CN112143342A - Metal protective coating and preparation method thereof - Google Patents
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
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- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/08—Anti-corrosive paints
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- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/18—Fireproof paints including high temperature resistant paints
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- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/20—Diluents or solvents
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
- C09D7/62—Additives non-macromolecular inorganic modified by treatment with other compounds
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- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/63—Additives non-macromolecular organic
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- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/65—Additives macromolecular
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/80—Processes for incorporating ingredients
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/32—Phosphorus-containing compounds
- C08K2003/321—Phosphates
- C08K2003/328—Phosphates of heavy metals
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
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Abstract
The invention discloses a metal protective coating, which is prepared by the following method: adding water-based epoxy resin into deionized water, stirring, heating, adding acrylic resin emulsion, and performing microwave treatment to obtain a coating base solution; adding fatty acid triglyceride into the coating base liquid, stirring, heating, adding polyurethane resin, performing microwave treatment, adding organic modified zirconium phosphate and zinc stearate, and uniformly mixing to obtain a coating emulsion; and adding the organic silicon defoaming agent into the coating emulsion, uniformly mixing, cooling, and stirring at a high speed to obtain the metal protective coating. The invention has good mechanical property, good cohesiveness, toughness and heat resistance, and the coating has good water resistance and corrosion resistance after being soaked in water or baked at high temperature for a long time, thereby improving the protective property of the coating to metal.
Description
Technical Field
The invention relates to a metal protective coating and a preparation method thereof, belonging to the technical field of protective coatings.
Background
The metal material is widely applied to various fields such as buildings, traffic, national defense and the like, but the metal is easy to generate chemical action with the surrounding environment in the using process so that the metal is corroded, the corrosion is an increasingly serious problem, and the metal corrosion causes great resource waste all the year around. In order to solve this problem, the protection of metal substrates has been extensively studied, and among them, epoxy resin coatings are increasingly receiving attention for metal protection.
The epoxy resin coating comprises an oily epoxy resin coating and a water-based epoxy resin coating, the oily epoxy resin coating pollutes the environment and is harmful to human bodies, and the environment-friendly water-based epoxy resin coating is gradually developed, but the water-based epoxy coating in practical application also has certain defects: the coating has low cohesiveness, low toughness and weak heat resistance, and simultaneously, the coating generates bubbles, even cracks and falls off after being soaked in water or baked at high temperature for a long time, so that the water resistance and the corrosion resistance of the coating are reduced, and the protective performance to metal is low.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a metal protective coating which has good mechanical property, good cohesiveness, toughness and heat resistance, and the coating has good water resistance and corrosion resistance after being soaked in water or baked at high temperature for a long time, thereby improving the protective performance of the coating on metal.
In order to achieve the purpose, the invention adopts the following technical scheme: the metal protective coating comprises the following raw materials in parts by weight: 60-90 parts of water-based epoxy resin, 20-35 parts of acrylic resin emulsion, 10-15 parts of polyurethane resin, 15-25 parts of deionized water, 5-10 parts of triglyceride of fatty acid, 2-3.5 parts of organically modified zirconium phosphate, 1-3.5 parts of zinc stearate and 0.2-0.8 part of organic silicon defoamer;
the metal protective coating is prepared by the following method: adding water-based epoxy resin into deionized water, stirring, heating, adding acrylic resin emulsion, and performing microwave treatment to obtain a coating base solution; adding fatty acid triglyceride into the coating base liquid, stirring, heating, adding polyurethane resin, performing microwave treatment, adding organic modified zirconium phosphate and zinc stearate, and uniformly mixing to obtain a coating emulsion; and adding the organic silicon defoaming agent into the coating emulsion, uniformly mixing, cooling, and stirring at a high speed to obtain the metal protective coating.
The metal protective coating comprises the following raw materials in parts by weight: 80 parts of water-based epoxy resin, 28 parts of acrylic resin emulsion, 12 parts of polyurethane resin, 20 parts of deionized water, 8 parts of fatty acid triglyceride, 3 parts of organic modified zirconium phosphate, 2.5 parts of zinc stearate and 0.5 part of organic silicon defoamer.
