KR100639952B1 - Primer coating composition and painting method using the above primer coating composition - Google Patents

Abstract

The primer coating composition according to the present invention comprises a coating film-forming resin, a solvent, and a ceramic powder. As shown in FIG. 1, the primer coating composition according to the present invention may be applied to the surface of the subject 11. When the undercoat 12 is formed and the top coat 13 is formed thereon, the added ceramic powder protrudes to the undercoat surface in order to apply the top coat 13 to form a film having excellent adhesion. After generating fine concavities and convexities on the surface of the inorganic polymer-based coating agent, which is a top coat, chemically and physically, a high degree of binding force is formed, and after the simple degreasing treatment without sandblasting or other chemical treatment, the primer coating composition according to the present invention is formed. Topcoat made of inorganic polymer coating can be formed directly on the surface, economical, mass production, environmental It is characterized in that the problem is not caused, and when the top coat is poorly formed, the primer coating composition according to the present invention is applied to the top coat to reform the bottom coat on the top coat, the inorganic polymer coating It is possible to repaint to form a top coat repeatedly, so that all of them are manufactured as finished products by repainting without any loss of the material, and thus a very economical method is proposed by recycling resources.

Ceramic powder, primer coating, inorganic polymer coating

Description

Primer coating composition and painting method using the same {Primer coating composition and painting method using the above primer coating composition}

Figure 1 is a schematic diagram showing the configuration of the primer coating composition according to the present invention is applied to the surface of the coating and the top coat formed by applying an inorganic polymer coating on the surface of the coating.

Figure 2 is a photograph of the results of experiments of adhesion of the coating formed by the coating in the same composition and method as Example 1, except that the ceramic powder is not included in the primer coating as a comparative example.

Figure 3 is a photograph of the results of the test of the adhesion of the completed coating film formed by the coating of the inorganic polymer coating using the primer coating composition according to one specific embodiment of the present invention (Example 1).

Figure 4 is a photograph of the results of the test of the adhesion of the completed coating film formed by the coating of the inorganic polymer coating using the primer coating composition according to another specific embodiment of the present invention (Example 2).

5 is a photograph of the results of experiments on the adhesion of the finished coating film formed by the coating of the inorganic polymer coating agent using the primer coating composition according to another specific embodiment (Example 3) of the present invention.

Figure 6 shows the state before washing with alcohol for the experiment of fouling resistance of the finished coating film formed by the coating of the inorganic polymer coating using the primer coating composition according to one specific embodiment of the present invention (Example 1) It is photograph to show.

Figure 7 shows the state after washing with alcohol for the experiment of fouling resistance of the finished coating film formed by the coating of the inorganic polymer coating using the primer coating composition according to one specific embodiment of the present invention (Example 1) It is photograph to show.

* Explanation of symbols for main parts of the drawings

11: conductor 12: undercoat

13: top coat

The present invention relates to a primer coating composition comprising a ceramic powder and a coating method using the same. More specifically, the present invention relates to a primer coating composition and a coating method using the same, comprising a ceramic powder having a porous or large specific surface area for coating the inorganic polymer coating.

Inorganic polymer coating materials (inorganic coating compositions starting from metal alkoxides, metal salts, etc.) are widely used in various industrial fields because of their excellent mechanical, physical, thermal, chemical, electrical, and optical properties. Functional coatings are expected to increase demand.

In the case of metal alkoxides, alkoxide-type compounds such as silicon, titanium, aluminum, and zirconium undergo hydrolysis and polycondensation reactions to form inorganic polymer networks, and in the case of metal salts, reactions are induced using an appropriate catalyst. By doing so, an excellent inorganic coating film can be obtained.

In addition to the above-mentioned uses manufactured and used in this manner, demand is increasing at a very rapid rate in various fields such as construction materials, electric and electronic devices, and kitchen appliances.

However, in general, the inorganic polymer-based coating agent has a limitation in use because the method of pretreatment of the coating material is very limited, and this problem has been an obstacle to wide application in the market.

