CN116042062A - Water-based low-temperature baking coating and application method thereof - Google Patents
Water-based low-temperature baking coating and application method thereof Download PDFInfo
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- CN116042062A CN116042062A CN202211585582.5A CN202211585582A CN116042062A CN 116042062 A CN116042062 A CN 116042062A CN 202211585582 A CN202211585582 A CN 202211585582A CN 116042062 A CN116042062 A CN 116042062A
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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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- 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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- 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
- B05D7/26—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 synthetic lacquers or varnishes
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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
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/18—Fireproof paints including high temperature resistant paints
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- 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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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/02—Flame or fire retardant/resistant
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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
- C08L2201/10—Transparent films; Clear coatings; Transparent materials
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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
- C08L2312/00—Crosslinking
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Abstract
The invention discloses a water-based low-temperature baking coating and a use method thereof, wherein the water-based low-temperature baking coating comprises the following components in percentage by mass: 50-60% of water-based special modified polyester resin, 10-15% of water-based amino resin, 0.2-0.8% of cooling agent, 2-5% of adhesion promoter, 0.2-0.5% of leveling agent, 0.1-0.5% of defoaming agent, 2-5% of neutralizer and 20-40% of deionized water. The application method comprises the following steps: obtaining a water-based low-temperature baking coating, diluting the water-based low-temperature baking coating with deionized water, and coating the diluted water-based low-temperature baking coating on the surface of a pretreated workpiece; and drying the workpiece to obtain the coated workpiece. The aqueous low-temperature baking coating has excellent acid resistance, high transparency, high hardness, good flexibility of a paint film, and low content of Volatile Organic Compounds (VOC), and accords with the environment-friendly and environment-friendly concepts. The application method can be used for coating the surface of the pretreated workpiece after the coating is diluted by water, and the steps are simple and convenient, and the construction and the industrial application are convenient.
Description
Technical Field
The invention relates to the technical field of coatings, in particular to a water-based low-temperature baking coating and a use method thereof.
Background
With the development and progress of science and technology, various metal products can be manufactured by using metal. While corrosion resistance and weatherability of metal articles have been one of the major factors affecting their useful life. In order to improve the corrosion resistance and weather resistance, the metal surface is generally subjected to spray coating treatment to enhance the corrosion resistance, so that the service life of the metal is prolonged. At present, most of the paint used on the surface of metal products is oil solvent paint, so as to meet the requirements of corrosion resistance and weather resistance of the products.
However, in the surface treatment process of the conventional metal product, since the carrier of the oily solvent-based paint is a volatile organic solvent, the organic solvent in the oily paint continuously volatilizes organic compounds to the atmosphere during the film forming process and the subsequent use process. These volatile organic compounds are released into the air continuously, which not only causes pollution to the environment, but also causes a certain harm to the health of human bodies.
Disclosure of Invention
Based on the above, it is necessary to provide an aqueous low-temperature baking coating and a method for using the same, aiming at the technical problem that the volatile organic compounds are continuously released into the air to cause environmental pollution.
The water-based low-temperature baking coating comprises the following components in percentage by mass:
50-60% of water-based special modified polyester resin, 10-15% of water-based amino resin, 0.2-0.8% of cooling agent, 2-5% of adhesion promoter, 0.2-0.5% of leveling agent, 0.1-0.5% of defoaming agent, 2-5% of neutralizer and 20-40% of deionized water.
In one embodiment, the aqueous specially modified polyester resin is obtained by specially modifying and polymerizing a polyol and a polybasic acid.
In one embodiment, the aqueous amino resin is a methyl etherified high imino melamine resin.
In one embodiment, the cooling agent is a closed acid catalyst and the defoaming agent is an organosilicon defoaming agent.
In one embodiment, the adhesion promoter is an aryl or alkyl phosphate.
In one embodiment, the leveling agent is a siloxane, polyester, or alkyl vinyl ether copolymer.
In one embodiment, the neutralizing agent is N, N-dimethylethanolamine.
