CN108329805B - Anticorrosive paint for sheet metal of outdoor unit box body of air conditioner and preparation method of anticorrosive paint - Google Patents
Anticorrosive paint for sheet metal of outdoor unit box body of air conditioner and preparation method of anticorrosive paint Download PDFInfo
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- CN108329805B CN108329805B CN201810101404.8A CN201810101404A CN108329805B CN 108329805 B CN108329805 B CN 108329805B CN 201810101404 A CN201810101404 A CN 201810101404A CN 108329805 B CN108329805 B CN 108329805B
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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
- C09D167/00—Coating compositions based on polyesters obtained by reactions forming a carboxylic ester link in the main chain; Coating compositions based on derivatives of such polymers
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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
-
- 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
- C09D7/62—Additives non-macromolecular inorganic modified by treatment with other compounds
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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
- C09D7/63—Additives non-macromolecular organic
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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
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2237—Oxides; Hydroxides of metals of titanium
- C08K2003/2241—Titanium dioxide
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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
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
- C08K2003/265—Calcium, strontium or barium carbonate
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
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- C—CHEMISTRY; METALLURGY
- 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
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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- C—CHEMISTRY; METALLURGY
- 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
Abstract
The invention provides an anticorrosive paint for a sheet metal of an outdoor unit box of an air conditioner and a preparation method thereof. The anticorrosive paint comprises the following components in parts by weight: 50-90 parts of carboxyl-terminated polyester resin, 10-50 parts of organic silicon modified polyester resin, 10-25 parts of triglycidyl isocyanurate, 5-10 parts of a flatting agent, 0.5-1 part of benzoin, 0.5-1.0 part of a coupling agent, 5-25 parts of titanium dioxide and 5-25 parts of activated calcium carbonate.
Description
Technical Field
The invention belongs to the technical field of coatings, and particularly relates to an anticorrosive coating for a sheet metal of an outdoor unit box of an air conditioner and a preparation method of the anticorrosive coating.
Background
The sheet metal material is widely applied to the box body of the outdoor unit of the air conditioner, and is very easy to rust and corrode when exposed to the external environment for a long time. In order to prolong the service life of the sheet metal material of the outdoor unit box body of the air conditioner, powder coating is usually sprayed on the surface of the sheet metal material in an electrostatic spraying mode, and then the powder coating is heated at high temperature to react to form a compact protective layer, so that a corrosive medium can be isolated from the sheet metal material by the protective layer, and the sheet metal material is prevented from being corroded.
At present, most of powder coatings for sheet metal of an outdoor unit box body of an air conditioner are common polyester powder coatings, and the ultraviolet light aging resistant time is 500 hours, and the salt spray corrosion resistant time is 500 hours. However, in a severe marine atmosphere environment, the common polyester powder coating cannot resist the damage of salt mist and ultraviolet rays in the environment, and the protective layer is easy to damage and fail. At present, fluorocarbon powder coating has been developed, the ultraviolet light aging resistance time of the fluorocarbon powder coating is 1000 hours, the salt spray corrosion resistance time of the fluorocarbon powder coating is 1000 hours, and the fluorocarbon powder coating can meet the use requirements of air conditioners in marine atmospheric environment, but the fluorocarbon powder coating has high preparation cost and great popularization and application difficulty. In addition, compared with common polyester resin, the organic silicon resin has more excellent ultraviolet light aging resistance and salt spray corrosion resistance, but the problem that the anticorrosion coating prepared by only using the organic silicon resin is expensive and poor in adhesion to a base material exists, and the organic silicon overflow phenomenon can occur due to the poor compatibility of the organic silicon resin and the polyester resin when the organic silicon resin and the polyester resin are used in a mixed manner, so that the overall performance of the coating film is poor.
Therefore, how to provide an anticorrosive coating with low cost, excellent ultraviolet light aging resistance and excellent salt spray corrosion resistance to meet the use requirements of air conditioners in marine atmospheric environments is a technical problem which is urgently needed to be solved at present.
Disclosure of Invention
Aiming at the technical problems, the invention provides the anticorrosive paint for the sheet metal of the outdoor unit box body of the air conditioner and the preparation method thereof.
In order to achieve the purpose, the invention adopts the technical scheme that:
the invention provides an anticorrosive paint for a sheet metal of an outdoor unit box body of an air conditioner, which comprises the following components in parts by weight: 50-90 parts of carboxyl-terminated polyester resin, 10-50 parts of organic silicon modified polyester resin, 10-25 parts of triglycidyl isocyanurate, 5-10 parts of a flatting agent, 0.5-1 part of benzoin, 0.5-1.0 part of a coupling agent, 5-25 parts of titanium dioxide and 5-25 parts of activated calcium carbonate.
