CN112920689A - Heavy-duty anticorrosive paint with self-healing function and preparation and use methods thereof - Google Patents
Heavy-duty anticorrosive paint with self-healing function and preparation and use methods thereof Download PDFInfo
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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
- C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
- C09D163/10—Epoxy resins modified by unsaturated compounds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
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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
- 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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- 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
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
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Abstract
The invention discloses a heavy-duty anticorrosive paint with a self-healing function and a preparation and use method thereof. According to the invention, an epoxy resin-amino curing agent is taken as a base material, firstly, a diene furan-maleimide group is introduced on the epoxy resin or the amino curing agent, then the epoxy resin is dissolved by a diluent, graphene and carbon nano tubes are added, the mixture is stirred and mixed uniformly, then an auxiliary agent is added, and the mixture is stirred for a while to obtain a component A; and finally, mixing the A, B components in proportion, coating the mixture on the surface of a metal matrix, and curing to obtain the self-repairing coating. The coating disclosed by the invention is simple in preparation process and excellent in anti-corrosion performance, can realize self-repairing of a defect part for many times under the illumination condition, recovers the shielding capability on a corrosive medium, and can be widely applied to the heavy-duty anti-corrosion field of marine facilities, ship equipment, nuclear power industry and the like.
Description
Technical Field
The invention belongs to the technical field of coatings, and relates to a heavy-duty anticorrosive coating with a self-healing function, and a preparation method and a use method thereof.
Background
Metal corrosion is a phenomenon in which a metal material is damaged by the action of the surrounding environment medium. According to statistics, the corrosion cost of China in 2014 is 2.1 trillion yuan, which accounts for 3.34% of GDP in the same year. The marine corrosive environment is the most severe corrosive environment in nature. The marine corrosion loss in China is about 1/3 of the total corrosion loss, and can reach 7000 million yuan. Therefore, how to effectively inhibit corrosion of metal materials is a subject of great attention in the industrial field. Among the many methods of controlling metal corrosion, the use of epoxy coatings to isolate the metal material from the corrosive medium for corrosion protection is the most cost effective means. The carbon nano material is widely applied to the anti-corrosion coating to enhance the anti-corrosion performance of the coating due to good structural characteristics, and has very great application prospect in the heavy-duty anti-corrosion fields of marine facilities, marine equipment, nuclear power industry and the like.
But after the coating is used for a long time, microcracks with different scales are generated due to weathering and abrasion, the microcracks can expand and spread to become macroscopic defects, local corrosion of a metal matrix is caused, finally, the coating fails, great potential safety hazards are generated, and the coating cannot be repaired. However, a high-strength coating which can resist all external damage cannot be prepared at present, the application potential of the coating is greatly reduced by artificial detection and replacement, the use cost is increased, and the complexity of the process is increased. Thus, if the coating can be automatically detected and repaired at the initial stage of crack formation, the microcracks, potential hazards are prevented, which greatly increases the applicability of the coating. Therefore, the self-repairing coating becomes the key for solving the technical problems that the traditional anticorrosive coating loses the protective performance after being damaged by external force or environment and is difficult to form new protective capability in time.
The repair mechanism of the self-repairing coating is mainly divided into two main categories, namely an external aid type and an intrinsic type. The externally-applied self-repairing is to coat externally-applied self-repairing agents such as microcapsules, microfiber tubes and the like in a coating material, and when the coating is damaged, the repairing agents are released to repair the coating. The intrinsic self-repairing coating realizes self-repairing by means of self-reversible chemical reaction in film-forming molecules, can be repaired for many times without considering the compatibility of a matrix material and an external repairing substance, and does not need to worry about the problems of depletion of a repairing agent at the position and the like. The self-repairing mode is usually realized by recombining broken molecular chains after film forming, or self-repairing microcapsules are uniformly distributed in a coating material, and when the coating is damaged, the microcapsules release a repairing agent to repair the coating.
In recent years, the Diels-Alder (D-A) reaction has been widely used in the study of self-healing materials due to its good thermal reversibility. However, the self-repairing function of the material is realized at a higher temperature by a heating mode, and when the material is used in an actual natural environment, the material is limited by the volume, the function and the like of a component, so that the condition of heating the whole damaged component to the required temperature is obviously unrealistic, and the application of the self-repairing material is greatly limited. Therefore, the research on the self-repairing material which is easy to realize the self-repairing condition and can carry out accurate repair on the given damaged area has great application value. The research on the aspect is less at home and abroad.
