An impact-resistant and abrasion-resistant hydraulic concrete water-based anticorrosive coating, a preparation method thereof, and a coating layer

Abstract

The application discloses an anti-impact and anti-abrasion hydraulic concrete water-based anticorrosive coating, a preparation method thereof and a coating. The raw materials of the anti-impact and anti-abrasion hydraulic concrete water-based anticorrosive coating include, in parts by weight, 10-40 parts of a water-based epoxy resin emulsion, 10-40 parts of modified steel slag powder, 10-50 parts of an alkaline regulating agent and 10-40 parts of a water-based epoxy curing agent. On the basis of the high abrasion resistance of the steel slag, the modified steel slag powder with higher strength and higher toughness is obtained through modification, and the modified filler of the alkaline regulating agent cooperates with the epoxy component, so that the poor combination of the epoxy coating and the inorganic filler can be significantly improved, and the anti-impact and anti-abrasion capacity of the epoxy coating can be improved. The steel slag raw material adopted by the application is a solid waste, has low cost and a wide source, and the modification process of the steel slag is short and simple.

Description

Technical Field

[0001] This invention relates to the field of anti-corrosion coatings for reinforced concrete, and more particularly to an anti-erosion water-based anti-corrosion coating for hydraulic concrete, its preparation method, and the coating itself. Background Technology

[0002] Hydraulic concrete structures are prone to defects such as cracking and spalling during use due to high-speed water erosion and cavitation. These defects compromise the overall structural stability, accelerate the corrosion of internal steel reinforcement, pose significant safety hazards, and result in high maintenance costs. Coating protection is the most widely used method to extend the service life of hydraulic concrete structures, as it is simple to apply and inexpensive. Traditional coatings mainly consist of organic and inorganic components. Organic coatings form dense films, offer good protection, and have strong adhesion to the concrete substrate, but suffer from poor weather resistance and are prone to blistering when internal moisture evaporates. Inorganic coatings offer good weather resistance but are brittle and prone to cracking. Furthermore, existing protective coatings are rarely designed with abrasion resistance in mind, making them unable to withstand high-speed water erosion and susceptible to damage and peeling.

[0003] Steel slag is a bulk solid waste product generated during steel smelting, converter, electric furnace, and continuous casting processes. The main mineral phases of steel slag include tricalcium silicate, dicalcium silicate, calcium magnesium olivine, calcium magnesium rhodochrosite, and calcium aluminoferrite, typically exhibiting high hardness, high temperature resistance, corrosion resistance, and high carbonization activity. Chinese invention patent CN201710464395.4 discloses a wear-resistant coating made from steel slag, a wear-resistant coating block, and a preparation method. This invention's wear-resistant coating is made from raw steel slag, epoxy resin, and a curing agent, wherein the steel slag particle size is in the range of 1-1.5 mm and 3-3.5 mm. This invention mainly improves wear resistance by using raw steel slag as a filler and through particle size distribution. However, it suffers from the problem of desorption between the steel slag and the two phases due to epoxy resin curing shrinkage, failing to fully utilize the high hardness and impact resistance of the steel slag.

[0004] Therefore, developing new anti-corrosion coatings for hydraulic concrete with high weather resistance, high bonding strength, and high abrasion resistance has significant practical and economic value. Summary of the Invention

[0005] The purpose of this invention is to overcome the above-mentioned technical deficiencies and to propose an anti-erosion water-based anti-corrosion coating for hydraulic concrete, its preparation method and coating, thereby solving the technical problem that the bonding strength and anti-erosion performance of wear-resistant coatings based on steel slag in the prior art need to be improved.

[0006] In a first aspect, the present invention provides an anti-erosion waterborne anti-corrosion coating for hydraulic concrete, wherein the raw materials, by weight, include: 10-40 parts of waterborne epoxy resin emulsion, 10-40 parts of modified steel slag powder, 10-50 parts of alkaline regulator, and 10-40 parts of waterborne epoxy curing agent.

[0007] Secondly, the present invention provides a method for preparing an anti-erosion water-based anti-corrosion coating for hydraulic concrete, comprising the following steps:

[0008] A water-based epoxy resin emulsion, modified steel slag powder, water-based epoxy curing agent, and alkaline regulator are mixed evenly to obtain an anti-erosion water-based coating for hydraulic concrete.

[0009] Thirdly, the present invention provides an anti-erosion water-based anti-corrosion coating for hydraulic concrete, which is obtained by applying the anti-erosion water-based anti-corrosion coating for hydraulic concrete provided in the first aspect of the present invention to the surface of a substrate and drying it.