For example, in the case of metal products, in order to improve adhesion to the object, a mechanical method of sand blasting has to be applied, which is to increase the cost of coating, induce air pollution, and mass production. There is a problem such as difficulty in the application of, and in the case of chromate treatment, which is a chemical method, there is a problem of environmental pollution due to chromium, which is a heavy metal, and it is only limited to products having a small size of the workpiece. Moreover, the above-mentioned sandblasting and chromate treatment are all avoided as a work method having a degree of danger that may threaten worker's health.

In the case of glass products, the surface of the product was etched using chemicals (fluoric acid) in order to increase the adhesive strength, and coating was possible, and this also prevented secondary pollution by using an etching solution such as hydrofluoric acid. There was a problem causing.

In addition, in the case of plastic products, it is known that the application of the inorganic polymer coating agent is impossible because the adhesion is not made.

On the other hand, in terms of resource recycling, if a defect occurs after the inorganic polymer coating is applied (such as poor coating or poor color), there is a problem that sandblasting treatment must be performed to peel off the coating film, and such reprocessing also increases costs. , Air pollution, and difficulty in mass production. Therefore, it is recognized as an uneconomical method because the above problems are almost impossible to recycle, so the direct and indirect losses are very large.

Therefore, in view of the problems in the prior art, (1) without coating the sandblasting, chromate treatment, or chemical pretreatment, coating the inorganic polymer-based coating directly on the surface of the object such as metal or ceramic to form a top coat It is difficult to do it, and even if the top coat is formed, the bonding strength is very weak, so that there is a problem of easily falling off due to partial damage of the top coat. (2) Even if the top coat is formed by coating the inorganic polymer coating, etc. In case of occurrence, it is impossible to form the coating by coating the inorganic polymer coating without removing it by sandblasting, chromate treatment, or pretreatment with chemicals as described above. Blasting or chromate treatment or chemicals When the pre-processing by a problem of environmental pollution is caused, and (4) rise and 5 of the production cost due to the pre-treatment, there were also difficult is the problem being that caused the problem, such as in mass production.

An object of the present invention is to provide a primer coating composition and a coating method using the same, which comprises a ceramic powder having a porous or large specific surface area for coating the inorganic polymer coating.

Primer coating composition according to the present invention, in the primer coating composition comprising 50 to 90% by weight of the coating film-forming resin and the remaining amount of the solvent, 20 to 80 of the coating film thickness of the under coat which can be formed by the primer coating composition The ceramic powder having an average particle size corresponding to% is further included in an amount of 1 to 10% by weight based on the total weight of the primer coating composition.

The ceramic powder can be used selected from the group consisting of silica, alumina, zirconia, titania or powders of ceramic materials comprising any one or two or more thereof.

The ceramic powder may be a powder having a large specific surface area or porous.

In addition, the coating method using the primer coating composition according to the present invention, by coating the primer to form a coat, and coating the top coat thereon, (1) by washing the surface of the subject to degrease, or a variety of known Pretreating the surface of the subject by a pretreatment method; (2) 50 to 90% by weight of the coating film-forming resin and the remaining amount on the surface of the degreased object to be formed by further comprising a ceramic powder in the primer coating composition comprising a solvent, which is formed by the primer coating composition It is possible to apply a primer coating composition comprising a ceramic powder having an average particle size corresponding to 20 to 80% of the coating film thickness of the coating layer in an amount of 1 to 10% by weight based on the total weight of the primer coating composition. A channel forming step for forming a; (3) a top coat forming step of forming a top coat by applying a common inorganic polymer-based coating agent on the bottom coat formed in the bottom coat forming step; And (4) repainting the primer coating composition used in the undercoating step of (2) again without any pretreatment on the already formed top coat when the top coat formed in the top coat forming step has a poor coating. Forming and re-coating a conventional inorganic polymer-based coating agent used in the phase forming step of (3) thereon to form the coating again.