Disclosure of Invention
The invention aims to provide a coating which can realize accurate in-situ self-repairing of a damaged area of the coating under an actual natural use environment through a photo-thermal effect or an electrothermal effect, has excellent corrosion protection performance after repairing, and solves the problem that the traditional method needs to be heated from the outside.
A heavy-duty anticorrosive paint with self-healing function is prepared by using epoxy resin-amino curing agent as coating base body, and firstly introducing diene furan-maleimide group (Diels-Alder bond) to epoxy resin or amino curing agent to obtain modified epoxy resin or amino curing agent. Then dissolving the epoxy resin with an organic solvent, then adding the carbon nano materials such as graphene, carbon nano tubes and the like, and stirring and mixing uniformly at a high speed to obtain a component A; and dissolving the amino curing agent by using an organic solvent to obtain a component B. And finally, mixing the A, B components in proportion, and coating the mixed solution on the surface of the metal matrix for curing to obtain the self-repairing coating.
In order to achieve the purpose, the invention can adopt the following two technical schemes:
the first scheme is as follows: firstly, preparing epoxy resin containing Diels-Alder bonds, and specifically comprising the following steps: dissolving 8 g of tetrabutylammonium hydrogen sulfate in a round-bottom flask containing 180 mL of epoxy chloropropane, introducing nitrogen at room temperature, then slowly dropwise adding 160 mL of furfuryl alcohol into the system through a constant-pressure funnel while stirring, and continuously reacting for 4 hours at room temperature after complete dropwise addition. Then, 320 mL of a 50% NaOH solution was added to the reaction solution, and the reaction was continued at room temperature for 2 hours. The obtained product is extracted by ether, the upper liquid phase is taken, the ether is completely volatilized, then the product is washed for 3 times, the lower oil phase is taken, and the residual moisture is removed by reduced pressure distillation, so that the epoxy resin containing diene furan-maleimide group (Diels-Alder bond) is obtained.
Then, a preparation method of the heavy anti-corrosion coating with the self-healing function comprises the following specific steps: adding a certain amount of modified epoxy resin, carbon nanofiller and diluent into a coating dispersing device for uniform dispersion, then adding an auxiliary agent and continuously stirring for 5-30 minutes to obtain a component A of the coating; adding a certain amount of amino curing agent into the diluent, and uniformly stirring and dispersing to obtain a component B of the coating; finally, A, B components of the coating are uniformly mixed together according to a certain proportion to be blended into the coating to be coated.
Finally, the application method of the heavy anti-corrosion coating with the self-healing function comprises the following specific steps: firstly, polishing or sandblasting a metal base material by using sand paper to remove rust and other impurities on the surface of the metal base material, then cleaning the metal base body by using absolute ethyl alcohol or acetone to remove oil stains, and putting the obtained clean metal base body into a dryer for storage or direct use after being dried; secondly, preparing a coating by adopting modes of spraying, brushing and the like, controlling the thickness of the coating by coating times, wherein the spraying thickness is 10-150 mu m each time, and secondly, curing the coated coating at 60 ℃ for 10 hours to obtain the coating.
Scheme II: firstly, preparing an amino curing agent containing Diels-Alder bonds, and specifically comprising the following steps: dissolving furfuryl amine in a round-bottom flask containing a certain amount of dichloromethane, and slowly dropwise adding a dichloromethane solution of di-tert-butyl carbonate (the molar ratio of furfuryl amine to di-tert-butyl carbonate is 1: 1.1) into the furfuryl amine solution at 0 ℃. The mixture was stirred at room temperature for 1 day, and after completion of the reaction, methylene chloride in the reaction mixture was evaporated, and then the reaction mixture was dissolved in ethyl acetate. The solution was washed with a saturated sodium carbonate solution and then dried over anhydrous sodium sulfate. The solution was evaporated to dryness to obtain furfuryl tertiarybutylamino formate, hereinafter referred to as compound 1. 6 g of maleic anhydride was dissolved in methylene chloride, a methylene chloride solution of 1-8-diaminooctane (molar ratio of maleic anhydride to 1, 8-diaminooctane: 3: 1) was slowly added dropwise to the maleic anhydride solution at 0 ℃ and the mixture was stirred at room temperature overnight. After the reaction, the dichloromethane in the reaction solution was removed by evaporation, the product was redissolved with acetone, and then acetic anhydride (molar ratio of acetic anhydride to 1, 8-diaminooctane: 4: 1) and nickel (II) acetate (molar ratio of acetic anhydride to nickel acetate: 200: 1) were added to the solution and stirred uniformly. The mixture was heated to 65 ℃ and reacted for 2 days. After the reaction was complete, the mixture was cooled to room temperature, the acetone was evaporated off, and the residue was poured into a large amount of ice water and stirred for 30 min. The combined product was filtered and then washed twice with water. After drying, the product 2 was obtained by purification by flash column chromatography (n-hexane: ethyl acetate =3: 1). The product 1 and the product 2 were dissolved in ethyl acetate at a molar ratio of 5:1, and the reaction mixture was heated to 78 ℃ for overnight reaction. At the end of the reaction, the solution was cooled, concentrated and the residue was purified by flash column chromatography (n-hexane: ethyl acetate =2: 1) to give product 3. The product 3 was dissolved in a certain amount of acetone solution, and then a certain amount of concentrated hydrochloric acid solution was added to the above solution at 0 ℃. The mixture was stirred at room temperature for 2 hours, the reaction was complete, the acetone was evaporated off, the residue was washed with an amount of chloroform, then an amount of water was added, and the pH of the solution was adjusted to 9 with 0.5mol/L NaOH. Then extracting with chloroform, and concentrating to obtain the modified amino curing agent.
