CN112143298A - Composition for use as a corrosion protection coating, method for the production thereof and component - Google Patents
Composition for use as a corrosion protection coating, method for the production thereof and component Download PDFInfo
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- 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
- C09D127/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers
- C09D127/02—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment
- C09D127/12—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
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- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
- C09D175/04—Polyurethanes
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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
- C09D5/10—Anti-corrosive paints containing metal dust
- C09D5/103—Anti-corrosive paints containing metal dust containing Al
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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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
- C09D5/10—Anti-corrosive paints containing metal dust
- C09D5/106—Anti-corrosive paints containing metal dust containing Zn
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- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
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- C08K2003/0812—Aluminium
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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- C08K3/00—Use of inorganic substances as compounding ingredients
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Abstract
The application relates to the technical field of substrate anticorrosion, and discloses a composition used as an anticorrosion coating, which comprises the following components in parts by mass: 0.1-3 parts of graphene, 0.1-3 parts of aluminum powder and/or zinc powder, 10-20 parts of inert diluent, 50-100 parts of resin, 1.5-10 parts of curing agent and 10-20 parts of active diluent. The composition used as the anticorrosive coating has high anticorrosive performance. Also disclosed are a method for preparing the composition for use as a corrosion protective coating and a member having a surface coated with the composition.
Description
Technical Field
The application relates to the technical field of substrate corrosion prevention, for example, relates to a composition used as a corrosion prevention coating, a preparation method thereof and a component.
Background
In general, a coating layer having an anti-corrosion function or the like is required to be applied to a surface of a member made of metal or the like to protect the member, and to extend the service life of the member, for example, a member such as a heat exchanger, a copper pipe, and a sheet metal member. The heat exchanger is used as a heat exchange device and widely applied to heat transfer and exchange equipment such as air conditioners, air source heat pumps, refrigeration equipment and the like. Because the heat exchanger works in humid, dusty, high-temperature and other environments, the problems of corrosion, scaling and the like can occur after the heat exchanger is used for a long time, the heat conduction performance of the heat exchanger is reduced, even the whole unit is paralyzed, the energy consumption is increased, even equipment needs to be replaced, and economic loss is caused. Therefore, the surface of the heat exchanger is often subjected to surface treatment such as corrosion prevention and water prevention. The surface of the existing heat exchanger is generally coated with a polyacrylic resin hydrophilic coating, and the polyacrylic resin hydrophilic coating mainly plays roles in corrosion prevention, water bridge prevention and the like.
In the process of implementing the embodiments of the present disclosure, it is found that at least the following problems exist in the related art: the existing coating has poor corrosion prevention effect.
Disclosure of Invention
The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview nor is intended to identify key/critical elements or to delineate the scope of such embodiments but rather as a prelude to the more detailed description that is presented later.
The embodiment of the disclosure provides a composition used as an anticorrosive coating, and a preparation method and a component thereof, so as to solve the technical problem of poor anticorrosive effect of the existing coating.
In some embodiments, the composition for use as an anti-corrosive coating comprises, in parts by mass: 0.1-3 parts of graphene, 0.1-3 parts of aluminum powder and/or zinc powder, 10-20 parts of inert diluent, 50-100 parts of resin, 1.5-10 parts of curing agent and 10-20 parts of active diluent.
In some embodiments, the method of preparing the corrosion protective coating comprises: adding aluminum powder and/or zinc powder and graphene into an inert diluent, performing ultrasonic dispersion to obtain a mixture, and mixing resin, a curing agent and an active diluent with the mixture to obtain the composition.
In some embodiments, the component surface is coated with the aforementioned composition.
The anticorrosive coating provided by the embodiment of the disclosure, and the preparation method and the application thereof can realize the following technical effects:
the anticorrosive coating provided by the embodiment of the disclosure comprises graphene and aluminum powder and/or zinc powder serving as a sacrificial anode, and the mass parts of the inert diluent, the resin, the curing agent and the active diluent are limited to obtain a first layer in the heavy anticorrosive coating hybridized by the aluminum and zinc alkene, wherein the first layer is in direct contact with the surface of a substrate, and has high anticorrosive performance, and the alkene in the aluminum alkene hybridization is graphene.
The foregoing general description and the following description are exemplary and explanatory only and are not restrictive of the application.
Detailed Description
So that the manner in which the features and technical content of the embodiments of the present disclosure can be understood in detail, a detailed description of the embodiments of the present disclosure will be provided below. In the following description of the technology, for purposes of explanation, numerous details are set forth in order to provide a thorough understanding of the disclosed embodiments. However, one or more embodiments may be practiced without these details.
The embodiment of the disclosure provides a first composition used as an anticorrosive coating, and the composition comprises the following components in parts by mass: 0.1-2 parts of graphene, 0.1-2 parts of aluminum powder and/or zinc powder, 10-20 parts of inert diluent, 3-10 parts of first resin, 1.5-10 parts of first curing agent, 0.5-3 parts of active diluent and 0.5-3 parts of auxiliary agent.
The composition used as the anti-corrosion coating provided by the embodiment of the disclosure comprises graphene, aluminum powder and/or zinc powder, an inert diluent, resin, a curing agent, a reactive diluent and an auxiliary agent. Among them, the "resin" in the first composition for the anticorrosive coating may also be referred to as "first resin", and the "curing agent" may also be referred to as "first curing agent".
