A water-based zinc-rich coating and its preparation method and application

Abstract

The present invention discloses a water-based zinc-rich coating, its preparation method, and application. The water-based zinc-rich coating of the present invention is composed of component A and component B, with the mass ratio of component A to component B being 1 to 3:1. Component A is zinc powder, and component B includes the following components in mass percentages: 60% to 75% of an acrylate emulsion modified with monobutyl itaconate; 24% to 39% of a silicate; 0.1% to 0.5% of a wetting agent; and 0.1% to 0.5% of a defoaming agent. The water-based zinc-rich coating of the present invention has excellent anti-settling properties, and its viscosity and drying speed meet requirements. The resulting paint film has good impact resistance, strong adhesion, and excellent salt spray resistance. It can be used for metal protection in fields such as marine engineering and oil pipelines, and is suitable for large-scale promotion and application.

Description

Technical Field

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

[0002] Waterborne inorganic zinc-rich paint is a type of water-based anti-corrosion paint widely used in heavy-duty corrosion protection applications. It uses high-modulus silicates (e.g., sodium silicate, potassium silicate, lithium silicate, etc.) as a base material. Through cross-linking with zinc powder under certain conditions, the resulting film exhibits excellent corrosion resistance, weather resistance, heat resistance, and solvent resistance. However, due to the high density of zinc powder in waterborne inorganic zinc-rich paint and the low viscosity of the liquid base (<100cps), zinc powder precipitation is very likely to occur during the mixing and application process. Consequently, the overall performance of the resulting paint film is significantly reduced due to the uneven distribution of film-forming substances caused by the settling of zinc powder. Currently, there are two common approaches to addressing the zinc powder sedimentation problem in water-based inorganic zinc-rich coatings: 1) adding an anti-settling agent to the liquid base material, or mixing a powder with high water absorption into the zinc powder. This method has a very limited anti-settling effect and can lead to a decrease in the corrosion resistance of the paint film; 2) continuously stirring the material during construction to prevent zinc powder sedimentation. This method can bring many inconveniences to construction and increase construction energy consumption.

[0003] Therefore, it is of great significance to develop a water-based zinc-rich coating with both excellent anti-corrosion performance and excellent anti-settling performance. Summary of the Invention

[0004] The purpose of the present invention is to provide a water-based zinc-rich paint and a preparation method and application thereof.

[0005] The technical solution adopted by the present invention is:

[0006] A water-based zinc-rich paint, comprising component A and component B, wherein the mass ratio of component A to component B is 1 to 3:1; the component A is zinc powder; and the component B comprises the following components in the following mass percentages:

[0007] Acrylate emulsion modified with monobutyl itaconate: 60% to 75%;

[0008] Silicate: 24% to 39%;

[0009] Wetting agent: 0.1% to 0.5%;

[0010] Defoaming agent: 0.1%~0.5%.

[0011] Preferably, the particle size of the zinc powder is ≤25 μm.

[0012] More preferably, the particle size of the zinc powder is 15 μm to 25 μm.

[0013] Preferably, the B component includes the following components in percentage by mass:

[0014] Acrylate emulsion modified with monobutyl itaconate: 65% to 75%;

[0015] Silicate: 24% to 34%;

[0016] Wetting agent: 0.1% to 0.3%;

[0017] Defoaming agent: 0.1%~0.5%.

[0018] Preferably, the monobutyl itaconate-modified acrylic emulsion is made from the following raw materials in percentage by mass:

[0019] Monomers used to prepare acrylic emulsions: 20% to 45%;

[0020] Monobutyl itaconate: 1% to 5%;

[0021] Silane coupling agent: 1% to 5%;

[0022] Initiator: 0.05% to 0.2%;

[0023] Emulsifier: 1% to 5%;

[0024] Water: Balance.

[0025] Further preferably, the monobutyl itaconate-modified acrylic emulsion is made of the following raw materials in percentage by mass:

[0026] Monomers used to prepare acrylic emulsions: 25% to 40%;

[0027] Monobutyl itaconate: 1.5% to 4.5%;

[0028] Silane coupling agent: 1% to 5%;

[0029] Initiator: 0.1% to 0.2%;

[0030] Emulsifier: 1% to 2%;

[0031] Water: Balance.

