Anti-corrosion coating for dam panel and preparation process of anti-corrosion coating

Abstract

The invention discloses an anticorrosive coating for a dam panel and a preparation process of the anticorrosive coating, and belongs to the technical field of surface treatment and coatings. The anticorrosive paint is prepared from the following raw materials: 30 to 45 parts of isophorone diisocyanate modified epoxy resin, 15 to 24 parts of carbamate modified epoxy vinyl ester resin, 25 to 35 parts of VITEL copolyester resin, 3 to 8 parts of a curing agent, 20 to 30 parts of pigment and filler, 1 to 3 parts of a functional auxiliary agent and a sufficient amount of a solvent. A coating composite resin system is constructed by adopting various resins and corresponding modification treatment, the high-performance anti-corrosion coating is finally prepared, the high-performance anti-corrosion coating has high cohesiveness and excellent weather resistance, chemical corrosion resistance and durability stability, the anti-corrosion requirement of a dam panel water level amplitude variation area can be met, the service life of the dam panel water level amplitude variation area is prolonged, the maintenance cost is reduced, and the service life of the dam panel water level amplitude variation area is prolonged. And the safety and the stability of the water conservancy project are effectively ensured.

Description

Technical Field

[0001] The invention belongs to the technical field of surface treatment and coatings, and specifically relates to an anti-corrosion coating for dam panels and a preparation process thereof. Background Art

[0002] The development of water conservancy is closely related to human civilization. The earliest water conservancy can be traced back to 4,000 to 5,000 BC. Today, with the continuous development of modern industry and technology, various water conservancy projects have economic, social and environmental ecological benefits, and have a huge impact on human life.

[0003] A dam is an important hydraulic structure. It not only undertakes multiple functions such as water storage, power generation, and flood control, but is also a key facility to ensure regional economic development and the safety of people's lives and property. However, in the long-term operation of the dam, especially in the water level fluctuation area, it faces severe anti-corrosion challenges. The dam water level fluctuation area refers to the area in the reservoir where the water level changes significantly with factors such as seasons and climate. Due to the frequent fluctuations in water levels in these areas, building materials such as concrete and metal are exposed to a wet, dry and wet environment for a long time. The river water also contains salt and other corrosive substances, making the water level fluctuation area extremely susceptible to corrosion damage. The corrosion of concrete panels often leads to honeycomb and exposed steel bars on the surface, thereby reducing the bearing capacity of the structure, while the corrosion of metal structures will lead to a reduction in surface area and strength, which may cause hazards such as spalling and cracks, seriously affecting the safety and stability of the dam.

[0004] At present, the measures adopted by the industry to address the corrosion problem in the water level fluctuation zone include coating protection, isolation layer protection, and electrochemical protection. However, the construction of the isolation layer requires a high level of technology and construction accuracy, and the selection of isolation layer materials is also more demanding for different dam panel substrates. The electrochemical protection system has a relatively complex structure and is highly sensitive to environmental conditions. The need for regular replacement of anode materials further increases the maintenance cost and difficulty. Coating protection, as the most commonly used anti-corrosion method, blocks direct contact between concrete or metal and the surrounding medium by applying an anti-corrosion coating, and has relatively excellent comprehensive anti-corrosion performance; however, with the increasing demand for dam structure protection, the durability and stability of single coatings such as cement mortar layers, polymer modified layers, and permeable coatings in complex environments such as high-speed water flow scouring, temperature changes, and frequent alternations between dry and wet can no longer meet the use requirements. Summary of the invention

[0005] In view of the content of the background technology, the purpose of the present invention is to provide an anti-corrosion coating for dam panels and its preparation process. The present invention adopts a variety of resins and corresponding modification treatments to construct a coating composite resin system, and finally prepares a multi-component composite high-performance anti-corrosion coating, which has high adhesion and excellent weather resistance, chemical corrosion resistance and durable stability, and can ensure the safety and stability of water conservancy engineering facilities such as dams.

[0006] In order to achieve the above object, the present invention specifically adopts the following technical solutions: The present invention provides an anticorrosive coating for dam panels, which comprises the following raw materials in parts by weight: 30-45 parts of isophorone diisocyanate modified epoxy resin, 15-24 parts of urethane modified epoxy vinyl ester resin, VITEL copolyester resin 25-35 parts, 3-8 parts of curing agent, 20-30 parts of pigments and fillers, Functional additives 1-3 parts, Sufficient solvent.

[0007] Furthermore, the preparation method of the isophorone diisocyanate modified epoxy resin is: adding isophorone diisocyanate to epoxy resin, adding a catalyst and heating to 70-80° C., washing and drying after the reaction is completed, and thus the isophorone diisocyanate modified epoxy resin is obtained.

