TWI392771B - Surface coating processing method - Google Patents

Description

Surface coating processing method

The invention relates to a surface coating processing method.

According to the conventional electroplating and vacuum plating, some unavoidable defects, low gloss, electroplating manufacturers cause environmental damage due to pollution problems, lack of electroplating processing resources and rising plating materials, etc. The corrosion resistance and hardness of the mirror surface are somewhat lost. Because most of the weak reducing agents used in the spraying process have a long reaction time, a large amount of raw materials have to be lost, resulting in waste of raw materials and cost. The producer of problems such as slower production speed.

The above-mentioned conventional electroplating technology has a certain degree of loss in corrosion resistance and hardness, and most of the weak reductants used in the spraying process are likely to cause environmental damage.

The main object of the present invention is to provide a surface coating processing method for performing electrophoretic coating primer on the surface of a workpiece to be processed, and then performing nano-spraying, and performing electrophoretic coating on the surface after electrophoresis of nano-spraying. Paint, so that the surface of the workpiece does not contain heavy metals, environmentally friendly, thick and strong adhesion, good film adhesion and other characteristics.

In order to achieve the purpose of the foregoing disclosure, the surface coating processing method of the present invention has the surface of the workpiece to be processed having a metallic luster without causing environmental pollution, and the surface coating processing method is a neutral cleaning of the workpiece to be processed. The neutrally cleaned workpiece is subjected to pure water rinsing, and the workpiece washed by the pure water is electrophoretically coated with an electric primer to bake the workpiece of the electric primer, and the baked workpiece is subjected to baking. Nano-spraying, electrophoretic coating of the workpiece after nano-spraying is performed by electro-coating, and the workpiece is subjected to electrophoretic coating to be electrically painted, then washed with pure water, and the workpiece washed with pure water is subjected to Finally, the pure water is rinsed, and the workpiece washed by the final pure water is baked, and the workpiece is baked to be the finished product; the workpiece to be processed is sprayed with the primer after electrophoretic coating. Plating, and then electrophoretic coating to the processing method of electric topcoat, so that the surface of the workpiece does not contain heavy metals, very environmentally friendly; and has a metal mirror effect of electroplating, can also add different colors required for different color materials, beautiful And the coating film surface thickness and adhesion reached 100%, 3H to 4H pencil hardness, coating film is very good; in addition, this processing method can also be fully automatic line and manual line mass production, production yield rate Those who have increased by more than 95%.

The surface coating processing method of the invention is mainly used for surface coating of the workpiece to be processed, and the workpiece to be processed can be metal, plastic, etc.; the following steps are included:

Step 1: Neutral cleaning with ultrasonic cleaning machine for processing workpieces. Of course, other neutral cleaning can also be used, such as chemical cleaning, physical cleaning, ultrasonic cleaning, PIG cleaning, high-pressure water jet cleaning, etc.

Step 2: The workpiece after the neutral cleaning is washed with pure water by a pure water washing machine;

Step 3: electrophoretic coating the workpiece after pure water rinsing with an electrocoat, followed by a step of performing pure water rinsing;

Step 4: Baking the workpiece after the electro-priming. If it is a metal workpiece, the temperature is 160 to 180 degrees, and the baking is about 30 minutes. If it is plastic, it is cured by UV light. The light is generally 800- 1100 mJ;

Step 5; performing baking of the workpiece after baking, followed by a step of performing pure water rinsing, followed by baking, baking at a baking temperature of 65 to 100 degrees for 15 minutes;

Step 6: Electrophoretic coating of the workpiece after the nano-spraying is performed by electrocoating the topcoat to be tinted, and different colors required for different color tone adjustments may be added;

Step 7: The workpiece after the electric painting is cleaned by pure water;

Step 8: The pure water cleaning workpiece is subjected to final pure water cleaning;

Step 9: Baking the workpiece after the final pure water cleaning to complete the finished product production process.

