Cement concrete surface coating structure with acid-resistant and corrosion-resistant functions

Abstract

The invention belongs to the technical field of cement concrete surface coatings, and discloses a cement concrete surface coating structure with acid-resistant and corrosion-resistant functions, which has the advantages that the acid resistance is improved: a composite coating structure is adopted, and the advantages of modified epoxy resin, nano filler and polyurea are combined, so that the acid resistance and durability of the coating are remarkably improved. The modified epoxy resin primer has good permeability, so that the adhesive force between the coating and a concrete base layer can be effectively enhanced, and the falling risk is reduced. And compared with a traditional epoxy resin coating, the preparation method of the composite coating simplifies the curing process and reduces the construction difficulty. And the cost is reduced: the nanofiller is adopted to replace part of the polyurea material, so that the cost of the coating is reduced, and the performance is improved. The coating is endowed with excellent hydrophobicity and self-cleaning capability through surface hydrophobic treatment, dirt adhesion is reduced, and the service life is prolonged.

Description

Technical Field

[0001] The invention belongs to the technical field of cement concrete surface coatings, and in particular relates to a cement concrete surface coating structure with acid-resistant and anti-corrosion functions. Background Art

[0002] Epoxy resin coatings have excellent chemical resistance, abrasion resistance and adhesion, and are often used to protect concrete from acid and alkali corrosion. The curing process of epoxy resin coatings is complicated and requires strict control of temperature and humidity. In a long-term acidic environment, the coating is prone to aging, cracking and falling off. The poor air permeability of the coating itself causes moisture accumulation inside the concrete, affecting the durability of the structure.

[0003] Polyurea coating has the characteristics of fast curing, high strength, wear resistance, etc., and has a certain resistance to acid and alkali corrosion. Polyurea coating has high requirements for base treatment and is difficult to construct. The high cost limits its wide application. Under extreme temperature conditions, the coating performance decreases.

[0004] Through the above analysis, the problems and defects of the prior art are as follows:

[0005] (1) The curing process of epoxy resin coating is complicated and requires strict control of temperature and humidity. In a long-term acidic environment, the coating is prone to aging, cracking and falling off. The poor air permeability of the coating itself causes moisture accumulation inside the concrete, affecting the durability of the structure.

[0006] (2) Polyurea coatings have high requirements for base treatment and are difficult to construct. The high cost limits their widespread application. The coating performance deteriorates under extreme temperature conditions. Summary of the invention

[0007] In view of the problems existing in the prior art, the present invention provides a cement concrete surface coating structure with acid-resistant and anti-corrosion functions.

[0008] The present invention is achieved in that a method for preparing a cement concrete surface coating structure having acid-resistant and anti-corrosion functions comprises:

[0009] Step 1, base layer processing:

[0010] Clean the concrete surface, remove oil, dust and impurities, and ensure it is dry and flat;

[0011] Step 2, Primer Application:

[0012] Apply the modified epoxy resin primer evenly on the concrete surface to penetrate and seal the pores of the base layer;

[0013] Step 3, nanofiller filling:

[0014] Before the primer is completely cured, spray or roll on the nano-silicon dioxide dispersion to fill the micropores in the primer;

[0015] Step 4, topcoat application:

[0016] After the base layer is dry, the polyurea topcoat is applied by spraying to form a continuous and uniform protective layer;

[0017] Step 5, surface treatment:

[0018] After the topcoat is cured, use fluorosilane or other hydrophobic agents for surface treatment.

[0019] Further, the base layer is processed:

[0020] 1) Use a high-pressure water gun to thoroughly clean the concrete surface to remove oil, dust, and loose particles;

[0021] 2) For uneven or cracked surfaces, use an angle grinder or wire brush to grind them to ensure a smooth surface;

[0022] 3) After the surface is dry, check for leaks or seepage. If found, repair them.

[0023] Further, the primer is applied:

[0024] (1) Mix the primer and diluent in proportion according to the primer product instructions;

[0025] (2) Use a roller, sprayer or brush to evenly apply the primer to the concrete surface, ensuring that the coating thickness meets the requirements; apply evenly.

[0026] Further, the nanofiller is filled with:

[0027] Before the primer is completely cured, use a sprayer or roller to evenly spray or roll the nano-silicon dioxide dispersion onto the primer surface;

[0028] Control the spraying or rolling speed to ensure uniform distribution of nanofillers;

[0029] After the nanofiller is dried, it can be coated multiple times as needed.

[0030] Further, the topcoat is applied:

[0031] After the base layer is dry, use a sprayer to evenly spray the polyurea topcoat on the base layer surface;

[0032] Control the spraying distance and angle to ensure uniform coating thickness;

[0033] Apply multiple coats as needed until the designed thickness is reached.