[0008] Furthermore, the addition amount of the isophorone diisocyanate is 0.6%-1% of the mass of the epoxy resin, and the reaction time is 6-8 h; the epoxy resin is bisphenol A type epoxy resin, and the catalyst is dibutyltin dilaurate.

[0009] Furthermore, the preparation method of the carbamate-modified epoxy vinyl ester resin is: using bisphenol A type epoxy vinyl ester resin as a matrix, adding a carbamate-forming agent and mixing under the protection of an inert gas, and at the same time adding carboxylated nanocellulose and a catalyst, heating to 80-95° C., stirring and mixing, removing impurities, washing, and drying to obtain the carbamate-modified epoxy vinyl ester resin.

[0010] Furthermore, the urethane-forming agent is toluene diisocyanate, and its addition amount is 4%-6% of the mass of bisphenol A epoxy vinyl ester resin; the addition amount of the carboxylated nanocellulose is 0.05%-0.3% of the mass of bisphenol A epoxy vinyl ester resin.

[0011] Furthermore, the curing agent is a polyamide curing agent.

[0012] Furthermore, the pigment filler consists of titanium dioxide, zinc oxide and talcum powder.

[0013] Furthermore, the functional additives include a leveling agent and a defoaming agent.

[0014] The present invention also provides a method for preparing the above-mentioned anti-corrosion coating for dam panels, comprising: weighing each raw material according to the formula dosage, mixing isophorone diisocyanate-modified epoxy resin, urethane-modified epoxy vinyl ester resin, and VITEL copolyester resin, adding an appropriate amount of solvent at 60-75°C to adjust the viscosity, then adding a curing agent to the obtained mixture, and finally adding color fillers and functional additives to disperse evenly to obtain the anti-corrosion coating.

[0015] The present invention adopts isophorone diisocyanate modified epoxy resin, carbamate modified epoxy vinyl ester resin and VITEL copolyester resin to construct a coating resin system; isophorone diisocyanate contains two isocyanate groups in its molecular structure, which can react with active groups such as hydroxyl or amine groups of epoxy resin to form a basic cross-linking network, thereby ensuring good impact resistance and chemical resistance of the coating; and the modification of epoxy vinyl ester resin by carbamate can significantly improve the adhesion performance of the coating to the surfaces of different concrete metal materials, and its combined intrachain unsaturation and chain end unsaturation can also greatly improve the weather resistance, corrosion resistance and durable stability of the coating in combination with isophorone diisocyanate modified epoxy resin and VITEL copolyester resin. VITEL copolyester resin can balance the performance of the mixed resin system, further improving the mechanical properties and corrosion resistance.

[0016] The present invention also provides the use of the above-mentioned anti-corrosion coating for dam panels in the anti-corrosion of the water level variation area of ​​the dam panels.

[0017] Compared with the prior art, the present invention has the following beneficial effects: 1. The anti-corrosion coating prepared by the process of the present invention has high adhesion and excellent weather resistance, chemical corrosion resistance and durable stability. It has excellent performance and a simple preparation method, and is suitable for industrial production.

[0018] 2. The anti-corrosion coating of the present invention can effectively cope with complex environmental conditions such as high-speed water flow erosion in water level fluctuation areas, large temperature changes, frequent dry and wet alternations, etc., thereby extending its service life, reducing maintenance costs, and ensuring the safety and stability of water conservancy engineering facilities such as dams. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical scheme and advantages of the present invention clearer, the technical scheme of the present invention will be clearly and completely described below in conjunction with the embodiments. If the specific conditions are not specified in the embodiments, they are carried out according to the conventional conditions or the conditions recommended by the manufacturer. If the manufacturer of the reagents or instruments is not specified, they are all conventional products that can be purchased commercially.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0021] Example 1 An anti-corrosion coating for a dam panel water level variation zone, the preparation method comprising: 1. Add 0.8 parts of isophorone diisocyanate and 0.5 parts of dibutyltin dilaurate to 100 parts of E44 epoxy resin, heat to 75°C, continue stirring and react for 7 hours, wash and dry after the reaction to obtain isophorone diisocyanate-modified epoxy resin.

[0022] 2. Under the protection of nitrogen atmosphere, add 5 parts of toluene diisocyanate, 0.2 parts of carboxylated nanocellulose, and 0.5 parts of organic tin catalyst to 100 parts of preheated bisphenol A epoxy vinyl ester resin, heat to 90°C and mix and stir for 12 hours, remove impurities, wash, and dry to obtain carbamate-modified epoxy vinyl ester resin.

