Anti-corrosion, anti-cracking, elastic and wind-sand-resistant coating for concrete piers and preparation method thereof

Abstract

The invention relates to the technical field of anticorrosive coatings, in particular to an anticorrosive anti-cracking elastic wind-sand-resistant coating for a concrete pier and a preparation method of the anticorrosive anti-cracking elastic wind-sand-resistant coating. According to the anti-corrosion anti-cracking elastic wind-sand-resistant coating for the concrete bridge pier, the self-repairing elastic cement mortar capsule is added into the primer, and concrete cracks can be automatically repaired in time; a combination of modified inorganic silicon carbide wear-resistant ceramic particles and elastic polyurethane resin is adopted in the finish paint, so that the finish paint has excellent wear resistance, impact resistance and ultraviolet irradiation resistance, and can provide effective protection under the weather of heavy sand storm and strong ultraviolet; in addition, the primer and the finish paint have good chemical resistance, salt water resistance and impermeability, and can adapt to saline-alkali soil and hydrological environment. The invention also provides a preparation method of the coating, the concrete pier protective coating with excellent wear resistance, ultraviolet radiation resistance, chemical resistance, brine resistance and concrete self-repairing function is prepared through a simple, easy-to-control and low-energy-consumption process, and considerable economic benefits are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of anti-corrosion coatings, and in particular to an anti-corrosion, anti-cracking, elastic and wind-sand resistant coating for concrete bridge piers and a preparation method thereof. Background Art

[0002] Concrete bridge piers are a crucial component of bridge structures. Exposure to the elements for extended periods of time exposes them to a variety of complex erosion and destructive factors. In harsh environments, such as those in the northwest, concrete piers are not only corroded by moisture, oxygen, carbon dioxide, and harmful chemicals in the air, leading to concrete carbonization and steel corrosion, but are also subject to abrasion from strong winds and sandstorms, as well as intense ultraviolet radiation, causing cracks and spalling on the pier surfaces, severely impacting the lifespan and safety of bridges.

[0003] Currently, bridge piers are typically treated with protective coatings to prevent corrosion and cracking. Chinese patent CN102391773A, issued on March 28, 2012, discloses an elastic, wind-resistant, abrasion-resistant, weather-resistant, and temperature-resistant coating and its preparation method. This coating, based on an elastic polyester resin and an epoxy-silicone-modified fluorocarbon resin, exhibits excellent elasticity and wear resistance, offering long-term resistance to wind and sand impacts and deformation at high and low temperatures.

[0004] On October 14, 2015, Chinese patent CN104974618A disclosed an anti-wind and sand coating for transmission towers in Gobi environments and its preparation method. The coating is dispersed from water-dispersible epoxy acrylic resin and amino resin, and nano-MoS2 wear-resistant agent is added to improve the wear resistance of the coating and enhance the tower surface's resistance to wind and sand erosion.

[0005] Chinese patent CN110551434A disclosed on December 10, 2019, a method for preparing a wind-sand-resistant and anti-corrosion protective coating. The wind-sand-resistant and anti-corrosion protective coating is obtained by mixing and dispersing latex powder, epoxy resin emulsion, and hydrated alumina sol, and adding a self-emulsifying water-based epoxy curing agent. The coating is coated on the substrate by electrophoretic deposition.

[0006] While existing protective coatings for concrete bridge piers offer some degree of corrosion and crack prevention, they lack the self-healing ability to repair cracks on the pier surface, preventing them from repairing them in a timely manner. This leads to gradual expansion of the cracks, which in turn compromises their protective effectiveness. Furthermore, existing coatings also need to improve their resistance to abrasion, wind, sand, and strong UV radiation. This is particularly true in the strong winds and UV rays of the Northwest region, where the coatings are prone to wear and aging, requiring frequent maintenance and replacement, increasing maintenance costs.

