CN115109489A

CN115109489A - Water-based damping coating with antistatic property, corrosion resistance and flame retardant property, and preparation method and application thereof

Info

Publication number: CN115109489A
Application number: CN202210894979.6A
Authority: CN
Inventors: 邓云娇; 梁晓波; 李松松; 吴景涛; 王双权; 张求学; 王晓娟; 郭馨月
Original assignee: Changchun University of Technology
Current assignee: Changchun University of Technology
Priority date: 2022-07-28
Filing date: 2022-07-28
Publication date: 2022-09-27

Abstract

The invention provides an aqueous damping coating with antistatic property, corrosion resistance and flame retardance, and a preparation method and application thereof, and belongs to the technical field of damping coatings. The coating provided by the invention takes the waterborne polyurethane/acrylate core-shell composite emulsion as a basic emulsion, combines the excellent properties of polyurethane and polyacrylate, and is beneficial to improving the comprehensive properties of the coating; according to the invention, the damping filler, the conductive filler and the flame retardant filler are introduced into the coating, so that the transmission and permeation of a medium can be effectively blocked, the internal friction of the coating is increased, the internal consumption is improved, the effective transmission of electrons can be promoted, the accumulation of charges is avoided, the heat required by the combustion of the coating is improved, the ignition point is improved, the coating has excellent damping performance, antistatic performance, corrosion resistance and flame retardant performance, and the application field of the coating is widened. Compared with the solvent type and asphalt type damping coatings widely applied at present, the coating provided by the invention uses water as a dispersion medium, and belongs to an environment-friendly coating.

Description

Water-based damping coating with antistatic property, corrosion resistance and flame retardant property, and preparation method and application thereof

Technical Field

The invention relates to the technical field of damping coatings, in particular to an aqueous damping coating with antistatic property, corrosion resistance and flame retardance, and a preparation method and application thereof.

Background

The damping coating can convert mechanical vibration energy and sound wave vibration energy into other forms of energy to be consumed, so that the damping coating has a wide application prospect in the aspects of shock absorption and noise reduction, and is widely applied to the fields of rail trains, aerospace and automobile industries.

In the practical use process of the coating, the electrical insulation property can cause larger static accumulation, has certain potential safety hazard, and simultaneously limits the application range of the damping coating in a specific environment. Therefore, the development of the damping coating with antistatic property has important significance. Corrosion is a phenomenon in which a metal material undergoes chemical or electrochemical reaction with the surrounding medium to become a metal compound, which is subject to destruction. Corrosion protection is particularly important because of the enormous losses that occur worldwide each year due to corrosion. In recent years, with the increasing of fire safety regulation, people pay more and more attention to the requirement of reducing the fire hazard caused by flammable materials. The application and development of the waterborne polyurethane coating are limited due to the flammability problem of the waterborne polyurethane coating, and the proper flame-retardant coating can delay the ignition time of the material or inhibit the flame spread, so that the fire hazard is eliminated, and the life and property loss is reduced. The coating can be applied in a wide range, and meanwhile, the potential safety hazard can be eliminated, and the life and property safety of people can be effectively guaranteed. Therefore, the development of the water-based damping coating with antistatic property, corrosion resistance and flame retardant property has important significance.

Disclosure of Invention

The invention aims to provide an aqueous damping coating with antistatic property, corrosion resistance and flame retardant property, and a preparation method and application thereof.

In order to achieve the above object, the present invention provides the following technical solutions:

the invention provides an aqueous damping coating with antistatic property, corrosion resistance and flame retardant property, which comprises the following components in parts by weight:

40-60 parts of waterborne polyurethane/acrylate core-shell composite emulsion, wherein the latex particles in the waterborne polyurethane/acrylate core-shell composite emulsion take polyurethane as a shell and polyacrylate as a core;

the mass portion of the damping filler is marked as a, and a is more than 0 and less than or equal to 55;

the conductive filler is marked as b by mass part, and b is more than 0 and less than or equal to 30;

the flame-retardant filler is marked as c in parts by weight, and c is more than 0 and less than or equal to 30;

and d is taken as the auxiliary agent, and the mass part of the auxiliary agent is recorded as d, wherein d is more than 0 and less than or equal to 15.

Preferably, the preparation method of the aqueous polyurethane/acrylate core-shell composite emulsion comprises the following steps:

(1) mixing diisocyanate, oligomer diol, a micromolecule chain extender, a hydrophilic chain extender and a catalyst, and carrying out a first polycondensation reaction to obtain a first polycondensation product system;

(2) mixing a first cross-linking agent with the first polycondensation product system, and carrying out a second polycondensation reaction to obtain a second polycondensation product system;

(3) mixing an end-capping reagent with the second polycondensation product system, and carrying out a third polycondensation reaction to obtain a polyurethane prepolymer;

(4) adding a part of acrylate monomers into the polyurethane prepolymer for swelling, then mixing the obtained material with triethylamine for neutralization reaction, dispersing the obtained neutralized product system into water, and emulsifying to obtain an aqueous polyurethane emulsion;

(5) mixing the residual acrylate monomer, the initiator, the emulsifier, the second cross-linking agent and water to obtain a pre-emulsion, dropwise adding the pre-emulsion into the aqueous polyurethane emulsion, and carrying out emulsion polymerization reaction to obtain the aqueous polyurethane/acrylate core-shell composite emulsion.

Preferably, the mass ratio of the diisocyanate, the oligomer diol, the small molecular chain extender, the hydrophilic chain extender and the catalyst in the step (1) is (10-20): (10-30): (1-8): (1.5-4): (0.01-0.1);

the temperature of the first polycondensation reaction is 70-90 ℃, and the time is 0.5-1.5 h; the first polycondensation reaction is carried out under the condition of stirring, and the rotating speed of the stirring is 300-450 r/min.

Preferably, the mass ratio of the first cross-linking agent to the small molecular chain extender in the step (2) is (0.5-2): (1-8);

the temperature of the second polycondensation reaction is 70-90 ℃, and the time is 0.5-1.5 h; the second polycondensation reaction is carried out under the condition of stirring, and the rotating speed of the stirring is 300-450 r/min.

Preferably, the mass ratio of the end-capping reagent to the oligomer diol in the step (3) is (1-8): 10-30;

the temperature of the third polycondensation reaction is 70-90 ℃, and the time is 0.5-1.5 h; and the third polycondensation reaction is carried out under the stirring condition, and the stirring rotating speed is 300-450 r/min.