The re-coating repetition step of repeating the re-coating step of (4) at least two to three times until the top coat obtained in the re-coating step of (4) does not occur may be further included.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

Primer coating composition according to the present invention, in the primer coating composition comprising 50 to 90% by weight of the coating film-forming resin and the remaining amount of the solvent, 20 to 80 of the coating film thickness of the under coat which can be formed by the primer coating composition The ceramic powder having an average particle size corresponding to% is characterized in that it further comprises in an amount of 1 to 10% by weight based on the total weight of the primer coating composition.

That is, as shown in Figure 1, when the primer coating composition according to the present invention is applied to the surface of the subject 11, the undercoat 12 is formed, and when the top coat 13 is formed thereon, the top coat 13 ) Is applied with high adhesion to form a film, the added ceramic powder protrudes on the surface of the undercoat, and generates fine concavities and convexities on the surface of the undercoat to generate a chemical and physically high bonding force with the inorganic polymeric coating agent, which is a top coat. It is applied as a primer of the inorganic polymer coating agent by exerting excellent adhesive force, and also re-coating the inorganic polymer coating agent, which is a coating material, by forming a coat by reapplying the primer coating composition according to the present invention when the top coat is poorly formed. This may be repeated at least 2-3 times.

That is, when the primer coating composition containing the ceramic powder is applied to the surface of the subject according to the present invention, a part of the ceramic powder particles protrudes from the coating layer surface of the undercoat, and fine irregularities are formed on the surface of the dry coating layer. Since the added ceramic powder particles have the same or similar structure, composition, and physical properties as those formed by the inorganic polymer coating agent, the ceramic powder particles have high bonding strength with the inorganic polymer coating agent unlike the organic binder resin in the conventional primer composition. Indicates. Therefore, the ceramic powder particles protruding from the surface of the coating film of the primer coating composition are chemically bonded to the coating material with high bonding strength, thereby greatly improving the adhesion. In addition, the fine irregularities formed in the coating film of the primer coating composition widens the adhesion area and improves the physical bonding strength due to the shape to generate the physical adhesion between the primer and the coating material. The primer composition to which the ceramic powder is added by the high bonding strength with the inorganic polymer-based coating material thus produced exhibits the properties of the high quality coating material.

The particle size of the ceramic powder is 20 to 80%, more preferably 30 to 50% of the dry coating thickness of the primer coating composition. If the particle size is less than 20% of the dry coating thickness, the surface irregularities generation effect is reduced, the excessive amount is added to expose the particles there may be a problem that the physical properties such as the strength of the primer, adhesive strength decreases. On the contrary, when the particle size is 80% or more of the thickness of the dry coating film, irregularities of the surface are severely generated, causing problems such as poor appearance of the finished topcoat material.

The addition amount of the ceramic powder particles varies greatly depending on the properties of the ceramic powder and the type of the organic binder resin described below, and may be 1 to 10% by weight, more preferably 2 to 4% by weight. If the amount is less than 1% by weight, there may be a problem in that the adhesion is less due to the occurrence of irregularities and protrusions, if the addition amount is more than 10% by weight, the appearance of the top coat is likely to occur due to severe irregularities, primer composition There may be a problem such as poor physical properties, such as hardness, adhesion. However, since the addition amount is greatly affected by the properties of the ceramic powder particles, it is not limited thereto.

The ceramic powder may be selected from the group consisting of silica, alumina, zirconia, titania or powders of ceramic materials including any one or two or more thereof. These ceramic powders may preferably be the same as or similar to the composition of the inorganic polymeric coating used for coating. This not only increases the physical bonding strength by providing the unevenness by exposing the ceramic powder to the undercoat, but also chemically bonds with the conventional inorganic polymer-based coating agent as a coating material at a high bonding force, thereby greatly improving the adhesive force. The inorganic polymer coating agent is a starting material of metal alkoxide, metal salt, and the like. In the case of metal alkoxide, alkoxide-type compounds such as silicon, titanium, aluminum and zirconium are hydrolyzed and polycondensed to form an inorganic polymer network. In the case of a metal salt, an excellent inorganic coating film can be obtained by inducing a reaction using an appropriate catalyst. In the coating process of the inorganic polymer coating agent, a general coating process is applied as it is depending on the type of organic binder used.