Graphene, which is an important component in the first composition used as the anticorrosive coating, can effectively prevent substances with corrosivity and the like in the external environment from permeating and diffusing into the matrix, can form a compact protective layer, and has good anticorrosive performance, salt mist resistance and good heat conductivity. The amount of graphene in the first composition for an anticorrosive coating may be 0.1 to 2 parts by mass, and may be any one of 0.1, 0.3, 0.5, 0.7, 1, 1.2, 1.4, 1.6, and 2 parts by mass, and any one of the values in the range of the values of these points. The aluminum powder and/or the zinc powder are used as a sacrificial anode material in the first composition used as the anticorrosive coating and react with corrosive substances to consume the corrosive substances entering the first composition used as the anticorrosive coating to exert the corrosion resistance, and meanwhile, the aluminum powder and/or the zinc powder have different molecular structures with graphene, so that a compact structure can be formed, the permeation and diffusion paths of the corrosive substances to a substrate are blocked and prolonged, and the corrosion resistance of the first composition used as the anticorrosive coating is improved. The mass fraction of the aluminum powder and/or the zinc powder in the first composition for an anticorrosive coating may be 0.1 to 2 parts, and may be any one of values of 0.1, 0.2, 0.4, 0.6, 0.9, 1.1, 1.3, 1.5, 1.7, and 2 parts, and any one of values in the range of the point composition. Optionally, the first composition used as the anticorrosive coating is aluminum powder, and is combined with graphene to obtain an aluminum-graphene hybrid heavy-duty anticorrosive first composition used as the anticorrosive coating.
The inert diluent is present in the first composition for use as a corrosion protective coating in an amount of 10 to 20 parts by weight, and may be, for example, any one of 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20 parts by weight, or any one of a range of values consisting of these values. The inert diluent can improve the mixing uniformity of the graphene and the aluminum powder and/or the zinc powder, so that the first compact and uniformly mixed composition used as the anticorrosive coating is obtained. Optionally, the inert diluent may be one or a combination of more than one of alcohols, esters, ketones, and toluene compounds. The mass fraction of the first resin in the first composition for use as an anticorrosive coating is 3 to 10 parts, and may be, for example, any one of 3, 4, 5, 6, 7, 8, 9, 10 parts, and any one of the values in the range composed of these points. The first resin can improve the adhesion of the first composition used as the anticorrosive coating to the surface of the substrate and prevent the first composition used as the anticorrosive coating from bubbling out. The mass part of the first curing agent in the first composition for an anticorrosive coating is 1.5 to 10 parts, and may be any one of values of 1.5, 1.7, 2, 3, 4, 5, 6, 7, 8, 9, 10 parts, for example, and any one of values in the range composed of these points.
Optionally, the first curing agent may be one or a combination of more than one of aliphatic amines, isocyanates and polyamide compounds. The first curing agent can cure the first composition used as the anticorrosive coating on the premise of ensuring the mixing uniformity of the graphene and the aluminum powder and/or the zinc powder.
The amount of reactive diluent in the first composition for use as a corrosion protective coating is from 0.5 to 3 parts by weight, and may be, for example, any one of 0.5, 0.7, 0.8, 0.9, 1, 1.2, 1.5, 2, 2.4, 2.7, 2.9, 3 parts, and any one of a range of values consisting of these points. Optionally, the reactive diluent may be one or more of propylene oxide o-tolyl ether, o-tolyl glycidyl ether, and fatty glycidyl ether compounds.
The mass fraction of the auxiliary in the first composition for use as a corrosion protective coating is 0.5 to 3 parts, and may be, for example, any one of values of 0.5, 0.7, 0.9, 1, 1.3, 1.5, 1.9, 2, 2.2, 2.5, 2.9, 3 parts, and any one of values in the range of values consisting of these points. Optionally, the auxiliary agent may be one or a combination of more than one of an adhesion promoter, a leveling agent, a defoaming agent, a stabilizer and an antioxidant. The adhesion promoter can be one or the combination of more than one of silane coupling agent, titanate coupling agent, polyester glycol and polyester resin, and can improve the adhesion between the first composition used as the anticorrosive coating and the substrate. The leveling agent can be one or the combination of more than one of polyethylacrylate, polybutyl acrylate, organosilicon modified acrylate polymer and polysiloxane, can effectively reduce the surface tension of the first composition used as the anticorrosive coating, improve the coverage of the first composition used as the anticorrosive coating and ensure that the formed film is uniform and natural. The defoaming agent can be one or the combination of more than one of emulsified silicone oil, polydimethylsiloxane and polyoxyethylene polyoxypropylene amine ether, and can inhibit the generation of bubbles or eliminate the generated bubbles in the production and use processes of the first composition used as the anticorrosive coating. The stabilizer comprises one or more of calcium-zinc composite stabilizer, organic tin carboxylate, antimony mercaptide and epoxy butyl stearate, and can prevent oxidative decomposition and aging of the first composition used as the anticorrosive coating caused by light, heat and the like. The antioxidant comprises one or more of diphenylamine, p-phenylenediamine, antioxidant 1010 and antioxidant 1076, and can delay or inhibit the oxidation process of the first resin, thereby preventing the first composition used as the anticorrosive coating from aging and prolonging the service life of the first composition.