[0034] Furthermore, the surface treatment:

[0035] After the topcoat is completely cured, use a sprayer or brush to evenly apply the hydrophobic agent to the topcoat surface;

[0036] Control coating amount;

[0037] After the hydrophobic agent dries, the coating can be put into use.

[0038] The present invention also provides a cement concrete surface coating structure with acid-resistant and anti-corrosion functions, the coating structure comprising:

[0039] The base treatment layer is used to clean the concrete surface, remove oil, dust and impurities, and ensure it is dry and flat;

[0040] A primer layer, applied on the base treatment layer, is composed of a modified epoxy resin primer and is used to penetrate and seal the pores of the base;

[0041] A nanofiller layer is filled in the micropores in the primer layer and is formed by a nano-silicon dioxide dispersion;

[0042] A topcoat layer, applied on the nanofiller layer, is composed of a polyurea topcoat to form a continuous and uniform protective layer;

[0043] The surface treatment layer is arranged on the topcoat layer and is composed of fluorosilane or other hydrophobic agents to improve the hydrophobic properties of the coating surface.

[0044] Furthermore, the primer layer uniformly penetrates and seals the pores of the base layer during the coating process to improve the adhesion and corrosion resistance of the coating.

[0045] Furthermore, the nano-filler layer is formed by spraying or rolling the nano-silicon dioxide dispersion before the primer layer is completely cured, and is used to fill the micropores in the primer layer, thereby further improving the compactness and corrosion resistance of the coating.

[0046] In combination with the above technical solutions and the technical problems solved, the advantages and positive effects of the technical solutions to be protected by the present invention are as follows:

[0047] First, improve acid resistance: adopt a composite coating structure, combining the advantages of modified epoxy resin, nanofiller and polyurea to significantly improve the acid resistance and durability of the coating.

[0048] Enhanced adhesion: The modified epoxy resin primer has good permeability, which can effectively enhance the adhesion between the coating and the concrete base and reduce the risk of falling off.

[0049] Simplified construction process: Compared with traditional epoxy resin coating, this composite coating preparation method simplifies the curing process and reduces the difficulty of construction.

[0050] Reduce costs: Using nanofillers to replace part of the polyurea material reduces coating costs while improving performance.

[0051] Improve self-cleaning ability: Surface hydrophobic treatment gives the coating excellent water repellency and self-cleaning ability, reduces dirt adhesion and extends service life.

[0052] Expected results:

[0053] This improved solution is expected to solve the problems existing in the existing technology, such as poor adhesion, insufficient acid resistance, complex construction, and high cost, and provide an acid-resistant and anti-corrosion concrete surface coating solution with excellent performance, simple construction, economy and environmental protection.

[0054] The new composite coating structure provides excellent protection and decoration effects for modern buildings by combining advanced materials such as modified epoxy resin primer, nano filler and polyurea topcoat. The modified epoxy resin primer has been specially modified to have better permeability and adhesion. It can penetrate into the tiny pores of the concrete base and form a strong chemical bond with the concrete, thus providing a stable base coating and enhancing the bonding strength between the coating and the base, providing preliminary anti-corrosion protection for the entire coating system and resisting the invasion of harmful substances such as external moisture and chloride ions.

[0055] Introducing nano-silica or other nano-fillers into the primer layer can effectively fill the micro-pores in the primer layer and improve the density of the coating. Nano-fillers not only significantly improve the acid resistance, alkali resistance, and salt spray resistance of the coating, but also enhance the hardness and wear resistance of the coating, ensuring that the coating can maintain its excellent performance in various harsh environments.

[0056] The polyurea topcoat used in the surface layer is known for its fast curing and high strength. After application, it can quickly form a tough, wear-resistant, weather-resistant protective layer that effectively resists erosion from the external environment. At the same time, the polyurea topcoat also has good decorative properties, which can enhance the aesthetics of the protected object. The surface treatment by applying fluorosilane or other hydrophobic agents significantly improves the hydrophobicity of the coating, allowing the coating to repel water and dirt more effectively, thereby enhancing its self-cleaning ability and corrosion resistance, providing long-term protection and reducing maintenance costs.

[0057] In summary, the new composite coating structure not only solves the technical problems in the existing technology, but also makes significant technical progress in anti-corrosion, waterproofing and durability. Through sophisticated preparation technology, the coating structure provides a reliable solution for modern building protection and repair, significantly extending the service life of the building and improving the aesthetics of the building.

[0058] Second, the present invention relates to a cement concrete surface coating structure with acid-resistant and anti-corrosion functions, which solves the problem of insufficient acid-resistant and anti-corrosion performance in the prior art through the design of a multi-layer coating. The existing cement concrete surface coating is prone to corrosion in an acidic environment for a long time, resulting in coating peeling and structural damage. In order to overcome this problem, the present invention effectively improves the acid-resistant and anti-corrosion performance of the coating by arranging a multi-layer coating on the concrete surface, including a base treatment layer, a primer layer, a nanofiller layer, a topcoat layer and a surface treatment layer.