[0007] Therefore, the development of a coating with self-repairing function that can effectively prevent concrete bridge piers from cracking and at the same time has excellent wear resistance, wind and sand resistance, and resistance to strong ultraviolet radiation has important practical significance and is still a problem that needs to be solved by technical personnel in this field. Summary of the Invention

[0008] In order to solve the problem of how to develop a concrete bridge pier protective coating with self-repairing function, wear resistance, wind and sand resistance, and strong ultraviolet radiation resistance, the present invention provides a concrete bridge pier anti-corrosion, anti-cracking, elastic and wind and sand resistance coating, including a primer and a topcoat; The primer is a three-component epoxy mortar self-repairing coating, including primer A component, primer B component and primer C component; The raw materials of the primer component A include modified epoxy resin liquid, additives and solvents; The primer component B includes a modified amine curing agent; The primer C component includes self-repairing elastic cement mortar capsules; The primer component A, primer component B and primer component C are compounded in a weight ratio of (4-6): (1-3): (6-10); The topcoat is a two-component organic-inorganic hybrid elastic polyurethane coating, comprising a topcoat component A and a topcoat component B; The raw materials of the topcoat component A include elastic polyurethane resin and modified inorganic silicon carbide wear-resistant ceramic particles in a weight ratio of (5-16): (3-6), and also include fillers, additives and solvents; The topcoat component B includes an HDI curing agent; The topcoat component A and topcoat component B are compounded in a weight ratio of (6-10):1.

[0009] In one embodiment, the distribution ratio of each group is as follows in parts by weight: Primer component A: 20~40 parts of modified epoxy resin liquid 1~5 parts of additives 2~4 parts solvent Primer component B: 5-10 parts of modified amine curing agent Primer C component: 40~60 parts of self-repairing elastic cement mortar capsules Topcoat component A: 40~80 parts of elastic polyurethane resin 15-30 parts of modified inorganic silicon carbide wear-resistant ceramic particles 10~20 parts of filler 2~6 parts of additives 3~10 parts solvent Topcoat component B: 8-15 parts of HDI curing agent.

[0010] In one embodiment, the raw materials of the modified epoxy resin liquid include any one or more of E51 resin and E44 resin and a reactive diluent.

[0011] In one embodiment, the self-healing elastic cement mortar capsule consists of a shell layer and a core layer; wherein, the shell layer includes polymer elastic nano-rubber particles; the polymer elastic nano-rubber particles are any one or more of nitrile rubber, acrylic rubber, silicone rubber elastomer and acrylic elastomer; the core layer includes modified nano-calcium carbonate, wollastonite powder, cement and solid surfactant.

[0012] In one embodiment, the raw materials of the modified inorganic silicon carbide wear-resistant ceramic particles include inorganic silicon carbide particles and a coupling agent.

[0013] In one embodiment, the elastic polyurethane resin is any one or more of acrylic modified polyurethane resin, polyester resin and polyether resin; the auxiliary agent is any one or more of BYK-203, BYK-220s, EFKA4010, EFKA4665, BYK-A530, BYK-331 and Tego-415; the solvent is any one or more of xylene, n-butanol, butyl acetate, propylene glycol methyl ether acetate, isopropyl alcohol and propylene glycol methyl ether; the filler is any one or more of precipitated barium sulfate, talc powder, feldspar powder and mica powder; the modified amine curing agent is any one or more of Sanmu T31, HENST H-1031A, Baisheng T31L and Shengquan CR231D; the HDI curing agent is any one or more of Bayer N3800, Bayer N3300, Asahi Kasei E405 and Wanhua HT-100.

[0014] The present invention also provides a coating preparation method for preparing the above-mentioned concrete bridge pier anti-corrosion, anti-cracking, elastic and wind-sand resistant coating, comprising the following steps: Preparation of primer: Add the modified epoxy resin liquid, additives and solvent into the reactor in sequence, and stir at 500-1000 rpm for 30-60 minutes to obtain the primer component A; Separately package the modified amine curing agent to obtain the primer component B; Separately pack the self-repairing elastic cement mortar capsules to obtain the primer C component; The primer component A, the primer component B, and the primer component C are mixed and evenly mixed in a weight ratio of (4-6): (1-3): (6-10) to obtain the concrete bridge pier anti-corrosion, anti-cracking, elastic, and anti-wind and sand coating primer; Preparation of topcoat: Adding elastic polyurethane resin and modified inorganic silicon carbide wear-resistant ceramic particles into a reaction kettle, stirring at 600-1200 rpm for 40-70 min to obtain an organic-inorganic hybrid elastic polyurethane resin liquid; Adding fillers, additives and solvents to the organic-inorganic hybrid elastic polyurethane resin solution in sequence, and dispersing at high speed for 40 to 80 minutes to obtain topcoat component A; Separately package the HDI curing agent to obtain the topcoat component B; The topcoat component A and the topcoat component B are mixed and evenly stirred in a weight ratio of (6-10):1 to obtain the concrete bridge pier anti-corrosion, anti-cracking, elastic and anti-wind and sand coating topcoat.

