CN109913072B - Water-based coil steel repairing paint and preparation method thereof - Google Patents
Water-based coil steel repairing paint and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a water-based coil steel repairing paint and a preparation method thereof. The water-based coil steel repairing paint comprises a primer and a finish, wherein the primer comprises modified acrylic resin, a pH regulator, a film-forming auxiliary agent, a defoaming agent, a cross-linking agent, an anti-flash rust agent, a surfactant, a mildew preventive, a wetting agent, a thickening agent and water; the finish paint comprises modified acrylic resin, a pH regulator, a film-forming auxiliary agent, a defoaming agent, a dispersing agent, a cross-linking agent, an anti-flash rust agent, a filler, cellulose, a surfactant, a mildew preventive, a wetting agent, a thickening agent and water. The water-based coil steel repair paint provided by the invention has excellent water resistance, alkali resistance and quick drying property, so that the overall coil steel repair paint has excellent rusty construction capability, when the water-based coil steel repair paint is used for repairing coil steel, the substrate is simply treated, the surface rust removal grade reaches Sa1 grade, and the water-based coil steel repair paint can be coated by using conventional methods such as roll coating, spraying and the like, and is convenient to construct.
Description
Technical Field
The invention relates to a water-based coil steel repair paint and a preparation method thereof, belonging to the technical field of repair paints.
Background
Corrosion refers to the phenomenon of deterioration and destruction of materials under different environmental effects, and corrosion, particularly metal corrosion, can generate huge economic loss. According to statistics, 1/3 of the global steel yield per year is consumed due to corrosion, and national economic losses caused by metal corrosion in China are quite serious.
In order to avoid further corrosion of the material, the material is usually repaired by using repair paint, and the prior material repair process usually needs operations such as rust removal, oil stain removal and the like on a substrate, so that a large amount of manpower and material resources are consumed. Meanwhile, most of the existing refinishing paints are solvent-based, and a large amount of Volatile Organic Compounds (VOC) are discharged in the film forming process, so that the refinishing paints harm the health of people and pollute the ecological environment. With the requirement of environmental development and the issuance of environmental policies in various regions, the application prospect of the water-based repair paint is very wide, but the water-based repair paint still has some barriers, such as flash rust caused by high enthalpy value and insufficient corrosion resistance, so that the service life of the water-based repair paint is not as long as that of the traditional solvent-based repair paint.
The coil steel is a material commonly used in the building industry, the coating used on the surface of the coil steel in the current building is a common polyester coating, the service life is short, and the gloss of the coating is obviously reduced after 3 to 5 years, so that the protection effect and the decoration are lost. In addition, the existing coil steel coating is generally coated in two ways, defects can be generated on the surface of the coating due to improper construction or natural factors locally during protection, the penetration pressure of the inner part of a paint film is different from that of a damaged part due to rusting and damage caused by local defects, so that a corrosive medium can more easily contact the damaged edge position, large-area rusting near the defect of the paint film is caused, the paint film can be peeled off in serious cases, and the like, and serious economic loss is caused. Faced with such problems, it is often necessary to repair them with a refinish paint. However, the repair paint (such as epoxy ester industrial paint) commonly used in the market at present has weak rusted construction capability, and when coil steel is repaired, the repair construction can be carried out only when the base material derusting grade reaches Sa 21/2 grade, so that a large amount of manpower and financial resources are consumed.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a water-based coil steel repairing paint capable of being applied with rust and a preparation method thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
a water-based coil steel repairing paint, which comprises a primer and a finish,
the primer comprises the following components in percentage by weight:
the finish paint comprises the following components in percentage by weight:
the modified acrylic resin is obtained by modifying the acrylic resin in situ by titanium silicon nano particles.
As one embodiment, the titanium-silicon nano particle is coupling modified titanium dioxide and silicon dioxide, and is obtained by hydrolyzing tetrabutyl titanate, tetraethyl orthosilicate and a coupling agent (preferably gamma-methacryloxypropyltrimethoxysilane) in an acidic alcohol-water solution (preferably a glacial acetic acid-ethanol-water solution).
In one embodiment, the modified acrylic resin is obtained by reacting titanium-silicon nanoparticles with acrylic resin monomers pre-emulsified by an emulsifier in the presence of an initiator, wherein the titanium-silicon nanoparticles are obtained by hydrolyzing tetrabutyl titanate, tetraethyl orthosilicate and a coupling agent in an acidic alcohol-water solution (preferably an ethanol-water solution of glacial acetic acid).