Preferably, the anticorrosive paint for the sheet metal of the outdoor unit box of the air conditioner comprises the following components in parts by weight: 50 parts of carboxyl-terminated polyester resin, 50 parts of organic silicon modified polyester resin, 25 parts of triglycidyl isocyanurate, 10 parts of a flatting agent, 1 part of benzoin, 1.0 part of a coupling agent, 25 parts of titanium dioxide and 5 parts of active calcium carbonate.
Preferably, the carboxyl-terminated polyester resin has a softening point of 85 to 100 ℃.
Preferably, the hydroxyl content of the organic silicon modified polyester resin is 3-5%, and the softening point is 85-100 ℃.
Preferably, the leveling agent is formed by mixing polyester powder and butyl acrylate polymerization emulsion.
Preferably, the mass percentage content of the butyl acrylate polymerization emulsion in the leveling agent is 10%.
Preferably, the coupling agent is a silane coupling agent selected from any one of KH570, KH560 and KH 550.
The invention also provides a preparation method of the anticorrosive paint for the sheet metal of the outdoor unit box body of the air conditioner, which comprises the following steps of: adding titanium dioxide into the coupling agent, and stirring and mixing for 30min on a high-speed stirrer; and drying the obtained mixture, mixing the dried mixture with carboxyl-terminated polyester resin, organic silicon modified polyester resin, triglycidyl isocyanurate, a leveling agent, benzoin and active calcium carbonate, stirring and mixing for 5-10 min on a high-speed stirrer, adding the mixture into a double-screw extruder, melting and mixing at 100-120 ℃, extruding, cold cutting, crushing, screening and packaging to obtain the anticorrosive coating for the sheet metal of the outdoor unit box of the air conditioner.
Compared with the prior art, the invention has the advantages and positive effects that:
1. according to the anti-corrosive coating for the sheet metal of the outdoor unit box body of the air conditioner, the organic silicon modified polyester resin is added into the carboxyl-terminated polyester resin, the ultraviolet light aging resistance and the hydrophobicity of the coating can be improved by utilizing the silicon-containing group of the organic silicon modified polyester resin, the salt spray corrosion resistance of the coating can be enhanced by improving the hydrophobicity, the ultraviolet light aging resistance time of the obtained anti-corrosive coating is 1000 hours, the salt spray corrosion resistance time of the obtained anti-corrosive coating is 1000 hours, and the use requirement of the air conditioner in the marine atmospheric environment can be met;
2. in the anticorrosive paint for the sheet metal of the outdoor unit box body of the air conditioner, both the organic silicon modified polyester resin and the carboxyl-terminated polyester resin have ester chain segments, the two resins can realize entanglement among the molecular chain segments after being melted, the compatibility is good, the two resins can be used together, the preparation cost of the paint can be reduced, the organic silicon overflow phenomenon caused by incompatibility can be avoided, and the preparation method is simple and is beneficial to popularization and application.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the invention provides an anticorrosive paint for a sheet metal of an outdoor unit box of an air conditioner, which comprises the following components in parts by weight: 50-90 parts of carboxyl-terminated polyester resin, 10-50 parts of organic silicon modified polyester resin, 10-25 parts of triglycidyl isocyanurate, 5-10 parts of a flatting agent, 0.5-1 part of benzoin, 0.5-1.0 part of a coupling agent, 5-25 parts of titanium dioxide and 5-25 parts of activated calcium carbonate.
In the anticorrosive coating for the sheet metal of the outdoor unit box body of the air conditioner, the organic silicon modified polyester resin is added into the carboxyl-terminated polyester resin, and the ultraviolet light aging resistance and the hydrophobicity of the coating can be improved by utilizing the silicon-containing group of the organic silicon modified polyester resin, so that the salt spray corrosion resistance of the coating can be enhanced by improving the hydrophobicity, and the obtained anticorrosive coating has excellent ultraviolet light aging resistance and salt spray corrosion resistance. Meanwhile, ester chain segments are arranged in the organic silicon modified polyester resin and the carboxyl-terminated polyester resin, the two resins can realize entanglement among the molecular chain segments after being melted, the compatibility is good, the preparation cost of the coating can be reduced by using the two resins together, and the organic silicon overflow phenomenon caused by incompatibility can be avoided.