[0015] In one embodiment, the modified epoxy resin liquid is prepared by the following steps: Epoxy resin and plasticizer are added to a container in a weight ratio of (2-8):1 to obtain a mixed solution, and then 5%-7% of the weight of the mixed solution by active diluent and 3%-4% of the weight of the mixed solution by coupling agent are added. The mixture is dispersed by a magnetic rotor for 8-15 minutes, heated to reflux temperature, kept warm for 1.5-2.5 hours, cooled and discharged to obtain the modified epoxy resin liquid.

[0016] In one embodiment, the self-repairing elastic cement mortar capsule is prepared by the following steps: Add 10-20 parts by weight of polymer elastic nano rubber particles to 50-80 parts by weight of an organic solvent, heat to 80-100°C, keep warm for 30-60 minutes, and stir until completely dissolved to obtain a shell solution; Nano-calcium carbonate, wollastonite powder, cement and solid surfactant are mixed in a weight ratio of (1-3): (0.5-1.5): (5-8): (0.5-1) to obtain a core layer mixture; Under stirring conditions, the core layer mixture is slowly added to the shell layer solution to form an elastic microsphere powder liquid, and the elastic microsphere powder liquid is then dispersed at high speed for 36 to 60 hours; The dispersed elastic microsphere powder liquid is filtered through a filter, and the filtrate is washed with anhydrous ethanol 2 to 3 times, and dried at 60 to 80° C. for 12 to 24 hours to obtain the self-repairing elastic cement mortar capsule.

[0017] In one embodiment, the modified inorganic silicon carbide wear-resistant ceramic particles are prepared by the following steps: Dilute with anhydrous ethanol to obtain a 1% fluorosilane solution; Add 50-80 parts by weight of silicon carbide particles to 200-300 parts by weight of 1% fluorosilane solution, then add 2-5 parts by weight of coupling agent, and stir at 60-90°C and 300-600 rpm for 2-4 hours. After the reaction is completed, the solution is filtered to obtain particles, which are washed with ethanol 2-3 times and dried at 80-100° C. for 8-12 hours to obtain the modified inorganic silicon carbide wear-resistant ceramic particles.

[0018] In summary, compared with the prior art, the present invention has the following beneficial effects: The anti-corrosion, anti-cracking, elastic, and wind-sand-resistant coating for concrete bridge piers provided by the present invention includes a primer and a topcoat. The primer uses self-repairing elastic cement mortar capsules as fillers, which automatically repair concrete cracks and effectively prevent further crack expansion. The topcoat, which contains modified inorganic silicon carbide wear-resistant ceramic particles and elastic polyurethane resin, exhibits excellent wear resistance, impact resistance, and UV resistance, making it well suited to the strong winds and sandstorms and strong UV-resistant climate conditions in the Northwest region and capable of long-term use without aging. Furthermore, both the primer and topcoat exhibit excellent chemical resistance and are adaptable to the saline-alkali soil and water environment characteristics of the Northwest region. In summary, the anti-corrosion, anti-cracking, elastic, and wind-sand-resistant coating for concrete bridge piers exhibits excellent overall coating performance, meets technical standards, and possesses multiple weathering properties. It is suitable for protecting concrete bridge piers in the Northwest region's windy, sandstorm, saline-alkali, and strong UV-resistant climates.

[0019] In particular, the coating has a simple construction process, high construction efficiency, and low construction emissions. It is used in the protection construction of concrete bridge piers in the northwest region, reducing labor costs, having little impact on the environment, and having good economic, social and ecological benefits.