[0010] Compared with the prior art, the beneficial effects of this application include:

[0011] This invention relates to an anti-abrasion water-based anti-corrosion coating for hydraulic concrete. Based on the high abrasion resistance of steel slag, modified steel slag powder with higher strength and toughness is obtained through modification. This modified steel slag powder, synergistically used with an alkaline regulator as a modified filler in the epoxy component, significantly improves the poor bonding between epoxy coatings and inorganic fillers, and enhances its abrasion resistance. The steel slag raw material used in this invention is solid waste, which is low in cost and widely available. The steel slag modification process is short and the preparation process is simple. Detailed Implementation

[0012] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0013] Existing wear-resistant coatings incorporate high-wear-resistant steel slag components within organic epoxy resins. They primarily utilize untreated steel slag particles to provide impact and abrasion resistance. However, the bond between the steel slag and epoxy resin is merely physical, resulting in a weak organic-inorganic combination. Under impact, the internal organic phase develops weak points, rendering the coating insufficiently resistant to impact and abrasion, failing to fully utilize the high hardness and impact resistance of the steel slag. Furthermore, the volume shrinkage during the curing and cross-linking process of the epoxy resin's organic components can easily lead to voids or shear stress between the coating and the substrate, weakening the coating's adhesion and protective performance. In contrast, water-based anti-corrosion coatings represent an important development direction due to their ease of application and low VOC emissions.

[0014] Based on this, the present invention is proposed.

[0015] In a first aspect, the present invention provides an anti-erosion waterborne anti-corrosion coating for hydraulic concrete, wherein the raw materials, by weight, include: 10-40 parts of waterborne epoxy resin emulsion, 10-40 parts of modified steel slag powder, 10-50 parts of alkaline regulator, and 10-40 parts of waterborne epoxy curing agent.

[0016] This invention relates to an anti-abrasion water-based anti-corrosion coating for hydraulic concrete. Based on the high abrasion resistance of steel slag, modified steel slag powder with higher strength and toughness is obtained through modification. This modified steel slag powder, synergistically used with an alkaline regulator as a modified filler in the epoxy component, significantly improves the poor bonding between epoxy coatings and inorganic fillers, and enhances its abrasion resistance. The steel slag raw material used in this invention is solid waste, which is low in cost and widely available. The steel slag modification process is short and the preparation process is simple.

[0017] In this embodiment, the preparation steps of modified steel slag powder include:

[0018] Steel slag, crystal control agent and water are mixed evenly, and then dried, ball-milled and sieved to obtain the undersize material;

[0019] The undersize material is subjected to carbonization modification to obtain modified steel slag powder.

[0020] This invention utilizes ball milling to increase the specific surface area and the number of surface-active groups in steel slag. Carbonization modification forms an aragonite-based high-toughness layer on the surface of the steel slag powder, thereby improving its strength and toughness. Furthermore, the ball milling and carbonization modification enhances the intercalation between the steel slag particles and the epoxy resin components, effectively resisting volume shrinkage during epoxy resin curing and thus improving the adhesion strength between the coating and the substrate.

[0021] Preferably, the crystal form control agent is at least one selected from magnesium chloride, magnesium sulfate, potassium chloride, and sodium phosphate. By adding a crystal form control agent, this invention can inhibit the formation of calcite during the carbonization modification process and induce the formation of an aragonite high-toughness layer on the surface of steel slag powder.

[0022] Preferably, the amount of crystal form control agent added accounts for 0.5% to 3% of the mass of steel slag, including but not limited to 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, etc.

[0023] Preferably, the amount of water added is 1 to 10 times the mass of the steel slag, including but not limited to 1, 2, 4, 6, 8, and 10 times.

[0024] Preferably, a mixer is used for mixing, and the mixing time is 1 to 2 hours.

[0025] Preferably, the drying temperature is 40–80°C and the drying time is 12–36 hours.

[0026] Preferably, ball milling is used, and the ball milling time is 0.5 to 1 hour.

[0027] Preferably, the sieve mesh size is 100 to 300 mesh.

[0028] Preferably, during the carbonization modification process, the humidity is 90%–95%, the temperature is 70–90°C, the gas pressure is 0.2–0.3 MPa, the carbonization time is 1–3 hours, and the volume concentration of CO2 gas is 40–100%. The carbonization modification process is carried out in a carbonization reaction vessel. By controlling the carbonization temperature at 70–90°C, this invention is more conducive to the formation of a high-toughness aragonite layer.

[0029] This invention does not limit the source of CO2 gas, and those skilled in the art can choose according to the actual situation. For example, the CO2 gas can be CO2-rich industrial kiln exhaust gas or commercial high-concentration CO2 gas, etc.

[0030] More preferably, during the carbonization modification process, the undersize material can be spread out to increase the contact area between the undersize material and CO2 gas, so as to make the carbonization more complete.

[0031] In this embodiment, the aqueous epoxy resin emulsion is a cationic aqueous epoxy resin emulsion. This invention does not limit the type of cationic aqueous epoxy resin emulsion; those skilled in the art can select it according to the actual situation. For example, it can be an amine-modified cationic aqueous epoxy resin emulsion, or further, a diethanolamine-modified cationic aqueous epoxy resin emulsion, a diallylamine-modified cationic aqueous epoxy resin emulsion, etc.