The ceramic powder may be a powder having a large specific surface area or porous.

These ceramic powders are fixed in the lower road and serve to form a high bond strength physically and chemically with the top when the top is painted.

Resin for forming a coating film in the primer composition refers to a resin that is applied to existing organic and inorganic materials, for example, acrylic resin, enamel resin, urethane resin, epoxy resin, silicone resin, fluorine resin or two or more of them. It may be selected from the group consisting of mixtures and is not particularly limited.

The solvent in the primer composition can be naturally understood by those skilled in the art that it is possible to dissolve the resin forming the primer for forming the coating film, in particular, and to volatilize and leave the film after application. The solvent may be one that can dissolve organic matters well such as toluene, ketones, etc., and can be easily volatilized and removed after application. In addition, it can be understood that other well-known solvents may also be used in addition to the toluene or ketones described above. Furthermore, a suitable mixture of various solvents may be mainly used rather than a single solvent. For example, when the fluororesin is used as the primer coating film-forming resin, a solvent composed of a mixture of toluene and methyl ethyl ketone is used, and when an epoxy resin is used, a solvent composed of a mixture of toluene and methyl isobutyl ketone is used. Can be.

In addition, the primer coating composition according to the present invention may further include a commercialized pigment, filler, additives and the like. Pigments and fillers are not particularly limited as being added to common paints, and may not be added if they are transparent. Solvents and additives are also not particularly limited as being added to general paints. These may all be the same or similar to those used in conventional primer compositions used for conventional paints or other coatings, and these may be understood to be well known to those skilled in the art to be commercially available and appropriately used. There are things.

The coating process of the primer composition may be applied to the general coating process as it is depending on the type of the subject and the organic binder used.

In addition, the coating method using the primer coating composition according to the present invention, by coating the primer to form a coat, and coating the top coat thereon, (1) by washing the surface of the subject to degrease, or a variety of known Pretreating the surface of the subject by a pretreatment method; (2) 50 to 90% by weight of the coating film-forming resin and the remaining amount on the surface of the degreased object to be formed by further comprising a ceramic powder in the primer coating composition comprising a solvent, which is formed by the primer coating composition It is possible to apply a primer coating composition comprising a ceramic powder having an average particle size corresponding to 20 to 80% of the coating film thickness of the coating layer in an amount of 1 to 10% by weight based on the total weight of the primer coating composition. A channel forming step for forming a; (3) a top coat forming step of forming a top coat by applying a common inorganic polymer-based coating agent on the bottom coat formed in the bottom coat forming step; And (4) repainting the primer coating composition used in the undercoating step of (2) again without any pretreatment on the already formed top coat when the top coat formed in the top coat forming step has a poor coating. And repainting to form a top coat by recoating a conventional inorganic polymer-based coating agent used in the top coat forming step (3) thereon. That is, the coating method using the primer coating composition according to the present invention, after degreasing the subject using a primer coating composition according to the present invention without a separate pretreatment, after coating and drying under the coating, a conventional inorganic polymer coating agent thereon Even if the coating is formed to form a top coat, the top coat is tightly coupled to the surface of the subject with high bonding force, and even when the top coat is deteriorated due to poor coating, the present invention is again formed on the top coat already formed without a separate pretreatment. The primer coating composition according to the present invention is used to form a top coat as it is, and to coat a normal inorganic polymer coating agent on the top thereof to form a top coat so as to cure the coating defect of the top coat. Including repainting steps characterized by Characterized in, and this coating material is made possible by using the primer coating composition of the aforementioned bar in accordance with the present invention. Moreover, this repainting can be repeated at least two or three times more, so that the coating can be applied without any pretreatment until the desired quality of coating is repeatedly obtained without loss of raw materials. You can complete it.

The following examples are intended to illustrate the invention and should not be understood as limiting the scope of the invention.