[0032] Preferably, the monomers used to prepare the acrylic ester emulsion are at least three of methyl methacrylate, ethyl methacrylate, styrene, ethyl acrylate, butyl acrylate, n-octyl methacrylate, tetraethylene glycol dimethacrylate, and triethylene glycol dimethacrylate.

[0033] Preferably, the hair growth agent is at least one of ammonium persulfate, potassium persulfate, sodium persulfate, and tert-butyl hydroperoxide.

[0034] Preferably, the emulsifier is C 10 ~C 20 Sodium alkyl sulfate, C 10 ~C 20 Sodium alkylbenzene sulfonate, C 10 ~C 20 At least one of sodium alkylnaphthalenesulfonate, sodium dialkyl-2-sulfosuccinate, and sodium sulfosuccinate.

[0035] More preferably, the emulsifier is ethoxylated alkylphenol ammonium sulfate.

[0036] Preferably, the butyl itaconate-modified acrylic emulsion is prepared by any one of the following methods:

[0037] Method 1:

[0038] 1) taking part of the water to prepare an initiator solution;

[0039] 2) taking a portion of the water-dispersible emulsifier, and then adding the monomer used to prepare the acrylic emulsion, monobutyl itaconate, a silane coupling agent and a portion of the initiator solution to react to obtain a pre-emulsion;

[0040] 3) heating the remaining water to 70° C. to 80° C., adding a portion of the initiator solution while stirring, and then simultaneously adding the pre-emulsion and the remaining initiator solution dropwise. After the addition is complete, the mixture is kept warm for reaction, cooled to room temperature, and filtered to obtain a monobutyl itaconate-modified acrylate emulsion.

[0041] Method 2:

[0042] 1) taking part of the water to prepare an initiator solution;

[0043] 2) taking a portion of the water-dispersed emulsifier, adding a portion of the monomer for preparing the acrylic emulsion, monobutyl itaconate, a portion of the silane coupling agent, and a portion of the initiator solution to react to obtain a pre-emulsion I; taking a portion of the water-dispersed emulsifier, adding the remaining monomer for preparing the acrylic emulsion, the remaining silane coupling agent, and a portion of the initiator solution to react to obtain a pre-emulsion II;

[0044] 3) The remaining water is heated to 70° C. to 80° C., and a portion of the initiator solution is added while stirring. The pre-emulsion I and a portion of the initiator solution are then added dropwise. After the addition is complete, the mixture is kept warm for reaction. The remaining initiator solution is then added dropwise, and the pre-emulsion II is added dropwise. After the addition is complete, the mixture is kept warm for reaction. The mixture is then cooled to room temperature and filtered to obtain a monobutyl itaconate-modified acrylic emulsion.

[0045] Preferably, the silicate is at least one of lithium silicate, sodium silicate and potassium silicate.

[0046] Preferably, the wetting agent is at least one of alkyl sulfates, sulfonates, fatty acids, fatty acid sulfates, carboxylic acid soaps, phosphates, polyoxyethylene alkylphenol ethers, polyether-modified polysiloxanes, and polyoxyethylene block copolymers.

[0047] More preferably, the wetting agent is at least one of polyoxyethylene alkylphenol ether and polyether-modified polysiloxane.

[0048] Preferably, the defoaming agent is at least one of an organosilicon compound, a higher alcohol fatty acid ester complex, a polyoxyethylene polyoxypropylene pentaerythritol ether, a polyoxyethylene polyoxypropanolamine ether, a polyoxypropylene glycerol ether, and an acetylene glycol.

[0049] More preferably, the defoaming agent is at least one of an organosilicon compound and an acetylene glycol.

[0050] A method for preparing the water-based zinc-rich coating as described above comprises the following steps: uniformly mixing an acrylate emulsion modified with monobutyl itaconate, a silicate, a wetting agent and a defoamer, and then adding zinc powder while stirring to obtain the water-based zinc-rich coating.

[0051] The water-based zinc-rich coating is used for metal protection in the field of marine engineering or oil pipelines.

[0052] The beneficial effects of the present invention are as follows: the water-based zinc-rich coating of the present invention has excellent anti-settling performance, and the viscosity and drying speed meet the requirements; the formed paint film has good impact resistance, strong adhesion, and excellent salt spray resistance; it can be used for metal protection in marine engineering, oil pipelines and other fields, and is suitable for large-scale promotion and application.