Then, a preparation method of the heavy anti-corrosion coating with the self-healing function comprises the following specific steps: adding a certain amount of modified epoxy resin, carbon nanofiller and diluent into a coating dispersing device for uniform dispersion, then adding an auxiliary agent and continuously stirring for 5-30 minutes to obtain a component A of the coating; adding a certain amount of amino curing agent into the diluent, and uniformly stirring and dispersing to obtain a component B of the coating; finally, A, B components of the coating are uniformly mixed together according to a certain proportion to be blended into the coating to be coated.
Finally, the application method of the heavy anti-corrosion coating with the self-healing function comprises the following specific steps: firstly, polishing or sandblasting a metal base material by using sand paper to remove rust and other impurities on the surface of the metal base material, then cleaning the metal base body by using absolute ethyl alcohol or acetone to remove oil stains, and putting the obtained clean metal base body into a dryer for storage or direct use after being dried; secondly, preparing a coating by adopting modes of spraying, brushing and the like, and controlling the thickness of the coating through the coating times, wherein the spraying thickness is 10-150 mu m each time; thirdly, curing the coated coating at 60 ℃ for 10h to obtain the coating.
According to the two technical schemes, the invention has the following positive effects: the coating obtained by the reaction of the modified epoxy resin and the curing agent has good anti-corrosion performance on a metal substrate, and can realize self-repairing of a defect part for many times under the illumination condition, and recover the shielding capability on a corrosive medium.
Detailed Description
The invention relates to a heavy anti-corrosion coating with a self-healing function and a preparation method thereof, wherein the preparation takes epoxy resin-amino curing agent as a base material, firstly diene furan-maleimide group (Diels-Alder bond) is introduced into one of epoxy resin and amino curing agent, then the epoxy resin and the amino curing agent are respectively dissolved by organic solvent, carbon nano-materials such as graphene and carbon nano-tube are added into the epoxy resin solution, the mixture is stirred and mixed uniformly at high speed, then the epoxy resin and the amino curing agent are mixed according to a certain proportion, and finally the mixed solution is coated on the surface of a metal base for curing, thus obtaining the self-healing coating. The coating has simple preparation process and excellent anti-corrosion performance, and can realize self-repairing of the defect part for many times under the illumination condition and recover the shielding capability to corrosive media.
One of the epoxy resin and the curing agent contains diene furan-maleimide group (Diels-Alder bond), and the epoxy resin is required to have more than two epoxy functional groups on the molecule, the molecule of the epoxy resin is aliphatic or aromatic structure, and the molecular weight is more than 400. The diluent is one or more of toluene, xylene, isopropanol, n-butanol, ethanol and acetone. The nano filler can be one or more than two of graphene, graphene oxide and carbon nano tubes in any combination. The curing agent is amino curing agent, the molecules of the amino curing agent have more than two N-H structures, and the molecules of the curing agent are aliphatic structures or aromatic structures.
The technical solution according to the present invention is exemplified by the following examples, but the scope of the present invention is not limited thereto.