Preferably, the preparation of the modified acrylic resin comprises the following steps:
a) mixing n-butyl titanate, tetraethyl orthosilicate and a coupling agent to obtain a titanium-silicon mixture;
b) dispersing a titanium-silicon mixture in an ethanol water solution to obtain a titanium-silicon mixed solution, adding 5-10 wt% of glacial acetic acid into the titanium-silicon mixed solution to adjust the pH of the solution to 3.5-5.5, and stirring at 30-50 ℃ until n-butyl titanate and tetraethyl orthosilicate are respectively hydrolyzed into titanium dioxide and silicon dioxide to obtain a titanium-silicon nano particle mixed solution;
c) adding an initiator into the mixed liquid of the titanium-silicon nano particles in the step b), and stirring to uniformly mix the initiator and the mixed liquid to obtain mixed liquid containing the initiator;
d) pre-emulsifying the acrylic resin monomer with an emulsifier to obtain an emulsified acrylic resin monomer;
e) slowly adding the emulsified acrylic resin monomer into the mixed solution containing the initiator in the step c), and then stirring and reacting for 1-5 hours at 70-90 ℃ to obtain the modified acrylic resin.
Preferably, in step a), n-butyl titanate: tetraethyl orthosilicate: the mass ratio of the coupling agent is (5-10): (70-85): (5-10).
Preferably, in step a), the coupling agent is a silane coupling agent, preferably gamma-methacryloxypropyltrimethoxysilane.
Preferably, in the step b), the ethanol aqueous solution is prepared by mixing water and ethanol in a mass ratio of 1: (3-5) mixing.
Preferably, in the step b), 1 part by mass of the titanium-silicon mixture is dispersed in 4-6 parts by mass of an aqueous solution of ethanol.
Preferably, in step c), the initiator is ammonium persulfate.
Preferably, the mass ratio of the titanium-silicon mixture to the initiator is 1: (0.2-0.5).
Preferably, in step d), the acrylic resin monomer is prepared from acrylic acid: styrene: methyl methacrylate: butyl acrylate: hydroxyethyl methacrylate is mixed with the following components in a mass ratio of (1-3): (20-40): (15-20): (20-25): (3-15) mixing.
Preferably, in the step d), the addition amount of the emulsifier is 0.05-0.1% of the mass of the acrylic resin monomer.
Preferably, in step d), the emulsifier is an op emulsifier.
Preferably, the mass ratio of the titanium-silicon mixture to the emulsified acrylic resin monomer is 10: 90-1: 99, in a ratio of 1: 90-1: preferably 99.
In one embodiment, the pH adjuster is an amine pH adjuster (e.g., 2-amino-2-methyl-1-propanol) or ammonia.
In one embodiment, the coalescing agent is 2,2, 4-trimethyl-1, 3-pentanediol monoisobutyrate, dibutyl maleate or dipropylene glycol butyl ether.
In one embodiment, the defoaming agent is an aqueous silicone-based defoaming agent, for example, a silicone-based or emulsified silicone-based aqueous silicone-based defoaming agent.
In one embodiment, the dispersant is a polymeric aqueous dispersant, preferably an acrylic polymeric aqueous dispersant, for example, an acrylic polymeric aqueous dispersant such as sodium salt of acrylic copolymer, ammonium polyacrylate, sodium polyacrylate, copolymer of vinyl ether and maleic acid (i.e., maleic acid), and sodium salt of copolymer of isobutylene and maleic acid.
In one embodiment, the crosslinking agent is a dual-functional crosslinking agent, such as adipic acid dihydrazide dual-functional compounds.
In one embodiment, the anti-flash rust agent is sodium nitrite or sodium molybdate.
In one embodiment, the filler is rutile titanium dioxide.
In one embodiment, the cellulose is hydroxyethyl cellulose.
In one embodiment, the surfactant is a nonionic surfactant, preferably a polyoxyethylene ether surfactant, such as polyoxyethylene ether, isomeric dodecyl alcohol polyoxyethylene ether, lauryl alcohol polyoxyethylene ether, and the like.
In one embodiment, the mildew inhibitor is chitosan.
In one embodiment, the humectant is propylene glycol or an alkyl naphthalene sulfonate.