[0053] Specifically:

[0054] The water-based zinc-rich coating of the present invention contains an acrylate emulsion modified with monobutyl itaconate. The itaconic acid molecule contains two active carboxyl groups and a double bond, and the double bond and the carboxyl group are in a conjugated relationship. Therefore, the monobutyl itaconate is polymerized with a monomer for preparing the acrylate emulsion to form a high-molecular chelating agent. Therefore, the obtained acrylate emulsion modified with monobutyl itaconate can exhibit better dispersibility and compatibility after being mixed with zinc powder, and has a higher viscosity, which can greatly reduce the sedimentation of the zinc powder. DETAILED DESCRIPTION

[0055] The present invention will be further explained and illustrated below with reference to specific embodiments.

[0056] Example 1:

[0057] A water-based zinc-rich paint is composed of component A and component B, the mass ratio of component A to component B is 6:4, component A is 500-mesh zinc powder (Hubei Qibajiu Chemical Co., Ltd.), and the composition of component B is shown in the following table:

[0058] Table 1 Composition of component B in water-based zinc-rich coating

[0059]

[0060] Note:

[0061] The raw material composition of the acrylic emulsion modified with monobutyl itaconate is shown in the following table:

[0062] Table 2 Raw material composition of butyl itaconate modified acrylic emulsion

[0063]

[0064]

[0065] The preparation method of the above-mentioned monobutyl itaconate-modified acrylic emulsion is as follows:

[0066] 1) preparing an ammonium persulfate solution by adding 3 parts by mass of deionized water to ammonium persulfate;

[0067] 2) dispersing 0.8 parts by mass of ethoxylated alkylphenol ammonium sulfate in 0.8 parts by mass of deionized water, adding 18.3 parts by mass of a monomer for preparing an acrylic emulsion, monobutyl itaconate, 2 parts by mass of a silane coupling agent, and 0.08 parts by mass of an ammonium persulfate solution, and stirring uniformly to obtain a pre-emulsion I; dispersing the remaining ethoxylated alkylphenol ammonium sulfate in 0.8 parts by mass of deionized water, and adding the remaining monomer for preparing an acrylic emulsion, the remaining silane coupling agent, and 0.08 parts by mass of an ammonium persulfate solution, and stirring uniformly to obtain a pre-emulsion II;

[0068] 3) The remaining deionized water was heated to 75° C., stirring was started, and the stirrer speed was adjusted to 150 rpm. 0.1 parts by mass of ammonium persulfate solution was added while stirring, and then the pre-emulsion I and 1.9 parts by mass of ammonium persulfate solution were added dropwise simultaneously. The addition was completed within 1 hour. After the addition was completed, the mixture was kept warm for 3 minutes. The remaining ammonium persulfate solution was added, and then the pre-emulsion II was added dropwise. The addition was completed within 1 hour. After the addition was completed, the mixture was kept warm for 1 hour. The mixture was then cooled to room temperature and filtered through a 250-mesh filter to obtain a monobutyl itaconate-modified acrylic emulsion.

[0069] The preparation method of the above-mentioned water-based zinc-rich coating is as follows:

[0070] Heat the monobutyl itaconate-modified acrylic emulsion to 55°C, start stirring, adjust the stirrer speed to 150 rpm, then slowly add silicate while stirring, keep warm for 25 minutes after addition, then add polyether-modified polysiloxane wetting agent and organosilicon compound defoaming agent while stirring, stir for 15 minutes after addition, then add zinc powder while stirring, stir for 5 minutes after addition, and obtain a water-based zinc-rich coating.

[0071] Example 2:

[0072] A water-based zinc-rich paint, which consists of component A and component B, the mass ratio of component A to component B is 7:3, component A is 800-mesh zinc powder (Hunan Ruishi Technology Development Co., Ltd.), and the composition of component B is shown in the following table:

[0073] Table 3 Composition of component B in water-based zinc-rich coating

[0074]

[0075]

[0076] Note:

[0077] The raw material composition of the acrylic emulsion modified with monobutyl itaconate is shown in the following table:

[0078] Table 4 Raw material composition of butyl itaconate modified acrylic emulsion

[0079]

[0080] The preparation method of the above-mentioned monobutyl itaconate-modified acrylic emulsion is as follows:

[0081] 1) preparing an ammonium persulfate solution by adding 2 parts by mass of deionized water to ammonium persulfate;

