Water-based hybrid polyurea heavy anti-corrosion coating as well as preparation method and application thereof

Abstract

The invention discloses a water-based hybrid polyurea heavy anti-corrosion coating and a preparation method and application thereof.The water-based hybrid polyurea heavy anti-corrosion coating is obtained through a combined polycondensation reaction of polyisocyanate and an active emulsifier in the presence of an alkali metal salt aqueous solution, a compact molecular structure and a nanoscale closed barrier are generated in situ, the advantages of organic-inorganic composite materials are integrated, and the water-based hybrid polyurea heavy anti-corrosion coating has the advantages of being environmentally friendly and free of pollution. The paint has the advantages of extremely high adhesive force and mechanical strength, super-strong chemical resistance and corrosion resistance, excellent heat resistance, good constructability, zero VOC emission, environmental protection, safety, no toxicity and no odor, can be sprayed, brushed or rolled on the surfaces of steel, concrete and the like, can be applied to a single-layer or double-layer system, is labor-saving and time-saving, is suitable for corrosive atmosphere and soaking environment, and has a wide application prospect. The method is especially suitable for extreme conditions and areas requiring corrosion resistance and wear resistance, and comprises the fields of petrochemical engineering, ocean engineering, ships and naval vessels, infrastructures, energy traffic, mining smelting, water treatment facilities, food and medicine, papermaking printing and dyeing, OEM, buildings and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of anti-corrosion coatings, and in particular to a water-based hybrid polyurea heavy-duty anti-corrosion coating and a preparation method and application thereof. Background Art

[0002] Compared with ordinary anti-corrosion coatings, heavy-duty anti-corrosion coatings can be used in relatively harsh corrosive environments, and their durability is longer, reaching 15 years or even more than 25 years. Even in acid, alkali, salt and solvent media and under certain temperature conditions, they can be used for more than 5 years. The dry film thickness of ordinary anti-corrosion coatings is usually 100-200μm, while the dry film thickness of heavy-duty anti-corrosion coatings is more than 200-400μm, and even up to 2000μm. Heavy-duty anti-corrosion coatings are the most technically representative, influential and development-potential type of anti-corrosion coatings, and are also one of the important indicators for measuring the development level of a country's coatings industry.

[0003] With the rapid development of the global economy and industry, domestic environmental awareness has gradually increased. Relevant laws and regulations have made strict restrictions on the VOC content in heavy-duty anti-corrosion coatings. Green heavy-duty anti-corrosion coatings will usher in a new round of development opportunities. The development of low-VOC, high-performance water-based and solvent-free heavy-duty anti-corrosion coatings has become one of the current research hotspots.

[0004] Organic-inorganic hybrid polymers are new materials that have attracted much attention in recent years because they can chemically bond organic polymers and inorganic materials in a special structure and use their inherent properties to obtain unusual performance combinations. In general, the properties of organic-inorganic hybrid polymers are usually far superior to non-hybrid materials. For example, hybrid polyurea has higher chemical resistance, radiation resistance and thermal stability compared with epoxy or polyurethane. At present, water-based inorganic zinc silicate, water-based epoxy, water-based polyurethane, water-based fluorocarbon coatings and other products have been successfully developed. However, water-based anti-corrosion coatings are prone to flash corrosion, and their chemical resistance, corrosion resistance and mechanical properties are relatively poor. They cannot be used in severe corrosive environments and still need further improvement. Solvent-free epoxy coatings have excellent mechanical properties, chemical resistance and corrosion resistance, and a solid content of up to 100%, but they usually have a high viscosity and a short application period. In addition, many products contain benzyl alcohol, but benzyl alcohol is considered to be a source of volatile organic compounds.

[0005] In addition, the single function of heavy-duty anti-corrosion coatings can no longer meet the huge demand of the modern coatings industry, and it is imperative to diversify the functions of heavy-duty anti-corrosion coatings, such as high-temperature anti-corrosion coatings, conductive anti-corrosion coatings, intumescent fire-retardant coatings, self-healing anti-corrosion coatings, nano-composite coatings, fouling release coatings, and primer-and-surface all-in-one coatings.