In one embodiment, the thickener is a nonionic polyurethane thickener or an anionic hydrophobically modified acrylic acid alkali swellable thickener.
The method for preparing the water-based coil steel repair paint comprises the following steps:
a) preparing a primer: uniformly stirring and mixing the pH regulator, the defoaming agent, the water and the modified acrylic resin in proportion; then adding the film forming auxiliary agent in proportion, and stirring and mixing uniformly; then adding the cross-linking agent, the flash rust inhibitor and the mildew inhibitor in proportion, and stirring and mixing uniformly; then adding a wetting agent and a surfactant in a ratio, and stirring and mixing uniformly; finally, adding the thickening agent in proportion, and uniformly stirring and mixing to obtain the primer of the water-based coil steel repairing paint;
b) preparing a finish paint: uniformly stirring and mixing the pH regulator, the water and part of the defoaming agent in proportion; then adding the filler and the defoaming agent in the proportion amount, and stirring and mixing uniformly; then adding the modified acrylic resin and the film-forming assistant in proportion, and stirring and mixing uniformly; then adding a cross-linking agent, and stirring and mixing uniformly; then adding a wetting agent and a surfactant in a ratio, and stirring and mixing uniformly; and finally, adding the thickening agent in a proportion, and uniformly stirring and mixing to obtain the finish paint of the water-based coil steel repairing paint.
Preferably, in the preparation of the finish paint, when the filler and the defoaming agent are added according to the proportion, the stirring speed is 800-1200 r/min, and the fineness of the mixture is controlled to be less than 10 μm.
As a preferable scheme, in the preparation of the finish paint, the modified acrylic resin and the film-forming assistant in proportion are added after the stirring speed is reduced to 300-500 r/min.
Compared with the prior art, the invention has the following remarkable beneficial effects:
the repair paint disclosed by the invention takes the modified acrylic resin obtained by modifying the acrylic resin by the titanium-silicon nanoparticles as a matrix, takes water as a dispersion medium, and under the synergistic effect of various components (including the modified acrylic resin, a film forming additive, an anti-flash rust agent and other additives), the repair paint disclosed by the invention is green and environment-friendly, has no solvent pollution, has excellent performances such as alkali resistance, corrosion resistance, water resistance, quick drying and the like, has stronger rusty construction capability as a whole, can be used for repairing coil steel by only needing to perform repairing construction on the surface of a base material with the rust removal grade reaching the Sa1 grade (far lower than the traditional Sa 21/2 grade), has a wide application prospect, and has remarkable progress and unexpected effects; in addition, the preparation process is economical and practical, the preparation process is simple, the cost is low, special equipment and harsh conditions are not needed, large-scale production is easy to realize, and the preparation method has high practical value.
Detailed Description
The technical scheme of the invention is further detailed and completely explained by combining the embodiment.
Example 1
Firstly, preparing modified acrylic resin:
a) mixing n-butyl titanate: tetraethyl orthosilicate: gamma-methacryloxypropyltrimethoxysilane is added in a mass ratio of 10: 85: 5, mixing to obtain a titanium-silicon mixture for later use;
b) mixing water and ethanol according to the mass ratio of 1:5 to prepare an ethanol aqueous solution for later use; taking 1 part by mass of a titanium-silicon mixture, adding 6 parts by mass of an ethanol aqueous solution, stirring to disperse the titanium-silicon mixture in the ethanol aqueous solution to obtain a titanium-silicon mixed solution, then adding 5 wt% of glacial acetic acid into the titanium-silicon mixed solution to adjust the pH of the solution to 5.5, and then stirring and reacting for 5 hours at 30 ℃ until n-butyl titanate and tetraethyl orthosilicate are respectively hydrolyzed into titanium dioxide and silicon dioxide to obtain a titanium-silicon nano particle mixed solution;
c) adding 2 parts by mass of 10 wt% ammonium persulfate aqueous solution into the mixed solution of the titanium-silicon nanoparticles in the step b), and stirring to uniformly mix the solution to obtain mixed solution containing an initiator;
d) mixing acrylic acid, styrene, methyl methacrylate, butyl acrylate and hydroxyethyl methacrylate in a mass ratio of 1: 20: 40: 15: 24, obtaining an acrylic resin monomer, then adding an op emulsifier to pre-emulsify the acrylic resin monomer, wherein the amount of the added op emulsifier is 0.05 percent of the mass of the acrylic resin monomer, and obtaining an emulsified acrylic resin monomer for later use;
e) taking 90 parts by mass of emulsified acrylic resin monomer, slowly adding the emulsified acrylic resin monomer into the mixed solution containing the initiator in the step c), and then stirring and reacting for 3 hours at 70 ℃ to obtain the modified acrylic resin.