[0020] The coating preparation method provided by the present invention prepares a corrosion-resistant, anti-cracking, elastic and wind-sand-resistant coating for concrete bridge piers with good comprehensive coating properties and excellent coating weathering properties through a simple preparation process with low equipment requirements, easy control of process parameters and low production energy consumption. The method can realize industrial production and has high practical value. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 A 500x scanning electron microscope image of the elastic microsphere powder of the self-repairing elastic cement mortar capsule provided by an embodiment of the present invention; Figure 2 A 1000x scanning electron microscope image of the elastic microsphere powder of the self-repairing elastic cement mortar capsule provided in an embodiment of the present invention; Figure 3This is a picture of the on-site test of the concrete bridge pier anti-corrosion, anti-cracking, elastic and anti-wind and sand coating primer provided in Example 2 of the present invention on the Jiayuguan Railway Bridge. DETAILED DESCRIPTION

[0023] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention are clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0024] In an embodiment of the present invention, the modified epoxy resin liquid is prepared by the following steps: S101, adding 4 parts of epoxy resin E51, 2 parts of epoxy resin E44 and 1 part of dibutyl phthalate to a three-necked flask by weight to obtain a mixed solution; S102, adding 5% by weight of the mixed solution of active diluent AGE and 3% by weight of the mixed solution of coupling agent KH550 to the container; S103, disperse using a magnetic rotor for 10 min; S104, heating to reflux temperature, keeping the temperature for 2 hours, cooling and discharging, thereby obtaining the modified epoxy resin liquid.

[0025] In an embodiment of the present invention, the self-repairing elastic cement mortar capsule is prepared by the following steps: S201, adding 10 parts by weight of nitrile rubber to 50 parts of NN dimethyl pyrrolidone, heating to 85° C., keeping warm for 45 minutes, and stirring until completely dissolved to obtain a shell solution; S202, mixing 20 parts of nano-calcium carbonate, 10 parts of wollastonite powder, 60 parts of cement, and 5 parts of solid surfactant, by weight, to obtain a core layer mixture; S203, under stirring conditions of 200 rpm, slowly adding the core layer mixture to the shell layer solution within 30 minutes to form an elastic microsphere powder liquid, and then placing the elastic microsphere powder liquid into a planetary centrifugal grinder for high-speed dispersion for 48 hours, and performing electron microscopic scanning on the dispersed elastic microsphere powder liquid, see Figure 1 、 Figure 2 As shown, it can be seen that the particle size of the elastic microsphere powder ranges from 80 to 100 nm; S204, filtering the dispersed elastic microsphere powder liquid through a 100-mesh filter, washing the filtrate with anhydrous ethanol three times, and drying at 60° C. for 24 h to obtain the self-repairing elastic cement mortar capsule.

[0026] In an embodiment of the present invention, the modified silicon carbide wear-resistant ceramic particles are prepared by the following steps: S301, mixing 5 parts by weight of fluorosilane with 495 parts of anhydrous ethanol, and diluting to obtain a 1% fluorosilane solution; S302, adding 50 parts by weight of silicon carbide particles to 300 parts of 1% fluorosilane solution, and then adding 3 parts of coupling agent KH560, and stirring at 90° C. and 600 rpm for 4 hours; S303. After the reaction is completed, the solution is filtered through a 100-mesh filter to obtain particles, the particles are washed twice with ethanol, and dried at 100° C. for 12 h to obtain the modified inorganic silicon carbide wear-resistant ceramic particles.

[0027] Example 1 This embodiment provides an anti-corrosion, anti-cracking, elastic and anti-wind and sand coating for concrete bridge piers, which is prepared by the following steps: (1) Preparation of primer 25 parts of modified epoxy resin liquid, 1.5 parts of EFKA4010 and 2 parts of xylene were added to a reaction kettle in sequence by weight and stirred at 600 rpm for 40 min to obtain primer component A. Separately package 2.5 parts by weight of a modified amine curing agent to obtain a primer component B; Separately packaging 55 parts by weight of self-repairing elastic cement mortar capsules to obtain primer C component; Mix the primer component A, primer component B and primer component C in a weight ratio of 4:1:6 to obtain the concrete pier anti-corrosion, anti-cracking, elastic and wind-sand resistant coating primer, which can be applied on site by scraping, rolling or spraying.