Preferably, the mass ratio of part of the acrylate monomers, the triethylamine and the water in the step (4) is (10-30): (1-3): (50-150); the mass ratio of the partial acrylate monomers to the oligomer diol is (10-30): (10-30);

the temperature of the neutralization reaction is 20-60 ℃, and the time is 5-15 min; the neutralization reaction is carried out under the condition of stirring, and the rotating speed of the stirring is 300-450 r/min;

the emulsifying temperature is 20-60 ℃, and the time is 20-40 min; the emulsification is carried out under the stirring condition, and the stirring rotating speed is 1000-1200 r/min.

Preferably, the mass ratio of the initiator, the residual acrylate monomer, the emulsifier, the second cross-linking agent and the water in the step (5) is (0.1-1): (60-90): (0.2-1): (0.2-0.8): (10-50); the mass ratio of the residual acrylate monomers to the partial acrylate monomers is (60-90): (10-30);

the temperature of the emulsion polymerization reaction is 65-85 ℃, and the time is 2-5 h; the emulsion polymerization reaction is carried out under the stirring condition, and the stirring rotating speed is 300-450 r/min.

Preferably, the damping filler comprises one or more of wet sericite, phlogopite, biotite, paragonite, lepidolite, light calcium carbonate, heavy calcium carbonate, diatomite, talcum powder, graphite, silica, glass powder, rutile type titanium dioxide and silicon micropowder;

the conductive filler comprises one or more of conductive mica powder, carbon black, carbon nano tubes, graphene, metal oxide, polyacetylene, polythiophene, polypyrrole, polyaniline, polyphenylene and polyphenylene ethylene;

the flame-retardant filler comprises one or more of nitrogen and phosphorus flame retardants, aluminum hydroxide, magnesium hydroxide, antimony oxide, zinc borate, brucite, hydromagnesite-rhombohedral marble ore, hydrotalcite, montmorillonite and diatomite;

the auxiliary agent comprises one or more of a thickening agent, a defoaming agent, a curing agent, a flatting agent, a light stabilizer and a dispersing agent.

The invention provides a preparation method of the water-based damping coating with antistatic property, corrosion resistance and flame retardance, which comprises the following steps:

and mixing the waterborne polyurethane/acrylate core-shell composite emulsion, the damping filler, the conductive filler, the flame-retardant filler and the auxiliary agent to obtain the waterborne damping coating with antistatic property, corrosion resistance and flame retardance.

The invention provides the application of the water-based damping paint with antistatic property, anticorrosive property and flame retardant property in the technical scheme or the water-based damping paint with antistatic property, anticorrosive property and flame retardant property prepared by the preparation method in the technical scheme in the fields of rail trains, aerospace and automobile industries.

The invention provides an aqueous damping coating with antistatic property, corrosion resistance and flame retardance, which comprises the following components in parts by weight: 40-60 parts of waterborne polyurethane/acrylate core-shell composite emulsion, wherein the latex particles in the waterborne polyurethane/acrylate core-shell composite emulsion take polyurethane as a shell and polyacrylate as a core; the mass portion of the damping filler is marked as a, and a is more than 0 and less than or equal to 55; the conductive filler is marked as b by mass, and b is more than 0 and less than or equal to 30; the flame-retardant filler is marked as c by mass, wherein c is more than 0 and less than or equal to 30; and d is taken as the auxiliary agent, and the mass part of the auxiliary agent is recorded as d, wherein d is more than 0 and less than or equal to 15. The coating provided by the invention takes the waterborne polyurethane/acrylate core-shell composite emulsion as a basic emulsion, combines the excellent properties of polyurethane and polyacrylate, and is beneficial to improving the comprehensive properties of the coating; according to the invention, the damping filler, the conductive filler and the flame-retardant filler are introduced into the coating, so that the transmission and permeation of a medium can be effectively blocked, the internal friction of the coating is increased, the internal consumption is improved, the accumulation of charges can be avoided, the ignition point of the coating is improved, the coating has high damping performance, excellent antistatic property, corrosion resistance and flame retardant property, and the application field of the coating is widened. The coating provided by the invention uses water as a dispersion medium, and compared with the solvent type and asphalt type damping coatings widely applied at present, the coating provided by the invention belongs to an environment-friendly coating.

Drawings

FIG. 1 is a dynamic mechanical analysis chart of the waterborne damping coating with antistatic property, corrosion resistance and flame retardant property prepared in examples 3-7;

FIG. 2 is a dynamic mechanical analysis map of the waterborne damping coating with antistatic property, corrosion resistance and flame retardant property prepared in examples 11-15;

FIG. 3 is a scanning electron microscope cross-sectional view of a coating film formed by the waterborne damping coating with antistatic property, corrosion resistance and flame retardant property prepared in example 14.

Detailed Description

The invention provides an aqueous damping coating with antistatic property, corrosion resistance and flame retardance, which comprises the following components in parts by weight:

the conductive filler is marked as b by mass, and b is more than 0 and less than or equal to 30;

In the present invention, the starting materials are all commercially available products well known to those skilled in the art unless otherwise specified.

The waterborne damping coating with antistatic property, corrosion resistance and flame retardance provided by the invention takes the waterborne polyurethane/acrylate core-shell composite emulsion as the basic emulsion, combines the excellent properties of polyurethane and polyacrylate, and is beneficial to improving the comprehensive performance of the coating; according to the invention, the damping filler, the conductive filler and the flame-retardant filler are introduced into the coating, so that the transmission and permeation of a medium can be effectively blocked, the internal friction of the coating is increased, the internal consumption is improved, the effective transmission of electrons can be promoted, the accumulation of charges can be avoided, the heat required by the combustion of the coating is improved, and the ignition point is improved, so that the coating has high damping performance, and simultaneously has good antistatic performance, corrosion resistance and flame-retardant performance, and the application field of the coating is widened. The paint provided by the invention reduces inconvenience caused by a construction mode of layer-by-layer superposition, widens the application field of the paint, belongs to environment-friendly paint, and effectively avoids potential safety hazard.