Secondly, preparing the water-based coil steel repairing paint:
respectively preparing a primer and a finish paint to prepare the water-based coil steel repairing paint, wherein:
the primer comprises the following components in percentage by weight:
preparing a primer: the pH regulator, the defoaming agent, the water and the modified acrylic resin in the proportion are stirred and mixed uniformly; then adding the film forming auxiliary agent in proportion, and stirring and mixing uniformly; then adding the cross-linking agent, the flash rust inhibitor and the mildew inhibitor in proportion, and stirring and mixing uniformly; then adding a wetting agent and a surfactant in a ratio, and stirring and mixing uniformly; finally, adding the thickening agent in proportion, and uniformly stirring and mixing to obtain the primer of the water-based coil steel repairing paint;
the finish paint comprises the following components in percentage by weight:
preparing a finish paint: the pH regulator, the water and the defoaming agent with the half proportion amount in the embodiment are stirred and mixed uniformly; then adding the filler with the proportion and the defoaming agent with the rest half proportion, controlling the stirring speed to be 1000 revolutions per minute, uniformly stirring and mixing, and controlling the fineness of the mixture to be below 10 mu m; then reducing the stirring speed to 400 r/min, adding the modified acrylic resin and the film-forming assistant in proportion, and stirring and mixing uniformly; then adding a cross-linking agent, and stirring and mixing uniformly; then adding a wetting agent and a surfactant in a ratio, and stirring and mixing uniformly; and finally, adding the thickening agent in a proportion, and uniformly stirring and mixing to obtain the finish paint of the water-based coil steel repairing paint.
When the prepared water-based coil steel repairing paint is actually applied, primer is coated firstly, and after the primer is coated, the surface of the primer needs to be dried and then the finish is coated.
In this example, the pH adjuster is 2-amino-2-methyl-1-propanol; the film-forming additive is 2,2, 4-trimethyl-1, 3-pentanediol monoisobutyrate; the defoaming agent is polydimethylsiloxane; the dispersant is poly (isobutylene-co-maleic acid) sodium salt; the cross-linking agent is adipic acid dihydrazide; the flash rust inhibitor is sodium nitrite; the filler is rutile titanium dioxide; the cellulose is hydroxyethyl cellulose; the surfactant is polyoxyethylene ether; the mildew preventive is chitosan; the wetting agent is propylene glycol; the thickening agent is a Dow nonionic polyurethane polymer thickening agent RM-8W.
Example 2
Firstly, preparing modified acrylic resin:
a) mixing n-butyl titanate: tetraethyl orthosilicate: gamma-methacryloxypropyltrimethoxysilane is added in a mass ratio of 15: 75: 10, mixing to obtain a titanium-silicon mixture for later use;
b) mixing water and ethanol according to the mass ratio of 1:4 to prepare an ethanol aqueous solution for later use; taking 1 part by mass of a titanium-silicon mixture, adding 5 parts by mass of an ethanol aqueous solution, stirring to disperse the titanium-silicon mixture in the ethanol aqueous solution to obtain a titanium-silicon mixed solution, then adding 8 wt% of glacial acetic acid into the titanium-silicon mixed solution to adjust the pH of the solution to 4.5, and then stirring and reacting for 3 hours at 40 ℃ until n-butyl titanate and tetraethyl orthosilicate are respectively hydrolyzed into titanium dioxide and silicon dioxide to obtain a titanium-silicon nano particle mixed solution;
c) adding 3.5 parts by mass of 10 wt% ammonium persulfate aqueous solution into the mixed solution of the titanium-silicon nanoparticles in the step b), and stirring to uniformly mix the mixture to obtain mixed solution containing an initiator;
d) mixing acrylic acid, styrene, methyl methacrylate, butyl acrylate and hydroxyethyl methacrylate in a mass ratio of 2: 30: 30: 20: 18 to obtain acrylic resin monomers, then adding an op emulsifier to pre-emulsify the acrylic resin monomers, wherein the amount of the added op emulsifier is 0.07 percent of the mass of the acrylic resin monomers, and obtaining emulsified acrylic resin monomers for later use;
e) taking 95 parts by mass of emulsified acrylic resin monomer, slowly adding the emulsified acrylic resin monomer into the mixed solution containing the initiator in the step c), and then stirring and reacting for 2.5 hours at 80 ℃ to obtain the modified acrylic resin.