The aqueous low-temperature baking coating comprises the components of aqueous special modified polyester resin, aqueous amino resin and the like, wherein the reactive groups contained in the aqueous special modified polyester resin chain are subjected to crosslinking reaction with the aqueous amino resin, so that the performances of acid resistance, flexibility, hardness and the like of the coating can be effectively improved. The water-based low-temperature baking coating provided by the invention has excellent acid resistance, high transparency, good flexibility of a paint film, high hardness, low content of Volatile Organic Compounds (VOC) and the like through the synergistic crosslinking effect among the components such as the water-based special modified polyester resin, the water-based amino resin, the adhesion promoter and the like, and accords with the environment-friendly and environmental protection concepts.
The invention also provides a use method of the water-based low-temperature baking paint, which comprises the following steps:
obtaining a water-based low-temperature baking coating, diluting the water-based low-temperature baking coating by deionized water, and obtaining the diluted water-based low-temperature baking coating;
coating the diluted water-based low-temperature baking paint on the surface of the pretreated workpiece;
and drying the workpiece to obtain the coated workpiece.
In one embodiment, the step of diluting the aqueous low temperature baking coating with deionized water comprises: the aqueous low-temperature baking paint is diluted by deionized water until the viscosity is that of a rock field No. 2 cup, the outflow time is 18-30 seconds, and the ambient temperature is 25 ℃.
In one embodiment, the step of drying the workpiece to obtain a coated workpiece includes: drying in an oven or tunnel at 110-120 deg.c for 30-40 min.
According to the application method of the water-based low-temperature baking coating, the coating can be coated on the surface of the pretreated workpiece after being diluted by water, and can be dried after coating is finished, and then the coated workpiece can be obtained. The aqueous low-temperature baking coating provided by the invention has the advantages of low VOC content, reduced emission of organic solvents in the atmosphere, reduced atmospheric pollution, safe use, environmental protection and good construction property. Meanwhile, the water-based low-temperature baking coating provided by the invention has nonflammable fireproof performance, effectively reduces fire disaster, is safer to produce, store and transport, and is also beneficial to the use of the water-based low-temperature baking coating.
Drawings
FIG. 1 is a flow chart of the steps of the invention in one embodiment.
Detailed Description
In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the invention, whereby the invention is not limited to the specific embodiments disclosed below. In the description of the present invention, it should be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
The invention provides a water-based low-temperature baking coating, which comprises the following components in percentage by mass: 50-60% of water-based special modified polyester resin, 10-15% of water-based amino resin, 0.2-0.8% of cooling agent, 2-5% of adhesion promoter, 0.2-0.5% of leveling agent, 0.1-0.5% of defoaming agent, 2-5% of neutralizer and 20-40% of deionized water. The aqueous low-temperature baking coating is widely applied to surface coating of metal products, and because the aqueous low-temperature baking coating comprises components such as aqueous special modified polyester resin, aqueous amino resin and the like, wherein the aqueous special modified polyester resin chain contains reactive groups which are crosslinked with the aqueous amino resin, the acid resistance, flexibility, hardness and other performances of the coating can be effectively improved. The water-based low-temperature baking coating provided by the invention has excellent acid resistance, high transparency, good flexibility of a paint film, high hardness, low content of Volatile Organic Compounds (VOC) and the like through the synergistic crosslinking effect among the components such as the water-based special modified polyester resin, the water-based amino resin, the adhesion promoter and the like, and accords with the environment-friendly and environmental protection concepts.
That is, the above-described embodiment, based on 100% by weight of the aqueous low-temperature-baking coating material, comprises: 50-60% of water-based special modified polyester resin, 10-15% of water-based amino resin, 0.2-0.8% of cooling agent, 2-5% of adhesion promoter, 0.2-0.5% of leveling agent, 0.1-0.5% of defoaming agent, 2-5% of neutralizer and 20-40% of deionized water. The water-based low-temperature baking coating also has nonflammable fireproof performance, and can effectively reduce the occurrence of fire.
It is worth mentioning that the aqueous low-temperature baking coating provided by the embodiments of the invention can be widely applied to the surface treatment process of various metal products. Preferably, the aqueous low-temperature baking coating provided by the embodiments of the invention has the characteristics of better acid resistance, high hardness, high transparency, flexibility, low VOC content and the like, so that the aqueous low-temperature baking coating provided by the embodiments of the invention is suitable for decorative finishing paint of light industrial products, such as: is suitable for surface treatment of metal buttons, zippers and other hardware fittings of clothing.