The water-based damping coating with antistatic property, corrosion resistance and flame retardance provided by the invention comprises, by mass, 40-60 parts of water-based polyurethane/acrylate core-shell composite emulsion, preferably 45-55 parts, and further preferably 47-52 parts. In the invention, the latex particles in the waterborne polyurethane/acrylate core-shell composite emulsion take polyurethane as a shell and polyacrylate as a core. In the invention, the aqueous polyurethane/acrylate core-shell composite emulsion is specifically used as a film forming substance of a coating. In the invention, the preparation method of the aqueous polyurethane/acrylate core-shell composite emulsion preferably comprises the following steps:

Diisocyanate, oligomer diol, a micromolecule chain extender, a hydrophilic chain extender and a catalyst are mixed to carry out a first polycondensation reaction, so that a first polycondensation product system is obtained. In the invention, the diisocyanate preferably comprises one or more of toluene diisocyanate, dicyclohexylmethane diisocyanate, isophorone diisocyanate and tetramethylxylylene diisocyanate; the oligomer diol preferably comprises one or more of polyether diol, polyoxyethylene diol, polyoxypropylene diol and polytetrahydrofuran diol; the micromolecular chain extender preferably comprises one or more of ethylene glycol, hexanediol, octanediol, sebacic acid glycol, 1, 3-butanediol, 1, 4-butanediol and diethylene glycol; the hydrophilic chain extender preferably comprises dimethylolpropionic acid, dihydroxy half ester, sodium ethylene diamine sulfonate or diethylenetriamine; the catalyst preferably comprises one or more of dibutyltin dilaurate, stannous octoate and tin octoate. In the invention, the mass ratio of the diisocyanate, the oligomer diol, the small molecular chain extender, the hydrophilic chain extender and the catalyst is preferably (10-20): (10-30): (1-8): (1.5-4): (0.01-0.1), more preferably (12-16): (17-25): (1-6): (2-3.5): (0.03-0.07). In the invention, the temperature of the first polycondensation reaction is preferably 70-90 ℃, and more preferably 78-83 ℃; the time is preferably 0.5 to 1.5 hours, and more preferably 0.8 to 1.2 hours; the first polycondensation reaction is preferably carried out under the condition of stirring, and the rotating speed of the stirring is preferably 300-450 r/min, and more preferably 350-400 r/min.

After the first polycondensation product system is obtained, the first crosslinking agent is mixed with the first polycondensation product system to carry out the second polycondensation reaction, and the second polycondensation product system is obtained. In the present invention, the first crosslinking agent preferably includes one or more of trimethylolethane, trimethylolpropane, glycerol, and pentaerythritol. In the invention, the mass ratio of the first cross-linking agent to the small molecular chain extender is preferably (0.5-3): (1-8), more preferably (0.8-1.5): (1-6). In the invention, the temperature of the second polycondensation reaction is preferably 70-90 ℃, and more preferably 78-83 ℃; the second polycondensation reaction time is preferably 0.5-1.5 h, and more preferably 0.8-1.2 h; the second polycondensation reaction is preferably carried out under the condition of stirring, and the rotating speed of the stirring is preferably 300-450 r/min, and more preferably 350-400 r/min.

After a second polycondensation product system is obtained, the end-capping reagent is mixed with the second polycondensation product system to carry out a third polycondensation reaction, so as to obtain the polyurethane prepolymer. In the present invention, the blocking agent preferably includes one or more of hydroxyethyl acrylate, hydroxyethyl methacrylate (HEMA), hydroxypropyl acrylate, hydroxypropyl methacrylate, and methylol acrylamide. In the invention, the mass ratio of the end-capping agent to the oligomer diol is preferably (1-8) to (10-30), and more preferably (1.5-4): (17-25). In the invention, the temperature of the third polycondensation reaction is preferably 70-90 ℃, and more preferably 78-83 ℃; the time of the third polycondensation reaction is preferably 0.5-1.5 h, and more preferably 0.8-1.2 h; the third polycondensation reaction is preferably carried out under the condition of stirring, and the rotating speed of the stirring is preferably 300-450 r/min, and more preferably 350-400 r/min. The invention preferably adopts the end-capping reagent of the kind, carbon-carbon double bonds can be introduced at the tail end of the polyurethane prepolymer through the third polycondensation reaction, and in the subsequent reaction process, the carbon-carbon double bonds can be bonded with the acrylate monomer, so that the polyurethane and the polyacrylate in the finally obtained waterborne polyurethane/acrylate core-shell composite emulsion are organically combined in a chemical bond form, and the improvement of the comprehensive performance of the coating is facilitated.

After the polyurethane prepolymer is obtained, part of acrylate monomers are added into the polyurethane prepolymer for swelling, then the obtained material is mixed with triethylamine for neutralization reaction, and the obtained neutralization product system is dispersed in water for emulsification to obtain the waterborne polyurethane emulsion. In the present invention, the kind of the partial acrylate monomer preferably includes one or more of acrylic acid, methyl acrylate, ethyl acrylate, butyl acrylate, isooctyl acrylate, diethylhexyl acrylate, methyl methacrylate, butyl methacrylate and diethylhexyl methacrylate. In the invention, the mass ratio of the partial acrylate monomers, the triethylamine and the water is preferably (10-30): (1-3): (50-150), more preferably (15-30): (1.8-2.5): (80-120); the mass ratio of the partial acrylate monomers to the oligomer diol is preferably (10-40): (10-30), more preferably (15-35): (17-25). In the invention, the temperature of the neutralization reaction is preferably 20-60 ℃, and more preferably 35-45 ℃; the time of the neutralization reaction is preferably 5-15 min, and more preferably 8-12 min; the neutralization reaction is preferably carried out under the condition of stirring, and the rotating speed of the stirring is preferably 300-450 r/min, and more preferably 350-400 r/min. In the invention, the emulsifying temperature is preferably 20-60 ℃, and more preferably 35-45 ℃; the emulsifying time is preferably 20-40 min, and more preferably 25-35 min; the emulsification is preferably carried out under the condition of stirring, and the rotating speed of the stirring is preferably 1000-1200 r/min, and more preferably 1100-1200 r/min. According to the invention, water is preferably added into the neutralization product system, and the addition rate of the water is preferably 200-300 mL/min, and more preferably 200-230 mL/min. The emulsifying time of the invention is counted by the completion of water feeding.

After the waterborne polyurethane emulsion is obtained, mixing the residual acrylate monomer, the initiator, the emulsifier, the second cross-linking agent and water to obtain a pre-emulsion, dropwise adding the pre-emulsion into the waterborne polyurethane emulsion, and carrying out emulsion polymerization reaction to obtain the waterborne polyurethane/acrylate core-shell composite emulsion. In the invention, the initiator preferably comprises one or more of potassium persulfate, sodium persulfate, ammonium persulfate, benzoyl peroxide and azobisisobutyronitrile; the emulsifier preferably comprises one or more of sodium dodecyl sulfate, sodium dodecyl benzene sulfonate, potassium undecyl acetate, sodium dibutyl benzene sulfonate, sodium dibutyl naphthalene sulfonate and sodium dioctyl sulfosuccinate; the second crosslinking agent preferably comprises one or more of divinylbenzene, diethylene glycol diacrylate and diethylene glycol diacrylate. In the invention, the mass ratio of the initiator, the residual acrylate monomer, the emulsifier, the second cross-linking agent and water is (0.1-1): (60-90): (0.2-1): (0.2-0.8): (10-50), more preferably (0.4-0.7): (60-80): (0.3-0.6): (0.65-0.9): (23-30); the mass ratio of the residual acrylate monomers to the partial acrylate monomers is preferably (60-90): (10-30), more preferably (60-80): (15-35). In the invention, the temperature of the emulsion polymerization reaction is preferably 65-85 ℃, and more preferably 75-82 ℃; the time of the emulsion polymerization reaction is preferably 1-5 h, and more preferably 1.5-2.5 h; the emulsion polymerization reaction is carried out under the condition of stirring, and the rotating speed of the stirring is preferably 300-450 r/min, and more preferably 350-400 r/min. In the invention, the dripping speed of the pre-emulsion is preferably 0.5-1.5 mL/min, and more preferably 0.7-1.0 mL/min. The time of the emulsion polymerization reaction according to the invention is measured after the pre-emulsion has been added.