[0028] (2) Preparation of topcoat 50 parts by weight of an elastic polyurethane resin and 20 parts of modified inorganic silicon carbide wear-resistant ceramic particles were added to a reaction kettle and stirred at 600 rpm for 70 minutes to obtain an organic-inorganic hybrid elastic polyurethane resin liquid. 12 parts of precipitated barium sulfate, 2.5 parts of EFKA4665, and 7 parts of propylene glycol methyl ether acetate were then added to the organic-inorganic hybrid elastic polyurethane resin liquid in sequence, and the mixture was dispersed at high speed for 40 minutes to obtain a topcoat component A. 12.5 parts of Bayer N3800 were packaged separately to obtain topcoat component B; The topcoat component A and the topcoat component B are mixed at a weight ratio of 10:1 to obtain the concrete pier anti-corrosion, anti-cracking, elastic and wind-sand resistant coating topcoat, which can be applied on site by rolling or spraying.

[0029] Example 2 This embodiment provides an anti-corrosion, anti-cracking, elastic and anti-wind and sand coating for concrete bridge piers, which is prepared by the following steps: (1) Preparation of primer 30 parts by weight of modified epoxy resin liquid, 3.5 parts by weight of BYK-220s, and 4 parts by weight of n-butanol were added to a reaction kettle in sequence, and stirred at 800 rpm for 45 minutes to obtain primer component A. Separately package 7 parts by weight of a modified amine curing agent to obtain a primer component B; 44 parts by weight of self-repairing elastic cement mortar capsules were individually packaged to obtain primer C component; Mix the primer component A, primer component B and primer component C in a weight ratio of 4.4:1:8 to obtain the concrete pier anti-corrosion, anti-cracking, elastic and wind-sand resistant coating primer, which can be applied on site by scraping, rolling or spraying.

[0030] (2) Preparation of topcoat 80 parts by weight of an elastic polyurethane resin and 18 parts of modified inorganic silicon carbide wear-resistant ceramic particles were added to a reaction kettle and stirred at 900 rpm for 60 minutes to obtain an organic-inorganic hybrid elastic polyurethane resin liquid. 18 parts of feldspar powder, 4 parts of Tego-415, and 3 parts of butyl acetate were then added to the organic-inorganic hybrid elastic polyurethane resin liquid in this order, and the mixture was dispersed at high speed for 50 minutes to obtain a topcoat component A. 13 parts by weight of Asahi Kasei E405 were packaged separately to obtain topcoat component B; The topcoat component A and the topcoat component B are mixed in a weight ratio of 8:1 to obtain the concrete pier anti-corrosion, anti-cracking, elastic and wind-sand resistant coating topcoat, which can be applied on site by rolling or spraying.

[0031] Example 3 This embodiment provides an anti-corrosion, anti-cracking, elastic and anti-wind and sand coating for concrete bridge piers, which is prepared by the following steps: (1) Preparation of primer 33 parts of modified epoxy resin liquid, 2.7 parts of BYK-A530, and 2.9 parts of propylene glycol methyl ether were added to a reaction kettle in sequence, and stirred at 900 rpm for 53 min to obtain primer component A. Separately package 9.2 parts by weight of a modified amine curing agent to obtain a primer component B; Separately packaging 60 parts by weight of self-repairing elastic cement mortar capsules to obtain primer C component; Mix the primer component A, primer component B and primer component C in a weight ratio of 2:1:5 to obtain the concrete pier anti-corrosion, anti-cracking, elastic and wind-sand resistant coating primer, which can be applied on site by scraping, rolling or spraying.

[0032] (2) Preparation of topcoat 67 parts by weight of an elastic polyurethane resin and 15.5 parts of modified inorganic silicon carbide wear-resistant ceramic particles were added to a reaction kettle and stirred at 1100 rpm for 45 minutes to obtain an organic-inorganic hybrid elastic polyurethane resin liquid. 20 parts of talc, 3.1 parts of BYK-331, and 5 parts of isopropyl alcohol were then added to the organic-inorganic hybrid elastic polyurethane resin liquid in this order, and the mixture was dispersed at high speed for 80 minutes to obtain a topcoat component A. 8.8 parts by weight of Bayer N3300 were separately packaged to obtain topcoat component B; The topcoat component A and the topcoat component B are mixed at a weight ratio of 6.5:1 to obtain the concrete pier anti-corrosion, anti-cracking, elastic and wind-sand resistant coating topcoat, which can be applied on site by rolling or spraying.

[0033] The present invention also provides the following comparative examples 1 to 5, for preparing a concrete pier protective coating.

[0034] Comparative Example 1 The difference between this comparative example and Example 2 is that the raw materials of primer component A do not include modified epoxy resin liquid; the remaining raw materials, components, process parameters, and operating steps are consistent with those of Example 2 of the present invention.