[0032] In some specific embodiments of the present invention, the preparation method of amine-modified cationic waterborne epoxy resin emulsion includes: dissolving E-44 epoxy resin in methyl ethyl ketone, heating to 70-80°C in a nitrogen atmosphere, stirring until the resin is completely dissolved, adding 9-11 parts of amine compound, continuing the reaction for 1-2 hours, cooling down, adding acrylic acid under stirring until the pH is 5-6, and finally adding deionized water to dilute to the target solid content to obtain cationic waterborne epoxy resin emulsion.

[0033] In this embodiment, the solid content of the waterborne epoxy resin emulsion is 30-60%, including but not limited to 30%, 40%, 50%, 60%, etc.

[0034] In this embodiment, the curing agent is at least one of 8310 self-emulsifying epoxy curing agent, GCA02 waterborne epoxy curing agent, and 810 curing agent.

[0035] In this embodiment, the alkaline regulator is dicalcium silicate mineral, more specifically at least one of γ-type dicalcium silicate and β-type dicalcium silicate, preferably γ-type dicalcium silicate. Dicalcium silicate mineral typically lacks hydration activity, but upon combining with water, it rapidly releases calcium hydroxide, maintaining a highly alkaline environment of approximately pH 12 for a relatively long period. When compounded with waterborne epoxy resin, the high alkalinity further promotes demulsification of the waterborne epoxy resin. Compared to the demulsification process of cement-polymer emulsions, accelerating the demulsification process using the alkaline regulator of this invention is more gentle, resulting in a tighter bond between the organic demulsification film and the inorganic material, preventing rapid demulsification and organic particle agglomeration.

[0036] In this embodiment, the water-based anti-corrosion coating for erosion-resistant hydraulic concrete comprises, by weight, 20 parts of water-based epoxy resin emulsion, 10-40 parts of modified steel slag powder, 10-30 parts of alkaline regulator, and 20 parts of water-based epoxy curing agent.

[0037] In this embodiment, the raw materials of the water-based anti-corrosion coating for erosion-resistant hydraulic concrete also include: a diluent.

[0038] Preferably, the diluent is at least one of anhydrous ethanol, ethylene glycol, propylene glycol, and isopropanol.

[0039] Preferably, the amount of diluent added accounts for 0.05% to 5% of the total mass of the water-based anti-corrosion coating for erosion-resistant hydraulic concrete, including but not limited to 0.05%, 0.1%, 0.5%, 1%, 2%, 3%, 4%, 5%, etc.

[0040] Secondly, the present invention provides a method for preparing an anti-erosion water-based anti-corrosion coating for hydraulic concrete, comprising the following steps:

[0041] A water-based epoxy resin emulsion, modified steel slag powder, water-based epoxy curing agent, and alkaline regulator are mixed evenly to obtain an anti-erosion water-based coating for hydraulic concrete.

[0042] In some specific embodiments of the present invention, the preparation method of the water-based anti-corrosion coating for erosion-resistant hydraulic concrete includes the following steps:

[0043] A component A is obtained by uniformly mixing waterborne epoxy resin emulsion and modified steel slag powder.

[0044] The water-based epoxy curing agent and the alkaline regulator are mixed evenly to obtain component B;

[0045] Mix component A and component B evenly to obtain a water-based anti-corrosion coating for erosion-resistant hydraulic concrete.

[0046] Thirdly, the present invention provides an anti-erosion water-based anti-corrosion coating for hydraulic concrete, which is obtained by applying the anti-erosion water-based anti-corrosion coating for hydraulic concrete provided in the first aspect of the present invention to the surface of a substrate and drying it.

[0047] In this embodiment, the substrate is concrete.

[0048] In this embodiment, the substrate needs to be pretreated before coating.

[0049] In some specific embodiments of the present invention, the substrate pretreatment steps include: removing defects and damaged parts from the concrete surface, removing surface dust and debris with high-pressure water, and then drying the concrete.

[0050] In this embodiment, the coating step includes: applying the above-mentioned anti-abrasion water-based anti-corrosion coating for hydraulic concrete to the concrete surface using a brush roller.

[0051] Preferably, apply 2 to 3 coats.

[0052] In this embodiment, the coating thickness is 0.5 to 3 mm, preferably 1 to 1.5 mm.

[0053] In this embodiment, the drying method is natural drying, and the drying time is 12 to 36 hours.

[0054] To avoid redundancy, the preparation methods of the amine-modified cationic aqueous epoxy resin emulsion in the following embodiments and comparative examples of the present invention are as follows:

[0055] Preparation of diethanolamine-modified cationic waterborne epoxy resin emulsion: 10 parts of E-44 epoxy resin (80% solid content by weight) were dissolved in 20 parts of butanone. The solution was heated to 80°C under nitrogen atmosphere and stirred until the resin was completely dissolved. 11 parts of diethanolamine were added, and the reaction was continued for 1 hour. The product was then cooled to 40°C, and acrylic acid was added under stirring until the pH reached 5.5. Deionized water was added to dilute the solution to a solid content of 40%, thus obtaining the diethanolamine-modified cationic waterborne epoxy resin emulsion.