[0006] Therefore, it is necessary to develop a green, high-performance heavy-duty anti-corrosion coating that is suitable for long-term protection of surfaces such as steel and concrete in corrosive atmospheres and immersion environments, especially in extreme conditions and areas requiring corrosion resistance and wear resistance, including petrochemicals, marine engineering, ships and vessels, infrastructure, energy transportation, mining and smelting, water treatment facilities, food and medicine, papermaking and printing, OEM, construction and other fields, to extend the service life of industrial facilities, reduce energy loss and VOC emissions, and ensure that they meet strict environmental protection requirements. Summary of the invention

[0007] Technical issues solved:

[0008] The purpose of the present invention is to overcome the technical problems existing in the prior art, such as high VOC content, easy flash corrosion, relatively poor chemical resistance, corrosion resistance and mechanical properties, high viscosity, short application period, and containing benzyl alcohol. The present application provides a water-based hybrid polyurea heavy anti-corrosion coating and its preparation method and application, which is obtained by the "joint polycondensation" reaction of polyisocyanate and active emulsifier in the presence of an alkali metal salt aqueous solution, in situ generating a dense molecular structure and a nano-scale closed barrier, integrating the advantages of organic-inorganic composite materials, having extremely high adhesion and mechanical strength, super chemical resistance and corrosion resistance, superior heat resistance, good construction performance, zero VOC emissions, environmentally friendly and safe, non-toxic and odorless, and can be sprayed, brushed or rolled on surfaces such as steel and concrete, a single-layer or double-layer system, saving labor and time, and is suitable for corrosive atmospheres and immersion environments, especially extreme conditions and areas requiring corrosion resistance and wear resistance, including petrochemicals, marine engineering, ships and warships, infrastructure, energy and transportation, mining and smelting, water treatment facilities, food and medicine, papermaking and printing, OEM, construction and other fields.

[0009] Technical solution:

[0010] To achieve the above objectives, this application is implemented through the following technical solutions:

[0011] A water-based hybrid polyurea heavy-duty anti-corrosion coating. The raw materials of the water-based hybrid polyurea heavy-duty anti-corrosion coating are calculated by weight: 39-48 parts of polyisocyanate, 31-38 parts of active emulsifier, 14-28 parts of alkali metal salt aqueous solution, 0-2 parts of pigment, and 0.5-3 parts of auxiliary agent.

[0012] Preferably, the raw materials of the water-based hybrid polyurea heavy-duty anti-corrosion coating are calculated by weight: 41-45 parts of polyisocyanate, 32-36 parts of active emulsifier, 18-25 parts of alkali metal salt aqueous solution, 0-1 part of pigment, and 1-2 parts of additive.

[0013] Preferably, the polyisocyanate is an aromatic diisocyanate, a dimer of an aromatic diisocyanate, a trimer of an aromatic diisocyanate, or an oligomer derivative of an aromatic diisocyanate.

[0014] Preferably, the polyisocyanate is polymeric MDI.

[0015] Preferably, the active emulsifier is an active epoxy compound, and the active epoxy compound is one or more of liquid bisphenol A epoxy resin, hydrogenated bisphenol A epoxy resin or epoxy active diluent.

[0016] Preferably, the alkali metal salt aqueous solution is a silicate aqueous solution and / or a borate aqueous solution.

[0017] Preferably, the pigment is one or more of carbon black, phthalocyanine green, phthalocyanine blue, quinoline yellow and quinacridone red.

[0018] Preferably, the auxiliary agent is one or more of a catalyst, a rheological agent and a leveling agent.

[0019] A method for preparing any of the above-mentioned water-based hybrid polyurea heavy-duty anticorrosive coatings comprises the following steps:

[0020] Step 1: Disperse and grind the active emulsifier, additives and pigment to a particle size of ≤10 μm to obtain component A;

[0021] Step 2: Mix the polyisocyanate at a speed of 300-500 r / min for 10-20 min to obtain component B;

[0022] Step 3: Mix the alkali metal salt aqueous solution at a speed of 300-500 r / min for 20-30 min to obtain component C;

[0023] Step 4: Mix component A and component B at a speed of 300-500r / min for 1-2min, adjust the stirring speed to 200-300r / min, add component C at a uniform speed, add it within 0.5-1 minute, and disperse it at a high speed of 500-1000r / min for 3-5 minutes to prepare a water-based hybrid polyurea heavy-duty anti-corrosion coating.