[0023] 3. Weigh 40 parts of the obtained isophorone diisocyanate modified epoxy resin, 20 parts of the obtained carbamate modified epoxy vinyl ester resin, 30 parts of VITEL copolyester resin (VPE-5545), 6 parts of polyamide curing agent, 24 parts of pigments and fillers (8 parts of titanium dioxide, 8 parts of zinc oxide, 8 parts of talcum powder), 2.4 parts of functional additives (1.4 parts of leveling agent BYK-333, 1 part of defoamer SRE-2201-6), and sufficient amount of ethyl acetate. Mix the isophorone diisocyanate modified epoxy resin, carbamate modified epoxy vinyl ester resin, and VITEL copolyester resin, add appropriate amount of ethyl acetate at 65°C to adjust the viscosity, then add polyamide curing agent to the obtained mixture and stir thoroughly (10 h), and finally add pigments and fillers and functional additives and stir until they are completely dispersed to obtain an anti-corrosion coating.

[0024] Example 2 An anti-corrosion coating for a dam panel water level variation zone, the preparation method comprising: 1. Add 0.6 parts of isophorone diisocyanate and 0.5 parts of dibutyltin dilaurate to 100 parts of E44 epoxy resin, heat to 75°C, continue stirring and react for 8 hours, wash and dry after the reaction to obtain isophorone diisocyanate-modified epoxy resin.

[0025] 2. Under the protection of nitrogen atmosphere, add 6 parts of toluene diisocyanate, 0.05 parts of carboxylated nanocellulose, and 0.5 parts of organic tin catalyst to 100 parts of preheated bisphenol A epoxy vinyl ester resin, heat to 90 ° C and stir continuously for 12 h, remove impurities, wash, and dry to obtain carbamate modified epoxy vinyl ester resin.

[0026] 3. Weigh 30 parts of the obtained isophorone diisocyanate modified epoxy resin, 15 parts of the obtained carbamate modified epoxy vinyl ester resin, 25 parts of VITEL copolyester resin (VPE-5545), 3 parts of polyamide curing agent, 20 parts of pigments and fillers (7 parts of titanium dioxide, 6 parts of zinc oxide, 7 parts of talc), 1.2 parts of functional additives (0.6 parts of leveling agent BYK-333, 0.6 parts of defoaming agent SRE-2201-6), and sufficient amount of ethyl acetate. Mix the isophorone diisocyanate modified epoxy resin, carbamate modified epoxy vinyl ester resin, and VITEL copolyester resin, add appropriate amount of ethyl acetate at 65°C to adjust the viscosity, then add polyamide curing agent to the obtained mixture and stir thoroughly (10 h), and finally add pigments and fillers and functional additives and stir until they are completely dispersed to obtain an anti-corrosion coating.

[0027] Example 3 An anti-corrosion coating for a dam panel water level variation zone, the preparation method comprising: 1. Add 1 part of isophorone diisocyanate and 0.5 part of dibutyltin dilaurate to 100 parts of E44 epoxy resin, heat to 75°C, continue stirring and react for 6 hours, wash and dry after the reaction to obtain isophorone diisocyanate modified epoxy resin.

[0028] 2. Under the protection of nitrogen atmosphere, add 4 parts of toluene diisocyanate, 0.3 parts of carboxylated nanocellulose, and 0.5 parts of organic tin catalyst to 100 parts of preheated bisphenol A epoxy vinyl ester resin, heat to 90°C and mix and stir for 12 hours, remove impurities, wash, and dry to obtain carbamate-modified epoxy vinyl ester resin.

[0029] 3. Weigh 45 parts of the obtained isophorone diisocyanate modified epoxy resin, 24 parts of the obtained carbamate modified epoxy vinyl ester resin, 35 parts of VITEL copolyester resin (VPE-5545), 8 parts of polyamide curing agent, 30 parts of pigments and fillers (10 parts of titanium dioxide, 10 parts of zinc oxide, 10 parts of talcum powder), 3 parts of functional additives (1.8 parts of leveling agent BYK-333, 1.2 parts of defoaming agent SRE-2201-6), and sufficient amount of ethyl acetate. Mix the isophorone diisocyanate modified epoxy resin, carbamate modified epoxy vinyl ester resin, and VITEL copolyester resin, add appropriate amount of ethyl acetate at 70°C to adjust the viscosity, then add polyamide curing agent to the obtained mixture and stir thoroughly (10 h), and finally add pigments and fillers and functional additives and stir until they are completely dispersed to obtain an anti-corrosion coating.

[0030] Comparative Example 1 Referring to the step parameters in Example 1, the difference is that isophorone diisocyanate is not used to modify the epoxy resin, that is, E44 epoxy resin is directly used to replace the isophorone diisocyanate-modified epoxy resin in step 3.

[0031] Comparative Example 2 Referring to the step parameters in Example 1, the difference is that toluene diisocyanate is not used to modify the epoxy vinyl ester resin, that is, bisphenol A type epoxy vinyl ester resin is directly used to replace the carbamate-modified epoxy vinyl ester resin in step 3.