Example 1:
an epoxy resin containing a Diels-Alder bond was first prepared as follows: dissolving 8 g of tetrabutylammonium hydrogen sulfate in a round-bottom flask containing 180 mL of epoxy chloropropane, introducing nitrogen at room temperature, then slowly dropwise adding 160 mL of furfuryl alcohol into the system through a constant-pressure funnel while stirring, and continuously reacting for 4 hours at room temperature after complete dropwise addition. Then, 320 mL of a 50% NaOH solution was added to the reaction solution, and the reaction was continued at room temperature for 2 hours. The obtained product is extracted by ether, the upper liquid phase is taken, the ether is completely volatilized, then the product is washed for 3 times, the lower oil phase is taken, and the residual moisture is removed by reduced pressure distillation, so that the epoxy resin containing diene furan-maleimide group (Diels-Alder bond) is obtained.
Then preparing the heavy anti-corrosion coating with the self-healing function according to the following steps: adding the modified epoxy resin (100 g), the carbon nano tube (20 g) and the diluent (200 g) into a coating dispersing device for uniform dispersion, then adding the auxiliary agent (10 g) and continuing stirring for 30 minutes to obtain a component A of the coating; adding (50 g) amino curing agent into (80 g) diluent, and stirring and dispersing uniformly to obtain a component B of the coating; finally, A, B components of the coating are uniformly mixed together according to the mass ratio of 3:1 to prepare the coating to be coated.
Then coating according to the following process to obtain the heavy anti-corrosion coating with the self-healing function: firstly, polishing or sandblasting a metal base material by using sand paper to remove rust and other impurities on the surface of the metal base material, then cleaning the metal base body by using absolute ethyl alcohol or acetone to remove oil stains, and putting the obtained clean metal base body into a dryer for storage or direct use after being dried; secondly, preparing a coating by adopting modes of spraying, brushing and the like, controlling the thickness of the coating by coating times, wherein the thickness of each spraying is 10-150 mu m, and thirdly, curing the coated coating at 60 ℃ for 10h to obtain the coating.
Meanwhile, scratches are carved on the carbon steel coated with the modified epoxy resin coating and the pure epoxy resin coating, the two samples are simultaneously subjected to light treatment for 10min, and the coating cuts are observed through a microscope, so that the coating cuts coated with the modified epoxy resin are fuzzy and even disappear, the pure epoxy resin coating has no obvious change, and the modified epoxy resin coating has good self-healing performance. The coating was then immersed in a.5% NaCl solution for comparison of corrosion resistance. The results show that the carbon steel coated with the modified epoxy resin coating has better corrosion resistance than the pure epoxy resin coating to the carbon steel.
Example 2:
the present embodiment differs from embodiment 1 in that: graphene (20 g) was selected as the carbon nanomaterial, and the rest was the same as in example 1.
Example 3:
firstly, preparing an amino curing agent containing Diels-Alder bonds according to the following steps: dissolving furfuryl amine in a round-bottom flask containing a certain amount of dichloromethane, and slowly dropwise adding a dichloromethane solution of di-tert-butyl carbonate (the molar ratio of furfuryl amine to di-tert-butyl carbonate is 1: 1.1) into the furfuryl amine solution at 0 ℃. The mixture was stirred at room temperature for 1 day, and after completion of the reaction, methylene chloride in the reaction mixture was evaporated, and then the reaction mixture was dissolved in ethyl acetate. The solution was washed with a saturated sodium carbonate solution and then dried over anhydrous sodium sulfate. The solution was evaporated to dryness to obtain furfuryl tertiarybutylamino formate, hereinafter referred to as compound 1. 6 g of maleic anhydride was dissolved in methylene chloride, a methylene chloride solution of 1-8-diaminooctane (molar ratio of maleic anhydride to 1, 8-diaminooctane: 3: 1) was slowly added dropwise to the maleic anhydride solution at 0 ℃ and the mixture was stirred at room temperature overnight. After the reaction, the dichloromethane in the reaction solution was removed by evaporation, the product was redissolved with acetone, and then acetic anhydride (molar ratio of acetic anhydride to 1, 8-diaminooctane: 4: 1) and nickel (II) acetate (molar ratio of acetic anhydride to nickel acetate: 200: 1) were added to the solution and stirred uniformly. The mixture was heated to 65 ℃ and reacted for 2 days. After the reaction was complete, the mixture was cooled to room temperature, the acetone was evaporated off, and the residue was poured into a large amount of ice water and stirred for 30 min. The combined product was filtered and then washed twice with water. After drying, the product 2 was obtained by purification by flash column chromatography (n-hexane: ethyl acetate =3: 1). The product 1 and the product 2 were dissolved in ethyl acetate at a molar ratio of 5:1, and the reaction mixture was heated to 78 ℃ for overnight reaction. At the end of the reaction, the solution was cooled, concentrated and the residue was purified by flash column chromatography (n-hexane: ethyl acetate =2: 1) to give product 3. The product 3 was dissolved in a certain amount of acetone solution, and then a certain amount of concentrated hydrochloric acid solution was added to the above solution at 0 ℃. The mixture was stirred at room temperature for 2 hours, the reaction was complete, the acetone was evaporated off, the residue was washed with an amount of chloroform, then an amount of water was added, and the pH of the solution was adjusted to 9 with 0.5mol/L NaOH. Then extracting with chloroform, and concentrating to obtain the modified amino curing agent.
