Spraying method for improving pollution resistance of H61-1 silver powder paint

Abstract

The invention belongs to the field of paint spraying process design, and particularly relates to a spraying method for improving pollution resistance of H61-1 silver powder paint. After an H61-1 paint film is dried, when an operator touches the paint film with a bare hand, the paint film is easily discolored and blackened. When the aluminum powder is wiped by gasoline and alcohol organic solvents or purified water inorganic solvents, the aluminum powder is locally oxidized to cause floating phenomenon. The paint with different component proportions is sprayed twice, the viscosity, the time interval and the subsequent drying mode of the paint sprayed twice are controlled, a paint film obtained after H61-1 spraying meets the original physical and chemical properties such as high temperature resistance and corrosion resistance, and the surface of the paint film has high pollution resistance.

Description

Technical Field

[0001] The present invention belongs to the field of paint spraying process design, and specifically relates to a spraying method for improving the anti-pollution property of H61-1 silver powder paint, so that the paint film after H61-1 spraying meets the original physical and chemical properties such as high temperature resistance and corrosion resistance, and the paint film surface has high anti-pollution property. Background Art

[0002] H61-1 aviation epoxy silicone heat-resistant paint, due to its inclusion of aluminum powder and silicone elements, offers high-temperature resistance. Because the aluminum powder imparts a silvery appearance to the paint film after spraying, it is often referred to as silver paint. H61-1 silver paint is a three-component paint: epoxy silicone resin (component 1), polyamide resin (component 2), and aluminum powder (component 3), with the weight ratio of these three components being 100:30:20. During the drying process, the silver powder, due to surface tension, migrates to the paint film surface, causing aluminum powder to accumulate. In practice, after the sprayed paint film has dried, touching it with bare hands will leave fingerprints and appear black. Wiping with gasoline, alcohol, or purified water will also cause the paint film to become smudged.

[0003] After the H61-1 paint film dries, aluminum powder and silicone accumulate on the outer surface. Because the aluminum powder particles used are 40µm, the film thickness is generally 40µm to 60µm. Sometimes the original resin cannot fully encapsulate the aluminum powder. When an operator touches the paint film with bare hands, the acidic lactic acid in hand sweat causes the aluminum powder on the outer surface to discolor and darken. Wiping with organic solvents like gasoline and alcohol, or inorganic solvents like purified water, can cause partial oxidation of the aluminum powder, resulting in a blooming phenomenon.

[0004] To address the poor contamination resistance of silver powder paint, the current practice is to require operators to wear clean white gloves to inspect and recycle the H61-1 paint film after it has dried. If fingerprints appear on the paint film after touching it, the paint layer must be re-sanded and re-sprayed. This method has the disadvantages of being demanding and cumbersome, and the paint film still risks contamination from the operator during subsequent use. Summary of the Invention

[0005] In view of this, the present invention proposes a spraying method for improving the anti-pollution property of H61-1 silver powder paint. The method of the present invention can not only achieve the anti-pollution property of the paint film, but also is easy to operate and does not affect the protective effect of the paint film.

[0006] Specifically proposed is a spraying method for improving the anti-pollution property of H61-1 silver powder paint, which comprises the following steps:

[0007] Step 1: Paint mixing

[0008] Epoxy silicone resin and polyamide resin were weighed and mixed in a mass ratio of 100:30, and then poured into spray pots 1 and 2 respectively after filtering and left to stand for more than 1 hour. Aluminum powder was added to spray pot 1 at a mass ratio of 24 to 26 parts by mass. The viscosity of the paint in spray pot 1 was adjusted to 20 to 24 seconds for coating 4 cups by adding thinner X-7, and the viscosity of the paint in spray pot 2 was adjusted to 16 to 20 seconds for coating 4 cups by adding thinner X-7.

[0009] Step 2: Spray the paint in the spray bottle

[0010] Use the paint in a spray bottle to spray, the paint film thickness is 40um~50um;

[0011] Step 3: Spray paint in the spray bottle

[0012] Within 30 to 60 minutes after completing step 2, spray the paint in spray bottle 2 to a film thickness of 10 to 15 μm.