It is understood that, in the above anticorrosive coating for sheet metal of outdoor unit box of air conditioner, the added weight parts of each component can be adjusted within the above range, for example, the carboxyl-terminated polyester resin can be 50, 60, 70, 80 or 90 parts, etc., the silicone modified polyester resin can be 10, 20, 30, 40 or 50 parts, etc., the triglycidyl isocyanurate can be 10, 15, 20 or 25 parts, etc., the leveling agent can be 5, 6, 7, 8, 9 or 10 parts, etc., the benzoin can be 0.5, 0.6, 0.7, 0.8, 0.9 or 1.0 part, etc., the coupling agent can be 0.5, 0.6, 0.7, 0.8, 0.9 or 1.0 part, etc., the titanium dioxide can be 5, 10, 15, 20 or 25 parts, etc., and the activated calcium carbonate can be 5, 10, 15, 20 or 25 parts, etc.
In a preferred embodiment, the anticorrosive paint for the sheet metal of the outdoor unit box of the air conditioner comprises the following components in parts by weight: 50 parts of carboxyl-terminated polyester resin, 50 parts of organic silicon modified polyester resin, 25 parts of triglycidyl isocyanurate, 10 parts of a flatting agent, 1 part of benzoin, 1.0 part of a coupling agent, 25 parts of titanium dioxide and 5 parts of active calcium carbonate. The proportion is the optimal proportion, and the obtained anticorrosive paint has the best comprehensive performance.
In a preferred embodiment, the softening point of the carboxyl-terminated polyester resin is 85-100 ℃. In the preferred embodiment, the softening point of the carboxyl-terminated polyester resin is further limited, and the carboxyl-terminated polyester resin with the softening point of 85-100 ℃ is adopted, so that the compatibility with the organic silicon modified polyester resin is facilitated.
In a preferred embodiment, the hydroxyl content of the organic silicon modified polyester resin is 3-5%, and the softening point is 85-100 ℃. In the preferred embodiment, the used organic silicon modified polyester resin is further limited, and the organic silicon modified polyester resin with the hydroxyl content of 3-5% and the softening point of 85-100 ℃ is adopted, so that the organic silicon modified polyester resin is more favorably compatible with the carboxyl-terminated polyester resin, and is favorable for obtaining the anticorrosive paint with more excellent ultraviolet light aging resistance and salt spray corrosion resistance.
In a preferred embodiment, the leveling agent is formed by mixing polyester powder and butyl acrylate polymerization emulsion, and the adoption of the leveling agent is more beneficial to being matched with carboxyl-terminated polyester resin and organic silicon modified polyester resin, so that the surface tension of a coating film is reduced, and the leveling property and uniformity of the coating are improved.
In a further preferred embodiment, the mass percentage content of the butyl acrylate polymerization emulsion in the leveling agent is 10%. In the preferred embodiment, the mass percentage of the butyl acrylate polymerization emulsion in the leveling agent is further defined, and when the mass percentage of the butyl acrylate polymerization emulsion is 10%, the obtained leveling agent has the best performance.
In a preferred embodiment, the coupling agent is a silane coupling agent selected from any one of KH570, KH560 and KH 550. Compared with other types of coupling agents, the silane coupling agent is more beneficial to the melt crosslinking of carboxyl-terminated polyester resin and organic silicon modified polyester resin. It is understood that the selected type of silane coupling agent is not limited to the above list, but any other silane coupling agent that can achieve the same effect can be used, but from the overall formulation point of view, the use of the silane coupling agent of the above type is more beneficial to improve the ultraviolet light aging resistance and the salt spray corrosion resistance of the anticorrosive coating.
The embodiment of the invention also provides a preparation method of the anticorrosive paint for the sheet metal of the outdoor unit box body of the air conditioner, which comprises the following steps: adding titanium dioxide into the coupling agent, and stirring and mixing for 30min on a high-speed stirrer; and drying the obtained mixture, mixing the dried mixture with carboxyl-terminated polyester resin, organic silicon modified polyester resin, triglycidyl isocyanurate, a leveling agent, benzoin and active calcium carbonate, stirring and mixing for 5-10 min on a high-speed stirrer, adding the mixture into a double-screw extruder, melting and mixing at 100-120 ℃, extruding, cold cutting, crushing, screening and packaging to obtain the anticorrosive coating for the sheet metal of the outdoor unit box of the air conditioner.
In order to more clearly and specifically describe the anticorrosive paint for the sheet metal of the outdoor unit box of the air conditioner and the preparation method thereof according to the embodiment of the invention, the following description will be given with reference to specific embodiments.