[0024] The present application also discloses the use of any of the above-mentioned water-based hybrid polyurea heavy-duty anti-corrosion coatings in wear-resistant anti-corrosion coatings on surfaces of steel, concrete, etc. in corrosive atmospheric environments and corrosive immersion environments.

[0025] Principle explanation: "Sol-gel" is the most effective method for synthesizing organic-inorganic hybrid polymers. It is chemically related to the condensation reaction of organic molecules. When the sol gels into wet gel, the nanoparticles aggregate and form an inorganic skeleton. Subsequently, under different drying conditions, two aerogels or dry gels with different structures are formed. The dry gel can be functionalized to connect the active groups on the surface of the gel. The hybrid polymer is formed by the reaction of the organic gel with the corresponding components. The "combined condensation" of this application is an innovative synthesis method. Compared with "sol-gel", it has more technical advantages. The characteristics of "combined condensation" are: since both organic and inorganic substances contain active groups, the organic and inorganic components can be polymerized simultaneously in their active mixture to obtain the most homogeneous interpenetrating network. By changing the organic and inorganic chemical compositions and their proportions, the physical and chemical properties of the final organic-inorganic hybrid polymer can be regulated over a wide range. The nanocomposite materials developed in this way have great application potential as heavy-duty anti-corrosion coatings.

[0026] Beneficial effects:

[0027] The present application provides a water-based hybrid polyurea heavy-duty anticorrosive coating and a preparation method and application thereof, which have the following beneficial effects:

[0028] 1. The water-based hybrid polyurea heavy-duty anticorrosive coating of the present application is obtained by the "joint polycondensation" reaction of polyisocyanate and active emulsifier in the presence of an alkali metal salt aqueous solution, and a dense molecular structure and nano-scale closed barrier are generated in situ, so that the water-based hybrid polyurea heavy-duty anticorrosive coating provided by the present application integrates the advantages of organic-inorganic composite materials, and has extremely high adhesion and mechanical strength, super chemical resistance and anticorrosion, and excellent heat resistance;

[0029] 2. The water-based hybrid polyurea heavy-duty anti-corrosion coating of this application is a non-hazardous chemical with zero VOC emissions. It is safe, environmentally friendly, non-toxic and odorless;

[0030] 3. The water-based hybrid polyurea heavy-duty anticorrosive coating of this application has good construction performance and can be sprayed, brushed or rolled on surfaces such as steel and concrete, in a single or double-layer system, saving labor and time;

[0031] 4. The water-based hybrid polyurea heavy-duty anticorrosive coating of this application is suitable for use in corrosive atmospheres and immersion environments, especially in extreme conditions and areas requiring corrosion resistance and wear resistance, including petrochemicals, marine engineering, ships and vessels, infrastructure, energy and transportation, mining and smelting, water treatment facilities, food and medicine, papermaking and printing, OEM, construction and other fields; as a primer / intermediate paint / topcoat or a single-layer system, the dry film thickness of a single coating can reach 350μm;

[0032] 5. The water-based hybrid polyurea heavy-duty anticorrosive coating of the present application is a room temperature curing system, and the curing temperature range is 10° C. to 60° C. The viscosity range of the water-based hybrid polyurea heavy-duty anticorrosive coating is controlled between 70-120KU, and the applicable period is 30-90 minutes. The solid content of waterborne hybrid polyurea heavy-duty anticorrosive coating is required to reach 85-95%. It is easy to apply by spraying, brushing or roller coating. The curing temperature can be as low as 10°C and the maximum relative humidity is 85%. It is used in the construction of marine engineering, ships, warships and storage tanks and pipelines by spraying, brushing or roller coating of 250-350 microns of waterborne hybrid polyurea heavy-duty anticorrosive coating. It is used in the surface construction of steel and concrete structures in corrosive atmospheric environments by spraying, brushing or roller coating the first coat of waterborne hybrid polyurea heavy-duty anticorrosive coating of 140-240 microns, and then the second coat of waterborne hybrid polyurea weather-resistant topcoat of 80-120 microns, which meets / exceeds HG / T 5059-2016 "Anticorrosion Coatings for Offshore Oil Platforms" and GB / T 50393-2017 "Technical Standards for Anticorrosion Engineering of Steel Petroleum Storage Tanks". DETAILED DESCRIPTION

[0033] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below in conjunction with the embodiments.