The water-based damping coating with antistatic property, corrosion resistance and flame retardance provided by the invention comprises damping filler, wherein the mass part of the damping filler is marked as a, and a is more than 0 and less than or equal to 55; the damping filler is preferably 5-50 parts, more preferably 10-35 parts, and further preferably 20-30 parts. In the invention, the damping filler preferably comprises one or more of wet sericite, phlogopite, biotite, paragonite, lepidolite, light calcium carbonate, heavy calcium carbonate, diatomite, talcum powder, graphite, silica, glass powder, rutile titanium dioxide and silicon micropowder; in the embodiment of the invention, wet-process sericite is specifically adopted, and the mesh number of the wet-process sericite is specifically 400 meshes. In the invention, the damping filler can increase the internal friction of the coating, and can convert kinetic energy into heat energy to dissipate when being acted by external force, thereby effectively improving the internal consumption of the coating and being beneficial to improving the damping performance of the coating; the invention preferably adopts the damping filler of the type, can effectively improve the damping performance of the coating and enables the coating to have excellent comprehensive performance.

Based on the mass portion of the waterborne polyurethane/acrylate core-shell composite emulsion, the waterborne damping coating with antistatic property, corrosion resistance and flame retardance provided by the invention comprises conductive filler, wherein the mass portion of the conductive filler is recorded as b, and b is more than 0 and less than or equal to 30; the conductive filler is preferably 2 to 25 parts, more preferably 2 to 15 parts, and further preferably 3 to 13 parts. In the present invention, the conductive filler preferably includes one or more of conductive mica powder, carbon black, carbon nanotubes, graphene, metal oxide, polyacetylene, polythiophene, polypyrrole, polyaniline, polyphenylene, and polyphenylene ethylene. In the invention, the conductive filler can be uniformly dispersed in the coating, so that effective sites for forming a conductive channel are increased, effective transmission of electrons is facilitated, and the antistatic property of the coating can be effectively improved; the conductive filler is preferably adopted, and the antistatic coating has the advantages that the antistatic performance can be endowed to the coating while other performances are not damaged, so that the comprehensive performance of the coating is improved, and the application field of the coating is widened.

Based on the mass parts of the waterborne polyurethane/acrylate core-shell composite emulsion, the waterborne damping coating with antistatic property, corrosion resistance and flame retardant property provided by the invention comprises a flame retardant filler, wherein the mass part of the flame retardant filler is marked as c, and c is more than 0 and less than or equal to 30; the flame-retardant filler is preferably 3-28 parts, more preferably 10-26 parts, and further preferably 15-25 parts. In the invention, the flame-retardant filler preferably comprises one or more of nitrogen-phosphorus flame retardants, aluminum hydroxide, magnesium hydroxide, antimony oxide, zinc borate, brucite, hydromagnesite-clinoheptlite, hydrotalcite, montmorillonite and diatomite. In the embodiment of the invention, a Doher-6003 model nitrogen-phosphorus flame retardant is specifically adopted. According to the invention, the flame-retardant filler can effectively improve the ignition point of the coating and endow the coating with higher flame-retardant property; the invention preferably adopts the flame-retardant filler, and has the advantages of improving the damping performance of the coating and effectively ensuring that the comprehensive performance of the coating meets the requirements of practical application.

The water-based damping coating with antistatic property, corrosion resistance and flame retardant property provided by the invention comprises an auxiliary agent by taking the mass part of the water-based polyurethane/acrylate core-shell composite emulsion as a reference, wherein the mass part of the auxiliary agent is marked as d, and d is more than 0 and less than or equal to 15. In the invention, the auxiliary agent preferably comprises one or more of a thickening agent, a defoaming agent, a curing agent, a flatting agent, a light stabilizer and a dispersing agent; the mass parts of the thickening agent are recorded as d1, 0< d1 is less than or equal to 5, and the thickening agent is preferably 0.2-1 part, more preferably 0.4-0.6 part; the mass portion of the defoaming agent is d2, d2 is more than 0 and less than or equal to 5, and the defoaming agent is preferably 0.5 to 1.5 parts, more preferably 0.6 to 1 part; the total mass part of the curing agent, the flatting agent, the light stabilizer and the dispersing agent is recorded as d3, d3 is more than 0 and less than or equal to 5, and the total mass part of the curing agent, the flatting agent, the light stabilizer and the dispersing agent is preferably 1-5 parts, more preferably 1-4.5 parts. In the invention, the thickener preferably comprises one or more of cellulose thickener, inorganic thickener, common alkali swelling thickener, associative alkali swelling thickener and associative thickener, the cellulose thickener preferably comprises hydroxymethyl cellulose, carboxymethyl cellulose, hydroxyethyl cellulose or hydroxypropyl cellulose, the inorganic thickener preferably comprises bentonite or attapulgite, and in the embodiment of the invention, the thickener of model DN-2078 is particularly adopted; the defoaming agent preferably comprises one or more of a surfactant defoaming agent, an organosilicon and resin composite defoaming agent, a paraffin defoaming agent and a mineral oil defoaming agent, and in the embodiment of the invention, the model D L-174 defoaming agent is specifically adopted; the curing agent preferably comprises one or more of an aliphatic amine curing agent, an aromatic amine curing agent, an amido amine curing agent, a latent curing amine curing agent and a urea substitute curing agent, and in the embodiment of the invention, a water-based isocyanate curing agent is specifically adopted; the leveling agent preferably comprises one or more of an acrylic leveling agent, an organic silicon leveling agent and a fluorocarbon leveling agent, and in the embodiment of the invention, a W-313 aqueous organic silicon leveling agent or a W-308 aqueous fluorocarbon modified acrylate leveling agent is specifically adopted; the light stabilizer preferably comprises one or more of a light shielding agent, an ultraviolet light absorber, a quencher, a free radical scavenger and a hydroxide decomposer, and in the embodiment of the invention, a TINUVIN 1130 benzotriazole ultraviolet light absorber or a light hindered amine light stabilizer TINUVIN 292 is specifically adopted; the dispersant preferably comprises one or more of inorganic dispersant, organic dispersant and polymer dispersant, and in the embodiment of the invention, W-4021 water-resistant dispersant or sodium pyrophosphate dispersant is specifically adopted.