[0056] Preparation of diallylamine-modified cationic waterborne epoxy resin emulsion: 10 parts of E-44 epoxy resin (80% solid content by mass) were dissolved in 20 parts of butanone. The solution was heated to 70°C under nitrogen atmosphere and stirred until the resin was completely dissolved. 9 parts of diallylamine were added, and the reaction was continued for 1 hour. The product was then cooled to 40°C, and acrylic acid was added under stirring until the pH reached 5.5. Deionized water was added to dilute the solution to a solid content of 40%, thus obtaining the diallylamine-modified cationic waterborne epoxy resin emulsion.

[0057] Example 1

[0058] The preparation steps of the water-based anti-corrosion coating for erosion-resistant hydraulic concrete in this embodiment are as follows:

[0059] (1) Weigh 300 parts of raw steel slag, 5 parts of magnesium chloride crystal form control agent and 1000 parts of water by weight and add them to the mixer and mix for 2 hours. After mixing, put them in a 60℃ oven to dry for 24 hours, and then put them in a ball mill to grind for 0.5 hours.

[0060] (2) Pass the ground powder through a 200-mesh sieve to obtain sieved steel slag powder. Spread the sieved powder out and place it in a CO2 pressure tank. Control the humidity of the pressure tank to 95%. Heat it to 90°C using a thermocouple. Introduce high-concentration CO2 gas with a volume concentration of 99.9% to a pressure of 0.2 MPa. Modify for 2 hours to obtain modified steel slag powder. Take it out for later use.

[0061] (3) Take 10 parts of the above modified steel slag powder as the coating modification component by weight, add it to 20 parts of diethanolamine modified cationic waterborne epoxy resin emulsion and stir evenly to obtain component A.

[0062] (4) Take 30 parts by weight of γ-type dicalcium silicate mineral, add 20 parts of GCA02 waterborne epoxy curing agent and stir evenly to obtain component B.

[0063] (5) Mix the above components A and B evenly, add 1 part of isopropanol diluent, mix thoroughly, and obtain the finished coating.

[0064] (6) Remove defects and damaged parts from the concrete surface, remove surface dust and debris with high pressure water, and after the concrete surface is dry, use a brush roller to evenly apply the above coating to the concrete surface, apply 2 to 3 coats, and control the coating thickness to 1 to 1.5 mm.

[0065] (7) Place the components in the air to dry naturally for 24 hours.

[0066] Example 2

[0067] The preparation steps of the water-based anti-corrosion coating for erosion-resistant hydraulic concrete in this embodiment are as follows:

[0068] (1) Weigh 300 parts of raw steel slag, 2 parts of magnesium chloride crystal form control agent and 1000 parts of water by weight and add them to the mixer and mix for 2 hours. After mixing, put them in a 60℃ oven to dry for 24 hours, and then put them in a ball mill to grind for 0.5 hours.

[0069] (2) Pass the ground powder through a 200-mesh sieve to obtain sieved steel slag powder. Spread the sieved powder out and place it in a CO2 pressure tank. Control the humidity of the pressure tank to 95%. Heat it to 90°C using a thermocouple. Introduce high-concentration CO2 gas with a volume concentration of 99.9% to a pressure of 0.2 MPa. Modify for 2 hours to obtain modified steel slag powder. Take it out for later use.

[0070] (3) Take 10 parts of the above modified steel slag powder as the coating modification component by weight, add it to 20 parts of diethanolamine modified cationic waterborne epoxy resin emulsion and stir evenly to obtain component A.

[0071] (4) Take 30 parts by weight of γ-type dicalcium silicate mineral, add 20 parts of GCA02 waterborne epoxy curing agent and stir evenly to obtain component B.

[0072] (5) Mix the above components A and B evenly, add 1 part of isopropanol diluent, mix thoroughly, and obtain the finished coating.

[0073] (6) Remove defects and damaged parts from the concrete surface, remove surface dust and debris with high pressure water, and after the concrete surface is dry, use a brush roller to evenly apply the above coating to the concrete surface, apply 2 to 3 coats, and control the coating thickness to 1 to 1.5 mm.

[0074] (7) Place the components in the air to dry naturally for 24 hours.

[0075] Example 3

[0076] The preparation steps of the water-based anti-corrosion coating for erosion-resistant hydraulic concrete in this embodiment are as follows:

[0077] (1) Weigh 300 parts of raw steel slag, 8 parts of magnesium chloride crystal form control agent and 1000 parts of water by weight and add them to the mixer and mix for 2 hours. After mixing, put them in a 60℃ oven to dry for 24 hours, and then put them in a ball mill to grind for 0.5 hours.

[0078] (2) Pass the ground powder through a 200-mesh sieve to obtain sieved steel slag powder. Spread the sieved powder out and place it in a CO2 pressure tank. Control the humidity of the pressure tank to 95%. Heat it to 90°C using a thermocouple. Introduce high-concentration CO2 gas with a volume concentration of 99.9% to a pressure of 0.2 MPa. Modify for 2 hours to obtain modified steel slag powder. Take it out for later use.