Wherein, the preparation of the organic modified zirconium phosphate comprises the following steps: adding 5 parts of gamma-zirconium phosphate into 100 parts of deionized water, stirring and dispersing for 6-7 hours at the rotating speed of 800-1200 r/min, then stirring and heating to 35-40 ℃, adding 4 parts of low molecular weight polyetheramine, reacting for 10-12 hours, filtering, washing, and drying at the temperature of 55-65 ℃ to obtain the organic modified zirconium phosphate.
Wherein, the preparation of the organic silicon defoaming agent comprises the following steps: mixing 12 parts of dimethyl silicone oil and 4 parts of linolenic acid, stirring and mixing uniformly at the rotation speed of 1000-1500 r/min, heating to 75-85 ℃, introducing nitrogen for protection, adding 0.7 part of nano silicon dioxide, stirring for 20-30 min, adding 5.5 parts of polyether silicone oil, stirring for 30-35 min at the rotation speed of 1500-2000 r/min, reducing the temperature to 40-45 ℃, stirring for 10-15 min at the rotation speed of 1000-1500 r/min, heating to 55-65 ℃, adding 0.3 part of ammonium glycyrrhizate within 5-10 min of stirring, reducing the temperature to 30-35 ℃, and stirring for 15-20 min at the rotation speed of 1000-1500 r/min to obtain the organic silicon defoaming agent.
The invention relates to a preparation method of a metal protective coating, which specifically comprises the following steps:
s1, respectively carrying out superfine grinding on the water-based epoxy resin, the polyurethane resin, the zinc stearate and the organic modified zirconium phosphate in a superfine grinder to respectively obtain water-based epoxy resin micropowder, polyurethane resin micropowder, zinc stearate micropowder and organic modified zirconium phosphate micropowder;
s2, adding aqueous epoxy resin micro powder into deionized water, stirring for 30-35 min at the rotating speed of 1500-2000 r/min, heating to 55-65 ℃, adding acrylic resin emulsion, and stirring for a period of time under microwave to obtain a coating base liquid;
s3, adding fatty acid triglyceride into the coating base liquid, stirring for 15-20 min at the rotating speed of 2000-2500 r/min, heating to 65-75 ℃, adding polyurethane resin, stirring for a period of time under microwave, adding organic modified zirconium phosphate and zinc stearate, and mixing uniformly to obtain a coating emulsion;
s4, adding the organic silicon defoaming agent into the coating emulsion, uniformly mixing, reducing the temperature to 35-40 ℃, and stirring for 50-55 min at the rotating speed of 3000-3500 r/min to obtain the metal protection coating.
Wherein the microwave processing conditions in step S2 are: stirring for 40-45 min under the condition of microwave power of 1000-1500W.
Wherein the microwave processing conditions in step S3 are: stirring for 30-35 min under the condition of microwave power of 700-1000W.
The invention has the beneficial effects that:
1) the water-based epoxy resin and acrylic resin emulsion are used as raw materials of the coating, and are combined with the polyurethane resin, so that the coating has good mechanical properties, the cohesiveness, toughness and heat resistance of the coating are greatly improved, and the water resistance and corrosion resistance of the coating are improved; the coating is coated on a metal product, and the coating is soaked in water or baked at high temperature for a long time, so that the coating does not have the phenomena of foaming, cracking and falling, and the protective performance of the coating on the metal is improved.
2) The organic silicon defoamer is prepared from dimethyl silicone oil, linolenic acid and polyether silicone oil, has good stability and strong defoaming capability, and can relieve the strong hydrophobic and oleophobic properties of the defoamer by adding ammonium glycyrrhizinate; the coating is added into the coating, so that the stability is good, and the coating can be effectively prevented from foaming after being soaked in water or baked at high temperature for a long time.