In the invention, the mixing is preferably to add a thickening agent into the aqueous polyurethane/acrylate core-shell composite emulsion, and carry out first stirring and dispersing to obtain a first mixture; adding a defoaming agent into the first mixture, and carrying out second stirring dispersion to obtain a second mixture; sequentially adding a damping filler, a conductive filler and a flame-retardant filler into the second mixture, and performing third stirring dispersion on each filler to finally obtain a third mixture; and sequentially adding a curing agent, a flatting agent, a light stabilizer and a dispersing agent into the third mixture, and performing fourth stirring dispersion by adding one filler every time to obtain the water-based damping coating with antistatic property, corrosion resistance and flame retardance. In the invention, the rotation speed of the first stirring dispersion is preferably 300-600 r/min, more preferably 350-420 r/min, and the time is preferably 20-50 min, more preferably 30-40 min; the rotation speed of the second stirring dispersion is preferably 300-600 r/min, more preferably 350-420 r/min, and the time is preferably 20-50 min, more preferably 30-40 min; the rotating speed is preferably 500-800 r/min, more preferably 600-670 r/min independently during each third stirring and dispersing, and the time for each third stirring and dispersing is preferably 50-80 min, more preferably 55-65 min; the rotation speed is preferably 300-600 r/min, more preferably 600-650 r/min independently during each fourth stirring and dispersing, and the time for each fourth stirring and dispersing is preferably 20-60 min, more preferably 40-50 min.

The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. It should be apparent that the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the following examples, the mass of each raw material is expressed in parts by mass, and the weight thereof is not particularly limited, and may be "kg" or "g"; in the following examples, the specific rates of temperature decrease and temperature increase are not particularly limited, and may be performed according to a procedure well known in the art.

Example 1

The preparation method of the waterborne polyurethane/acrylate core-shell composite emulsion comprises the following steps:

in a three-neck flask equipped with a stirring device and a condensing device and filled with nitrogen protection, 12.5 parts of isophorone diisocyanate (IPDI), 2.25 parts of dimethylolpropionic acid (DMPA), 0.06 part of dibutyltin dilaurate (DBTDL), 19.15 parts of dried polytetrahydrofuran glycol (PTMG) and 1.48 parts of 1, 4-butanediol (1,4-BDO) are sequentially added, the mixture is subjected to polycondensation reaction for 1 hour under the conditions of nitrogen protection and constant temperature of 80 ℃ in an oil bath at the stirring speed of 370r/min, then 0.98 part of Trimethylolpropane (TMP) is added into the reaction system for reaction for 1 hour, then 2.1 parts of hydroxyethyl methacrylate (HEMA) is added for end capping, and the reaction is continued for 1 hour, so as to obtain the polyurethane prepolymer.

Cooling the system to 40 ℃, adding 6 parts of Methyl Methacrylate (MMA) and 24 parts of isooctyl acrylate (EHA) monomer to reduce the viscosity of the polyurethane prepolymer, after swelling for 1h, adding 2.25 parts of Triethylamine (TEA), carrying out neutralization reaction for 10min at the stirring speed of 370r/min, then adding 100 parts of deionized water at the speed of 200mL/min, and emulsifying at room temperature for 30min at the rotating speed of 1200r/min to obtain the aqueous polyurethane emulsion.

Reducing the stirring speed to 370r/min, heating the waterborne polyurethane emulsion to 75 ℃, sequentially adding 25 parts of deionized water, 0.46 part of Sodium Dodecyl Sulfate (SDS), 12.5 parts of MMA, 50 parts of EHA, 0.74 part of Divinylbenzene (DVB) and 0.55 part of potassium persulfate (KPS) into a single-neck flask, plugging a bottle mouth, rapidly shaking for 10min by hand to obtain a pre-emulsion, continuously dropwise adding the pre-emulsion into the waterborne polyurethane emulsion at the dropwise adding speed of 0.8mL/min, heating the system to 80 ℃ after the dropwise adding is finished, and carrying out polymerization reaction for 2h to obtain the waterborne polyurethane/acrylate (WPUA) core-shell composite emulsion.

Example 2:

the preparation of polyaniline comprises the following steps:

weighing 68.56 parts of dodecylbenzene sulfonic acid (DBSA) in a three-neck flask with a stirring device, adding 350 parts of deionized water, and continuously stirring for 30min under the condition of ice-water bath to obtain a dodecylbenzene sulfonic acid aqueous solution; weighing 13.97 parts of aniline (An) monomer, dropwise adding the aniline (An) monomer into a three-neck flask by using a separating funnel, and continuously stirring; then, 5.1 parts of Ammonium Persulfate (APS) is weighed and dissolved in 50 parts of deionized water, the solution is dropwise added into a three-neck flask at the speed of 0.8mL/min by using a peristaltic pump, after the dropwise addition is finished, the stirring speed of 370r/min is kept, and the reaction is continuously stirred for 24 hours under the condition of ice-water bath; and after the reaction is finished, repeatedly washing and centrifuging the dark green reaction product for several times until the pH value of the supernatant is close to neutral, drying in a vacuum drying oven at 60 ℃ for 24h, and grinding to powder to obtain the polyaniline.

Example 3

49.84 parts of the waterborne polyurethane/acrylate core-shell composite emulsion prepared in the example 1 are weighed, 0.448 part of a thickening agent (DN-2078) is added, the stirring speed is kept at 400r/min, 0.8 part of a defoaming agent (D L-174) is added after the stirring is continued for 30min, and the stirring is carried out for 30 min; then, 5.54 parts of damping filler (400-mesh wet-process sericite powder), 0.899 part of polyaniline prepared in example 2 and 3.75 parts of nitrogen-phosphorus flame retardant (Doher-6003) are added in sequence, and each raw material is stirred for 60min at the speed of 650 r/min; and finally, sequentially adding 0.6 part of W-313 water-based organic silicon flatting agent and 0.5 part of W-4021 water-resistant dispersing agent, and stirring each raw material at the speed of 600r/min for 40min to uniformly mix the components to obtain the water-based damping coating with antistatic property, corrosion resistance and flame retardance.