[0059] First, the present invention cleans and treats the concrete surface through the base treatment layer to remove oil, dust and impurities, ensure that the surface is dry and flat, and thus provide a good foundation for the subsequent adhesion of the coating. The primer layer is composed of a modified epoxy resin primer, which can penetrate and seal the pores of the base layer, thereby improving the adhesion and corrosion resistance of the coating. This layer evenly penetrates the base layer during the coating process, ensuring the stability and durability of the coating.

[0060] Secondly, the present invention introduces a nanofiller layer into the primer layer, and uses nano-silicon dioxide dispersion to fill the micropores in the primer layer, thereby further improving the compactness and corrosion resistance of the coating. This design not only fills the defects of the primer layer, but also enhances the mechanical strength and chemical corrosion resistance of the coating through the characteristics of nanomaterials. The nanofiller layer is sprayed or rolled before the primer layer is completely cured, ensuring good bonding between the two layers.

[0061] Finally, the present invention applies a layer of polyurea topcoat on the nanofiller layer to form a continuous and uniform protective layer, which has excellent wear resistance and UV resistance and can maintain long-term stability in harsh environments. At the same time, the surface treatment layer is composed of fluorosilane or other hydrophobic agents, which further improves the hydrophobicity of the coating surface and reduces the intrusion of moisture and acidic substances, thereby significantly extending the service life of the coating. The multi-layer coating structure of the present invention achieves excellent acid and corrosion resistance through reasonable material selection and interlayer matching, solves the shortcomings of the prior art, and significantly improves the durability and safety of cement concrete structures. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] Figure 1 It is a flow chart of a method for preparing a cement concrete surface coating structure with acid-resistant and anti-corrosion functions provided by an embodiment of the present invention.

[0063] Figure 2 It is a flow chart of the base layer processing method provided by an embodiment of the present invention.

[0064] Figure 3 It is a flow chart of the primer coating method provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0065] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0066] The following are two specific embodiments, including the application of power plant equipment and involving the ratio of materials:

[0067] ###Example 1: Acid-resistant and anticorrosive cement concrete surface coating structure for power plant chimney

[0068] 1. Basic processing layer:

[0069] First, clean the inner wall of the power plant chimney to remove all oil, dust and other impurities, and ensure that the surface is dry and flat. Use a high-pressure water gun and industrial cleaner to clean it thoroughly.

[0070] After cleaning, wait for the surface to dry completely.

[0071] 2. Primer layer:

[0072] Formula: 100 parts of modified epoxy resin primer, 10 parts of curing agent, and 5 parts of diluent.

[0073] Apply the primer evenly over the base treatment, ensuring that the primer penetrates and seals the pores of the base. Apply with a brush or roller, ensuring even distribution.

[0074] The primer layer is applied with a thickness of 0.2-0.3 mm.

[0075] 3. Nano filler layer:

[0076] Formula: 50 parts of nano-silicon dioxide dispersion, 50 parts of deionized water.

[0077] Before the primer layer is completely cured, the nano-silicon dioxide dispersion is evenly coated on the primer layer by spraying or rolling. The nano-filler layer will fill the micropores in the primer layer.

[0078] The layer is applied at a thickness of 0.1-0.2 mm.

[0079] 4. Topcoat layer:

[0080] Formula: 100 parts of polyurea topcoat, 15 parts of curing agent, and 10 parts of diluent.

[0081] After the nanofiller layer is cured, the polyurea topcoat is evenly applied on it to form a continuous and uniform protective layer. The coating is carried out by spraying or rolling.

[0082] The coating thickness of the topcoat layer is 0.3-0.5 mm.

[0083] 5. Surface treatment layer:

[0084] Formula: 100 parts of fluorosilane, 20 parts of diluent.

[0085] After the topcoat layer is cured, fluorosilane or other hydrophobic agents are evenly applied on the topcoat layer to improve the hydrophobic properties of the coating surface. The coating is carried out by spraying or brushing.

[0086] The coating thickness of the surface treatment layer is 0.05-0.1 mm.

[0087] ###Example 2: Acid-resistant and anticorrosive cement concrete surface coating structure for cooling tower equipment in power plants

[0088] 1. Basic processing layer:

[0089] Clean the concrete structure surface of the power plant cooling tower to remove all oil, dust and other impurities and ensure that the surface is dry and flat. Use high-pressure water guns and industrial cleaners for thorough cleaning.

[0090] After cleaning, wait for the surface to dry completely.

[0091] 2. Primer layer:

[0092] Formula: 80 parts of modified epoxy resin primer, 8 parts of curing agent, and 4 parts of diluent.

[0093] Apply the primer evenly over the base treatment, ensuring that the primer penetrates and seals the pores of the base. Apply with a brush or roller, ensuring even distribution.

[0094] The primer layer is applied with a thickness of 0.2-0.3 mm.