[0035] Comparative Example 2 The difference between this comparative example and Example 2 is that the modified epoxy resin liquid in the primer component A is replaced with a mixture of epoxy resin E51, epoxy resin E44, and dibutyl phthalate in a weight ratio of 4:2:1; the remaining raw materials, components, process parameters, and operating steps are consistent with Example 2 of the present invention.

[0036] Comparative Example 3 The difference between this comparative example and Example 2 is that the self-repairing elastic cement mortar capsule of primer C component is not included; the remaining raw materials, components, process parameters, and operating steps are consistent with Example 2 of the present invention.

[0037] Comparative Example 4 The difference between this comparative example and Example 2 is that the raw materials of the topcoat component A do not include modified silicon carbide wear-resistant ceramic particles; the remaining raw materials, components, process parameters, and operating steps are consistent with those of Example 2 of the present invention.

[0038] Comparative Example 5 The difference between this comparative example and Example 2 is that the modified silicon carbide wear-resistant ceramic particles in the topcoat component A are replaced with silicon carbide particles; the remaining raw materials, components, process parameters, and operating steps are consistent with those of Example 2 of the present invention.

[0039] Performance tests were conducted on the concrete bridge pier anti-corrosion, anti-cracking, elastic and anti-wind and sand coatings prepared in Examples 1 to 3 and the concrete bridge pier protective coatings prepared in Comparative Examples 1 to 5. The performance test results of the coating primer are listed in Table 1, and the performance test results of the coating topcoat are listed in Table 2.

[0040] Table 1 Performance test results of concrete pier protective coating primer

[0041] Table 2 Performance test results of concrete pier protective coating topcoat

[0042] According to the performance test data of the coating primer in Table 1, the concrete bridge pier anti-corrosion, anti-cracking, elastic and anti-wind and sand coating primer provided by Examples 1 to 3 of the present invention has strong penetration shielding and excellent chemical resistance, and the impermeability is within 3×10 - 3 mg / cm 2 ·d or less, the acid and alkali resistance test results are good, and it is resistant to salt water, humidity and heat, and can adapt well to the weakly alkaline water, soil and sand environment in the northwest region.

[0043] In particular, the coating primer provided in Examples 1 to 3 of the present invention also has a concrete self-repairing function. When cracks appear in the concrete pier, due to the stress changes at the cracks, the self-repairing elastic cement mortar capsules will rupture, releasing the cement mortar in the core layer. The cement mortar can react with moisture in the air to fill and repair the cracks, and automatically repair concrete cracks with a crack width of ≤3 mm, effectively preventing the cracks from further expanding, and improving the anti-cracking performance and service life of the concrete pier.

[0044] In contrast, in Comparative Examples 1 to 3, component A and component C in the coating primer were changed respectively, and the impermeability and chemical resistance of the primers were significantly deteriorated. At the same time, the drying time could not meet the performance index requirements.

[0045] Further, according to the coating topcoat performance test data in Table 2, the coating topcoats provided by Examples 1 to 3 of the present invention have excellent performance in impact resistance, wear resistance, chemical resistance, etc., and the mass loss in the 1000-cycle abrasion test is ≤50 mg. This is because the modified inorganic silicon carbide wear-resistant ceramic particles have excellent wear resistance and hardness, can effectively resist the wear of wind and sand, and the coating has good apparent performance. Figure 3 This is a test photo of the concrete bridge pier anti-corrosion, anti-cracking, elastic and anti-wind and sand coating primer provided in Example 2 of the present invention on the on-site pier of the Jiayuguan Railway Bridge. The coating has a smooth surface, no bubbles, and good adhesion effect.

[0046] However, in Comparative Examples 4 and 5, no modified inorganic silicon carbide wear-resistant ceramic particles were added, and the impact resistance of the topcoat was significantly lower than the performance data of the embodiment, and could no longer meet the standard performance index requirements. At the same time, the adhesion and elongation at break of the topcoat were also poor. In the northwest region with strong winds, dust, dryness, and strong ultraviolet rays, the coating was easy to peel off and could not provide effective protection for the primer and concrete bridge piers.