Then preparing a preparation method of the heavy anti-corrosion coating with the self-healing function according to the following steps: adding the modified epoxy resin (100 g), the carbon nano tube (20 g) and the diluent (200 g) into a coating dispersing device for uniform dispersion, then adding the auxiliary agent (10 parts), and continuing stirring for 30 minutes to obtain a component A of the coating; adding (50 g) amino curing agent into (80 g) diluent, and stirring and dispersing uniformly to obtain a component B of the coating; finally, A, B components of the coating are uniformly mixed together according to the mass ratio of 3:1 to prepare the coating to be coated.
Then coating according to the following process to obtain the heavy anti-corrosion coating: firstly, polishing or sandblasting a metal base material by using sand paper to remove rust and other impurities on the surface of the metal base material, then cleaning the metal base body by using absolute ethyl alcohol or acetone to remove oil stains, and putting the obtained clean metal base body into a dryer for storage or direct use after being dried; secondly, preparing a coating by adopting modes of spraying, brushing and the like, controlling the thickness of the coating by coating times, wherein the thickness of each spraying is 10-150 mu m, and thirdly, curing the coated coating at 60 ℃ for 10h to obtain the coating.
Respectively engraving scratches on the carbon steel coated with the modified epoxy coating and the pure epoxy resin coating, simultaneously carrying out illumination treatment on the two samples for 10min, observing the coating cuts through a microscope, and finding that the coating cuts coated with the modified epoxy resin are fuzzy or even disappear, while the pure epoxy resin coating has no obvious change, and the modified epoxy resin coating has good self-healing performance. The coating was then immersed in a 3.5% NaCl solution to compare corrosion resistance. The results show that the carbon steel coated with the epoxy coating has better corrosion resistance to the carbon steel than the pure epoxy coating.
Example 4:
the present embodiment differs from embodiment 1 in that: graphene (20 g) was selected as the carbon nanomaterial, and the rest was the same as in example 3.
The performance test results of the self-healing heavy-duty anticorrosive paint and the pure epoxy resin prepared by the four examples are shown in the following table:
| detailed description of the preferred embodiments | adhesion/MPa | Self-healing performance | Corrosion resistance |
| Example 1 | 6.7 | Superior food | Superior food |
| Example 2 | 6.6 | Superior food | Superior food |
| Example 3 | 6.3 | Superior food | Superior food |
| Example 4 | 6.6 | Superior food | Superior food |
| E44 resin | 5.3 | Is free of | In general |
As shown in the table, the heavy anti-corrosion coating prepared by the invention can realize self-repairing of the defect under the illumination condition, and the coating shows good corrosion performance after self-repairing.
The invention has the outstanding advantages that: by introducing a Diels-Alder bond into an epoxy resin-curing agent system, the obtained coating has good anti-corrosion performance on a metal substrate, and the coating can realize self-repairing of a defective part for many times under the illumination condition and recover the shielding capability on a corrosive medium.
The invention aims to provide a coating which can realize self-repairing of surface defects for many times by illumination heating no matter in a water environment or a dry environment, and the coating has good corrosion performance after being repaired.
The above embodiments are merely illustrative of the technical solutions and features of the present invention, and the purpose thereof is to better enable those skilled in the art to practice the invention, and it is not intended to limit the scope of the invention, and all equivalent changes and modifications made according to the spirit of the present invention are within the scope of the present invention, wherein the prior art is not described in detail.