[0095] 3. Nano filler layer:

[0096] Formula: 40 parts of nano-silicon dioxide dispersion, 60 parts of deionized water.

[0097] Before the primer layer is completely cured, the nano-silicon dioxide dispersion is evenly coated on the primer layer by spraying or rolling. The nano-filler layer will fill the micropores in the primer layer.

[0098] The layer is applied at a thickness of 0.1-0.2 mm.

[0099] 4. Topcoat layer:

[0100] Formula: 90 parts of polyurea topcoat, 13.5 parts of curing agent, and 9 parts of diluent.

[0101] After the nanofiller layer is cured, the polyurea topcoat is evenly applied on it to form a continuous and uniform protective layer. The coating is carried out by spraying or rolling.

[0102] The coating thickness of the topcoat layer is 0.3-0.5 mm.

[0103] 5. Surface treatment layer:

[0104] Formula: 80 parts of fluorosilane, 16 parts of diluent.

[0105] After the topcoat layer is cured, fluorosilane or other hydrophobic agents are evenly applied on the topcoat layer to improve the hydrophobic properties of the coating surface. The coating is carried out by spraying or brushing.

[0106] The coating thickness of the surface treatment layer is 0.05-0.1 mm.

[0107] The two embodiments specifically describe the application of cement concrete surface coating structures with acid-resistant and anti-corrosion functions in power plant chimneys and cooling tower equipment, and list in detail the formulas of each layer of materials and their coating methods, ensuring the effectiveness and durability of the coating structure.

[0108] The following are four specific embodiments of the cement concrete surface coating structure with acid-resistant and anti-corrosion functions:

[0109] Embodiment 1:

[0110] Acid-resistant anticorrosion coating is applied to the surface of cement concrete tanks in a chemical plant. First, use a high-pressure water gun to clean the surface of the tank to remove oil and dust. Then, use a brush to evenly apply the modified epoxy resin primer to the surface of the tank. When the primer is slightly dry but not completely cured, use a spray gun to spray the nano-silica dispersion to fill the micropores in the primer. After the base layer is completely dry, use a sprayer to spray the polyurea topcoat to form a continuous protective layer. Finally, use a roller coating method to evenly apply the fluorosilane solution to the surface of the topcoat to improve the hydrophobicity of the coating.

[0111] Embodiment 2:

[0112] Acid-resistant anticorrosion coatings are applied to concrete bridge piers in marine environments. First, the surface of the bridge pier is polished to remove loose concrete and impurities. Then, a modified epoxy resin primer is sprayed on the surface of the bridge pier using an airless sprayer to ensure that the primer penetrates evenly and seals the pores of the base layer. Before the primer is fully cured, a nano-silica dispersion is evenly applied to the surface of the primer using a brush to fill the micropores. After the base layer is dry, a polyurea topcoat is sprayed again using an airless sprayer to form a dense protective layer. Finally, a fluorosilane solution is evenly sprayed on the surface of the topcoat using a sprayer to enhance the water resistance and corrosion resistance of the coating.

[0113] Embodiment 3:

[0114] Acid-resistant anticorrosion coating is applied to the inner wall of cement concrete in acidic wastewater treatment tanks. First, use chemical cleaning agents to clean the inner wall surface to remove oil and acid residues. Then, use roller coating to evenly roll the modified epoxy resin primer on the inner wall surface to seal the pores of the base layer. Before the primer is completely dry, use a spray gun to spray nano-silica dispersion to fill the micropores in the primer. After the base layer is completely cured, use high-pressure spraying equipment to spray polyurea topcoat to form a uniform and dense protective layer. Finally, use dip coating to completely immerse the inner wall in fluorosilane solution, take it out and dry it to enhance the acid resistance and corrosion resistance of the coating.

[0115] Embodiment 4:

[0116] Acid-resistant anticorrosive coatings are applied to the surface of cement concrete pipes in petrochemical plants. First, the pipe surface is sandblasted to remove rust and old coatings. Then, the modified epoxy resin primer is evenly brushed on the pipe surface by brushing to ensure that the primer fully penetrates and seals the pores of the base layer. When the primer is slightly dry but not completely cured, a nano-silica dispersion is sprayed with a spray gun to fill the micropores in the primer. After the base layer is completely dry, the polyurea topcoat is evenly sprayed on the pipe surface by spraying to form a continuous and dense protective layer. Finally, the fluorosilane solution is evenly rolled on the topcoat surface by rolling to improve the hydrophobicity and chemical resistance of the coating.