[0079] (3) Take 10 parts of the above modified steel slag powder as the coating modification component by weight, add it to 20 parts of diethanolamine modified cationic waterborne epoxy resin emulsion and stir evenly to obtain component A.

[0080] (4) Take 30 parts by weight of γ-type dicalcium silicate mineral, add 20 parts of GCA02 waterborne epoxy curing agent and stir evenly to obtain component B.

[0081] (5) Mix the above components A and B evenly, add 1 part of isopropanol diluent, mix thoroughly, and obtain the finished coating.

[0082] (6) Remove defects and damaged parts from the concrete surface, remove surface dust and debris with high pressure water, and after the concrete surface is dry, use a brush roller to evenly apply the above coating to the concrete surface, apply 2 to 3 coats, and control the coating thickness to 1 to 1.5 mm.

[0083] (7) Place the components in the air to dry naturally for 24 hours.

[0084] Example 4

[0085] The preparation steps of the water-based anti-corrosion coating for erosion-resistant hydraulic concrete in this embodiment are as follows:

[0086] (1) Weigh 300 parts of raw steel slag, 5 parts of magnesium sulfate crystal form control agent and 1000 parts of water by weight and add them to the mixer and mix for 2 hours. After mixing, put them in a 60℃ oven to dry for 24 hours and then put them in a ball mill to grind for 0.5 hours.

[0087] (2) Pass the ground powder through a 200-mesh sieve to obtain the sieved steel slag powder. Spread the sieved powder out and place it in a CO2 pressure tank. Control the humidity of the pressure tank to 95%. Heat it to 90°C using a thermocouple. Introduce high-concentration CO2 gas with a volume concentration of 99.9% to a pressure of 0.2 MPa. Modify for 2 hours to obtain modified steel slag powder. Take it out for later use.

[0088] (3) Take 10 parts of the above modified steel slag powder as the coating modification component by weight, add it to 20 parts of diallylamine modified cationic waterborne epoxy resin emulsion and stir evenly to obtain component A.

[0089] (4) Take 30 parts by weight of γ-type dicalcium silicate mineral, add 20 parts of GCA02 waterborne epoxy curing agent and stir evenly to obtain component B.

[0090] (5) Mix the above components A and B evenly, add 1 part of isopropanol diluent, mix thoroughly, and obtain the finished coating.

[0091] (6) Remove defects and damaged parts from the concrete surface, remove surface dust and debris with high pressure water, and after the concrete surface is dry, use a brush roller to evenly apply the above coating to the concrete surface, apply 2 to 3 coats, and control the coating thickness to 1 to 1.5 mm.

[0092] (7) Place the components in the air to dry naturally for 24 hours.

[0093] Example 5

[0094] The preparation steps of the water-based anti-corrosion coating for erosion-resistant hydraulic concrete in this embodiment are as follows:

[0095] (1) Weigh 300 parts of raw steel slag, 9 parts of magnesium sulfate crystal form control agent and 3000 parts of water by weight and add them to the mixer and mix for 1 hour. After mixing, put them in an 80℃ oven to dry for 36 hours and then put them in a ball mill to grind for 1 hour.

[0096] (2) Pass the ground powder through a 200-mesh sieve to obtain sieved steel slag powder. Spread the sieved powder out and place it in a CO2 pressure tank. Control the humidity of the pressure tank to 95%. Heat it to 90°C using a thermocouple. Introduce high-concentration CO2 gas with a volume concentration of 99.9% to a pressure of 0.2 MPa. Modify for 2 hours to obtain modified steel slag powder. Take it out for later use.

[0097] (3) Take 10 parts of the above modified steel slag powder as the coating modification component by weight, add it to 20 parts of diethanolamine modified cationic waterborne epoxy resin emulsion and stir evenly to obtain component A.

[0098] (4) Take 10 parts by weight of γ-type dicalcium silicate mineral, add 20 parts of GCA02 waterborne epoxy curing agent and stir evenly to obtain component B.

[0099] (5) Mix the above components A and B evenly, add 2 parts of isopropanol diluent, mix thoroughly, and obtain the finished coating.

[0100] (6) Remove defects and damaged parts from the concrete surface, remove surface dust and debris with high pressure water, and after the concrete surface is dry, use a brush roller to evenly apply the above coating to the concrete surface, apply 2 to 3 coats, and control the coating thickness to 1 to 1.5 mm.

[0101] (7) Place the components in the air to dry naturally for 24 hours.

[0102] Example 6

[0103] The preparation steps of the water-based anti-corrosion coating for erosion-resistant hydraulic concrete in this embodiment are as follows:

[0104] (1) Weigh 300 parts of raw steel slag, 8 parts of potassium chloride crystal form control agent and 600 parts of water by weight and add them to the mixer and mix for 2 hours. After the mixture is fully mixed, put it in a 60℃ oven to dry for 24 hours and then put it in a ball mill to grind for 1 hour.

