CN117624979A - An oily paint composition and its application - Google Patents

Abstract

The invention belongs to the field of coating technology, and relates to an oily paint composition and its application. Specifically, the composition can be used to eliminate or improve color spots, and is especially suitable for intermediate coating after the implementation of the 3C2B process. The problem of color difference occurs when spraying oily aluminum powder paint on a defective location. The oily paint composition at least includes aluminum powder and ethylene-vinyl acetate copolymer wax (EVA wax), wherein the content of the EVA wax is 80%-150% based on the weight of the aluminum powder. The oil-based paint composition provided by the invention can solve the problem caused by sandpaper polishing spots after oil-based pure aluminum powder is baked; it reduces process steps, reduces paint consumption, and improves production efficiency.

Description

An oily paint composition and its application

Technical field

The invention belongs to the field of coating technology and relates to an oily paint composition and its application. Specifically, the composition can be used to eliminate or improve color difference spots, and is especially suitable for mid-coat after the implementation of the 3C2B process. The problem of color difference spots occurs when spraying oily aluminum powder paint on the defective parts of the operation.

The oily paint composition at least includes aluminum powder and ethylene-vinyl acetate copolymer wax (EVA wax), wherein the content of the EVA wax is 80%-150% based on the weight of the aluminum powder. The oil-based paint composition provided by the invention can solve the problem caused by sandpaper polishing spots after oil-based pure aluminum powder is baked; it reduces process steps, reduces paint consumption, and improves production efficiency.

Background technique

In the prior art, the solution to improve the sandpaper scratches is to fill the sandpaper scratches by adding fillers in the paint; however, this solution cannot improve the sandpaper scratches. The solution to improve the sandpaper spots requires re-spraying the intermediate coating on the sanded area. However, if the repair is incomplete, the sandpaper spots cannot be completely treated. These methods of eliminating or improving polishing marks or spots in the prior art also have the problems of increasing processing steps, increasing paint consumption, longer working hours, and incomplete treatment of sanding spots.

Contents of the invention

One object of the present invention is to provide an oily paint composition for eliminating or improving color difference spots, which is especially suitable for spraying oily aluminum powder paint to the defective position of the middle coating operation after the implementation of the 3C2B process. The problem of chromatic aberrations. The oily paint composition at least includes aluminum powder and an orientation agent, wherein the orientation agent is ethylene-vinyl acetate copolymer wax (EVA wax), and the content of the EVA wax is 80%-150% based on the weight of the aluminum powder.

Further, in the oily paint composition, the aluminum powder can be one or more aluminum powders of different grades.

Further, the oily paint composition also includes acrylic resin, amino resin, solvent, wax, microgel and dust-proof agent.

The oil paint composition also includes one or more auxiliaries, such as dispersants, leveling agents or tackifiers.

Another object of the present invention is to provide a paint film obtained by spraying the oily paint composition. The thickness of the paint film is only 10-14 μm, the color is uniform, and the hiding power is excellent. The paint film has a uniform color. The oil-based paint composition is sprayed on the normal primer layer including sanding spots or marks and other non-sanding by conventional methods, thereby obtaining a paint film with improved hiding power, which has uniform color, consistent color, and no color difference.

The oil-based paint composition of the present invention is simple and convenient to construct, has no specific requirements on the sanding time, depth, size, etc. of the bottom layer, and also has excellent water resistance. Moreover, the coating composition maintains its good rheology, is suitable for recoating processes, and has greater tolerance for construction temperature, humidity and other environments. It improves the protective performance of the substrate while ensuring the appearance. Among them, the orienting agent EVA wax promotes the directional arrangement of aluminum powder and enhances the hiding power of its paint film. The coating prepared by spraying the above-mentioned oily paint coating composition can be widely used in exterior coating applications of industrial and home decoration products.

Description of drawings

Figure 1 shows the repairing effect of the paint composition of Example 1 and Comparative Example 1 of the present invention on sanding marks or spots respectively.

Detailed ways

Specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, it should be understood that the present invention is not limited to the embodiments described below, and the inventive concepts and technical solutions of the present invention can be implemented in combination with other technical features or solutions limited in the art. The technical solutions of the present invention will be described below with reference to specific examples. If there is no specific description, various raw materials of the present invention can be commercially available or prepared according to conventional methods in the art. Unless otherwise specified, all professional and scientific terms used in the present invention have the same meanings familiar to those skilled in the art. Any method or material similar to that described can be used in the method of the present invention.

Each aspect or embodiment defined in the description of the present specification may be combined with any other aspect or aspects or embodiment or embodiments. In particular, any feature stated as being preferred or advantageous may be combined with any other feature stated as being preferred or advantageous.