Example 4

49.84 parts of the waterborne polyurethane/acrylate core-shell composite emulsion prepared in the example 1 are weighed, 0.448 part of a thickening agent (DN-2078) is added, the stirring speed is kept at 400r/min, 1.5 parts of a defoaming agent (D L-174) is added after the stirring is continued for 30min, and the stirring is carried out for 30 min; then, 12.46 parts of damping filler (400-mesh wet-process sericite powder), 0.899 part of polyaniline prepared in example 2 and 3.75 parts of nitrogen-phosphorus flame retardant (Doher-6003) are added in sequence, and each raw material is stirred for 60min at the speed of 650 r/min; and finally, sequentially adding 0.6 part of W-313 water-based organic silicon flatting agent and 0.5 part of W-4021 water-resistant dispersing agent, and stirring each raw material at the speed of 600r/min for 40min to uniformly mix the components to obtain the water-based damping coating with antistatic property, corrosion resistance and flame retardance.

Example 5

49.84 parts of the waterborne polyurethane/acrylate core-shell composite emulsion prepared in the example 1 are weighed, 0.448 part of a thickening agent (DN-2078) is added, the stirring speed is kept at 400r/min, 1.5 parts of a defoaming agent (D L-174) is added after the stirring is continued for 30min, and the stirring is carried out for 30 min; then, 21.36 parts of damping filler (400-mesh wet-process sericite powder), 0.899 part of polyaniline prepared in example 2 and 3.75 parts of nitrogen-phosphorus flame retardant (Doher-6003) are added in sequence, and each raw material is stirred for 60min at the speed of 650r/min respectively after being added; and finally, sequentially adding 0.6 part of W-313 water-based organic silicon flatting agent and 0.5 part of W-4021 water-resistant dispersing agent, and stirring each raw material at the speed of 600r/min for 40min to uniformly mix the components to obtain the water-based damping coating with antistatic property, corrosion resistance and flame retardance.

Example 6

49.84 parts of the waterborne polyurethane/acrylate core-shell composite emulsion prepared in the example 1 are weighed, 0.448 part of a thickening agent (DN-2078) is added, the stirring speed is kept at 400r/min, 1.5 parts of a defoaming agent (D L-174) is added after the stirring is continued for 30min, and the stirring is carried out for 30 min; then, 33.23 parts of damping filler (400-mesh wet-process sericite powder), 0.899 part of polyaniline prepared in example 2 and 3.75 parts of nitrogen-phosphorus flame retardant (Doher-6003) are added in sequence, and each raw material is stirred for 60min at the speed of 650 r/min; and finally, sequentially adding 0.6 part of W-313 water-based organic silicon flatting agent and 0.5 part of W-4021 water-resistant dispersing agent, and stirring each raw material at the speed of 600r/min for 40min to uniformly mix the components to obtain the water-based damping coating with antistatic property, corrosion resistance and flame retardance.

Example 7

49.84 parts of the waterborne polyurethane/acrylate core-shell composite emulsion prepared in the example 1 are weighed, 0.448 part of a thickening agent (DN-2078) is added, the stirring speed is kept at 400r/min, 1.5 parts of a defoaming agent (D L-174) is added after the stirring is continued for 30min, and the stirring is carried out for 30 min; then 49.84 parts of damping filler (400-mesh wet-process sericite powder), 0.899 part of polyaniline prepared in example 2 and 3.75 parts of nitrogen-phosphorus flame retardant (Doher-6003) are added in sequence, and each raw material is stirred for 60min at the speed of 650 r/min; and finally, sequentially adding 0.6 part of W-313 water-based organic silicon flatting agent and 0.5 part of W-4021 water-resistant dispersing agent, and stirring each raw material at the speed of 600r/min for 40min to uniformly mix the components to obtain the water-based damping coating with antistatic property, corrosion resistance and flame retardance.

Example 8

49.84 parts of the waterborne polyurethane/acrylate core-shell composite emulsion prepared in the example 1 are weighed, 0.448 part of a thickening agent (DN-2078) is added, the stirring speed is kept at 400r/min, 1.5 parts of a defoaming agent (D L-174) is added after the stirring is continued for 30min, and the stirring is carried out for 30 min; then, 21.36 parts of damping filler (400-mesh wet-process sericite powder), 1.816 parts of polyaniline prepared in example 2 and 3.75 parts of nitrogen-phosphorus flame retardant (Doher-6003) are added in sequence, and each raw material is stirred for 60min at the speed of 650 r/min; and finally, sequentially adding 0.6 part of W-313 water-based organic silicon flatting agent and 0.5 part of W-4021 water-resistant dispersing agent, and stirring each raw material at the speed of 600r/min for 40min to uniformly mix the components to obtain the water-based damping coating with antistatic property, corrosion resistance and flame retardance.

Example 9

49.84 parts of the waterborne polyurethane/acrylate core-shell composite emulsion prepared in the example 1 are weighed, 0.448 part of a thickening agent (DN-2078) is added, the stirring speed is kept at 400r/min, 1.5 parts of a defoaming agent (D L-174) is added after the stirring is continued for 30min, and the stirring is carried out for 30 min; then, 21.36 parts of damping filler (400-mesh wet-process sericite powder), 2.753 parts of polyaniline conductive polymer prepared in example 2 and 3.75 parts of nitrogen-phosphorus flame retardant (Doher-6003) are added in sequence, and each raw material is stirred for 60min at the speed of 650 r/min; and finally, sequentially adding 0.6 part of W-313 water-based organic silicon flatting agent and 0.5 part of W-4021 water-resistant dispersing agent, and stirring each raw material at the speed of 600r/min for 40min to uniformly mix the components to obtain the water-based damping coating with antistatic property, corrosion resistance and flame retardance.

Example 10

49.84 parts of the waterborne polyurethane/acrylate core-shell composite emulsion prepared in the example 1 are weighed, 0.448 part of a thickening agent (DN-2078) is added, the stirring speed is kept at 400r/min, 1.5 parts of a defoaming agent (D L-174) is added after the stirring is continued for 30min, and the stirring is carried out for 30 min; then, 21.36 parts of damping filler (400-mesh wet-process sericite powder), 3.708 parts of polyaniline prepared in example 2 and 3.75 parts of nitrogen-phosphorus flame retardant (Doher-6003) are added in sequence, and each raw material is stirred for 60min at the speed of 650 r/min; and finally, sequentially adding 0.6 part of W-313 water-based organic silicon flatting agent and 0.5 part of W-4021 water-resistant dispersing agent, and stirring each raw material at the speed of 600r/min for 40min to uniformly mix the components to obtain the water-based damping coating with antistatic property, corrosion resistance and flame retardance.

