and wear-resistant coating.

[0059] Example 5: Preparation of inorganic acid-resistant and wear-resistant coating: An inorganic acid-proof and wear-resistant coating comprises the following raw materials: 25 g of a binder, 55 g of corundum powder (325 mesh), 35 g of silicon carbide (200 mesh), 5 g of alumina micropowder (2-5 μm), 5 g of nano-silicon dioxide, 7 g of Guangxi soil (180 mesh), 1.5 g of sodium fluorosilicate (180 mesh), 30 g of water, and 20 g of a filler.

[0060] The filler was prepared according to Preparation Example 4.

[0061] The binder is solid water glass, 180 mesh.

[0062] A method for preparing an inorganic acid-proof and wear-resistant coating comprises the following steps: Weigh each raw material according to the formula; The binder, corundum powder, silicon carbide, aluminum oxide powder, nano silicon dioxide, Guangxi soil, sodium fluorosilicate, water and filler are mixed for 30 minutes to obtain an inorganic acid-proof and wear-resistant coating.

[0063] Example 6: The difference from Example 1 is that the filler is prepared by Preparation Example 5.

[0064] Example 7: The difference from Example 1 is that the filler is prepared by Preparation Example 6.

[0065] Example 8: The difference from Example 1 is that the added amount of filler is 10 g.

[0066] Example 9: The difference from Example 1 is that the added amount of filler is 20 g.

[0067] Example 10: The difference from Example 1 is that when preparing the filler, the particle sizes of the silicon carbide fine powder and the particle sizes of the silicon carbide coarse powder are different.

[0068] In this embodiment, the filler includes the following raw materials: 10 g of silicon carbide fine powder, 65 g of silicon carbide coarse powder, 0.5 g of silane coupling agent KH550, 115 g of sodium polystyrene sulfonate, 130 g of modified nano-silica, and 10 g of silver nitrate.

[0069] The particle size of the silicon carbide fine powder is 2 μm, and the particle size of the silicon carbide coarse powder is 150 μm.

[0070] Example 11: The difference from Example 1 is that when preparing the filler, the particle sizes of the silicon carbide fine powder and the particle sizes of the silicon carbide coarse powder are different.

[0071] In this embodiment, the filler includes the following raw materials: 10 g of silicon carbide fine powder, 65 g of silicon carbide coarse powder, 0.5 g of silane coupling agent KH550, 115 g of sodium polystyrene sulfonate, 130 g of modified nano-silica, and 10 g of silver nitrate.

[0072] The particle size of the silicon carbide fine powder is 6 μm, and the particle size of the silicon carbide coarse powder is 150 μm.

[0073] Example 12: The difference from Example 1 is that when preparing the filler, the particle sizes of the silicon carbide fine powder and the particle sizes of the silicon carbide coarse powder are different.

[0074] In this embodiment, the filler includes the following raw materials: 10 g of silicon carbide fine powder, 65 g of silicon carbide coarse powder, 0.5 g of silane coupling agent KH550, 115 g of sodium polystyrene sulfonate, 130 g of modified nano-silica, and 10 g of silver nitrate.

[0075] In this embodiment, the particle size of the silicon carbide fine powder is 5 μm, and the particle size of the silicon carbide coarse powder is 106 μm.

[0076] Example 13: The difference from Example 1 is that when preparing the filler, the particle sizes of the silicon carbide fine powder and the particle sizes of the silicon carbide coarse powder are different.

[0077] In this embodiment, the filler includes the following raw materials: 10 g of silicon carbide fine powder, 65 g of silicon carbide coarse powder, 0.5 g of silane coupling agent KH550, 115 g of sodium polystyrene sulfonate, 130 g of modified nano-silica, and 10 g of silver nitrate.

[0078] The particle size of the silicon carbide fine powder is 5 μm, and the particle size of the silicon carbide coarse powder is 180 μm.