Example 1
The anticorrosive paint for the sheet metal of the outdoor unit box body of the air conditioner comprises the following components in parts by weight: 50 parts of carboxyl-terminated polyester resin, 50 parts of organic silicon modified polyester resin, 25 parts of triglycidyl isocyanurate, 10 parts of a flatting agent, 1 part of benzoin, KH 5501.0 parts of a silane coupling agent, 25 parts of titanium dioxide and 5 parts of active calcium carbonate; wherein the softening point of the carboxyl-terminated polyester resin is 85-100 ℃; the hydroxyl content of the organic silicon modified polyester resin is 3-5%, and the softening point is 85-100 ℃; the leveling agent is formed by mixing polyester powder and butyl acrylate polymerization emulsion, and the mass percentage of the butyl acrylate polymerization emulsion in the leveling agent is 10%.
The preparation method comprises the following steps: adding titanium dioxide into the coupling agent, and stirring and mixing for 30min on a high-speed stirrer; and drying the obtained mixture, mixing the dried mixture with carboxyl-terminated polyester resin, organic silicon modified polyester resin, triglycidyl isocyanurate, a leveling agent, benzoin and active calcium carbonate, stirring and mixing for 5-10 min on a high-speed stirrer, adding the mixture into a double-screw extruder, melting and mixing at 100-120 ℃, extruding, cold cutting, crushing, screening and packaging to obtain the anticorrosive coating for the sheet metal of the outdoor unit box of the air conditioner.
Example 2
The anticorrosive paint for the sheet metal of the outdoor unit box body of the air conditioner comprises the following components in parts by weight: 75 parts of carboxyl-terminated polyester resin, 25 parts of organic silicon modified polyester resin, 15 parts of triglycidyl isocyanurate, 7.5 parts of a flatting agent, 0.75 part of benzoin, 15 parts of titanium dioxide and 15 parts of activated calcium carbonate; wherein the softening point of the carboxyl-terminated polyester resin is 85-100 ℃; the hydroxyl content of the organic silicon modified polyester resin is 3-5%, and the softening point is 85-100 ℃; the leveling agent is formed by mixing polyester powder and butyl acrylate polymerization emulsion, and the mass percentage of the butyl acrylate polymerization emulsion in the leveling agent is 10%.
The preparation method comprises the following steps: adding titanium dioxide into the coupling agent, and stirring and mixing for 30min on a high-speed stirrer; and drying the obtained mixture, mixing the dried mixture with carboxyl-terminated polyester resin, organic silicon modified polyester resin, triglycidyl isocyanurate, a leveling agent, benzoin and active calcium carbonate, stirring and mixing for 5-10 min on a high-speed stirrer, adding the mixture into a double-screw extruder, melting and mixing at 100-120 ℃, extruding, cold cutting, crushing, screening and packaging to obtain the anticorrosive coating for the sheet metal of the outdoor unit box of the air conditioner.
Example 3
The anticorrosive paint for the sheet metal of the outdoor unit box body of the air conditioner comprises the following components in parts by weight: 90 parts of carboxyl-terminated polyester resin, 10 parts of organic silicon modified polyester resin, 10 parts of triglycidyl isocyanurate, 5 parts of a flatting agent, 0.5 part of benzoin, 5 parts of silane coupling agent KH 5700.5, 5 parts of titanium dioxide and 25 parts of active calcium carbonate; wherein the softening point of the carboxyl-terminated polyester resin is 85-100 ℃; the hydroxyl content of the organic silicon modified polyester resin is 3-5%, and the softening point is 85-100 ℃; the leveling agent is formed by mixing polyester powder and butyl acrylate polymerization emulsion, and the mass percentage of the butyl acrylate polymerization emulsion in the leveling agent is 10%.
The preparation method comprises the following steps: adding titanium dioxide into the coupling agent, and stirring and mixing for 30min on a high-speed stirrer; and drying the obtained mixture, mixing the dried mixture with carboxyl-terminated polyester resin, organic silicon modified polyester resin, triglycidyl isocyanurate, a leveling agent, benzoin and active calcium carbonate, stirring and mixing for 5-10 min on a high-speed stirrer, adding the mixture into a double-screw extruder, melting and mixing at 100-120 ℃, extruding, cold cutting, crushing, screening and packaging to obtain the anticorrosive coating for the sheet metal of the outdoor unit box of the air conditioner.