3) The polyether amine is reacted with the gamma-zirconium phosphate to functionalize the gamma-zirconium phosphate to obtain the organic modified zirconium phosphate, and in the coating, the stability is good, the corrosion resistance, the wear resistance and the impact resistance of the coating are improved, and meanwhile, the heat resistance and the adhesiveness of the coating are further improved.
4) The invention takes water and fatty acid triglyceride as solvent, is environment-friendly, safe and nontoxic, and can be used safely.
5) The preparation process adopts microwave treatment, so that the combination of the water-based epoxy resin, the acrylic resin emulsion and the polyurethane resin is more stable, the compactness of the coating is improved, and the comprehensive properties of the coating, such as water resistance, adhesiveness, high temperature resistance and the like, are further improved.
Detailed Description
In order to more clearly and completely illustrate the present invention, the following examples are given by way of illustration of the present invention, and are not intended to limit the present invention.
Example 1
Preparing organic modified zirconium phosphate: adding 5 parts of gamma-zirconium phosphate into 100 parts of deionized water, stirring and dispersing for 6-7 hours at the rotating speed of 800-1200 r/min, then stirring and heating to 35-40 ℃, adding 4 parts of low molecular weight polyetheramine, reacting for 10-12 hours, filtering, washing, and drying at the temperature of 55-65 ℃ to obtain the organic modified zirconium phosphate.
Example 2
Preparation of the organic silicon defoamer: mixing 12 parts of dimethyl silicone oil and 4 parts of linolenic acid, stirring and mixing uniformly at the rotation speed of 1000-1500 r/min, heating to 75-85 ℃, introducing nitrogen for protection, adding 0.7 part of nano silicon dioxide, stirring for 20-30 min, adding 5.5 parts of polyether silicone oil, stirring for 30-35 min at the rotation speed of 1500-2000 r/min, reducing the temperature to 40-45 ℃, stirring for 10-15 min at the rotation speed of 1000-1500 r/min, heating to 55-65 ℃, adding 0.3 part of ammonium glycyrrhizate within 5-10 min of stirring, reducing the temperature to 30-35 ℃, and stirring for 15-20 min at the rotation speed of 1000-1500 r/min to obtain the organic silicon defoaming agent.
Example 3
The metal protective coating comprises the following raw materials in parts by weight: 60 parts of water-based epoxy resin, 20 parts of acrylic resin emulsion, 10 parts of polyurethane resin, 15 parts of deionized water, 5 parts of fatty acid triglyceride, 2 parts of organic modified zirconium phosphate, 1 part of zinc stearate and 0.2 part of organic silicon defoamer; wherein, the organic modified zirconium phosphate is prepared from the example 1, and the organic silicon defoamer is prepared from the example 2.
The preparation of the coating comprises the following steps:
s1, respectively carrying out superfine grinding on the water-based epoxy resin, the polyurethane resin, the zinc stearate and the organic modified zirconium phosphate in a superfine grinder to respectively obtain water-based epoxy resin micropowder, polyurethane resin micropowder, zinc stearate micropowder and organic modified zirconium phosphate micropowder;
s2, adding aqueous epoxy resin micro powder into deionized water, stirring for 30-35 min at a rotating speed of 1500-2000 r/min, heating to 55-65 ℃, adding acrylic resin emulsion, and stirring for 40-45 min at a microwave power of 1000-1500W to obtain a coating base liquid;
s3, adding fatty acid triglyceride into the coating base liquid, stirring for 15-20 min at the rotating speed of 2000-2500 r/min, heating to 65-75 ℃, adding polyurethane resin, stirring for 30-35 min at the microwave power of 700-1000W, adding organic modified zirconium phosphate and zinc stearate, and mixing uniformly to obtain a coating emulsion;
s4, adding the organic silicon defoaming agent into the coating emulsion, uniformly mixing, reducing the temperature to 35-40 ℃, and stirring for 50-55 min at the rotating speed of 3000-3500 r/min to obtain the metal protection coating.
Through tests, the metal protective coating has good mechanical properties such as adhesion, heat resistance, corrosion resistance, wear resistance, impact resistance and the like.