[0105] (2) Pass the ground powder through a 200-mesh sieve to obtain sieved steel slag powder. Spread the sieved powder out and place it in a CO2 pressure tank. Control the humidity of the pressure tank to 95%. Heat it to 90°C using a thermocouple. Introduce high-concentration CO2 gas with a volume concentration of 99.9% to a pressure of 0.2 MPa. Modify for 2 hours to obtain modified steel slag powder. Take it out for later use.

[0106] (3) Take 40 parts of the above modified steel slag powder as the coating modification component by weight, add it to 20 parts of diethanolamine modified cationic waterborne epoxy resin emulsion and stir evenly to obtain component A.

[0107] (4) Take 30 parts by weight of γ-type dicalcium silicate mineral, add 20 parts of GCA02 waterborne epoxy curing agent and stir evenly to obtain component B.

[0108] (5) Mix the above components A and B evenly, add 1 part of isopropanol diluent, mix thoroughly, and obtain the finished coating.

[0109] (6) Remove defects and damaged parts from the concrete surface, remove surface dust and debris with high pressure water, and after the concrete surface is dry, use a brush roller to evenly apply the above coating to the concrete surface, apply 2 to 3 coats, and control the coating thickness to 1 to 1.5 mm.

[0110] (7) Place the components in the air to dry naturally for 24 hours.

[0111] Example 7

[0112] The preparation steps of the water-based anti-corrosion coating for erosion-resistant hydraulic concrete in this embodiment are as follows:

[0113] (1) Weigh 300 parts of raw steel slag, 5 parts of magnesium chloride crystal form control agent and 1000 parts of water by weight and add them to the mixer and mix for 2 hours. After mixing, put them in a 60℃ oven to dry for 24 hours, and then put them in a ball mill to grind for 0.5 hours.

[0114] (2) Pass the ground powder through a 200-mesh sieve to obtain sieved steel slag powder. Spread the sieved powder out and place it in a CO2 pressure tank. Control the humidity of the pressure tank to 95%. Heat it to 90°C using a thermocouple. Introduce high-concentration CO2 gas with a volume concentration of 99.9% to a pressure of 0.2 MPa. Modify for 2 hours to obtain modified steel slag powder. Take it out for later use.

[0115] (3) Take 10 parts of the above modified steel slag powder as the coating modification component by weight, add it to 20 parts of diethanolamine modified cationic waterborne epoxy resin emulsion and stir evenly to obtain component A.

[0116] (4) Take 30 parts by weight of β-type dicalcium silicate mineral, add 20 parts of GCA02 waterborne epoxy curing agent and stir evenly to obtain component B.

[0117] (5) Mix the above components A and B evenly, add 1 part of isopropanol diluent, mix thoroughly, and obtain the finished coating.

[0118] (6) Remove defects and damaged parts from the concrete surface, remove surface dust and debris with high pressure water, and after the concrete surface is dry, use a brush roller to evenly apply the above coating to the concrete surface, apply 2 to 3 coats, and control the coating thickness to 1 to 1.5 mm.

[0119] (7) Place the components in the air to dry naturally for 24 hours.

[0120] Comparative Example 1

[0121] In step (2) of Comparative Example 1, the steel slag powder was not modified, and other conditions and steps were the same as in Example 1, as follows:

[0122] (1) Weigh 300 parts of raw steel slag, 5 parts of magnesium chloride crystal form control agent and 1000 parts of water according to the weight ratio and add them to the mixer and mix for 2 hours. After the mixture is fully mixed, put it in a 60℃ oven to dry for 24 hours, and then put it in a ball mill to grind for 0.5 hours.

[0123] (2) Pass the ground powder through a 200-mesh sieve to obtain the sieved steel slag powder, and take it out for later use.

[0124] (3) Take 10 parts of the above-mentioned sieved steel slag powder as the coating modification component by weight, add it to 20 parts of diethanolamine modified cationic waterborne epoxy resin emulsion and stir evenly to obtain component A.

[0125] (4) Take 30 parts by weight of γ-type dicalcium silicate mineral, add 20 parts of GCA02 waterborne epoxy curing agent and stir evenly to obtain component B.

[0126] (5) Mix the above components A and B evenly, add 1 part of isopropanol diluent, mix thoroughly, and obtain the finished coating.

[0127] (6) Remove defects and damaged parts from the concrete surface, remove surface dust and debris with high pressure water, and after the concrete surface is dry, use a brush roller to evenly apply the above coating to the concrete surface, apply 2 to 3 coats, and control the coating thickness to 1 to 1.5 mm.

[0128] (7) Place the components in the air to dry naturally for 24 hours.

[0129] Comparative Example 2

[0130] In Comparative Example 2, no magnesium chloride crystal form control agent was added in step (1), and the other conditions and steps were the same as in Example 1, as follows:

[0131] (1) Weigh 300 parts of raw steel slag and 1000 parts of water by weight and add them to the mixer and mix for 2 hours. After mixing, dry in a 60°C oven for 24 hours and then grind in a ball mill for 0.5 hours.