Secondly, preparing the water-based coil steel repairing paint:
respectively preparing a primer and a finish paint to prepare the water-based coil steel repairing paint, wherein:
the primer comprises the following components in percentage by weight:
preparing a primer: the pH regulator, the defoaming agent, the water and the modified acrylic resin in the proportion are stirred and mixed uniformly; then adding the film forming auxiliary agent in proportion, and stirring and mixing uniformly; then adding the cross-linking agent, the flash rust inhibitor and the mildew inhibitor in proportion, and stirring and mixing uniformly; then adding a wetting agent and a surfactant in a ratio, and stirring and mixing uniformly; finally, adding the thickening agent in proportion, and uniformly stirring and mixing to obtain the primer of the water-based coil steel repairing paint;
the finish paint comprises the following components in percentage by weight:
preparing a finish paint: the pH regulator, the water and the defoaming agent with the half proportion amount in the embodiment are stirred and mixed uniformly; then adding the filler with the proportion and the defoaming agent with the rest half proportion, controlling the stirring speed to be 1000 revolutions per minute, uniformly stirring and mixing, and controlling the fineness of the mixture to be below 10 mu m; then reducing the stirring speed to 400 r/min, adding the modified acrylic resin and the film-forming assistant in proportion, and stirring and mixing uniformly; then adding a cross-linking agent, and stirring and mixing uniformly; then adding a wetting agent and a surfactant in a ratio, and stirring and mixing uniformly; and finally, adding the thickening agent in a proportion, and uniformly stirring and mixing to obtain the finish paint of the water-based coil steel repairing paint.
When the prepared water-based coil steel repairing paint is actually applied, primer is coated firstly, and after the primer is coated, the surface of the primer needs to be dried and then the finish is coated.
In this example, the pH adjuster is 2-amino-2-methyl-1-propanol; the film-forming additive is dibutyl maleate; the defoaming agent is emulsified silicone oil; the dispersant is sodium polyacrylate; the cross-linking agent is adipic acid dihydrazide; the flash rust inhibitor is sodium nitrite; the filler is rutile titanium dioxide; the cellulose is hydroxyethyl cellulose; the surfactant is polyoxyethylene lauryl ether; the mildew preventive is chitosan; the wetting agent is alkyl naphthalene sulfonate wetting agent 1004; the thickening agent is a Dow nonionic polyurethane polymer thickening agent RM-8W.
Example 3
Firstly, preparing modified acrylic resin:
a) mixing n-butyl titanate: tetraethyl orthosilicate: gamma-methacryloxypropyltrimethoxysilane is added in a mass ratio of 20: 70: 10, mixing to obtain a titanium-silicon mixture for later use;
b) mixing water and ethanol according to the mass ratio of 1:3 to prepare an ethanol aqueous solution for later use; taking 1 part by mass of a titanium-silicon mixture, adding 4 parts by mass of an ethanol aqueous solution, stirring to disperse the titanium-silicon mixture in the ethanol aqueous solution to obtain a titanium-silicon mixed solution, then adding 10 wt% of glacial acetic acid into the titanium-silicon mixed solution to adjust the pH of the solution to 3.5, and then stirring and reacting at 50 ℃ for 2 hours until n-butyl titanate and tetraethyl orthosilicate are respectively hydrolyzed into titanium dioxide and silicon dioxide to obtain a titanium-silicon nano particle mixed solution;
c) adding 5 parts by mass of 10 wt% ammonium persulfate aqueous solution into the mixed solution of the titanium-silicon nanoparticles in the step b), and stirring to uniformly mix the mixture to obtain mixed solution containing an initiator;
d) mixing acrylic acid, styrene, methyl methacrylate, butyl acrylate and hydroxyethyl methacrylate in a mass ratio of 3: 40: 20: 25: 12, mixing to obtain an acrylic resin monomer, and then adding an op emulsifier to pre-emulsify the acrylic resin monomer, wherein the amount of the added op emulsifier is 0.1 percent of the mass of the acrylic resin monomer, so as to obtain an emulsified acrylic resin monomer for later use;
e) taking 99 parts by mass of emulsified acrylic resin monomer, slowly adding the emulsified acrylic resin monomer into the mixed solution containing the initiator in the step c), and then stirring and reacting for 2 hours at 90 ℃ to obtain the modified acrylic resin