[0079] Comparative Example 1: The difference from Example 1 is that no filler is added.

[0080] Comparative Example 2: The difference from Example 1 is that the added amount of filler is 9 g.

[0081] Comparative Example 3: The difference from Example 1 is that the added amount of filler is 21 g.

[0082] Comparative Example 4: The difference from Example 1 is that the raw materials of the filler are different; The filler in this comparative example includes the following raw materials: 10 g of the first portion of silicon carbide coarse powder, 65 g of the second portion of silicon carbide coarse powder, 0.5 g of silane coupling agent KH550, 115 g of sodium polystyrene sulfonate, 130 g of modified nano-silica, and 10 g of silver nitrate.

[0083] The particle size of the silicon carbide coarse powder is 150 μm.

[0084] Comparative Example 5: The difference from Example 1 is that the raw materials of the filler are different; The filler in this comparative example includes the following raw materials: 10 g of the first portion of silicon carbide fine powder, 65 g of the second portion of silicon carbide fine powder, 0.5 g of silane coupling agent KH550, 115 g of sodium polystyrene sulfonate, 130 g of modified nano-silica, and 10 g of silver nitrate.

[0085] The particle size of the silicon carbide fine powder is 5 μm.

[0086] Comparative Example 6: The difference from Example 1 is that when preparing the filler, the particle sizes of the silicon carbide fine powder and the particle sizes of the silicon carbide coarse powder are different.

[0087] The filler in this comparative example includes the following raw materials: 10 g of silicon carbide fine powder, 65 g of silicon carbide coarse powder, 0.5 g of silane coupling agent KH550, 115 g of sodium polystyrene sulfonate, 130 g of modified nano-silica, and 10 g of silver nitrate.

[0088] The particle size of the silicon carbide fine powder is 1.3 μm, and the particle size of the silicon carbide coarse powder is 150 μm.

[0089] Comparative Example 7: The difference from Example 1 is that when preparing the filler, the particle sizes of the silicon carbide fine powder and the particle sizes of the silicon carbide coarse powder are different.

[0090] The filler in this comparative example includes the following raw materials: 10 g of silicon carbide fine powder, 65 g of silicon carbide coarse powder, 0.5 g of silane coupling agent KH550, 115 g of sodium polystyrene sulfonate, 130 g of modified nano-silica, and 10 g of silver nitrate.

[0091] The particle size of the silicon carbide fine powder is 6.5 μm, and the particle size of the silicon carbide coarse powder is 150 μm.

[0092] Comparative Example 8: The difference from Example 1 is that when preparing the filler, the particle sizes of the silicon carbide fine powder and the particle sizes of the silicon carbide coarse powder are different.

[0093] The filler in this comparative example includes the following raw materials: 10 g of silicon carbide fine powder, 65 g of silicon carbide coarse powder, 0.5 g of silane coupling agent KH550, 115 g of sodium polystyrene sulfonate, 130 g of modified nano-silica, and 10 g of silver nitrate.

[0094] The particle size of the silicon carbide fine powder is 5 μm, and the particle size of the silicon carbide coarse powder is 80 μm.

[0095] Comparative Example 9: The difference from Example 1 is that when preparing the filler, the particle sizes of the silicon carbide fine powder and the particle sizes of the silicon carbide coarse powder are different.

[0096] The filler in this comparative example includes the following raw materials: 10 g of silicon carbide fine powder, 65 g of silicon carbide coarse powder, 0.5 g of silane coupling agent KH550, 115 g of sodium polystyrene sulfonate, 130 g of modified nano-silica, and 10 g of silver nitrate.

[0097] The particle size of the silicon carbide fine powder is 5 μm, and the particle size of the silicon carbide coarse powder is 250 μm.