[0132] (2) Pass the ground powder through a 200-mesh sieve to obtain sieved steel slag powder. Spread the sieved powder out and place it in a CO2 pressure tank. Control the humidity of the pressure tank to 95%. Heat it to 90°C using a thermocouple. Introduce high-concentration CO2 gas with a volume concentration of 99.9% to a pressure of 0.2 MPa. Modify for 2 hours to obtain modified steel slag powder. Take it out for later use.

[0133] (3) Take 10 parts of the above modified steel slag powder as the coating modification component by weight, add it to 20 parts of diethanolamine modified cationic waterborne epoxy resin emulsion and stir evenly to obtain component A.

[0134] (4) Take 30 parts by weight of γ-type dicalcium silicate mineral, add 20 parts of GCA02 waterborne epoxy curing agent and stir evenly to obtain component B.

[0135] (5) Mix the above components A and B evenly, add 1 part of isopropanol diluent, mix thoroughly, and obtain the finished coating.

[0136] (6) Remove defects and damaged parts from the concrete surface, remove surface dust and debris with high pressure water, and after the concrete surface is dry, use a brush roller to evenly apply the above coating to the concrete surface, apply 2 to 3 coats, and control the coating thickness to 1 to 1.5 mm.

[0137] (7) Place the components in the air to dry naturally for 24 hours.

[0138] Comparative Example 3

[0139] In Comparative Example 3, no dicalcium silicate mineral was added in step (4), and the other conditions and steps were the same as in Example 1, as follows:

[0140] (1) Weigh 300 parts of raw steel slag, 5 parts of magnesium chloride crystal form control agent and 1000 parts of water by weight and add them to the mixer and mix for 2 hours. After mixing, put them in a 60℃ oven to dry for 24 hours, and then put them in a ball mill to grind for 0.5 hours.

[0141] (2) Pass the ground powder through a 200-mesh sieve to obtain sieved steel slag powder. Spread the sieved powder out and place it in a CO2 pressure tank. Control the humidity of the pressure tank to 95%. Heat it to 90°C using a thermocouple. Introduce high-concentration CO2 gas with a volume concentration of 99.9% to a pressure of 0.2 MPa. Modify for 2 hours to obtain modified steel slag powder. Take it out for later use.

[0142] (3) Take 10 parts of the above modified steel slag powder as the coating modification component by weight, add it to 20 parts of diethanolamine modified cationic waterborne epoxy resin emulsion and stir evenly to obtain component A.

[0143] (4) Take 20 parts of GCA02 waterborne epoxy curing agent as component B by weight.

[0144] (5) Mix the above components A and B evenly, add 1 part of isopropanol diluent, mix thoroughly, and obtain the finished coating.

[0145] (6) Remove defects and damaged parts from the concrete surface, remove surface dust and debris with high pressure water, and after the concrete surface is dry, use a brush roller to evenly apply the above coating to the concrete surface, apply 2 to 3 coats, and control the coating thickness to 1 to 1.5 mm.

[0146] (7) Place the components in the air to dry naturally for 24 hours.

[0147] Comparative Example 4

[0148] In step (4) of Comparative Example 4, the alkalinity control agent was ordinary Portland cement, and the other conditions and steps were the same as in Example 1, as follows:

[0149] (1) Weigh 300 parts of raw steel slag, 5 parts of magnesium chloride crystal form control agent and 1000 parts of water by weight and add them to the mixer and mix for 2 hours. After mixing, put them in a 60℃ oven to dry for 24 hours, and then put them in a ball mill to grind for 0.5 hours.

[0150] (2) Pass the ground powder through a 200-mesh sieve to obtain sieved steel slag powder. Spread the sieved powder out and place it in a CO2 pressure tank. Control the humidity of the pressure tank to 95%. Heat it to 90°C using a thermocouple. Introduce high-concentration CO2 gas with a volume concentration of 99.9% to a pressure of 0.2 MPa. Modify for 2 hours to obtain modified steel slag powder. Take it out for later use.

[0151] (3) Take 10 parts of the above modified steel slag powder as the coating modification component by weight, add it to 20 parts of diethanolamine modified cationic waterborne epoxy resin emulsion, stir evenly and let stand for 0.5h to obtain component A.

[0152] (4) Take 30 parts of ordinary silicate cement by weight, add 20 parts of GCA02 water-based epoxy curing agent and stir evenly to obtain component B.

[0153] (5) Mix the above components A and B evenly, add 1 part of isopropanol diluent, mix thoroughly, and obtain the finished coating.

[0154] (6) Remove defects and damaged parts from the concrete surface, remove surface dust and debris with high pressure water, and after the concrete surface is dry, use a brush roller to evenly apply the above coating to the concrete surface, apply 2 to 3 coats, and control the coating thickness to 1 to 1.5 mm.

[0155] (7) Place the components in the air to dry naturally for 24 hours.