According to the composition used as the anticorrosive coating in the first anticorrosive coating provided by the embodiment of the disclosure, graphene and aluminum powder and/or zinc powder jointly play an anticorrosive role, so that the anticorrosive performance is good, meanwhile, the formed compact structure prolongs the path of corrosive substances to the surface of the substrate, the adhesion performance with the substrate is good, the bubbling and falling off of the composition used as the anticorrosive coating are effectively prevented, and the service life of the anticorrosive coating is prolonged.
In a first composition of the corrosion protective coating provided by the embodiments of the present disclosure, which is used as a corrosion protective coating, the first resin may be an epoxy resin.
The epoxy resin can be one or more of glycidyl ether epoxy resin, glycidyl ester epoxy resin and alicyclic epoxy resin. The epoxy resin can improve the adhesion property of the first composition used as the anticorrosive coating and a substrate, prevent the first composition used as the anticorrosive coating from bubbling and falling off, and improve the anticorrosive time of the coating.
In the composition for the first anticorrosion coating provided by the embodiment of the present disclosure, the coating thickness of the composition for the first anticorrosion coating may be 1 to 500 μm. The coating thickness is set to ensure the corrosion resistance of the first composition used as the corrosion-resistant coating without affecting the performance of the substrate.
Alternatively, the first composition for use as an anticorrosive coating may be applied at a thickness of any one of 1, 10, 50, 100, 150, 200, 250, 300, 400, 500 μm, and any one of values in a range composed of these points. The first composition used as a corrosion protective coating should not be applied at a thickness too high to affect the properties of the substrate, and the first composition used as a corrosion protective coating should not be applied at a thickness too low to affect the corrosion protection properties of the coating. Optionally, the coating thickness of the first composition used as the anticorrosion coating can be different at different parts of the substrate, and the coating thickness can be set according to the actual anticorrosion requirement and the substrate performance. For example, the first composition for an anticorrosive coating may be applied at a thickness of 100-250 μm or 250-500 μm at a portion where the substrate is in contact with more corrosive substances, and may be applied at a thickness of 1-100 μm at a portion where the substrate is in contact with less corrosive substances. Alternatively, the first composition for use as an anticorrosive coating may be applied in a thickness of 1 to 250 μm.
The first composition used as the anticorrosion coating provided by the embodiment of the disclosure can be used as a bottom anticorrosion coating composition and is configured to be coated on the surface of a substrate, and the bottom anticorrosion coating is obtained after coating.
The first composition used as the anticorrosive coating provided by the embodiment of the disclosure is used as a bottom anticorrosive coating composition, has a good anticorrosive effect, has good adhesion performance with a substrate, ensures the adhesion performance with the substrate, and prevents the anticorrosive coating from falling off.
In some embodiments, the composition for use as an anti-corrosive coating further comprises a tie-layer anti-corrosive coating composition. And coating the bonding layer anticorrosive coating composition on the surface of the substrate or the surface of the bottom layer anticorrosive coating to obtain the bonding layer anticorrosive coating.
The bonding layer anticorrosive coating composition can be a composition with a bonding effect with a bottom layer anticorrosive coating, in the actual coating process, the bottom layer anticorrosive coating composition is directly coated on the surface of a base body and directly contacts with the base body to obtain the bottom layer anticorrosive coating, and the bonding layer anticorrosive coating composition is coated on the surface of the bottom layer anticorrosive coating and has a good bonding effect with the bottom layer anticorrosive coating. Alternatively, the adhesive layer composition herein may be a composition having an antiseptic effect.
Optionally, the components of the paste layer anticorrosive coating composition herein may include: one or more of antiseptic component, metal, solvent, resin, curing agent, other assistant, etc.
The disclosed embodiments also provide a second composition for use as a corrosion protective coating. The second composition used as the anti-corrosion coating comprises the following components in parts by mass: 0.1-3 parts of graphene, 0.1-3 parts of aluminum powder and/or zinc powder, 10-20 parts of inert diluent, 50-100 parts of resin, 1.5-10 parts of curing agent and 10-20 parts of active diluent. The "resin" in the second composition for use as an anticorrosive coating may be referred to as "second resin" and the "curing agent" may be referred to as "second curing agent".
Alternatively, the second composition herein used as a corrosion protective coating may be used alone or in combination with other coatings. Alternatively, the second composition herein used as a corrosion protective coating may be used as the aforementioned tie-layer corrosion protective coating, together with the aforementioned first composition used as a corrosion protective coating. Alternatively, when the first composition for an anticorrosive coating is used together with the second composition for an anticorrosive coating, the first composition for an anticorrosive coating is applied directly to the surface of a substrate as a primer anticorrosive composition, and the second composition for an anticorrosive coating is applied to the primer anticorrosive coating as a tie-layer anticorrosive composition coating.
The composition used as the anticorrosive coating in the second anticorrosive coating provided by the embodiment of the disclosure has an anticorrosive effect, and meanwhile, the composition used as the anticorrosive coating has a hydrophobic property, so that water and other corrosive substances are prevented from entering the anticorrosive coating, and the anticorrosive effect is improved.