[0117] like Figure 1 As shown, a method for preparing a cement concrete surface coating structure with acid-resistant and anti-corrosion functions provided by an embodiment of the present invention comprises the following steps:

[0118] S101, base treatment:

[0119] Clean the concrete surface, remove oil, dust and impurities, and ensure it is dry and flat;

[0120] S102, Primer Application:

[0121] Apply the modified epoxy resin primer evenly on the concrete surface to penetrate and seal the pores of the base layer;

[0122] S103, nanofiller filling:

[0123] Before the primer is completely cured, spray or roll on the nano-silicon dioxide dispersion to fill the micropores in the primer;

[0124] S104, topcoat application:

[0125] After the base layer is dry, the polyurea topcoat is applied by spraying to form a continuous and uniform protective layer;

[0126] S105, surface treatment:

[0127] After the topcoat is cured, use fluorosilane or other hydrophobic agents for surface treatment.

[0128] like Figure 2 As shown, the base layer processing provided by the embodiment of the present invention is:

[0129] S201, use a high-pressure water gun to thoroughly clean the concrete surface to remove oil, dust, and loose particles;

[0130] S202, for uneven or cracked surfaces, use an angle grinder or wire brush to grind them to ensure a smooth surface;

[0131] S203, after the surface is dry, check for water leaks or seepage, if any, repair them.

[0132] like Figure 3 As shown, the primer coating provided by the embodiment of the present invention is:

[0133] S301, according to the primer product manual, mix the primer and the thinner in proportion;

[0134] S302, use a roller, sprayer or brush to evenly apply the primer to the concrete surface, ensuring that the coating thickness meets the requirements; apply evenly.

[0135] The nanofiller provided in the embodiment of the present invention is filled with:

[0136] Before the primer is completely cured, use a sprayer or roller to evenly spray or roll the nano-silicon dioxide dispersion onto the primer surface;

[0137] Control the spraying or rolling speed to ensure uniform distribution of nanofillers;

[0138] After the nanofiller is dried, it can be coated multiple times as needed.

[0139] The topcoat coating provided by the embodiment of the present invention:

[0140] After the base layer is dry, use a sprayer to evenly spray the polyurea topcoat on the base layer surface;

[0141] Control the spraying distance and angle to ensure uniform coating thickness;

[0142] Apply multiple coats as needed until the designed thickness is reached.

[0143] Surface treatment provided by the embodiment of the present invention:

[0144] After the topcoat is completely cured, use a sprayer or brush to evenly apply the hydrophobic agent to the topcoat surface;

[0145] Control coating amount;

[0146] After the hydrophobic agent dries, the coating can be put into use.

[0147] The present invention is specifically implemented:

[0148] Improved technical solutions:

[0149] New composite coating structure:

[0150] Base layer: Use modified epoxy resin primer to improve the permeability to the concrete base, enhance adhesion, and provide initial anti-corrosion protection.

[0151] Middle layer: Introduce nano-silica or other nano-fillers to fill the micropores in the primer, improve the density of the coating, and enhance the acid resistance.

[0152] Surface layer: Polyurea topcoat is used, taking advantage of its fast curing and high strength characteristics to form a tough, wear-resistant and weather-resistant protective layer.

[0153] Surface treatment: After the surface layer is cured, the surface is hydrophobic treated to improve the hydrophobicity and self-cleaning ability of the coating and further enhance the acid and corrosion resistance.

[0154] Preparation method:

[0155] Base treatment: Clean the concrete surface, remove oil, dust and other impurities, and ensure it is dry and flat.

[0156] Primer coating: Apply the modified epoxy resin primer evenly on the concrete surface to penetrate and seal the pores of the base layer.

[0157] Nano-filler filling: Before the primer is completely cured, spray or roll on the nano-silica dispersion to fill the micro-pores in the primer.

[0158] Topcoat application: After the base layer is dry, apply the polyurea topcoat by spraying to form a continuous and uniform protective layer.

[0159] Surface treatment: After the topcoat is cured, use fluorosilane or other hydrophobic agents for surface treatment to improve the hydrophobicity of the coating.

[0160] The following is a specific implementation scheme of the structure and preparation method of cement concrete surface coating with acid-resistant and anti-corrosion functions:

[0161] Materials preparation:

[0162] Modified epoxy resin primer: Choose an epoxy resin primer with good permeability, adhesion and acid resistance, such as water-based epoxy primer or solvent-based epoxy primer, and add toughening agents, preservatives and other additives as needed.

[0163] Nano-silicon dioxide dispersion: Choose a nano-silicon dioxide dispersion with uniform particle size and good dispersibility, the concentration is generally 10-30%.

[0164] Polyurea topcoat: Choose a polyurea topcoat with high strength, wear resistance and good weather resistance, such as pure polyurea or semi-polyurea, and adjust the curing speed as needed.

[0165] Hydrophobic agent: Choose a hydrophobic agent with good water repellency and durability, such as fluorosilane, siloxane or silicone resin.

[0166] Other materials: thinner, cleaning agent, protective equipment, etc.

[0167] Equipment preparation:

[0168] Base layer processing equipment: high-pressure water gun, angle grinder, wire brush, etc.