[0047] In addition, the elastic polyurethane resin added in the embodiment of the present invention has good resistance to ultraviolet radiation and can be used for a long time in the strong ultraviolet environment in the northwest region without aging, so that the topcoat has both wear resistance, wind resistance and resistance to strong ultraviolet radiation, thereby improving the overall protective performance of the coating.

[0048] Although the present invention generally uses terms such as concrete bridge pier anti-corrosion and anti-cracking elastic anti-wind and sand coating, concrete bridge pier protective coating, three-component epoxy mortar self-repairing coating, two-component organic-inorganic hybrid elastic polyurethane coating, primer, topcoat, primer component A, primer component B, primer component C, topcoat component A, topcoat component B, modified epoxy resin liquid, additive, solvent, modified amine curing agent, self-repairing elastic cement mortar capsule, elastic polyurethane resin, modified inorganic silicon carbide wear-resistant ceramic particles, filler, HDI curing agent, shell layer, core layer, polymer elastic nano rubber particles, solid surfactant, coupling agent, active diluent, elastic microsphere powder liquid, self-repairing function, wear and sand resistance, strong ultraviolet radiation resistance, single packaging, high-speed dispersion, magnetic rotor dispersion, etc., the use of other terms is not excluded. The use of these terms is only for the purpose of more conveniently describing and explaining the essence of the present invention; interpreting them as any additional limitations is contrary to the spirit of the present invention.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A concrete bridge pier anti-corrosion, anti-cracking, elastic and anti-sandstorm coating, characterized by: Includes primer and topcoat; The primer is a three-component epoxy mortar self-repairing coating, including primer A component, primer B component and primer C component; The raw materials of the primer component A include modified epoxy resin liquid, additives and solvents; The primer component B includes a modified amine curing agent; The primer C component includes self-repairing elastic cement mortar capsules; The primer component A, primer component B and primer component C are compounded in a weight ratio of (4-6): (1-3): (6-10); The topcoat is a two-component organic-inorganic hybrid elastic polyurethane coating, comprising a topcoat component A and a topcoat component B; The raw materials of the topcoat component A include elastic polyurethane resin and modified inorganic silicon carbide wear-resistant ceramic particles in a weight ratio of (5-16): (3-6), and also include fillers, additives and solvents; The topcoat component B includes an HDI curing agent; The topcoat component A and topcoat component B are compounded in a weight ratio of (6-10):

1.

2. The concrete bridge pier anti-corrosion, anti-cracking, elastic and anti-wind and sand coating according to claim 1 is characterized in that: The distribution ratio of each group is as follows: Primer component A: 20~40 parts of modified epoxy resin liquid 1~5 parts of additives 2~4 parts solvent Primer component B: 5-10 parts of modified amine curing agent Primer C component: 40~60 parts of self-repairing elastic cement mortar capsules Topcoat component A: 40~80 parts of elastic polyurethane resin 15-30 parts of modified inorganic silicon carbide wear-resistant ceramic particles 10~20 parts of filler 2~6 parts of additives 3~10 parts solvent Topcoat component B: 8-15 parts of HDI curing agent.

3. The anti-corrosion, anti-cracking, elastic and anti-wind and sand coating for concrete bridge piers according to claim 2 is characterized by: The raw materials of the modified epoxy resin liquid include any one or more of E51 resin and E44 resin and a reactive diluent.

4. The anti-corrosion, anti-cracking, elastic and anti-wind and sand coating for concrete bridge piers according to claim 2 is characterized by: The self-repairing elastic cement mortar capsule consists of a shell layer and a core layer; Wherein, the shell layer comprises polymer elastic nano rubber particles; the polymer elastic nano rubber particles are any one or more of nitrile rubber, acrylic rubber, silicone rubber elastomer and acrylic elastomer; The core layer comprises modified nano calcium carbonate, wollastonite powder, cement and solid surfactant.

5. The concrete bridge pier anti-corrosion, anti-cracking, elastic and anti-wind and sand coating according to claim 2 is characterized by: The raw materials of the modified inorganic silicon carbide wear-resistant ceramic particles include inorganic silicon carbide particles and a coupling agent.