[0034] The aromatic diisocyanate is one or more of Suprasec 5005 (Huntsman), Desmodur 44V20L (Covestro), Lupranate M20 (BASF), and Wannate PM-200 (Wanhua).

[0035] Polymeric MDI is a mixture of 4,4'-diphenylmethane diisocyanate, higher functional isomers and homologs.

[0036] Liquid bisphenol A epoxy resins include Epon Resin 828 (Hexion), DER 331 (Dow), Araldite 250

[0037] (Huntsman), NPEL-128 (NanYa) or more thereof.

[0038] Hydrogenated bisphenol A epoxy resins include Eponex Resin 1510 (Hexion), EP-4080E (Adeka), ST-3000

[0039] (Kukdo), Epalloy 5000 (CVC), XY518 (Anhui Xinyuan Technology) or more.

[0040] Epoxy reactive diluents include Heloxy Modifier 8 (Hexion), Araldite DY-E (Huntsman), Epodil

[0041] 748 (Evonik), Erisys GE 8 (CVC) or more.

[0042] The catalyst is one or more of primary amino alcohol (AMP-Ultra PC, Angus), organic metal compound (Dabco Catalyst T-12, Evonik), inorganic salt (FeCl3, AlCl3, ZnCl2).

[0043] The rheological agent was a polyamide wax (Crayvallac Optima, Arkema).

[0044] The leveling agent is silicone.

[0045] Embodiment 1:

[0046] A water-based hybrid polyurea heavy-duty anti-corrosion coating. The raw materials of the water-based hybrid polyurea heavy-duty anti-corrosion coating are calculated by weight: 47.1 parts of polyisocyanate, 37.3 parts of active emulsifier, 14.2 parts of alkali metal salt aqueous solution, 0 parts of pigment, and 1.4 parts of additive.

[0047] The polyisocyanate is an aromatic diisocyanate, a dimer of an aromatic diisocyanate, a trimer of an aromatic diisocyanate, or an oligomer derivative of an aromatic diisocyanate.

[0048] Preferably, the polyisocyanate is polymeric MDI.

[0049] The active emulsifier is an active epoxy compound, and the active epoxy compound is one or more of liquid bisphenol A epoxy resin, hydrogenated bisphenol A epoxy resin or epoxy active diluent.

[0050] The alkali metal salt aqueous solution is a silicate aqueous solution and / or a borate aqueous solution, and has a dissolved solid content of 30-60%, especially 35-55%, and an alkali metal oxide content of 10-18%, especially 12-16%.

[0051] The pigment is one or more of carbon black, phthalocyanine green, phthalocyanine blue, quinoline yellow and quinacridone red.

[0052] The auxiliary agent is one or more of a catalyst, a rheological agent and a leveling agent.

[0053] A method for preparing a water-based hybrid polyurea heavy-duty anticorrosive coating comprises the following steps:

[0054] Step 1: Disperse and grind the active emulsifier, additives and pigment to a particle size of ≤10 μm to obtain component A;

[0055] Step 2: Mix the polyisocyanate at a speed of 300-500 r / min for 10-20 min to obtain component B;

[0056] Step 3: Mix the alkali metal salt aqueous solution at a speed of 300-500 r / min for 20-30 min to obtain component C;

[0057] Step 4: Mix component A and component B at a speed of 300-500r / min for 1-2min, adjust the stirring speed to 200-300r / min, add component C at a uniform speed, add it within 0.5-1 minute, and disperse it at a high speed of 500-1000r / min for 3-5 minutes to prepare a water-based hybrid polyurea heavy-duty anti-corrosion coating.

[0058] The water-based hybrid polyurea heavy-duty anticorrosive coating is used in wear-resistant anticorrosive coatings on surfaces of steel, concrete, etc. in corrosive atmospheric environments and corrosive immersion environments.

[0059] Embodiment 2:

[0060] A water-based hybrid polyurea heavy-duty anti-corrosion coating. The raw materials of the water-based hybrid polyurea heavy-duty anti-corrosion coating are mixed in proportion by weight: 45 parts of polyisocyanate, 35.6 parts of active emulsifier, 18 parts of alkali metal salt aqueous solution, 0 parts of pigment, and 1.4 parts of auxiliary agent.