[0082] 2) dispersing ethoxylated alkylphenol ammonium sulfate in 1.6 parts by mass of deionized water, adding monomers for preparing an acrylic emulsion, monobutyl itaconate, a silane coupling agent, and 0.16 parts by mass of an ammonium persulfate solution, and stirring uniformly to obtain a pre-emulsion;

[0083] 3) The remaining deionized water was heated to 75° C., stirring was started, and the stirrer speed was adjusted to 150 rpm. 0.1 parts by mass of ammonium persulfate solution was added while stirring, and the pre-emulsion and the remaining ammonium persulfate solution were added dropwise simultaneously. The addition was completed over 1 hour. After the addition was completed, the mixture was kept warm for 1 hour, then cooled to room temperature, and filtered through a 250-mesh filter to obtain a monobutyl itaconate-modified acrylic emulsion.

[0084] The preparation method of the above-mentioned water-based zinc-rich coating is as follows:

[0085] Heat the monobutyl itaconate-modified acrylic emulsion to 55°C, start stirring, adjust the stirrer speed to 150 rpm, then slowly add silicate while stirring, keep warm for 25 minutes after addition, then add polyether-modified polysiloxane wetting agent and acetylene glycol defoamer while stirring, stir for 15 minutes after addition, then add zinc powder while stirring, stir for 5 minutes after addition, and obtain a water-based zinc-rich coating.

[0086] Example 3:

[0087] A water-based zinc-rich paint, which consists of component A and component B, the mass ratio of component A to component B is 7:3, component A is 800-mesh zinc powder (Hunan Ruishi Technology Development Co., Ltd.), and the composition of component B is shown in the following table:

[0088] Table 5 Composition of component B in water-based zinc-rich coating

[0089]

[0090] Note:

[0091] The raw material composition of the acrylic emulsion modified with monobutyl itaconate is shown in the following table:

[0092] Table 6 Raw material composition of butyl itaconate modified acrylic emulsion

[0093]

[0094]

[0095] The preparation method of the above-mentioned monobutyl itaconate-modified acrylic emulsion is as follows:

[0096] 1) preparing an ammonium persulfate solution by adding 2 parts by mass of deionized water to ammonium persulfate;

[0097] 2) dispersing ethoxylated alkylphenol ammonium sulfate in 1.6 parts by mass of deionized water, adding monomers for preparing an acrylic emulsion, monobutyl itaconate, a silane coupling agent, and 0.1 parts by mass of an ammonium persulfate solution, and stirring uniformly to obtain a pre-emulsion;

[0098] 3) The remaining deionized water was heated to 75° C., stirring was started, and the stirrer speed was adjusted to 150 rpm. 0.06 parts by mass of ammonium persulfate solution was added while stirring, and the pre-emulsion and the remaining ammonium persulfate solution were added dropwise simultaneously. The addition was completed over 1 hour. After the addition was completed, the mixture was kept warm for 1 hour, then cooled to room temperature, and filtered through a 250-mesh filter to obtain a monobutyl itaconate-modified acrylic emulsion.

[0099] The preparation method of the above-mentioned water-based zinc-rich coating is as follows:

[0100] Heat the monobutyl itaconate-modified acrylic emulsion to 55°C, start stirring, adjust the stirrer speed to 150 rpm, then slowly add silicate while stirring, keep warm for 25 minutes after addition, then add polyether-modified polysiloxane wetting agent and acetylene glycol defoamer while stirring, stir for 15 minutes after addition, then add zinc powder while stirring, stir for 5 minutes after addition, and obtain a water-based zinc-rich coating.

[0101] Example 4:

[0102] A water-based zinc-rich paint, which consists of component A and component B, the mass ratio of component A to component B is 7:3, component A is 800-mesh zinc powder (Hunan Ruishi Technology Development Co., Ltd.), and the composition of component B is shown in the following table:

[0103] Table 7 Composition of component B in water-based zinc-rich coating

[0104]

[0105]

[0106] Note:

[0107] The raw material composition of the acrylic emulsion modified with monobutyl itaconate is shown in the following table:

[0108] Table 8 Raw material composition of butyl itaconate modified acrylic emulsion

[0109]

[0110] The preparation method of the above-mentioned monobutyl itaconate-modified acrylic emulsion is as follows:

[0111] 1) preparing an ammonium persulfate solution by adding 2 parts by mass of deionized water to ammonium persulfate;

[0112] 2) dispersing ethoxylated alkylphenol ammonium sulfate in 1.6 parts by mass of deionized water, adding monomers for preparing an acrylic emulsion, monobutyl itaconate, a silane coupling agent, and 0.1 parts by mass of an ammonium persulfate solution, and stirring uniformly to obtain a pre-emulsion;

[0113] 3) The remaining deionized water was heated to 75° C., stirring was started, and the stirrer speed was adjusted to 150 rpm. 0.06 parts by mass of ammonium persulfate solution was added while stirring, and the pre-emulsion and the remaining ammonium persulfate solution were added dropwise simultaneously. The addition was completed over 1 hour. After the addition was completed, the mixture was kept warm for 1 hour, then cooled to room temperature, and filtered through a 250-mesh filter to obtain a monobutyl itaconate-modified acrylic emulsion.

[0114] The preparation method of the above-mentioned water-based zinc-rich coating is as follows:

[0115] Heat the monobutyl itaconate-modified acrylic emulsion to 55°C, start stirring, adjust the stirrer speed to 150 rpm, then slowly add silicate while stirring, keep warm for 25 minutes after addition, then add polyether-modified polysiloxane wetting agent and acetylene glycol defoamer while stirring, stir for 15 minutes after addition, then add zinc powder while stirring, stir for 5 minutes after addition, and obtain a water-based zinc-rich coating.

[0116] Example 5:

[0117] A water-based zinc-rich paint, which consists of component A and component B, the mass ratio of component A to component B is 7:3, component A is 800-mesh zinc powder (Hunan Ruishi Technology Development Co., Ltd.), and the composition of component B is shown in the following table:

[0118] Table 9 Composition of component B in water-based zinc-rich coating

[0119]

[0120] Note:

[0121] The raw material composition of the acrylic emulsion modified with monobutyl itaconate is shown in the following table:

[0122] Table 10 Raw material composition of butyl itaconate modified acrylic emulsion

[0123]

[0124]

[0125] The preparation method of the above-mentioned monobutyl itaconate-modified acrylic emulsion is as follows:

[0126] 1) preparing an ammonium persulfate solution by adding 2 parts by mass of deionized water to ammonium persulfate;

[0127] 2) dispersing ethoxylated alkylphenol ammonium sulfate in 1.6 parts by mass of deionized water, adding monomers for preparing an acrylic emulsion, monobutyl itaconate, a silane coupling agent, and 0.1 parts by mass of an ammonium persulfate solution, and stirring uniformly to obtain a pre-emulsion;

[0128] 3) The remaining deionized water was heated to 75° C., stirring was started, and the stirrer speed was adjusted to 150 rpm. 0.06 parts by mass of ammonium persulfate solution was added while stirring, and the pre-emulsion and the remaining ammonium persulfate solution were added dropwise simultaneously. The addition was completed over 1 hour. After the addition was completed, the mixture was kept warm for 1 hour, then cooled to room temperature, and filtered through a 250-mesh filter to obtain a monobutyl itaconate-modified acrylic emulsion.

[0129] The preparation method of the above-mentioned water-based zinc-rich coating is as follows:

[0130] Heat the monobutyl itaconate-modified acrylic emulsion to 55°C, start stirring, adjust the stirrer speed to 150 rpm, then slowly add silicate while stirring, keep warm for 25 minutes after addition, then add polyether-modified polysiloxane wetting agent and acetylene glycol defoamer while stirring, stir for 15 minutes after addition, then add zinc powder while stirring, stir for 5 minutes after addition, and obtain a water-based zinc-rich coating.

[0131] Comparative Example 1:

[0132] A water-based zinc-rich paint, which consists of component A and component B, the mass ratio of component A to component B is 7:3, component A is 800-mesh zinc powder (Hunan Ruishi Technology Development Co., Ltd.), and the composition of component B is shown in the following table:

[0133] Table 11 Composition of component B in water-based zinc-rich coating

[0134]

[0135] Note:

[0136] The raw material composition of acrylic emulsion is shown in the following table:

[0137] Table 12 Raw material composition of acrylic emulsion

[0138]

[0139]

[0140] The preparation method of the above-mentioned acrylic ester emulsion is as follows:

[0141] 1) preparing an ammonium persulfate solution by adding 2 parts by mass of deionized water to ammonium persulfate;

[0142] 2) dispersing ethoxylated alkylphenol ammonium sulfate in 1.6 parts by mass of deionized water, adding monomers for preparing an acrylic emulsion, a silane coupling agent, and 0.1 parts by mass of an ammonium persulfate solution, and stirring uniformly to obtain a pre-emulsion;

[0143] 3) The remaining deionized water was heated to 75° C., stirring was started, and the stirrer speed was adjusted to 150 rpm. 0.06 parts by mass of ammonium persulfate solution was added while stirring, and the pre-emulsion and the remaining ammonium persulfate solution were added dropwise simultaneously. The addition was completed over 1 hour. After the addition was completed, the mixture was kept warm for 1 hour, then cooled to room temperature and filtered through a 250-mesh filter to obtain an acrylic emulsion.

[0144] The preparation method of the above-mentioned water-based zinc-rich coating is as follows:

[0145] Heat the acrylic emulsion to 55°C, start stirring, adjust the speed of the stirrer to 150 rpm, then slowly add silicate while stirring, keep warm for 25 minutes after addition, then add polyether modified polysiloxane wetting agent and acetylene glycol defoamer while stirring, stir for 15 minutes after addition, then add zinc powder while stirring, stir for 5 minutes after addition, and obtain water-based zinc-rich coating.

[0146] Comparative Example 2:

[0147] A water-based zinc-rich paint, the composition of which is shown in the following table:

[0148] Table 13 Composition of water-based zinc-rich coatings

[0149]

[0150] The preparation method of the above-mentioned water-based zinc-rich coating is as follows:

[0151] Mix the potassium silicate aqueous solution and the lithium silicate aqueous solution, start stirring, adjust the stirrer speed to 150 rpm, then add hydrophilic fumed silica, methyl cellulose ether, polyether modified polysiloxane wetting agent and acetylene glycol defoamer while stirring, stir for 15 minutes after adding, then add zinc powder while stirring, stir for 5 minutes after adding, and obtain a water-based zinc-rich coating.

[0152] Comparative Example 3:

[0153] Commercially available water-based zinc-rich paint (Dieyan Paint Official Flagship Store, brand Dieyan 704, the main component of component A is a potassium silicate aqueous solution with a solid content of 18%, component B is zinc powder, and the mass ratio of component A to component B is 3:7).

[0154] Performance testing:

[0155] 1) The viscosity and sedimentation velocity test results of the water-based zinc-rich coatings of Examples 1 to 5 and Comparative Examples 1 to 3 are shown in the following table:

[0156] Table 14 Viscosity and sedimentation velocity test results of water-based zinc-rich coatings

[0157]

[0158] From Table 14 we can see that:

[0159] a) The viscosity of the water-based zinc-rich coatings of Examples 1 to 5 and Comparative Examples 1 to 3 is in the range of 20s to 65s (coating 4# cup), and both have good spraying viscosity;

[0160] b) The water-based zinc-rich coatings of Examples 1 to 5 have a lower sedimentation rate and better anti-settling property than the water-based zinc-rich coatings of Comparative Examples 1 to 3. This is because the addition of the acrylate emulsion modified with monobutyl itaconate makes the anti-settling additive in the coating more effective;

[0161] This shows that the water-based zinc-rich paint of the present invention has good construction performance.

[0162] 2) The performance of the water-based zinc-rich coatings of Examples 1 to 5 and Comparative Examples 1 to 3 was tested with reference to "HG / T 3668-2009 Zinc-rich Primer". The test results are shown in the following table:

[0163] Table 15 Performance test results of water-based zinc-rich coatings

[0164]

[0165]

[0166] It can be seen from Table 15 that the water-based zinc-rich coating of the present invention not only meets the paint film performance requirements of the industry standard "HG / T 3668-2009 Zinc-rich Primer", but also far exceeds its index value in terms of salt spray resistance, and has very excellent anti-corrosion performance.

[0167] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be considered as equivalent replacement methods and are included in the scope of protection of the present invention.