[0156] experimental group

[0157] The impact and abrasion strength of Examples 1-7 and Comparative Examples 1-4 above were tested (underwater steel ball method) with a rotation speed of 1500 r / min for 72 hours, referring to the industry standard DL / T 5150-2020 "Test Procedure for Hydraulic Concrete".

[0158] The adhesion of Examples 1-7 and Comparative Examples 1-4 above was tested by pull-off method, referring to GB / T5210 "Paints and Varnishes - Pull-off Adhesion Test".

[0159] The test results are shown in Table 1.

[0160] Table 1 Performance test results of Examples 1-7 and Comparative Examples 1-4

[0161]

[0162] As can be seen from Table 1, compared with Comparative Examples 1 to 7, the water-based anti-erosion coatings for hydraulic concrete prepared in Examples 1 to 4 of the present invention can effectively form coatings with higher erosion resistance and bonding strength, and are suitable for harsh erosion environments such as oceans and high-drop rivers. Moreover, the preparation process is simple and easy to apply.

[0163] The specific embodiments described above do not constitute a limitation on the scope of protection of this application. Any other corresponding changes and modifications made based on the technical concept of this application should be included within the scope of protection of the claims of this application.

Claims

1. A water-based anti-corrosion coating for erosion-resistant hydraulic concrete, characterized in that, By weight, the raw materials include: 10-40 parts of waterborne epoxy resin emulsion, 10-40 parts of modified steel slag powder, 10-50 parts of alkaline regulator, and 10-40 parts of waterborne epoxy curing agent; wherein, The preparation steps of the modified steel slag powder include: mixing steel slag, crystal form control agent and water evenly, then drying, ball milling and sieving to obtain undersize material; subjecting the undersize material to carbonization modification treatment to obtain modified steel slag powder; the crystal form control agent is at least one of magnesium chloride, magnesium sulfate, potassium chloride and sodium phosphate. The alkaline regulator is dicalcium silicate mineral.

2. The water-based anti-corrosion coating for erosion-resistant hydraulic concrete according to claim 1, characterized in that, The amount of the crystal form control agent added is 0.5-3% of the mass of the steel slag; and / or, The amount of water added is 1 to 10 times the mass of the steel slag; and / or, The sieve mesh size is 100–300 mesh; and / or, During the carbonization modification process, the humidity is 90%–95%, the temperature is 70–90℃, the gas pressure is 0.2–0.3MPa, the carbonization time is 1–3h, and the volume concentration of CO2 gas is 40–100%.

3. The water-based anti-corrosion coating for erosion-resistant hydraulic concrete according to claim 1, characterized in that, The aqueous epoxy resin emulsion is a cationic aqueous epoxy resin emulsion; and / or, The solid content of the aqueous epoxy resin emulsion is 30-60%; and / or, The curing agent is at least one of 8310 self-emulsifying epoxy curing agent, GCA02 waterborne epoxy curing agent, and 810 curing agent.

4. The water-based anti-corrosion coating for erosion-resistant hydraulic concrete according to claim 3, characterized in that, The aqueous epoxy resin emulsion is an amine-modified cationic aqueous epoxy resin emulsion; and / or, The alkaline regulator is at least one of γ-type dicalcium silicate and β-type dicalcium silicate.

5. The water-based anti-corrosion coating for erosion-resistant hydraulic concrete according to claim 1, characterized in that, By weight, its raw materials include: 20 parts of waterborne epoxy resin emulsion, 10-40 parts of modified steel slag powder, 10-30 parts of alkaline regulator, and 20 parts of waterborne epoxy curing agent.

6. The water-based anti-corrosion coating for erosion-resistant hydraulic concrete according to claim 1, characterized in that, The raw materials for the water-based anti-corrosion coating for erosion-resistant hydraulic concrete also include: a diluent; wherein, The diluent is at least one selected from anhydrous ethanol, ethylene glycol, propylene glycol, and isopropanol; and / or, The amount of the diluent added is 0.05 to 5% of the total mass of the water-based anti-corrosion coating for erosion-resistant hydraulic concrete.

7. A method for preparing an anti-erosion water-based anti-corrosion coating for hydraulic concrete as described in any one of claims 1 to 6, characterized in that, Includes the following steps: A water-based epoxy resin emulsion, modified steel slag powder, water-based epoxy curing agent, and alkaline regulator are mixed evenly to obtain an anti-erosion water-based coating for hydraulic concrete.

8. A water-based anti-corrosion coating for erosion-resistant hydraulic concrete, characterized in that, The anti-erosion hydraulic concrete water-based anti-corrosion coating is obtained by applying the anti-erosion hydraulic concrete water-based anti-corrosion coating of any one of claims 1 to 6 to the substrate surface and drying it.

9. The water-based anti-corrosion coating for erosion-resistant hydraulic concrete according to claim 8, characterized in that, The substrate is concrete; and / or, The thickness of the water-based anti-corrosion coating for the erosion-resistant hydraulic concrete is 0.5–3 mm and / or, The drying method is natural drying, and the drying time is 12 to 36 hours.

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