Secondly, preparing the water-based coil steel repairing paint:
respectively preparing a primer and a finish paint to prepare the water-based coil steel repairing paint, wherein:
the primer comprises the following components in percentage by weight:
preparing a primer: the pH regulator, the defoaming agent, the water and the modified acrylic resin in the proportion are stirred and mixed uniformly; then adding the film forming auxiliary agent in proportion, and stirring and mixing uniformly; then adding the cross-linking agent, the flash rust inhibitor and the mildew inhibitor in proportion, and stirring and mixing uniformly; then adding a wetting agent and a surfactant in a ratio, and stirring and mixing uniformly; finally, adding the thickening agent in proportion, and uniformly stirring and mixing to obtain the primer of the water-based coil steel repairing paint;
the finish paint comprises the following components in percentage by weight:
preparing a finish paint: the pH regulator, the water and the defoaming agent with the half proportion amount in the embodiment are stirred and mixed uniformly; then adding the filler with the proportion and the defoaming agent with the rest half proportion, controlling the stirring speed to be 1000 revolutions per minute, uniformly stirring and mixing, and controlling the fineness of the mixture to be below 10 mu m; then reducing the stirring speed to 400 r/min, adding the modified acrylic resin and the film-forming assistant in proportion, and stirring and mixing uniformly; then adding a cross-linking agent, and stirring and mixing uniformly; then adding a wetting agent and a surfactant in a ratio, and stirring and mixing uniformly; and finally, adding the thickening agent in a proportion, and uniformly stirring and mixing to obtain the finish paint of the water-based coil steel repairing paint.
When the prepared water-based coil steel repairing paint is actually applied, primer is coated firstly, and after the primer is coated, the surface of the primer needs to be dried and then the finish is coated.
In this example, the pH adjuster is 2-amino-2-methyl-1-propanol; the film-forming assistant is dipropylene glycol butyl ether; the defoaming agent is polydimethylsiloxane; the dispersant is poly (methyl vinyl ether copolymerized maleic acid); the cross-linking agent is adipic acid dihydrazide; the flash rust inhibitor is sodium nitrite; the filler is rutile titanium dioxide; the cellulose is hydroxyethyl cellulose; the surfactant is polyoxyethylene ether; the mildew preventive is chitosan; the wetting agent is propylene glycol; the thickening agent is a Dow nonionic polyurethane polymer thickening agent RM-8W.
The properties of the water-based coil steel repair paint prepared in examples 1-3 of the present invention were compared with those of a conventional epoxy ester industrial paint, and the dry film thickness ratio of the primer to the topcoat was 2:1, with the results shown in table 1.
TABLE 1 Performance test data for the waterborne coil repair paints of examples 1-3 and conventional epoxy ester industrial paints
As can be seen from table 1: the water-based coil steel repair paint provided by the invention has excellent adhesive force and paint film flexibility, and all physical indexes of the paint film accord with national relevant standards, particularly, compared with common epoxy ester industrial paint, the water-based coil steel repair paint provided by the invention has excellent water resistance, alkali resistance and quick drying property, so that the overall paint has excellent rusty construction capability, when the paint is used for repairing coil steel, a base material is simply treated, the surface rust removal grade of the base material reaches Sa1 grade, and the paint can be constructed by using conventional construction means such as roller coating, spraying and the like, and the construction is convenient.
Finally, it should be pointed out here that: the above is only a part of the preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention, and the insubstantial modifications and adaptations of the present invention by those skilled in the art based on the above description are intended to be covered by the present invention.
Claims (9)
1. The water-based coil steel repairing paint comprises a primer and a finish paint, and is characterized in that the primer comprises the following components in parts by weight:
the modified acrylic resin is obtained by modifying the acrylic resin in situ by titanium silicon nano particles.