The second composition used as the anticorrosive coating comprises graphene, aluminum powder and/or zinc powder, an inert diluent, a second resin, a second curing agent and a reactive diluent. The graphene is used as an important component in the second composition used as the anticorrosive coating, can effectively prevent substances with corrosivity and the like in the external environment from permeating and diffusing into the matrix, can form a compact protective layer, and has good anticorrosive performance, salt mist resistance and good heat conductivity. The amount of graphene in the second composition for an anticorrosive coating may be 0.1 to 3 parts by mass, and may be any one of 0.1, 0.4, 0.8, 1, 1.3, 1.6, 1.9, 2, 2.2, 2.5, 2.7, and 3 parts by mass, and any one of the values in the range of these values. The aluminum powder and/or the zinc powder are used as a sacrificial anode material in the second composition used as the anticorrosive coating and react with corrosive substances to consume the corrosive substances entering the second composition used as the anticorrosive coating to exert the corrosion resistance, and meanwhile, the aluminum powder and/or the zinc powder have different molecular structures with the graphene, so that a compact structure can be formed, the permeation and diffusion paths of the corrosive substances to a substrate are blocked and prolonged, and the corrosion resistance of the second composition used as the anticorrosive coating is improved. The mass fraction of the aluminum powder and/or the zinc powder in the second composition for an anticorrosive coating may be 0.1 to 3 parts, and may be any one of values of 0.1, 0.5, 0.8, 1.1, 1.4, 1.6, 1.9, 2, 2.4, 2.5, 2.7, and 3 parts, and any one of values in the range of the values of these points. Optionally, the second composition used as the anticorrosive coating is aluminum powder, and is combined with graphene to obtain an aluminum-graphene hybrid heavy-duty anticorrosive second composition used as the anticorrosive coating.
The inert diluent is present in the second composition for use as a corrosion protective coating in an amount of 10 to 20 parts by weight, and may be, for example, any one of 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20 parts by weight, or any one of a range of values consisting of these values. The inert diluent can improve the mixing uniformity of the graphene and the aluminum powder and/or the zinc powder, and further obtain a second composition which is compact and uniformly mixed and is used as an anticorrosive coating. Optionally, the inert diluent may be one or a combination of more than one of alcohols, esters, ketones, and toluene compounds. The mass part of the second resin in the second composition for an anticorrosive coating is 50 to 100 parts, and may be, for example, any one of 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, 100 parts, and any one of values in a range composed of these points.
The second resin may improve adhesion of the second composition for an anticorrosion coating to the surface of the underlying anticorrosion coating while imparting hydrophobic properties to the second composition for an anticorrosion coating. The mass part of the second curing agent in the second composition for an anticorrosive coating is 1.5 to 10 parts, and may be any one of values of 1.5, 1.7, 2, 3, 4, 5, 6, 7, 8, 9, 10 parts, for example, and any one of values in the range composed of these points. The second curing agent can cure the second composition used as the anticorrosive coating on the premise of ensuring the mixing uniformity of the graphene and the aluminum powder and/or the zinc powder.
Alternatively, the second curing agent may be an isocyanate-based compound. The curing effect of the second composition used as a corrosion protective coating is improved.
The amount of reactive diluent in the second composition for use as a corrosion inhibiting coating is from 10 to 20 parts by weight, and may be, for example, any one of 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20 parts, and any one of a range of values consisting of these values. Optionally, the reactive diluent may be one or more of propylene oxide o-tolyl ether, o-tolyl glycidyl ether, and fatty glycidyl ether compounds.
The second resin in the composition used as the anticorrosive coating provided by the embodiment of the disclosure comprises one or more of fluorocarbon resin and polyurethane resin. The corrosion preventing property of the second composition used as the corrosion preventing coating is improved, the adhesion tightness of the second composition used as the corrosion preventing coating to the first composition used as the corrosion preventing coating is improved, and the hydrophobic property of the second composition used as the corrosion preventing coating is improved.
The second composition used as an anticorrosive coating provided in the examples of the present disclosure is applied to a thickness of 1 to 500 μm. The coating thickness is set so as to simultaneously secure the corrosion preventing property and the hydrophobic property of the second composition used as the corrosion preventing coating layer.
Alternatively, the second composition for use as an anticorrosive coating may be applied in a thickness of any one of 1, 10, 50, 100, 150, 200, 250, 300, 400, 500 μm, and any one of values in a range composed of these points. The coating thickness of the second composition used as the anticorrosive coating is not too high, otherwise the performance of the substrate is influenced, and the adhesion effect with the bottom anticorrosive coating is reduced; the second composition used as a corrosion protective coating should not be applied at too low a thickness to affect the corrosion protection properties of the coating. Optionally, the coating thickness of the second composition used as the anticorrosion coating can be different at different parts of the substrate, and the coating thickness can be set according to the actual anticorrosion requirement and the coating thickness of the bottom anticorrosion coating. For example, the second composition for an anticorrosive coating may be applied at a thickness of 100-250 μm or 250-500 μm at a portion where the substrate is in contact with more corrosive substances, and may be applied at a thickness of 1-100 μm at a portion where the substrate is in contact with less corrosive substances. Alternatively, the second composition for use as an anticorrosive coating may be applied in a thickness of 1 to 250. mu.m.
Optionally, the second resin is a fluorocarbon resin. When the second resin is a fluorocarbon resin, the second composition used as an anticorrosive coating may also be referred to as a graphene fluorocarbon coating. The graphene fluorocarbon coating comprises the following components in parts by mass: 0.1-3 parts of graphene, 0.1-3 parts of aluminum powder and/or zinc powder, 10-20 parts of inert diluent, 50-100 parts of fluorocarbon resin, 1.5-10 parts of second curing agent and 10-20 parts of reactive diluent. The embodiments of the graphene, the aluminum powder and/or the zinc powder, the inert diluent, the fluorocarbon resin, the second curing agent, the reactive diluent, the coating thickness and the like are the same as those of the second composition used as the anticorrosive coating, and are not described herein again.