Performance testing
The anticorrosive coatings prepared in examples 1 to 3 and the conventional common polyester powder coating are respectively uniformly sprayed on galvanized metal sheets (200mm × 200mm × 1mm) subjected to pretreatment (cleaning with alkaline solution, cleaning with water, drying, spraying with phosphating solution and drying again) by using an electrostatic spraying device (voltage 50KV, air pressure 0.05MPa and spraying distance 20cm), vertically hung in an oven at 200 ℃ for 20min to form a coating with a film thickness of 50 μm, naturally cooled to room temperature, placed for 16h, and then the coating performance is measured, wherein the measurement results of the coating performance are shown in table 1:
TABLE 1 coating Performance test results
As can be seen from table 1, the coating formed by the anticorrosive coating provided in the embodiment of the present invention has an ultraviolet light aging resistance of 1000 hours and a salt spray corrosion resistance of 1000 hours, and can meet the use requirements of an air conditioner in a marine atmospheric environment, and the ultraviolet light aging resistance and the salt spray corrosion resistance of the coating are improved while other properties such as hardness, adhesion, impact strength, and the like of the coating are not reduced.
Claims (6)
1. The anticorrosive paint for the sheet metal of the outdoor unit box body of the air conditioner is characterized by comprising the following components in parts by weight:
50-90 parts of carboxyl-terminated polyester resin, 10-50 parts of organic silicon modified polyester resin, 10-25 parts of triglycidyl isocyanurate, 5-10 parts of a flatting agent, 0.5-1 part of benzoin, 0.5-1.0 part of a coupling agent, 5-25 parts of titanium dioxide and 5-25 parts of activated calcium carbonate; the softening point of the carboxyl-terminated polyester resin is 85-100 ℃, the hydroxyl content of the organic silicon modified polyester resin is 3-5%, and the softening point is 85-100 ℃.
2. The anticorrosive paint for the sheet metal of the outdoor unit box body of the air conditioner as claimed in claim 1, which comprises the following components in parts by weight: 50 parts of carboxyl-terminated polyester resin, 50 parts of organic silicon modified polyester resin, 25 parts of triglycidyl isocyanurate, 10 parts of a flatting agent, 1 part of benzoin, 1.0 part of a coupling agent, 25 parts of titanium dioxide and 5 parts of active calcium carbonate.
3. The anticorrosive paint for the sheet metal of the outdoor unit box of the air conditioner as claimed in claim 1 or 2, wherein: the leveling agent is formed by mixing polyester powder and butyl acrylate polymerization emulsion.
4. The anticorrosive paint for sheet metal of an outdoor unit box of an air conditioner according to claim 3, characterized in that: the mass percentage content of the butyl acrylate polymerization emulsion in the leveling agent is 10%.
5. The anticorrosive paint for the sheet metal of the outdoor unit box of the air conditioner as claimed in claim 1 or 2, wherein: the coupling agent is a silane coupling agent and is selected from any one of KH570, KH560 and KH 550.
6. The method for preparing the anticorrosive paint for the sheet metal of the outdoor unit box of the air conditioner as claimed in any one of claims 1 to 5, characterized by comprising the steps of: adding titanium dioxide into the coupling agent, and stirring and mixing for 30min on a high-speed stirrer; and drying the obtained mixture, mixing the dried mixture with carboxyl-terminated polyester resin, organic silicon modified polyester resin, triglycidyl isocyanurate, a leveling agent, benzoin and active calcium carbonate, stirring and mixing for 5-10 min on a high-speed stirrer, adding the mixture into a double-screw extruder, melting and mixing at 100-120 ℃, extruding, cold cutting, crushing, screening and packaging to obtain the anticorrosive coating for the sheet metal of the outdoor unit box of the air conditioner.
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| CN101851460A (en) * | 2010-06-04 | 2010-10-06 | 江苏兰陵高分子材料有限公司 | Polyester powder coating for solar water heater |
| CN103059701A (en) * | 2012-12-21 | 2013-04-24 | 北京京能恒基新材料有限公司 | Powder solar heat reflecting paint and preparation method thereof |
| CN103073711A (en) * | 2012-12-28 | 2013-05-01 | 广州擎天材料科技有限公司 | Organosilicone modified carboxyl-terminated polyester resin for TGIC heat-resistant powder coating and preparation method thereof |
| CN106675348A (en) * | 2017-01-19 | 2017-05-17 | 广东华江粉末科技有限公司 | Powder coating for aluminum template and preparation method and application of powder coating |
| CN107586508A (en) * | 2017-08-18 | 2018-01-16 | 安徽华辉塑业科技股份有限公司 | A kind of high-decoration powdery paints applied on fork truck outer surface |
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