[0169] Coating equipment: roller, sprayer, brush, etc.

[0170] Drying equipment: heater, fan, etc.

[0171] Specific implementation steps:

[0172] Base treatment:

[0173] Use a high-pressure water gun to thoroughly clean the concrete surface to remove impurities such as oil, dust, loose particles, etc.

[0174] For uneven or cracked surfaces, use an angle grinder or wire brush to smooth out the surface.

[0175] After the surface is dry, check for leaks or seepage, and if so, repair them.

[0176] Primer application:

[0177] According to the primer product instructions, mix the primer and thinner in proportion and evenly.

[0178] Use a roller, sprayer or brush to evenly apply the primer to the concrete surface, ensuring that the coating thickness meets the requirements.

[0179] Pay attention to apply evenly to avoid missing or accumulation.

[0180] Nanofiller filling:

[0181] Before the primer is completely cured (usually 2-4 hours), use a sprayer or roller to evenly spray or roll the nano-silicon dioxide dispersion onto the primer surface.

[0182] Control the spraying or rolling speed to ensure uniform distribution of nanofillers and avoid local accumulation.

[0183] After the nanofiller is dried, it can be coated multiple times as needed to improve the density of the coating.

[0184] Topcoat application:

[0185] After the base layer is dry (usually 24 hours), use a sprayer to evenly spray the polyurea topcoat on the base layer surface.

[0186] Control the spraying distance and angle to ensure uniform coating thickness and avoid defects such as bubbles and sagging.

[0187] Apply multiple coats as needed until the designed thickness is reached.

[0188] Surface treatment:

[0189] After the topcoat is completely cured (usually 48 hours), use a sprayer or brush to evenly apply the hydrophobic agent to the topcoat surface.

[0190] Control the coating amount to avoid too much or too little hydrophobic agent.

[0191] After the hydrophobic agent dries, the coating can be put into use.

[0192] Note:

[0193] During the construction process, attention should be paid to safety, protective equipment should be worn, and contact with skin and eyes should be avoided.

[0194] The construction environment should be well ventilated and free from fire sources.

[0195] Strictly follow the product instructions to control coating thickness and drying time.

[0196] Check the coating condition regularly and repair damaged areas in time.

[0197] Through the above specific implementation method, a cement concrete surface coating with excellent acid and corrosion resistance can be prepared, which effectively prolongs the service life of the concrete structure and reduces maintenance costs.

[0198] The new composite coating structure and its preparation method are of great significance in the field of modern building protection and repair. The following will be combined with specific parameters and materials to explain this structure and its preparation process in detail.

[0199] First, the bottom layer: modified epoxy resin primer

[0200] Material characteristics: The modified epoxy resin primer has been specially modified to have better permeability and adhesion. It can penetrate into the tiny pores of the concrete base and form a strong chemical bond with the concrete, thus providing a stable base coating.

[0201] Anti-corrosion protection: This primer not only enhances the bonding strength between the coating and the base layer, but also provides preliminary anti-corrosion protection for the entire coating system. It can resist the intrusion of harmful substances such as external moisture and chloride ions, and extend the service life of the building.

[0202] Second, middle layer: nano-silica or other nano-fillers

[0203] Material selection and characteristics: Nano-silicon dioxide can effectively fill the micropores in the primer layer and improve the density of the coating due to its ultra-fine particle size and high specific surface area.

[0204] Performance improvement: By introducing nanofillers, the coating's acid resistance, alkali resistance, salt spray resistance and other properties are significantly improved. In addition, nanomaterials can also enhance the hardness and wear resistance of the coating.

[0205] Third, surface layer: polyurea topcoat

[0206] Fast curing and high strength: Polyurea topcoat is known for its fast curing and high strength. After coating, it can quickly form a tough, wear-resistant and weather-resistant protective layer to effectively resist the erosion of the external environment.

[0207] Both aesthetics and practicality are important: In addition to its excellent protective function, polyurea topcoat also has good decorative properties, which can enhance the aesthetics of the protected object.

[0208] Fourth, surface treatment: hydrophobic treatment

[0209] Hydrophobicity and self-cleaning ability: After the topcoat is cured, the hydrophobicity of the coating can be significantly improved by applying fluorosilane or other hydrophobic agents. This means that the coating can repel water and dirt more effectively, thereby enhancing its self-cleaning ability and corrosion resistance.

[0210] Long-term protection: After hydrophobic treatment, the coating can maintain good protection performance for a longer period of time, reducing maintenance costs.

[0211] Fifth, detailed explanation of preparation method

[0212] 1. Base treatment: Cleaning the concrete surface is a key step to ensure the quality of the coating. By removing impurities such as oil, dust, etc. and ensuring that the base is dry and flat, ideal conditions can be created for subsequent coating construction.