[0061] The polyisocyanate is an aromatic diisocyanate, a dimer of an aromatic diisocyanate, a trimer of an aromatic diisocyanate, or an oligomer derivative of an aromatic diisocyanate.

[0062] Preferably, the polyisocyanate is polymeric MDI.

[0063] The active emulsifier is an active epoxy compound, and the active epoxy compound is one or more of liquid bisphenol A epoxy resin, hydrogenated bisphenol A epoxy resin or epoxy active diluent.

[0064] The alkali metal salt aqueous solution is a silicate aqueous solution and / or a borate aqueous solution.

[0065] The pigment is one or more of carbon black, phthalocyanine green, phthalocyanine blue, quinoline yellow and quinacridone red.

[0066] The auxiliary agent is one or more of a catalyst, a rheological agent and a leveling agent.

[0067] A method for preparing a water-based hybrid polyurea heavy-duty anticorrosive coating comprises the following steps:

[0068] Step 1: Disperse and grind the active emulsifier, additives and pigment to a particle size of ≤10 μm to obtain component A;

[0069] Step 2: Mix the polyisocyanate at a speed of 300-500 r / min for 10-20 min to obtain component B;

[0070] Step 3: Mix the alkali metal salt aqueous solution at a speed of 300-500 r / min for 20-30 min to obtain component C;

[0071] Step 4: Mix component A and component B at a speed of 300-500r / min for 1-2min, adjust the stirring speed to 200-300r / min, add component C at a uniform speed, add it within 0.5-1 minute, and disperse it at a high speed of 500-1000r / min for 3-5 minutes to prepare a water-based hybrid polyurea heavy-duty anti-corrosion coating.

[0072] The water-based hybrid polyurea heavy-duty anticorrosive coating is used in the wear-resistant anticorrosive coating on the surface of steel, concrete, etc. in a corrosive atmospheric environment and a corrosive immersion environment. Coating thickness: 250-350 microns.

[0073] Embodiment 3:

[0074] A water-based hybrid polyurea heavy-duty anti-corrosion coating. The raw materials of the water-based hybrid polyurea heavy-duty anti-corrosion coating are calculated by weight: 43 parts of polyisocyanate, 34.1 parts of active emulsifier, 21.5 parts of alkali metal salt aqueous solution, 0 parts of pigment, and 1.4 parts of additive.

[0075] The polyisocyanate is an aromatic diisocyanate, a dimer of an aromatic diisocyanate, a trimer of an aromatic diisocyanate, or an oligomer derivative of an aromatic diisocyanate.

[0076] Preferably, the polyisocyanate is polymeric MDI.

[0077] The active emulsifier is an active epoxy compound, and the active epoxy compound is one or more of liquid bisphenol A epoxy resin, hydrogenated bisphenol A epoxy resin or epoxy active diluent.

[0078] The alkali metal salt aqueous solution is a silicate aqueous solution and / or a borate aqueous solution.

[0079] The pigment is one or more of carbon black, phthalocyanine green, phthalocyanine blue, quinoline yellow and quinacridone red.

[0080] The auxiliary agent is one or more of a catalyst, a rheological agent and a leveling agent.

[0081] A method for preparing a water-based hybrid polyurea heavy-duty anticorrosive coating comprises the following steps:

[0082] Step 1: Disperse and grind the active emulsifier, additives and pigment to a particle size of ≤10 μm to obtain component A;

[0083] Step 2: Mix the polyisocyanate at a speed of 300-500 r / min for 10-20 min to obtain component B;

[0084] Step 3: Mix the alkali metal salt aqueous solution at a speed of 300-500 r / min for 20-30 min to obtain component C;

[0085] Step 4: Mix component A and component B at a speed of 300-500r / min for 1-2min, adjust the stirring speed to 200-300r / min, add component C at a uniform speed, add it within 0.5-1 minute, and disperse it at a high speed of 500-1000r / min for 3-5 minutes to prepare a water-based hybrid polyurea heavy-duty anti-corrosion coating.

[0086] The water-based hybrid polyurea heavy-duty anticorrosive coating is used in the wear-resistant anticorrosive coating on the surface of steel, concrete, etc. in a corrosive atmospheric environment and a corrosive immersion environment. Coating thickness: 250-350 microns.