Optionally, the second resin is a polyurethane resin. When the second resin is a polyurethane resin, the second composition used as the anticorrosive coating may also be referred to as a graphene polyurethane coating. The graphene polyurethane coating comprises the following components in parts by mass: 0.1-3 parts of graphene, 0.1-3 parts of aluminum powder and/or zinc powder, 10-20 parts of inert diluent, 50-100 parts of polyurethane resin, 1.5-10 parts of second curing agent and 10-20 parts of active diluent. The examples of the graphene, the aluminum powder and/or the zinc powder, the inert diluent, the polyurethane resin, the second curing agent, the reactive diluent, the coating thickness, and the like are the same as those of the second composition used as the anticorrosive coating, and are not described herein again.
In some embodiments, the composition used as an anti-corrosion coating further comprises a top anti-corrosion coating composition. And coating the surface anticorrosive coating composition to obtain the surface anticorrosive coating. The surface layer anticorrosive coating composition can be used as a finishing coat and plays a role in water resistance. In the actual coating process, the bottom layer anticorrosive coating composition is directly coated on the surface of the base body and is in direct contact with the base body to obtain the bottom layer anticorrosive coating, the bonding layer anticorrosive coating composition is coated on the surface of the bottom layer anticorrosive coating to obtain the adhesive layer anticorrosive coating, the adhesive layer anticorrosive coating and the bottom layer anticorrosive coating have a good adhesive effect, and the surface layer anticorrosive coating composition is coated on the surface of the adhesive layer anticorrosive coating to play a waterproof effect. Thereby obtaining the heavy anti-corrosion coating with the combined action of the three anti-corrosion coatings.
Optionally, the surface anticorrosive coating composition herein is a composition having a water-repellent effect. Optionally, the components of the top anti-corrosive coating composition may include: one or more of silica sol, water, hydrophobic treatment agent, solvent, etc.
The disclosed embodiments also provide a third composition for use as a corrosion protective coating. The third composition used as the anticorrosive coating comprises the following components in parts by mass: 1-15 parts of nano silica sol, 2-10 parts of 35 wt% ammonia water, 6-16 parts of water, 0.1-1 part of tetraethyl orthosilicate, 0.1-2 parts of hydrophobic treatment agent and 60-100 parts of absolute ethyl alcohol.
Alternatively, the third composition herein used as a corrosion protective coating may be used alone or in combination with other coatings. When the third composition for an anticorrosive coating is used together with other coating layers, the third composition for an anticorrosive coating may be applied outermost as a top anticorrosive coating. Before coating the surface anticorrosive coating, a bottom anticorrosive coating composition which is directly contacted with a substrate can be coated to obtain a two-layer composite coating; and a bonding layer anticorrosive coating composition can be coated between the bottom layer anticorrosive coating and the surface layer anticorrosive coating to obtain a three-layer composite coating.
Alternatively, the third composition for use as an anti-corrosive coating provided by the embodiments of the present disclosure may be a top anti-corrosive coating composition.
The third composition used as the anticorrosive coating has super-hydrophobic property, special surface wettability and extremely low surface adhesiveness, prevents liquid drops, dust and the like from being adsorbed and accumulated on the surface of the anticorrosive coating, is easy to desorb, avoids the penetration of water drops, the breeding of bacteria and the generation of water films and water bridges, and improves the corrosion resistance of the anticorrosive coating. The super-hydrophobic property is shown as follows: the third composition used as the anticorrosive coating has a static contact angle of more than 160 degrees and a rolling angle of less than 1 degree to water, shows weak adhesion, is easy to generate self-propelled bounce on condensed water drops on the surface of a substrate, and is difficult to nucleate and grow on the surface of the third composition used as the anticorrosive coating, thereby effectively preventing the liquid drops from permeating and diffusing to the substrate.
Alternatively, the part by mass of the nano silica sol in the third composition for an anticorrosive coating may be 1 to 15 parts, for example, any one of 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 parts, and any one of the values in the range composed of these points. The mass part of 35% wt ammonia water in the third composition for an anticorrosive coating may be 2 to 10 parts, and may be any one of values of 2, 3, 4, 5, 6, 7, 8, 9, 10 parts, and any one of values in a range composed of these values, for example. Wherein wt represents a weight fraction. Alternatively, the mass fraction of water in the third composition for use as an anticorrosive coating may be 6 to 16 parts, and for example, may be any one of 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 parts, and any one of the values in the range composed of these points. The amount of tetraethyl orthosilicate in the third composition used as an anticorrosive coating is 0.1 to 1 part by mass, and may be, for example, any one of 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0 part, and any one of the values in the range of the point values. Optionally, the hydrophobic treatment agent is present in the third composition for use as an anticorrosive coating in an amount of 0.1 to 2 parts by mass, for example, any of 0.1, 0.3, 0.5, 0.7, 0.9, 1.1, 1.3, 1.5, 1.7, 2 parts, and any of the values in the range of values consisting of these points. The mass part of the absolute ethyl alcohol in the third composition used as the anticorrosive coating is 60 to 100 parts, and may be any one of 60, 65, 70, 75, 80, 85, 90, 95, 100 parts, for example, and any one of the values in the range composed of these values.