Among them, electrophoretic coating is referred to as ED (electro-depositon), AED (anode electrophoretic coating) and CED (cathode electrophoretic coating) in English; electrophoretic coating process is accompanied by four chemistry such as electrophoresis, electrodeposition, electrolysis and electroosmosis. The combination of physical effects forms a coating film, a DC power source is used, and the metal workpiece enters the electrophoretic paint liquid. After energization, the cationic coating particles move toward the cathode workpiece, and the anionic coating particles are deposited on the anode workpiece, and then deposited on the workpiece surface. A uniform, continuous coating film is formed. When the coating film reaches a certain thickness (the coating film is large to a certain extent), the surface of the workpiece forms an insulating layer, and the "differential attraction" stops, and the electrophoretic coating process ends. The entire electrophoretic coating process can be summarized as the following four steps: electrolysis: electrolysis of water; electrophoresis: a process in which a charged polymer migrates to a cathode or an anode, respectively; electrodeposition: a process in which a charged polymer is deposited at a cathode or an anode, respectively; Electroosmosis: The deposited electrophoretic coating shrinks, removes solvent and water, forming a uniform to dense wet film. In the present embodiment, the electrophoresis uses an acrylic resin, and of course, a base acid resin and an epoxy resin may also be used.

The nano-spraying, also known as silver mirror coating or NSP mid-coating, has the following processes: firstly, the pre-stain treatment is performed, then the spray coating device sprays the reaction layer, then the pure water is washed, and finally the drying is completed; in this embodiment The nano-spraying is performed by using a conductor silver ion reaction.

The surface coating processing method of the present invention is a method for processing a top coat after electrophoresis with a primer, and then electrophoresing the top coat, so that the surface does not contain heavy metals, which is very environmentally friendly; and has a metal mirror effect of electroplating It can also add different colors required by different color materials, beautiful and generous; and the surface thickness and adhesion of the coated film reaches 100%, 3H to 4H pencil hardness, and the coating film is excellent; The method can also be mass-produced by automatic line and manual line, and the production yield rate is increased by more than 95%.

In summary, it is understood that the present invention is novel, and the present invention is not found in any publication, and is in compliance with the provisions of Articles 21 and 22 of the Patent Law.

The above description is only a preferred embodiment of the present invention, and the scope of the present invention is not limited thereto. That is, the equivalent changes and modifications made by the invention in accordance with the scope of the invention are still within the scope of the invention.

1. . . Cleaning the workpiece

2. . . Pure water rinse

3. . . Electrophoretic primer

4. . . bake

5. . . Nano-spraying

51. . . Stain treatment

52. . . Spray reaction layer

53. . . Pure water rinse

54. . . drying

6. . . Electrophoretic topcoat

7. . . Pure water rinse

8. . . Final pure water rinse

9. . . bake

10. . . Finished product

First: Schematic diagram of the surface processing flow of the present invention

Second: Schematic diagram of the nano-spraying process of the present invention

1. . . Cleaning the workpiece

2. . . Pure water rinse

3. . . Electrophoretic primer

4. . . bake

5. . . Nano-spraying

6. . . Electrophoretic topcoat

7. . . Pure water rinse

8. . . Final pure water rinse

9. . . bake

10. . . Finished product

Claims (7)

A surface coating processing method mainly for surface coating of a workpiece to be processed, characterized in that the method comprises the following steps: Step 1: Neutral cleaning of the workpiece to be processed; Step 2: Working after neutral cleaning Perform pure water rinsing; Step 3: Electrophoretic coating of the workpiece after pure water rinsing to electrocoat; Step 4: Baking the workpiece after electro-coating; Step 5: Baking the workpiece Perform nano-spraying; Step 6: Electrolytic coating of the workpiece after nano-spraying with electric topcoat; Step 7: Rinse the workpiece after the electro-painted finish with pure water; Step 8: Purify the pure water The rinsed workpiece is subjected to final pure water washing; Step 9: The final pure water washed workpiece is baked to complete the finished product production process. The surface coating processing method according to claim 1, wherein the step of performing electrophoretic coating in step three and baking in step four further comprises the step of performing pure water rinsing. The surface coating processing method according to claim 1, wherein the step of performing the pure water rinsing between the step of performing the nano-spraying in step 5 and the electrophoretic coating in the step 6. The surface coating processing method according to claim 1, wherein the step of baking is further included between the pure water rinsing step after the step 5 and the electrophoretic coating step 6. The surface coating processing method according to Item 1, wherein the neutral cleaning in the first step includes chemical cleaning, physical cleaning, ultrasonic cleaning, PIG cleaning, and high-pressure water jet cleaning. The surface coating processing method according to claim 1, wherein the nano-spraying process is: firstly, the pre-stain treatment is performed, and then the reaction layer is sprayed on the spraying equipment, followed by pure water cleaning, and finally drying. Completed. The surface coating processing method according to Item 1, wherein the top coat can be sized.