[0087] Embodiment 4:

[0088] A water-based hybrid polyurea heavy-duty anti-corrosion coating. The raw materials of the water-based hybrid polyurea heavy-duty anti-corrosion coating are prepared in the following proportions by weight: 41.2 parts of polyisocyanate, 32.7 parts of active emulsifier, 24.7 parts of alkali metal salt aqueous solution, 0 parts of pigment, and 1.4 parts of auxiliary agent.

[0089] The polyisocyanate is an aromatic diisocyanate, a dimer of an aromatic diisocyanate, a trimer of an aromatic diisocyanate, or an oligomer derivative of an aromatic diisocyanate.

[0090] Preferably, the polyisocyanate is polymeric MDI.

[0091] The active emulsifier is an active epoxy compound, and the active epoxy compound is one or more of liquid bisphenol A epoxy resin, hydrogenated bisphenol A epoxy resin or epoxy active diluent.

[0092] The alkali metal salt aqueous solution is a silicate aqueous solution and / or a borate aqueous solution.

[0093] The pigment is one or more of carbon black, phthalocyanine green, phthalocyanine blue, quinoline yellow and quinacridone red.

[0094] The auxiliary agent is one or more of a catalyst, a rheological agent and a leveling agent.

[0095] A method for preparing a water-based hybrid polyurea heavy-duty anticorrosive coating comprises the following steps:

[0096] Step 1: Disperse and grind the active emulsifier, additives and pigment to a particle size of ≤10 μm to obtain component A;

[0097] Step 2: Mix the polyisocyanate at a speed of 300-500 r / min for 10-20 min to obtain component B;

[0098] Step 3: Mix the alkali metal salt aqueous solution at a speed of 300-500 r / min for 20-30 min to obtain component C;

[0099] Step 4: Mix component A and component B at a speed of 300-500r / min for 1-2min, adjust the stirring speed to 200-300r / min, add component C at a uniform speed, add it within 0.5-1 minute, and disperse it at a high speed of 500-1000r / min for 3-5 minutes to prepare a water-based hybrid polyurea heavy-duty anti-corrosion coating.

[0100] The water-based hybrid polyurea heavy-duty anticorrosive coating is used in the wear-resistant anticorrosive coating on the surface of steel, concrete, etc. in a corrosive atmospheric environment and a corrosive immersion environment. Coating thickness: 250-350 microns.

[0101] Embodiment 5:

[0102] A water-based hybrid polyurea heavy-duty anti-corrosion coating. The raw materials of the water-based hybrid polyurea heavy-duty anti-corrosion coating are mixed in proportion by weight: 39.5 parts of polyisocyanate, 31.4 parts of active emulsifier, 27.7 parts of alkali metal salt aqueous solution, 0 parts of pigment, and 1.4 parts of auxiliary agent.

[0103] The polyisocyanate is an aromatic diisocyanate, a dimer of an aromatic diisocyanate, a trimer of an aromatic diisocyanate, or an oligomer derivative of an aromatic diisocyanate.

[0104] Preferably, the polyisocyanate is polymeric MDI.

[0105] The active emulsifier is an active epoxy compound, and the active epoxy compound is one or more of liquid bisphenol A epoxy resin, hydrogenated bisphenol A epoxy resin or epoxy active diluent.

[0106] The alkali metal salt aqueous solution is a silicate aqueous solution and / or a borate aqueous solution.

[0107] The pigment is one or more of carbon black, phthalocyanine green, phthalocyanine blue, quinoline yellow and quinacridone red.

[0108] The auxiliary agent is one or more of a catalyst, a rheological agent and a leveling agent.

[0109] A method for preparing a water-based hybrid polyurea heavy-duty anticorrosive coating comprises the following steps:

[0110] Step 1: Disperse and grind the active emulsifier, additives and pigment to a particle size of ≤10 μm to obtain component A;

[0111] Step 2: Mix the polyisocyanate at a speed of 300-500 r / min for 10-20 min to obtain component B;

[0112] Step 3: Mix the alkali metal salt aqueous solution at a speed of 300-500 r / min for 20-30 min to obtain component C;

[0113] Step 4: Mix component A and component B at a speed of 300-500r / min for 1-2min, adjust the stirring speed to 200-300r / min, add component C at a uniform speed, add it within 0.5-1 minute, and disperse it at a high speed of 500-1000r / min for 3-5 minutes to prepare a water-based hybrid polyurea heavy-duty anti-corrosion coating.