In one embodiment, the aqueous specially modified polyester resin is composed of a polyol and a polyacid specially modified polymeric resin. Further, an aqueous special modified polyester resin selected from the group consisting of Changxing, model 50630-70. The water-based special modified polyester resin is obtained by special modified polymerization of polyalcohol and polybasic acid. Wherein the polyacid is selected from: one or more of isophthalic acid, phthalic anhydride, terephthalic acid, adipic acid, tetrahydrophthalic anhydride, sebacic acid, trimellitic anhydride and azelaic acid; the polyol is selected from: one or more of ethylene glycol, neopentyl glycol, propylene glycol, butanediol, hexanediol, trimethylolpropane, trimethylolethane and glycerol. The aqueous special modified polyester resin in the embodiment is a novel special modified polyester system which uses water to replace an organic solvent as a dispersion medium in use, and can effectively improve the performances of adhesion, acid resistance, workability, processability and the like of the aqueous low-temperature baking coating by matching with the aqueous amino resin and the adhesion promoter in the aqueous coating.
In one embodiment, the aqueous amino resin is a methyl etherified high imino melamine resin. As a preferred embodiment, the aqueous amino resin is selected from the group consisting of cyante 325. The aqueous amino resin provided by the embodiment can provide low-temperature reactivity and crosslinking of the aqueous low-temperature baking coating, and effectively improve the acid resistance of the aqueous coating.
In one embodiment, the temperature reducing agent is a blocked acid catalyst. As a preferred embodiment, selected from gold X49110. In the embodiment, the cooling agent is a closed acid catalyst, so that the stability of the water-based low-temperature baking coating can be ensured, the crosslinking reaction temperature of the water-based special modified polyester resin and the amino resin can be effectively reduced, the low-temperature crosslinking and curing can be realized, and various performances of a paint film can be ensured.
In one embodiment, the adhesion promoter is an aryl or alkyl phosphate. As a preferred embodiment, the adhesion promoter is selected from the group consisting of Kaolin J105A. In this example, adhesion promoters are particularly important for coated metal surfaces. Because metals are unstable, the coating of the paint typically contains micropores within the coating that are capable of penetrating oxygen, water molecules such as water, and ionic species, which accelerate the oxidation process. Corrosion due to penetration is avoided if the coating adheres well to the metal surface. The aryl or alkyl phosphate adhesion promoter is a novel adhesion promoter, has wider solubility, can improve the adhesion of a coating system, obviously improves the binding force of the coating and various base materials, and improves the moisture resistance, salt fog resistance and heat resistance of the coating. And, aryl or alkyl phosphate adhesion promoters are relatively stable in aqueous low temperature baking coating systems.
In one embodiment, the leveling agent is a siloxane, polyester or alkyl vinyl ether copolymer. As a preferred embodiment, the adhesion promoter is selected from BYK333. The leveling agent is a common coating auxiliary agent, can promote the coating to form a flat, smooth and uniform coating film in the drying and film forming process, can effectively reduce the surface tension of the coating, improve the leveling property and uniformity of the coating, improve the permeability of the coating, reduce the possibility of generating spots and marks in brushing, and increase the coverage, so that the film forming is uniform and natural. The siloxane, polyester or alkyl vinyl ether copolymer has good surface state control capability, can effectively improve the compatibility of the water-based low-temperature baking coating, reduce the surface tension and control the surface flow, and has the effects of slip enhancement, shrinkage cavity resistance and adhesion resistance.
In one embodiment, the defoamer is a silicone-based defoamer. As a preferred embodiment, the defoamer is selected from the group consisting of di-high 902W. The defoaming agent is used for inhibiting and eliminating foam, and the organic silicon defoaming agent generally comprises polydimethylsiloxane and the like, and has the advantages of high defoaming speed and good foam inhibition at normal temperature. The defoamer provided by the embodiment can effectively improve the stability of the water-based low-temperature baking coating.