[0013] Step 4: Drying

[0014] After standing at room temperature for 1 hour, dry at 40°C to 60°C for more than 4 hours.

[0015] Advantageously, 25 parts by mass of aluminum powder are added to a spray bottle.

[0016] Advantageously, in step 1, the polyamide resin is slowly poured into the epoxy silicone resin while stirring.

[0017] Advantageously, the volume of the paint poured into the second spray pot in step 1 is 25% to 30% of the volume of the paint in the first spray pot.

[0018] Advantageously, in step 1, the calculated amount of aluminum powder is soaked with diluent X-7 and then added to spray pot 1 and manually stirred for 1 to 2 minutes.

[0019] Advantageously, the paint film thickness in step 2 is 45 μm.

[0020] Advantageously, the paint film thickness in step 3 is 13 μm.

[0021] Advantageously, the drying temperature in step 4 is 50°C.

[0022] Beneficial Effects: This invention utilizes two spray applications with different paint ratios, controlling the paint viscosity, time interval, and subsequent drying method, to achieve complete coating of the aluminum powder on the exterior surface of the paint film with the film-forming resin, thereby enhancing the pollution resistance of the H61-1 silver powder paint. While maintaining the original physical and chemical properties of the H61-1 paint film, this improved pollution resistance allows for easy removal of contaminated paint without causing smudging. DETAILED DESCRIPTION

[0023] The present invention achieves full coverage of aluminum powder on the surface of the paint film by film-forming resin through two sprayings of paint with different component ratios. After changing the ratio of silver powder, a silver powder paint prepared in a mass ratio of 100:30:(24-26) is first sprayed to a 40um-50um paint film. After spraying, a thin layer of 10um-15um aluminum-free paint is sprayed on the surface of the paint film, wherein the mass ratio of component one to component two is 100:30. By reducing the construction viscosity, the paint film is quickly leveled, and the drying temperature is controlled to diffuse the surface paint into the original paint film, so that the aluminum powder on the surface of the paint film is fully covered by the paint film resin, thereby improving the anti-pollution performance of the paint film. The overall ratio of each component among the three components of H61-1 paint still meets the construction specifications, and the drying of the paint film can ensure the required performance.

[0024] The specific implementation plan is as follows:

[0025] Step 1: Paint mixing

[0026] Calculate the amount of paint according to the amount of product to be sprayed, weigh the epoxy silicone resin component 1 and the polyamide resin component 2 of the H61-1 silver powder paint at a mass ratio of 100:30, slowly pour the polyamide resin component 2 into the epoxy silicone resin component 1 while stirring, and then pour them into spray pot 1 and spray pot 2 respectively after filtering, among which the volume of paint poured into spray pot 2 is 25% to 30% of the volume of paint in spray pot 1, and then let it stand for more than 1 hour.

[0027] Weigh aluminum powder in spray pot one according to a mass ratio of 100:30:(24-26) for component one epoxy silicone resin: component two polyamide resin: component three aluminum powder. Soak the calculated amount of aluminum powder in thinner X-7 and add it to spray pot one. Stir manually for 1-2 minutes, then continue adding thinner X-7 to adjust the paint viscosity to 20s-24s (apply to 4 cups). Add thinner X-7 to adjust the paint viscosity in spray pot two to 16s-20s (apply to 4 cups).

[0028] Step 2: Spray the paint in the spray bottle

[0029] Let the paint in the spray bottle with adjusted viscosity stand for 5 to 10 minutes before spraying. The paint film thickness should be 40 to 50 μm.

[0030] Step 3: Spray paint in the spray bottle

[0031] Within 30 to 60 minutes after completing step 2, manually stir the paint in the second spray bottle for 1 to 2 minutes and spray it. The paint film thickness is 10 to 15 μm.

[0032] Step 4: Drying

[0033] After standing at room temperature for 1 hour, dry at 40°C to 60°C for more than 4 hours.

[0034] If fingerprints or other stains appear on the dried paint film during transfer, wipe it with a clean, soft white cloth dampened with purified water. The thinner used in H61-1 is X-7, whose main components are xylene and butanol. Gasoline and alcohol both contain certain alcohol components, which can discolor the paint surface and therefore should not be used for wiping.