Example 4
The metal protective coating comprises the following raw materials in parts by weight: 80 parts of water-based epoxy resin, 28 parts of acrylic resin emulsion, 12 parts of polyurethane resin, 20 parts of deionized water, 8 parts of fatty acid triglyceride, 3 parts of organic modified zirconium phosphate, 2.5 parts of zinc stearate and 0.5 part of organic silicon defoamer; wherein, the organic modified zirconium phosphate is prepared from the example 1, and the organic silicon defoamer is prepared from the example 2.
The preparation process was the same as that of example 3.
Through tests, the metal protective coating has good mechanical properties such as adhesion, heat resistance, corrosion resistance, wear resistance, impact resistance and the like.
Example 5
The metal protective coating comprises the following raw materials in parts by weight: 90 parts of water-based epoxy resin, 35 parts of acrylic resin emulsion, 15 parts of polyurethane resin, 25 parts of deionized water, 10 parts of triglyceride of fatty acid, 3.5 parts of organic modified zirconium phosphate, 3.5 parts of zinc stearate and 0.8 part of organic silicon defoamer, wherein the organic modified zirconium phosphate is prepared in example 1, and the organic silicon defoamer is prepared in example 2.
The preparation process was the same as that of example 3.
Through tests, the metal protective coating has good mechanical properties such as adhesion, heat resistance, corrosion resistance, wear resistance, impact resistance and the like.
Example 6
Taking six metal pipelines, wherein two metal pipelines are coated with the metal protective coating prepared in the embodiment 3, two metal pipelines are coated with the metal protective coating prepared in the embodiment 4, two metal pipelines are coated with the metal protective coating prepared in the embodiment 5, and then the metal pipelines are placed into a drying room at the temperature of 45-60 ℃ to be dried and formed into a film, and then the temperature is reduced to the room temperature.
Two metal pipelines coated with the metal protective coating prepared in the embodiment 3 are used, wherein one metal pipeline is placed in water and soaked for 30 days, and the other metal pipeline is placed in a high-temperature chamber with the temperature of 250-300 ℃ for 7 days; two metal pipelines coated with the metal protective coating prepared in the embodiment 4 are used, wherein one metal pipeline is placed in water and soaked for 30 days, and the other metal pipeline is placed in a high-temperature chamber with the temperature of 250-300 ℃ for 7 days; two metal pipelines coated with the metal protective coating prepared in the embodiment 4 are used, wherein one metal pipeline is placed in water and soaked for 30 days, and the other metal pipeline is placed in a high-temperature chamber with the temperature of 250-300 ℃ for 7 days; and then the coating is taken out respectively, observation and test are carried out on the six metal pipelines, the coating does not have the phenomena of bubbling, cracking and falling, then the six metal pipelines are placed in air at room temperature for 7d, 15d and 30d, and the corrosion phenomenon does not occur in the six metal pipelines through observation, so that the coating has good protective performance on metal.
The metal protective coating prepared by the invention has good mechanical properties, greatly improves the cohesiveness, toughness and heat resistance of the coating, and improves the water resistance and corrosion resistance of the coating; the coating is coated on a metal product, and the coating is soaked in water or baked at high temperature for a long time, so that the coating does not have the phenomena of foaming, cracking and falling, and the protective performance of the coating on the metal is improved.
Finally, it should be noted that the above embodiments are only used for illustrating and not limiting the technical solutions of the present invention, and although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made to the present invention without departing from the spirit and scope of the present invention, and all modifications or partial substitutions should be covered by the scope of the claims of the present invention.
Claims (7)
1. The metal protective coating is characterized by comprising the following raw materials in parts by weight: 60-90 parts of water-based epoxy resin, 20-35 parts of acrylic resin emulsion, 10-15 parts of polyurethane resin, 15-25 parts of deionized water, 5-10 parts of triglyceride of fatty acid, 2-3.5 parts of organically modified zirconium phosphate, 1-3.5 parts of zinc stearate and 0.2-0.8 part of organic silicon defoamer;
the metal protective coating is prepared by the following method: adding water-based epoxy resin into deionized water, stirring, heating, adding acrylic resin emulsion, and performing microwave treatment to obtain a coating base solution; adding fatty acid triglyceride into the coating base liquid, stirring, heating, adding polyurethane resin, performing microwave treatment, adding organic modified zirconium phosphate and zinc stearate, and uniformly mixing to obtain a coating emulsion; and adding the organic silicon defoaming agent into the coating emulsion, uniformly mixing, cooling, and stirring at a high speed to obtain the metal protective coating.