6. The anti-corrosion, anti-cracking, elastic and anti-wind and sand coating for concrete bridge piers according to claim 2, characterized in that: The elastic polyurethane resin is any one or more of acrylic modified polyurethane resin, polyester resin and polyether resin; The auxiliary agent is any one or more of BYK-203, BYK-220s, EFKA4010, EFKA4665, BYK-A530, BYK-331 and Tego-415; The solvent is any one or more of xylene, n-butanol, butyl acetate, propylene glycol methyl ether acetate, isopropyl alcohol and propylene glycol methyl ether; The filler is any one or more of precipitated barium sulfate, talc powder, feldspar powder and mica powder; The modified amine curing agent is any one or more of Sanmu T31, HENST H-1031A, Baisheng T31L and Shengquan CR231D; The HDI curing agent is any one or more of Bayer N3800, Bayer N3300, Asahi Kasei E405 and Wanhua HT-100.

7. A coating preparation method for preparing the concrete bridge pier anti-corrosion, anti-cracking, elastic and anti-wind and sand coating according to any one of claims 1 to 6, characterized in that: The following steps are involved: Preparation of primer: Add the modified epoxy resin liquid, additives and solvent into the reactor in sequence, and stir at 500-1000 rpm for 30-60 minutes to obtain the primer component A; Separately package the modified amine curing agent to obtain the primer component B; Separately pack the self-repairing elastic cement mortar capsules to obtain the primer C component; The primer component A, the primer component B, and the primer component C are mixed and evenly mixed in a weight ratio of (4-6): (1-3): (6-10) to obtain the concrete bridge pier anti-corrosion, anti-cracking, elastic, and anti-wind and sand coating primer; Preparation of topcoat: Add elastic polyurethane resin and modified inorganic silicon carbide wear-resistant ceramic particles into a reactor and stir at 600-1200 rpm for 40-70 min to obtain an organic-inorganic hybrid elastic polyurethane resin liquid; Adding fillers, additives and solvents to the organic-inorganic hybrid elastic polyurethane resin solution in sequence, and dispersing at high speed for 40 to 80 minutes to obtain topcoat component A; Separately package the HDI curing agent to obtain the topcoat component B; The topcoat component A and the topcoat component B are mixed and evenly stirred in a weight ratio of (6-10):1 to obtain the concrete bridge pier anti-corrosion, anti-cracking, elastic and anti-wind and sand coating topcoat.

8. The coating preparation method according to claim 7, characterized in that: The modified epoxy resin liquid is prepared by the following steps: Epoxy resin and plasticizer are added to a container in a weight ratio of (2-8):1 to obtain a mixed solution, and then 5%-7% by weight of a reactive diluent and 3%-4% by weight of a coupling agent are added to the mixed solution. The mixture is dispersed by a magnetic rotor for 8-15 minutes, heated to reflux temperature, kept warm for 1.5-2.5 hours, cooled and discharged to obtain the modified epoxy resin liquid.

9. The coating preparation method according to claim 7, characterized in that: The self-repairing elastic cement mortar capsule is prepared by the following steps: Add 10-20 parts by weight of polymer elastic nano rubber particles to 50-80 parts by weight of an organic solvent, heat to 80-100°C, keep warm for 30-60 minutes, and stir until completely dissolved to obtain a shell solution; Nano-calcium carbonate, wollastonite powder, cement and solid surfactant are mixed in a weight ratio of (1-3): (0.5-1.5): (5-8): (0.5-1) to obtain a core layer mixture; Under stirring conditions, the core layer mixture is slowly added to the shell layer solution to form an elastic microsphere powder liquid, and the elastic microsphere powder liquid is then dispersed at high speed for 36 to 60 hours; The dispersed elastic microsphere powder liquid is filtered through a filter, and the filtrate is washed with anhydrous ethanol 2 to 3 times, and dried at 60 to 80° C. for 12 to 24 hours to obtain the self-repairing elastic cement mortar capsule.

10. The coating preparation method according to claim 7, characterized in that: The modified inorganic silicon carbide wear-resistant ceramic particles are prepared by the following steps: Dilute with anhydrous ethanol to obtain a 1% fluorosilane solution; Add 50-80 parts by weight of silicon carbide particles to 200-300 parts by weight of 1% fluorosilane solution, then add 2-5 parts by weight of coupling agent, and stir at 60-90°C and 300-600 rpm for 2-4 hours. After the reaction is completed, the solution is filtered to obtain particles, which are washed with ethanol 2-3 times and dried at 80-100° C. for 8-12 h to obtain the modified inorganic silicon carbide wear-resistant ceramic particles.

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