[0035] Example

[0036] A batch of 12 products is required to be sprayed with H61-1 silver powder paint. After the products are routinely cleaned and polished, the painting steps for this batch of products are as follows:

[0037] 1. According to the mass ratio of component 1 and component 2 of H61-1 silver powder paint of 100:30, slowly pour component 2 into component 1 while stirring. After filtering, pour them into two spray bottles respectively. The paint volume of spray bottle 2 is about 25% of the paint in spray bottle 1. Then let each bottle stand for 70 minutes.

[0038] 2. The amount of aluminum powder is calculated according to the mass ratio of the components in spray bottle 1. The ratio of the three components is 100:30:25. The aluminum powder is soaked and dissolved in diluent X-7 and then poured into spray bottle 1.

[0039] 3. After manually stirring the paint in spray can one for 90 seconds, use thinner X-7 to adjust the viscosity of the paint in spray can one to 23s, and the viscosity of the paint in spray can two to 18s.

[0040] 4 After the paint in the spray pot has been left to stand for 6 minutes, start spraying. The subsequent measurement of the spray thickness of the test piece sprayed at the same time is 43um.

[0041] 5. After spraying the paint in spray pot one, wait for the product to stand for 40 minutes, then start spraying the paint in spray pot two. The subsequent measurement of the spray thickness of the test piece sprayed at the same time is 11um.

[0042] 6. Place the sprayed product at room temperature (23°C) for 70 minutes, then bake in a 52°C oven for 5 hours and air cool.

[0043] After the paint film has dried, take one piece and touch it with your bare hands. If there are fingerprints on the paint film surface, wipe it off with a clean cloth dipped in a small amount of pure water. One piece of this batch of products was sampled for routine testing and passed the environmental tests such as humidity and heat, salt spray, high and low temperature.

[0044] Conclusion: The H61-1 paint film sprayed by this method has strong anti-pollution properties and can still meet the requirements of environmental tests.

[0045] The above description is merely an implementation example of the present invention and is not intended to limit the scope of protection of the present invention.

Claims

1. A spraying method for improving the anti-pollution property of H61-1 silver powder paint, characterized in that: The method comprises the following steps: Step 1: Paint mixing Epoxy silicone resin and polyamide resin were weighed and mixed in a mass ratio of 100:30, and then poured into spray pots 1 and 2 respectively after filtering and left to stand for more than 1 hour. Aluminum powder was added to spray pot 1 at a mass ratio of 24 to 26 parts by mass. The viscosity of the paint in spray pot 1 was adjusted to 20 to 24 seconds for coating 4 cups by adding thinner X-7, and the viscosity of the paint in spray pot 2 was adjusted to 16 to 20 seconds for coating 4 cups by adding thinner X-7. Step 2: Spray the paint in the spray bottle Use the paint in a spray bottle to spray, the paint film thickness is 40um~50um; Step 3: Spray paint in the spray bottle Within 30 to 60 minutes after completing step 2, spray the paint in spray bottle 2 to a film thickness of 10 to 15 μm. Step 4: Drying After standing at room temperature for 1 hour, dry at 40°C to 60°C for more than 4 hours.

2. The spraying method according to claim 1, wherein: Add 25 parts by mass of aluminum powder into a spray bottle.

3. The spraying method according to claim 1, wherein: In step 1, the polyamide resin is slowly poured into the epoxy silicone resin while stirring.

4. The spraying method according to claim 1, wherein: The volume of paint poured into spray pot 2 in step 1 is 25% to 30% of the volume of paint in spray pot 1.

5. The spraying method according to claim 1, wherein: In step 1, soak the calculated amount of aluminum powder with diluent X-7, then add it to spray pot 1 and stir it manually for 1 to 2 minutes.

6. The spraying method according to claim 1, wherein: The paint film thickness in step 2 is 45 μm.

7. The spraying method according to claim 1, wherein: The paint film thickness in step 3 is 13 μm.

8. The spraying method according to claim 1, wherein: The drying temperature in step 4 is 50°C.