Optionally, the hydrophobic treatment agent is one or a combination of more than one of fluorine-containing acrylic resin and alkyl siloxane, so that the super-hydrophobic property of the third composition used as the anticorrosive coating is improved.
The first composition used as the anticorrosive coating, the second composition used as the anticorrosive coating and the third composition used as the anticorrosive coating provided by the embodiment of the disclosure can be used independently, can be combined in any two pairs to obtain two-layer composite coatings, and can also be used together with other coating compositions to obtain two-layer, three-layer or more than three-layer composite coatings.
Alternatively, the anticorrosive coating provided by the embodiments of the present disclosure may include a first composition used as an anticorrosive coating, a second composition used as an anticorrosive coating, and a third composition used as an anticorrosive coating. When the anticorrosive coating has the three anticorrosive coatings, the three anticorrosive coatings act together to exert the heavy anticorrosive performance. Firstly, the third composition used as the anticorrosive coating exerts the super-hydrophobic property thereof and is used as a first defense line, so that the quantity of corrosive substances such as water drops, dust and the like entering the anticorrosive coating is greatly reduced; secondly, the second composition used as the anticorrosive coating is used as a second defense line and has anticorrosive performance, graphene and aluminum powder and/or zinc powder form hybridization, the path of corrosive substances entering a substrate is prolonged, meanwhile, the aluminum powder and/or the zinc powder can be used as a sacrificial anode to react with the corrosive substances, the second composition used as the anticorrosive coating can be used as an intermediate layer, and the second composition and the first composition and the third composition used as the anticorrosive coatings have good adhesive performance, so that the integrity of the whole anticorrosive coating is improved, and the anticorrosive coating is prevented from being layered; and finally, the third composition used as the anticorrosive coating is used as a last line of defense, the compact hybridization formed by the graphene and the aluminum powder and/or the zinc powder prolongs the path of corrosive substances entering the substrate, meanwhile, the aluminum powder and/or the zinc powder can be used as a sacrificial anode to react with the corrosive substances, and the third composition used as the anticorrosive coating has good adhesion performance with the substrate, so that the whole coating is prevented from falling off.
Embodiments of the present disclosure also provide a method of preparing a first composition for use as a corrosion protective coating, comprising: adding aluminum powder and/or zinc powder and graphene into an inert diluent, performing ultrasonic dispersion to obtain a mixture, and mixing resin, a curing agent, an active diluent and an auxiliary agent with the mixture to obtain the first composition used as the anticorrosive coating. The "resin" herein may also be referred to as "first resin", the "curing agent" may also be referred to as "first curing agent", and the "mixture" may also be referred to as "first mixture".
The first composition used as the anticorrosive coating prepared by the method provided by the embodiment of the disclosure is uniformly mixed, so that the performance of the first composition used as the anticorrosive coating is improved.
Optionally, the ultrasonic dispersion time is 0.5-1h, so that the uniformity of the mixture is improved. Optionally, the first resin, the first curing agent, the reactive diluent, the auxiliary agent and the first mixture are mixed by adopting a mechanical stirring manner, and the mechanical stirring time is 15-30 min.
The disclosed embodiments also provide a method for preparing a second composition for use as an anti-corrosive coating: adding aluminum powder and/or zinc powder and graphene into an inert diluent, performing ultrasonic dispersion to obtain a mixture, and mixing resin, a curing agent and a reactive diluent with the mixture to obtain the second composition used as the anticorrosive coating. The "resin" herein may also be referred to as "second resin", the "curing agent" may also be referred to as "second curing agent", and the "mixture" may also be referred to as "second mixture".
The second composition used as the anticorrosive coating prepared by the method provided by the embodiment of the disclosure is uniformly mixed, so that the performance of the second composition used as the anticorrosive coating and the adhesion performance of the second composition to other coatings are improved.
Optionally, the second resin is one or more of fluorocarbon resin and polyurethane resin. Optionally, the ultrasonic dispersion time is 0.5-1 h. Optionally, the second resin, the second curing agent and the second mixture of the reactive diluent are mixed by adopting a mechanical stirring manner, and the mechanical stirring time is 15-30 min.
Embodiments of the present disclosure also provide a method for preparing a third composition for use as an anticorrosion coating, further comprising: mixing the nano silica sol, 35 wt% ammonia water, tetraethyl orthosilicate, a hydrophobic treatment agent and absolute ethyl alcohol, and mechanically stirring to obtain the third composition used as the anticorrosive coating. Optionally, the time for mechanical stirring in this example is 12-48 h. The third composition used as the anticorrosive coating prepared by the method provided by the embodiment of the disclosure has the advantages that the components are uniformly mixed, and the performance of the third composition used as the anticorrosive coating and the adhesion performance of the third composition with other coatings are improved.
The coating method of the anticorrosion coating on the surface of the substrate provided by the embodiment of the disclosure comprises the following steps:
s101, cleaning and drying the surface of a substrate, coating the first composition used as an anticorrosive coating on the surface of the substrate, and standing at normal temperature for 5-10min after coating to solidify or semi-solidify the surface of the first composition used as the anticorrosive coating;
and/or the presence of a gas in the gas,
s102, coating a second composition used as an anticorrosive coating, and standing at normal temperature for 5-10min after the coating is finished so as to cure or semi-cure the surface of the second composition used as the anticorrosive coating;
and/or the presence of a gas in the gas,
and S103, coating a third composition used as an anticorrosive coating, and after the coating is finished, drying and curing the composition in an oven at the temperature of 60-80 ℃ for 4-6h to obtain the coating.