Claims (9)
1. The heavy-duty anticorrosive paint with the self-healing function is characterized in that the coating consists of a component A and a component B, and comprises the following raw materials in parts by mass:
1) the component A comprises:
epoxy resin 100
0-100 parts of carbon nano filler
0 to 100 parts of other fillers
0 to 50% of an auxiliary
0-400% of diluent
2) And B component:
0 to 100 parts of a curing agent
0 to 100 parts of diluent
The molecules of the epoxy resin in the component A are provided with more than two epoxy functional groups, the molecules of the epoxy resin are in an aliphatic or aromatic structure, and the molecular weight of the epoxy resin is more than 400;
the curing agent in the component B is an amino curing agent, the molecules of the amino curing agent are provided with more than two N-H structures, and the molecules of the curing agent are aliphatic structures or aromatic structures;
wherein one of the epoxy resin and the amino curing agent is modified by introducing diene furan-maleimide group.
2. The heavy-duty anticorrosive coating with a self-healing function according to claim 1, characterized in that the coating is composed of a component a and a component B, and comprises the following raw materials in parts by mass:
1) the component A comprises:
epoxy resin 100
10-40% of carbon nanofiller
0 to 20 parts of other fillers
0-20% of an auxiliary agent
200-300% of diluent
2) And B component:
40-80 parts of curing agent
50-100 parts of diluent.
3. The heavy-duty anticorrosive coating with a self-healing function according to claim 1, characterized in that the auxiliary agent in the component a is one or any combination of two or more of a defoaming agent, a mildewproof agent, an adhesion promoter, a drier, a toughening agent, a thickener, an anti-skinning agent, a matting agent, a light stabilizer, a leveling agent, and an antistatic agent.
4. The heavy-duty anticorrosive paint with a self-healing function according to claim 1, characterized in that the diluent used in the component a is one or any combination of two or more of toluene, xylene, isopropanol, n-butanol, ethanol, and acetone.
5. The heavy-duty anticorrosive paint with self-healing function according to claim 1, wherein the carbon nanofiller is one or more of graphene, graphene oxide, and carbon nanotubes in any combination.
6. The heavy-duty anticorrosive paint with a self-healing function according to claim 1, wherein the other filler is any combination of aluminum filler, zinc powder, exfoliated flake, and mica flake.
7. The preparation method of the heavy anti-corrosion coating with the self-healing function according to claim 1, characterized by comprising the following steps:
adding epoxy resin, carbon nano filler and a diluent into a coating dispersing device for uniform dispersion, and then adding an auxiliary agent for grinding for 5-30 minutes to obtain a component A of the coating;
adding a curing agent into the diluent, and uniformly stirring and dispersing to obtain a component B of the coating; finally, A, B components of the paint are uniformly mixed together according to a proportion to prepare the paint to be coated.
8. The method for preparing a heavy duty anticorrosive paint with a self-healing function according to claim 1, wherein A, B components of the paint are uniformly mixed in a mass ratio of 3: 1.
9. The use method of the heavy anti-corrosion coating with the self-healing function according to claim 1, characterized by comprising the following steps:
s1, polishing or sandblasting the metal substrate by using sand paper, removing rust and other impurities on the surface of the metal substrate, cleaning the metal substrate by using absolute ethyl alcohol or acetone to remove oil stains, and putting the obtained clean metal substrate into a dryer for storage or direct use after being dried;
s2, preparing a coating by adopting a spraying or brushing mode, and controlling the thickness of the coating by the coating times, wherein the spraying thickness is 10-150 mu m each time;
and S3, curing the coated coating at 60 ℃ for 10h to obtain the coating with the self-healing function.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110264016.3A CN112920689A (en) | 2021-03-11 | 2021-03-11 | Heavy-duty anticorrosive paint with self-healing function and preparation and use methods thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110264016.3A CN112920689A (en) | 2021-03-11 | 2021-03-11 | Heavy-duty anticorrosive paint with self-healing function and preparation and use methods thereof |
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| CN112920689A true CN112920689A (en) | 2021-06-08 |
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| CN202110264016.3A Withdrawn CN112920689A (en) | 2021-03-11 | 2021-03-11 | Heavy-duty anticorrosive paint with self-healing function and preparation and use methods thereof |
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| CN115232537A (en) * | 2022-07-28 | 2022-10-25 | 国网福建省电力有限公司电力科学研究院 | Photo-thermal response intelligent coating and preparation method thereof |
| CN118389029A (en) * | 2024-07-01 | 2024-07-26 | 中国计量大学 | High-efficiency self-healing anti-corrosion coating based on microfluidics and preparation method thereof |
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| CN115232537A (en) * | 2022-07-28 | 2022-10-25 | 国网福建省电力有限公司电力科学研究院 | Photo-thermal response intelligent coating and preparation method thereof |
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