2. The metal protective coating as claimed in claim 1, wherein the metal protective coating comprises the following raw materials in parts by weight: the material comprises the following raw materials in parts by weight: 80 parts of water-based epoxy resin, 28 parts of acrylic resin emulsion, 12 parts of polyurethane resin, 20 parts of deionized water, 8 parts of fatty acid triglyceride, 3 parts of organic modified zirconium phosphate, 2.5 parts of zinc stearate and 0.5 part of organic silicon defoamer.
3. The metal protective coating according to claim 1 or 2, wherein the preparation of the organically modified zirconium phosphate is: adding 5 parts of gamma-zirconium phosphate into 100 parts of deionized water, stirring and dispersing for 6-7 hours at the rotating speed of 800-1200 r/min, then stirring and heating to 35-40 ℃, adding 4 parts of low molecular weight polyetheramine, reacting for 10-12 hours, filtering, washing, and drying at the temperature of 55-65 ℃ to obtain the organic modified zirconium phosphate.
4. The metal protective coating according to claim 1 or 2, wherein the silicone defoamer is prepared by: mixing 12 parts of dimethyl silicone oil and 4 parts of linolenic acid, stirring and mixing uniformly at the rotation speed of 1000-1500 r/min, heating to 75-85 ℃, introducing nitrogen for protection, adding 0.7 part of nano silicon dioxide, stirring for 20-30 min, adding 5.5 parts of polyether silicone oil, stirring for 30-35 min at the rotation speed of 1500-2000 r/min, reducing the temperature to 40-45 ℃, stirring for 10-15 min at the rotation speed of 1000-1500 r/min, heating to 55-65 ℃, adding 0.3 part of ammonium glycyrrhizate within 5-10 min of stirring, reducing the temperature to 30-35 ℃, and stirring for 15-20 min at the rotation speed of 1000-1500 r/min to obtain the organic silicon defoaming agent.
5. The preparation method of the metal protective coating according to any one of claims 1 to 5, which comprises the following steps:
s1, respectively carrying out superfine grinding on the water-based epoxy resin, the polyurethane resin, the zinc stearate and the organic modified zirconium phosphate in a superfine grinder to respectively obtain water-based epoxy resin micropowder, polyurethane resin micropowder, zinc stearate micropowder and organic modified zirconium phosphate micropowder;
s2, adding aqueous epoxy resin micro powder into deionized water, stirring for 30-35 min at the rotating speed of 1500-2000 r/min, heating to 55-65 ℃, adding acrylic resin emulsion, and stirring for a period of time under microwave to obtain a coating base liquid;
s3, adding fatty acid triglyceride into the coating base liquid, stirring for 15-20 min at the rotating speed of 2000-2500 r/min, heating to 65-75 ℃, adding polyurethane resin, stirring for a period of time under microwave, adding organic modified zirconium phosphate and zinc stearate, and mixing uniformly to obtain a coating emulsion;
s4, adding the organic silicon defoaming agent into the coating emulsion, uniformly mixing, reducing the temperature to 35-40 ℃, and stirring for 50-55 min at the rotating speed of 3000-3500 r/min to obtain the metal protection coating.
6. The method for preparing a metal protective coating according to claim 5, wherein the microwave processing conditions in step S2 are as follows: stirring for 40-45 min under the condition of microwave power of 1000-1500W.
7. The method for preparing a metal protective coating according to claim 5, wherein the microwave processing conditions in step S3 are as follows: stirring for 30-35 min under the condition of microwave power of 700-1000W.
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