Comparative example

The aluminum plate was degreased with a trichloroethylene solvent using a subject, and then 20 g of a mixture of toluene and methyl ethyl ketone were added to 80 g of fluorine resin to prepare a conventional primer, which was then dried using an air spray gun. It was applied at 占 퐉 and baked for 20 minutes at a temperature of 215 占 폚 (± 5 占 폚). Subsequently, preheat the primer to about 40 ℃, apply inorganic polymer-based coating agent (Product Name; Nanocoat, Cerachem, Korea) with air spray gun at 30㎛ dry film thickness and quench at 140 ℃ for 20 minutes to complete the coating. It was.

In order to test the adhesion of the finished coating film, 11 parallel lines perpendicular to the test piece are drawn at intervals of 1 mm, and a checkered line is drawn to have 100 square scales within 1 cm ² . When making such a line, the front end of the cutting knife is kept at a predetermined angle in the range of 35 to 45 ° with respect to the painted surface, and is drawn at the same speed of about 0.5 seconds per division so that the absorption by the knife touches the surface to be coated. Place the tape on the center of the lattice shape in the direction parallel to the cut part with the adhesive tape on it, and stick the tape so that the length of the non-stick tape is 20 mm. Rub the tape strongly with your fingernail to maintain good adhesion with the coating. 5 minutes after the tape was put on, the tape was pulled and peeled off at an angle of 60 "between 0.5 and 1.0 seconds (KS M 5981-1).

As a result of the test, as shown in Figure 2, there was almost no adhesion between the primer and the inorganic polymer top coat by the primer was confirmed that all of the inorganic polymer top coat material is peeling off. This is a good example showing that the primer coating material without addition of ceramic powder has little bonding force with the inorganic polymer-based top coating material.

Example 1

The primer coating composition according to the present invention was prepared by mixing 10 g of the solvent and 3 g of the ceramic powder having an average particle diameter of 10.8 μm with 87 g of the fluorine resin used in the comparative example, and using the same, the same procedure as in the comparative example was performed. 3 is shown.

As shown in FIG. 3, excellent adhesion between the primer coating composition and the inorganic polymer-based coating material was exerted and no peeling phenomenon occurred. This is a good example showing that when the ceramic powder is added according to the present invention to a conventional primer having almost no top coat and adhesive strength formed by the inorganic polymer coating agent, the top coat formed by the inorganic polymer coating material generates excellent adhesion.

Example 2

3 g of the ceramic powder used in Example 1 and 20 g of a mixture of toluene and methyl isobutyl ketone as a solvent were mixed with 77 g of an epoxy resin to prepare a primer coating composition according to the present invention, and then used in the same manner as in Comparative Example. The piece was produced and the result of having carried out an adhesion experiment is shown in FIG.

As a result of the test, as shown in Figure 4, the excellent adhesion between the primer coating composition and the inorganic polymer-based top coating material is exhibited no peeling phenomenon occurs.

This is a good example showing that the addition of ceramic powder shows excellent adhesion with the inorganic polymer-based coating material regardless of the type of organic resin in the primer coating composition.

Example 3

3 g of ceramic powder used in Example 1 and 20 g of a mixture of toluene and methyl isobutyl ketone as a solvent were mixed with 77 g of an epoxy resin to prepare a primer coating composition according to the present invention, and then coated on the surface of the adherend to obtain After forming, apply the inorganic polymer-based coating agent in the same manner as in the comparative example to form a top coat, and then to form a coat again in the same way and then to form a coat again on the same method two times The coating was carried out, and the adhesion test was performed under the same conditions to observe the degree of detachment of the coating film, and the results are shown in the photograph in FIG. 5.

As shown in Figure 4, in the second embodiment according to the present invention, as in the first embodiment, the coating film of the part where the actual blade touched is scraped off by physical force to form a groove by the blade, but these The coatings between the grooves could be confirmed to remain in close contact with each other. Therefore, it could be confirmed that similar results can be obtained by changing the coating film forming resin in the primer coating composition for forming the undercoat. On the other hand, even when the primer composition according to the present invention is repeatedly applied twice, as shown in Figure 5, the surface of the subject is sufficient enough to be very resistant to physical external force so that it cannot be observed with the naked eye. It was confirmed that the coating degree indicated could be obtained.