Example 11

49.84 parts of the waterborne polyurethane/acrylate core-shell composite emulsion prepared in the example 1 are weighed, 0.448 part of a thickening agent (DN-2078) is added, the stirring speed is kept at 400r/min, 1.5 parts of a defoaming agent (D L-174) is added after the stirring is continued for 30min, and the stirring is carried out for 30 min; then, 21.36 parts of damping filler (400-mesh wet-process sericite powder), 4.684 parts of polyaniline prepared in example 2 and 3.75 parts of nitrogen-phosphorus flame retardant (Doher-6003) are added in sequence, and each raw material is stirred for 60min at the speed of 650 r/min; and finally, sequentially adding 0.6 part of W-313 water-based organic silicon flatting agent and 0.5 part of W-4021 water-resistant dispersing agent, and stirring each raw material at the speed of 600r/min for 40min to uniformly mix the components to obtain the water-based damping coating with antistatic property, corrosion resistance and flame retardance.

Example 12

49.84 parts of the waterborne polyurethane/acrylate core-shell composite emulsion prepared in the example 1 are weighed, 0.448 part of a thickening agent (DN-2078) is added, the stirring speed is kept at 400r/min, 1.5 parts of a defoaming agent (D L-174) is added after the stirring is continued for 30min, and the stirring is carried out for 30 min; then, 21.36 parts of damping filler (400-mesh wet-process sericite powder), 4.684 parts of polyaniline prepared in example 2 and 7.91 parts of nitrogen-phosphorus flame retardant (Doher-6003) are added in sequence, and each raw material is stirred for 60min at the speed of 650 r/min; and finally, sequentially adding 0.6 part of W-313 water-based organic silicon flatting agent and 0.5 part of W-4021 water-resistant dispersing agent, and stirring each raw material at the speed of 600r/min for 40min to uniformly mix the components to obtain the water-based damping coating with antistatic property, corrosion resistance and flame retardance.

Example 13

49.84 parts of the waterborne polyurethane/acrylate core-shell composite emulsion prepared in the example 1 are weighed, 0.448 part of a thickening agent (DN-2078) is added, the stirring speed is kept at 400r/min, 1.5 parts of a defoaming agent (D L-174) is added after the stirring is continued for 30min, and the stirring is carried out for 30 min; then, 21.36 parts of damping filler (400-mesh wet-process sericite powder), 4.684 parts of polyaniline prepared in example 2 and 12.56 parts of nitrogen-phosphorus flame retardant (Doher-6003) are added in sequence, and each raw material is stirred for 60min at the speed of 650 r/min; and finally, sequentially adding 0.6 part of W-313 water-based organic silicon flatting agent and 0.5 part of W-4021 water-resistant dispersing agent, and stirring each raw material at the speed of 600r/min for 40min to uniformly mix the components to obtain the water-based damping coating with antistatic property, corrosion resistance and flame retardance.

Example 14

49.84 parts of the waterborne polyurethane/acrylate core-shell composite emulsion prepared in the example 1 are weighed, 0.448 part of a thickening agent (DN-2078) is added, the stirring speed is kept at 400r/min, 1.5 parts of a defoaming agent (D L-174) is added after the stirring is continued for 30min, and the stirring is carried out for 30 min; then, 21.36 parts of damping filler (400-mesh wet-process sericite powder), 4.684 parts of polyaniline prepared in example 2 and 17.8 parts of nitrogen-phosphorus flame retardant (Doher-6003) are added in sequence, and each raw material is stirred for 60min at the speed of 650 r/min; and finally, sequentially adding 0.6 part of W-313 water-based organic silicon flatting agent and 0.5 part of W-4021 water-resistant dispersing agent, and stirring each raw material at the speed of 600r/min for 40min to uniformly mix the components to obtain the water-based damping coating with antistatic property, corrosion resistance and flame retardance.

Example 15

49.84 parts of the waterborne polyurethane/acrylate core-shell composite emulsion prepared in the embodiment 1 is weighed, 0.448 part of a thickening agent (DN-2078) is added, the stirring speed is kept at 400r/min, 1.5 parts of a defoaming agent (D L-174) is added after the continuous stirring for 30min, and the stirring is carried out for 30 min; then, 21.36 parts of damping filler (400-mesh wet-process sericite powder), 4.684 parts of polyaniline prepared in example 2 and 23.73 parts of nitrogen-phosphorus flame retardant (Doher-6003) are added in sequence, and each raw material is stirred for 60min at the speed of 650 r/min; and finally, sequentially adding 0.6 part of W-313 water-based organic silicon flatting agent and 0.5 part of W-4021 water-resistant dispersing agent, and stirring each raw material at the speed of 600r/min for 40min to uniformly mix the components to obtain the water-based damping coating with antistatic property, corrosion resistance and flame retardance.

Example 16

49.84 parts of the aqueous polyurethane/acrylate core-shell composite emulsion prepared in the example 1 are weighed, 0.315 part of a thickening agent (DN-2078) is added, the stirring speed is kept at 400r/min, 1.0 part of a defoaming agent (D L-174) is added after the continuous stirring for 30min, and the stirring is carried out for 30 min; then, 5.54 parts of damping filler (400-mesh wet-process sericite powder), 0.899 part of polyaniline prepared in example 2 and 3.75 parts of nitrogen-phosphorus flame retardant (Doher-6003) are added in sequence, and each raw material is stirred for 60min at the speed of 650 r/min; and finally, sequentially adding 1.2 parts of W-308 aqueous fluorocarbon modified acrylate flatting agent, 1.5 parts of TINUVIN 1130 benzotriazole ultraviolet absorbent and 1.7 parts of dispersant sodium pyrophosphate, and stirring at the speed of 600r/min for 40min after adding each raw material to uniformly mix the components to obtain the aqueous damping coating with antistatic property, corrosion resistance and flame retardance.

Example 17

49.84 parts of the waterborne polyurethane/acrylate core-shell composite emulsion prepared in the example 1 are weighed, 0.315 part of a thickening agent (DN-2078) is added, the stirring speed is kept at 400r/min, 1.2 parts of a defoaming agent (D L-174) is added after the stirring is continued for 30min, and the stirring is carried out for 30 min; then, 5.54 parts of damping filler (400-mesh wet-process sericite powder), 0.899 part of polyaniline prepared in example 2 and 3.75 parts of nitrogen-phosphorus flame retardant (Doher-6003) are added in sequence, and each raw material is stirred for 60min at the speed of 650 r/min; and finally, sequentially adding 1.0 part of water-based isocyanate curing agent, 1.0 part of W-308 water-based fluorocarbon modified acrylate leveling agent, 1.2 parts of TINUVIN 1130 benzotriazole ultraviolet absorbent and 1.3 parts of dispersant sodium pyrophosphate, and stirring each raw material at a speed of 600r/min for 40min to uniformly mix the components to obtain the water-based damping coating with antistatic property, corrosion resistance and flame retardance.