In one embodiment, the neutralizing agent is N, N-dimethylethanolamine. As a preferred embodiment, the neutralizing agent is selected from the group consisting of DMEA, BASF. The neutralizing agent can make the water-based resin form polymer resin salt and dissolve in water in the paint, and has the functions of improving the water solubility of the resin in the paint, the storage stability, viscosity and curing speed of the paint and the yellowing property of the paint film. N, N-dimethylethanolamine is a high-efficiency amine neutralizer, is in a liquid state, has certain hygroscopicity, mild alkalinity and good water solubility, and has the effects of adjusting, stabilizing, assisting solvents and the like. Can effectively improve the solubilisation and stability of the water-based low-temperature baking coating, so that the coating has good water solubility, does not yellow and dries quickly.
It is worth mentioning that, as shown in fig. 1, the invention also provides a method for using the aqueous low-temperature baking coating, which comprises the following steps:
s101, obtaining a water-based low-temperature baking coating, and diluting the water-based low-temperature baking coating by deionized water to obtain a diluted water-based low-temperature baking coating;
s102, coating the diluted water-based low-temperature baking paint on the surface of the pretreated workpiece;
s103, drying the workpiece to obtain the coated workpiece.
The dry film thickness of the coated workpiece obtained by the invention is 20-25 micrometers.
According to the application method of the water-based low-temperature baking coating, the coating can be coated on the surface of the pretreated workpiece after being diluted by water, and can be dried after coating is finished, and then the coated workpiece can be obtained. The aqueous low-temperature baking coating provided by the invention has the advantages of low VOC content, reduced emission of organic solvents in the atmosphere, reduced atmospheric pollution, safe use, environmental protection and good construction property. Meanwhile, the water-based low-temperature baking coating provided by the invention has nonflammable fireproof performance, effectively reduces fire disaster, is safer to produce, store and transport, and is also beneficial to the use of the water-based low-temperature baking coating.
Specifically, in the step S101, an aqueous low-temperature baking coating is obtained, and the aqueous low-temperature baking coating is diluted with deionized water to obtain the diluted aqueous low-temperature baking coating. The method for diluting the aqueous low-temperature baking paint by deionized water comprises the following steps: the aqueous low temperature bake coating was let down with deionized water to a viscosity of field 2# cup of 18-25 seconds, 25 ℃. That is, the step of diluting the aqueous low temperature baking coating with deionized water comprises: the aqueous low-temperature baking paint is diluted by deionized water until the viscosity is that of a rock field No. 2 cup, the outflow time is 18-30 seconds, and the ambient temperature is 25 ℃. When the viscosity is lower than the viscosity, the coating is easy to sag, and the thickness of the coating is influenced; when the viscosity is higher than the viscosity, the coating construction of the paint is not facilitated, and the surface of the paint film is easy to have the problems of wrinkles, pits, orange peel and the like.
Specifically, in the step S102, a workpiece to be coated is obtained, and the workpiece to be coated is pretreated to obtain a pretreated workpiece. The pretreatment of the workpiece to be coated specifically comprises the following steps: and carrying out oil removal and dust removal treatment on the workpiece to be coated. The oil removal and dust removal treatment can be realized by cleaning and the like. The embodiment of the invention does not limit the specific oil and dust removing mode, so long as the dust and oil removing effect can be realized.
And (3) coating the dilute aqueous low-temperature baking paint on the surface of the pretreated workpiece, and drying to obtain the workpiece with the dry film thickness of 20-25 microns. Wherein, the dry film thickness is 20-25 micrometers, and when the film thickness is lower than 20 micrometers, the acid resistance is reduced; when the film thickness is more than 25 μm, the paint film at the corners of the workpiece tends to sag, and the cost is increased.
Specifically, in the above step S103, the drying method includes, but is not limited to: drying in an oven or tunnel at 110-120 deg.c for 30-40 min. The drying effect of the coated workpiece is that the crosslinking reaction of the components such as the water-based special modified polyester resin, the water-based amino resin, the adhesion promoter and the like is accelerated by drying; the other hand is to dry the paint film to form a paint film having acid resistance, hardness, transparency, and flexibility.
As a preferred embodiment, the coating means includes: spraying, knife coating, brushing, and rolling. The aqueous low-temperature baking coating prepared by the embodiment of the invention has wide use conditions and is suitable for various coating processes such as spraying, knife coating, brush coating, rolling coating and the like.