[0032] Comparative Example 3 Referring to the step parameters in Example 1, the difference is that the raw material resin system is adjusted and VITEL copolyester resin is not used; that is, the amount of resin raw materials used is: 60 parts of isophorone diisocyanate modified epoxy resin and 30 parts of urethane modified epoxy vinyl ester resin.

[0033] Comparative Example 4 Referring to the step parameters in Example 1, the difference is that the modification method in step 2 is adjusted as follows: under the protection of a nitrogen atmosphere, 5 parts of toluene diisocyanate and 0.5 parts of an organic tin catalyst are added to 100 parts of preheated bisphenol A epoxy vinyl ester resin, the temperature is raised to 90°C, the mixture is stirred continuously for 12 hours, impurities are removed, washed, and dried to obtain a carbamate-modified epoxy vinyl ester resin.

[0034] Test example The coating samples prepared in the above embodiments and comparative examples were subjected to performance tests (GB / T 9755-2014, GB / T13657-2011, GB / T 50590-2010), and the results are shown in the following table.

[0035] Table 1

[0036] In summary, the anticorrosive coating prepared by the present invention has good adhesion to metal and concrete, excellent weather resistance, especially chemical resistance, good stability, and can be applied to dam water level fluctuation areas with high-speed water flow scouring, temperature changes, and frequent dry-wet alternation, overcoming the defect of insufficient durability of existing single coatings. The multi-component composite anticorrosive coating of the present invention has excellent performance, a simple preparation method, and is suitable for industrial production.

[0037] The embodiments described above only express several preferred embodiments of the present invention, and the descriptions thereof are relatively specific and detailed, but are not intended to limit the present invention. It should be noted that for those skilled in the art, the present invention may also have various changes and modifications, and any modifications, equivalent substitutions, improvements, etc. made within the concept and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An anticorrosive coating for dam panels, characterized in that: The anticorrosive coating comprises the following raw materials by weight: 30-45 parts of isophorone diisocyanate modified epoxy resin, 15-24 parts of urethane modified epoxy vinyl ester resin, VITEL copolyester resin 25-35 parts, 3-8 parts of curing agent, 20-30 parts of pigments and fillers, Functional additives 1-3 parts, Sufficient solvent.

2. The anticorrosive coating for dam panels according to claim 1, characterized in that: The preparation method of the isophorone diisocyanate modified epoxy resin is as follows: adding isophorone diisocyanate to epoxy resin, adding a catalyst and heating to 70-80° C., washing and drying after the reaction is completed, and thus the isophorone diisocyanate modified epoxy resin is obtained.

3. The anticorrosive coating for dam panels according to claim 2, characterized in that: The addition amount of isophorone diisocyanate is 0.6%-1% of the mass of the epoxy resin, and the reaction time is 6-8 hours; the epoxy resin is bisphenol A type epoxy resin, and the catalyst is dibutyltin dilaurate.

4. The anticorrosive coating for dam panels according to claim 1, characterized in that: The preparation method of the carbamate-modified epoxy vinyl ester resin is as follows: taking bisphenol A type epoxy vinyl ester resin as a matrix, adding a carbamate-forming agent and mixing under the protection of an inert gas, adding carboxylated nanocellulose and a catalyst, heating to 80-95° C., stirring and mixing, removing impurities, washing, and drying to obtain the carbamate-modified epoxy vinyl ester resin.

5. The anticorrosive coating for dam panels according to claim 4, characterized in that: The urethane-forming agent is toluene diisocyanate, and the addition amount thereof is 4%-6% of the mass of the bisphenol A epoxy vinyl ester resin; the addition amount of the carboxylated nanocellulose is 0.05%-0.3% of the mass of the bisphenol A epoxy vinyl ester resin.

6. The anticorrosive coating for dam panels according to claim 1, characterized in that: The curing agent is a polyamide curing agent.

7. The anticorrosive coating for dam panels according to claim 1, characterized in that: The pigment and filler are composed of titanium dioxide, zinc oxide and talcum powder.

8. The anticorrosive coating for dam panels according to claim 1, characterized in that: The functional additives include leveling agents and defoaming agents.

9. The method for preparing the anticorrosive coating for dam panels according to any one of claims 1 to 8, characterized in that: include: Weigh each raw material according to the formula amount, mix isophorone diisocyanate modified epoxy resin, urethane modified epoxy vinyl ester resin, and VITEL copolyester resin, add a proper amount of solvent at 60-75°C to adjust the viscosity, then add a curing agent to the resulting mixture, and finally add pigments, fillers and functional additives and disperse them evenly to obtain an anti-corrosion coating.

10. Use of the anti-corrosion coating for dam panels according to any one of claims 1 to 8 in the anti-corrosion of the dam panel water level fluctuation area.

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