Example 18

49.84 parts of the waterborne polyurethane/acrylate core-shell composite emulsion prepared in the example 1 are weighed, 0.249 part of a thickener (DN-2078) is added, the stirring speed is kept at 400r/min, 0.8 part of a defoaming agent (D L-174) is added after the stirring is continued for 30min, and the stirring is carried out for 30 min; then, 5.54 parts of damping filler (400-mesh wet-process sericite powder), 0.899 part of polyaniline prepared in example 2 and 3.75 parts of nitrogen-phosphorus flame retardant (Doher-6003) are added in sequence, and each raw material is stirred for 60min at the speed of 650 r/min; and finally, sequentially adding 0.9 part of W-313 water-based organic silicon flatting agent, 0.9 part of light-hindered amine light stabilizer TINUVIN 2921.5 part and 1.0 part of polyacrylamide, and stirring each raw material at the speed of 600r/min for 40min to uniformly mix the components to obtain the water-based damping coating with antistatic property, anticorrosive property and flame retardant property.

Performance testing and characterization

Fig. 1 is a dynamic mechanical analysis map of the aqueous damping paint with antistatic property, corrosion resistance and flame retardant property prepared in examples 3-7, and it can be known from fig. 1 that the damping property of the aqueous damping paint shows a trend of increasing and then decreasing with the increase of the content of the damping filler wet sericite, wherein the effective damping temperature range (Tan δ ≥ 0.3) of the aqueous damping paint obtained in example 5 is 122.6 ℃, and the aqueous damping paint has a better damping effect.

FIG. 2 is a dynamic mechanical analysis chart of the waterborne damping coating with antistatic property, corrosion resistance and flame retardant property prepared in examples 11-15, and it can be known from FIG. 2 that the damping property of the waterborne damping coating shows a trend of increasing and then decreasing with the increase of the flame retardant filler Doher-6003, wherein the effective damping temperature range (Tan. delta. is greater than or equal to 0.3) of the waterborne damping coating obtained in example 14 is 137.48 ℃, and the waterborne damping coating has a better damping effect.

FIG. 3 is a scanning electron microscope cross-sectional view of a coating film formed by the waterborne damping coating with antistatic property, corrosion resistance and flame retardant property prepared in example 14, and it can be seen from FIG. 3 that the damping filler and the flame retardant filler are uniformly dispersed in the coating film and the compactness of the coating film is better.

Table 1 shows the results of the test on the appearance, corrosion resistance and static electricity resistance of the aqueous damping paint with static electricity resistance, corrosion resistance and flame retardant property prepared in examples 5 and 8 to 11, and it can be seen from table 1 that the corrosion resistance and static electricity resistance of the aqueous damping paint are increased with the increase of the content of polyaniline which is a conductive filler.

TABLE 1 Performance test results for waterborne damping coatings prepared in example 5 and examples 8-11

Table 2 shows the results of testing the appearance, corrosion resistance and flame retardancy of the waterborne damping coatings with antistatic property, corrosion resistance and flame retardancy prepared in examples 11 to 15, and it can be seen from table 2 that the flame retardancy of the waterborne damping coatings is continuously increased and the corrosion resistance and antistatic property are slightly reduced with the increase of the content of the flame retardant filler Doher-6003, but the requirements of practical application can be met.

TABLE 2 Performance test results of the waterborne damping coatings prepared in examples 11 to 15

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims

1. The water-based damping coating with antistatic property, corrosion resistance and flame retardance comprises the following components in parts by weight:

the flame-retardant filler is marked as c by mass, wherein c is more than 0 and less than or equal to 30;

2. The water-based damping paint with antistatic property, corrosion resistance and flame retardant property according to claim 1, wherein the preparation method of the water-based polyurethane/acrylate core-shell composite emulsion comprises the following steps:

(1) mixing diisocyanate, oligomer diol, a micromolecular chain extender, a hydrophilic chain extender and a catalyst, and carrying out a first polycondensation reaction to obtain a first polycondensation product system;

(5) mixing the residual acrylate monomer, the initiator, the emulsifier, the second cross-linking agent and water to obtain a pre-emulsion, dropwise adding the pre-emulsion into the waterborne polyurethane emulsion, and carrying out emulsion polymerization reaction to obtain the waterborne polyurethane/acrylate core-shell composite emulsion.

3. The water-based damping coating with antistatic property, corrosion resistance and flame retardant property as claimed in claim 2, wherein the mass ratio of the diisocyanate, the oligomer diol, the small molecular chain extender, the hydrophilic chain extender and the catalyst in the step (1) is (10-20): (10-30): (1-8): (1.5-4): (0.01 to 0.1);

4. The water-based damping coating with antistatic property, corrosion resistance and flame retardant property as claimed in claim 2, wherein the mass ratio of the first cross-linking agent to the small molecule chain extender in the step (2) is (0.5-2): (1-8);

5. The water-based damping paint with antistatic property, anticorrosion property and flame retardant property as claimed in claim 2, wherein the mass ratio of the end capping agent to the oligomer diol in the step (3) is (1-8) to (10-30);

6. The water-based damping paint with antistatic property, anticorrosive property and flame retardant property according to claim 2, wherein the mass ratio of the part of acrylate monomers, triethylamine and water in the step (4) is (10-30): (1-3): (50-150); the mass ratio of the partial acrylate monomers to the oligomer diol is (10-30): (10-30);

the temperature of the neutralization reaction is 20-60 ℃, and the time is 5-15 min; the neutralization reaction is carried out under the stirring condition, and the stirring rotating speed is 300-450 r/min;

7. The water-based damping coating with antistatic property, corrosion resistance and flame retardant property as claimed in claim 2, wherein the mass ratio of the initiator, the residual acrylate monomer, the emulsifier, the second cross-linking agent and the water in the step (5) is (0.1-1): (60-90): (0.2-1): (0.2-0.8): (10-50); the mass ratio of the residual acrylate monomers to the partial acrylate monomers is (60-90): (10-30);

8. The aqueous damping paint with antistatic, anticorrosive and flame retardant properties according to claim 1, wherein the damping filler comprises one or more of wet sericite, phlogopite, biotite, paragonite, lepidolite, light calcium carbonate, ground calcium carbonate, diatomaceous earth, talc, graphite, silica, glass powder, rutile titanium dioxide and silica micropowder;

9. The preparation method of the water-based damping coating with antistatic property, corrosion resistance and flame retardant property as claimed in any one of claims 1 to 8 comprises the following steps:

10. The application of the antistatic, anticorrosive and flame retardant water-based damping paint disclosed in any one of claims 1 to 8 or the antistatic, anticorrosive and flame retardant water-based damping paint prepared by the preparation method disclosed in claim 9 in the fields of rail trains, aerospace and automobile industries.