[0213] 2. Primer coating: Apply the modified epoxy resin primer evenly on the cleaned concrete surface. This step is crucial because it not only closes the pores of the base layer, but also provides a solid foundation for the entire coating system.

[0214] 3. Nano-filler filling: Before the primer layer is completely cured, spray or roll the nano-silicon dioxide dispersion in time. This ensures that the nano-filler can penetrate into the micro-pores of the primer and improve the overall performance of the coating.

[0215] 4. Topcoat application: After the base layer is completely dry, the polyurea topcoat is evenly applied using spraying technology. This step is the key to forming a tough, wear-resistant protective layer.

[0216] 5. Surface treatment: After the polyurea topcoat is cured, the coating surface is immediately treated with fluorosilane or other special hydrophobic agents. This not only improves the hydrophobicity of the coating, but also enhances its self-cleaning and corrosion resistance.

[0217] In summary, the new composite coating structure provides excellent protection and decorative effects for modern buildings by combining advanced materials such as modified epoxy resin primer, nanofiller and polyurea topcoat, as well as sophisticated preparation technology.

[0218] Coating component scheme

[0219] 1. Primer layer components

[0220] 1. Modified epoxy resin: 60% (provides strong adhesion and anti-corrosion effect)

[0221] 2. Pigment: 20% (for color adjustment and enhanced covering power)

[0222] 3.Solvent: 15% (used to adjust the viscosity and drying speed of the coating)

[0223] 4. Additives: 5% (including leveling agent, defoamer, etc., used to improve the coating construction performance)

[0224] 2. Middle Layer Components

[0225] 1. Nano-silica filler: 40% (fills the micropores of the primer and improves the density of the coating)

[0226] 2. Epoxy resin: 30% (as a binder to enhance the bonding between nanofiller and primer and topcoat)

[0227] 3. Curing agent: 20% (to promote the curing of epoxy resin and improve the hardness of coating)

[0228] 4. Thinner: 10% (to adjust the viscosity of the paint for easy construction)

[0229] 3. Surface layer components

[0230] 1. Polyurea resin: 50% (fast curing, forming a tough, wear-resistant protective layer)

[0231] 2. Pigment: 25% (provides color and hiding power)

[0232] 3. Curing agent: 15% (to promote the curing of polyurea resin)

[0233] 4. Additives: 10% (including plasticizers, UV absorbers, etc., to improve the weather resistance and service life of the coating)

[0234] illustrate:

[0235] The above component ratios are for reference only, and the specific ratios should be adjusted according to actual needs and product performance.

[0236] The primer layer mainly provides adhesion and preliminary anti-corrosion protection; the middle layer enhances the density and acid resistance of the coating through nano-fillers; the surface layer forms a tough, wear-resistant protective layer and provides beautiful decorative effects.

[0237] During the preparation process, the components should be mixed strictly according to the ratio and stirred evenly to obtain the best coating performance.

[0238] Technological advancements:

[0239] Improve acid resistance: The composite coating structure combines the advantages of modified epoxy resin, nanofiller and polyurea to significantly improve the acid resistance and durability of the coating.

[0240] Enhanced adhesion: The modified epoxy resin primer has good permeability, which can effectively enhance the adhesion between the coating and the concrete base and reduce the risk of falling off.

[0241] Simplified construction process: Compared with traditional epoxy resin coating, this composite coating preparation method simplifies the curing process and reduces the difficulty of construction.

[0242] Reduce costs: Using nanofillers to replace part of the polyurea material reduces coating costs while improving performance.

[0243] Improve self-cleaning ability: Surface hydrophobic treatment gives the coating excellent water repellency and self-cleaning ability, reduces dirt adhesion and prolongs service life.

[0244] Expected results:

[0245] This improved solution is expected to solve the problems existing in the existing technology, such as poor adhesion, insufficient acid resistance, complex construction, and high cost, and provide an acid-resistant and anti-corrosion concrete surface coating solution with excellent performance, simple construction, economy and environmental protection.

[0246] The new composite coating structure provides excellent protection and decoration effects for modern buildings by combining advanced materials such as modified epoxy resin primer, nano filler and polyurea topcoat. The modified epoxy resin primer has been specially modified to have better permeability and adhesion. It can penetrate into the tiny pores of the concrete base and form a strong chemical bond with the concrete, thus providing a stable base coating and enhancing the bonding strength between the coating and the base, providing preliminary anti-corrosion protection for the entire coating system and resisting the invasion of harmful substances such as external moisture and chloride ions.

[0247] Introducing nano-silica or other nano-fillers into the primer layer can effectively fill the micro-pores in the primer layer and improve the density of the coating. Nano-fillers not only significantly improve the acid resistance, alkali resistance, and salt spray resistance of the coating, but also enhance the hardness and wear resistance of the coating, ensuring that the coating can maintain its excellent performance in various harsh environments.