In some embodiments, the pretreatment of the workpiece to be coated specifically includes: carrying out oil removal and dust removal treatment on the workpiece to be coated; the drying method includes but is not limited to: drying in an oven or tunnel at 110-120 deg.c for 30-40 min; the manner of coating is selected from: at least one of spraying, knife coating, brush coating and rolling coating.
The application method of the water-based low-temperature baking coating solves the technical problems of poor acid resistance, glossiness, paint film flexibility, hardness and the like of the existing water-based low-temperature baking coating. So that the aqueous low-temperature baking coating is increasingly widely applied as a coating with low Volatile Organic Compound (VOC) content.
In order to further verify and explain the aqueous low-temperature baking coating and the use method of the aqueous low-temperature baking coating, a plurality of examples and a plurality of comparative examples are combined, and various performances of coated workpieces are tested and tested, so as to further explain the aqueous low-temperature baking coating and the use method of the aqueous low-temperature baking coating.
Example 1
The embodiment provides a water-based low-temperature baking coating, which is prepared by uniformly mixing the following raw materials in percentage by mass: 55% of water-based special modified polyester resin (Changxing 50630-70), 3% of neutralizer (DMEA of BASF corporation), 12% of water-based amino resin (Cyant 325), 0.5% of cooling agent (King X49110), 3% of adhesion promoter (Kai Ling J105A), 0.3% of flatting agent (BYK 333), 0.2% of defoaming agent (Digao 902W) and 26% of deionized water.
Comparative example 1
The embodiment provides a water-based low-temperature baking coating, which is prepared by uniformly mixing the following raw materials in percentage by mass: 55% of common aqueous polyester resin (Changzhou Sisai 575-4), 3% of neutralizer (BASF DMEA), 12% of aqueous amino resin (Cyate325), 0.5% of cooling agent (King X49110), 3% of adhesion promoter (Kadsura J105A), 0.3% of flatting agent (BYK 333), 0.2% of defoaming agent (Digao 902W) and 26% of deionized water.
Comparative example 2
The embodiment provides a water-based low-temperature baking coating, which is prepared by uniformly mixing the following raw materials in percentage by mass: 55% of common aqueous acrylic resin (long Saint AD-7208 SW), 3% of neutralizer (DMEA of BASF corporation), 12% of aqueous amino resin (Cyanit 325), 0.5% of cooling agent (King X49110), 3% of adhesion promoter (Kan-Ling J105A), 0.3% of leveling agent (BYK 333), 0.2% of defoaming agent (Digao 902W) and 26% of deionized water.
Comparative example 3
The comparative example used 671878 oil low temperature baking paint from Shenzhen Co. The material is prepared by uniformly mixing the following raw materials in percentage by mass: 53% of oily acrylic resin, 8% of amino resin, 3% of adhesion promoter, 0.3% of leveling agent, 16% of isopropanol, 15% of ethylene glycol monobutyl ether and 4.7% of dimethylbenzene.
Performance testing
The aqueous low temperature paints prepared in example 1, comparative example 1 and comparative example 2 of the present invention, and the oily paint of comparative example 3 were tested for properties such as transparency, hardness, adhesion, impact resistance, nitric acid resistance (30 to 33% concentration), and the like, and specific results are shown in table 1 below:
TABLE 1
As can be seen from the comparison of the performance tests, the aqueous low-temperature baking coating prepared from the aqueous special modified polyester resin in the embodiment 1 of the invention has the advantages of excellent acid resistance, high transparency and high hardness, and the performance is equivalent to that of the oily low-temperature baking coating, and the flexibility is better than that of the oily low-temperature baking coating. Comparative example 1 an aqueous low temperature bake coating prepared from a conventional aqueous polyester resin was selected for nitric acid resistance bias. Comparative example 2 aqueous low temperature bake coating prepared with common aqueous acrylic resin was selected for deviation in nitric acid resistance and impact resistance. The oily low-temperature baking coating of the comparative example 3 has deviation of impact performance, and a large amount of organic solvent is added to the aqueous low-temperature baking coating, so that the aqueous low-temperature baking coating prepared by the embodiment of the invention has the flammability opposite to that of the solvent-type oily coating, the aqueous coating is nonflammable and fireproof, the occurrence of fire is effectively reduced, and meanwhile, the aqueous low-temperature baking coating is environment-friendly and safer to produce, store and transport.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (10)
1. A water-based low-temperature baking paint is characterized in that,
comprises the following components in percentage by mass:
50-60% of water-based special modified polyester resin, 10-15% of water-based amino resin, 0.2-0.8% of cooling agent, 2-5% of adhesion promoter, 0.2-0.5% of leveling agent, 0.1-0.5% of defoaming agent, 2-5% of neutralizer and 20-40% of deionized water.