The coating method of the anticorrosive coating provided by the embodiment of the disclosure is simple, is easy to operate, is suitable for large-scale production, and has small damage to the substrate and huge application prospect.
Substrates coated with any of the foregoing corrosion protective coatings can be subjected to a neutral salt spray test for 1500 hours. After 1500h of neutral salt spray test, the coating film on the surface of the substrate coated with the heavy anti-corrosion coating is basically unchanged, the phenomena of bubbling, cracking, falling off, rust spots and rusting do not occur, and the substrate shows better salt spray resistance; and the untreated substrate surface has more rusty spots and pits.
The embodiment of the present disclosure also provides a component coated with any one of the foregoing coatings, and the material of the component may be a simple metal or an alloy, such as a heat exchanger, a copper pipe, a sheet metal part, and the like. The member herein may be the aforementioned substrate.
The anti-corrosion coating provided by the embodiment of the disclosure is applied to the surfaces of heat exchangers, copper pipes, sheet metal parts and the like, so that the anti-corrosion performance of components is greatly improved.
The embodiment of the disclosure provides an anticorrosion coating containing the first composition used as the anticorrosion coating, and a preparation method and application thereof.
Sequentially adding 0.5 part by mass of aluminum powder and 0.5 part by mass of graphene into 20 parts by mass of acetone, and placing the mixture in an ultrasonic cleaner for ultrasonic dispersion for 1 hour to obtain a first mixture; the first mixture was added to a solution containing 8 parts by mass of glycidyl ether epoxy resin, 4 parts by mass of toluene diisocyanate, 2 parts by mass of propylene oxide o-tolyl ether and 1 part by mass of an auxiliary, and continuously mechanically stirred for 20min to obtain a mixed solution of the first composition for an anticorrosive coating.
The mixed liquid of the first composition used as the anticorrosive coating obtained in the embodiment of the disclosure is coated on the surface of the heat exchanger, so that the anticorrosive effect of the heat exchanger is improved.
The first composition for an anticorrosive coating obtained by replacing the aluminum powder in this example with zinc powder and selecting the inert diluent, the first resin, the first curing agent, the reactive diluent and the auxiliary agent of the other types and parts by mass as described above has the same or similar effects as in this example.
The embodiment of the disclosure provides an anticorrosion coating comprising the first composition used as the anticorrosion coating and the second composition used as the anticorrosion coating, and a preparation method and application thereof.
Sequentially adding 0.1 part by mass of aluminum powder and 0.1 part by mass of graphene into 10 parts by mass of ethanol, and placing the mixture in an ultrasonic cleaner for ultrasonic dispersion for 0.5h to obtain a first mixture; the ultrasonically dispersed first mixture was added to a solution containing 3 parts by mass of an epoxy resin, 1.5 parts by mass of toluene diisocyanate, 0.5 part by mass of an o-tolyl glycidyl ether solution, and 0.5 part by mass of an auxiliary, and continuously mechanically stirred for 15min to obtain a mixed solution of the first composition for an anticorrosive coating.
Sequentially adding 0.1 part by mass of aluminum powder and 0.1 part by mass of graphene into 10 parts by mass of ethanol, and placing the mixture in an ultrasonic cleaner for ultrasonic dispersion for 0.5h to obtain a second mixture; the ultrasonically dispersed second mixture was added to a mixture containing 50 parts by mass of fluorocarbon resin, 1.5 parts by mass of toluene diisocyanate, and 10 parts by mass of o-tolyl glycidyl ether, and continuously mechanically stirred for 15min to obtain a mixed solution of a second composition for an anticorrosive coating.
The mixed liquid of the first composition used as the anticorrosive coating and the mixed liquid of the second composition used as the anticorrosive coating, which are obtained by the embodiment of the disclosure, are sequentially coated on the surface of the heat exchanger, so that the anticorrosive effect of the heat exchanger is improved, and meanwhile, the first composition used as the anticorrosive coating and the second composition used as the anticorrosive coating have good adhesion performance, so that the obtained anticorrosive coating is not easy to delaminate.
The first composition for an anticorrosive coating and the second composition for an anticorrosive coating, which are obtained by replacing the aluminum powder in this example with zinc powder and selecting the inert diluent, the first resin, the second resin, the first curing agent, the second curing agent, the reactive diluent and/or the auxiliary agent in other types and parts by mass as described above, have the same or similar effects as in this example.
The embodiment of the disclosure provides an anticorrosion coating comprising the first composition used as an anticorrosion coating, the second composition used as an anticorrosion coating and the third composition used as an anticorrosion coating, and a preparation method and application thereof.
Sequentially adding 0.2 part by mass of aluminum powder and 2 parts by mass of graphene into 15 parts by mass of ethanol, and placing the mixture in an ultrasonic cleaner for ultrasonic dispersion for 1 hour to obtain a first mixture; the ultrasonically dispersed first mixture was added to a solution containing 10 parts by mass of an epoxy resin, 10 parts by mass of toluene diisocyanate, 3 parts by mass of an o-tolyl glycidyl ether solution, and 3 parts by mass of an auxiliary, and continuously mechanically stirred for 30min to obtain a mixed solution of a first composition for an anticorrosive coating.