The word "plurality" means two or more, unless expressly limited otherwise. The term "oil-based paint composition" may refer to existing oil-based paints of different colors. The term "oil-based aluminum paint" refers to aluminum paints that do not contain colorants or pigments and are characterized by poor hiding power at the thickness of a standard applied paint film. Specifically, if the content of aluminum powder is low, or the thickness of the film is small, or the aluminum powder topcoat has insufficient covering power, there may be problems with polishing marks; in addition, too high an amount of aluminum powder added will affect the appearance of the paint film.

The oily paint film composition provided by the invention adds EVA wax to make the aluminum powder more evenly arranged, increases the hiding power of the paint, and thereby improves sandpaper polishing spots. In addition, when sandpaper sanding spots are caused by poor covering power or poor construction covering power, the composition can also improve the arrangement of aluminum powder, thereby improving the zebra pattern problem that occurs.

Specifically, embodiments of the present invention provide an oily paint composition for eliminating or improving color difference spots, and is particularly suitable for spraying oily aluminum powder paint to locations where there are defects in the middle coating operation after the middle coating of the 3C2B process is implemented. The problem of chromatic aberration appears later. The oily paint composition at least includes aluminum powder and an orientation agent, wherein the orientation agent is ethylene-vinyl acetate copolymer wax (EVA wax), and the content of the EVA wax is 80%-150% based on the weight of the aluminum powder.

Further, the oily paint composition also includes acrylic resin, amino resin, solvent, wax, microgel and dust-proof agent. The oil paint composition also includes one or more auxiliaries, such as dispersants, leveling agents or tackifiers. The aluminum powder can be one or more different grades of aluminum powder.

Embodiments of the present invention also provide a paint film obtained by spraying the oily paint composition, the thickness of the paint film is only 10-14 μm, the color is uniform, and the hiding power is excellent. Specifically, the oil-based paint composition is sprayed on the normal primer layer including sanding spots or marks and other non-sanding by conventional methods, thereby obtaining a paint film with improved hiding power, which has a uniform color and a consistent color. No color difference.

In one or more of the following embodiments, the paint composition of the embodiment of the present invention is prepared using the following materials using a conventional preparation process. Its composition and content are as shown in Table 1 below.

Material

Aluminum powder 1: Toyo TZ-562J or TZ-930647J

Aluminum powder 2: ALUMINUM PASTE LX-7900A

Microgel: Nippon Paint AZS-522-30

n-butyl etherified amino resin: Changchun Chemical, BR 20SE

Acrylic resin 1: Nippon Paint, ACR-421

Acrylic resin 1: Mitsubishi Rayon polymer material, DIAL HR-7030

Polyethylene wax: DISPARLON, DISPARLON 4200-10

Polyamide wax: DISPARLON, DISPARLON 6901-20X

Leveling agent 1: Nippon Paint, LEVELER S (EX)

Leveling agent 2: AFCONA3777

Wetting and dispersing agents: -DISPERSANT-161

Barium sulfate: Sakai Chemical, BF-40

EVA wax: Hemmings, DeuRheo 556S

Conductive additive: BYK-ES 80

Example 1: Oily paint composition 1

The oily paint composition includes aluminum powder, acrylic resin, amino resin, solvent, wax, microgel and dustproof agent, and also includes one or more auxiliaries, such as aluminum powder auxiliary, dispersant, leveling agent agent or tackifier, etc. The components and contents are shown in Table 1.

Example 2: Oily paint composition 2

Example 2 has the same composition as Example 1, except that the aluminum powder content of different specifications is different, and the EVA wax content is different.

Comparative example 1

The same composition as in Example 1 was used, except that the content of EVA wax was reduced to 4.8%.

Comparative Example 2-3

The same basic oil paint components as in Example 1-2 were used, except that CAB381-20 was used in this comparative example instead of EVA wax, and the aluminum powder content of the two different specifications was different from that in Example 1-2.

Table 1. Composition of oily coating compositions of Examples 1-2 and Comparative Examples 1-3

Example 3

The oil-based paint composition is sprayed on the normal primer layer including sanding spots or marks and other non-sanding by conventional methods, thereby obtaining a paint film with improved hiding power, which has uniform color, consistent color, and no color difference.

The specific construction steps and conditions are as follows:

1. Substrate selection, choose ED electrophoresis plate or tinplate plate as the substrate.

2. Surface treatment, for example, use a solvent to degrease the surface. The solvent is a mixture of ethanol and toluene, where ethanol:toluene=1:1.

3. Coating method, adopt conventional 3C/2B process.

4. Control the thickness of the paint film by controlling the flow rate of the paint composition flowing through the nozzle.

ORGA 500 gray (Nippon Paint, China) was used for intermediate coating. After drying, the film thickness formed by the intermediate coating is 30-40μm;

Use the oily paint compositions of the examples and comparative examples and spray them to form a paint film with a thickness within 11-13 μm;

Next, use MAC O-1880 varnish (Nippon Paint, China) to apply varnish; dry it to form a varnish thickness of 30-40 μm.