[0098] Performance testing: 1. Take 10 groups of steel plates with a size of 120 mm × 50 mm and remove the rust on the surface with 1200 grit sandpaper. Then, ultrasonically clean the steel plates with anhydrous ethanol and dry them with a hair dryer for later use. Place the treated steel plates on a test bench and use a 100 μm wire rod coater to apply the coatings prepared in the above embodiment and the comparative example on each group of steel plates. The wet film thickness is 100 μm. After coating, place the sample flat on the test bench and dry it at 125°C for 10 hours to obtain a coating sample. The performance of the prepared coating sample is tested: Adhesion test: refer to GB / T9286-2021 "Paints and varnishes - Cross-cut test" test standard; Determination of adhesion after oil immersion: refer to the test standard GB / T9286-2021 "Paints and varnishes - Cross-cut test"; Determination of corrosion resistance: refer to the test standard GB / T10125-2021 "Artificial atmosphere corrosion test-Salt spray test"; Determination of hardness: refer to GB / T6739-2006 "Paints and varnishes - Determination of film hardness by pencil method"; Determination of wear resistance: refer to the test standard of ASTM-D4060-19 "Standard Test Method for Abrasion Resistance of Organic Coatings Using Taber Abrasion Tester"; Impact resistance test: refer to GB / T20624.2-2006 "Paints and varnishes - Rapid impact (impact resistance) test, Part 2: Drop weight test (small area punch)" test standard; 2. High temperature resistance test: Test method: The coatings prepared in the above examples and comparative examples were applied to a steel plate with a uniform surface structure and a thickness of 3 mm in a uniform thickness, left to stand for 48 hours, and kept warm at 80°C for 2 hours to obtain a test sample; the sample surface was wiped to ensure that the sample surface was completely clean; the sample was placed in a high-temperature electric furnace for 2 hours, and the surface state of the sample was recorded at 700-800°C.

[0099] Table 1 Performance test results As can be seen from Table 1, the inorganic acid-resistant and wear-resistant coating prepared by the method of the present application has good adhesion, corrosion resistance, hardness, wear resistance, impact resistance and high temperature resistance, that is, the product coated with the coating of the present application has better wear resistance, corrosion resistance, high temperature resistance and mechanical properties.

[0100] Combining the test results of Example 1 and Comparative Example 1, it can be seen that the adhesion, corrosion resistance, hardness, wear resistance, impact resistance and high temperature resistance of Example 1 are all better than those of Comparative Example 1, indicating that the addition of fillers further improves the wear resistance, corrosion resistance, high temperature resistance and mechanical properties of the coating.

[0101] Combined with the test results of Example 1, Example 8, Example 9, Comparative Example 2 and Comparative Example 3, it can be seen that the amount of filler added has an impact on the performance of the coating, and when the amount of filler added is 10-20g, the adhesion, corrosion resistance, hardness, wear resistance, impact resistance and high temperature resistance of the coating are the best.

[0102] Combined with the test results of Example 1, Comparative Example 4 and Comparative Example 5, it can be seen that when preparing the filler, the particle size of the silicon carbide powder has an impact on the performance of the filler, and when silicon carbide fine powder and silicon carbide coarse powder are selected for blending, the adhesion, corrosion resistance, hardness, wear resistance, impact resistance and high temperature resistance of the filler are the best, indicating that the surface properties of the silicon carbide fine powder are regulated by surface modification, the interfacial interaction between the silicon carbide fine powder and the silicon carbide coarse powder is enhanced, and the filling effect of the silicon carbide fine powder is utilized to optimize the microstructure of the mixed system, thereby further improving the wear resistance, corrosion resistance, high temperature resistance and mechanical properties of the coating.

[0103] Combined with the test results of Example 10, Example 11, Example 12, Example 13, Comparative Example 6, Comparative Example 7, Comparative Example 8, and Comparative Example 9, it can be seen that when preparing fillers, the particle size of silicon carbide fine powder and the particle size of silicon carbide coarse powder have an impact on the performance of the coating, and when the particle size of silicon carbide fine powder is 2-6μm and the particle size of silicon carbide coarse powder is 106-180μm, the adhesion, corrosion resistance, hardness, wear resistance, impact resistance and high temperature resistance of the coating are best.