Sequentially adding 3 parts by mass of aluminum powder and 3 parts by mass of graphene into 20 parts by mass of ethanol, and placing the mixture in an ultrasonic cleaner for ultrasonic dispersion for 1 hour to obtain a second mixture; and adding the ultrasonically dispersed second mixture into a mixture containing 100 parts by mass of fluorocarbon resin, 10 parts by mass of toluene diisocyanate and 20 parts by mass of o-tolyl glycidyl ether, and continuously mechanically stirring for 30min to obtain a mixed solution of a second composition used as an anticorrosive coating.
Dispersing 15 parts by mass of nano silica sol, 10 parts by mass of 35 wt% ammonia water, 16 parts by mass of deionized water, 1 part by mass of tetraethyl orthosilicate and 2 parts by mass of methyltrialkoxysilane in 100 parts by mass of absolute ethanol, and continuously mechanically stirring for 48 hours to obtain a mixed solution of a third composition used as an anticorrosive coating.
The mixed solution of the first composition used as the anti-corrosion coating, the mixed solution of the second composition used as the anti-corrosion coating and the mixed solution of the third composition used as the anti-corrosion coating obtained in the embodiment of the disclosure are sequentially coated on the surface of the heat exchanger to prevent the heat exchanger from being corroded.
The heat exchanger coated with the heavy anti-corrosion coating of the embodiment of the present disclosure has the following effects:
1. can withstand 1500h of neutral salt spray test. The expression is as follows: after 1500h of neutral salt spray test, the coating on the surface of the heat exchanger fin coated with the heavy anti-corrosion coating of the embodiment is basically unchanged, and the phenomena of bubbling, cracking, falling, rust spots and corrosion do not occur, so that the heat exchanger fin has better salt spray resistance.
2. Has the anti-dew and anti-frosting performance. The expression is as follows: the dew drops are difficult to nucleate and grow on the surface of the third composition used as the anticorrosive coating, so that the dew condensation time is delayed; due to the low adhesiveness of the surface of the third composition used as an anticorrosive coating, condensed liquid drops are easy to fall off by self-driven bounce, so that a water film and a water bridge are difficult to form on the surface; the desorption of condensed liquid drops reduces frosting nucleation sites, the frosting behavior of the surface is delayed, and meanwhile, the low adhesiveness of the surface enables the frost layer to be easily desorbed in the whole layer.
3. Has good heavy-duty corrosion resistance. The third is that a large amount of air trapped by the micro-nano composite structure of the composition used as the anticorrosive coating can greatly reduce the contact area between the corrosive substance and the surface and hinder the permeation and diffusion of the corrosive substance; the graphene added in the second composition used as the anticorrosive coating and the first composition used as the anticorrosive coating can form a compact lamellar structure, and effectively obstruct and prolong the permeation and diffusion path of corrosive substances and the like to a substrate; the aluminum powder and/or zinc powder added to the second composition used as the anticorrosive coating and the first composition used as the anticorrosive coating can react with corrosive media to consume corrosive substances as sacrificial anode materials. Under the combined action of the triple mechanisms, the heavy-duty coating provided by the embodiment of the disclosure has larger heavy-duty performance.
The first composition used as an anticorrosive coating, the second composition used as an anticorrosive coating, and the third composition used as an anticorrosive coating, which are obtained by replacing the aluminum powder in the present example with zinc powder and selecting the inert diluent, the first resin, the second resin, the first curing agent, the second curing agent, the reactive diluent, the auxiliary agent, and the hydrophobic treatment agent in other types and parts by mass as described above, all have the same or similar effects as those in the present example.
The ranges of the mass fraction of each component described in the present application include not only two end values of each range, but also all values between the two end values and a range value consisting of any two values between the two end values. For example, a first composition for use as an anti-corrosive coating comprises 0.1 to 2 parts by weight of graphene, where 0.1 to 2 includes not only the two endpoints 0.1, 2, but also all values between 0.1 and 2, and any two values between 0.1 and 2 (e.g., 1, 1.5) make up a range of values (e.g., 1 to 1.5).
Claims (10)
1. A composition for use as an anti-corrosive coating, characterized in that the composition comprises, in parts by mass:
2. the composition of claim 1, wherein the resin comprises one or more of:
fluorocarbon resin, polyurethane resin.
3. The composition of claim 1,
the curing agent comprises an isocyanate compound.
4. A method of preparing a composition for use as a corrosion protective coating, comprising:
adding aluminum powder and/or zinc powder and graphene into an inert diluent, performing ultrasonic dispersion to obtain a mixture,
mixing a resin, a curing agent, a reactive diluent with the mixture to obtain the composition of any one of claims 1-3.
5. The method of claim 4, wherein:
the time of ultrasonic dispersion is 0.5-1 h.
6. A component, wherein a surface of the component is coated with the composition of any one of claims 1 to 3.
7. A member as claimed in claim 6, characterized in that the composition is provided as a tie-coat corrosion protection coating.
8. The component of claim 7, further comprising: a primer corrosion protective coating configured to be applied to a surface of the component,
the bonding layer anticorrosive coating is coated on the surface of the bottom layer anticorrosive coating.
9. The component of claim 8, further comprising: a surface anti-corrosive coating disposed to coat the surface of the tie coat anti-corrosive coating.
10. Component according to any one of claims 6 to 9,
the component comprises a heat exchanger, a copper pipe or a sheet metal part.
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