2. The water-based coil steel refinishing paint according to claim 1, characterized in that: the modified acrylic resin is obtained by reacting titanium-silicon nano particles with an acrylic resin monomer pre-emulsified by an emulsifier in the presence of an initiator, wherein the titanium-silicon nano particles are obtained by hydrolyzing n-butyl titanate, tetraethyl orthosilicate and a coupling agent in an acidic alcohol-water solution.
3. The water-based coil steel repair paint as claimed in claim 2, wherein the preparation of the modified acrylic resin comprises the following steps:
a) mixing n-butyl titanate, tetraethyl orthosilicate and a coupling agent to obtain a titanium-silicon mixture;
b) dispersing a titanium-silicon mixture in an ethanol water solution to obtain a titanium-silicon mixed solution, adding 5-10 wt% of glacial acetic acid into the titanium-silicon mixed solution to adjust the pH of the solution to 3.5-5.5, and stirring at 30-50 ℃ until n-butyl titanate and tetraethyl orthosilicate are respectively hydrolyzed into titanium dioxide and silicon dioxide to obtain a titanium-silicon nano particle mixed solution;
c) adding an initiator into the mixed liquid of the titanium-silicon nano particles in the step b), and stirring to uniformly mix the initiator and the mixed liquid to obtain mixed liquid containing the initiator;
d) pre-emulsifying the acrylic resin monomer with an emulsifier to obtain an emulsified acrylic resin monomer;
e) slowly adding the emulsified acrylic resin monomer into the mixed solution containing the initiator in the step c), and then stirring and reacting for 1-5 hours at 70-90 ℃ to obtain the modified acrylic resin.
4. The water-based coil steel refinishing paint according to claim 3, wherein: in step a), n-butyl titanate: tetraethyl orthosilicate: the mass ratio of the coupling agent is (5-10): (70-85): (5-10).
5. The water-based coil steel refinishing paint according to claim 3, wherein: in the step a), the coupling agent is a silane coupling agent.
6. The water-based coil steel refinishing paint according to claim 3, wherein: in step d), the acrylic resin monomer is prepared from acrylic acid: styrene: methyl methacrylate: butyl acrylate: hydroxyethyl methacrylate is mixed with the following components in a mass ratio of (1-3): (20-40): (15-20): (20-25): (3-15) mixing.
7. The water-based coil steel refinishing paint according to claim 3, wherein: the mass ratio of the titanium-silicon mixture to the emulsified acrylic resin monomer is 10: 90-1: 99.
8. the water-based coil steel refinishing paint according to claim 1, characterized in that: the film-forming auxiliary agent is 2,2, 4-trimethyl-1, 3-pentanediol monoisobutyrate, dibutyl maleate or dipropylene glycol butyl ether; the defoaming agent is a water-based organic silicon defoaming agent; the cross-linking agent is a dual-functional group cross-linking agent.
9. The water-based coil steel refinishing paint according to claim 1, characterized in that: the thickening agent is a nonionic polyurethane thickening agent or an anionic hydrophobic modified acrylic acid alkali swelling thickening agent.
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| CN112646448A (en) * | 2020-12-21 | 2021-04-13 | 河北嘉宝莉涂料有限公司 | Water-based exterior wall coating and preparation method thereof |
| CN112778867A (en) * | 2020-12-28 | 2021-05-11 | 昆山大世界油墨涂料有限公司 | Water-based acrylic finish paint for corrosion prevention of steel plate and preparation method thereof |
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| CN109181452A (en) * | 2018-11-12 | 2019-01-11 | 西安鸿钧睿泽新材料科技有限公司 | A kind of transformant waterborne rusted paint and preparation method thereof |
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2019
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| EP2754700A1 (en) * | 2013-01-11 | 2014-07-16 | Vestocor GmbH | Paint system for areas subject to risk of explosion with a high corrosive load |
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| CN107586493A (en) * | 2016-07-06 | 2018-01-16 | 赫普有限公司 | Water based primer compositions, the priming paint obtained by it and the double-deck system containing the priming paint |
| CN106519107A (en) * | 2016-10-31 | 2017-03-22 | 湖南航天三丰科工有限公司 | Nanoparticle-modified acrylate emulsion and preparation method and application thereof |
| CN109181452A (en) * | 2018-11-12 | 2019-01-11 | 西安鸿钧睿泽新材料科技有限公司 | A kind of transformant waterborne rusted paint and preparation method thereof |
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