[0248] The polyurea topcoat used in the surface layer is known for its fast curing and high strength. After application, it can quickly form a tough, wear-resistant, weather-resistant protective layer that effectively resists erosion from the external environment. At the same time, the polyurea topcoat also has good decorative properties, which can enhance the aesthetics of the protected object. The surface treatment by applying fluorosilane or other hydrophobic agents significantly improves the hydrophobicity of the coating, allowing the coating to repel water and dirt more effectively, thereby enhancing its self-cleaning ability and corrosion resistance, providing long-term protection and reducing maintenance costs.

[0249] In summary, the new composite coating structure not only solves the technical problems in the existing technology, but also makes significant technical progress in anti-corrosion, waterproofing and durability. Through sophisticated preparation technology, the coating structure provides a reliable solution for modern building protection and repair, significantly extending the service life of the building and improving the aesthetics of the building.

[0250] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any modifications, equivalent substitutions and improvements made by any technician familiar with the technical field within the technical scope disclosed by the present invention and within the spirit and principle of the present invention should be covered by the protection scope of the present invention.

Claims

1. A cement concrete surface coating structure with acid and corrosion resistance, characterized in that: The coating structure comprises: The base treatment layer is used to clean the concrete surface, remove oil, dust and impurities, and ensure it is dry and flat; A primer layer, applied on the base treatment layer, is composed of a modified epoxy resin primer and is used to penetrate and seal the pores of the base; A nanofiller layer is filled in the micropores in the primer layer and is formed by a nano-silicon dioxide dispersion; A topcoat layer, applied on the nanofiller layer, is composed of a polyurea topcoat to form a continuous and uniform protective layer; The surface treatment layer is arranged on the topcoat layer and is composed of fluorosilane or other hydrophobic agents to improve the hydrophobic properties of the coating surface.

2. The cement concrete surface coating structure with acid and corrosion resistance according to claim 1 is characterized in that: The primer layer uniformly penetrates and seals the pores of the base layer during the coating process to improve the adhesion and corrosion resistance of the coating.

3. The cement concrete surface coating structure with acid and corrosion resistance according to any one of claims 1 or 2, characterized in that: The nano filler layer is formed by spraying or rolling a nano silicon dioxide dispersion before the primer layer is completely cured, and is used to fill micro pores in the primer layer, further improving the compactness and corrosion resistance of the coating.

4. A cement concrete surface coating structure with acid and corrosion resistance, characterized in that: The method for preparing the cement concrete surface coating structure with acid-resistant and anti-corrosion functions comprises the following steps: Step 1, base layer processing: Clean the concrete surface, remove oil, dust and impurities, and ensure it is dry and flat; Step 2, Primer Application: Apply the modified epoxy resin primer evenly on the concrete surface to penetrate and seal the pores of the base layer; Step 3, nanofiller filling: Before the primer is completely cured, spray or roll on the nano-silicon dioxide dispersion to fill the micropores in the primer; Step 4, topcoat application: After the base layer is dry, the polyurea topcoat is applied by spraying to form a continuous and uniform protective layer; Step 5, surface treatment: After the topcoat is cured, use fluorosilane or other hydrophobic agents for surface treatment.

5. The cement concrete surface coating structure with acid and corrosion resistance as claimed in claim 4, characterized in that: The base layer treatment: 1) Use a high-pressure water gun to thoroughly clean the concrete surface to remove oil, dust, and loose particles; 2) For uneven or cracked surfaces, use an angle grinder or wire brush to grind them to ensure a smooth surface; 3) After the surface is dry, check for leaks or seepage. If found, repair them.

6. The cement concrete surface coating structure with acid and corrosion resistance as claimed in claim 4, characterized in that: The primer is applied: (1) Mix the primer and diluent in proportion according to the primer product instructions; (2) Use a roller, sprayer or brush to evenly apply the primer to the concrete surface, ensuring that the coating thickness meets the requirements; apply evenly.

7. The cement concrete surface coating structure with acid and corrosion resistance as claimed in claim 4, characterized in that: The nanofiller fills: Before the primer is completely cured, use a sprayer or roller to evenly spray or roll the nano-silicon dioxide dispersion onto the primer surface; Control the spraying or rolling speed to ensure uniform distribution of nanofillers; After the nanofiller is dried, it can be coated multiple times as needed.

8. The cement concrete surface coating structure with acid and corrosion resistance as claimed in claim 4, characterized in that: The topcoat is applied: After the base layer is dry, use a sprayer to evenly spray the polyurea topcoat on the base layer surface; Control the spraying distance and angle to ensure uniform coating thickness; Apply multiple coats as needed until the designed thickness is reached.

9. The cement concrete surface coating structure with acid and corrosion resistance as claimed in claim 4, characterized in that: The surface treatment: After the topcoat is completely cured, use a sprayer or brush to evenly apply the hydrophobic agent to the topcoat surface; Control coating amount; After the hydrophobic agent dries, the coating can be put into use.

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