[0114] The water-based hybrid polyurea heavy-duty anticorrosive coating is used in the wear-resistant anticorrosive coating on the surface of steel, concrete, etc. in a corrosive atmospheric environment and a corrosive immersion environment. Coating thickness: 250-350 microns.

[0115] The composition, physical parameters and paint film properties of the waterborne hybrid polyurea heavy-duty anticorrosive coatings provided in Examples 1 to 5 are shown in Table 1.

[0116] Table 1: Composition and properties of waterborne hybrid polyurea heavy-duty anticorrosive coatings

[0117]

[0118] Hybrid polyurea vs. epoxy:

[0119]

[0120]

[0121] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A water-based hybrid polyurea heavy-duty anticorrosive coating, characterized in that: The raw materials of the water-based hybrid polyurea heavy-duty anticorrosive coating are calculated by weight: 39-48 parts of polyisocyanate, 31-38 parts of active emulsifier, 14-28 parts of alkali metal salt aqueous solution, 0-2 parts of pigment, and 0.5-3 parts of auxiliary agent.

2. The water-based hybrid polyurea heavy-duty anticorrosive coating according to claim 1, characterized in that: The raw materials of the water-based hybrid polyurea heavy-duty anticorrosive coating are calculated by weight: 41-45 parts of polyisocyanate, 32-36 parts of active emulsifier, 18-25 parts of alkali metal salt aqueous solution, 0-1 part of pigment, and 1-2 parts of auxiliary agent.

3. The water-based hybrid polyurea heavy-duty anticorrosive coating according to claim 1, characterized in that: The polyisocyanate is an aromatic diisocyanate, a dimer of an aromatic diisocyanate, a trimer of an aromatic diisocyanate, or an oligomer derivative of an aromatic diisocyanate.

4. The water-based hybrid polyurea heavy-duty anticorrosive coating according to claim 3, characterized in that: The polyisocyanate is polymeric MDI.

5. The water-based hybrid polyurea heavy-duty anticorrosive coating according to claim 1, characterized in that: The active emulsifier is an active epoxy compound, and the active epoxy compound is one or more of liquid bisphenol A epoxy resin, hydrogenated bisphenol A epoxy resin or epoxy active diluent.

6. The water-based hybrid polyurea heavy-duty anticorrosive coating according to claim 1, characterized in that: The alkali metal salt aqueous solution is a silicate aqueous solution and / or a borate aqueous solution.

7. The water-based hybrid polyurea heavy-duty anticorrosive coating according to claim 1, characterized in that: The pigment is one or more of carbon black, phthalocyanine green, phthalocyanine blue, quinoline yellow and quinacridone red.

8. The water-based hybrid polyurea heavy-duty anticorrosive coating according to claim 1, characterized in that: The auxiliary agent is one or more of a catalyst, a rheological agent and a leveling agent.

9. A method for preparing the waterborne hybrid polyurea heavy-duty anticorrosive coating according to any one of claims 1 to 8, characterized in that: The following steps are involved: Step 1: Disperse and grind the active emulsifier, additives and pigment to a particle size of ≤10 μm to obtain component A; Step 2: Mix the polyisocyanate at a speed of 300-500 r / min for 10-20 min to obtain component B; Step 3: Mix the alkali metal salt aqueous solution at a speed of 300-500 r / min for 20-30 min to obtain component C; Step 4: Mix component A and component B at a speed of 300-500r / min for 1-2min, adjust the stirring speed to 200-300r / min, add component C at a uniform speed, add it within 0.5-1 minute, and disperse it at a high speed of 500-1000r / min for 3-5 minutes to prepare a water-based hybrid polyurea heavy-duty anti-corrosion coating.

10. Use of the water-based hybrid polyurea heavy-duty anticorrosive coating according to any one of claims 1 to 8 in a wear-resistant anticorrosive coating on the surface of steel, concrete, etc. in a corrosive atmospheric environment or a corrosive immersion environment.

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