Claims

1. A water-based zinc-rich paint, characterized in that: The invention is composed of component A and component B, wherein the mass ratio of component A to component B is 1 to 3:1; the component A is zinc powder; and the component B includes the following components in the following mass percentages: Acrylate emulsion modified with monobutyl itaconate: 60% to 75%; Silicate: 24% to 39%; Wetting agent: 0.1% to 0.5%; Defoaming agent: 0.1%~0.5%; The butyl itaconate-modified acrylic emulsion is made from the following raw materials in percentage by mass: Monomers used to prepare acrylic emulsions: 20% to 45%; Monobutyl itaconate: 1% to 5%; Silane coupling agent: 1% to 5%; Initiator: 0.05%~0.2%; Emulsifier: 1% to 5%; Water: Balance.

2. The water-based zinc-rich paint according to claim 1, characterized in that: The particle size of the zinc powder is ≤25 μm.

3. The water-based zinc-rich paint according to claim 1, characterized in that: The monomers used to prepare the acrylic ester emulsion are at least three of methyl methacrylate, ethyl methacrylate, styrene, ethyl acrylate, butyl acrylate, n-octyl methacrylate, tetraethylene glycol dimethacrylate, and triethylene glycol dimethacrylate.

4. The water-based zinc-rich paint according to claim 1, characterized in that: The initiator is at least one of ammonium persulfate, potassium persulfate, sodium persulfate, and tert-butyl hydroperoxide; the emulsifier is C 10 ~C 20 Sodium alkyl sulfate, C 10 ~C 20 Sodium alkylbenzene sulfonate, C 10 ~C 20 At least one of sodium alkylnaphthalenesulfonate, sodium dialkyl-2-sulfosuccinate, and sodium sulfosuccinate.

5. The water-based zinc-rich paint according to any one of claims 3 to 4, characterized in that: The butyl itaconate-modified acrylic emulsion is prepared by any of the following methods: Method 1: 1) Take part of the water to prepare the initiator into an initiator solution; 2) taking a portion of the water-dispersible emulsifier, adding the monomer used to prepare the acrylic emulsion, monobutyl itaconate, a silane coupling agent, and a portion of the initiator solution to react to obtain a pre-emulsion; 3) Heat the remaining water to 70-80°C, add a portion of the initiator solution while stirring, and then dropwise add the pre-emulsion and the remaining initiator solution. After the addition is complete, keep the mixture warm for reaction, cool to room temperature, and filter to obtain a monobutyl itaconate-modified acrylate emulsion. Method 2: 1) Take part of the water to prepare the initiator into an initiator solution; 2) dispersing part of the emulsifier in water, adding part of the monomer for preparing the acrylic emulsion, monobutyl itaconate, part of the silane coupling agent, and part of the initiator solution to react to obtain a pre-emulsion I; dispersing part of the remaining emulsifier in water, adding the remaining monomer for preparing the acrylic emulsion, the remaining silane coupling agent, and part of the initiator solution to react to obtain a pre-emulsion II; 3) Heat the remaining water to 70-80°C, then add part of the initiator solution while stirring, then dropwise add pre-emulsion I and part of the initiator solution at the same time, keep warm after addition, then add the remaining initiator solution, then dropwise add pre-emulsion II, keep warm after addition, then cool to room temperature, filter, and obtain the monobutyl itaconate-modified acrylic emulsion.

6. The water-based zinc-rich paint according to any one of claims 1 to 4, characterized in that: The silicate is at least one of lithium silicate, sodium silicate and potassium silicate.

7. The water-based zinc-rich paint according to any one of claims 1 to 4, characterized in that: The wetting agent is at least one of alkyl sulfates, sulfonates, fatty acids, fatty acid sulfates, carboxylic acid soaps, phosphates, polyoxyethylene alkylphenol ethers, polyether-modified polysiloxanes, and polyoxyethylene block copolymers; the defoaming agent is at least one of organosilicon compounds, high-carbon alcohol fatty acid ester complexes, polyoxyethylene polyoxypropylene pentaerythritol ethers, polyoxyethylene polyoxypropanolamine ethers, polyoxypropylene glycerol ethers, and acetylenic diols.

8. A method for preparing a water-based zinc-rich coating according to any one of claims 1 to 7, characterized in that: The following steps are involved: The monobutyl itaconate-modified acrylic emulsion, silicate, wetting agent and defoaming agent are mixed evenly, and then zinc powder is added while stirring to obtain a water-based zinc-rich coating.

9. Use of the water-based zinc-rich paint according to any one of claims 1 to 7 for metal protection in the field of marine engineering or oil pipelines.

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