5. Select diluent

Use ORGA 500 gray paint, spray, dry, and then use N-178/N-197 (Nippon Paint, China) for intermediate coating; the diluent used in the examples and comparative examples is N-283/N-285 ( Nippon Paint, China).

Among them, MAC O-1880 varnish:EEP:S-100# is 1:1.

6.Painting viscosity

Dry the ORGA 500 gray paint, apply it as a middle coat, and use N-178/N-197 thinner to dilute the viscosity to 20°C Ford 4# cup for 22-24 seconds;

Examples and Comparative Examples, the operation is the same as above, dilute the viscosity to 20°C Ford 4# cup for 13-14 seconds;

For MAC O-1880 varnish, the operation is the same as above, and the viscosity is diluted to between 27-28s at 20°C Ford 4# cup.

7. Spraying conditions

Intermediate coating, leveling for 6 minutes and 30 seconds; baking, 20 minutes at 140°C;

Color paint 1-color paint 2, flash drying 1min35s, leveling 8min45s;

Varnish, level for 6 minutes and 30 seconds; bake at 140°C for 20 minutes.

The above-mentioned control of the thickness of the film will also affect the sandpaper marks and polishing spots. A thicker film will have better sandpaper marks or sanding spots, and a thinner film will have worse sandpaper marks and sanding spots. However, too thick a film will affect the color, appearance and performance. . If it is too thin, it will affect the color and luster of the polished and non-polished areas. As shown in Table 2-4 below, the surface and facade parameters of different film thicknesses are shown in Table 2-4 below.

Table 2

table 3

11-13 microns L a b 15° 112.21 -0.40 -0.10 25° 96.88 -0.65 -0.36 45° 69.47 -0.56 -1.01 75° 50.12 -0.80 -1.74 110° 43.20 -0.97 -2.11

Table 4

14-16 micron L a b 15° 106.77 -0.41 -0.06 25° 92.4 -0.67 -0.21 45° 67.98 -0.58 -1.05 75° 51.33 -0.82 -2.01 110° 45.07 -0.99 -2.45

It can be seen from the above that the thicker the film, the worse the appearance, and the colors are different depending on the film thickness.

Test example 1

The performance of the oily paint compositions of Examples and Comparative Example 1 after spraying was tested. The spraying operating parameters are listed in Table 5 below. After testing, the sandpaper polishing spots in the example were well covered and passed the test; while the sandpaper marks and sanding spots in the comparative example were obvious, which was unqualified. Table 5 below provides the realization of grinding marks.

Table 5. Spraying operating parameters

Test example 2

A paint film is obtained after spraying. Tested for impact, cupping, adhesion and water resistance. The test results are listed in Table 6.

Table 6. Performance parameters of the paint film formed by spraying the oily paint film composition 1 of Example 1

After the above test procedures, the surface condition of the paint film of the sample of Example 1 is as shown in the attached figure. It has good flatness, good hiding ability, uniform color, and no obvious polishing spots or marks can be seen with the naked eye. Moreover, compared with the picture without sanding spots, the apparent difference of the paint film is not significant.

The above embodiments and test examples show that compared with the existing technology, the oily paint composition provided by the above technical solution of the present invention is suitable for the 3C2B process. After spraying the oil-based paint composition, in the process of controlling the film thickness and at a moderate thickness, sandpaper polishing marks or spots are significantly eliminated or improved, and the metallic effect and reflective effect are also greatly improved. Moreover, its construction temperature and humidity conditions are not harsh and its tolerance is large. Through laboratory simulation, under the environmental conditions of ambient temperature 20-26°C and relative humidity 55-75%, it can not only ensure a high paint film thickness, but also obtain good flatness.

The above are only preferred specific embodiments of the present invention, and are only used to illustrate the technical solutions of the present invention, but are not used to limit the present invention. Any technical solutions obtained by equivalent substitutions, modifications or combinations made by those skilled in the art in accordance with the concept and spirit of the present invention shall be deemed to fall within the protection scope of the present invention.

Claims (5)

1. An oily paint composition for eliminating or improving color difference spots, characterized in that the oily paint composition includes aluminum powder and ethylene-vinyl acetate copolymer EVA wax, wherein the content of the EVA wax is 80%-150% based on aluminum powder weight. 2. The oily paint composition according to claim 1, characterized in that the oily paint composition further includes acrylic resin, amino resin, solvent, wax, microgel and dustproof agent. 3. The oily paint composition according to claim 1, characterized in that the oily paint composition further includes a dispersant, a leveling agent or a tackifier. 4. The oily paint composition according to claim 1, wherein the content of the EVA wax in the oily paint composition is 80%-100% based on the weight of the aluminum powder. 5. A paint film obtained by spraying the oily paint composition to eliminate or improve color spots, characterized in that the thickness of the paint film is 10-14 μm, the color is uniform, and the hiding power is excellent.