In addition, graffiti with a commercially available oil-based magic for the test of contamination on the top coat obtained in Example 1 (picture of Figure 6), when washed with ethanol, as shown in the picture of Figure 7 The commercially available inorganic polymer-based coating agent was coated very uniformly to form a smooth top surface, which showed very good stain resistance.

Therefore, according to the present invention, there is an effect of providing a primer coating composition and a coating method using the same, which comprises a ceramic powder having a porous or large specific surface area for coating the inorganic polymer coating. In the case of using the primer coating composition according to the present invention, the added ceramic powder protrudes on the surface of the undercoat, and generates fine concavities and convexities on the surface of the undercoat. It is applied as a primer of an inorganic polymer coating agent. Therefore, to solve the conventional problems as mentioned above, (1) coating the inorganic polymer-based coating agent directly on the surface of the metal, ceramic, or the like, without sandblasting, chromate treatment or chemical pretreatment to improve the top coat It can be formed, and the top coat at this time can be attached to the surface of the subject with a high binding force, (2) even if the coating is formed even after coating the inorganic polymer-based coating agent, if the coating defects, etc. again, the same By coating the inorganic polymer-based coating agent using the primer coating composition according to the present invention without sandblasting or chromate treatment or pretreatment with chemicals as described above to form a coat on the top coat formed, and the inorganic polymer-based coating agent thereon A material that can be coated to form a top coat It is possible to minimize the occurrence of defective products due to defects in the top coat, and (3) eliminates the problem of environmental pollution caused by these pretreatment because no pretreatment by sand blasting, chromate treatment or chemicals is necessary. It is possible to eliminate the problem of (4) increase in production cost by pretreatment, and (5) to be repainted without pretreatment, thereby enabling mass production.                     

Although the present invention has been described in detail only with respect to the described embodiments, it will be apparent to those skilled in the art that various modifications and variations are possible within the technical scope of the present invention, and such modifications and modifications are within the scope of the appended claims.

Claims (5)

delete In the primer coating composition comprising 50 to 90% by weight of the resin for forming a film and a solvent as the remaining amount, which is used under the inorganic polymer-based coating, Further comprising ceramic powder having an average particle size corresponding to 20 to 80% of the undercoat dry film thickness that can be formed by the primer coating composition in an amount of 1 to 10% by weight relative to the total weight of the primer coating composition. Wherein the ceramic powder is selected from the group consisting of silica, alumina, zirconia, titania or powders of ceramic materials comprising any one or two or more thereof. The method of claim 2, Primer coating composition, characterized in that the ceramic powder is a powder having a large specific surface area or porous. In applying a primer to form a coat and coating the coat on it, (1) pretreatment of the surface of the subject by washing or degreasing the surface of the subject, or by various known pretreatment methods. (2) 50 to 90% by weight of the coating film-forming resin and the remaining amount on the surface of the degreased object to be formed by further comprising a ceramic powder in the primer coating composition comprising a solvent, which is formed by the primer coating composition A group having an average particle size corresponding to 20 to 80% of the coating thickness of the undercoat, wherein the ceramic powder is composed of silica, alumina, zirconia, titania, or powders of ceramic materials containing any one or two or more thereof. A primer coating step of forming a coat by applying the primer coating composition further comprising an amount of ceramic powder selected from 1 to 10% by weight based on the total weight of the primer coating composition; (3) a top coat forming step of forming a top coat by applying a common inorganic polymer coating agent on the bottom coat formed in the bottom coat forming step, (4) repainting the primer coating composition used in the step forming step of (2) again without a separate pretreatment on the already formed top coat when the coat formed in the coat forming step has a poor coating, etc. And a recoating step of re-coating a conventional inorganic polymer coating agent used in the phase forming step of (3) above to form the top coat again. The method of claim 4, wherein Primer, characterized in that further comprising a re-coating repeating step of repeating the re-coating step of (4) at least two to three times until the top coat obtained in the re-coating step of (4) does not occur Coating method using a coating composition.

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