2. The aqueous low temperature baking coating of claim 1 wherein the aqueous specially modified polyester resin is obtained by specially modified polymerization of a polyol and a polyacid.
3. The aqueous low temperature baking coating of claim 1 wherein the aqueous amino resin is a methyl etherified high imino melamine resin.
4. The aqueous low temperature baking coating according to claim 1, wherein the cooling agent is a closed acid catalyst and the antifoaming agent is an organosilicon antifoaming agent.
5. The aqueous low temperature baking coating of claim 1 wherein the adhesion promoter is an aryl or alkyl phosphate.
6. The aqueous low temperature baking coating according to claim 1, wherein the leveling agent is a siloxane-based, polyester-based or alkyl vinyl ether copolymer.
7. The aqueous low temperature baking coating of claim 1 wherein the neutralizing agent is N, N-dimethylethanolamine.
8. The application method of the water-based low-temperature baking coating is characterized by comprising the following steps of:
obtaining a water-based low-temperature baking coating, diluting the water-based low-temperature baking coating by deionized water, and obtaining the diluted water-based low-temperature baking coating;
coating the diluted water-based low-temperature baking paint on the surface of the pretreated workpiece;
and drying the workpiece to obtain the coated workpiece.
9. The method of using the aqueous low temperature baking coating according to claim 1, wherein the step of diluting the aqueous low temperature baking coating with deionized water comprises:
the aqueous low-temperature baking paint is diluted by deionized water until the viscosity is that of a rock field No. 2 cup, the outflow time is 18-30 seconds, and the ambient temperature is 25 ℃.
10. The method of using the aqueous low-temperature baking paint according to claim 1, wherein the step of drying the workpiece to obtain a coated workpiece comprises:
drying in an oven or tunnel at 110-120 deg.c for 30-40 min.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211585582.5A CN116042062A (en) | 2022-12-09 | 2022-12-09 | Water-based low-temperature baking coating and application method thereof |
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| CN202211585582.5A CN116042062A (en) | 2022-12-09 | 2022-12-09 | Water-based low-temperature baking coating and application method thereof |
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| CN116042062A true CN116042062A (en) | 2023-05-02 |
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| CN202211585582.5A Pending CN116042062A (en) | 2022-12-09 | 2022-12-09 | Water-based low-temperature baking coating and application method thereof |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109679465A (en) * | 2018-12-26 | 2019-04-26 | 中华制漆（深圳）有限公司 | Water paint and its application method |
| CN110894394A (en) * | 2019-11-12 | 2020-03-20 | 无锡华东锌盾科技有限公司 | Water-based polyester amino baking varnish coating and preparation method and application thereof |
| CN114736568A (en) * | 2022-03-14 | 2022-07-12 | 中华制漆（深圳）有限公司 | Water-based nano silicon dioxide coating and use method thereof |
| CN115160905A (en) * | 2022-07-28 | 2022-10-11 | 上海佑戈金属科技有限公司 | Metal base band black precoating coating and preparation method thereof |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109679465A (en) * | 2018-12-26 | 2019-04-26 | 中华制漆（深圳）有限公司 | Water paint and its application method |
| CN110894394A (en) * | 2019-11-12 | 2020-03-20 | 无锡华东锌盾科技有限公司 | Water-based polyester amino baking varnish coating and preparation method and application thereof |
| CN114736568A (en) * | 2022-03-14 | 2022-07-12 | 中华制漆（深圳）有限公司 | Water-based nano silicon dioxide coating and use method thereof |
| CN115160905A (en) * | 2022-07-28 | 2022-10-11 | 上海佑戈金属科技有限公司 | Metal base band black precoating coating and preparation method thereof |
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