Claims

1. An inorganic acid-proof and wear-resistant coating, characterized by: The invention comprises the following raw materials in parts by weight: 10-30 parts of binder, 40-60 parts of corundum powder, 15-40 parts of silicon carbide, 2-8 parts of alumina micropowder, 2-8 parts of nano silicon dioxide, 1-10 parts of Guangxi soil, 0.1-2 parts of sodium fluorosilicate and 1-40 parts of water.

2. The inorganic acid-proof and wear-resistant coating according to claim 1, characterized in that: The inorganic acid-proof and wear-resistant coating comprises the following raw materials in parts by mass: 10-25 parts of binder, 45-55 parts of corundum powder, 20-35 parts of silicon carbide, 3-5 parts of aluminum oxide powder, 3-5 parts of nano-silicon dioxide, 4-7 parts of Guangxi soil, 0.5-1.5 parts of sodium fluorosilicate and 5-30 parts of water.

3. The inorganic acid-proof and wear-resistant coating according to claim 2, characterized in that: The binder is liquid water glass or solid water glass.

4. An inorganic acid-proof and wear-resistant coating according to any one of claims 1 to 3, characterized in that: The inorganic acid-proof and wear-resistant coating further comprises 10-20 parts of filler.

5. The inorganic acid-proof and wear-resistant coating according to claim 4, characterized in that: The filler comprises the following raw materials in parts by mass: 8-12 parts of silicon carbide fine powder, 50-80 parts of silicon carbide coarse powder, 0.2-0.8 parts of silane coupling agent, 100-130 parts of sodium polystyrene sulfonate, 100-150 parts of modified nano-silicon dioxide and 5-15 parts of silver nitrate.

6. The inorganic acid-proof and wear-resistant coating according to claim 5, characterized in that: The particle size of the silicon carbide fine powder is 2-6 μm, and the particle size of the silicon carbide coarse powder is 106-180 μm.

7. The inorganic acid-proof and wear-resistant coating according to claim 5, characterized in that: The modified nano-silica comprises the following raw materials in parts by mass: 60-120 parts of ethanol, 2-6 parts of ammonia water, 0.4-0.8 parts of ethylenediamine, 0.5-2 parts of 3-aminophenol, 1-3 parts of formaldehyde, 3-7 parts of ethyl orthosilicate, 60-100 parts of toluene, 0.1-1 parts of 3-aminopropyltriethoxysilane and 30-50 parts of nano-silica.

8. The inorganic acid-proof and wear-resistant coating according to claim 7, characterized in that: The preparation method of the modified nano-silica comprises the following steps: Ethanol, ammonia water and ethylenediamine are mixed, 3-aminophenol, formaldehyde and ethyl orthosilicate are added and mixed, nano-silica is added and mixed, centrifuged and dried, toluene is added and mixed, and 3-aminopropyltriethoxysilane is added and mixed to obtain modified nano-silica.

9. The inorganic acid-proof and wear-resistant coating according to claim 5, characterized in that: The preparation method of the filler comprises the following steps: Mixing silicon carbide fine powder and a silane coupling agent, adding sodium polystyrene sulfonate and mixing, and then adding silicon carbide coarse powder and mixing to obtain a first mixture; Mixing the modified nano-silica with silver nitrate to obtain a second mixture; The first mixture and the second mixture are mixed and then dried to obtain a filler.

10. A method for preparing an inorganic acid-proof and wear-resistant coating, characterized in that: The preparation method comprises the following steps: Weigh each raw material according to the formula; The binder, corundum powder, silicon carbide, aluminum oxide powder, nano silicon dioxide, Guangxi soil, sodium fluorosilicate, water and filler are mixed to obtain an inorganic acid-proof and wear-resistant coating.

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